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| author | Indrajith K L | 2022-12-03 17:00:20 +0530 |
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| committer | Indrajith K L | 2022-12-03 17:00:20 +0530 |
| commit | f5c4671bfbad96bf346bd7e9a21fc4317b4959df (patch) | |
| tree | 2764fc62da58f2ba8da7ed341643fc359873142f /ctags/docs/option-file.html | |
| download | cli-tools-windows-master.tar.gz cli-tools-windows-master.tar.bz2 cli-tools-windows-master.zip | |
Diffstat (limited to 'ctags/docs/option-file.html')
| -rw-r--r-- | ctags/docs/option-file.html | 284 |
1 files changed, 284 insertions, 0 deletions
diff --git a/ctags/docs/option-file.html b/ctags/docs/option-file.html new file mode 100644 index 0000000..412d8d5 --- /dev/null +++ b/ctags/docs/option-file.html @@ -0,0 +1,284 @@ + +<!DOCTYPE html> + +<html> + <head> + <meta charset="utf-8" /> + <meta name="viewport" content="width=device-width, initial-scale=1.0" /><meta name="generator" content="Docutils 0.17.1: http://docutils.sourceforge.net/" /> + + <title>Option files — Universal Ctags 0.3.0 documentation</title> + <link rel="stylesheet" type="text/css" href="_static/pygments.css" /> + <link rel="stylesheet" type="text/css" href="_static/classic.css" /> + + <script data-url_root="./" id="documentation_options" src="_static/documentation_options.js"></script> + <script src="_static/jquery.js"></script> + <script src="_static/underscore.js"></script> + <script src="_static/doctools.js"></script> + + <link rel="index" title="Index" href="genindex.html" /> + <link rel="search" title="Search" href="search.html" /> + <link rel="next" title="Output formats" href="output-format.html" /> + <link rel="prev" title="XSLT parser" href="parser-xslt.html" /> + </head><body> + <div class="related" role="navigation" aria-label="related navigation"> + <h3>Navigation</h3> + <ul> + <li class="right" style="margin-right: 10px"> + <a href="genindex.html" title="General Index" + accesskey="I">index</a></li> + <li class="right" > + <a href="output-format.html" title="Output formats" + accesskey="N">next</a> |</li> + <li class="right" > + <a href="parser-xslt.html" title="XSLT parser" + accesskey="P">previous</a> |</li> + <li class="nav-item nav-item-0"><a href="index.html">Universal Ctags 0.3.0 documentation</a> »</li> + <li class="nav-item nav-item-this"><a href="">Option files</a></li> + </ul> + </div> + + <div class="document"> + <div class="documentwrapper"> + <div class="bodywrapper"> + <div class="body" role="main"> + + <section id="option-files"> +<span id="id1"></span><h1>Option files<a class="headerlink" href="#option-files" title="Permalink to this headline">¶</a></h1> +<p>An “option file” is a file in which command line options are written line +by line. <code class="docutils literal notranslate"><span class="pre">ctags</span></code> loads it and runs as if the options in the file were +passed through command line.</p> +<p>The following file is an example of an option file:</p> +<div class="highlight-ctags notranslate"><div class="highlight"><pre><span></span><span class="c1"># Exclude directories that don't contain real code</span> +--exclude=Units +<span class="w"> </span><span class="c1"># indentation is ignored</span> +<span class="w"> </span>--exclude=tinst-root +--exclude=Tmain +</pre></div> +</div> +<p>The character <cite>#</cite> can be used as a start marker of a line comment. +Whitespaces at the start of lines are ignored during loading.</p> +<p>And it works exactly as if we had called:</p> +<div class="highlight-sh notranslate"><div class="highlight"><pre><span></span>ctags --exclude<span class="o">=</span>Units --exclude<span class="o">=</span>tinst-root --exclude<span class="o">=</span>Tmain +</pre></div> +</div> +<section id="order-of-loading-option-files"> +<h2>Order of loading option files<a class="headerlink" href="#order-of-loading-option-files" title="Permalink to this headline">¶</a></h2> +<p>Option files are loaded by <code class="docutils literal notranslate"><span class="pre">ctags</span></code> automatically at start-up time.</p> +<p>Which files are loaded at start-up time are very different from Exuberant Ctags. +See <a class="reference internal" href="#option-file-difference"><span class="std std-ref">Difference from Exuberant Ctags</span></a> for the differences and their intentions.