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152 lines
6.7 KiB
HTML
152 lines
6.7 KiB
HTML
4 years ago
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html>
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<!-- Copyright (C) 1988-2019 Free Software Foundation, Inc.
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Permission is granted to copy, distribute and/or modify this document
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under the terms of the GNU Free Documentation License, Version 1.3 or
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any later version published by the Free Software Foundation; with the
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Invariant Sections being "Free Software" and "Free Software Needs
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Free Documentation", with the Front-Cover Texts being "A GNU Manual,"
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and with the Back-Cover Texts as in (a) below.
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(a) The FSF's Back-Cover Text is: "You are free to copy and modify
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this GNU Manual. Buying copies from GNU Press supports the FSF in
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developing GNU and promoting software freedom." -->
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<!-- Created by GNU Texinfo 6.4, http://www.gnu.org/software/texinfo/ -->
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<head>
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<title>Conditional Init Constructs (Debugging with GDB)</title>
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<meta name="description" content="Conditional Init Constructs (Debugging with GDB)">
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<meta name="keywords" content="Conditional Init Constructs (Debugging with GDB)">
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<meta name="resource-type" content="document">
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<meta name="distribution" content="global">
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<meta name="Generator" content="makeinfo">
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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<link href="index.html#Top" rel="start" title="Top">
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<link href="Concept-Index.html#Concept-Index" rel="index" title="Concept Index">
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<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
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<link href="Readline-Init-File.html#Readline-Init-File" rel="up" title="Readline Init File">
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<link href="Sample-Init-File.html#Sample-Init-File" rel="next" title="Sample Init File">
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<link href="Readline-Init-File-Syntax.html#Readline-Init-File-Syntax" rel="prev" title="Readline Init File Syntax">
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<style type="text/css">
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-->
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</style>
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</head>
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<body lang="en">
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<a name="Conditional-Init-Constructs"></a>
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<div class="header">
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<p>
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Next: <a href="Sample-Init-File.html#Sample-Init-File" accesskey="n" rel="next">Sample Init File</a>, Previous: <a href="Readline-Init-File-Syntax.html#Readline-Init-File-Syntax" accesskey="p" rel="prev">Readline Init File Syntax</a>, Up: <a href="Readline-Init-File.html#Readline-Init-File" accesskey="u" rel="up">Readline Init File</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html#Concept-Index" title="Index" rel="index">Index</a>]</p>
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</div>
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<hr>
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<a name="Conditional-Init-Constructs-1"></a>
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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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</p>
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<dl compact="compact">
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<dt><code>$if</code></dt>
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<dd><p>The <code>$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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</p>
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<dl compact="compact">
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<dt><code>mode</code></dt>
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<dd><p>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>set keymap</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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</p>
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</dd>
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<dt><code>term</code></dt>
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<dd><p>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>=</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>-</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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</p>
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</dd>
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<dt><code>application</code></dt>
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<dd><p>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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</p><div class="example">
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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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$endif
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</pre></div>
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</dd>
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</dl>
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</dd>
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<dt><code>$endif</code></dt>
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<dd><p>This command, as seen in the previous example, terminates an
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<code>$if</code> command.
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</p>
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</dd>
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<dt><code>$else</code></dt>
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<dd><p>Commands in this branch of the <code>$if</code> directive are executed if
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the test fails.
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</p>
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</dd>
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<dt><code>$include</code></dt>
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<dd><p>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>/etc/inputrc</samp>:
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</p><div class="example">
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<pre class="example">$include /etc/inputrc
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</pre></div>
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</dd>
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</dl>
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<hr>
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<div class="header">
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<p>
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Next: <a href="Sample-Init-File.html#Sample-Init-File" accesskey="n" rel="next">Sample Init File</a>, Previous: <a href="Readline-Init-File-Syntax.html#Readline-Init-File-Syntax" accesskey="p" rel="prev">Readline Init File Syntax</a>, Up: <a href="Readline-Init-File.html#Readline-Init-File" accesskey="u" rel="up">Readline Init File</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html#Concept-Index" title="Index" rel="index">Index</a>]</p>
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</div>
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</body>
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</html>
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