vor 3 Jahren · 1159a0ef6f
--- a/.github/ISSUE_TEMPLATE/bug_report.md
+++ b/.github/ISSUE_TEMPLATE/bug_report.md
@@ -55,7 +55,7 @@ List the platform(s) and toolsets which are applicable to the issue, and all of

 - Operating System: [e.g. macOS, Linux, Windows]
 - Compiler: [e.g. MSVC, GCC, Clang]
 - `dds` Version: [e.g. `0.1.0-alpha.5`]
 - `dds` Version: [e.g. `0.1.0-alpha.6`]

 **Additional context**

--- a/Makefile
+++ b/Makefile
@@ -28,7 +28,7 @@ docs-server: docs
 		python -m http.server 9794

 docs-watch: docs
 	+sh tools/docs-watch.sh
 	+poetry run sh tools/docs-watch.sh

 docs-sync-server:
 	mkdir -p _build/docs
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -11,16 +11,20 @@ author = 'vector-of-bool'
 # The short X.Y version
 version = ''
 # The full version, including alpha/beta/rc tags
 release = '0.1.0-alpha.5'
 release = '0.1.0-alpha.6'

 # -- General configuration ---------------------------------------------------
 extensions = []
 extensions = ['sphinx.ext.autodoc', 'sphinx.ext.intersphinx']
 templates_path = []
 source_suffix = '.rst'
 master_doc = 'index'
 language = None
 exclude_patterns = ['_build', 'Thumbs.db', '.DS_Store']
 pygments_style = None
 intersphinx_mapping = {
    'python': ('https://docs.python.org/3', None),
    'pytest': ('https://docs.pytest.org/en/latest/', None),
 }

 # -- Options for HTML output -------------------------------------------------
 html_theme = 'nature'
--- a/docs/design.rst
+++ b/docs/design.rst
@@ -3,13 +3,14 @@

 ``dds`` has been designed from the very beginning as an extremely opinionated
 hybrid *build system* and *package manager*. Unlike most build systems however,
 ``dds`` has a hyper-specific focus on a particular aspect of software
 development: C and C++ libraries.
 ``dds`` has a strong focus on a particular aspect of software development: C and
 C++ libraries.

 This may sound pointless, right? Libraries are useless unless we can use them
 to build applications!

 Indeed, applications *are* essential, but that is "not our job" with ``dds``.
 Indeed, applications *are* essential, and ``dds`` is able to build those as
 well.

 Another design decision is that ``dds`` is built to be driven by automated
 tools as well as humans. ``dds`` is not designed to entirely replace existing
@@ -32,8 +33,8 @@ incredible implementation challenges.

 Despite the vast amount of work put into build systems and tooling, virtually
 all developers are using them *incorrectly* and/or *dangerously* without
 realizing it. Despite this work, we seem to be a great distance from a unified
 library package distribution and consumption mechanism.
 realizing it, and we seem to be still a great distance from a unified library
 package distribution and consumption mechanism.


 Tabula Rasa
@@ -46,7 +47,7 @@ If you opt-in to have your library built by ``dds``, you forgoe
 *customizability* in favor of *simplicity* and *ease*.

 ``dds`` takes a look at what is needed to build and develop *libraries* and
 hyper-optimizes for that use case. It is also built with a very strong, very
 optimizes for that use case. It is also built with a very strong, very
 opinionated idea of *how* libraries should be constructed and used. These
 prescriptions are not at all arbitrary, though. They are built upon the
 observations of the strengths and weaknesses of build systems in use throughout
@@ -69,14 +70,14 @@ different, despite both using the same underlying "Build System."

 ``dds`` takes a massive divergence at this point. One project using ``dds`` as
 their build system has a nearly identical build process to every other project
 using ``dds``. Simply running :code:`dds build -t <toolchain>` should be enough
 using ``dds``. Simply running ``dds build`` should be enough
 to build *any* ``dds`` project.

 In order to reach this uniformity and simplicity, ``dds`` drops almost all
 aspects of project-by-project customizability. Instead, ``dds`` affords the
 developer a contract:

    If you play by my rules, you get to play in my space.
    If you play by the rules, you get to play in this space.


 .. _design.rules:
@@ -91,7 +92,7 @@ imposes, but what are they?
 .. _design.rules.not-apps:

 ``dds`` Is not Made for Complex Applications
 ===============================================
 ============================================

 Alright, this one isn't a "rule" as much as a recommendation: If you are
 building an application that *needs* some build process functionality that
@@ -105,22 +106,28 @@ violate any of the other existing rules.
    customization features to permit the rules to be bent arbitrarily: Read
    on.

 ``dds`` contains a minimal amount of functionality for building simple
 applications, but it is certainly not its primary purpose.
 ``dds`` *does* contain functionality for building applications, but they must
 also play by the rules.

 If you want to build a complex application with ``dds`` that uses lots of
 platform-specific sources, code generation, and conditional components, a good
 option is to use an external build script that prepares the project tree before
 invoking ``dds``.


 .. _design.rules.change:

 *Your* Code Should Be Changed Before ``dds`` Should Be Changed
 =================================================================
 *Your Code* Should Be Changed Before ``dds`` Should Be Changed
 ==============================================================

 The wording of this rule means that the onus is on the library developer to
 meet the expectations that ``dds`` prescribes in order to make the build
 work.
 The wording of this rule means that the onus is on the developer to meet the
 expectations that ``dds`` prescribes in order to make the build work.

 If your library meets all the requirements outlined in this document but you
 still find trouble in making your build work, this is grounds for change in
 ``dds``, either in clarifying the rules or tweaking ``dds`` functionality.
 If your project meets all the requirements outlined in this document but you
 still find trouble in making your build work, or if you *cannot* see *any*
 possible way for your project to be built by ``dds`` regardless of what changes
 you make, then it this is grounds for change in ``dds``, either in clarifying
 the rules or tweaking ``dds`` functionality


 .. _design.rules.layout:
@@ -154,9 +161,8 @@ conditional compilation.
 All Code Must Be in Place Before Building
 =========================================

 ``dds`` does not provide code-generation functionality. Instead, any
 generated code should be generated and committed to the repository to be only
 ever modified through such generation scripts.
 ``dds`` does not provide code-generation functionality. Instead, any generated
 code should be generated by separate build steps before ``dds`` is executed.


 .. _design.rules.one-binary-per-src:
@@ -176,7 +182,7 @@ No Arbitrary ``#include`` Directories
 =====================================

 Only ``src/`` and ``include/`` will ever be used as the basis for header
 resolution while building a library, so all ``#include`` directives should be
 resolution while building a project, so all ``#include`` directives should be
 relative to those directories. Refer to :ref:`pkg.source-root`.


@@ -185,7 +191,7 @@ relative to those directories. Refer to :ref:`pkg.source-root`.
 All Files Compile with the Same Options
 =======================================

 When DDS compiles a library, every source file will be compiled with an
 When DDS compiles a project, every source file will be compiled with an
 identical set of options. Additionally, when DDS compiles a dependency tree,
 every library in that dependency tree will be compiled with an identical set of
 options. Refer to the :doc:`guide/toolchains` page for more information.
--- a/docs/dev/building.rst
+++ b/docs/dev/building.rst
@@ -1,209 +1,133 @@
 Building ``dds`` from Source
 ############################

 While prebuilt ``dds`` executables are `available on the GitHub page
 <releases_>`_, one may wish to build ``dds`` from source.

 .. _releases: https://github.com/vector-of-bool/dds/releases

 The ``dds`` build process is designed to be as turn-key simple as possible.


 Platform Support
 ****************

 ``dds`` aims to be as cross-platform as possible. It currently build and
 executes on Windows, macOS, Linux, and FreeBSD. Support for additional
 platforms is possible but will require modifications to ``bootstrap.py`` that
 will allow it to be built on such platforms.


 Build Requirements
 ******************

 Building ``dds`` has a simple set of requirements:

 - **Python 3.6** or newer to run the bootstrap/CI scripts.
 - A C++ compiler that has rudimentary support for C++20 concepts. Newer
  releases of Visual C++ that ship with **VS 2019** will be sufficient on
  Windows, as will **GCC 9** with ``-fconcepts`` on other platforms.

 .. note::
    On Windows, you will need to execute the build from within a Visual C++
    enabled environment. This will involve launching the build from a Visual
    Studio Command Prompt.

 .. note::
    At the time of writing, C++20 Concepts has not yet been released in Clang,
    but should be available in LLVM/Clang 11 and newer.


 Build Scripts and the CI Process
 ********************************

 The main CI process is driven by Python. The root CI script is ``tools/ci.py``,
 and it accepts several command-line parameters. Only a few of are immediate
 interest:

 ``--bootstrap-with=<method>`` or ``-B <method>``
    Tell ``ci.py`` how to obtain the previous ``dds`` executable that can build
    the *current* ``dds`` source tree. This accepts one of three values:
    ``skip``, ``download``, or ``build``. Refer to :ref:`bootstrapping`.

 ``--build-only``
    A flag that tells ``ci.py`` to exit after it has successfully built the
    current source tree, and to not execute the phase-2 build nor the automated
    tests.

 ``--toolchain=<path>`` or ``-T <path>``
    Tell ``ci.py`` what toolchain to give to the prior ``dds`` to build the
    current ``dds``.

 The ``ci.py`` script performs the following actions, in order:

 #. Prepare the build output directory
 #. Prepare the prior version of ``dds`` that will build the current version.
 #. Import the embedded ``catalog.json`` into a catalog database stored within
   ``_prebuilt/``. This will be used to resolve the third-party packages that
   ``dds`` itself uses.
 #. Invoke the build of ``dds`` using the prebuilt ``dds`` from the prior
   bootstrap phase. If ``--build-only`` was specified, the CI script stops
   here.
 #. Use the new ``dds`` executable to rebuild itself *again* (phase-2 self-build
   test). A bit of a "sanity test."
 #. Execute the test suite using ``pytest``.


 .. _bootstrapping:
  This page assumes that you have ready the :doc:`env` page, and that you are
  running all commands from within the Poetry-generated virtual environment.

 Bootstrapping ``dds``
 *********************
 The main entrypoint for the ``dds`` CI process is the ``dds-ci`` command, which
 will build and test the ``dds`` from the repository sources. ``dds-ci`` accepts
 several optional command-line arguments to tweak its behavior.

 In the beginning, ``dds`` was built by a Python script that globbed the sources
 and invoked the compiler+linker on those sources. Once ``dds`` was able to
 build and link itself, this Python script was replaced instead with ``dds``
 building itself. ``dds`` has never used another build system.

 The ``ci.py`` script accepts one of three methods for the ``--bootstrap-with``
 flag: ``skip``, ``download``, or ``build``.
 Running a Build *Only*
 **********************

 Once bootstrapping is complete, a ``dds`` executable will be written to
 ``_prebuilt/dds``. This executable refers to a **previous** version of ``dds``
 that is able to build the newer ``dds`` source tree.
 If you only wish to obtain a built ``dds`` executable, the ``--no-test``
 parameter can be given::

 .. note::
    For all development work on ``dds``, the ``_prebuilt/dds`` executable should
    always be used. This means that newer ``dds`` features are not available
    for use within the ``dds`` repository.
  $ dds-ci --no-test

 This will skip the audit-build and testing phases of CI and build only the final
 ``dds`` executable.

 Bootstrap: ``skip``
 ===================

 If given ``skip``, ``ci.py`` will not perform any bootstrapping steps. It will
 assume that there is an existing ``_prebuilt/dds`` executable. This option
 should be used once bootstrapping has been performed at least once with another
 method, as this is much faster than rebuilding/redownloading every time.
 Rapid Iterations for Development
 ********************************

 If you are making frequent changes to ``dds``'s source code and want a fast
 development process, use ``--rapid``::

 Bootstrap: ``download``
 =======================
  $ dds-ci --rapid

 The ``ci.py`` script has a reference to a download URL of the prior version of
 ``dds`` that has been designated for the bootstrap. These executables originate
 from `the GitHub releases <releases_>`_ page.
 This will build the build step only, and builds an executable with maximum debug
 and audit information, including AddressSanitizer and
 UndefinedBehaviorSanitizer. This will also execute the unit tests, which should
 run completely in under two seconds (if they are slower, then it may be a bug).

 If given ``download``, then ``ci.py`` will download a predetermined ``dds``
 executable and use it to perform the remainder of the build.

 Toolchain Control
 *****************

 Bootstrap: ``build``
 ====================
 ``dds-ci`` will automatically select and build with an appropriate
 :doc:`toolchain </guide/toolchains>` based on what it detects of the host
 platform, but you may want to tweak those options.

 Another script, ``tools/bootstrap.py`` is able to build ``dds`` from the ground
 up. It works by progressively cloning previous versions of the ``dds``
 repository and using them to build the next commit in the chain.
 The ``dds-ci`` script accepts two toolchain options:

 While this is a neat trick, it isn't necessary for most development, as the
 resulting executable will be derived from the same commit as the executable
 that would be obtained using the ``download`` method. This is also more fragile
 as the past commits may make certain assumptions about the system that might
 not be true outside of the CI environment. The build process may be tweaked in
 the future to correct these assumptions.
 ``--main-toolchain``
  This is the toolchain that is used to create a final release-built executable.
  If you build with ``--no-test``, this toolchain will be used.

 ``--test-toolchain`` This is the toolchain that is used to create an auditing
 and debuggable executable of ``dds``. This is the toolchain that is used if you
 build with ``--rapid``.

 Selecting a Build Toolchain
 ***************************
 If you build with neither ``--rapid`` nor ``--no-test``, then ``dds-ci`` will
 build *two* ``dds`` executables: One with the ``--test-toolchain`` that is
 passed through the test suite, and another for ``--main-toolchain`` that is
 built for distribution.

 ``dds`` includes three toolchains that it uses to build itself in its CI
 environment: ``tools/gcc-9.jsonc`` for Linux and macOS,
 ``tools/freebsd-gcc-9.jsonc`` for FreeBSD, and ``tools/msvc.jsonc`` for
 Windows.
 The default toolchains are files contained within the ``tools/`` directory of
 the repository. When ``dds-ci`` builds ``dds``, it will print the path to the
 toolchain file that is selected for that build.

 While these toolchains will work perfectly well in CI, you may need to tweak
 these for your build setup. For example: ``gcc-9.jsonc`` assumes that the GCC 9
 executables are named ``gcc-9`` and ``g++-9``, which is incorrect on some
 Linux distributions.
 While these provided toolchains will work perfectly well in CI, you may need to
 tweak these for your build setup. For example: ``gcc-9-*.jsonc`` toolchains
 assume that the GCC 9 executables are named ``gcc-9`` and ``g++-9``, which is
 incorrect on some Unix and Linux distributions.

 It is recommended to tweak these files as necessary to get the build working on
 your system. However, do not include those tweaks in a commit unless they are
 necessary to get the build running in CI.

 your system. However, **do not** include those tweaks in a commit unless they
 are necessary to get the build running in CI.

 Giving a Toolchain to ``ci.py``
 ===============================

 Just like passing a toolchain to ``dds``, ``ci.py`` also requires a toolchain.
 Simply pass the path to your desired toolchain using the ``--toolchain``/
 ``-T`` argument:
 What's Happening?
 *****************

 .. code-block:: bash
 The ``dds-ci`` script performs the following actions, in order:

    $ python3 tools/ci.py [...] -T tools/gcc-9.jsonc
 #. If given ``--clean``, remove any prior build output and downloaded
   dependencies.
 #. Prepare the prior version of ``dds`` that will build the current version
   (usually, just download it). This is placed in ``_prebuilt/``.
 #. Import the ``old-catalog.json`` into a catalog database stored within
   ``_prebuilt/``. This will be used to resolve the third-party packages that
   ``dds`` itself uses.
 #. Invoke the build of ``dds`` using the prebuilt ``dds`` obtained from the
   prior bootstrap phase. If ``--no-test`` or ``--rapid`` was specified, the CI
   script stops here.
 #. Launch ``pytest`` with the generated ``dds`` executable and start the final
   release build simultaneously, and wait for both to finish.


 Building for Development
 ************************
 Unit Tests
 **********

 While ``ci.py`` is rigorous in maintaining a clean and reproducible environment,
 we often don't need such rigor for a rapid development iteration cycle. Instead
 we can invoke the build command directly in the same way that ``ci.py`` does
 it:
 Various pieces of ``dds`` contain unit tests. These are stored within the
 ``src/`` directory itself in ``*.test.cpp`` files. They are built and executed
 as part of the iteration cycle *unconditionally*. These tests execute in
 milliseconds so as not to burden the development iteration cycle. The more
 rigorous tests are executed separately by PyTest.

 .. code-block:: bash

    $ _prebuilt/dds build -t [toolchain] \
        --catalog _prebuilt/catalog.db \
        --repo-dir _prebuilt/ci-repo
 Speeding Up the Build
 *********************

 The ``--catalog`` and ``--repo-dir`` arguments are not strictly necessary, but
 help to isolate the ``dds`` dev environment from the user-local ``dds``
 environment. This is important if modifications are made to the catalog
 database schema that would conflict with the one of an external ``dds``
 version.
 ``dds``'s build is unfortunately demanding, but can be sped up by additional
 tools:

 .. note::
    You'll likely want to run ``ci.py`` *at least once* for it to prepare the
    necessary ``catalog.db``.

 .. note::
    As mentioned previously, if using MSVC, the above command must execute with
    the appropriate VS development environment enabled.
 Use the LLVM ``lld`` Linker
 ===========================

 Installing the LLVM ``lld`` linker will *significantly* improve the time it
 takes for ``dds`` and its unit test executables to link. ``dds-ci`` will
 automatically recognize the presence of ``lld`` if it has been installed
 properly.

 Running the Test Suite
 **********************
 .. note::

 The ``--build-only`` flag for ``ci.py`` will disable test execution. When this
 flag is omitted, ``ci.py`` will execute a self-build sanity test and then
 execute the main test suite, which is itself written as a set of ``pytest``
 tests in the ``tests/`` subdirectory.
  ``dds-ci`` (and GCC) look for an executable called ``ld.ldd`` on the
  executable PATH (no version suffix!). You may need to symlink the
  version-suffixed executable with ``ld.ldd`` in another location on PATH so
  that ``dds-ci`` (and GCC) can find it.


 Unit Tests
 ==========
 Use ``ccache``
 ==============

 Various pieces of ``dds`` contain unit tests. These are stored within the
 ``src/`` directory itself in ``*.test.cpp`` files. They are built and executed
 by the bootstrapped ``dds`` executable unconditionally. These tests execute
 in milliseconds and do not burden the development iteration cycle.
 ``dds-ci`` will also recognize ``ccache`` and add it as a compiler-launcher if
 it is installed on your PATH. This won't improve initial compilation times, but
 can make subsequent compilations significantly faster when files are unchanged.
--- a/docs/dev/ci-api.rst
+++ b/docs/dev/ci-api.rst
@@ -0,0 +1,79 @@
 DDS CI Scripts Python API
 #########################

 Types from pytest
 *****************

 These types are defined by pytest, but are used extensively within the testing
 scripts.

 .. class:: _pytest.fixtures.FixtureRequest

  .. seealso:: :class:`pytest.FixtureRequest`

 .. class:: _pytest.tmpdir.TempPathFactory

  .. seealso:: :class:`pytest.TempPathFactory`


 Test Fixtures
 *************

 The following test fixtures are defined:

 - :func:`~dds_ci.testing.fixtures.dds` - :class:`dds_ci.dds.DDSWrapper` - A
  wrapper around the ``dds`` executable under test.
 - :func:`~dds_ci.testing.fixtures.tmp_project` -
  :class:`dds_ci.testing.fixtures.Project` - Create a new empty directory to be
  used as a test project for ``dds`` to execute.
 - :func:`~dds_ci.testing.http.http_repo` -
  :class:`dds_ci.testing.http.RepoServer` - Create a new dds repository and
  spawn an HTTP server to serve it.

 Module: ``dds_ci``
 ******************

 .. automodule:: dds_ci
  :members:


 Module: ``dds_ci.dds``
 **********************

 .. automodule:: dds_ci.dds
  :members:


 Module: ``dds_ci.proc``
 ***********************

 .. automodule:: dds_ci.proc
  :members:


 Module: ``dds_ci.testing``
 **************************

 .. automodule:: dds_ci.testing
  :members:


 Module: ``dds_ci.testing.http``
 *******************************

 .. automodule:: dds_ci.testing.http
  :members:


 Module: ``dds_ci.testing.fixtures``
 ***********************************

 .. automodule:: dds_ci.testing.fixtures
  :members:


 Module: ``dds_ci.testing.error``
 ********************************

 .. automodule:: dds_ci.testing.error
  :members:
--- a/docs/dev/env.rst
+++ b/docs/dev/env.rst
@@ -0,0 +1,91 @@
 Setting Up a Build/Development Environment
 ##########################################

 While ``dds`` is able to build itself, several aspects of build infrastructure
 are controlled via Python scripts. You will need Python 3.6 or later available
 on your system to get started.


 .. _Poetry: python-poetry.org

 Getting Started with *Poetry*
 *****************************

 ``dds`` CI runs atop `Poetry`_, a Python project management tool. While designed
 for Python projects, it serves our purposes well.


 Installing Poetry
 =================

 If you do not have Poetry already installed, it can be obtained easily for most
 any platform.
 `Refer to the Poetry "Installation" documentation to learn how to get Poetry on your platform <https://python-poetry.org/docs/#installation>`_.

 The remainder of this documentation will assume you are able to execute
 ``poetry`` on your command-line.


 Setting Up the Environment
 ==========================

 To set up the scripts and Python dependencies required for CI and development,
 simply execute the following command from within the root directory of the
 project::

  $ poetry install

 Poetry will then create a Python virtual environment that contains the Python
 scripts and tools required for building and developing ``dds``.

 The Python virtual environment that Poetry created can be inspected using
 ``poetry env info``, and can be deleted from the system using
 ``poetry env remove``. Refer to
 `the Poetry documentation <https://python-poetry.org/docs>`_ for more
 information about using Poetry.


 Using the Poetry Environment
 ****************************

 Once the ``poetry install`` command has been executed, you will now be ready to
 run the ``dds`` CI scripts and tools.

 The scripts are installed into the virtual environment, and need not be globally
 installed anywhere else on the system. You can only access these scripts by
 going through Poetry. To run any individual command within the virtual
 environment, use ``poetry run``::

  $ poetry run <some-command>

 This will load the virtual environment, execute ``<some-command>``, then exit
 the environment. This is useful for running CI scripts from outside of the
 virtualenv.

 **Alternatively**, the environment can be loaded persistently into a shell
 session by using ``poetry shell``::

  $ poetry shell

 This will spawn a new interactive shell process with the virtual environment
 loaded, and you can now run any CI or development script without needing to
 prefix them with ``poetry run``.

 Going forward, the documentation will assume you have the environment loaded
 as-if by ``poetry shell``, but any ``dds``-CI-specific command can also be
 executed by prefixing the command with ``poetry run``.


 Working With an MSVC Environment in VSCode
 ==========================================

 If you use Visual Studio Code as your editor and MSVC as your C++ toolchain,
 you'll need to load the MSVC environment as part of your build task. ``dds`` CI
 has a script designed for this purpose. To use it, first load up a shell within
 the Visual C++ environment, then, from within the previously create Poetry
 environment, run ``gen-msvs-vsc-task``. This program will emit a Visual Studio
 Code JSON build task that builds ``dds`` and also contains the environment
 variables required for the MSVC toolchain to compile and link programs. You can
 save this JSON task into ``.vscode/tasks.json`` to use as your primary build
 task while hacking on ``dds``.

--- a/docs/dev/index.rst
+++ b/docs/dev/index.rst
@@ -1,9 +1,20 @@
 ``dds`` Development
 ###################

 While prebuilt ``dds`` executables are `available on the GitHub page
 <releases>`_, one may wish to build ``dds`` from source.

 .. _releases: https://github.com/vector-of-bool/dds/releases

 The ``dds`` build process is designed to be as turn-key simple as possible.

 This section will discuss how to modify and build ``dds`` itself.

 .. toctree::
    :maxdepth: 2

    building
    reqs
    env
    building
    testing
    ci-api
--- a/docs/dev/reqs.rst
+++ b/docs/dev/reqs.rst
@@ -0,0 +1,29 @@
 Supported Platforms and Build Requirements
 ##########################################

 ``dds`` aims to be as cross-platform as possible. It currently build and
 executes on **Windows**, **macOS**, **Linux**, and **FreeBSD**. Support for
 additional platforms is possible but will require modifications to
 ``bootstrap.py`` that will allow it to be built on such platforms.


 Build Requirements
 ******************

 Building ``dds`` has a simple set of requirements:

 - **Python 3.6** or newer to run the bootstrap/CI scripts.
 - A C++ compiler that has rudimentary support for several C++20 features,
  including Concepts. Newer releases of Visual C++ that ship with **VS
  2019** will be sufficient on Windows, as will **GCC 9** with ``-fconcepts`` on
  other platforms.

 .. note::
    On Windows, you will need to execute the build from within a Visual C++
    enabled environment. This may involve launching the build from a Visual
    Studio Command Prompt.

 .. note::
    At the time of writing, C++20 Concepts has not yet been released in Clang,
    but should be available in LLVM/Clang 11 and newer.

--- a/docs/dev/testing.rst
+++ b/docs/dev/testing.rst
@@ -0,0 +1,74 @@
 Testing with ``pytest``
 #######################

 For ``dds``'s more rigorous test suite, we use the ``pytest`` testing framework.
 These tests are stored in the ``tests/`` directory and written in ``test_*.py``
 files.