</p> +<p>At start-up time, <code class="docutils literal notranslate"><span class="pre">ctags</span></code> loads files having <code class="file docutils literal notranslate"><span class="pre">.ctags</span></code> as a +file extension under the following statically defined directories:</p> +<ol class="arabic simple"> +<li><p><code class="file docutils literal notranslate"><span class="pre">$XDG_CONFIG_HOME/ctags/</span></code>, or <code class="file docutils literal notranslate"><span class="pre">$HOME/.config/ctags/</span></code> if <code class="file docutils literal notranslate"><span class="pre">$XDG_CONFIG_HOME</span></code> is not defined (on other than Windows)</p></li> +<li><p><code class="file docutils literal notranslate"><span class="pre">$HOME/.ctags.d/</span></code></p></li> +<li><p><code class="file docutils literal notranslate"><span class="pre">$HOMEDRIVE$HOMEPATH/ctags.d/</span></code> (on Windows)</p></li> +<li><p><code class="file docutils literal notranslate"><span class="pre">./.ctags.d/</span></code></p></li> +<li><p><code class="file docutils literal notranslate"><span class="pre">./ctags.d/</span></code></p></li> +</ol> +<p><code class="docutils literal notranslate"><span class="pre">ctags</span></code> visits the directories in the order listed above for preloading files. +<code class="docutils literal notranslate"><span class="pre">ctags</span></code> loads files having <code class="file docutils literal notranslate"><span class="pre">.ctags</span></code> as file extension in alphabetical +order (<code class="docutils literal notranslate"><span class="pre">strcmp(3)</span></code> is used for comparing, so for example +<code class="file docutils literal notranslate"><span class="pre">.ctags.d/ZZZ.ctags</span></code> will be loaded <em>before</em> <code class="file docutils literal notranslate"><span class="pre">.ctags.d/aaa.ctags</span></code> in an ordinary locale).</p> +<p>If a option file includes <code class="docutils literal notranslate"><span class="pre">--options=PATHNAME</span></code> option, specified files are +loaded immediately as described in the next section. <code class="docutils literal notranslate"><span class="pre">ctags</span></code> load a option +file only once if it is specified multiple times.</p> +<p>Finally if <code class="docutils literal notranslate"><span class="pre">--options=PATHNAME</span></code> option is specified on <code class="docutils literal notranslate"><span class="pre">ctags</span></code> command line, +option files specified are load.</p> +</section> +<section id="options-pathname-option"> +<h2><code class="docutils literal notranslate"><span class="pre">--options=PATHNAME</span></code> option<a class="headerlink" href="#options-pathname-option" title="Permalink to this headline">¶</a></h2> +<p>Exuberant Ctags also has the <code class="docutils literal notranslate"><span class="pre">--options</span></code> option, but you can only specify a +single file to load. Universal Ctags extends the option in two aspects:</p> +<ul class="simple"> +<li><p>You can specify a directory, to load all the files in that directory.</p></li> +<li><p>You can specify a PATH list to look in. See next section for details.</p></li> +</ul> +<section id="specifying-a-directory"> +<h3>Specifying a directory<a class="headerlink" href="#specifying-a-directory" title="Permalink to this headline">¶</a></h3> +<p>If you specify a directory instead of a file as the argument for the +<code class="docutils literal notranslate"><span class="pre">--options=PATHNAME</span></code>, <code class="docutils literal notranslate"><span class="pre">ctags</span></code> will load all files having a +<code class="file docutils literal notranslate"><span class="pre">.ctags</span></code> extension under said directory in alphabetical order.</p> +</section> +<section id="specifying-an-optlib-path-list"> +<h3>Specifying an optlib PATH list<a class="headerlink" href="#specifying-an-optlib-path-list" title="Permalink to this headline">¶</a></h3> +<p>Much like a command line shell, <code class="docutils literal notranslate"><span class="pre">ctags</span></code> has an <em>optlib PATH list</em> in which it +can look for a file (or directory) to load.</p> +<p>When loading a file (or directory) specified with <code class="docutils literal notranslate"><span class="pre">--options=PATHNAME</span></code>, +ctags first checks if <code class="docutils literal notranslate"><span class="pre">PATHNAME</span></code> is an absolute path or a relative path. +An absolute path starts with ‘<code class="docutils literal notranslate"><span class="pre">/</span></code>’ or ‘<code class="docutils literal notranslate"><span class="pre">.</span></code>’. +If <code class="docutils literal notranslate"><span class="pre">PATHNAME</span></code> is an absolute path, ctags tries to load it immediately.</p> +<p>If, on the contrary, is a relative path, <code class="docutils literal notranslate"><span class="pre">ctags</span></code> does two things: First, +looks for the file (or directory) in <em>optlib PATH list</em> and tries to load it.</p> +<p>If the file doesn’t exist in the PATH list, <code class="docutils literal notranslate"><span class="pre">ctags</span></code> treats <code class="docutils literal notranslate"><span class="pre">PATHNAME</span></code> as a +path relative to the working directory and loads the file.