119 lines
5.3 KiB
HTML
119 lines
5.3 KiB
HTML
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<!DOCTYPE html>
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<html>
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<!-- Created by GNU Texinfo 7.1, https://www.gnu.org/software/texinfo/ -->
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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<!-- This manual documents Guile version 3.0.10.
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Copyright (C) 1996-1997, 2000-2005, 2009-2023 Free Software Foundation,
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Inc.
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Copyright (C) 2021 Maxime Devos
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Copyright (C) 2024 Tomas Volf
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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 no
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Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A
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copy of the license is included in the section entitled "GNU Free
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Documentation License." -->
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<title>Loading Readline Support (Guile Reference Manual)</title>
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<meta name="description" content="Loading Readline Support (Guile Reference Manual)">
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<meta name="keywords" content="Loading Readline Support (Guile Reference Manual)">
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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=".texi2any-real">
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<meta name="viewport" content="width=device-width,initial-scale=1">
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<link href="index.html" rel="start" title="Top">
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<link href="Concept-Index.html" 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-Support.html" rel="up" title="Readline Support">
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<link href="Readline-Options.html" rel="next" title="Readline Options">
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<style type="text/css">
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<!--
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a.copiable-link {visibility: hidden; text-decoration: none; line-height: 0em}
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div.example {margin-left: 3.2em}
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span:hover a.copiable-link {visibility: visible}
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-->
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</style>
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<link rel="stylesheet" type="text/css" href="https://www.gnu.org/software/gnulib/manual.css">
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</head>
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<body lang="en">
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<div class="subsection-level-extent" id="Loading-Readline-Support">
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<div class="nav-panel">
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<p>
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Next: <a href="Readline-Options.html" accesskey="n" rel="next">Readline Options</a>, Up: <a href="Readline-Support.html" accesskey="u" rel="up">Readline Support</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html" title="Index" rel="index">Index</a>]</p>
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</div>
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<hr>
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<h4 class="subsection" id="Loading-Readline-Support-1"><span>7.9.1 Loading Readline Support<a class="copiable-link" href="#Loading-Readline-Support-1"> ¶</a></span></h4>
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<p>The module is not loaded by default and so has to be loaded and
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activated explicitly. This is done with two simple lines of code:
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</p>
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<div class="example lisp">
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<pre class="lisp-preformatted">(use-modules (ice-9 readline))
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(activate-readline)
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</pre></div>
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<p>The first line will load the necessary code, and the second will
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activate readline’s features for the REPL. If you plan to use this
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module often, you should save these to lines to your <samp class="file">.guile</samp>
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personal startup file.
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</p>
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<p>You will notice that the REPL’s behavior changes a bit when you have
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loaded the readline module. For example, when you press Enter before
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typing in the closing parentheses of a list, you will see the
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<em class="dfn">continuation</em> prompt, three dots: <code class="code">...</code> This gives you a nice
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visual feedback when trying to match parentheses. To make this even
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easier, <em class="dfn">bouncing parentheses</em> are implemented. That means that
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when you type in a closing parentheses, the cursor will jump to the
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corresponding opening parenthesis for a short time, making it trivial to make
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them match.
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</p>
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<p>Once the readline module is activated, all lines entered interactively
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will be stored in a history and can be recalled later using the
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cursor-up and -down keys. Readline also understands the Emacs keys for
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navigating through the command line and history.
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</p>
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<a class="index-entry-id" id="index-_002eguile_005fhistory"></a>
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<p>When you quit your Guile session by evaluating <code class="code">(quit)</code> or pressing
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Ctrl-D, the history will be saved to the file <samp class="file">.guile_history</samp> and
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read in when you start Guile for the next time. Thus you can start a
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new Guile session and still have the (probably long-winded) definition
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expressions available.
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</p>
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<a class="index-entry-id" id="index-GUILE_005fHISTORY"></a>
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<a class="index-entry-id" id="index-_002einputrc"></a>
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<p>You can specify a different history file by setting the environment
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variable <code class="env">GUILE_HISTORY</code>. And you can make Guile specific
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customizations to your <samp class="file">.inputrc</samp> by testing for application
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‘<samp class="samp">Guile</samp>’ (see <a data-manual="readline" href="https://tiswww.cwru.edu/php/chet/readline/readline.html#Conditional-Init-Constructs">Conditional Init Constructs</a> in <cite class="cite">GNU
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Readline Library</cite>). For instance to define a key inserting a matched
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pair of parentheses,
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</p>
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<div class="example">
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<pre class="example-preformatted">$if Guile
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"\C-o": "()\C-b"
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$endif
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</pre></div>
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</div>
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<hr>
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<div class="nav-panel">
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<p>
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Next: <a href="Readline-Options.html">Readline Options</a>, Up: <a href="Readline-Support.html">Readline Support</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html" 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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