 The test suite can be run separately without ``dds-ci`` by executing ``pytest``
 from within the :doc:`Poetry virtual environment <env>`::

  $ pytest tests/

 Note that individual tests can take between a few seconds and a few minutes to
 execute, so it may be useful to execute only a subset of the tests based on the
 functionality you want to test. Refer to
 `the pytest documentation <https://docs.pytest.org/en/latest/>` for more
 information about using and executing ``pytest``. If you are running the full
 test suite, you may also want to pass the ``-n`` argument with a number of
 parallel jobs to execute.


 .. highlight:: python

 Writing Tests
 *************

 If a particular aspect of ``dds`` can be tested in isolation and within a few
 dozen milliseconds, you should prefer to test it as a unit test in a
 ``*.test.cpp`` file. The ``pytest`` tests are intended to perform full
 end-to-end feature and error handling tests.

 Tests are grouped into individual Python files in the ``tests/`` directory. Any
 Python file containing tests must have a filename beginning with ``test_``.
 Individual test functions should begin with ``test_``. All test functions should
 be properly type-annotated and successfully check via ``mypy``.

 The ``dds`` test suite has access to a set of test fixtures that can be used
 throughout tests to perform complex setup and teardown for complete test-by-test
 isolation.

 Here is a simple test that simple executes ``dds`` with ``--help``::

  def test_get_help(dds: DDSWrapper) -> None:
      dds.run(['--help'])

 In this test function, :func:`the dds object is a test fixture
 <dds_ci.testing.fixtures.dds>` that wraps the ``dds`` executable under test.


 Testing Error Handling
 **********************

 It is important that ``dds`` handle errors correctly, of course, including user
 error. It is not simply enough to check that a certain operation fails: We must
 be sure that it fails *correctly*. To check that the correct code path is
 executed, ``dds`` can write a file containing a simple constant string
 designating the error handling path that was taken. The file will be written to
 the path indicated by the ``DDS_WRITE_ERROR_MARKER`` environment variable.

 For examples of these error strings, search for usage of ``write_error_marker``
 in the ``dds`` source code. These should only execute within error-handling
 contexts, should appear near the log messages that issue diagnostics, and should
 be specific to the error at hand.

 To write a test that checks for a given error-handling path, use the
 :func:`~dds_ci.testing.error.expect_error_marker` context manager function::

  def test_sdist_invalid_project(tmp_project: Project) -> None:
    # Trying to create a package archive from a project without a
    # package.json5 is invalid. Check that it creates the correct
    # error-message string
    with error.expect_error_marker('no-package-json5'):
      tmp_project.pkg_create()

--- a/docs/err/git-url-ref-mutual-req.rst
+++ b/docs/err/git-url-ref-mutual-req.rst
@@ -12,4 +12,4 @@ as the ``ref`` requires support from the remote Git server, and it is often
 unavailable in most setups). Using a Git tag is strongly recommended.

 .. seealso::
    Refer to the documentation on :doc:`/guide/catalog`.
    Refer to the documentation on :doc:`/guide/remote-pkgs`.
--- a/docs/err/invalid-catalog-json.rst
+++ b/docs/err/invalid-catalog-json.rst
@@ -1,9 +0,0 @@
 Error: Invalid catalog JSON
 ###########################

 This error occurs when the JSON data given to import into the package catalog
 is in some way invalid. Refer to the catalog documentation for a description of
 the proper JSON format.

 .. seealso::
    :ref:`catalog.adding`
--- a/docs/err/invalid-repo-transform.rst
+++ b/docs/err/invalid-repo-transform.rst
@@ -1,10 +0,0 @@
 Error: A repository filesystem transformation is invalid
 ########################################################

 In ``dds``, a catalog entry can have a list of attached "transforms" that will
 be applies to the root directory of the package before ``dds`` tries to build
 and use it.

 .. seealso::
    For information on the shape and purpose of transforms, refer to
    :ref:`catalog.fs-transform` on the :doc:`/guide/catalog` page.
--- a/docs/err/no-catalog-remote-info.rst
+++ b/docs/err/no-catalog-remote-info.rst
@@ -6,5 +6,3 @@ requires some information regarding how to actually *acquire* that package
 when it is requested.

 If such information is not provided, ``dds`` will issue an error.

 .. seealso:: :ref:`catalog.adding`.
--- a/docs/err/no-such-catalog-package.rst
+++ b/docs/err/no-such-catalog-package.rst
@@ -8,10 +8,3 @@ in the catalog.
 It is possible that the intended package *does exist* but that the spelling of
 the package name or version number is incorrect. Firstly, check your spelling
 and that the version number you have requested is correct.

 In another case, it is possible that the package *exists somewhere*, but has
 not been loaded into the local catalog. As of this writing, ``dds`` does not
 automatically maintain the catalog against a central package repository, so
 package entries must be loaded and imported manually. If you believe this to be
 the case, refer to the section on the :doc:`/guide/catalog`, especially the
 section :ref:`catalog.adding`.
--- a/docs/err/sdist-exists.rst
+++ b/docs/err/sdist-exists.rst
@@ -19,7 +19,7 @@ write a source distribution to the named path, it would be required to delete
 whatever exists there before creating the source distribution.

 .. warning::
    When using ``dds sdist create`` with the ``--out <path>`` parameter, the
    When using ``dds pkg create`` with the ``--out <path>`` parameter, the
    ``<path>`` given **is not the directory in which to place the source
    distribution, but the filepath to the source distribution itself**!

@@ -27,7 +27,7 @@ whatever exists there before creating the source distribution.
    distribution in that directory, **the following command is incorrect**::

        # Do not do this:
        dds sdist create --out foo/
        dds pkg create --out foo/

    If you pass ``--replace`` to the above command, ``dds`` will **destroy the
    existing directory** and replace it with the source distribution!
@@ -35,4 +35,4 @@ whatever exists there before creating the source distribution.
    You **must** provide the full path to the source distribution::

        # Do this:
        dds sdist create --out foo/my-project.dsd
        dds pkg create --out foo/my-project.tar.gz
--- a/docs/guide/build-deps.rst
+++ b/docs/guide/build-deps.rst
@@ -0,0 +1,187 @@
 Building and Using ``dds`` in Another Build System
 ##################################################

 One of ``dds``'s primary goals is to inter-operate with other build systems
 cleanly. One of ``dds``'s primary outputs is *libman* package indices. These
 package indices can be imported into other build systems that support the
 `libman`_ format. (At the time of writing there is a CMake module which can do
 the import, but other build systems are planned.)

 .. _libman: https://api.csswg.org/bikeshed/?force=1&url=https://raw.githubusercontent.com/vector-of-bool/libman/develop/data/spec.bs

 .. _PMM: https://github.com/vector-of-bool/PMM

 .. _CMakeCM: https://github.com/vector-of-bool/CMakeCM

 .. _lm-cmake: https://raw.githubusercontent.com/vector-of-bool/libman/develop/cmake/libman.cmake


 .. _build-deps.gen-libman:

 Generating a libman Index
 *************************

 Importing libman packages into a build system requires that we have a libman
 index generated on the filesystem. **This index is not generated globally**: It
 is generated on a per-build basis as part of the build setup. The index will
 describe in build-system-agnostic terms how to include a set of packages and
 libraries as part of a build.

 ``dds`` has first-class support for generating this index. The ``build-deps``
 subcommand of ``dds`` will download and build a set of dependencies, and places
 an ``INDEX.lmi`` file that can be used to import the built results.


 Declaring Dependencies
 ======================

 ``dds build-deps`` accepts a list of dependency statements as command line
 arguments, but it may be useful to specify those requirements in a file.

 ``dds build-deps`` accepts a JSON5 file describing the dependencies of a
 project as well. This file is similar to a very stripped-down version of a
 ``dds`` :ref:`package manifest <pkgs.pkgs>`, and only includes the ``depends``
 key. (The presence of any other key is an error.)

 Here is a simple dependencies file that declares a single requirement:

 .. code-block:: js
  :caption: ``dependencies.json5``

  {
    depends: [
      'neo-sqlite3^0.2.0',
    ]
  }


 Building Dependencies and the Index
 ===================================

 We can invoke ``dds build-deps`` and give it the path to this file:

 .. code-block:: bash

  $ dds build-deps --deps-file dependencies.json5

 When finished, ``dds`` will write the build results into a subdirectory called
 ``_deps`` and generate a file named ``INDEX.lmi``. This file is ready to be
 imported into any build system that can understand libman files.

 .. note::
  The output directory and index filepath can be controlled with the
  ``--out`` and ``--lmi-path`` flags, respectively.


 Importing an Index: CMake
 *************************

 .. highlight:: cmake

 .. note::

  This section discusses how to import ``INDEX.lmi`` into CMake, but ``dds``
  also has built-in support for generating a CMake targets file. See
  :doc:`/howto/cmake` and :doc:`cmake` for even simpler integration steps.

 Supposed that we've generated a libman index and set of packages, and we want to
 import them into CMake. CMake doesn't know how to do this natively, but there
 exists a single-file module for CMake that allows CMake to import libraries from
 libman indices without any additional work.

 The module is not shipped with CMake, but is available online as a single
 stand-alone file. The `libman.cmake <lm-cmake_>`_ file can be downloaded and
 added to a project directly, or it can be obtained automatically through a
 CMake tool like `PMM`_ (recommended).


 Getting ``libman.cmake`` via PMM
 ================================

 Refer to the ``README.md`` file in `the PMM repo <PMM_>`_ for information on how
 to get PMM into your CMake project. In short, download and place the
 ``pmm.cmake`` file in your repository, and ``include()`` the file near the top
 of your ``CMakeLists.txt``::

  include(pmm.cmake)

 Once it has been included, you can call the ``pmm()`` function. To obtain
 *libman*, we need to start by enabling `CMakeCM`_::

  pmm(CMakeCM ROLLING)

 .. warning::
  It is not recommended to use the ``ROLLING`` mode, but it is the easiest to
  use when getting started. For reproducible and reliable builds, you should
  pin your CMakeCM version using the ``FROM <url>`` argument.

 Enabling CMakeCM will make available all of the CMake modules available in `the
 CMakeCM repository <CMakeCM_>`_, which includes `libman.cmake <lm-cmake_>`_.

 After the call to ``pmm()``, simply ``include()`` the ``libman`` module::

  include(libman)

 That's it! The only function from the module that we will care about for now
 is the ``import_packages()`` function.


 Importing Our Dependencies' Packages
 ====================================

 To import a package from a libman tree, we need only know the *name* of the
 package we wish to import. In our example case above, we depend on
 ``neo-sqlite3``, so we simply call the libman-CMake function
 ``import_packages()`` with that package name::

  import_packages("neo-sqlite3")

 You'll note that we don't request any particular version of the package: All
 versioning resolution is handled by ``dds``. You'll also note that we don't
 need to specify our transitive dependencies: This is handled by the libman
 index that was generated by ``dds``: It will automatically ``import_packages()``
 any of the transitive dependencies required.

 More than one package name can be provided to a single call to
 ``import_packages()``, and ``import_packages()`` may be called multiple times
 within a CMake project.


 Using Our Dependencies' Libraries
 =================================

 Like with ``dds``, CMake wants us to explicitly declare how our build targets
 *use* other libraries. When we import a package from a libman index, the
 import will generate CMake ``IMPORTED`` targets that can be linked against.

 In ``dds`` and in libman, a library is identified by a combination of
 *namespace* and *name*, joined together with a slash ``/`` character. This
 *qualified name* of a library is decided by the original package author, and
 should be documented. In the case of ``neo-sqlite3``, the only library is
 ``neo/sqlite3``.

 When the libman CMake module imports a library, it creates a qualified name
 using a double-colon "``::``" instead of a slash. As such, our ``neo/sqlite3``
 is imported in CMake as ``neo::sqlite3``. We can link against it as we would
 with any other target::

  add_executable(my-application app.cpp)
  target_link_libraries(my-application PRIVATE neo::sqlite3)

 Altogether, here is the final CMake file:

 .. code-block::
  :caption: ``CMakeLists.txt``
  :linenos:

  cmake_minimum_required(VERSION 3.15)
  project(MyApplication VERSION 1.0.0)

  include(pmm.cmake)
  pmm(CMakeCM ROLLING)

  include(libman)
  import_packages("neo-sqlite3")

  add_executable(my-application app.cpp)
  target_link_libraries(my-application PRIVATE neo::sqlite3)
--- a/docs/guide/catalog.rst
+++ b/docs/guide/catalog.rst
@@ -1,286 +0,0 @@
 The Package Catalog
 ###################

 ``dds`` stores a catalog of available packages, along with their dependency
 statements and information about how a source distribution thereof may be
 maintained.


 Viewing Catalog Contents
 ************************

 The default catalog database is stored in a user-local location, and the
 package IDs available can be listed with ``dds catalog list``. This will only
 list the IDs of the packages, but none of the additional metadata about them.


 .. _catalog.adding:

 Adding Packages to the Catalog
 ******************************

 The ``dds catalog import`` supports a ``--json`` flag that specifies a JSON5
 file from which catalog entries will be generated.

 .. note::
    The ``--json`` flag can be passed more than once to import multiple JSON
    files at once.

 The JSON file has the following structure:

 .. code-block:: javascript

  {
    // Import version spec.
    version: 1,
    // Packages section
    packages: {
      // Subkeys are package names
      "acme-gadgets": {
        // Keys within the package names are the versions that are
        // available for each package.
        "0.4.2": {
          // `depends` is an array of dependency statements for this
          // particular version of the package. (Optional)
          depends: [
            "acme-widgets^1.4.1"
          ],
          // `description` is an attribute to give a string to describe
          // the package. (Optional)
          description: "A collection of useful gadgets.",
          // Specify the Git remote information
          git: {
            // `url` and `ref` are required.
            url: "http://example.com/git/repo/acme-gadgets.git",
            ref: "v0.4.2-stable",
            // The `auto-lib` is optional, to specify an automatic
            // library name/namespace pair to generate for the
            // root library
            "auto-lib": "Acme/Gadgets",
            // List of filesystem transformations to apply to the repository
            // (optional)
            transform: [
              // ... (see below) ...
            ]
          }
        }
      }
    }
  }


 .. _catalog.fs-transform:

 Filesystem Transformations
 **************************

 .. note::
  Filesystem transformations is a transitional feature that is likely to be
  removed in a future release, and replaced with a more robust system when
  ``dds`` has a better way to download packages. Its aim is to allow ``dds``
  projects to use existing libraries that might not meet the layout
  requirements that ``dds`` imposes, but can otherwise be consumed by ``dds``
  with a few tweaks.

 A catalog entry can have a set of filesystem transformations attached to its
 remote information (e.g. the ``git`` property). When ``dds`` is obtaining a
 copy of the code for the package, it will apply the associated transformations
 to the filesystem based in the directory of the downloaded/cloned directory. In
 this way, ``dds`` can effectively "patch" the filesystem structure of a project
 arbitrarily. This allows many software projects to be imported into ``dds``
 without needing to patch/fork the original project to support the required
 filesystem structure.

 .. important::
  While ``dds`` allows you to patch directories downloaded via the catalog, a
  native ``dds`` project must still follow the layout rules.

  The intention of filesystem transformations is to act as a "bridge" that will allow ``dds`` projects to more easily utilize existing libraries.


 Available Transformations
 =========================

 At time of writing, there are five transformations available to catalog entries:

 ``copy`` and ``move``
  Copies or moves a set of files/directories from one location to another. Allows the following options:

  - ``from`` - The path from which to copy/move. **Required**
  - ``to`` - The destination path for the copy/move. **Required**
  - ``include`` - A list of globbing expressions for files to copy/move. If
    omitted, then all files will be included.
  - ``exclude`` - A list of globbing expressions of files to exclude from the
    copy/move. If omitted, then no files will be excluded. **If both** ``include`` and ``exclude`` are provided, ``include`` will be checked *before* ``exclude``.
  - ``strip-components`` - A positive integer (or zero, the default). When the
    ``from`` path identifies a directory, its contents will be copied/moved
    into the destination and maintain their relative path from the source path as their relative path within the destination. If ``strip-components`` is set to an integer ``N``, then the first ``N`` path components of that relative path will be removed when copying/moving the files in a directory. If a file's relative path has less than ``N`` components, then that file will be excluded from the ``copy/move`` operation.

 ``remove``
  Delete files and directories from the package source. Has the following options:

  - ``path`` - The path of the file/directory to remove. **Required**
  - ``only-matching`` - A list of globbing expressions for files to remove. If omitted and the path is a directory, then the entire directory will be deleted. If at least one pattern is provided, then directories will be left intact and only non-directory files will be removed. If ``path`` names a non-directory file, then this option has no effect.

 ``write``
  Write the contents of a string to a file in the package source. Has the following options:

  - ``path`` - The path of the file to write. **Required**
  - ``content`` - A string that will be written to the file. **Required**

  If the file exists and is not a directory, the file will be replaced. If the
  path names an existing directory, an error will be generated.

 ``edit``
  Modifies the contents of the files in the package.

  - ``path`` - Path to the file to edit. **Required**
  - ``edits`` - An array of edit objects, applied in order, with the following
    keys:

    - ``kind`` - One of ``insert`` or ``delete`` to insert/delete lines,
      respectively. **Required**
    - ``line`` - The line at which to perform the insert/delete. The first line
      of the file is line one, *not* line zero. **Required**
    - ``content`` - For ``insert``, the string content to insert into the file.
      A newline will be appended after the content has been inserted.

 Transformations are added as a JSON array to the JSON object that specifies
 the remote information for the package. Each element of the array is an
 object, with one or more of the keys listed above. If an object features more
 than one of the above keys, they are applied in the same order as they have
 been listed.


 Example: Crypto++
 =================

 The following catalog entry will build and import `Crypto++`_ for use by a
 ``dds`` project. This uses the unmodified Crypto++ repository, which ``dds``
 doesn't know how to build immediately. With some simple moving of files, we
 end up with something ``dds`` can build directly:

 .. code-block:: javascript

  "cryptopp": {
    "8.2.0": {
      "git": {
        "url": "https://github.com/weidai11/cryptopp.git",
        "ref": "CRYPTOPP_8_2_0",
        "auto-lib": "cryptopp/cryptopp",
        "transform": [
          {
            // Crypto++ has no source directories at all, and everything lives
            // at the top level. No good for dds.
            //
            // Clients are expected to #include files with a `cryptopp/` prefix,
            // so we need to move the files around so that they match the
            // expected layout:
            "move": {
              // Move from the root of the repo:
              "from": ".",
              // Move files *into* `src/cryptopp`
              "to": "src/cryptopp",
              // Only move the C++ sources and headers:
              "include": [
                "*.c",
                "*.cpp",
                "*.h"
              ]
            }
          }
        ]
      }
    }
  }


 Example: libsodium
 ==================

 For example, this catalog entry will build and import `libsodium`_ for use in
 a ``dds`` project. This uses the upstream libsodium repository, which does not
 meet the layout requirements needed by ``dds``. With a few simple
 transformations, we can allow ``dds`` to build and consume libsodium
 successfully:

 .. code-block:: javascript

  "libsodium": {
    "1.0.18": {
      "git": {
        "url": "https://github.com/jedisct1/libsodium.git",
        "ref": "1.0.18",
        "auto-lib": "sodium/sodium",
        /// Make libsodium look as dds expects of a project.
        "transform": [
          // libsodium has a `src` directory, but it does not look how dds
          // expects it to. The public `#include` root of libsodium lives in
          // a nested subdirectory of `src/`
          {
            "move": {
              // Move the public header root out from that nested subdirectory
              "from": "src/libsodium/include",
              // Put it at `include/` in the top-level
              "to": "include/"
            }
          },
          // libsodium has some files whose contents are generated by a
          // configure script. For demonstration purposes, we don't need most
          // of them, and we can just swipe an existing pre-configured file
          // that is already in the source repository and put it into the
          // public header root.
          {
            "copy": {
              // Generated version header committed to the repository:
              "from": "builds/msvc/version.h",
              // Put it where the configure script would put it:
              "to": "include/sodium/version.h"
            }
          },
          // The subdirectory `src/libsodium/` is no good. It now acts as an
          // unnecessary layer of indirection. We want `src/` to be the root.
          // We can just "lift" the subdirectory:
          {
            // Up we go:
            "move": {
              "from": "src/libsodium",
              "to": "src/"
            },
            // Delete the now-unused subdirectory:
            "remove": {
              "path": "src/libsodium"
            }
          },
          // Lastly, libsodium's source files expect to resolve their header
          // paths differently than they expect of their clients (Bad!!!).
          // Fortunately, we can do a hack to allow the files in `src/` to
          // resolve its headers. The source files use #include as if the
          // header root was `include/sodium/`, rather than `include/`.
          // To work around this, generate a copy of each header file in the
          // source root, but remove the leading path element.
          // Because we have a separate `include/` and `src/` directory, dds
          // will only expose the `include/` directory to clients, and the
          // header copies in `src/` are not externally visible.
          //
          // For example, the `include/sodium/version.h` file is visible to
          // clients as `sodium/version.h`, but libsodium itself tries to
          // include it as `version.h` within its source files. When we copy
          // from `include/`, we grab the relative path to `sodium/version.h`,
          // strip the leading components to get `version.h`, and then join that
          // path with the `to` path to generate the full destination at
          // `src/version.h`
          {
            "copy": {
              "from": "include/",
              "to": "src/",
              "strip-components": 1
            }
          }
        ]
      }
    }
  }

 .. _libsodium: https://doc.libsodium.org/
 .. _Crypto++: https://cryptopp.com/
--- a/docs/guide/cmake.rst
+++ b/docs/guide/cmake.rst
@@ -1,240 +1,82 @@
 .. highlight:: cmake

 Using ``dds`` Packages in a CMake Project
 #########################################
 Using ``dds`` in a CMake Project
 ################################

 One of ``dds``'s primary goals is to inter-operate with other build systems
 cleanly. One of ``dds``'s primary outputs is *libman* package indices. These
 package indices can be imported into other build systems that support the
 *libman* format.
 cleanly. Because of CMakes ubiquity, ``dds`` includes built-in support for
 emitting files that can be imported into CMake.

 .. note::
    ``dds`` doesn't (yet) have a ready-made central repository of packages that
    can be downloaded. You'll need to populate the local package catalog
    appropriately. The default catalog file contains a limited set of useful
    packages, but you may wish to add more for yourself.
 .. seealso::

    .. seealso:: Refer to :doc:`catalog` for information about remote packages.
  Before reading this page, be sure to read the :ref:`build-deps.gen-libman`
  section of the :doc:`build-deps` page, which will discuss how to use the
  ``dds build-deps`` subcommand.

 .. _PMM: https://github.com/vector-of-bool/PMM

 .. _CMakeCM: https://github.com/vector-of-bool/CMakeCM

 .. _lm-cmake: https://raw.githubusercontent.com/vector-of-bool/libman/develop/cmake/libman.cmake


 Generating a libman Index
 *************************

 Importing libman packages into a build system requires that we have a libman
 index generated on the filesystem. **This index is not generated globally**: It
 is generated on a per-build basis as part of the build setup. The index will
 describe in build-system-agnostic terms how to include a set of packages and
 libraries as part of a build.

 ``dds`` has first-class support for generating this index. The ``build-deps``
 subcommand of ``dds`` will download and build a set of dependencies, and places
 an ``INDEX.lmi`` file that can be used to import the built results.
 .. seealso::

  This page presents an involved and detailed process for importing
  dependencies, but there's also an *easy mode* for a one-line solution. See:
  :doc:`/howto/cmake`.

 Declaring Dependencies
 ======================

 ``dds build-deps`` accepts a list of dependency statements as commnad line
 arguments, but it may be useful to specify those requirements in a file.

 ``dds build-deps`` accepts a JSON5 file describing the dependencies of a
 project as well. This file is similar to a very stripped-down version of a
 ``dds`` :ref:`package manifest <pkgs.pkgs>`, and only includes the ``depends``
 key. (The presence of any other key is an error.)

 Here is a simple dependencies file that declares a single requirement:

 .. code-block:: js
    :caption: ``dependencies.json5``

    {
        depends: [
            'neo-sqlite3^0.2.0',
        ]
    }
 .. _PMM: https://github.com/vector-of-bool/PMM


 Building Dependencies and the Index
 ===================================
 Generating a CMake Import File
 ******************************

 We can invoke ``dds build-deps`` and give it the path to this file:
 ``build-deps`` accepts an ``--lmi-path`` argument, but also accepts a
 ``--cmake=<path>`` argument that serves a similar purpose: It will write a CMake
 file to ``<path>`` that can be ``include()``'d into a CMake project:

 .. code-block:: bash

    $ dds build-deps --deps dependencies.json5

 When finished, ``dds`` will write the build results into a subdirectory called
 ``_deps`` and generate a file named ``INDEX.lmi``. This file is ready to be
 imported into any build system that can understand libman files (in our case,
 CMake).

 .. note::
    The output directory and index filepath can be controlled with the
    ``--out`` and ``--lmi-path`` flags, respectively.


 Importing into CMake
 ********************

 We've generated a libman index and set of packages, and we want to import
 them into CMake. CMake doesn't know how to do this natively, but there exists a
 single-file module for CMake that allows CMake to import libraries from libman
 indices without any additional work.

 The module is not shipped with CMake, but is available online as a single
 stand-alone file. The `libman.cmake <lm-cmake_>`_ file can be downloaded and
 added to a project directly, or it can be obtained automatically through a
 CMake tool like `PMM`_ (recommended).


