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<hr>
<a name="Output-Styling-1"></a>
<h3 class="section">22.5 Output Styling</h3>
<a name="index-styling"></a>
<a name="index-colors"></a>

<a name="index-set-style"></a>
<a name="index-show-style"></a>
<p><small>GDB</small> can style its output on a capable terminal.  This is
enabled by default on most systems, but disabled by default when in
batch mode (see <a href="Mode-Options.html#Mode-Options">Mode Options</a>).  Various style settings are available;
and styles can also be disabled entirely.
</p>
<dl compact="compact">
<dt><code>set style enabled &lsquo;<samp>on|off</samp>&rsquo;</code></dt>
<dd><p>Enable or disable all styling.  The default is host-dependent, with
most hosts defaulting to &lsquo;<samp>on</samp>&rsquo;.
</p>
</dd>
<dt><code>show style enabled</code></dt>
<dd><p>Show the current state of styling.
</p>
</dd>
<dt><code>set style sources &lsquo;<samp>on|off</samp>&rsquo;</code></dt>
<dd><p>Enable or disable source code styling.  This affects whether source
code, such as the output of the <code>list</code> command, is styled.  Note
that source styling only works if styling in general is enabled, and
if <small>GDB</small> was linked with the GNU Source Highlight library.  The
default is &lsquo;<samp>on</samp>&rsquo;.
</p>
</dd>
<dt><code>show style sources</code></dt>
<dd><p>Show the current state of source code styling.
</p></dd>
</dl>

<p>Subcommands of <code>set style</code> control specific forms of styling.
These subcommands all follow the same pattern: each style-able object
can be styled with a foreground color, a background color, and an
intensity.
</p>
<p>For example, the style of file names can be controlled using the
<code>set style filename</code> group of commands:
</p>
<dl compact="compact">
<dt><code>set style filename background <var>color</var></code></dt>
<dd><p>Set the background to <var>color</var>.  Valid colors are &lsquo;<samp>none</samp>&rsquo;
(meaning the terminal&rsquo;s default color), &lsquo;<samp>black</samp>&rsquo;, &lsquo;<samp>red</samp>&rsquo;,
&lsquo;<samp>green</samp>&rsquo;, &lsquo;<samp>yellow</samp>&rsquo;, &lsquo;<samp>blue</samp>&rsquo;, &lsquo;<samp>magenta</samp>&rsquo;, &lsquo;<samp>cyan</samp>&rsquo;,
and&lsquo;<samp>white</samp>&rsquo;.
</p>
</dd>
<dt><code>set style filename foreground <var>color</var></code></dt>
<dd><p>Set the foreground to <var>color</var>.  Valid colors are &lsquo;<samp>none</samp>&rsquo;
(meaning the terminal&rsquo;s default color), &lsquo;<samp>black</samp>&rsquo;, &lsquo;<samp>red</samp>&rsquo;,
&lsquo;<samp>green</samp>&rsquo;, &lsquo;<samp>yellow</samp>&rsquo;, &lsquo;<samp>blue</samp>&rsquo;, &lsquo;<samp>magenta</samp>&rsquo;, &lsquo;<samp>cyan</samp>&rsquo;,
and&lsquo;<samp>white</samp>&rsquo;.
</p>
</dd>
<dt><code>set style filename intensity <var>value</var></code></dt>
<dd><p>Set the intensity to <var>value</var>.  Valid intensities are &lsquo;<samp>normal</samp>&rsquo;
(the default), &lsquo;<samp>bold</samp>&rsquo;, and &lsquo;<samp>dim</samp>&rsquo;.
</p></dd>
</dl>

<p>The <code>show style</code> command and its subcommands are styling
a style name in their output using its own style.
So, use <code>show style</code> to see the complete list of styles,
their characteristics and the visual aspect of each style.
</p>
<p>The style-able objects are:
</p><dl compact="compact">
<dt><code>filename</code></dt>
<dd><p>Control the styling of file names.  By default, this style&rsquo;s
foreground color is green.
</p>
</dd>
<dt><code>function</code></dt>
<dd><p>Control the styling of function names.  These are managed with the
<code>set style function</code> family of commands.  By default, this
style&rsquo;s foreground color is yellow.
</p>
</dd>
<dt><code>variable</code></dt>
<dd><p>Control the styling of variable names.  These are managed with the
<code>set style variable</code> family of commands.  By default, this style&rsquo;s
foreground color is cyan.
</p>
</dd>
<dt><code>address</code></dt>
<dd><p>Control the styling of addresses.  These are managed with the
<code>set style address</code> family of commands.  By default, this style&rsquo;s
foreground color is blue.
</p>
</dd>
<dt><code>title</code></dt>
<dd><p>Control the styling of titles.  These are managed with the
<code>set style title</code> family of commands.  By default, this style&rsquo;s
intensity is bold.  Commands are using the title style to improve
the readability of large output.  For example, the commands
<code>apropos</code> and <code>help</code> are using the title style
for the command names.
</p>
</dd>
<dt><code>highlight</code></dt>
<dd><p>Control the styling of highlightings.  These are managed with the
<code>set style highlight</code> family of commands.  By default, this style&rsquo;s
foreground color is red.  Commands are using the highlight style to draw
the user attention to some specific parts of their output.  For example,
the command <code>apropos -v REGEXP</code> uses the highlight style to
mark the documentation parts matching <var>regexp</var>.
</p>
</dd>
<dt><code>tui-border</code></dt>
<dd><p>Control the styling of the TUI border.  Note that, unlike other
styling options, only the color of the border can be controlled via
<code>set style</code>.  This was done for compatibility reasons, as TUI
controls to set the border&rsquo;s intensity predated the addition of
general styling to <small>GDB</small>.  See <a href="TUI-Configuration.html#TUI-Configuration">TUI Configuration</a>.
</p>
</dd>
<dt><code>tui-active-border</code></dt>
<dd><p>Control the styling of the active TUI border; that is, the TUI window
that has the focus.
</p>
</dd>
</dl>

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