diff options
Diffstat (limited to '')
| -rw-r--r-- | doc/groff.html.node/Invoking-Requests.html | 143 |
1 files changed, 143 insertions, 0 deletions
diff --git a/doc/groff.html.node/Invoking-Requests.html b/doc/groff.html.node/Invoking-Requests.html new file mode 100644 index 0000000..1864553 --- /dev/null +++ b/doc/groff.html.node/Invoking-Requests.html @@ -0,0 +1,143 @@ +<!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>Invoking Requests (The GNU Troff Manual)</title> + +<meta name="description" content="Invoking Requests (The GNU Troff Manual)"> +<meta name="keywords" content="Invoking Requests (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="Formatter-Instructions.html" rel="up" title="Formatter Instructions"> +<link href="Calling-Macros.html" rel="next" title="Calling Macros"> +<link href="Control-Characters.html" rel="prev" title="Control Characters"> +<style type="text/css"> +<!-- +div.example {margin-left: 3.2em} +--> +</style> + + +</head> + +<body lang="en"> +<div class="subsection-level-extent" id="Invoking-Requests"> +<div class="nav-panel"> +<p> +Next: <a href="Calling-Macros.html" accesskey="n" rel="next">Calling Macros</a>, Previous: <a href="Control-Characters.html" accesskey="p" rel="prev">Control Characters</a>, Up: <a href="Formatter-Instructions.html" accesskey="u" rel="up">Formatter Instructions</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="Invoking-Requests-1">5.6.2 Invoking Requests</h4> +<a class="index-entry-id" id="index-invoking-requests"></a> +<a class="index-entry-id" id="index-requests_002c-invoking"></a> + +<p>A control character is optionally followed by tabs and/or spaces and +then an identifier naming a request or macro. The invocation of an +unrecognized request is interpreted as a macro call. Defining a macro +with the same name as a request replaces the request. Deleting a +request name with the <code class="code">rm</code> request makes it unavailable. The +<code class="code">als</code> request can alias requests, permitting them to be wrapped or +non-destructively replaced. See <a class="xref" href="Strings.html">Strings</a>. +</p> +<a class="index-entry-id" id="index-request-arguments"></a> +<a class="index-entry-id" id="index-arguments-to-requests"></a> +<a class="index-entry-id" id="index-tabs_002c-and-macro-arguments"></a> +<a class="index-entry-id" id="index-macro-arguments_002c-and-tabs"></a> +<a class="index-entry-id" id="index-arguments-to-macros_002c-and-tabs"></a> +<a class="index-entry-id" id="index-tabs_002c-and-request-arguments"></a> +<a class="index-entry-id" id="index-request-arguments_002c-and-tabs"></a> +<a class="index-entry-id" id="index-arguments-to-requests_002c-and-tabs"></a> +<p>There is no inherent limit on argument length or quantity. Most +requests take one or more arguments, and ignore any they do not expect. +A request may be separated from its arguments by tabs or spaces, but +only spaces can separate an argument from its successor. Only one +between arguments is necessary; any excess is ignored. GNU <code class="code">troff</code> +does not allow tabs for argument separation.<a class="footnote" id="DOCF43" href="groff.html_fot.html#FOOT43"><sup>43</sup></a> +</p> +<p>Generally, a space <em class="emph">within</em> a request argument is not relevant, not +meaningful, or is supported by bespoke provisions, as with the <code class="code">tl</code> +request’s delimiters (see <a class="pxref" href="Page-Layout.html">Page Layout</a>). Some requests, like +<code class="code">ds</code>, interpret the remainder of the control line as a single +argument. See <a class="xref" href="Strings.html">Strings</a>. +</p> +<a class="index-entry-id" id="index-structuring-source-code-of-documents-or-macro-packages"></a> +<a class="index-entry-id" id="index-documents_002c-structuring-the-source-of"></a> +<a class="index-entry-id" id="index-macro-package_002c-structuring-the-source-of"></a> +<a class="index-entry-id" id="index-package_002c-package_002c-structuring-the-source-of"></a> +<a class="index-entry-id" id="index-indentation_002c-of-roff-source-code"></a> +<p>Spaces and tabs immediately after a control character are ignored. +Commonly, authors structure the source of documents or macro files with +them. +</p> +<div class="example"> +<div class="group"><pre class="example-preformatted">.de center +. if \\n[.br] \ +. br +. ce \\$1 +.. +. +. +.de right-align +.→if \\n[.br] \ +.→→br +.→rj \\$1 +.. +</pre></div></div> + +<a class="index-entry-id" id="index-blank-line-trap-_0028blm_0029"></a> +<a class="index-entry-id" id="index-blank-line-macro-_0028blm_0029-1"></a> +<p>If you assign an empty blank line trap, you can separate macro +definitions (or any input lines) with blank lines. +</p> +<div class="example"> +<div class="group"><pre class="example-preformatted">.de do-nothing +.. +.blm do-nothing \" activate blank line trap + +.de center +. if \\n[.br] \ +. br +. ce \\$1 +.. + + +.de right-align +.→if \\n[.br] \ +.→→br +.→rj \\$1 +.. + +.blm \" deactivate blank line trap +</pre></div></div> + +<p>See <a class="xref" href="Blank-Line-Traps.html">Blank Line Traps</a>. +</p> + +</div> +<hr> +<div class="nav-panel"> +<p> +Next: <a href="Calling-Macros.html">Calling Macros</a>, Previous: <a href="Control-Characters.html">Control Characters</a>, Up: <a href="Formatter-Instructions.html">Formatter Instructions</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> |