 Enabling *libman* Support in CMake via PMM
 ==========================================

 Refer to the ``README.md`` file in `the PMM repo <PMM_>`_ for information on how
 to get PMM into your CMake project. In short, download and place the
 ``pmm.cmake`` file in your repository, and ``include()`` the file near the top
 of your ``CMakeLists.txt``::

    include(pmm.cmake)

 Once it has been included, you can call the ``pmm()`` function. To obtain
 *libman*, we need to start by enabling `CMakeCM`_::

    pmm(CMakeCM ROLLING)
  $ dds build-deps "neo-sqlite3^0.2.0" --cmake=deps.cmake

 .. warning::
    It is not recommended to use the ``ROLLING`` mode, but it is the easiest to
    use when getting started. For reproducible and reliable builds, you should
    pin your CMakeCM version using the ``FROM <url>`` argument.
 This will write a file ``./deps.cmake`` that we can ``include()`` from a CMake
 project, which will then expose the ``neo-sqlite3`` package as a set of imported
 targets.

 Enabling CMakeCM will make available all of the CMake modules available in `the
 CMakeCM repository <CMakeCM_>`_, which includes `libman.cmake <lm-cmake_>`_.

 After the call to ``pmm()``, simply ``include()`` the ``libman`` module::
 Using the CMake Import File
 ===========================

    include(libman)
 Once we have generated the CMake import file using ``dds build-deps``, we can
 simply import it in our ``CMakeLists.txt``::

 That's it! The only function from the module that we will care about for now
 is the ``import_packages()`` function.


 Importing Our Dependencies' Packages
 ====================================

 To import a package from a libman tree, we need only know the *name* of the
 package we wish to import. In our example case above, we depend on
 ``neo-sqlite3``, so we simply call the libman-CMake function
 ``import_packages()`` with that package name::

    import_packages("neo-sqlite3")

 You'll note that we don't request any particular version of the package: All
 versioning resolution is handled by ``dds``. You'll also note that we don't
 need to specify our transitive dependencies: This is handled by the libman
 index that was generated by ``dds``: It will automatically ``import_packages()``
 any of the transitive dependencies required.


 Using Our Dependencies' Libraries
 =================================
  include(deps.cmake)

 Like with ``dds``, CMake wants us to explicitly declare how our build targets
 *use* other libraries. When we import a package from a libman index, the
 import will generate CMake ``IMPORTED`` targets that can be linked against.
 *use* other libraries. When we ``include()`` the generated CMake file, it will
 generate ``IMPORTED`` targets that can be linked against.

 In ``dds`` and in libman, a library is identified by a combination of
 In ``dds`` (and in libman), a library is identified by a combination of
 *namespace* and *name*, joined together with a slash ``/`` character. This
 *qualified name* of a library is decided by the original package author, and
 should be documented. In the case of ``neo-sqlite3``, the only target is
 should be documented. In the case of ``neo-sqlite3``, the only library is
 ``neo/sqlite3``.

 When the libman CMake module imports a library, it creates a qualified name
 When the generated import file imports a library, it creates a qualified name
 using a double-colon "``::``" instead of a slash. As such, our ``neo/sqlite3``
 is imported in CMake as ``neo::sqlite3``. We can link against it as we would
 with any other target::

    add_executable(my-application app.cpp)
    target_link_libraries(my-application PRIVATE neo::sqlite3)

 Altogether, here is the final CMake file:

 .. code-block::
    :caption: ``CMakeLists.txt``
    :linenos:

    cmake_minimum_required(VERSION 3.15)
    project(MyApplication VERSION 1.0.0)

    include(pmm.cmake)
    pmm(CMakeCM ROLLING)

    include(libman)
    import_packages("neo-sqlite3")

    add_executable(my-application app.cpp)
    target_link_libraries(my-application PRIVATE neo::sqlite3)


 Additional PMM Support
 **********************

 The ``pmm()`` function also supports ``dds`` directly, similar to ``CMakeCM``
 mode. This will automatically download a prebuilt ``dds`` for the host platform
 and invoke ``dds build-deps`` in a single pass as part of CMake's configure
 process. This is especially useful for a CI environment where you want to have
 a stable ``dds`` version and always have your dependencies obtained
 just-in-time.

 To start, pass the ``DDS`` argument to ``pmm()`` to use it::

    pmm(DDS)

 .. note::
    The ``_deps`` directory and ``INDEX.lmi`` file will be placed in the CMake
    build directory, out of the way of the rest of the project.

 .. note::
    The version of ``dds`` that PMM downloads depends on the version of PMM
    that is in use.

 This alone won't do anything useful, because you'll need to tell it what
 dependencies we want to install::

    pmm(DDS DEP_FILES dependencies.json5)

 You can also list your dependencies as an inline string in your CMakeLists.txt
 instead of a separate file::

    pmm(DDS DEPENDS neo-sqlite3^0.2.2)

 Since you'll probably want to be using ``libman.cmake`` at the same time, the
 calls for ``CMakeCM`` and ``DDS`` can simply be combined. This is how our new
 CMake project might look:
  add_executable(my-application app.cpp)
  target_link_libraries(my-application PRIVATE neo::sqlite3)

 .. code-block::
    :caption: ``CMakeLists.txt``
    :linenos:

    cmake_minimum_required(VERSION 3.15)
    project(MyApplication VERSION 1.0.0)
 .. _cmake.pmm:

    include(pmm.cmake)
    pmm(CMakeCM ROLLING
        DDS DEPENDS neo-sqlite3^0.2.2
        )
 *Easy* Mode: PMM Support
 ************************

    include(libman)
    import_packages("neo-sqlite3")
 `PMM`_ is the *package package manager*, and can be used to control and access
 package managers from within CMake scripts. This includes controlling ``dds``.
 With PMM, we can automate all of the previous steps into a single line.

    add_executable(my-application app.cpp)
    target_link_libraries(my-application PRIVATE neo::sqlite3)
 For a complete rundown on using PMM to get dependencies via ``dds``, refer to
 the :doc:`/howto/cmake` page.

 This removes the requirement that we write a separate dependencies file, and we
 no longer need to invoke ``dds build-deps`` externally, as it is all handled
 by ``pmm``.
 Using PMM removes the requirement that we write a separate dependencies file,
 and we no longer need to invoke ``dds build-deps`` externally, as it is all
 handled by PMM.
--- a/docs/guide/index.rst
+++ b/docs/guide/index.rst
@@ -9,7 +9,8 @@ User Guide
    packages
    toolchains
    source-dists
    repo
    catalog
    pkg-cache
    remote-pkgs
    interdeps
    build-deps
    cmake
--- a/docs/guide/interdeps.rst
+++ b/docs/guide/interdeps.rst
@@ -85,8 +85,8 @@ versions of the dependency are supported.
    Refer to: :ref:`deps.ranges.why-lowest`.

 ``dds`` compatible-version ranges are similar to the shorthand range specifiers
 supported by ``npm`` and ``npm``-like tools. There are five (and a half)
 version range formats available, listed in order of most-to-least restrictive:
 supported by ``npm`` and ``npm``-like tools. There are four version range kinds
 available, listed in order of most-to-least restrictive:

 Exact: ``@1.2.3``
    Specifies an *exact* requirement. The dependency must match the named
--- a/docs/guide/packages.rst
+++ b/docs/guide/packages.rst
@@ -56,7 +56,7 @@ If a file's extension is not listed in the table above, ``dds`` will ignore it.
 .. note::
    Although headers are not compiled, this does not mean they are ignored.
    ``dds`` still understands and respects headers, and they are collected
    together as part of *source distribution*.
    together as part of a *source distribution*.


 .. _pkgs.apps-tests:
@@ -65,15 +65,42 @@ Applications and Tests
 **********************

 ``dds`` will recognize certain compilable source files as belonging to
 applications and tests. If a compilable source file stem ends with ``.main`` or
 ``.test``, that source file is assumed to correspond to an executable to
 generate. The filename stem before the ``.main`` or ``.test`` will be used as
 the name of the generated executable. For example:
 applications and tests, depending on the filenames "stem," which is the part of
 the filename not including the outer-most file extension. If a compilable source
 filename stem ends with ``.main`` or ``.test``, that source file is assumed to
 correspond to an executable to generate. The filename second-inner stem before
 the ``.main`` or ``.test`` will be used as the name of the generated executable.
 For example:

 - ``foo.main.cpp`` will generate an executable named ``foo``.
 - ``bar.test.cpp`` will generate an executable named ``bar``.
 - ``cat-meow.main.cpp`` will generate an executable named ``cat-meow``.
 - ``cats.musical.test.cpp`` will generate an executable named ``cats.musical``.
 - Given ``foo.main.cpp``

  - The stem is ``foo.main``, whose extension is ``.main``, so we will generate
    an application.
  - The stem of ``foo.main`` is ``foo``, so the executable will be named
    ``foo``.

 - Given ``bar.test.cpp``

  - The stem is ``bar.test``, whose extension is ``.test``, so we will generate
    a test.
  - The stem of ``bar.test`` is ``bar``, so will generate an executable named
    ``bar``.

 - Given ``cat-meow.main.cpp``

  - The stem is ``cat-meow.main``, which has extension ``.main``, so it is an
    application.
  - The stem of ``cat-meow.main`` is ``cat-meow``, so will generate an
    executable named ``cat-meow``.

 - Given ``cats.musical.test.cpp``

  - The stem is ``cats.musical.test``, which has extension ``.test``, so this is
    a text executable.
  - The stem of ``cats.musical.test`` is ``cats.musical``, so we will generate
    an executable named ``cats.musical``.
  - Note that the dot in ``cats.musical`` is not significant, as ``dds`` does
    strip any further extensions.

 .. note::
    ``dds`` will automatically append the appropriate filename extension to the
@@ -161,7 +188,7 @@ In order for any code to compile and resolve these ``#include`` directives, the
 ``src/`` directory must be added to their *include search path*.

 Because the ``#include`` directives are based on the *portable* source root,
 the exactly location of ``src/`` is not important to the content of the
 the exact location of ``src/`` is not important to the content of the
 consuming source code, and can thus be relocated and renamed as necessary.
 Consumers only need to update the path of the *include search path* in a single
 location rather than modifying their source code.
@@ -285,8 +312,8 @@ The primary distribution format of packages that is used by ``dds`` is the

 Packages are identified by a name/version pair, joined together by an ``@``
 symbol. The version of a package must be a semantic version string. Together,
 the ``name@version`` string forms the *package ID*, and it must be unique
 within a repository or package catalog.
 the ``name@version`` string forms the *package ID*, and it must be unique within
 a repository or local package cache.

 In order for a package to be exported by ``dds`` it must have a
 ``package.json5`` file at its package root. Three keys are required to be
--- a/docs/guide/pkg-cache.rst
+++ b/docs/guide/pkg-cache.rst
@@ -0,0 +1,90 @@
 The Local Package Cache
 #######################

 ``dds`` maintains a local cache of packages that it has obtained at the request
 of a user. The packages themselves are stored as
 :doc:`source distributions <source-dists>` (``dds`` does not store the binaries
 that it builds within this package cache).


 Reading Repository Contents
 ***************************

 Most times, ``dds`` will manage the cache content silently, but it may be useful
 to see what ``dds`` is currently storing away.

 The content of the cache can be seen with the ``pkg ls`` subcommand::

 > dds pkg ls

 This will print the names of packages that ``dds`` has downloaded, as well as
 the versions of each.


 Obtaining Packages
 ******************

 .. seealso:: See also: :doc:`remote-pkgs`

 When ``dds`` builds a package, it will also build the dependency libraries of
 that package. In order for the dependency build to succeed, it must have a
 local copy of the source distribution of that dependency.

 When ``dds`` performs dependency resolution, it will consider both locally
 cached packages, as well as packages that are available from any
 :doc:`remote packages <remote-pkgs>`. If the dependency solution requires any
 packages that are not in the local cache, it will use the information in its
 catalog database to obtain a source distribution for each missing package. These
 source distributions will automatically be added to the local cache, and later
 dependency resolutions will not need to download that package again.

 This all happens automatically when a project is built: There is **no**
 "``dds install``" subcommand.


 Manually Downloading a Dependency
 =================================

 It may be useful to obtain a copy of the source distribution of a package
 from a remote. The ``pkg get`` command can be used to do this::

 > dds pkg get <name>@<version>

 This will obtain the source distribution of the package matching the given
 package ID and place that distribution in current working directory, using the
 package ID as the name of the source distribution directory::

    $ dds pkg get spdlog@1.4.2
    [ ... ]

    $ ls .
    .
    ..
    spdlog@1.4.2

    $ ls ./spdlog@1.4.2/
    include/
    src/
    library.json5
    package.json5


 .. _repo.import-local:

 Exporting a Project into the Repository
 ***************************************

 ``dds`` can only use packages that are available in the local cache. For
 packages that have a listing in the catalog, this is not a problem. But if one
 is developing a local package and wants to allow it to be used in another local
 package, that can be done by importing that project into the package cache as a
 regular package, as detailed in :ref:`sdist.import`::

 > dds pkg import /path/to/project

 This command will create a source distribution and place it in the local cache.
 The package is now available to other projects on the local system.

 .. note::
    This doesn't import in "editable" mode: A snapshot of the package root
    will be taken and imported to the local cache.
--- a/docs/guide/remote-pkgs.rst
+++ b/docs/guide/remote-pkgs.rst
@@ -0,0 +1,231 @@
 Remote Packages and Repositories
 ################################

 .. highlight:: bash

 ``dds`` stores a local database of available packages, along with their
 dependency statements and information about how a source distribution thereof
 may be obtained.

 Inside the database are *package repositories*, which are remote servers that
 contain their own database of packages, and may also contain the packages
 themselves. An arbitrary number of package repositories may be added to the
 local database. When ``dds`` updates its package information, it will download
 the package database from each registered remote and import the listings into
 its own local database, making them available for download.


 Viewing Available Packages
 **************************

 The default catalog database is stored in a user-local location, and the
 available packages can be listed with ``dds pkg search``::

  $ dds pkg search
      Name: abseil
  Versions: 2018.6.0, 2019.8.8, 2020.2.25
      From: repo-1.dds.pizza

      Name: asio
  Versions: 1.12.0, 1.12.1, 1.12.2, 1.13.0, 1.14.0, 1.14.1, 1.16.0, 1.16.1
      From: repo-1.dds.pizza

      Name: boost.leaf
  Versions: 0.1.0, 0.2.0, 0.2.1, 0.2.2, 0.2.3, 0.2.4, 0.2.5, 0.3.0
      From: repo-1.dds.pizza

      Name: boost.mp11
  Versions: 1.70.0, 1.71.0, 1.72.0, 1.73.0
      From: repo-1.dds.pizza

 Optionally, one can search with a glob/fnmatch-style pattern::

  $ dds pkg search 'neo-*'
      Name: neo-buffer
  Versions: 0.2.1, 0.3.0, 0.4.0, 0.4.1, 0.4.2
      From: repo-1.dds.pizza

      Name: neo-compress
  Versions: 0.1.0, 0.1.1, 0.2.0
      From: repo-1.dds.pizza

      Name: neo-concepts
  Versions: 0.2.2, 0.3.0, 0.3.1, 0.3.2, 0.4.0
      From: repo-1.dds.pizza


 Remote Repositories
 *******************

 A remote package repository consists of an HTTP(S) server serving the following:

 1. An accessible directory containing source distributions of various packages,
   and
 2. An accessible database file that contains a listing of packages and some
   repository metadata.

 The exact details of the directory layout and database are not covered here, and
 are not necessary to make use of a repository.

 When ``dds`` uses a repository, it pulls down the database file and imports its
 contents into its own local database, associating the imported package listings
 with the remote repository which provides them. Pulling the entire database at
 once allows ``dds`` to perform much faster dependency resolution and reduces
 the round-trips associated with using a dynamic package repository.


 Adding a Repository
 ===================

 Adding a remote repository to the local database is a simple single command::

  $ dds pkg repo add "https://repo-1.dds.pizza"
  [info ] Pulling repository contents for repo-1.dds.pizza [https://repo-1.dds.pizza/]

 This will tell ``dds`` to add ``https://repo-1.dds.pizza`` as a remote
 repository and immediately pull its package listings for later lookup. This
 initial update can be suppressed with the ``--no-update`` flag.

 .. note::

  After the initial ``pkg repo add``, the repository is *not* identified by its
  URL, but by its *name*, which is provided by the repository itself. The name
  is printed the first time it is added, and can be seen using ``pkg repo ls``.


 Listing Repositories
 ====================

 A list of package repositories can be seen with the ``pkg repo ls`` subcommand::

  $ dds pkg repo ls


 Removing Repositories
 =====================

 A repository can be removed by the ``pkg repo remove`` subcommand::

  $ dds pkg repo remove <name>

 Where ``<name>`` is given as the *name* (not URL!) of the repository.

 **Note** that removing a repository will make all of its corresponding remote
 packages unavailable, while packages that have been pulled into the local cache
 will remain available even after removing a repository.


 Updating Repository Data
 ========================

 Repository data and package listings can be updated with the ``pkg repo update``
 subcommand::

  $ dds pkg repo update

 This will pull down the databases of all registered remote repositories. If
 ``dds`` can detect that a repository's database is unchanged since a prior
 update, that update will be skipped.


 The Default Repository
 **********************

 When ``dds`` first initializes its local package database, it will add a single
 remote repository: ``https://repo-1.dds.pizza/``, which has the name
 ``repo-1.dds.pizza``. At the time of writing, this is the only official ``dds``
 repository, and is populated sparsely with hand-curated and prepared packages.
 In the future, the catalog of packages will grow and be partially automated.

 There is nothing intrinsically special about this repository other than it being
 the default when ``dds`` first creates its package database. It can be removed
 as any other, should one want tighter control over package availability.


 Managing a Repository
 *********************

 A ``dds`` repository is simply a directory of static files, so any HTTP server
 that can serve from a filesystem can be used as a repository. ``dds`` also
 ships with a subcommand, ``repoman``, that can be used to manage a repository
 directory.


 Initializing a Repository
 =========================

 Before anything can be done, a directory should be converted to a repository by
 using ``repoman init``::

  $ dds repoman init ./my-repo-dir --name=my-experimental-repo

 This will add the basic metadata into ``./my-repo-dir`` such that ``dds`` will
 be able to pull package data from it.

 The ``--name`` argument should be used to give the repository a unique name. The
 name should be globally unique to avoid collisions: When ``dds`` pulls a
 repository that declares a given name, it will *replace* the package listings
 associated with any repository of that name. As such, generic names like
 ``main`` or ``packages`` shouldn't be used in production.


 Listing Contents
 ================

 The packages in a repository can be listed using ``dds repoman ls <repo-dir>``.
 This will simply print each package identifier that is present in the
 repository.


 Importing Source Distributions
 ==============================

 If you have a source distribution archive, it can be imported with the
 appropriately named ``dds repoman import`` command::

  $ dds repoman import ./my-repo some-pkg@1.2.3.tar.gz

 Multiple archive paths may be provided to import them all at once.


 Adding a Package by URL
 =======================

 A repository can also list packages that it does not host itself. Such a package
 listing can be added "by URL," where the URL tells ``dds`` how to pull the
 source distribution of the package. Beyond basic HTTP(S) URLs, ``dds`` can also
 clone packages via ``git``::

  $ dds repoman add ./my-repo git+https://github.com/vector-of-bool/neo-fun.git#0.5.2

 The above URL tells ``dds`` that it can use ``git clone`` against
 ``https://github.com/vector-of-bool/neo-fun.git`` and ask for tag ``0.5.2`` to
 get a source distribution directory that can be imported. Note the fragment on
 ``git`` URLs! The fragment is required to specify the branch or tag to clone.

 If the package is available on GitHub, ``dds`` has a shorthand URL for that::

  $ dds repoman add ./my-repo github:vector-of-bool/neo-fun/0.6.0

 The ``github:`` URL scheme tells ``dds`` to clone from GitHub. A ``github:`` URL
 must have exactly three path elements to determine *what* to download:
 ``github:{owner}/{repository}/{branch-or-tag}``.

 .. note::

  The ``github:`` URL lacks an *authority* element, and as such *does not* use
  the double-slash.

 .. note::

  ``repoman add`` will immediately attempt to pull a source distribution from
  the given URL so that it may import the package's metadata into its listing
  database. You cannot add a URL that is not already accessible.


 Removing Packages
 =================

 A package can be removed from a repository with
 ``dds repoman remove <repo-dir> <pkg-id>``, where ``<pkg-id>`` is the
 ``<name>@<version>`` of the package to remove.
--- a/docs/guide/repo.rst
+++ b/docs/guide/repo.rst
@@ -1,92 +0,0 @@
 The Local Package Repository
 ############################

 ``dds`` maintains a local repository of packages that it has obtained at the
 request of a user. The packages themselves are stored as
 :doc:`source distributions <source-dists>` (``dds`` does not store the binaries
 that it builds within the repository).


 Reading Repository Contents
 ***************************

 Most times, ``dds`` will manage the repository content silently, but it may be
 useful to see what ``dds`` is currently storing away.

 The content of the repostiory can be seen with the ``repo`` subcommand::

 > dds repo ls

 This will print the names of packages that ``dds`` has downloaded, as well as
 the versions of each.


 Obtaining Packages
 ******************

 .. seealso:: See also: :doc:`catalog`

 When ``dds`` builds a package, it will also build the dependency libraries of
 that package. In order for the dependency build to succeed, it must have a
 local copy of the source distribution of that dependency.

 When ``dds`` performs dependency resolution, it will consider both existing
 packages in the local repository, as well as packages that are available from
 the :doc:`package catalog <catalog>`. If the dependency solution requires any
 packages that are not in the local repository, it will use the information in
 the catalog to obtain a source distribution for each missing package. These
 source distributions will automatically be added to the local repository, and
 later dependency resolutions will not need to download that package again.


 Manually Downloading a Dependency
 =================================

 It may be useful to obtain a copy of the source distribution of a package
 contained in the catalog. The ``catalog get`` command can be used to do this::

 > dds catalog get <name>@<version>

 This will obtain the source distribution of the package matching the named
 identifier and place that distribution in current working directory, using the
 package ID as the name of the source distribution directory::

    $ dds catalog get spdlog@1.4.2
    [ ... ]

    $ ls .
    .
    ..
    spdlog@1.4.2

    $ ls ./spdlog@1.4.2/
    include/
    src/
    library.json5
    package.json5


 .. _repo.export-local:

 Exporting a Project into the Repository
 ***************************************

 ``dds`` can only use packages that are available in the local repository. For
 packages that have a listing in the catalog, this is not a problem. But if one
 is developing a local package and wants to allow it to be used in another local
 package, that can be done by exporting a source distribution from the package
 root::

 > dds sdist export

 This command will create a source distribution and place it in the local
 repository. The package is now available to other projects on the local system.

 .. note::
    This doesn't export in "editable" mode: A snapshot of the package root
    will be taken and exported to the local repository.

 If one tries to export a package root into a repository that already contains
 a package with a matching identifier, ``dds`` will issue an error. If the
 ``--replace`` flag is specified with ``sdist export``, then ``dds`` will
 forcibly replace the package in the local repository with a new copy.
--- a/docs/guide/source-dists.rst
+++ b/docs/guide/source-dists.rst
@@ -1,9 +1,9 @@
 Source Distributions
 ####################

 A *source distribution* is ``dds``'s primary format for consuming and
 distributing packages. A source distribution, in essence, is a
 :ref:`package root <pkgs.pkg-root>` archive that contains only the files
 A *source distribution* (often abbreviated as "sdist") is ``dds``'s primary
 format for consuming and distributing packages. A source distribution, in
 essence, is a :ref:`package root <pkgs.pkg-root>` that contains only the files
 necessary for ``dds`` to reproduce the full build of all libraries in the
 package. The source distribution retains the directory structure of every
 :ref:`source root <pkgs.source-root>` of the original package, and thus retains
@@ -18,7 +18,7 @@ Generating a Source Distribution
 Generating a source distribution from a project directory is done with the
 ``sdist`` subcommand::

 > dds sdist create
 > dds pkg create

 The above command can be executed within a package root, and the result will be
 a gzip'd tar archive that reproduces the package's filesystem structure, but
@@ -26,8 +26,8 @@ only maintaining the files that are necessary for ``dds`` to reproduce a build
 of that package.

 The ``--project=<dir>`` flag can be provided to override the directory that
 ``dds`` will use as the package root. The default is the working directory of
 the project.
 ``dds`` will use as the package root. The default is the current working
 directory.

 The ``--out=<path>`` flag can be provided to override the destination path of
 the archive. The path should not name an existing file or directory. By default,
@@ -37,10 +37,32 @@ then ``dds`` will overwrite the destination if it names an existing file or
 directory.


 Importing a Source Ditsribution
 .. _sdist.import:

 Importing a Source Distribution
 *******************************

 Given a source distribution archive, one can import the package into the local
 repository with a single command::
 package cache with a single command::

 > dds pkg import some-package@1.2.3.tar.gz

 You can also specify an HTTP or HTTPS URL to download a source distribution
 archive to import without downloading it separately::

 > dds pkg import https://example.org/path/to/sdist.tar.gz

 Alternatively, if a directory correctly models a source distribution, then
 that directory can be imported in the same manner::

 > dds pkg import /path/to/some/project

 Importing a package will allow projects on the system to use the imported
 package as a dependency.