</p> +<p>By default, <em>optlib PATH list</em> is empty. To set or add a directory +path to the list, use <code class="docutils literal notranslate"><span class="pre">--optlib-dir=PATH</span></code>.</p> +<p>For setting (adding one after clearing):</p> +<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="o">--</span><span class="n">optlib</span><span class="o">-</span><span class="nb">dir</span><span class="o">=</span><span class="n">PATH</span> +</pre></div> +</div> +<p>For adding on the beginning of the PATH list:</p> +<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="o">--</span><span class="n">optlib</span><span class="o">-</span><span class="nb">dir</span><span class="o">=+</span><span class="n">PATH</span> +</pre></div> +</div> +</section> +</section> +<section id="tips-for-writing-an-option-file"> +<h2>Tips for writing an option file<a class="headerlink" href="#tips-for-writing-an-option-file" title="Permalink to this headline">¶</a></h2> +<ul class="simple"> +<li><p>Use <code class="docutils literal notranslate"><span class="pre">--quiet</span> <span class="pre">--options=NONE</span></code> to disable preloading.</p></li> +<li><p><code class="docutils literal notranslate"><span class="pre">--_echo=MSG</span></code> and <code class="docutils literal notranslate"><span class="pre">--_force-quit=[NUM]</span></code> options are introduced for +debugging the process of loading option files. See “OPTIONS” +section of <a class="reference internal" href="man/ctags-optlib.7.html#ctags-optlib-7"><span class="std std-ref">ctags-optlib(7)</span></a>.</p></li> +<li><p>Universal Ctags has an <code class="docutils literal notranslate"><span class="pre">optlib2c</span></code> script that translates an option file +into C source code. Your optlib parser can thus easily become a built-in parser. +See <a class="reference internal" href="optlib.html#optlib2c"><span class="std std-ref">Translating an option file into C source code (optlib2c)</span></a> for details.</p></li> +</ul> +</section> +<section id="difference-from-exuberant-ctags"> +<span id="option-file-difference"></span><h2>Difference from Exuberant Ctags<a class="headerlink" href="#difference-from-exuberant-ctags" title="Permalink to this headline">¶</a></h2> +<p>Quoted from man page of Exuberant Ctags:</p> +<blockquote> +<div><dl class="simple"> +<dt>FILES</dt><dd><ul class="simple"> +<li><p>/ctags.cnf (on MSDOS, MSWindows only)</p></li> +<li><p>/etc/ctags.conf</p></li> +<li><p>/usr/local/etc/ctags.conf</p></li> +<li><p>$HOME/.ctags</p></li> +<li><p>$HOME/ctags.cnf (on MSDOS, MSWindows only)</p></li> +<li><p>.ctags</p></li> +<li><p>ctags.cnf (on MSDOS, MSWindows only)</p></li> +</ul> +</dd> +</dl> +<p>If any of these configuration files exist, each will +be expected to contain a set of default options +which are read in the order listed when ctags +starts, but before the CTAGS environment variable is +read or any command line options are read. This +makes it possible to set up site-wide, personal or +project-level defaults. It is possible to compile +ctags to read an additional configuration file +before any of those shown above, which will be +indicated if the output produced by the --version +option lists the “custom-conf” feature. Options +appearing in the CTAGS environment variable or on +the command line will override options specified in +these files. Only options will be read from these +files. Note that the option files are read in +line-oriented mode in which spaces are significant +(since shell quoting is not possible). Each line of +the file is read as one command line parameter (as +if it were quoted with single quotes). Therefore, +use new lines to indicate separate command-line +arguments.</p> +</div></blockquote> +<p>What follows explains the differences and their intentions…</p> +<section id="directory-oriented-configuration-management"> +<h3>Directory oriented configuration management<a class="headerlink" href="#directory-oriented-configuration-management" title="Permalink to this headline">¶</a></h3> +<p>Exuberant Ctags provides a way to customize ctags with options like +<code class="docutils literal notranslate"><span class="pre">--langdef=<LANG></span></code> and <code class="docutils literal notranslate"><span class="pre">--regex-<LANG></span></code>. These options are +powerful and make ctags popular for programmers.</p> +<p>Universal Ctags extends this idea; we have added new options for +defining a parser, and have extended existing options. Defining +a new parser with the options is more than “customizing” in +Universal Ctags.</p> +<p>To make easier the maintenance a parser defined using the options, you can put +each language parser in a different options file. Universal Ctags doesn’t +preload a single file. Instead, Universal Ctags loads all the files having the +<code class="file docutils literal notranslate"><span class="pre">.ctags</span></code> extension under the previously specified directories. If you +have multiple parser definitions, put them in different files.