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<h1>Fandango File Locations</h1>
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<li class="toc-h2 nav-item toc-entry"><a class="reference internal nav-link" href="#where-does-fandango-look-for-included-specs">Where Does Fandango Look for Included Specs?</a></li>
<li class="toc-h2 nav-item toc-entry"><a class="reference internal nav-link" href="#where-does-fandango-store-parsed-files">Where Does Fandango Store Parsed Files?</a></li>
<li class="toc-h2 nav-item toc-entry"><a class="reference internal nav-link" href="#where-is-fandango-installed">Where is Fandango installed?</a></li>
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<section class="tex2jax_ignore mathjax_ignore" id="fandango-file-locations">
<span id="sec-file-locations"></span><h1>Fandango File Locations<a class="headerlink" href="#fandango-file-locations" title="Link to this heading">#</a></h1>
<section id="where-does-fandango-look-for-included-specs">
<span id="sec-including"></span><h2>Where Does Fandango Look for Included Specs?<a class="headerlink" href="#where-does-fandango-look-for-included-specs" title="Link to this heading">#</a></h2>
<p>In a Fandango spec, <a class="reference internal" href="Hatching.html#sec-hatching"><span class="std std-ref">the <code class="docutils literal notranslate"><span class="pre">include()</span></code> function</span></a> searches for Fandango files in a number of locations.
The actual rules for where Fandango searches are complex, versatile, and adhere to common standards.
Specifically, when including a <code class="docutils literal notranslate"><span class="pre">.fan</span></code> file using <code class="docutils literal notranslate"><span class="pre">include()</span></code>, Fandango searches for <code class="docutils literal notranslate"><span class="pre">.fan</span></code> files in the following locations, in this order:</p>
<ol class="arabic simple">
<li><p>In any directory <code class="docutils literal notranslate"><span class="pre">DIR</span></code> explicitly specified by <code class="docutils literal notranslate"><span class="pre">-I</span> <span class="pre">DIR</span></code> or <code class="docutils literal notranslate"><span class="pre">--include-dir</span> <span class="pre">DIR</span></code>.</p></li>
<li><p>In any directory specified by the <code class="docutils literal notranslate"><span class="pre">$FANDANGO_PATH</span></code> environment variable, if set. This variable is a colon-separated list of directories, e.g. <code class="docutils literal notranslate"><span class="pre">$HOME/my_cool_fan_specs:/Volumes/Fandango:/opt/local/fandango-1.27</span></code> which are searched from left to right.</p></li>
<li><p>In the directory of the <em>including file</em>. This is the most common usage. If the including file has no file name (say, because it is a stream), the current directory is used.</p></li>
<li><p>In the directory <code class="docutils literal notranslate"><span class="pre">$HOME/.local/share/fandango</span></code>. You can control this location by setting the
<code class="docutils literal notranslate"><span class="pre">$XDG_DATA_HOME</span></code> environment variable; see the <a class="reference external" href="https://specifications.freedesktop.org/basedir-spec/latest/">XDG Base Directory Specification</a>. On a Mac, the location <code class="docutils literal notranslate"><span class="pre">$HOME/Library/Fandango</span></code> is searched first.</p></li>
<li><p>In one of the system directories <code class="docutils literal notranslate"><span class="pre">/usr/local/share/fandango</span></code> or <code class="docutils literal notranslate"><span class="pre">/usr/share/fandango</span></code>. You can control these locations by setting the
<code class="docutils literal notranslate"><span class="pre">$XDG_DATA_DIRS</span></code> environment variable; see the <a class="reference external" href="https://specifications.freedesktop.org/basedir-spec/latest/">XDG Base Directory Specification</a>. On a Mac, the location <code class="docutils literal notranslate"><span class="pre">/Library/Fandango</span></code> is searched first.</p></li>
<li><p>If the file to be included cannot be found in any of these locations, a <code class="docutils literal notranslate"><span class="pre">FileNotFoundError</span></code> is raised.</p></li>
</ol>
<p>And then, there are two extra rules:</p>
<ul class="simple">
<li><p>If the included file has an <em>absolute</em> path (say, <code class="docutils literal notranslate"><span class="pre">/usr/local/specs/spec.fan</span></code>), only this absolute path will be used.</p></li>
<li><p>If the included file has a <em>relative</em> path (say, <code class="docutils literal notranslate"><span class="pre">../spec.fan</span></code>), then this relative path will be applied to the locations above. This is mostly useful when you have a path relative to the including file.</p></li>
</ul>
<div class="admonition tip">
<p class="admonition-title">Tip</p>
<p>We recommend to store included Fandango specs either</p>
<ul class="simple">
<li><p>in the directory where the <em>including</em> specs are, or</p></li>
<li><p>in <code class="docutils literal notranslate"><span class="pre">$HOME/.local/share/fandango</span></code> (or <code class="docutils literal notranslate"><span class="pre">$HOME/Library/Fandango</span></code> on a Mac).</p></li>
</ul>
</div>
<p>Finally, keep in mind that <code class="docutils literal notranslate"><span class="pre">include()</span></code> is a Python function, so in principle, your spec can compute the file name and location in any way you like.