 .. note::

 > dds repo import some-package@1.2.3.tar.gz
    If one tries to import a package root into the cache that already contains a
    package with a matching identifier, ``dds`` will issue an error. This
    behavior can be overridden by providing ``--if-exists=replace`` on the
    command-line.
--- a/docs/guide/toolchains.rst
+++ b/docs/guide/toolchains.rst
@@ -299,6 +299,16 @@ Specify *additional* compiler options, possibly per-language.

 Specify *additional* link options to use when linking executables.

 .. note::

    ``dds`` does not invoke the linker directly, but instead invokes the
    compiler with the appropriate flags to perform linking. If you need to pass
    flags directly to the linker, you will need to use the compiler's options to
    direct flags through to the linker. On GNU-style, this is
    ``-Wl,<linker-option>``. With MSVC, a separate flag ``/LINK`` must be
    specified, and all following options are passed to the underlying
    ``link.exe``.


 ``optimize``
 ------------
--- a/docs/howto/cmake.rst
+++ b/docs/howto/cmake.rst
@@ -0,0 +1,214 @@
 How Do I Use ``dds`` in a CMake Project?
 ########################################

 .. highlight:: cmake

 If you have a CMake project and you wish to pull your dependencies via ``dds``,
 you're in luck: Such a process is explicitly supported. Here's the recommended
 approach:

 #. Download `PMM`_ and place and commit `the PMM script <pmm.cmake>`_ into your
   CMake project. [#f1]_
 #. In your ``CMakeLists.txt``, ``include()`` ``pmm.cmake``.
 #. Call ``pmm(DDS)`` and list your dependencies.

 Below, we'll walk through this in more detail.

 .. note::

  You don't even have to have ``dds`` downloaded and present on your system to
  use ``dds`` in PMM! Read on...


 Using PMM
 *********

 `PMM`_ is the *Package Manager Manager* for CMake, and is designed to offer
 greater integration between a CMake build and an external package management
 tool. `PMM`_ supports Conan, vcpkg, and, of course, ``dds``.

 .. seealso::

  Refer to the ``README.md`` file in `the PMM repo <PMM>`_ for information on
  how to use PMM.


 Getting PMM
 ===========

 To use PMM, you need to download one only file and commit it to your project:
 `pmm.cmake`_, the entrypoint for PMM [#f1]_. It is not significant where the
 ``pmm.cmake`` script is placed, but it should be noted for inclusion.

 ``pmm.cmake`` should be committed to the project because it contains version
 pinning settings for PMM and can be customized on a per-project basis to alter
 its behavior for a particular project's needs.


 Including PMM
 =============

 Suppose I have downloaded and committed `pmm.cmake`_ into the ``tools/``
 subdirectory of my CMake project. To use it in CMake, I first need to
 ``include()`` the script. The simplest way is to simply ``include()`` the file

 .. code-block::
  :caption: CMakeLists.txt
  :emphasize-lines: 4

  cmake_minimum_required(VERSION 3.12)
  project(MyApplication VERSION 2.1.3)

  include(tools/pmm.cmake)

 The ``include()`` command should specify the path to ``pmm.cmake``, including
 the file extension, relative to the directory that contains the CMake script
 that contains the ``include()`` command.


 Running PMM
 ===========

 Simply ``include()``-ing PMM won't do much, because we need to actually *invoke
 it*.

 PMM's main CMake command is ``pmm()``. It takes a variety of options and
 arguments for the package managers it supports, but we'll only focus on ``dds``
 for now.

 The basic signature of the ``pmm(DDS)`` command looks like this::

  pmm(DDS [DEP_FILES [filepaths...]]
          [DEPENDS [dependencies...]]
          [TOOLCHAIN file-or-id])

 The most straightforward usage is to use only the ``DEPENDS`` argument. For
 example, if we want to import `{fmt} <https://fmt.dev>`_::

  pmm(DDS DEPENDS "fmt^7.0.3")

 When CMake executes the ``pmm(DDS ...)`` line above, PMM will download the
 appropriate ``dds`` executable for your platform, generate
 :doc:`a dds toolchain </guide/toolchains>` based on the CMake environment, and
 then invoke ``dds build-deps`` to build the dependencies that were listed in the
 ``pmm()`` invocation. The results from ``build-deps`` are then imported into
 CMake as ``IMPORTED`` targets that can be used by the containing CMake project.

 .. seealso::

  For more in-depth discussion on ``dds build-deps``, refer to
  :doc:`/guide/build-deps`.

 .. note::
  The ``_deps`` directory and generated CMake imports file will be placed in
  the CMake build directory, out of the way of the rest of the project.

 .. note::
  The version of ``dds`` that PMM downloads depends on the version of PMM
  that is in use.


 Using the ``IMPORTED`` Targets
 ==============================

 Like with ``dds``, CMake wants us to explicitly declare how our build targets
 *use* other libraries. After ``pmm(DDS)`` executes, there will be ``IMPORTED``
 targets that can be linked against.

 In ``dds`` (and in libman), a library is identified by a combination of
 *namespace* and *name*, joined together with a slash ``/`` character. This
 *qualified name* of a library is decided by the original package author or
 maintainer, and should be documented. In the case of ``fmt``, the only library
 is ``fmt/fmt``.

 When ``pmm(DDS)`` imports a library, it creates a qualified name using a
 double-colon "``::``" instead of a slash. As such, our ``fmt/fmt`` is imported
 in CMake as ``fmt::fmt``. We can link against it as we would with any other
 target::

  add_executable(my-application app.cpp)
  target_link_libraries(my-application PRIVATE fmt::fmt)

 This will allow us to use **{fmt}** in our CMake project as an external
 dependency.

 In all, this is our final ``CMakeLists.txt``:

 .. code-block::
  :caption: ``CMakeLists.txt``

  cmake_minimum_required(VERSION 3.12)
  project(MYApplication VERSION 2.1.3)

  include(tools/pmm.cmake)
  pmm(DDS DEPENDS fmt^7.0.3)

  add_executable(my-application app.cpp)
  target_link_libraries(my-application PRIVATE fmt::fmt)


 Changing Compile Options
 ************************

 ``dds`` supports setting compilation options using
 :doc:`toolchains </guide/toolchains>`. PMM supports specifying a toolchain using
 the ``TOOLCHAIN`` argument::

  pmm(DDS DEPENDS fmt^7.0.3 TOOLCHAIN my-toolchain.json5)

 Of course, writing a separate toolchain file just for your dependencies can be
 tedious. For this reason, PMM will write a toolchain file on-the-fly when it
 executes ``dds``. The generated toolchain is created based on the current CMake
 settings when ``pmm()`` was executed.

 To add compile options, simply ``add_compile_options``::

  add_compile_options(-fsanitize=address)
  pmm(DDS ...)

 The above will cause all ``dds``-built dependencies to compile with
 ``-fsanitize=address`` as a command-line option.

 The following CMake variables and directory properties are used to generate the
 ``dds`` toolchain:

 ``COMPILE_OPTIONS``
  Adds additional compiler options. Should be provided by
  ``add_compile_options``.

 ``COMPILE_DEFINITIONS``
  Add preprocessor definitions. Should be provided by
  ``add_compile_definitions``

 ``CXX_STANDARD``
  Control the ``cxx_version`` in the toolchian

 ``CMAKE_MSVC_RUNTIME_LIBRARY``
  Sets the ``runtime`` option. This option has limited support for generator
  expressions.

 ``CMAKE_C_FLAGS`` and ``CMAKE_CXX_FLAGS``, and their per-config variants
  Set the basic compile flags for the respective file sypes

 ``CXX_COMPILE_LAUNCHER``
  Allow providing a compiler launcher, e.g. ``ccache``.

 .. note::

  Calls to ``add_compile_options``, ``add_compile_definitions``, or other CMake
  settings should appear *before* calling ``pmm(DDS)``, since the toolchain file
  is generated and dependencies are built at that point.

  ``add_link_options`` has no effect on the ``dds`` toolchain, as ``dds`` does
  not generate any runtime binaries.

 .. rubric:: Footnotes

 .. [#f1]
  Do not use ``file(DOWNLOAD)`` to "automatically" obtain `pmm.cmake`_. The
  ``pmm.cmake`` script is already built to do this for the rest of PMM. The
  `pmm.cmake`_ script itself is very small and is *designed* to be copy-pasted
  and committed into other projects.

 .. _PMM: https://github.com/vector-of-bool/pmm
 .. _pmm.cmake: https://github.com/vector-of-bool/pmm/raw/master/pmm.cmake
--- a/docs/howto/deps.rst
+++ b/docs/howto/deps.rst
@@ -0,0 +1,124 @@
 How Do I Use Other Libraries as Dependencies?
 #############################################

 Of course, fundamental to any build system is the question of consuming
 dependencies. ``dds`` takes an approach that is both familiar and novel.

 The *Familiar*:
  Dependencies are listed in a project's package manifest file
  (``package.json5``, for ``dds``).

  A range of acceptable versions is provided in the package manifest, which
  tells ``dds`` and your consumers what versions of a particular dependency are
  allowed to be used with your package.

  Transitive dependencies are resolved and pulled the same as if they were
  listed in the manifest as well.

 The *Novel*:
  ``dds`` does not have a separate "install" step. Instead, whenever a ``dds
  build`` is executed, the dependencies are resolved, downloaded, extracted,
  and compiled. Of course, ``dds`` caches every step of this process, so you'll
  only see the download, extract, and compilation when you add a new dependency,

  Additionally, changes in the toolchain will necessitate that all the
  dependencies be re-compiled. Since the compilation of dependencies happens
  alongside the main project, the same caching layer that provides incremental
  compilation to your own project will be used to perform incremental
  compilation of your dependencies as well.

 .. seealso:: :doc:`/guide/interdeps`


 Listing Package Dependencies
 ****************************

 Suppose you have a project and you wish to use
 `spdlog <https://github.com/gabime/spdlog>`_ for your logging. To begin, we need
 to find a ``spdlog`` package. We can search via ``dds pkg search``::

  $ dds pkg search spdlog
      Name: spdlog
  Versions: 1.4.0, 1.4.1, 1.4.2, 1.5.0, 1.6.0, 1.6.1, 1.7.0
      From: repo-1.dds.pizza
            No description

 .. note::
  If you do not see any results, you may need to add the main repository to
  your package database. Refer to :doc:`/guide/remote-pkgs`.

 In the output above, we can see one ``spdlog`` group with several available
 versions. Let's pick the newest available, ``1.7.0``.

 If you've followed at least the :doc:`Hello, World tutorial </tut/hello-world>`,
 you should have at least a ``package.json5`` file present. Dependencies are
 listed in the ``package.json5`` file under the ``depends`` key as an array of
 dependency statement strings:

 .. code-block:: js
  :emphasize-lines: 5-7

  {
    name: 'my-application',
    version: '1.2.3',
    namespace: 'myself',
    depends: [
      "spdlog^1.7.0"
    ]
  }

 The string ``"spdlog^1.7.0"`` is a *dependency statement*, and says that we want
 ``spdlog``, with minimum version ``1.7.0``, but less than version ``2.0.0``.
 Refer to :ref:`deps.ranges` for information on the version range syntax.

 This is enough that ``dds`` knows about our dependency, but there is another
 step that we need to take:


 Listing Usage Requirements
 **************************

 The ``depends`` is a package-level dependency, but we need to tell ``dds`` that
 we want to *use* a library from that package. For this, we need to provide a
 ``library.json5`` file alongside the ``package.json5`` file.

 .. seealso::
  The ``library.json5`` file is discussed in :ref:`pkgs.libs` and
  :ref:`deps.lib-deps`.

 We use the aptly-named ``uses`` key in ``library.json5`` to specify what
 libraries we wish to use from our package dependencies. In this case, the
 library from ``spdlog`` is named ``spdlog/spdlog``:

 .. code-block:: js

  {
    name: 'my-application',
    uses: [
      'spdlog/spdlog'
    ]
  }


 Using Dependencies
 ******************

 We've prepared our ``package.json5`` and our ``library.json5``, so how do we get
 the dependencies and use them in our application?

 Simply *use them*. There is no separate "install" step. Write your application
 as normal:

 .. code-block:: cpp
  :caption: src/app.main.cpp

  #include <spdlog/spdlog.h>

  int main() {
    spdlog::info("Hello, dependency!");
  }

 Now, when you run ``dds build``, you'll see ``dds`` automatically download
 ``spdlog`` *as well as* ``fmt`` (a dependency of ``spdlog``), and then build all
 three components *simultaneously*. The result will be an ``app`` executable that
 uses ``spdlog``.
--- a/docs/howto/index.rst
+++ b/docs/howto/index.rst
@@ -0,0 +1,11 @@
 How-To's
 ########

 These pages will discuss some common "How-do-I...?" questions.


 .. toctree::
  :maxdepth: 2

  deps
  cmake
--- a/docs/index.rst
+++ b/docs/index.rst
@@ -15,6 +15,7 @@ the :doc:`tut/index` page.
    :maxdepth: 2

    tut/index
    howto/index
    guide/index
    design
    dev/index
--- a/docs/tut/hello-test.rst
+++ b/docs/tut/hello-test.rst
@@ -98,7 +98,7 @@ leave the condition the same, though:
 Now running ``dds build`` will print more output that Catch has generated as
 part of test execution, and we can see the reason for the failing test::

    [16:41:45] [error] Test <root>/_build/test/hello/strings failed! Output:
    [error] Test <root>/_build/test/hello/strings failed! Output:

    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    strings is a Catch v2.10.2 host application.
--- a/docs/tut/hello-world.rst
+++ b/docs/tut/hello-world.rst
@@ -168,9 +168,9 @@ If you run the ``dds build`` command again, you will now see an error:

 .. code-block:: text

    [12:55:25] [info ] [dds-hello] Link: hello-world
    [12:55:25] [info ] [dds-hello] Link: hello-world                    -     57ms
    [12:55:25] [error] Failed to link executable '<root>/_build/hello-world'.
    [info ] [dds-hello] Link: hello-world
    [info ] [dds-hello] Link: hello-world                    -     57ms
    [error] Failed to link executable '<root>/_build/hello-world'.
    ...
    <additional lines follow>

@@ -238,6 +238,10 @@ package root:

 Rebuilding the project will show no difference at the moment.

 .. note::
    You may also use a ``.jsonc`` or ``.json`` file extension. ``dds`` will
    search for all of these files, but they will all be parsed as JSON5.

 .. seealso::
    Creating a single application executable is fine and all, but what if we
    want to create libraries? See the next page: :doc:`hello-lib`
--- a/docs/tut/index.rst
+++ b/docs/tut/index.rst
@@ -5,15 +5,20 @@ The child pages here contain introductory material for getting started with
 using ``dds``. If you don't know where to start, this will be a good
 place to begin!

 .. seealso::

  For more focused "how-do-i" topics, refer to :doc:`/howto/index`.

 .. note::
   The shell samples in these pages are written with Unix-flavored commands,
   but the analogous process will work just as well on Windows systems.
   Translate as appropriate.
  The shell samples in these pages are written with Unix-flavored commands,
  but the analogous process will work just as well on Windows systems.
  Translate as appropriate.


 .. toctree::
    :maxdepth: 2
  :maxdepth: 2

    hello-world
    hello-lib
    hello-test
  install
  hello-world
  hello-lib
  hello-test
--- a/docs/tut/install.rst
+++ b/docs/tut/install.rst
@@ -0,0 +1,154 @@
 Getting/Installing ``dds``
 ##########################

 ``dds`` ships as a single statically linked executable. It does not have any
 installer or distribution package.


 Downloading
 ***********

 Downloads are available on `the main dds website <https://dds.pizza/downloads>`_
 as well as
 `the GitHub Releases page <https://github.com/vector-of-bool/dds/releases>`_. Select the executable appropriate for your platform.

 Alternatively, the appropriate executable can be downloaded directly from the
 command-line with an easy-to-remember URL. Using ``curl``:

 .. code-block:: sh

  # For Linux, writes a file in the working directory called "dds"
  curl dds.pizza/get/linux -Lo dds

  # For macOS, writes a file in the working directory called "dds"
  curl dds.pizza/get/macos -Lo dds

 Or using PowerShell on Windows:

 .. code-block:: powershell

  # Writes a file in the working directory called "dds.exe"
  Invoke-WebRequest dds.pizza/get/windows -OutFile dds.exe

 **On Linux, macOS, or other Unix-like system**, you will need to mark the
 downloaded file as executable:

 .. code-block:: sh

  # Add the executable bit to the file mode for the file named "dds"
  chmod +x dds


 Installing
 **********

 Note that it is not necessary to "install" ``dds`` before it can be used.
 ``dds`` is a single standalone executable that can be executed in whatever
 directory it is placed. If you are running a CI process and need ``dds``, it is
 viable to simply download the executable and place it in your source tree and
 execute it from that directory.

 **However:** If you want to be able to execute ``dds`` with an unqualified
 command name from any shell interpreter, you will need to place ``dds`` on a
 directory on your shell's ``PATH`` environment variable.


 Easy Mode: ``install-yourself``
 ===============================

 ``dds`` includes a subcommand "``install-yourself``" that will move its own
 executable to a predetermined directory and ensure that it exists on your
 ``PATH`` environment variable. It is simple enough to run the command::

  $ ./dds install-yourself

 This will copy the executable ``./dds`` into a user-local directory designated
 for containing user-local executable binaries. On Unix-like systems, this is
 ``~/.local/bin``, and on Windows this is ``%LocalAppData%/bin``. ``dds`` will
 also ensure that the destination directory is available on the ``PATH``
 environment variable for your user profile.

 .. note::

  If ``dds`` reports that is has modified your PATH, you will need to restart
  your command line and any other applications that wish to see ``dds`` on your
  ``PATH``.


 Manually: On Unix-like Systems
 ==============================

 For an **unprivileged, user-specific installation (preferred)**, we recommend
 placing ``dds`` in ``~/.local/bin`` (Where ``~`` represents the ``$HOME``
 directory of the current user).

 Although not officially standardized,
 `the XDG Base Directory specification <https://specifications.freedesktop.org/basedir-spec/basedir-spec-latest.html>`_
 recommends several related directories to live within ``~/.local`` (and ``dds``
 itself follows those recommendations for the most part).
 `The systemd file heirarchy <https://www.freedesktop.org/software/systemd/man/file-hierarchy.html>`_
 also recommends placing user-local binaries in ``~/.local/bin``, and several
 Linux distribution's shell packages add ``~/.local/bin`` to the startup
 ``$PATH``.

 Placing a file in ``~/.local/bin`` requires no privileges beyond what the
 current user can execute, and gives a good isolation to other users on the
 system. Other tools (e.g. ``pip``) will also use ``~/.local/bin`` for the
 installation of user-local scripts and commands.

 .. note::

  On some shells, ``~/.local/bin`` is not an entry on ``$PATH`` by default.
  Check if your shell's default ``$PATH`` environment variable contains
  ``.local/bin``. If it does not, refer to your shell's documentation on how to
  add this directory to the startup ``$PATH``.

 For a **system-wide installation**, place the downloaded ``dds`` executable
 within the ``/usr/local/bin/`` directory. This will be a directory on the
 ``PATH`` for any Unix-like system.

 .. note::

  **DO NOT** place ``dds`` in ``/usr/bin`` or ``/bin``: These are reserved for
  your system's package management utilities.


 Manually: On Windows
 ====================

 Unlike Unix-like systems, Windows does not have a directory designated for
 user-installed binaries that lives on the ``PATH``. If you have a directory that
 you use for custom binaries, simply place ``dds.exe`` in that directory.

 If you are unfamiliar with placing binaries and modifying your ``PATH``, read
 on:

 For an **unprivileged, user-specific installation**, ``dds`` should be placed in
 a user-local directory, and that directory should be added to the user ``PATH``.

 To emulate what ``dds install-yourself`` does, follow the following steps:

 #. Create a directory ``%LocalAppData%\bin\`` if it does not exist.

   For ``cmd.exe``

   .. code-block:: batch

      md %LocalAppData%\bin

   Or for PowerShell:

   .. code-block:: powershell

      md $env:LocalAppData\bin

 #. Copy ``dds.exe`` into the ``%LocalAppData%\bin`` directory.
 #. Go to the Start Menu, and run "Edit environment variables for your account"
 #. In the upper area, find and open the entry for the "Path" variable.
 #. Add an entry in "Path" for ``%LocalAppData%\bin``.
 #. Confirm your edits.
 #. Restart any applications that require the modified environment, including
   command-lines.

 If the above steps are performed successfully, you should be able to open a new
 command window and execute ``dds --help`` to get the help output.
--- a/package.jsonc
+++ b/package.jsonc
@@ -1,7 +1,7 @@
 {
    "$schema": "./res/package-schema.json",
    "name": "dds",
    "version": "0.1.0-alpha.5",
    "version": "0.1.0-alpha.6",
    "namespace": "dds",
    "depends": [
        "spdlog@1.7.0",
--- a/poetry.lock
+++ b/poetry.lock
@@ -1,3 +1,11 @@
 [[package]]
 name = "alabaster"
 version = "0.7.12"
 description = "A configurable sidebar-enabled Sphinx theme"
 category = "dev"
 optional = false
 python-versions = "*"

 [[package]]
 name = "apipkg"
 version = "1.5"
@@ -42,6 +50,33 @@ docs = ["furo", "sphinx", "zope.interface"]
 tests = ["coverage[toml] (>=5.0.2)", "hypothesis", "pympler", "pytest (>=4.3.0)", "six", "zope.interface"]
 tests_no_zope = ["coverage[toml] (>=5.0.2)", "hypothesis", "pympler", "pytest (>=4.3.0)", "six"]

 [[package]]
 name = "babel"
 version = "2.9.0"
 description = "Internationalization utilities"
 category = "dev"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"

 [package.dependencies]
 pytz = ">=2015.7"

 [[package]]
 name = "certifi"
 version = "2020.12.5"
 description = "Python package for providing Mozilla's CA Bundle."
 category = "dev"
 optional = false
 python-versions = "*"

 [[package]]
 name = "chardet"
 version = "4.0.0"
 description = "Universal encoding detector for Python 2 and 3"
 category = "dev"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"

 [[package]]
 name = "colorama"
 version = "0.4.4"
@@ -58,6 +93,14 @@ category = "main"
 optional = false
 python-versions = "*"

 [[package]]
 name = "docutils"
 version = "0.16"
 description = "Docutils -- Python Documentation Utilities"
 category = "dev"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"

 [[package]]
 name = "execnet"
 version = "1.7.1"
@@ -72,6 +115,22 @@ apipkg = ">=1.4"
 [package.extras]
 testing = ["pre-commit"]

 [[package]]
 name = "idna"
 version = "2.10"
 description = "Internationalized Domain Names in Applications (IDNA)"
 category = "dev"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"

 [[package]]
 name = "imagesize"
 version = "1.2.0"
 description = "Getting image size from png/jpeg/jpeg2000/gif file"
 category = "dev"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"

 [[package]]
 name = "importlib-metadata"
 version = "3.1.1"
@@ -108,6 +167,20 @@ pipfile_deprecated_finder = ["pipreqs", "requirementslib"]
 requirements_deprecated_finder = ["pipreqs", "pip-api"]
 colors = ["colorama (>=0.4.3,<0.5.0)"]

 [[package]]
 name = "jinja2"
 version = "2.11.2"
 description = "A very fast and expressive template engine."
 category = "dev"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"

 [package.dependencies]
 MarkupSafe = ">=0.23"

 [package.extras]
 i18n = ["Babel (>=0.8)"]

 [[package]]
 name = "json5"
 version = "0.9.5"
@@ -127,6 +200,14 @@ category = "dev"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"

 [[package]]
 name = "markupsafe"
 version = "1.1.1"
 description = "Safely add untrusted strings to HTML/XML markup."
 category = "dev"
 optional = false
 python-versions = ">=2.7,!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*"

 [[package]]
 name = "mccabe"
 version = "0.6.1"
@@ -192,6 +273,14 @@ category = "main"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"

 [[package]]
 name = "pygments"
 version = "2.7.3"
 description = "Pygments is a syntax highlighting package written in Python."
 category = "dev"
 optional = false
 python-versions = ">=3.5"

 [[package]]
 name = "pylint"
 version = "2.6.0"
@@ -281,6 +370,32 @@ pytest-forked = "*"
 psutil = ["psutil (>=3.0)"]
 testing = ["filelock"]

 [[package]]
 name = "pytz"
 version = "2020.5"
 description = "World timezone definitions, modern and historical"
 category = "dev"
 optional = false
 python-versions = "*"

 [[package]]
 name = "requests"
 version = "2.25.1"
 description = "Python HTTP for Humans."
 category = "dev"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"

 [package.dependencies]
 certifi = ">=2017.4.17"
 chardet = ">=3.0.2,<5"
 idna = ">=2.5,<3"
 urllib3 = ">=1.21.1,<1.27"

 [package.extras]
 security = ["pyOpenSSL (>=0.14)", "cryptography (>=1.3.4)"]
 socks = ["PySocks (>=1.5.6,!=1.5.7)", "win-inet-pton"]

 [[package]]
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 version = "0.18.0"
@@ -308,6 +423,116 @@ category = "dev"
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 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*"

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 description = "This package provides 26 stemmers for 25 languages generated from Snowball algorithms."
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 python-versions = "*"

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 sphinxcontrib-devhelp = "*"
 sphinxcontrib-htmlhelp = "*"
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 test = ["pytest"]

