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<h1 id="sec-pkgs-nix-gitignore">pkgs.nix-gitignore</h1>
<p><code>pkgs.nix-gitignore</code> is a function that acts similarly to <code>builtins.filterSource</code> but also allows filtering with the help of the gitignore format.</p>
<h2 id="sec-pkgs-nix-gitignore-usage">Usage</h2>
<p><code>pkgs.nix-gitignore</code> exports a number of functions, but you'll most likely need either <code>gitignoreSource</code> or <code>gitignoreSourcePure</code>. As their first argument, they both accept either 1. a file with gitignore lines or 2. a string with gitignore lines, or 3. a list of either of the two. They will be concatenated into a single big string.</p>
<div class="highlight"><pre><span></span><code><span class="p">{</span> pkgs <span class="o">?</span> <span class="nb">import</span> <span class="l">&lt;nixpkgs&gt;</span> <span class="p">{}</span> <span class="p">}:</span> <span class="p">{</span>
<span class="ss">src</span> <span class="o">=</span> nix-gitignore<span class="o">.</span>gitignoreSource <span class="p">[]</span> <span class="l">./source</span><span class="p">;</span>
<span class="c1"># Simplest version</span>
<span class="ss">src</span> <span class="o">=</span> nix-gitignore<span class="o">.</span>gitignoreSource <span class="s2">&quot;supplemental-ignores</span><span class="se">\n</span><span class="s2">&quot;</span> <span class="l">./source</span><span class="p">;</span>
<span class="c1"># This one reads the ./source/.gitignore and concats the auxiliary ignores</span>
<span class="ss">src</span> <span class="o">=</span> nix-gitignore<span class="o">.</span>gitignoreSourcePure <span class="s2">&quot;ignore-this</span><span class="se">\n</span><span class="s2">ignore-that</span><span class="se">\n</span><span class="s2">&quot;</span> <span class="l">./source</span><span class="p">;</span>
<span class="c1"># Use this string as gitignore, don&#39;t read ./source/.gitignore.</span>
<span class="ss">src</span> <span class="o">=</span> nix-gitignore<span class="o">.</span>gitignoreSourcePure <span class="p">[</span><span class="s2">&quot;ignore-this</span><span class="se">\n</span><span class="s2">ignore-that</span><span class="se">\n</span><span class="s2">&quot;</span> <span class="l">~/.gitignore</span><span class="p">]</span> <span class="l">./source</span><span class="p">;</span>
<span class="c1"># It also accepts a list (of strings and paths) that will be concatenated</span>
<span class="c1"># once the paths are turned to strings via readFile.</span>
<span class="p">}</span>
</code></pre></div>
<p>These functions are derived from the <code>Filter</code> functions by setting the first filter argument to <code>(_: _: true)</code>:</p>
<div class="highlight"><pre><span></span><code><span class="p">{</span>
<span class="ss">gitignoreSourcePure</span> <span class="o">=</span> gitignoreFilterSourcePure <span class="p">(</span>_<span class="p">:</span> _<span class="p">:</span> <span class="no">true</span><span class="p">);</span>
<span class="ss">gitignoreSource</span> <span class="o">=</span> gitignoreFilterSource <span class="p">(</span>_<span class="p">:</span> _<span class="p">:</span> <span class="no">true</span><span class="p">);</span>
<span class="p">}</span>
</code></pre></div>
<p>Those filter functions accept the same arguments the <code>builtins.filterSource</code> function would pass to its filters, thus <code>fn: gitignoreFilterSourcePure fn ""</code> should be extensionally equivalent to <code>filterSource</code>. The file is blacklisted if it's blacklisted by either your filter or the gitignoreFilter.</p>
<p>If you want to make your own filter from scratch, you may use</p>
<div class="highlight"><pre><span></span><code><span class="p">{</span>
<span class="ss">gitignoreFilter</span> <span class="o">=</span> ign<span class="p">:</span> root<span class="p">:</span> filterPattern <span class="p">(</span>gitignoreToPatterns ign<span class="p">)</span> root<span class="p">;</span>
<span class="p">}</span>
</code></pre></div>
<h2 id="sec-pkgs-nix-gitignore-usage-recursive">gitignore files in subdirectories</h2>
<p>If you wish to use a filter that would search for .gitignore files in subdirectories, just like git does by default, use this function:</p>
<div class="highlight"><pre><span></span><code><span class="p">{</span>
<span class="c1"># gitignoreFilterRecursiveSource = filter: patterns: root:</span>
<span class="c1"># OR</span>
<span class="ss">gitignoreRecursiveSource</span> <span class="o">=</span> gitignoreFilterSourcePure <span class="p">(</span>_<span class="p">:</span> _<span class="p">:</span> <span class="no">true</span><span class="p">);</span>
<span class="p">}</span>
</code></pre></div>
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