</p> +</section> +<section id="avoiding-option-incompatibility-issues"> +<h3>Avoiding option incompatibility issues<a class="headerlink" href="#avoiding-option-incompatibility-issues" title="Permalink to this headline">¶</a></h3> +<p>The Universal Ctags options are different from those of Exuberant Ctags, +therefore Universal Ctags doesn’t load any of the files Exuberant Ctags loads at +start-up. Otherwise there would be incompatibility issues if Exuberant Ctags +loaded an option file that used a newly introduced option in Universal Ctags, +and vice versa.</p> +</section> +<section id="no-system-wide-configuration"> +<h3>No system wide configuration<a class="headerlink" href="#no-system-wide-configuration" title="Permalink to this headline">¶</a></h3> +<p>To make the preload path list short and because it was rarely ever used, +Universal Ctags does not load any option files for system wide configuration. +(i.e., no <code class="file docutils literal notranslate"><span class="pre">/etc/ctags.d</span></code>)</p> +</section> +<section id="using-ctags-for-the-file-extension"> +<h3>Using <code class="file docutils literal notranslate"><span class="pre">.ctags</span></code> for the file extension<a class="headerlink" href="#using-ctags-for-the-file-extension" title="Permalink to this headline">¶</a></h3> +<p>Extensions <code class="file docutils literal notranslate"><span class="pre">.cnf</span></code> and <code class="file docutils literal notranslate"><span class="pre">.conf</span></code> are obsolete. +Use the unified extension <code class="file docutils literal notranslate"><span class="pre">.ctags</span></code> only.</p> +</section> +</section> +</section> + + + <div class="clearer"></div> + </div> + </div> + </div> + <div class="sphinxsidebar" role="navigation" aria-label="main navigation"> + <div class="sphinxsidebarwrapper"> + <h3><a href="index.html">Table of Contents</a></h3> + <ul> +<li><a class="reference internal" href="#">Option files</a><ul> +<li><a class="reference internal" href="#order-of-loading-option-files">Order of loading option files</a></li> +<li><a class="reference internal" href="#options-pathname-option"><code class="docutils literal notranslate"><span class="pre">--options=PATHNAME</span></code> option</a><ul> +<li><a class="reference internal" href="#specifying-a-directory">Specifying a directory</a></li> +<li><a class="reference internal" href="#specifying-an-optlib-path-list">Specifying an optlib PATH list</a></li> +</ul> +</li> +<li><a class="reference internal" href="#tips-for-writing-an-option-file">Tips for writing an option file</a></li> +<li><a class="reference internal" href="#difference-from-exuberant-ctags">Difference from Exuberant Ctags</a><ul> +<li><a class="reference internal" href="#directory-oriented-configuration-management">Directory oriented configuration management</a></li> +<li><a class="reference internal" href="#avoiding-option-incompatibility-issues">Avoiding option incompatibility issues</a></li> +<li><a class="reference internal" href="#no-system-wide-configuration">No system wide configuration</a></li> +<li><a class="reference internal" href="#using-ctags-for-the-file-extension">Using <code class="file docutils literal notranslate"><span class="pre">.ctags</span></code> for the file extension</a></li> +</ul> +</li> +</ul> +</li> +</ul> + + <h4>Previous topic</h4> + <p class="topless"><a href="parser-xslt.html" + title="previous chapter">XSLT parser</a></p> + <h4>Next topic</h4> + <p class="topless"><a href="output-format.html" + title="next chapter">Output formats</a></p> +<div id="searchbox" style="display: none" role="search"> + <h3 id="searchlabel">Quick search</h3> + <div class="searchformwrapper"> + <form class="search" action="search.html" method="get"> + <input type="text" name="q" aria-labelledby="searchlabel" /> + <input type="submit" value="Go" /> + </form> + </div> +</div> +<script>$('#searchbox').show(0);</script> + </div> + </div> + <div class="clearer"></div> + </div> + <div class="related" role="navigation" aria-label="related navigation"> + <h3>Navigation</h3> + <ul> + <li class="right" style="margin-right: 10px"> + <a href="genindex.html" title="General Index" + >index</a></li> + <li class="right" > + <a href="output-format.html" title="Output formats" + >next</a> |</li> + <li class="right" > + <a href="parser-xslt.html" title="XSLT parser" + >previous</a> |</li> + <li class="nav-item nav-item-0"><a href="index.html">Universal Ctags 0.3.0 documentation</a> »</li> + <li class="nav-item nav-item-this"><a href="">Option files</a></li> + </ul> + </div> + <div class="footer" role="contentinfo"> + © Copyright 2015, Universal Ctags Team. + Last updated on 11 Jun 2021. + Created using <a href="https://www.sphinx-doc.org/">Sphinx</a> 4.0.2. + </div> + </body> +</html>
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