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@@ -332,6 +557,19 @@ category = "main"
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 [[package]]
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 version = "1.12.1"
@@ -363,9 +601,13 @@ testing = ["pytest (>=3.5,!=3.7.3)", "pytest-checkdocs (>=1.2.3)", "pytest-flake
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 ]
 snowballstemmer = [
    {file = "snowballstemmer-2.0.0-py2.py3-none-any.whl", hash = "sha256:209f257d7533fdb3cb73bdbd24f436239ca3b2fa67d56f6ff88e86be08cc5ef0"},
    {file = "snowballstemmer-2.0.0.tar.gz", hash = "sha256:df3bac3df4c2c01363f3dd2cfa78cce2840a79b9f1c2d2de9ce8d31683992f52"},
 ]
 sphinx = [
    {file = "Sphinx-3.4.1-py3-none-any.whl", hash = "sha256:aeef652b14629431c82d3fe994ce39ead65b3fe87cf41b9a3714168ff8b83376"},
    {file = "Sphinx-3.4.1.tar.gz", hash = "sha256:e450cb205ff8924611085183bf1353da26802ae73d9251a8fcdf220a8f8712ef"},
 ]
 sphinxcontrib-applehelp = [
    {file = "sphinxcontrib-applehelp-1.0.2.tar.gz", hash = "sha256:a072735ec80e7675e3f432fcae8610ecf509c5f1869d17e2eecff44389cdbc58"},
    {file = "sphinxcontrib_applehelp-1.0.2-py2.py3-none-any.whl", hash = "sha256:806111e5e962be97c29ec4c1e7fe277bfd19e9652fb1a4392105b43e01af885a"},
 ]
 sphinxcontrib-devhelp = [
    {file = "sphinxcontrib-devhelp-1.0.2.tar.gz", hash = "sha256:ff7f1afa7b9642e7060379360a67e9c41e8f3121f2ce9164266f61b9f4b338e4"},
    {file = "sphinxcontrib_devhelp-1.0.2-py2.py3-none-any.whl", hash = "sha256:8165223f9a335cc1af7ffe1ed31d2871f325254c0423bc0c4c7cd1c1e4734a2e"},
 ]
 sphinxcontrib-htmlhelp = [
    {file = "sphinxcontrib-htmlhelp-1.0.3.tar.gz", hash = "sha256:e8f5bb7e31b2dbb25b9cc435c8ab7a79787ebf7f906155729338f3156d93659b"},
    {file = "sphinxcontrib_htmlhelp-1.0.3-py2.py3-none-any.whl", hash = "sha256:3c0bc24a2c41e340ac37c85ced6dafc879ab485c095b1d65d2461ac2f7cca86f"},
 ]
 sphinxcontrib-jsmath = [
    {file = "sphinxcontrib-jsmath-1.0.1.tar.gz", hash = "sha256:a9925e4a4587247ed2191a22df5f6970656cb8ca2bd6284309578f2153e0c4b8"},
    {file = "sphinxcontrib_jsmath-1.0.1-py2.py3-none-any.whl", hash = "sha256:2ec2eaebfb78f3f2078e73666b1415417a116cc848b72e5172e596c871103178"},
 ]
 sphinxcontrib-qthelp = [
    {file = "sphinxcontrib-qthelp-1.0.3.tar.gz", hash = "sha256:4c33767ee058b70dba89a6fc5c1892c0d57a54be67ddd3e7875a18d14cba5a72"},
    {file = "sphinxcontrib_qthelp-1.0.3-py2.py3-none-any.whl", hash = "sha256:bd9fc24bcb748a8d51fd4ecaade681350aa63009a347a8c14e637895444dfab6"},
 ]
 sphinxcontrib-serializinghtml = [
    {file = "sphinxcontrib-serializinghtml-1.1.4.tar.gz", hash = "sha256:eaa0eccc86e982a9b939b2b82d12cc5d013385ba5eadcc7e4fed23f4405f77bc"},
    {file = "sphinxcontrib_serializinghtml-1.1.4-py2.py3-none-any.whl", hash = "sha256:f242a81d423f59617a8e5cf16f5d4d74e28ee9a66f9e5b637a18082991db5a9a"},
 ]
 toml = [
    {file = "toml-0.10.2-py2.py3-none-any.whl", hash = "sha256:806143ae5bfb6a3c6e736a764057db0e6a0e05e338b5630894a5f779cabb4f9b"},
    {file = "toml-0.10.2.tar.gz", hash = "sha256:b3bda1d108d5dd99f4a20d24d9c348e91c4db7ab1b749200bded2f839ccbe68f"},
@@ -536,6 +885,10 @@ typing-extensions = [
    {file = "typing_extensions-3.7.4.3-py3-none-any.whl", hash = "sha256:7cb407020f00f7bfc3cb3e7881628838e69d8f3fcab2f64742a5e76b2f841918"},
    {file = "typing_extensions-3.7.4.3.tar.gz", hash = "sha256:99d4073b617d30288f569d3f13d2bd7548c3a7e4c8de87db09a9d29bb3a4a60c"},
 ]
 urllib3 = [
    {file = "urllib3-1.26.2-py2.py3-none-any.whl", hash = "sha256:d8ff90d979214d7b4f8ce956e80f4028fc6860e4431f731ea4a8c08f23f99473"},
    {file = "urllib3-1.26.2.tar.gz", hash = "sha256:19188f96923873c92ccb987120ec4acaa12f0461fa9ce5d3d0772bc965a39e08"},
 ]
 wrapt = [
    {file = "wrapt-1.12.1.tar.gz", hash = "sha256:b62ffa81fb85f4332a4f609cab4ac40709470da05643a082ec1eb88e6d9b97d7"},
 ]
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -25,6 +25,7 @@ pylint = "^2.6.0"
 mypy = "^0.790"
 rope = "^0.18.0"
 yapf = "^0.30.0"
 Sphinx = "^3.4.1"

 [tool.poetry.scripts]
 dds-ci = "dds_ci.main:start"
--- a/src/dds.main.cpp
+++ b/src/dds.main.cpp
@@ -1,12 +1,15 @@
 #include <dds/cli/dispatch_main.hpp>
 #include <dds/cli/options.hpp>
 #include <dds/util/env.hpp>
 #include <dds/util/log.hpp>
 #include <dds/util/output.hpp>
 #include <dds/util/signal.hpp>

 #include <debate/debate.hpp>
 #include <debate/enum.hpp>

 #include <boost/leaf/handle_exception.hpp>
 #include <fansi/styled.hpp>
 #include <fmt/ostream.h>
 #include <neo/event.hpp>

@@ -15,13 +18,15 @@
 #include <iostream>
 #include <locale>

 using namespace fansi::literals;

 static void load_locale() {
    auto lang = std::getenv("LANG");
    auto lang = dds::getenv("LANG");
    if (!lang) {
        return;
    }
    try {
        std::locale::global(std::locale(lang));
        std::locale::global(std::locale(*lang));
    } catch (const std::runtime_error& e) {
        // No locale with the given name
        return;
@@ -35,6 +40,7 @@ int main_fn(std::string_view program_name, const std::vector<std::string>& argv)
    std::setlocale(LC_CTYPE, ".utf8");

    dds::install_signal_handlers();
    dds::enable_ansi_console();

    dds::cli::options       opts;
    debate::argument_parser parser;
@@ -51,12 +57,22 @@ int main_fn(std::string_view program_name, const std::vector<std::string>& argv)
        },
        [&](debate::unrecognized_argument,
            debate::e_argument_parser p,
            debate::e_arg_spelling    arg) {
            debate::e_arg_spelling    arg,
            debate::e_did_you_mean*   dym) {
            std::cerr << p.parser.usage_string(program_name) << '\n';
            if (p.parser.subparsers()) {
                fmt::print(std::cerr, "Unrecognized argument/subcommand: \"{}\"\n", arg.spelling);
                fmt::print(std::cerr,
                           "Unrecognized argument/subcommand: \".bold.red[{}]\"\n"_styled,
                           arg.spelling);
            } else {
                fmt::print(std::cerr, "Unrecognized argument: \"{}\"\n", arg.spelling);
                fmt::print(std::cerr,
                           "Unrecognized argument: \".bold.red[{}]\"\n"_styled,
                           arg.spelling);
            }
            if (dym) {
                fmt::print(std::cerr,
                           "  (Did you mean '.br.yellow[{}]'?)\n"_styled,
                           dym->candidate);
            }
            return 2;
        },
@@ -105,7 +121,8 @@ int main_fn(std::string_view program_name, const std::vector<std::string>& argv)
            return 2;
        },
        [&](debate::invalid_repitition, debate::e_argument_parser p, debate::e_arg_spelling sp) {
            fmt::print(std::cerr << "{}\nArgument '{}' cannot be provided more than once\n",
            fmt::print(std::cerr,
                       "{}\nArgument '{}' cannot be provided more than once\n",
                       p.parser.usage_string(program_name),
                       sp.spelling);
            return 2;
--- a/src/dds/build/builder.cpp
+++ b/src/dds/build/builder.cpp
@@ -11,6 +11,7 @@
 #include <dds/util/time.hpp>

 #include <fansi/styled.hpp>
 #include <fmt/ostream.h>

 #include <array>
 #include <set>
@@ -212,6 +213,95 @@ void write_lmi(build_env_ref env, const build_plan& plan, path_ref base_dir, pat
    }
 }

 void write_lib_cmake(build_env_ref       env,
                     std::ostream&       out,
                     const package_plan& pkg,
                     const library_plan& lib) {
    fmt::print(out, "# Library {}/{}\n", pkg.namespace_(), lib.name());
    auto cmake_name = fmt::format("{}::{}", pkg.namespace_(), lib.name());
    auto cm_kind    = lib.archive_plan().has_value() ? "STATIC" : "INTERFACE";
    fmt::print(
        out,
        "if(TARGET {0})\n"
        "  get_target_property(dds_imported {0} dds_IMPORTED)\n"
        "  if(NOT dds_imported)\n"
        "    message(WARNING [[A target \"{0}\" is already defined, and not by a dds import]])\n"
        "  endif()\n"
        "else()\n",
        cmake_name);
    fmt::print(out,
               "  add_library({0} {1} IMPORTED GLOBAL)\n"
               "  set_property(TARGET {0} PROPERTY dds_IMPORTED TRUE)\n"
               "  set_property(TARGET {0} PROPERTY INTERFACE_INCLUDE_DIRECTORIES [[{2}]])\n",
               cmake_name,
               cm_kind,
               lib.library_().public_include_dir().generic_string());
    for (auto&& use : lib.uses()) {
        fmt::print(out,
                   "  set_property(TARGET {} APPEND PROPERTY INTERFACE_LINK_LIBRARIES {}::{})\n",
                   cmake_name,
                   use.namespace_,
                   use.name);
    }
    for (auto&& link : lib.links()) {
        fmt::print(out,
                   "  set_property(TARGET {} APPEND PROPERTY\n"
                   "               INTERFACE_LINK_LIBRARIES $<LINK_ONLY:{}::{}>)\n",
                   cmake_name,
                   link.namespace_,
                   link.name);
    }
    if (auto& arc = lib.archive_plan()) {
        fmt::print(out,
                   "  set_property(TARGET {} PROPERTY IMPORTED_LOCATION [[{}]])\n",
                   cmake_name,
                   (env.output_root / arc->calc_archive_file_path(env.toolchain)).generic_string());
    }
    fmt::print(out, "endif()\n");
 }

 void write_cmake_pkg(build_env_ref env, std::ostream& out, const package_plan& pkg) {
    fmt::print(out, "## Imports for {}\n", pkg.name());
    for (auto& lib : pkg.libraries()) {
        write_lib_cmake(env, out, pkg, lib);
    }
    fmt::print(out, "\n");
 }

 void write_cmake(build_env_ref env, const build_plan& plan, path_ref cmake_out) {
    fs::create_directories(fs::absolute(cmake_out).parent_path());
    auto out = open(cmake_out, std::ios::binary | std::ios::out);
    out << "## This CMake file was generated by `dds build-deps`. DO NOT EDIT!\n\n";
    for (const auto& pkg : plan.packages()) {
        write_cmake_pkg(env, out, pkg);
    }
 }

 /**
 * @brief Calculate a hash of the directory layout of the given directory.
 *
 * Because a tweaks-dir is specifically designed to have files added/removed within it, and
 * its contents are inspected by `__has_include`, we need to have a way to invalidate any caches
 * when the content of that directory changes. We don't care to hash the contents of the files,
 * since those will already break any caches.
 */
 std::string hash_tweaks_dir(const fs::path& tweaks_dir) {
    if (!fs::is_directory(tweaks_dir)) {
        return "0";  // No tweaks directory, no cache to bust
    }
    std::vector<fs::path> children{fs::recursive_directory_iterator{tweaks_dir},
                                   fs::recursive_directory_iterator{}};
    std::sort(children.begin(), children.end());
    // A really simple inline djb2 hash
    std::uint32_t hash = 5381;
    for (auto& p : children) {
        for (std::uint32_t c : fs::weakly_canonical(p).string()) {
            hash = ((hash << 5) + hash) + c;
        }
    }
    return std::to_string(hash);
 }

 template <typename Func>
 void with_build_plan(const build_params&              params,
                     const std::vector<sdist_target>& sdists,
@@ -227,11 +317,20 @@ void with_build_plan(const build_params&              params,
        params.out_root,
        db,
        toolchain_knobs{
            .is_tty = stdout_is_a_tty(),
            .is_tty     = stdout_is_a_tty(),
            .tweaks_dir = params.tweaks_dir,
        },
        ureqs,
    };

    if (env.knobs.tweaks_dir) {
        env.knobs.cache_buster = hash_tweaks_dir(*env.knobs.tweaks_dir);
        dds_log(trace,
                "Build cache-buster value for tweaks-dir [{}] content is '{}'",
                *env.knobs.tweaks_dir,
                *env.knobs.cache_buster);
    }

    if (st.generate_catch2_main) {
        auto catch_lib                  = prepare_test_driver(params, test_lib::catch_main, env);
        ureqs.add(".dds", "Catch-Main") = catch_lib;
@@ -286,5 +385,9 @@ void builder::build(const build_params& params) const {
        if (params.emit_lmi) {
            write_lmi(env, plan, params.out_root, *params.emit_lmi);
        }

        if (params.emit_cmake) {
            write_cmake(env, plan, *params.emit_cmake);
        }
    });
 }
--- a/src/dds/build/params.hpp
+++ b/src/dds/build/params.hpp
@@ -12,9 +12,11 @@ struct build_params {
    fs::path                out_root;
    std::optional<fs::path> existing_lm_index;
    std::optional<fs::path> emit_lmi;
    std::optional<fs::path> emit_cmake{};
    std::optional<fs::path> tweaks_dir{};
    dds::toolchain          toolchain;
    bool                    generate_compdb = true;
    int                     parallel_jobs   = 0;
 };

 }  // namespace dds
 }  // namespace dds
--- a/src/dds/cli/cmd/build.cpp
+++ b/src/dds/cli/cmd/build.cpp
@@ -30,6 +30,7 @@ int build(const options& opts) {
        .out_root          = opts.out_path.value_or(fs::current_path() / "_build"),
        .existing_lm_index = opts.build.lm_index,
        .emit_lmi          = {},
        .tweaks_dir        = opts.build.tweaks_dir,
        .toolchain         = opts.load_toolchain(),
        .parallel_jobs     = opts.jobs,
    });
--- a/src/dds/cli/cmd/build_deps.cpp
+++ b/src/dds/cli/cmd/build_deps.cpp
@@ -17,6 +17,8 @@ int build_deps(const options& opts) {
        .out_root          = opts.out_path.value_or(fs::current_path() / "_deps"),
        .existing_lm_index = {},
        .emit_lmi          = opts.build.lm_index.value_or("INDEX.lmi"),
        .emit_cmake        = opts.build_deps.cmake_file,
        .tweaks_dir        = opts.build.tweaks_dir,
        .toolchain         = opts.load_toolchain(),
        .parallel_jobs     = opts.jobs,
    };
--- a/src/dds/cli/cmd/compile_file.cpp
+++ b/src/dds/cli/cmd/compile_file.cpp
@@ -11,6 +11,7 @@ int compile_file(const options& opts) {
                              .out_root = opts.out_path.value_or(fs::current_path() / "_build"),
                              .existing_lm_index = opts.build.lm_index,
                              .emit_lmi          = {},
                              .tweaks_dir        = opts.build.tweaks_dir,
                              .toolchain         = opts.load_toolchain(),
                              .parallel_jobs     = opts.jobs,
                          });
--- a/src/dds/cli/cmd/install_yourself.cpp
+++ b/src/dds/cli/cmd/install_yourself.cpp
@@ -0,0 +1,433 @@
 #include "../options.hpp"

 #include <dds/util/env.hpp>
 #include <dds/util/fs.hpp>
 #include <dds/util/paths.hpp>
 #include <dds/util/result.hpp>
 #include <dds/util/string.hpp>

 #include <boost/leaf/handle_exception.hpp>
 #include <fansi/styled.hpp>
 #include <neo/assert.hpp>
 #include <neo/platform.hpp>
 #include <neo/scope.hpp>

 #ifdef __APPLE__
 #include <mach-o/dyld.h>
 #elif __FreeBSD__
 #include <sys/sysctl.h>
 #elif _WIN32
 #include <windows.h>
 // Must be included second:
 #include <wil/resource.h>
 #endif

 using namespace fansi::literals;

 namespace dds::cli::cmd {

 namespace {

 fs::path current_executable() {
 #if __linux__
    return fs::read_symlink("/proc/self/exe");
 #elif __APPLE__
    std::uint32_t len = 0;
    _NSGetExecutablePath(nullptr, &len);
    std::string buffer;
    buffer.resize(len + 1);
    auto rc = _NSGetExecutablePath(buffer.data(), &len);
    neo_assert(invariant, rc == 0, "Unexpected error from _NSGetExecutablePath()");
    return fs::canonical(buffer);
 #elif __FreeBSD__
    std::string buffer;
    int         mib[] = {CTRL_KERN, KERN_PROC, KERN_PROC_PATHNAME, -1};
    std::size_t len   = 0;
    auto        rc    = ::sysctl(mib, 4, nullptr, &len, nullptr, 0);
    neo_assert(invariant,
               rc == 0,
               "Unexpected error from ::sysctl() while getting executable path",
               errno);
    buffer.resize(len + 1);
    rc = ::sysctl(mib, 4, buffer.data(), &len, nullptr, 0);
    neo_assert(invariant,
               rc == 0,
               "Unexpected error from ::sysctl() while getting executable path",
               errno);
    return fs::canonical(nullptr);
 #elif _WIN32
    std::wstring buffer;
    while (true) {
        buffer.resize(buffer.size() + 32);
        auto reallen
            = ::GetModuleFileNameW(nullptr, buffer.data(), static_cast<DWORD>(buffer.size()));
        if (reallen == buffer.size() && ::GetLastError() == ERROR_INSUFFICIENT_BUFFER) {
            continue;
        }
        buffer.resize(reallen);
        return fs::canonical(buffer);
    }
 #else
 #error "No method of getting the current executable path is implemented on this system. FIXME!"
 #endif
 }

 fs::path user_binaries_dir() noexcept {
 #if _WIN32
    return dds::user_data_dir() / "bin";
 #else
    return dds::user_home_dir() / ".local/bin";
 #endif
 }

 fs::path system_binaries_dir() noexcept {
 #if _WIN32
    return "C:/bin";
 #else
    return "/usr/local/bin";
 #endif
 }

 #if _WIN32
 void fixup_path_env(const options& opts, const wil::unique_hkey& env_hkey, fs::path want_path) {
    DWORD len = 0;
    // Get the length
    auto err = ::RegGetValueW(env_hkey.get(),
                              nullptr,
                              L"PATH",
                              RRF_RT_REG_EXPAND_SZ | RRF_RT_REG_SZ | RRF_NOEXPAND,
                              nullptr,
                              nullptr,
                              &len);
    if (err != ERROR_SUCCESS) {
        throw std::system_error(std::error_code(err, std::system_category()),
                                "Failed to access PATH environment variable [1]");
    }
    // Now get the value
    std::wstring buffer;
    buffer.resize(len / 2);
    err = ::RegGetValueW(env_hkey.get(),
                         nullptr,
                         L"PATH",
                         RRF_RT_REG_EXPAND_SZ | RRF_RT_REG_SZ | RRF_NOEXPAND,
                         nullptr,
                         buffer.data(),
                         &len);
    if (err != ERROR_SUCCESS) {
        throw std::system_error(std::error_code(err, std::system_category()),
                                "Failed to access PATH environment variable [2]");
    }
    // Strip null-term
    buffer.resize(len);
    while (!buffer.empty() && buffer.back() == 0) {
        buffer.pop_back();
    }
    // Check if we need to append the user-local binaries dir to the path
    const auto want_entry   = fs::path(want_path).make_preferred().lexically_normal();
    const auto path_env_str = fs::path(buffer).string();
    auto       path_elems   = split_view(path_env_str, ";");
    const bool any_match    = std::any_of(path_elems.cbegin(), path_elems.cend(), [&](auto view) {
        auto existing = fs::weakly_canonical(view).make_preferred().lexically_normal();
        dds_log(trace, "Existing PATH entry: '{}'", existing.string());
        return existing.native() == want_entry.native();
    });
    if (any_match) {
        dds_log(info, "PATH is up-to-date");
        return;
    }
    if (opts.dry_run) {
        dds_log(info, "The PATH environment variable would be modified.");
        return;
    }
    // It's not there. Add it now.
    auto want_str = want_entry.string();
    path_elems.insert(path_elems.begin(), want_str);
    auto joined = joinstr(";", path_elems);
    buffer      = fs::path(joined).native();
    // Put the new PATH entry back into the environment
    err = ::RegSetValueExW(env_hkey.get(),
                           L"Path",
                           0,
                           REG_EXPAND_SZ,
                           reinterpret_cast<const BYTE*>(buffer.data()),
                           (buffer.size() + 1) * 2);
    if (err != ERROR_SUCCESS) {
        throw std::system_error(std::error_code(err, std::system_category()),
                                "Failed to modify PATH environment variable");
    }
    dds_log(
        info,
        "The directory [.br.cyan[{}]] has been added to your PATH environment variables."_styled,
        want_path.string());
    dds_log(
        info,
        ".bold.cyan[NOTE:] You may need to restart running applications to see this change!"_styled);
 }
 #endif

 void fixup_system_path(const options& opts [[maybe_unused]]) {
 #if !_WIN32
 // We install into /usr/local/bin, and every nix-like system we support already has that on the
 // global PATH
 #else  // Windows!
    wil::unique_hkey env_hkey;
    auto             err = ::RegOpenKeyExW(HKEY_LOCAL_MACHINE,
                               L"SYSTEM\\CurrentControlSet\\Control\\Session Manager\\Environment",
                               0,
                               KEY_WRITE | KEY_READ,
                               &env_hkey);
    if (err != ERROR_SUCCESS) {
        throw std::system_error(std::error_code(err, std::system_category()),
                                "Failed to open user-local environment variables registry "
                                "entry");
    }
    fixup_path_env(opts, env_hkey, "C:/bin");
 #endif
 }

 void fixup_user_path(const options& opts) {
 #if !_WIN32
    auto profile_file    = dds::user_home_dir() / ".profile";
    auto profile_content = dds::slurp_file(profile_file);
    if (dds::contains(profile_content, "$HOME/.local/bin")) {
        // We'll assume that this is properly loading .local/bin for .profile
        dds_log(info, "[.br.cyan[{}]] is okay"_styled, profile_file.string());
    } else if (opts.dry_run) {
        dds_log(info,
                "Would update [.br.cyan[{}]] to have ~/.local/bin on $PATH"_styled,
                profile_file.string());
    } else {
        // Let's add it
        profile_content
            += ("\n# This entry was added by 'dds install-yourself' for the user-local "
                "binaries path\nPATH=$HOME/bin:$HOME/.local/bin:$PATH\n");
        dds_log(info,
                "Updating [.br.cyan[{}]] with a user-local binaries PATH entry"_styled,
                profile_file.string());
        auto tmp_file = profile_file;
        tmp_file += ".tmp";
        auto bak_file = profile_file;
        bak_file += ".bak";
        // Move .profile back into place if we abore for any reason
        neo_defer {
            if (!fs::exists(profile_file)) {
                safe_rename(bak_file, profile_file);
            }
        };
        // Write the temporary version
        dds::write_file(tmp_file, profile_content).value();
        // Make a backup
        safe_rename(profile_file, bak_file);
        // Move the tmp over the final location
        safe_rename(tmp_file, profile_file);
        // Okay!
        dds_log(info,
                "[.br.green[{}]] was updated. Prior contents are safe in [.br.cyan[{}]]"_styled,
                profile_file.string(),
                bak_file.string());
        dds_log(
            info,
            ".bold.cyan[NOTE:] Running applications may need to be restarted to see this change"_styled);
    }