The simplest solution, however, is to use one of the “standard” locations as listed above.</p>
</section>
<section id="where-does-fandango-store-parsed-files">
<span id="sec-caching"></span><h2>Where Does Fandango Store Parsed Files?<a class="headerlink" href="#where-does-fandango-store-parsed-files" title="Link to this heading">#</a></h2>
<p>Fandango maintains a <em>cache</em> for parsed <code class="docutils literal notranslate"><span class="pre">.fan</span></code> files in order to retrieve them faster.</p>
<p>Use <code class="docutils literal notranslate"><span class="pre">fandango</span> <span class="pre">clear-cache</span> <span class="pre">-n</span></code> to retrieve its location:</p>
<div class="highlight-shell notranslate"><div class="highlight"><pre><span></span>$<span class="w"> </span>fandango<span class="w"> </span>clear-cache<span class="w"> </span>-n
</pre></div>
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<div class="output stream highlight-myst-ansi notranslate"><div class="highlight"><pre><span></span>Would clear /home/runner/.cache/fandango
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<p>If you want to reclaim space, or if there is some incompatibility between parsed and cached files, use <code class="docutils literal notranslate"><span class="pre">fandango</span> <span class="pre">clear-cache</span></code> to clear the cache:</p>
<div class="highlight-shell notranslate"><div class="highlight"><pre><span></span>$<span class="w"> </span>fandango<span class="w"> </span>clear-cache
</pre></div>
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<div class="output stream highlight-myst-ansi notranslate"><div class="highlight"><pre><span></span>Clearing /home/runner/.cache/fandango
</pre></div>
</div>
</div>
</div>
</section>
<section id="where-is-fandango-installed">
<span id="sec-fandango-location"></span><h2>Where is Fandango installed?<a class="headerlink" href="#where-is-fandango-installed" title="Link to this heading">#</a></h2>
<p>This depends on your Python installation.
You can query the location using</p>
<div class="highlight-shell notranslate"><div class="highlight"><pre><span></span>$<span class="w"> </span>pip<span class="w"> </span>show<span class="w"> </span>fandango-fuzzer<span class="w"> </span><span class="p">|</span><span class="w"> </span>grep<span class="w"> </span>Location
</pre></div>
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<div class="output stream highlight-myst-ansi notranslate"><div class="highlight"><pre><span></span><span class=" -Color -Color-Faint">Using Python 3.13.13 environment at: /home/runner/work/fandango/fandango/.venv</span>
Location: /home/runner/work/fandango/fandango/.venv/lib/python3.13/site-packages
</pre></div>
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<li class="toc-h2 nav-item toc-entry"><a class="reference internal nav-link" href="#where-does-fandango-look-for-included-specs">Where Does Fandango Look for Included Specs?</a></li>
<li class="toc-h2 nav-item toc-entry"><a class="reference internal nav-link" href="#where-does-fandango-store-parsed-files">Where Does Fandango Store Parsed Files?</a></li>
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