107 lines
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107 lines
5.0 KiB
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<title>Conditional Init Constructs - Debugging with GDB</title>
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<link title="Top" rel="start" href="index.html#Top">
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<link rel="up" href="Readline-Init-File.html#Readline-Init-File" title="Readline Init File">
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<link rel="prev" href="Readline-Init-File-Syntax.html#Readline-Init-File-Syntax" title="Readline Init File Syntax">
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<link rel="next" href="Sample-Init-File.html#Sample-Init-File" title="Sample Init File">
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<div class="node">
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<a name="Conditional-Init-Constructs"></a>
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<p>
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Next: <a rel="next" accesskey="n" href="Sample-Init-File.html#Sample-Init-File">Sample Init File</a>,
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Previous: <a rel="previous" accesskey="p" href="Readline-Init-File-Syntax.html#Readline-Init-File-Syntax">Readline Init File Syntax</a>,
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Up: <a rel="up" accesskey="u" href="Readline-Init-File.html#Readline-Init-File">Readline Init File</a>
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<hr>
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</div>
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<h4 class="subsection">32.3.2 Conditional Init Constructs</h4>
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<p>Readline implements a facility similar in spirit to the conditional
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compilation features of the C preprocessor which allows key
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bindings and variable settings to be performed as the result
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of tests. There are four parser directives used.
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<dl>
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<dt><code>$if</code><dd>The <code>$if</code> construct allows bindings to be made based on the
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editing mode, the terminal being used, or the application using
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Readline. The text of the test extends to the end of the line;
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no characters are required to isolate it.
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<dl>
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<dt><code>mode</code><dd>The <code>mode=</code> form of the <code>$if</code> directive is used to test
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whether Readline is in <code>emacs</code> or <code>vi</code> mode.
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This may be used in conjunction
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with the ‘<samp><span class="samp">set keymap</span></samp>’ command, for instance, to set bindings in
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the <code>emacs-standard</code> and <code>emacs-ctlx</code> keymaps only if
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Readline is starting out in <code>emacs</code> mode.
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<br><dt><code>term</code><dd>The <code>term=</code> form may be used to include terminal-specific
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key bindings, perhaps to bind the key sequences output by the
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terminal's function keys. The word on the right side of the
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‘<samp><span class="samp">=</span></samp>’ is tested against both the full name of the terminal and
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the portion of the terminal name before the first ‘<samp><span class="samp">-</span></samp>’. This
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allows <code>sun</code> to match both <code>sun</code> and <code>sun-cmd</code>,
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for instance.
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<br><dt><code>application</code><dd>The <var>application</var> construct is used to include
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application-specific settings. Each program using the Readline
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library sets the <var>application name</var>, and you can test for
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a particular value.
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This could be used to bind key sequences to functions useful for
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a specific program. For instance, the following command adds a
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key sequence that quotes the current or previous word in Bash:
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<pre class="example"> $if Bash
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# Quote the current or previous word
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"\C-xq": "\eb\"\ef\""
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$endif
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</pre>
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</dl>
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<br><dt><code>$endif</code><dd>This command, as seen in the previous example, terminates an
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<code>$if</code> command.
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<br><dt><code>$else</code><dd>Commands in this branch of the <code>$if</code> directive are executed if
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the test fails.
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<br><dt><code>$include</code><dd>This directive takes a single filename as an argument and reads commands
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and bindings from that file.
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For example, the following directive reads from <samp><span class="file">/etc/inputrc</span></samp>:
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<pre class="example"> $include /etc/inputrc
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</pre>
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</dl>
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</body></html>
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