    auto fish_config = dds::user_config_dir() / "fish/config.fish";
    if (fs::exists(fish_config)) {
        auto fish_config_content = slurp_file(fish_config);
        if (dds::contains(fish_config_content, "$HOME/.local/bin")) {
            // Assume that this is up-to-date
            dds_log(info,
                    "Fish configuration in [.br.cyan[{}]] is okay"_styled,
                    fish_config.string());
        } else if (opts.dry_run) {
            dds_log(info,
                    "Would update [.br.cyan[{}]] to have ~/.local/bin on $PATH"_styled,
                    fish_config.string());
        } else {
            dds_log(
                info,
                "Updating Fish shell configuration [.br.cyan[{}]] with user-local binaries PATH entry"_styled,
                fish_config.string());
            fish_config_content
                += ("\n# This line was added by 'dds install-yourself' to add the user-local "
                    "binaries directory to $PATH\nset -x PATH $PATH \"$HOME/.local/bin\"\n");
            auto tmp_file = fish_config;
            auto bak_file = fish_config;
            tmp_file += ".tmp";
            bak_file += ".bak";
            neo_defer {
                if (!fs::exists(fish_config)) {
                    safe_rename(bak_file, fish_config);
                }
            };
            // Write the temporary version
            dds::write_file(tmp_file, fish_config_content).value();
            // Make a backup
            safe_rename(fish_config, bak_file);
            // Move the temp over the destination
            safe_rename(tmp_file, fish_config);
            // Okay!
            dds_log(info,
                    "[.br.green[{}]] was updated. Prior contents are safe in [.br.cyan[{}]]"_styled,
                    fish_config.string(),
                    bak_file.string());
            dds_log(
                info,
                ".bold.cyan[NOTE:] Running Fish shells will need to be restartred to see this change"_styled);
        }
    }
 #else  // _WIN32
    wil::unique_hkey env_hkey;
    auto             err
        = ::RegOpenKeyExW(HKEY_CURRENT_USER, L"Environment", 0, KEY_WRITE | KEY_READ, &env_hkey);
    if (err != ERROR_SUCCESS) {
        throw std::system_error(std::error_code(err, std::system_category()),
                                "Failed to open user-local environment variables registry "
                                "entry");
    }
    fixup_path_env(opts, env_hkey, "%LocalAppData%/bin");
 #endif
 }

 void fixup_path(const options& opts) {
    if (opts.install_yourself.where == opts.install_yourself.system) {
        fixup_system_path(opts);
    } else {
        fixup_user_path(opts);
    }
 }

 int _install_yourself(const options& opts) {
    auto self_exe = current_executable();

    auto dest_dir = opts.install_yourself.where == opts.install_yourself.user
        ? user_binaries_dir()
        : system_binaries_dir();

    auto dest_path = dest_dir / "dds";
    if constexpr (neo::os_is_windows) {
        dest_path += ".exe";
    }

    if (fs::absolute(dest_path).lexically_normal() == fs::canonical(self_exe)) {
        dds_log(error,
                "We cannot install over our own executable (.br.red[{}])"_styled,
                self_exe.string());
        return 1;
    }

    if (!fs::is_directory(dest_dir)) {
        if (opts.dry_run) {
            dds_log(info, "Would create directory [.br.cyan[{}]]"_styled, dest_dir.string());
        } else {
            dds_log(info, "Creating directory [.br.cyan[{}]]"_styled, dest_dir.string());
            fs::create_directories(dest_dir);
        }
    }

    if (opts.dry_run) {
        if (fs::is_symlink(dest_path)) {
            dds_log(info, "Would remove symlink [.br.cyan[{}]]"_styled, dest_path.string());
        }
        if (fs::exists(dest_path) && !fs::is_symlink(dest_path)) {
            if (opts.install_yourself.symlink) {
                dds_log(
                    info,
                    "Would overwrite .br.yellow[{0}] with a symlink .br.green[{0}] -> .br.cyan[{1}]"_styled,
                    dest_path.string(),
                    self_exe.string());
            } else {
                dds_log(info,
                        "Would overwrite .br.yellow[{}] with [.br.cyan[{}]]"_styled,
                        dest_path.string(),
                        self_exe.string());
            }
        } else {
            if (opts.install_yourself.symlink) {
                dds_log(info,
                        "Would create a symlink [.br.green[{}]] -> [.br.cyan[{}]]"_styled,
                        dest_path.string(),
                        self_exe.string());
            } else {
                dds_log(info,
                        "Would install [.br.cyan[{}]] to .br.yellow[{}]"_styled,
                        self_exe.string(),
                        dest_path.string());
            }
        }
    } else {
        if (fs::is_symlink(dest_path)) {
            dds_log(info, "Removing old symlink file [.br.cyan[{}]]"_styled, dest_path.string());
            dds::remove_file(dest_path).value();
        }
        if (opts.install_yourself.symlink) {
            if (fs::exists(dest_path)) {
                dds_log(info, "Removing previous file [.br.cyan[{}]]"_styled, dest_path.string());
                dds::remove_file(dest_path).value();
            }
            dds_log(info,
                    "Creating symbolic link [.br.green[{}]] -> [.br.cyan[{}]]"_styled,
                    dest_path.string(),
                    self_exe.string());
            dds::create_symlink(self_exe, dest_path).value();
        } else {
            dds_log(info,
                    "Installing [.br.cyan[{}]] to [.br.green[{}]]"_styled,
                    self_exe.string(),
                    dest_path.string());
            dds::copy_file(self_exe, dest_path, fs::copy_options::overwrite_existing).value();
        }
    }

    if (opts.install_yourself.fixup_path_env) {
        fixup_path(opts);
    }

    if (!opts.dry_run) {
        dds_log(info, "Success!");
    }
    return 0;
 }

 }  // namespace

 int install_yourself(const options& opts) {
    return boost::leaf::try_catch(
        [&] {
            try {
                return _install_yourself(opts);
            } catch (...) {
                capture_exception();
            }
        },
        [](std::error_code ec, e_copy_file copy) {
            dds_log(error,
                    "Failed to copy file [.br.cyan[{}]] to .br.yellow[{}]: .bold.red[{}]"_styled,
                    copy.source.string(),
                    copy.dest.string(),
                    ec.message());
            return 1;
        },
        [](std::error_code ec, e_remove_file file) {
            dds_log(error,
                    "Failed to delete file .br.yellow[{}]: .bold.red[{}]"_styled,
                    file.value.string(),
                    ec.message());
            return 1;
        },
        [](std::error_code ec, e_symlink oper) {
            dds_log(
                error,
                "Failed to create symlink from .br.yellow[{}] to [.br.cyan[{}]]: .bold.red[{}]"_styled,
                oper.symlink.string(),
                oper.target.string(),
                ec.message());
            return 1;
        },
        [](e_system_error_exc e) {
            dds_log(error, "Failure while installing: {}", e.message);
            return 1;
        });
    return 0;
 }

 }  // namespace dds::cli::cmd
--- a/src/dds/cli/cmd/sdist_create.cpp
+++ b/src/dds/cli/cmd/sdist_create.cpp
@@ -5,11 +5,14 @@

 #include <boost/leaf/common.hpp>
 #include <boost/leaf/handle_exception.hpp>
 #include <fansi/styled.hpp>
 #include <fmt/core.h>

 using namespace fansi::literals;

 namespace dds::cli::cmd {

 int sdist_create(const options& opts) {
 int pkg_create(const options& opts) {
    dds::sdist_params params{
        .project_dir   = opts.project_dir,
        .dest_path     = {},
@@ -23,20 +26,27 @@ int sdist_create(const options& opts) {
            auto default_filename = fmt::format("{}.tar.gz", pkg_man.id.to_string());
            auto filepath         = opts.out_path.value_or(fs::current_path() / default_filename);
            create_sdist_targz(filepath, params);
            dds_log(info,
                    "Created source dirtribution archive: .bold.cyan[{}]"_styled,
                    filepath.string());
            return 0;
        },
        [&](boost::leaf::bad_result, e_missing_file missing, e_human_message msg) {
            dds_log(error,
                    "A required file is missing for creating a source distribution for [{}]",
                    params.project_dir.string());
            dds_log(error, "Error: {}", msg.value);
            dds_log(error, "Missing file: {}", missing.path.string());
            dds_log(
                error,
                "A required file is missing for creating a source distribution for [.bold.yellow[{}]]"_styled,
                params.project_dir.string());
            dds_log(error, "Error: .bold.yellow[{}]"_styled, msg.value);
            dds_log(error, "Missing file: .bold.red[{}]"_styled, missing.path.string());
            write_error_marker("no-package-json5");
            return 1;
        },
        [&](std::error_code ec, e_human_message msg, boost::leaf::e_file_name file) {
            dds_log(error, "Error: {}", msg.value);
            dds_log(error, "Failed to access file [{}]: {}", file.value, ec.message());
            dds_log(error, "Error: .bold.red[{}]"_styled, msg.value);
            dds_log(error,
                    "Failed to access file [.bold.red[{}]]: .br.yellow[{}]"_styled,
                    file.value,
                    ec.message());
            write_error_marker("failed-package-json5-scan");
            return 1;
        });
--- a/src/dds/cli/cmd/pkg_import.cpp
+++ b/src/dds/cli/cmd/pkg_import.cpp
@@ -5,6 +5,7 @@
 #include <dds/util/result.hpp>

 #include <boost/leaf/handle_exception.hpp>
 #include <fansi/styled.hpp>
 #include <json5/parse_data.hpp>
 #include <neo/assert.hpp>
 #include <neo/url/parse.hpp>
@@ -12,25 +13,40 @@
 #include <iostream>
 #include <string_view>

 using namespace fansi::literals;

 namespace dds::cli::cmd {

 struct e_importing {
    std::string value;
 };

 static int _pkg_import(const options& opts) {
    return pkg_cache::with_cache(  //
        opts.pkg_cache_dir.value_or(pkg_cache::default_local_path()),
        pkg_cache_flags::write_lock | pkg_cache_flags::create_if_absent,
        [&](auto repo) {
            for (std::string_view tgz_where : opts.pkg.import.items) {
                neo_assertion_breadcrumbs("Importing sdist", tgz_where);
                auto tmp_sd
                    = (tgz_where.starts_with("http://") || tgz_where.starts_with("https://"))
                    ? download_expand_sdist_targz(tgz_where)
                    : expand_sdist_targz(tgz_where);
                neo_assertion_breadcrumbs("Importing from temporary directory",
                                          tmp_sd.tmpdir.path());
                repo.add_sdist(tmp_sd.sdist, dds::if_exists(opts.if_exists));
            // Lambda to import an sdist object
            auto import_sdist
                = [&](const sdist& sd) { repo.import_sdist(sd, dds::if_exists(opts.if_exists)); };

            for (std::string_view sdist_where : opts.pkg.import.items) {
                DDS_E_SCOPE(e_importing{std::string(sdist_where)});
                neo_assertion_breadcrumbs("Importing sdist", sdist_where);
                if (sdist_where.starts_with("http://") || sdist_where.starts_with("https://")) {
                    auto tmp_sd = download_expand_sdist_targz(sdist_where);
                    import_sdist(tmp_sd.sdist);
                } else if (fs::is_directory(sdist_where)) {
                    auto sd = sdist::from_directory(sdist_where);
                    import_sdist(sd);
                } else {
                    auto tmp_sd = expand_sdist_targz(sdist_where);
                    import_sdist(tmp_sd.sdist);
                }
            }
            if (opts.pkg.import.from_stdin) {
                auto tmp_sd = dds::expand_sdist_from_istream(std::cin, "<stdin>");
                repo.add_sdist(tmp_sd.sdist, dds::if_exists(opts.if_exists));
                repo.import_sdist(tmp_sd.sdist, dds::if_exists(opts.if_exists));
            }
            return 0;
        });
@@ -52,6 +68,14 @@ int pkg_import(const options& opts) {
        [](dds::e_sqlite3_error_exc e) {
            dds_log(error, "Unexpected database error: {}", e.message);
            return 1;
        },
        [](e_system_error_exc err, e_importing what) {
            dds_log(
                error,
                "Error while importing source distribution from [.bold.red[{}]]: .br.yellow[{}]"_styled,
                what.value,
                err.message);
            return 1;
        });
 }
 }  // namespace dds::cli::cmd
--- a/src/dds/cli/cmd/pkg_repo_ls.cpp
+++ b/src/dds/cli/cmd/pkg_repo_ls.cpp
@@ -13,7 +13,7 @@ static int _pkg_repo_ls(const options& opts) {
    auto                       pkg_db = opts.open_pkg_db();
    neo::sqlite3::database_ref db     = pkg_db.database();

    auto st   = db.prepare("SELECT name, remote_url, db_mtime FROM dds_pkg_remotes");
    auto st   = db.prepare("SELECT name, url, db_mtime FROM dds_pkg_remotes");
    auto tups = neo::sqlite3::iter_tuples<std::string, std::string, std::optional<std::string>>(st);
    for (auto [name, remote_url, mtime] : tups) {
        fmt::print("Remote '{}':\n", name);
--- a/src/dds/cli/cmd/pkg_search.cpp
+++ b/src/dds/cli/cmd/pkg_search.cpp
@@ -0,0 +1,60 @@
 #include "../options.hpp"

 #include <dds/error/nonesuch.hpp>
 #include <dds/pkg/db.hpp>
 #include <dds/pkg/search.hpp>
 #include <dds/util/result.hpp>
 #include <dds/util/string.hpp>

 #include <boost/leaf/handle_exception.hpp>
 #include <fansi/styled.hpp>
 #include <fmt/format.h>
 #include <range/v3/view/transform.hpp>

 using namespace fansi::literals;

 namespace dds::cli::cmd {

 static int _pkg_search(const options& opts) {
    auto cat     = opts.open_pkg_db();
    auto results = *dds::pkg_search(cat.database(), opts.pkg.search.pattern);
    for (pkg_group_search_result const& found : results.found) {
        fmt::print(
            "    Name: .bold[{}]\n"
            "Versions: .bold[{}]\n"
            "    From: .bold[{}]\n"
            "          .bold[{}]\n\n"_styled,
            found.name,
            joinstr(", ", found.versions | ranges::views::transform(&semver::version::to_string)),
            found.remote_name,
            found.description);
    }

    if (results.found.empty()) {
        dds_log(error,
                "There are no packages that match the given pattern \".bold.red[{}]\""_styled,
                opts.pkg.search.pattern.value_or("*"));
        write_error_marker("pkg-search-no-result");
        return 1;
    }
    return 0;
 }

 int pkg_search(const options& opts) {
    return boost::leaf::try_catch(
        [&] {
            try {
                return _pkg_search(opts);
            } catch (...) {
                capture_exception();
            }
        },
        [](e_nonesuch missing) {
            missing.log_error(
                "There are no packages that match the given pattern \".bold.red[{}]\""_styled);
            write_error_marker("pkg-search-no-result");
            return 1;
        });
 }

 }  // namespace dds::cli::cmd
--- a/src/dds/cli/cmd/repoman_add.cpp
+++ b/src/dds/cli/cmd/repoman_add.cpp
@@ -14,16 +14,15 @@
 namespace dds::cli::cmd {

 static int _repoman_add(const options& opts) {
    auto             pkg_id = dds::pkg_id::parse(opts.repoman.add.pkg_id_str);
    auto             rpkg   = any_remote_pkg::from_url(neo::url::parse(opts.repoman.add.url_str));
    auto rpkg       = any_remote_pkg::from_url(neo::url::parse(opts.repoman.add.url_str));
    auto temp_sdist = get_package_sdist(rpkg);

    dds::pkg_listing add_info{
        .ident       = pkg_id,
        .ident       = temp_sdist.sdist.manifest.id,
        .deps        = temp_sdist.sdist.manifest.dependencies,
        .description = opts.repoman.add.description,
        .remote_pkg  = rpkg,
    };
    auto temp_sdist = get_package_sdist(add_info);

    add_info.deps = temp_sdist.sdist.manifest.dependencies;

    auto repo = repo_manager::open(opts.repoman.repo_dir);
    repo.add_pkg(add_info, opts.repoman.add.url_str);
@@ -39,22 +38,6 @@ int repoman_add(const options& opts) {
                dds::capture_exception();
            }
        },
        [](user_error<errc::invalid_pkg_id>,
           semver::invalid_version   err,
           dds::e_invalid_pkg_id_str idstr) -> int {
            dds_log(error,
                    "Package ID string '{}' is invalid, because '{}' is not a valid semantic "
                    "version string",
                    idstr.value,
                    err.string());
            write_error_marker("invalid-pkg-id-str-version");
            throw;
        },
        [](user_error<errc::invalid_pkg_id>, dds::e_invalid_pkg_id_str idstr) -> int {
            dds_log(error, "Invalid package ID string '{}'", idstr.value);
            write_error_marker("invalid-pkg-id-str");
            throw;
        },
        [](dds::e_sqlite3_error_exc,
           boost::leaf::match<neo::sqlite3::errc, neo::sqlite3::errc::constraint_unique>,
           dds::pkg_id pkid) {
--- a/src/dds/cli/dispatch_main.cpp
+++ b/src/dds/cli/dispatch_main.cpp
@@ -16,6 +16,8 @@ using command = int(const options&);
 command build_deps;
 command build;
 command compile_file;
 command install_yourself;
 command pkg_create;
 command pkg_get;
 command pkg_import;
 command pkg_ls;
@@ -23,12 +25,12 @@ command pkg_repo_add;
 command pkg_repo_update;
 command pkg_repo_ls;
 command pkg_repo_remove;
 command pkg_search;
 command repoman_add;
 command repoman_import;
 command repoman_init;
 command repoman_ls;
 command repoman_remove;
 command sdist_create;

 }  // namespace cmd

@@ -38,20 +40,13 @@ int dispatch_main(const options& opts) noexcept {
        switch (opts.subcommand) {
        case subcommand::build:
            return cmd::build(opts);
        case subcommand::sdist: {
            DDS_E_SCOPE(opts.sdist.subcommand);
            switch (opts.sdist.subcommand) {
            case sdist_subcommand::create:
                return cmd::sdist_create(opts);
            case sdist_subcommand::_none_:;
            }
            neo::unreachable();
        }
        case subcommand::pkg: {
            DDS_E_SCOPE(opts.pkg.subcommand);
            switch (opts.pkg.subcommand) {
            case pkg_subcommand::ls:
                return cmd::pkg_ls(opts);
            case pkg_subcommand::create:
                return cmd::pkg_create(opts);
            case pkg_subcommand::get:
                return cmd::pkg_get(opts);
            case pkg_subcommand::import:
@@ -71,6 +66,8 @@ int dispatch_main(const options& opts) noexcept {
                }
                neo::unreachable();
            }
            case pkg_subcommand::search:
                return cmd::pkg_search(opts);
            case pkg_subcommand::_none_:;
            }
            neo::unreachable();
@@ -96,6 +93,8 @@ int dispatch_main(const options& opts) noexcept {
            return cmd::compile_file(opts);
        case subcommand::build_deps:
            return cmd::build_deps(opts);
        case subcommand::install_yourself:
            return cmd::install_yourself(opts);
        case subcommand::_none_:;
        }
        neo::unreachable();
--- a/src/dds/cli/error_handler.cpp
+++ b/src/dds/cli/error_handler.cpp
@@ -2,6 +2,8 @@
 #include "./options.hpp"

 #include <dds/error/errors.hpp>
 #include <dds/error/toolchain.hpp>
 #include <dds/util/http/pool.hpp>
 #include <dds/util/log.hpp>
 #include <dds/util/result.hpp>
 #include <dds/util/signal.hpp>
@@ -10,6 +12,7 @@
 #include <boost/leaf/handle_error.hpp>
 #include <boost/leaf/handle_exception.hpp>
 #include <boost/leaf/result.hpp>
 #include <fansi/styled.hpp>
 #include <fmt/ostream.h>
 #include <json5/parse_data.hpp>
 #include <neo/scope.hpp>
@@ -18,6 +21,7 @@
 #include <fstream>

 using namespace dds;
 using namespace fansi::literals;

 namespace {

@@ -55,6 +59,32 @@ auto handlers = std::tuple(  //
        dds_log(critical, "Operation cancelled by the user");
        return 2;
    },
    [](e_system_error_exc e, neo::url url, http_response_info) {
        dds_log(error,
                "An error occured while downloading [.bold.red[{}]]: {}"_styled,
                url.to_string(),
                e.message);
        return 1;
    },
    [](e_system_error_exc e, network_origin origin, neo::url* url) {
        dds_log(error,
                "Network error communicating with .bold.red[{}://{}:{}]: {}"_styled,
                origin.protocol,
                origin.hostname,
                origin.port,
                e.message);
        if (url) {
            dds_log(error, "  (While accessing URL [.bold.red[{}]])"_styled, url->to_string());
        }
        return 1;
    },
    [](e_system_error_exc err, e_loading_toolchain, e_toolchain_file* tc_file) {
        dds_log(error, "Failed to load toolchain: .br.yellow[{}]"_styled, err.message);
        if (tc_file) {
            dds_log(error, "  (While loading from file [.bold.red[{}]])"_styled, tc_file->value);
        }
        return 1;
    },
    [](e_system_error_exc exc, boost::leaf::verbose_diagnostic_info const& diag) {
        dds_log(critical,
                "An unhandled std::system_error arose. THIS IS A DDS BUG! Info: {}",
@@ -69,5 +99,13 @@ auto handlers = std::tuple(  //
 }  // namespace

 int dds::handle_cli_errors(std::function<int()> fn) noexcept {
    return boost::leaf::try_catch(fn, handlers);
    return boost::leaf::try_catch(
        [&] {
            try {
                return fn();
            } catch (...) {
                capture_exception();
            }
        },
        handlers);
 }
--- a/src/dds/cli/options.cpp
+++ b/src/dds/cli/options.cpp
@@ -1,14 +1,18 @@
 #include "./options.hpp"

 #include <dds/error/errors.hpp>
 #include <dds/error/on_error.hpp>
 #include <dds/error/toolchain.hpp>
 #include <dds/pkg/db.hpp>
 #include <dds/toolchain/from_json.hpp>
 #include <dds/toolchain/toolchain.hpp>

 #include <debate/enum.hpp>
 #include <fansi/styled.hpp>

 using namespace dds;
 using namespace debate;
 using namespace fansi::literals;

 namespace {

@@ -86,6 +90,17 @@ struct setup {
        .action   = put_into(opts.repoman.repo_dir),
    };

    argument tweaks_dir_arg{
        .long_spellings  = {"tweaks-dir"},
        .short_spellings = {"TD"},
        .help
        = "Base directory of "
          "\x1b]8;;https://vector-of-bool.github.io/2020/10/04/lib-configuration.html\x1b\\tweak "
          "headers\x1b]8;;\x1b\\ that should be available to the build.",
        .valname = "<dir>",
        .action  = put_into(opts.build.tweaks_dir),
    };

    void do_setup(argument_parser& parser) noexcept {
        parser.add_argument({
            .long_spellings  = {"log-level"},
@@ -142,14 +157,14 @@ struct setup {
            .name = "pkg",
            .help = "Manage packages and package remotes",
        }));
        setup_sdist_cmd(group.add_parser({
            .name = "sdist",
            .help = "Work with source distribution packages",
        }));
        setup_repoman_cmd(group.add_parser({
            .name = "repoman",
            .help = "Manage a dds package repository",
        }));
        setup_install_yourself_cmd(group.add_parser({
            .name = "install-yourself",
            .help = "Have this dds executable install itself onto your PATH",
        }));
    }

    void setup_build_cmd(argument_parser& build_cmd) {
@@ -189,6 +204,7 @@ struct setup {
        build_cmd.add_argument(lm_index_arg.dup()).help
            = "Path to a libman index file to use for loading project dependencies";
        build_cmd.add_argument(jobs_arg.dup());
        build_cmd.add_argument(tweaks_dir_arg.dup());
    }

    void setup_compile_file_cmd(argument_parser& compile_file_cmd) noexcept {
@@ -199,6 +215,7 @@ struct setup {
            = "Set the maximum number of files to compile in parallel";
        compile_file_cmd.add_argument(lm_index_arg.dup());
        compile_file_cmd.add_argument(out_arg.dup());
        compile_file_cmd.add_argument(tweaks_dir_arg.dup());
        compile_file_cmd.add_argument({
            .help       = "One or more source files to compile",
            .valname    = "<source-files>",
@@ -221,6 +238,14 @@ struct setup {
            .can_repeat      = true,
            .action          = debate::push_back_onto(opts.build_deps.deps_files),
        });
        build_deps_cmd.add_argument({
            .long_spellings = {"cmake"},
            .help = "Generate a CMake file at the given path that will create import targets for "
                    "the dependencies",
            .valname = "<file-path>",
            .action  = debate::put_into(opts.build_deps.cmake_file),
        });
        build_deps_cmd.add_argument(tweaks_dir_arg.dup());
        build_deps_cmd.add_argument({
            .help       = "Dependency statement strings",
            .valname    = "<dependency>",
@@ -234,18 +259,22 @@ struct setup {
            .valname = "<pkg-subcommand>",
            .action  = put_into(opts.pkg.subcommand),
        });
        setup_pkg_init_db_cmd(pkg_group.add_parser({
            .name = "init-db",
            .help = "Initialize a new package database file (Path specified with '--pkg-db-path')",
        }));
        pkg_group.add_parser({
            .name = "ls",
            .help = "List locally available packages",
        });
        setup_pkg_create_cmd(pkg_group.add_parser({
            .name = "create",
            .help = "Create a source distribution archive of a project",
        }));
        setup_pkg_get_cmd(pkg_group.add_parser({
            .name = "get",
            .help = "Obtain a copy of a package from a remote",
        }));
        setup_pkg_init_db_cmd(pkg_group.add_parser({
            .name = "init-db",
            .help = "Initialize a new package database file (Path specified with '--pkg-db-path')",
        }));
        setup_pkg_import_cmd(pkg_group.add_parser({
            .name = "import",
            .help = "Import a source distribution archive into the local package cache",
@@ -254,6 +283,20 @@ struct setup {
            .name = "repo",
            .help = "Manage package repositories",
        }));
        setup_pkg_search_cmd(pkg_group.add_parser({
            .name = "search",
            .help = "Search for packages available to download",
        }));
    }

