Support styled output in Windows consoles

src/dds.main.cpp

@@ -1,6 +1,7 @@
 #include <dds/cli/dispatch_main.hpp>
 #include <dds/cli/options.hpp>
 #include <dds/util/log.hpp>
+#include <dds/util/output.hpp>
 #include <dds/util/signal.hpp>
 
 #include <debate/debate.hpp>
@@ -35,6 +36,7 @@ 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;

src/dds/util/output.hpp

@@ -2,6 +2,8 @@
 
 namespace dds {
 
+void enable_ansi_console() noexcept;
+
 bool stdout_is_a_tty() noexcept;
 
 }  // namespace dds

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

src/dds/util/output.win.cpp

@@ -1,10 +1,37 @@
+#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