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| author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-15 19:44:05 +0000 |
|---|---|---|
| committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-15 19:44:05 +0000 |
| commit | d318611dd6f23fcfedd50e9b9e24620b102ba96a (patch) | |
| tree | 8b9eef82ca40fdd5a8deeabf07572074c236095d /doc/groff.html.node/if_002dthen.html | |
| parent | Initial commit. (diff) | |
| download | groff-upstream/1.23.0.tar.xz groff-upstream/1.23.0.zip | |
Adding upstream version 1.23.0.upstream/1.23.0upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'doc/groff.html.node/if_002dthen.html')
| -rw-r--r-- | doc/groff.html.node/if_002dthen.html | 111 |
1 files changed, 111 insertions, 0 deletions
diff --git a/doc/groff.html.node/if_002dthen.html b/doc/groff.html.node/if_002dthen.html new file mode 100644 index 0000000..e2fba2b --- /dev/null +++ b/doc/groff.html.node/if_002dthen.html @@ -0,0 +1,111 @@ +<!DOCTYPE html> +<html> +<!-- Created by GNU Texinfo 7.0.3, https://www.gnu.org/software/texinfo/ --> +<head> +<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1"> +<!-- This manual documents GNU troff version 1.23.0. + +Copyright © 1994-2023 Free Software Foundation, Inc. + +Permission is granted to copy, distribute and/or modify this document +under the terms of the GNU Free Documentation License, Version 1.3 or +any later version published by the Free Software Foundation; with no +Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A +copy of the license is included in the section entitled "GNU Free +Documentation License". --> +<title>if-then (The GNU Troff Manual)</title> + +<meta name="description" content="if-then (The GNU Troff Manual)"> +<meta name="keywords" content="if-then (The GNU Troff Manual)"> +<meta name="resource-type" content="document"> +<meta name="distribution" content="global"> +<meta name="Generator" content="makeinfo"> +<meta name="viewport" content="width=device-width,initial-scale=1"> + +<link href="index.html" rel="start" title="Top"> +<link href="Request-Index.html" rel="index" title="Request Index"> +<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents"> +<link href="Conditionals-and-Loops.html" rel="up" title="Conditionals and Loops"> +<link href="if_002delse.html" rel="next" title="if-else"> +<link href="Operators-in-Conditionals.html" rel="prev" title="Operators in Conditionals"> +<style type="text/css"> +<!-- +a.copiable-link {visibility: hidden; text-decoration: none; line-height: 0em} +div.example {margin-left: 3.2em} +span:hover a.copiable-link {visibility: visible} +strong.def-name {font-family: monospace; font-weight: bold; font-size: larger} +--> +</style> + + +</head> + +<body lang="en"> +<div class="subsection-level-extent" id="if_002dthen"> +<div class="nav-panel"> +<p> +Next: <a href="if_002delse.html" accesskey="n" rel="next">if-else</a>, Previous: <a href="Operators-in-Conditionals.html" accesskey="p" rel="prev">Operators in Conditionals</a>, Up: <a href="Conditionals-and-Loops.html" accesskey="u" rel="up">Conditionals and Loops</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Request-Index.html" title="Index" rel="index">Index</a>]</p> +</div> +<hr> +<h4 class="subsection" id="if_002dthen-1">5.23.2 if-then</h4> +<a class="index-entry-id" id="index-if_002dthen"></a> + +<dl class="first-deffn"> +<dt class="deffn" id="index-_002eif"><span class="category-def">Request: </span><span><strong class="def-name"><code class="t">.if</code></strong> <var class="def-var-arguments">cond-expr anything</var><a class="copiable-link" href='#index-_002eif'> ¶</a></span></dt> +<dd><a class="index-entry-id" id="index-if"></a> +<p>Evaluate the conditional expression <var class="var">cond-expr</var>, and if it evaluates +true (or to a positive value), interpret the remainder of the line +<var class="var">anything</var> as if it were an input line. Recall from <a class="ref" href="Invoking-Requests.html">Invoking Requests</a> that any quantity of spaces between arguments to requests +serves only to separate them; leading spaces in <var class="var">anything</var> are thus +not seen. <var class="var">anything</var> effectively <em class="emph">cannot</em> be omitted; if +<var class="var">cond-expr</var> is true and <var class="var">anything</var> is empty, the newline at the +end of the control line is interpreted as a blank input line (and +therefore a blank text line). +</p> +<div class="example"> +<div class="group"><pre class="example-preformatted">super\c +tanker +.nr force-word-break 1 +super\c +.if ((\n[force-word-break] = 1) & \n[.int]) +tanker + ⇒ supertanker super tanker +</pre></div></div> +</dd></dl> + +<dl class="first-deffn"> +<dt class="deffn" id="index-_002enop"><span class="category-def">Request: </span><span><strong class="def-name"><code class="t">.nop</code></strong> <var class="def-var-arguments">anything</var><a class="copiable-link" href='#index-_002enop'> ¶</a></span></dt> +<dd><a class="index-entry-id" id="index-nop"></a> +<p>Interpret <var class="var">anything</var> as if it were an input line. This is similar +to ‘<samp class="samp">.if 1</samp>’. <code class="code">nop</code> is not really “no operation”; its +argument <em class="emph">is</em> processed—unconditionally. It can be used to cause +text lines to share indentation with surrounding control lines. +</p> +<div class="example"> +<div class="group"><pre class="example-preformatted">.als real-MAC MAC +.de wrapped-MAC +. tm MAC: called with arguments \\$@ +. nop \\*[real-MAC]\\ +.. +.als MAC wrapped-MAC +\# Later... +.als MAC real-MAC +</pre></div></div> + +<p>In the above, we’ve used aliasing, <code class="code">nop</code>, and the interpolation of +a macro as a string to interpose a wrapper around the macro ‘<samp class="samp">MAC</samp>’ +(perhaps to debug it). +</p></dd></dl> + + +</div> +<hr> +<div class="nav-panel"> +<p> +Next: <a href="if_002delse.html">if-else</a>, Previous: <a href="Operators-in-Conditionals.html">Operators in Conditionals</a>, Up: <a href="Conditionals-and-Loops.html">Conditionals and Loops</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Request-Index.html" title="Index" rel="index">Index</a>]</p> +</div> + + + +</body> +</html> |