    void setup_pkg_create_cmd(argument_parser& pkg_create_cmd) {
        pkg_create_cmd.add_argument(project_arg.dup()).help
            = "Path to the project for which to create a source distribution.\n"
              "Default is the current working directory.";
        pkg_create_cmd.add_argument(out_arg.dup()).help
            = "Destination path for the source distributioon archive";
        pkg_create_cmd.add_argument(if_exists_arg.dup()).help
            = "What to do if the destination names an existing file";
    }

    void setup_pkg_get_cmd(argument_parser& pkg_get_cmd) {
@@ -339,25 +382,16 @@ struct setup {
            = "What to do if any of the named repositories do not exist";
    }

    void setup_sdist_cmd(argument_parser& sdist_cmd) noexcept {
        auto& sdist_grp = sdist_cmd.add_subparsers({
            .valname = "<sdist-subcommand>",
            .action  = put_into(opts.sdist.subcommand),
    void setup_pkg_search_cmd(argument_parser& pkg_repo_search_cmd) noexcept {
        pkg_repo_search_cmd.add_argument({
            .help
            = "A name or glob-style pattern. Only matching packages will be returned. \n"
              "Searching is case-insensitive. Only the .italic[name] will be matched (not the \n"
              "version).\n\nIf this parameter is omitted, the search will return .italic[all] \n"
              "available packages."_styled,
            .valname = "<name-or-pattern>",
            .action  = put_into(opts.pkg.search.pattern),
        });
        setup_sdist_create_cmd(sdist_grp.add_parser({
            .name = "create",
            .help = "Create a source distribution from a project tree",
        }));
    }

    void setup_sdist_create_cmd(argument_parser& sdist_create_cmd) {
        sdist_create_cmd.add_argument(project_arg.dup()).help
            = "Path to the project for which to create a source distribution.\n"
              "Default is the current working directory.";
        sdist_create_cmd.add_argument(out_arg.dup()).help
            = "Destination path for the source distributnion archive";
        sdist_create_cmd.add_argument(if_exists_arg.dup()).help
            = "What to do if the destination names an existing file";
    }

    void setup_repoman_cmd(argument_parser& repoman_cmd) {
@@ -414,12 +448,6 @@ struct setup {

    void setup_repoman_add_cmd(argument_parser& repoman_add_cmd) {
        repoman_add_cmd.add_argument(repoman_repo_dir_arg.dup());
        repoman_add_cmd.add_argument({
            .help     = "The package ID of the package to add",
            .valname  = "<pkg-id>",
            .required = true,
            .action   = put_into(opts.repoman.add.pkg_id_str),
        });
        repoman_add_cmd.add_argument({
            .help     = "URL to add to the repository",
            .valname  = "<url>",
@@ -442,6 +470,37 @@ struct setup {
            .action     = push_back_onto(opts.repoman.remove.pkgs),
        });
    }

    void setup_install_yourself_cmd(argument_parser& install_yourself_cmd) {
        install_yourself_cmd.add_argument({
            .long_spellings = {"where"},
            .help = "The scope of the installation. For .bold[system], installs in a global \n"
                    "directory for all users of the system. For .bold[user], installs in a \n"
                    "user-specific directory for executable binaries."_styled,
            .valname = "{user,system}",
            .action  = put_into(opts.install_yourself.where),
        });
        install_yourself_cmd.add_argument({
            .long_spellings = {"dry-run"},
            .help
            = "Do not actually perform any operations, but log what .italic[would] happen"_styled,
            .nargs  = 0,
            .action = store_true(opts.dry_run),
        });
        install_yourself_cmd.add_argument({
            .long_spellings = {"no-modify-path"},
            .help           = "Do not attempt to modify the PATH environment variable",
            .nargs          = 0,
            .action         = store_false(opts.install_yourself.fixup_path_env),
        });
        install_yourself_cmd.add_argument({
            .long_spellings = {"symlink"},
            .help = "Create a symlink at the installed location to the existing 'dds' executable\n"
                    "instead of copying the executable file",
            .nargs  = 0,
            .action = store_true(opts.install_yourself.symlink),
        });
    }
 };

 }  // namespace
@@ -464,7 +523,9 @@ toolchain dds::cli::options::load_toolchain() const {
    }
    // Convert the given string to a toolchain
    auto& tc_str = *toolchain;
    DDS_E_SCOPE(e_loading_toolchain{tc_str});
    if (tc_str.starts_with(":")) {
        DDS_E_SCOPE(e_toolchain_builtin{tc_str});
        auto default_tc = tc_str.substr(1);
        auto tc         = dds::toolchain::get_builtin(default_tc);
        if (!tc.has_value()) {
@@ -474,6 +535,7 @@ toolchain dds::cli::options::load_toolchain() const {
        }
        return std::move(*tc);
    } else {
        DDS_E_SCOPE(e_toolchain_file{tc_str});
        return parse_toolchain_json5(slurp_file(tc_str));
    }
 }
--- a/src/dds/cli/options.hpp
+++ b/src/dds/cli/options.hpp
@@ -25,16 +25,8 @@ enum class subcommand {
    compile_file,
    build_deps,
    pkg,
    sdist,
    repoman,
 };

 /**
 * @brief 'dds sdist' subcommands
 */
 enum class sdist_subcommand {
    _none_,
    create,
    install_yourself,
 };

 /**
@@ -44,8 +36,10 @@ enum class pkg_subcommand {
    _none_,
    ls,
    get,
    create,
    import,
    repo,
    search,
 };

 /**
@@ -103,6 +97,8 @@ struct options {
    opt_path pkg_db_dir;
    // The `--log-level` argument
    log::level log_level = log::level::info;
    // Any `--dry-run` argument
    bool dry_run = false;

    // The top-most selected subcommand
    enum subcommand subcommand;
@@ -143,6 +139,7 @@ struct options {
        opt_path            lm_index;
        std::vector<string> add_repos;
        bool                update_repos = false;
        opt_path            tweaks_dir;
    } build;

    /**
@@ -161,6 +158,8 @@ struct options {
        std::vector<fs::path> deps_files;
        /// Dependency strings provided directly in the command-line
        std::vector<string> deps;
        /// Path to a CMake import file to write
        opt_path cmake_file;
    } build_deps;

    /**
@@ -214,11 +213,15 @@ struct options {
            /// Package IDs to download
            std::vector<string> pkgs;
        } get;
    } pkg;

    struct {
        sdist_subcommand subcommand;
    } sdist;
        /**
         * @brief Parameters for 'dds pkg search'
         */
        struct {
            /// The search pattern, if provided
            opt_string pattern;
        } search;
    } pkg;

    /**
     * @brief Parameters for 'dds repoman'
@@ -244,7 +247,6 @@ struct options {

        /// Options for 'dds repoman add'
        struct {
            std::string pkg_id_str;
            std::string url_str;
            std::string description;
        } add;
@@ -256,6 +258,16 @@ struct options {
        } remove;
    } repoman;

    struct {
        enum where_e {
            system,
            user,
        } where
            = user;
        bool fixup_path_env = true;
        bool symlink        = false;
    } install_yourself;

    /**
     * @brief Attach arguments and subcommands to the given argument parser, binding those arguments
     * to the values in this object.
--- a/src/dds/error/toolchain.hpp
+++ b/src/dds/error/toolchain.hpp
@@ -0,0 +1,19 @@
 #pragma once

 #include <string>

 namespace dds {

 struct e_loading_toolchain {
    std::string value;
 };

 struct e_toolchain_file {
    std::string value;
 };

 struct e_toolchain_builtin {
    std::string value;
 };

 }  // namespace dds
--- a/src/dds/pkg/cache.cpp
+++ b/src/dds/pkg/cache.cpp
@@ -59,7 +59,7 @@ pkg_cache pkg_cache::_open_for_directory(bool writeable, path_ref dirpath) {
    return {writeable, dirpath, std::move(entries)};
 }

 void pkg_cache::add_sdist(const sdist& sd, if_exists ife_action) {
 void pkg_cache::import_sdist(const sdist& sd, if_exists ife_action) {
    neo_assertion_breadcrumbs("Importing sdist archive", sd.manifest.id.to_string());
    if (!_write_enabled) {
        dds_log(critical,
@@ -83,19 +83,32 @@ void pkg_cache::add_sdist(const sdist& sd, if_exists ife_action) {
            dds_log(info, msg + " - Replacing");
        }
    }

    // Create a temporary location where we are creating it
    auto tmp_copy = sd_dest;
    tmp_copy.replace_filename(".tmp-import");
    if (fs::exists(tmp_copy)) {
        fs::remove_all(tmp_copy);
    }
    fs::create_directories(tmp_copy.parent_path());
    fs::copy(sd.path, tmp_copy, fs::copy_options::recursive);

    // Re-create an sdist from the given sdist. This will prune non-sdist files, rather than just
    // fs::copy_all from the source, which may contain extras.
    sdist_params params{
        .project_dir   = sd.path,
        .dest_path     = tmp_copy,
        .include_apps  = true,
        .include_tests = true,
    };
    create_sdist_in_dir(tmp_copy, params);

    // Swap out the temporary to the final location
    if (fs::exists(sd_dest)) {
        fs::remove_all(sd_dest);
    }
    fs::rename(tmp_copy, sd_dest);
    _sdists.insert(sdist::from_directory(sd_dest));
    dds_log(info, "Source distribution '{}' successfully exported", sd.manifest.id.to_string());
    dds_log(info, "Source distribution for '{}' successfully imported", sd.manifest.id.to_string());
 }

 const sdist* pkg_cache::find(const pkg_id& pkg) const noexcept {
--- a/src/dds/pkg/cache.hpp
+++ b/src/dds/pkg/cache.hpp
@@ -81,7 +81,7 @@ public:

    static fs::path default_local_path() noexcept;

    void add_sdist(const sdist&, if_exists = if_exists::throw_exc);
    void import_sdist(const sdist&, if_exists = if_exists::throw_exc);

    const sdist* find(const pkg_id& pk) const noexcept;

--- a/src/dds/pkg/db.cpp
+++ b/src/dds/pkg/db.cpp
@@ -4,6 +4,7 @@
 #include <dds/error/errors.hpp>
 #include <dds/error/nonesuch.hpp>
 #include <dds/solve/solve.hpp>
 #include <dds/util/env.hpp>
 #include <dds/util/log.hpp>
 #include <dds/util/paths.hpp>

@@ -24,6 +25,12 @@ using namespace dds;
 namespace nsql = neo::sqlite3;
 using namespace neo::sqlite3::literals;

 namespace dds {

 void add_init_repo(nsql::database_ref db) noexcept;

 }  // namespace dds

 namespace {

 void migrate_repodb_1(nsql::database& db) {
@@ -82,7 +89,7 @@ void migrate_repodb_3(nsql::database& db) {
        CREATE TABLE dds_pkg_remotes (
            remote_id INTEGER PRIMARY KEY AUTOINCREMENT,
            name TEXT NOT NULL UNIQUE,
            remote_url TEXT NOT NULL,
            url TEXT NOT NULL,
            db_etag TEXT,
            db_mtime TEXT
        );
@@ -225,6 +232,13 @@ void ensure_migrated(nsql::database& db) {
    }
    meta["version"] = current_database_version;
    exec(db.prepare("UPDATE dds_cat_meta SET meta=?"), meta.dump());
    tr.commit();

    if (version < 3 && !getenv_bool("DDS_NO_ADD_INITIAL_REPO")) {
        // Version 3 introduced remote repositories. If we're updating to 3, add that repo now
        dds_log(info, "Downloading initial repository");
        dds::add_init_repo(db);
    }
 }

 }  // namespace
--- a/src/dds/pkg/get/get.cpp
+++ b/src/dds/pkg/get/get.cpp
@@ -12,9 +12,7 @@

 using namespace dds;

 namespace {

 temporary_sdist do_pull_sdist(const any_remote_pkg& rpkg) {
 temporary_sdist dds::get_package_sdist(const any_remote_pkg& rpkg) {
    auto tmpdir = dds::temporary_dir::create();

    rpkg.get_sdist(tmpdir.path());
@@ -29,10 +27,8 @@ temporary_sdist do_pull_sdist(const any_remote_pkg& rpkg) {
    return {sd_tmp_dir, sd};
 }

 }  // namespace

 temporary_sdist dds::get_package_sdist(const pkg_listing& pkg) {
    auto tsd = do_pull_sdist(pkg.remote_pkg);
    auto tsd = get_package_sdist(pkg.remote_pkg);
    if (!(tsd.sdist.manifest.id == pkg.ident)) {
        throw_external_error<errc::sdist_ident_mismatch>(
            "The package name@version in the generated source distribution does not match the name "
@@ -62,7 +58,7 @@ void dds::get_all(const std::vector<pkg_id>& pkgs, pkg_cache& repo, const pkg_db
        dds_log(info, "Download package: {}", inf.ident.to_string());
        auto             tsd = get_package_sdist(inf);
        std::scoped_lock lk{repo_mut};
        repo.add_sdist(tsd.sdist, if_exists::throw_exc);
        repo.import_sdist(tsd.sdist, if_exists::throw_exc);
    });

    if (!okay) {
--- a/src/dds/pkg/get/get.hpp
+++ b/src/dds/pkg/get/get.hpp
@@ -8,7 +8,9 @@ namespace dds {
 class pkg_cache;
 class pkg_db;
 struct pkg_listing;
 class any_remote_pkg;

 temporary_sdist get_package_sdist(const any_remote_pkg&);
 temporary_sdist get_package_sdist(const pkg_listing&);

 void get_all(const std::vector<pkg_id>& pkgs, dds::pkg_cache& repo, const pkg_db& cat);
--- a/src/dds/pkg/remote.cpp
+++ b/src/dds/pkg/remote.cpp
@@ -9,7 +9,9 @@
 #include <dds/util/log.hpp>
 #include <dds/util/result.hpp>

 #include <boost/leaf/handle_exception.hpp>
 #include <fansi/styled.hpp>
 #include <fmt/ostream.h>
 #include <neo/event.hpp>
 #include <neo/io/stream/buffers.hpp>
 #include <neo/io/stream/file.hpp>
@@ -68,10 +70,10 @@ pkg_remote pkg_remote::connect(std::string_view url_str) {

 void pkg_remote::store(nsql::database_ref db) {
    auto st = db.prepare(R"(
        INSERT INTO dds_pkg_remotes (name, remote_url)
        INSERT INTO dds_pkg_remotes (name, url)
            VALUES (?, ?)
        ON CONFLICT (name) DO
            UPDATE SET remote_url = ?2
            UPDATE SET url = ?2
    )");
    nsql::exec(st, _name, _base_url.to_string());
 }
@@ -206,16 +208,16 @@ void pkg_remote::update_pkg_db(nsql::database_ref              db,

 void dds::update_all_remotes(nsql::database_ref db) {
    dds_log(info, "Updating catalog from all remotes");
    auto repos_st = db.prepare("SELECT name, remote_url, db_etag, db_mtime FROM dds_pkg_remotes");
    auto repos_st = db.prepare("SELECT name, url, db_etag, db_mtime FROM dds_pkg_remotes");
    auto tups     = nsql::iter_tuples<std::string,
                                  std::string,
                                  std::optional<std::string>,
                                  std::optional<std::string>>(repos_st)
        | ranges::to_vector;

    for (const auto& [name, remote_url, etag, db_mtime] : tups) {
        DDS_E_SCOPE(e_url_string{remote_url});
        pkg_remote repo{name, neo::url::parse(remote_url)};
    for (const auto& [name, url, etag, db_mtime] : tups) {
        DDS_E_SCOPE(e_url_string{url});
        pkg_remote repo{name, neo::url::parse(url)};
        repo.update_pkg_db(db, etag, db_mtime);
    }

@@ -224,18 +226,18 @@ void dds::update_all_remotes(nsql::database_ref db) {
 }

 void dds::remove_remote(pkg_db& pkdb, std::string_view name) {
    auto&                           db = pkdb.database();
    neo::sqlite3::transaction_guard tr{db};
    auto&                   db = pkdb.database();
    nsql::transaction_guard tr{db};
    auto get_rowid_st          = db.prepare("SELECT remote_id FROM dds_pkg_remotes WHERE name = ?");
    get_rowid_st.bindings()[1] = name;
    auto row                   = neo::sqlite3::unpack_single_opt<std::int64_t>(get_rowid_st);
    auto row                   = nsql::unpack_single_opt<std::int64_t>(get_rowid_st);
    if (!row) {
        BOOST_LEAF_THROW_EXCEPTION(  //
            make_user_error<errc::no_catalog_remote_info>("There is no remote with name '{}'",
                                                          name),
            [&] {
                auto all_st = db.prepare("SELECT name FROM dds_pkg_remotes");
                auto tups   = neo::sqlite3::iter_tuples<std::string>(all_st);
                auto tups   = nsql::iter_tuples<std::string>(all_st);
                auto names  = tups | ranges::views::transform([](auto&& tup) {
                                 auto&& [n] = tup;
                                 return n;
@@ -245,5 +247,63 @@ void dds::remove_remote(pkg_db& pkdb, std::string_view name) {
            });
    }
    auto [rowid] = *row;
    neo::sqlite3::exec(db.prepare("DELETE FROM dds_pkg_remotes WHERE remote_id = ?"), rowid);
    nsql::exec(db.prepare("DELETE FROM dds_pkg_remotes WHERE remote_id = ?"), rowid);
 }

 void dds::add_init_repo(nsql::database_ref db) noexcept {
    std::string_view init_repo = "https://repo-1.dds.pizza";
    // _Do not_ let errors stop us from continuing
    bool okay = boost::leaf::try_catch(
        [&]() -> bool {
            try {
                auto remote = pkg_remote::connect(init_repo);
                remote.store(db);
                update_all_remotes(db);
                return true;
            } catch (...) {
                capture_exception();
            }
        },
        [](http_status_error err, http_response_info resp, neo::url url) {
            dds_log(error,
                    "An HTTP error occurred while adding the initial repository [{}]: HTTP Status "
                    "{} {}",
                    err.what(),
                    url.to_string(),
                    resp.status,
                    resp.status_message);
            return false;
        },
        [](e_sqlite3_error_exc e, neo::url url) {
            dds_log(error,
                    "Error accessing remote database while adding initial repository: {}: {}",
                    url.to_string(),
                    e.message);
            return false;
        },
        [](e_sqlite3_error_exc e) {
            dds_log(error, "Unexpected database error: {}", e.message);
            return false;
        },
        [](e_system_error_exc e, network_origin conn) {
            dds_log(error,
                    "Error communicating with [.br.red[{}://{}:{}]`]: {}"_styled,
                    conn.protocol,
                    conn.hostname,
                    conn.port,
                    e.message);
            return false;
        },
        [](boost::leaf::diagnostic_info const& diag) -> int {
            dds_log(critical, "Unhandled error while adding initial package repository: ", diag);
            throw;
        });
    if (!okay) {
        dds_log(warn, "We failed to add the initial package repository [{}]", init_repo);
        dds_log(warn, "No remote packages will be available until the above issue is resolved.");
        dds_log(
            warn,
            "The remote package repository can be added again with [.br.yellow[dds pkg repo add \"{}\"]]"_styled,
            init_repo);
    }
 }
--- a/src/dds/pkg/remote.hpp
+++ b/src/dds/pkg/remote.hpp
@@ -34,4 +34,6 @@ public:
 void update_all_remotes(neo::sqlite3::database_ref);
 void remove_remote(pkg_db& db, std::string_view name);

 void add_init_repo(neo::sqlite3::database_ref db) noexcept;

 }  // namespace dds
--- a/src/dds/pkg/search.cpp
+++ b/src/dds/pkg/search.cpp
@@ -0,0 +1,76 @@
 #include "./search.hpp"

 #include <dds/dym.hpp>
 #include <dds/error/nonesuch.hpp>
 #include <dds/error/result.hpp>
 #include <dds/util/log.hpp>
 #include <dds/util/string.hpp>

 #include <neo/sqlite3/database.hpp>
 #include <neo/sqlite3/iter_tuples.hpp>

 #include <range/v3/algorithm/sort.hpp>
 #include <range/v3/range/conversion.hpp>
 #include <range/v3/view/transform.hpp>

 using namespace dds;
 namespace nsql = neo::sqlite3;

 result<pkg_search_results> dds::pkg_search(nsql::database_ref              db,
                                           std::optional<std::string_view> pattern) noexcept {
    auto search_st = db.prepare(R"(
        SELECT pkg.name,
               group_concat(version, ';;'),
               description,
               remote.name,
               remote.url
          FROM dds_pkgs AS pkg
          JOIN dds_pkg_remotes AS remote USING(remote_id)
         WHERE lower(pkg.name) GLOB lower(:pattern)
      GROUP BY pkg.name, remote_id, description
      ORDER BY remote.name, pkg.name
    )");
    // If no pattern, grab _everything_
    auto final_pattern = pattern.value_or("*");
    dds_log(debug, "Searching for packages matching pattern '{}'", final_pattern);
    search_st.bindings()[1] = final_pattern;
    auto rows = nsql::iter_tuples<std::string, std::string, std::string, std::string, std::string>(
        search_st);

    std::vector<pkg_group_search_result> found;
    for (auto [name, versions, desc, remote_name, remote_url] : rows) {
        dds_log(debug,
                "Found: {} with versions {} (Description: {}) from {} [{}]",
                name,
                versions,
                desc,
                remote_name,
                remote_url);
        auto version_strs = split(versions, ";;");
        auto versions_semver
            = version_strs | ranges::views::transform(&semver::version::parse) | ranges::to_vector;
        ranges::sort(versions_semver);
        found.push_back(pkg_group_search_result{
            .name        = name,
            .versions    = versions_semver,
            .description = desc,
            .remote_name = remote_name,
        });
    }

    if (found.empty()) {
        return boost::leaf::new_error([&] {
            auto names_st  = db.prepare("SELECT DISTINCT name from dds_pkgs");
            auto tups      = nsql::iter_tuples<std::string>(names_st);
            auto names_vec = tups | ranges::views::transform([](auto&& row) {
                                 auto [name] = row;
                                 return name;
                             })
                | ranges::to_vector;
            auto nearest = dds::did_you_mean(final_pattern, names_vec);
            return e_nonesuch{final_pattern, nearest};
        });
    }

    return pkg_search_results{.found = std::move(found)};
 }
--- a/src/dds/pkg/search.hpp
+++ b/src/dds/pkg/search.hpp
@@ -0,0 +1,33 @@
 #pragma once

 #include <dds/error/result_fwd.hpp>

 #include <semver/version.hpp>

 #include <optional>
 #include <string_view>
 #include <vector>

 namespace neo::sqlite3 {

 class database_ref;

 }  // namespace neo::sqlite3

 namespace dds {

 struct pkg_group_search_result {
    std::string                  name;
    std::vector<semver::version> versions;
    std::string                  description;
    std::string                  remote_name;
 };

 struct pkg_search_results {
    std::vector<pkg_group_search_result> found;
 };

 result<pkg_search_results> pkg_search(neo::sqlite3::database_ref      db,
                                      std::optional<std::string_view> query) noexcept;

 }  // namespace dds
--- a/src/dds/sdist/dist.cpp
+++ b/src/dds/sdist/dist.cpp
@@ -116,7 +116,6 @@ sdist dds::create_sdist_in_dir(path_ref out, const sdist_params& params) {

    auto pkg_man = package_manifest::load_from_file(*man_path);
    sdist_export_file(out, params.project_dir, *man_path);
    dds_log(info, "Generated export as {}", pkg_man.id.to_string());
    return sdist::from_directory(out);
 }

--- a/src/dds/toolchain/toolchain.cpp
+++ b/src/dds/toolchain/toolchain.cpp
@@ -97,6 +97,13 @@ compile_command_info toolchain::create_compile_command(const compile_file_spec&
        extend(flags, _tty_flags);
    }

    if (knobs.cache_buster) {
        // This is simply a CPP definition that is used to "bust" any caches that rely on inspecting
        // the command-line of the compiler (including our own).
        auto def = replace(_def_template, "[def]", "__dds_cachebust=" + *knobs.cache_buster);
        extend(flags, def);
    }

    dds_log(trace, "#include-search dirs:");
    for (auto&& inc_dir : spec.include_dirs) {
        dds_log(trace, "  - search: {}", inc_dir.string());
@@ -111,6 +118,13 @@ compile_command_info toolchain::create_compile_command(const compile_file_spec&
        extend(flags, inc_args);
    }

    if (knobs.tweaks_dir) {
        dds_log(trace, "  - search (tweaks): {}", knobs.tweaks_dir->string());
        auto shortest       = shortest_path_from(*knobs.tweaks_dir, cwd);
        auto tweak_inc_args = include_args(shortest);
        extend(flags, tweak_inc_args);
    }

    for (auto&& def : spec.definitions) {
        auto def_args = definition_args(def);
        extend(flags, def_args);
--- a/src/dds/toolchain/toolchain.hpp
+++ b/src/dds/toolchain/toolchain.hpp
@@ -18,6 +18,9 @@ enum class language {

 struct toolchain_knobs {
    bool is_tty = false;
    // Directory storing tweaks for the compilation
    std::optional<fs::path>    tweaks_dir{};
    std::optional<std::string> cache_buster{};
 };

 struct compile_file_spec {
--- a/src/dds/util/env.cpp
+++ b/src/dds/util/env.cpp
@@ -0,0 +1,18 @@
 #include "./env.hpp"

 #include <neo/utility.hpp>

 #include <cstdlib>

 std::optional<std::string> dds::getenv(const std::string& varname) noexcept {
    auto cptr = std::getenv(varname.data());
    if (cptr) {
        return std::string(cptr);
    }
    return {};
 }

 bool dds::getenv_bool(const std::string& varname) noexcept {
    auto s = getenv(varname);
    return s == neo::oper::any_of("1", "true", "on", "TRUE", "ON", "YES", "yes");
 }
--- a/src/dds/util/env.hpp
+++ b/src/dds/util/env.hpp
@@ -0,0 +1,23 @@
 #pragma once

 #include <neo/concepts.hpp>

 #include <optional>
 #include <string>

 namespace dds {

 std::optional<std::string> getenv(const std::string& env) noexcept;

 bool getenv_bool(const std::string& env) noexcept;

 template <neo::invocable Func>
 std::string getenv(const std::string& name, Func&& fn) noexcept(noexcept(fn())) {
    auto val = getenv(name);
    if (!val) {
        return std::string(fn());
    }
    return *val;
 }

 }  // namespace dds
--- a/src/dds/util/fs.cpp
+++ b/src/dds/util/fs.cpp
@@ -1,5 +1,8 @@
 #include "./fs.hpp"

 #include <dds/error/on_error.hpp>
 #include <dds/error/result.hpp>

 #include <fmt/core.h>

 #include <sstream>
@@ -7,13 +10,8 @@
 using namespace dds;

 std::fstream dds::open(const fs::path& filepath, std::ios::openmode mode, std::error_code& ec) {
    std::fstream ret;
    auto         mask = ret.exceptions() | std::ios::badbit;
    ret.exceptions(mask);

    try {
        ret.open(filepath.string(), mode);
    } catch (const std::ios::failure&) {
    std::fstream ret{filepath, mode};
    if (!ret) {
        ec = std::error_code(errno, std::system_category());
    }
    return ret;
@@ -55,4 +53,51 @@ void dds::safe_rename(path_ref source, path_ref dest) {
    }
    fs::rename(tmp, dest);
    fs::remove_all(source);
 }

 result<void> dds::copy_file(path_ref source, path_ref dest, fs::copy_options opts) noexcept {
    std::error_code ec;
    fs::copy_file(source, dest, opts, ec);
    if (ec) {
        return new_error(DDS_E_ARG(e_copy_file{source, dest}), ec);
    }
    return {};
 }

 result<void> dds::remove_file(path_ref file) noexcept {
    std::error_code ec;
    fs::remove(file, ec);
    if (ec) {
        return new_error(DDS_E_ARG(e_remove_file{file}), ec);
    }
    return {};
 }

 result<void> dds::create_symlink(path_ref target, path_ref symlink) noexcept {
    std::error_code ec;
    if (fs::is_directory(target)) {
        fs::create_directory_symlink(target, symlink, ec);
    } else {
        fs::create_symlink(target, symlink, ec);
    }
    if (ec) {
        return new_error(DDS_E_ARG(e_symlink{symlink, target}), ec);
    }
    return {};
 }

 result<void> dds::write_file(path_ref dest, std::string_view content) noexcept {
    std::error_code ec;
    auto            outfile = dds::open(dest, std::ios::binary | std::ios::out, ec);
    if (ec) {
        return new_error(DDS_E_ARG(e_write_file_path{dest}), ec);
    }
    errno = 0;
    outfile.write(content.data(), content.size());
    auto e = errno;
    if (!outfile) {
        return new_error(std::error_code(e, std::system_category()),
                         DDS_E_ARG(e_write_file_path{dest}));
    }
    return {};
 }
--- a/src/dds/util/fs.hpp
+++ b/src/dds/util/fs.hpp
@@ -1,5 +1,7 @@
 #pragma once

 #include <dds/error/result_fwd.hpp>

 #include <filesystem>
 #include <fstream>
 #include <string>
@@ -16,6 +18,11 @@ using path_ref = const fs::path&;
 std::fstream open(const fs::path& filepath, std::ios::openmode mode, std::error_code& ec);
 std::string  slurp_file(const fs::path& path, std::error_code& ec);

 struct e_write_file_path {
    fs::path value;
 };
 [[nodiscard]] result<void> write_file(const fs::path& path, std::string_view content) noexcept;

 inline std::fstream open(const fs::path& filepath, std::ios::openmode mode) {
    std::error_code ec;
    auto            ret = dds::open(filepath, mode, ec);
@@ -36,6 +43,26 @@ inline std::string slurp_file(const fs::path& path) {

 void safe_rename(path_ref source, path_ref dest);

 struct e_copy_file {
    fs::path source;
    fs::path dest;
 };

 struct e_remove_file {
    fs::path value;
 };

 struct e_symlink {
    fs::path symlink;
    fs::path target;
 };

 [[nodiscard]] result<void>
                           copy_file(path_ref source, path_ref dest, fs::copy_options opts = {}) noexcept;
 [[nodiscard]] result<void> remove_file(path_ref file) noexcept;

 [[nodiscard]] result<void> create_symlink(path_ref target, path_ref symlink) noexcept;

 }  // namespace file_utils

 }  // namespace dds
--- a/src/dds/util/http/pool.cpp
+++ b/src/dds/util/http/pool.cpp
@@ -111,8 +111,9 @@ struct http_client_impl {
            {"Host", hostname_port},
            {"Accept", "*/*"},
            {"Content-Length", "0"},
            {"TE", "gzip, chunked, plain"},
            {"TE", "gzip, chunked"},
            {"Connection", "keep-alive"},
            {"User-Agent", "dds 0.1.0-alpha.6"},
        };
        if (!params.prior_etag.empty()) {
            headers.push_back({"If-None-Match", params.prior_etag});
@@ -385,8 +386,8 @@ void http_client::_set_ready() noexcept {
 }

 request_result http_pool::request(neo::url url, http_request_params params) {
    DDS_E_SCOPE(url);
    for (auto i = 0; i <= 100; ++i) {
        DDS_E_SCOPE(url);
        params.path  = url.path;
        params.query = url.query.value_or("");

@@ -410,18 +411,18 @@ request_result http_pool::request(neo::url url, http_request_params params) {

        if (resp.is_error()) {
            client.discard_body(resp);
            throw boost::leaf::exception(http_status_error("Received an error from HTTP"));
            throw BOOST_LEAF_EXCEPTION(http_status_error("Received an error from HTTP"));
        }

        if (resp.is_redirect()) {
            client.discard_body(resp);
            if (i == 100) {
                throw boost::leaf::exception(
                throw BOOST_LEAF_EXCEPTION(
                    http_server_error("Encountered over 100 HTTP redirects. Request aborted."));
            }
            auto loc = resp.headers.find("Location");
            if (!loc) {
                throw boost::leaf::exception(
                throw BOOST_LEAF_EXCEPTION(
                    http_server_error("Server sent an invalid response of a 30x redirect without a "
                                      "'Location' header"));
            }
--- a/src/dds/util/output.hpp
+++ b/src/dds/util/output.hpp
@@ -2,6 +2,8 @@

 namespace dds {

 void enable_ansi_console() noexcept;

 bool stdout_is_a_tty() noexcept;

 }  // namespace dds
--- a/src/dds/util/output.nix.cpp
+++ b/src/dds/util/output.nix.cpp
@@ -6,6 +6,10 @@

 using namespace dds;

 void dds::enable_ansi_console() noexcept {
    // unix consoles generally already support ANSI control chars by default
 }

 bool dds::stdout_is_a_tty() noexcept { return ::isatty(STDOUT_FILENO) != 0; }

 #endif
--- a/src/dds/util/output.win.cpp
+++ b/src/dds/util/output.win.cpp
@@ -1,10 +1,36 @@
 #include <dds/util/output.hpp>

 #if _WIN32

 #include <dds/util/output.hpp>
 #include <windows.h>

 void dds::enable_ansi_console() noexcept {
    auto stdio_console = ::GetStdHandle(STD_OUTPUT_HANDLE);
    if (stdio_console == INVALID_HANDLE_VALUE) {
        // Oh well...
        return;
    }
    DWORD mode = 0;
    if (!::GetConsoleMode(stdio_console, &mode)) {
        // Failed to get the mode?
        return;
    }
    // Set the bit!
    mode |= ENABLE_VIRTUAL_TERMINAL_PROCESSING;
    ::SetConsoleMode(stdio_console, mode);
 }

 bool dds::stdout_is_a_tty() noexcept {
    // XXX: Newer Windows consoles support ANSI color, so this should be made smarter
    return false;
    auto stdio_console = ::GetStdHandle(STD_OUTPUT_HANDLE);
    if (stdio_console == INVALID_HANDLE_VALUE) {
        return false;
    }
    DWORD mode = 0;
    if (!::GetConsoleMode(stdio_console, &mode)) {
        // Failed to get the mode
        return false;
    }
    return (mode & ENABLE_VIRTUAL_TERMINAL_PROCESSING);
 }

 #endif
--- a/src/dds/util/paths.linux_fbsd.cpp
+++ b/src/dds/util/paths.linux_fbsd.cpp
@@ -2,6 +2,7 @@

 #include "./paths.hpp"

 #include <dds/util/env.hpp>
 #include <dds/util/log.hpp>

 #include <cstdlib>
@@ -10,45 +11,34 @@ using namespace dds;

 fs::path dds::user_home_dir() {
    static auto ret = []() -> fs::path {
        auto home_env = std::getenv("HOME");
        if (!home_env) {
        return fs::absolute(dds::getenv("HOME", [] {
            dds_log(error, "No HOME environment variable set!");
            return "/";
        }
        return fs::absolute(fs::path(home_env));
        }));
    }();
    return ret;
 }

 fs::path dds::user_data_dir() {
    static auto ret = []() -> fs::path {
        auto xdg_data_home = std::getenv("XDG_DATA_HOME");
        if (xdg_data_home) {
            return fs::absolute(fs::path(xdg_data_home));
        }
        return user_home_dir() / ".local/share";
        return fs::absolute(
            dds::getenv("XDG_DATA_HOME", [] { return user_home_dir() / ".local/share"; }));
    }();
    return ret;
 }

 fs::path dds::user_cache_dir() {
    static auto ret = []() -> fs::path {
        auto xdg_cache_home = std::getenv("XDG_CACHE_HOME");
        if (xdg_cache_home) {
            return fs::absolute(fs::path(xdg_cache_home));
        }
        return user_home_dir() / ".cache";
        return fs::absolute(
            dds::getenv("XDG_CACHE_HOME", [] { return user_home_dir() / ".cache"; }));
    }();
    return ret;
 }

 fs::path dds::user_config_dir() {
    static auto ret = []() -> fs::path {
        auto xdg_config_home = std::getenv("XDG_CONFIG_HOME");
        if (xdg_config_home) {
            return fs::absolute(fs::path(xdg_config_home));
        }
        return user_home_dir() / ".config";
        return fs::absolute(
            dds::getenv("XDG_CONFIG_HOME", [] { return user_home_dir() / ".config"; }));
    }();
    return ret;
 }
--- a/src/dds/util/paths.macos.cpp
+++ b/src/dds/util/paths.macos.cpp
@@ -2,6 +2,7 @@

 #include "./paths.hpp"

 #include <dds/util/env.hpp>
 #include <dds/util/log.hpp>

 #include <cstdlib>
@@ -10,12 +11,10 @@ using namespace dds;

 fs::path dds::user_home_dir() {
    static auto ret = []() -> fs::path {
        auto home_env = std::getenv("HOME");
        if (!home_env) {
            dds_log(warn, "No HOME environment variable set!");
        return fs::absolute(dds::getenv("HOME", [] {
            dds_log(error, "No HOME environment variable set!");
            return "/";
        }
        return fs::absolute(fs::path(home_env));
        }));
    }();
    return ret;
 }
@@ -24,4 +23,4 @@ fs::path dds::user_data_dir() { return user_home_dir() / "Library/Application Su
 fs::path dds::user_cache_dir() { return user_home_dir() / "Library/Caches"; }
 fs::path dds::user_config_dir() { return user_home_dir() / "Preferences"; }

 #endif
 #endif
--- a/src/dds/util/result.cpp
+++ b/src/dds/util/result.cpp
@@ -1,5 +1,6 @@
 #include "./result.hpp"

 #include <dds/util/env.hpp>
 #include <dds/util/log.hpp>

 #include <fmt/ostream.h>
@@ -23,9 +24,9 @@ void dds::capture_exception() {

 void dds::write_error_marker(std::string_view error) noexcept {
    dds_log(trace, "[error marker {}]", error);
    auto efile_path = std::getenv("DDS_WRITE_ERROR_MARKER");
    auto efile_path = dds::getenv("DDS_WRITE_ERROR_MARKER");
    if (efile_path) {
        std::ofstream outfile{efile_path, std::ios::binary};
        std::ofstream outfile{*efile_path, std::ios::binary};
        fmt::print(outfile, "{}", error);
    }
 }
--- a/src/dds/util/string.hpp
+++ b/src/dds/util/string.hpp
@@ -86,6 +86,21 @@ replace(std::vector<std::string> strings, std::string_view key, std::string_view
    return strings;
 }

 template <typename Range>
 inline std::string joinstr(std::string_view joiner, Range&& rng) {
    auto        iter = std::begin(rng);
    auto        end  = std::end(rng);
    std::string ret;
    while (iter != end) {
        ret.append(*iter);
        ++iter;
        if (iter != end) {
            ret.append(joiner);
        }
    }
    return ret;
 }

 }  // namespace string_utils

 }  // namespace dds
--- a/src/debate/argument_parser.cpp
+++ b/src/debate/argument_parser.cpp
@@ -1,11 +1,15 @@
 #include "./argument_parser.hpp"

 /// XXX: Refactor this after pulling debate:: out of dds
 #include <dds/dym.hpp>

 #include <boost/leaf/error.hpp>
 #include <boost/leaf/exception.hpp>
 #include <boost/leaf/on_error.hpp>

 #include <fmt/color.h>
 #include <fmt/format.h>
 #include <neo/scope.hpp>

 #include <set>

@@ -32,7 +36,7 @@ struct parse_engine {
    void see(const argument& arg) {
        auto did_insert = seen.insert(&arg).second;
        if (!did_insert && !arg.can_repeat) {
            throw boost::leaf::exception(invalid_repitition("Invalid repitition"));
            BOOST_LEAF_THROW_EXCEPTION(invalid_repitition("Invalid repitition"));
        }
    }

@@ -45,12 +49,42 @@ struct parse_engine {
        finalize();
    }

    std::optional<std::string> find_nearest_arg_spelling(std::string_view given) const noexcept {
        std::vector<std::string> candidates;
        // Only match arguments of the corrent type
        auto parser = bottom_parser;
        while (parser) {
            for (auto& arg : parser->arguments()) {
                for (auto& l : arg.long_spellings) {
                    candidates.push_back("--" + l);
                }
                for (auto& s : arg.short_spellings) {
                    candidates.push_back("-" + s);
                }
            }
            parser = parser->parent().pointer();
        }
        if (bottom_parser->subparsers()) {
            auto&& grp = *bottom_parser->subparsers();
            for (auto& p : grp._p_subparsers) {
                candidates.push_back(p.name);
            }
        }
        return dds::did_you_mean(given, candidates);
    }

    void parse_another() {
        auto given     = current_arg();
        auto did_parse = try_parse_given(given);
        if (!did_parse) {
            throw boost::leaf::exception(unrecognized_argument("Unrecognized argument"),
                                         e_arg_spelling{std::string(given)});
            neo_defer {
                auto dym = find_nearest_arg_spelling(given);
                if (dym) {
                    boost::leaf::current_error().load(e_did_you_mean{*dym});
                }
            };
            BOOST_LEAF_THROW_EXCEPTION(unrecognized_argument("Unrecognized argument"),
                                       e_arg_spelling{std::string(given)});
        }
    }

@@ -81,7 +115,7 @@ struct parse_engine {

    bool try_parse_long(strv tail, const strv given) {
        if (tail == "help") {
            throw boost::leaf::exception(help_request());
            BOOST_LEAF_THROW_EXCEPTION(help_request());
        }
        auto argset = bottom_parser;
        while (argset) {
@@ -115,8 +149,8 @@ struct parse_engine {
        if (arg.nargs == 0) {
            if (!tail.empty()) {
                // We should not have a value
                throw boost::leaf::exception(invalid_arguments("Argument does not expect a value"),
                                             e_wrong_val_num{1});
                BOOST_LEAF_THROW_EXCEPTION(invalid_arguments("Argument does not expect a value"),
                                           e_wrong_val_num{1});
            }
            // Just a switch. Dispatch
            arg.action(given, given);
@@ -133,17 +167,17 @@ struct parse_engine {
            tail.remove_prefix(1);
            // The remainder is a single value
            if (arg.nargs > 1) {
                throw boost::leaf::exception(invalid_arguments("Invalid number of values"),
                                             e_wrong_val_num{1});
                BOOST_LEAF_THROW_EXCEPTION(invalid_arguments("Invalid number of values"),
                                           e_wrong_val_num{1});
            }
            arg.action(tail, given);
        } else {
            // Trailing words are arguments
            for (auto i = 0; i < arg.nargs; ++i) {
                if (at_end()) {
                    throw boost::leaf::exception(invalid_arguments(
                                                     "Invalid number of argument values"),
                                                 e_wrong_val_num{i});
                    BOOST_LEAF_THROW_EXCEPTION(invalid_arguments(
                                                   "Invalid number of argument values"),
                                               e_wrong_val_num{i});
                }
                arg.action(current_arg(), given);
                shift();
@@ -164,7 +198,7 @@ struct parse_engine {

    bool try_parse_short(strv tail, const strv given) {
        if (tail == "h") {
            throw boost::leaf::exception(help_request());
            BOOST_LEAF_THROW_EXCEPTION(help_request());
        }
        auto argset = bottom_parser;
        while (argset) {
@@ -213,7 +247,7 @@ struct parse_engine {
                // The next argument is the value
                shift();
                if (at_end()) {
                    throw boost::leaf::exception(invalid_arguments("Expected a value"));
                    BOOST_LEAF_THROW_EXCEPTION(invalid_arguments("Expected a value"));
                }
                arg.action(current_arg(), spelling);
                shift();
@@ -228,16 +262,15 @@ struct parse_engine {
        } else {
            // Consume the next arguments
            if (!tail.empty()) {
                throw boost::leaf::exception(invalid_arguments(
                                                 "Wrong number of argument values given"),
                                             e_wrong_val_num{1});
                BOOST_LEAF_THROW_EXCEPTION(invalid_arguments(
                                               "Wrong number of argument values given"),
                                           e_wrong_val_num{1});
            }
            shift();
            for (auto i = 0; i < arg.nargs; ++i) {
                if (at_end()) {
                    throw boost::leaf::exception(invalid_arguments(
                                                     "Wrong number of argument values"),
                                                 e_wrong_val_num{i});
                    BOOST_LEAF_THROW_EXCEPTION(invalid_arguments("Wrong number of argument values"),
                                               e_wrong_val_num{i});
                }
                arg.action(current_arg(), spelling);
                shift();
@@ -343,15 +376,15 @@ struct parse_engine {
            argset = argset->parent().pointer();
        }
        if (bottom_parser->subparsers() && bottom_parser->subparsers()->required) {
            throw boost::leaf::exception(missing_required("Expected a subcommand"));
            BOOST_LEAF_THROW_EXCEPTION(missing_required("Expected a subcommand"));
        }
    }

    void finalize(const argument_parser& argset) {
        for (auto& arg : argset.arguments()) {
            if (arg.required && !seen.contains(&arg)) {
                throw boost::leaf::exception(missing_required("Required argument is missing"),
                                             e_argument{arg});
                BOOST_LEAF_THROW_EXCEPTION(missing_required("Required argument is missing"),
                                           e_argument{arg});
            }
        }
    }
--- a/src/fansi/styled.cpp
+++ b/src/fansi/styled.cpp
@@ -16,7 +16,20 @@
 #include <vector>

 #if NEO_OS_IS_WINDOWS
 bool fansi::detect_should_style() noexcept { return false; }
 #include <windows.h>

 bool fansi::detect_should_style() noexcept {
    auto stdio_console = ::GetStdHandle(STD_OUTPUT_HANDLE);
    if (stdio_console == INVALID_HANDLE_VALUE) {
        return false;
    }
    DWORD mode = 0;
    if (!::GetConsoleMode(stdio_console, &mode)) {
        // Failed to get the mode
        return false;
    }
    return (mode & ENABLE_VIRTUAL_TERMINAL_PROCESSING);
 }
 #else
 #include <unistd.h>
 bool fansi::detect_should_style() noexcept { return ::isatty(STDOUT_FILENO); }
@@ -163,7 +176,7 @@ std::string fansi::stylize(std::string_view str, fansi::should_style should) {
    return text_styler{str, should}.render();
 }

 std::string_view detail::cached_rendering(const char* ptr) noexcept {
 const std::string& detail::cached_rendering(const char* ptr) noexcept {
    thread_local std::map<const char*, std::string> cache;
    auto                                            found = cache.find(ptr);
    if (found == cache.end()) {
--- a/src/fansi/styled.hpp
+++ b/src/fansi/styled.hpp
@@ -19,12 +19,12 @@ enum class should_style {
 std::string stylize(std::string_view text, should_style = should_style::detect);

 namespace detail {
 std::string_view cached_rendering(const char* ptr) noexcept;
 const std::string& cached_rendering(const char* ptr) noexcept;
 }

 inline namespace literals {
 inline namespace styled_literals {
 inline std::string_view operator""_styled(const char* str, std::size_t) {
 inline const std::string& operator""_styled(const char* str, std::size_t) {
    return detail::cached_rendering(str);
 }

--- a/tests/projects/sdist/src/foo.cpp
+++ b/tests/projects/sdist/src/foo.cpp
--- a/tests/projects/simple-cmake/CMakeLists.txt
+++ b/tests/projects/simple-cmake/CMakeLists.txt
@@ -0,0 +1,7 @@
 cmake_minimum_required(VERSION 3.12)
 project(TestProject)

 include(${PROJECT_BINARY_DIR}/libraries.cmake)

 add_executable(app main.cpp)
 target_link_libraries(app PRIVATE test::foo)
--- a/tests/projects/simple-cmake/main.cpp
+++ b/tests/projects/simple-cmake/main.cpp
@@ -0,0 +1,3 @@
 #include <foo.hpp>

 int main() { say_hello(); }
--- a/tests/projects/simple/include/foo.hpp
+++ b/tests/projects/simple/include/foo.hpp
@@ -0,0 +1,3 @@
 #pragma once

 extern void say_hello();
--- a/tests/projects/simple/include/header.h
+++ b/tests/projects/simple/include/header.h
--- a/tests/projects/simple/include/header.hpp
+++ b/tests/projects/simple/include/header.hpp
--- a/tests/projects/simple/library.jsonc
+++ b/tests/projects/simple/library.jsonc
--- a/tests/projects/simple/other-file.txt
+++ b/tests/projects/simple/other-file.txt
--- a/tests/projects/simple/package.json5
+++ b/tests/projects/simple/package.json5
--- a/tests/projects/simple/src/foo.cpp
+++ b/tests/projects/simple/src/foo.cpp
@@ -0,0 +1,5 @@
 #include <foo.hpp>

 #include <iostream>

 void say_hello() { std::cout << "Hello!\n"; }
--- a/tests/projects/tweaks/include/tweakable.config.hpp
+++ b/tests/projects/tweaks/include/tweakable.config.hpp
@@ -0,0 +1,21 @@
 #pragma once

 #if __has_include(<tweakable.tweaks.hpp>)
 #include <tweakable.tweaks.hpp>
 #endif

 namespace tweakable {

 namespace config {

 namespace defaults {

 const int value = 99;

 }  // namespace defaults

 using namespace defaults;

 }  // namespace config

 }  // namespace tweakable
--- a/tests/projects/tweaks/include/tweakable.hpp
+++ b/tests/projects/tweaks/include/tweakable.hpp
@@ -0,0 +1,7 @@
 #pragma once

 namespace tweakable {

 extern int get_value();

 }  // namespace tweakable
--- a/tests/projects/tweaks/library.jsonc
+++ b/tests/projects/tweaks/library.jsonc
@@ -0,0 +1,3 @@
 {
    "name": "foo"
 }
--- a/tests/projects/tweaks/package.json5
+++ b/tests/projects/tweaks/package.json5
@@ -0,0 +1,5 @@
 {
    name: 'tweakable',
    version: '1.2.3',
    "namespace": "test",
 }
--- a/tests/projects/tweaks/src/tweakable.cpp
+++ b/tests/projects/tweaks/src/tweakable.cpp
@@ -0,0 +1,6 @@
 #include <tweakable.config.hpp>
 #include <tweakable.hpp>

 #include <iostream>

 int tweakable::get_value() { return tweakable::config::value; }
--- a/tests/projects/tweaks/src/tweakable.main.cpp
+++ b/tests/projects/tweaks/src/tweakable.main.cpp
@@ -0,0 +1,3 @@
 #include <tweakable.hpp>

 int main() { return tweakable::get_value(); }
--- a/tests/test_basics.py
+++ b/tests/test_basics.py
@@ -81,6 +81,6 @@ def test_empty_with_pkg_json(tmp_project: Project) -> None:

 def test_empty_sdist_create(tmp_project: Project) -> None:
    tmp_project.package_json = TEST_PACKAGE
    tmp_project.sdist_create()
    tmp_project.pkg_create()
    assert tmp_project.build_root.joinpath('test-pkg@0.2.2.tar.gz').is_file(), \
        'The expected sdist tarball was not generated'
--- a/tests/test_build_deps.py
+++ b/tests/test_build_deps.py