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<h1 id="crystal">Crystal</h1>
<h2 id="building-a-crystal-package">Building a Crystal package</h2>
<p>This section uses <a href="https://github.com/mint-lang/mint">Mint</a> as an example for how to build a Crystal package.</p>
<p>If the Crystal project has any dependencies, the first step is to get a <code>shards.nix</code> file encoding those. Get a copy of the project and go to its root directory such that its <code>shard.lock</code> file is in the current directory. Executable projects should usually commit the <code>shard.lock</code> file, but sometimes that's not the case, which means you need to generate it yourself. With an existing <code>shard.lock</code> file, <code>crystal2nix</code> can be run.
<div class="highlight"><pre><span></span><code>$<span class="w"> </span>git<span class="w"> </span>clone<span class="w"> </span>https://github.com/mint-lang/mint
$<span class="w"> </span><span class="nb">cd</span><span class="w"> </span>mint
$<span class="w"> </span>git<span class="w"> </span>checkout<span class="w"> </span><span class="m">0</span>.5.0
$<span class="w"> </span><span class="k">if</span><span class="w"> </span><span class="o">[</span><span class="w"> </span>!<span class="w"> </span>-f<span class="w"> </span>shard.lock<span class="w"> </span><span class="o">]</span><span class="p">;</span><span class="w"> </span><span class="k">then</span><span class="w"> </span>nix-shell<span class="w"> </span>-p<span class="w"> </span>shards<span class="w"> </span>--run<span class="w"> </span><span class="s2">&quot;shards lock&quot;</span><span class="p">;</span><span class="w"> </span><span class="k">fi</span>
$<span class="w"> </span>nix-shell<span class="w"> </span>-p<span class="w"> </span>crystal2nix<span class="w"> </span>--run<span class="w"> </span>crystal2nix
</code></pre></div></p>
<p>This should have generated a <code>shards.nix</code> file.</p>
<p>Next create a Nix file for your derivation and use <code>pkgs.crystal.buildCrystalPackage</code> as follows:</p>
<div class="highlight"><pre><span></span><code><span class="k">with</span> <span class="nb">import</span> <span class="l">&lt;nixpkgs&gt;</span> <span class="p">{};</span>
crystal<span class="o">.</span>buildCrystalPackage <span class="k">rec</span> <span class="p">{</span>
<span class="ss">pname</span> <span class="o">=</span> <span class="s2">&quot;mint&quot;</span><span class="p">;</span>
<span class="ss">version</span> <span class="o">=</span> <span class="s2">&quot;0.5.0&quot;</span><span class="p">;</span>
<span class="ss">src</span> <span class="o">=</span> fetchFromGitHub <span class="p">{</span>
<span class="ss">owner</span> <span class="o">=</span> <span class="s2">&quot;mint-lang&quot;</span><span class="p">;</span>
<span class="ss">repo</span> <span class="o">=</span> <span class="s2">&quot;mint&quot;</span><span class="p">;</span>
<span class="ss">rev</span> <span class="o">=</span> version<span class="p">;</span>
<span class="ss">hash</span> <span class="o">=</span> <span class="s2">&quot;sha256-dFN9l5fgrM/TtOPqlQvUYgixE4KPr629aBmkwdDoq28=&quot;</span><span class="p">;</span>
<span class="p">};</span>
<span class="c1"># Insert the path to your shards.nix file here</span>
<span class="ss">shardsFile</span> <span class="o">=</span> <span class="l">./shards.nix</span><span class="p">;</span>
<span class="c1"># ...</span>
<span class="p">}</span>
</code></pre></div>
<p>This won't build anything yet, because we haven't told it what files build. We can specify a mapping from binary names to source files with the <code>crystalBinaries</code> attribute. The project's compilation instructions should show this. For Mint, the binary is called "mint", which is compiled from the source file <code>src/mint.cr</code>, so we'll specify this as follows:</p>
<div class="highlight"><pre><span></span><code><span class="p">{</span>
crystalBinaries<span class="o">.</span>mint<span class="o">.</span><span class="ss">src</span> <span class="o">=</span> <span class="s2">&quot;src/mint.cr&quot;</span><span class="p">;</span>
<span class="c1"># ...</span>
<span class="p">}</span>
</code></pre></div>
<p>Additionally you can override the default <code>crystal build</code> options (which are currently <code>--release --progress --no-debug --verbose</code>) with</p>
<div class="highlight"><pre><span></span><code><span class="p">{</span>
crystalBinaries<span class="o">.</span>mint<span class="o">.</span><span class="ss">options</span> <span class="o">=</span> <span class="p">[</span> <span class="s2">&quot;--release&quot;</span> <span class="s2">&quot;--verbose&quot;</span> <span class="p">];</span>
<span class="p">}</span>
</code></pre></div>
<p>Depending on the project, you might need additional steps to get it to compile successfully. In Mint's case, we need to link against openssl, so in the end the Nix file looks as follows:</p>
<div class="highlight"><pre><span></span><code><span class="k">with</span> <span class="nb">import</span> <span class="l">&lt;nixpkgs&gt;</span> <span class="p">{};</span>
crystal<span class="o">.</span>buildCrystalPackage <span class="k">rec</span> <span class="p">{</span>
<span class="ss">version</span> <span class="o">=</span> <span class="s2">&quot;0.5.0&quot;</span><span class="p">;</span>
<span class="ss">pname</span> <span class="o">=</span> <span class="s2">&quot;mint&quot;</span><span class="p">;</span>
<span class="ss">src</span> <span class="o">=</span> fetchFromGitHub <span class="p">{</span>
<span class="ss">owner</span> <span class="o">=</span> <span class="s2">&quot;mint-lang&quot;</span><span class="p">;</span>
<span class="ss">repo</span> <span class="o">=</span> <span class="s2">&quot;mint&quot;</span><span class="p">;</span>
<span class="ss">rev</span> <span class="o">=</span> version<span class="p">;</span>
<span class="ss">hash</span> <span class="o">=</span> <span class="s2">&quot;sha256-dFN9l5fgrM/TtOPqlQvUYgixE4KPr629aBmkwdDoq28=&quot;</span><span class="p">;</span>
<span class="p">};</span>
<span class="ss">shardsFile</span> <span class="o">=</span> <span class="l">./shards.nix</span><span class="p">;</span>
crystalBinaries<span class="o">.</span>mint<span class="o">.</span><span class="ss">src</span> <span class="o">=</span> <span class="s2">&quot;src/mint.cr&quot;</span><span class="p">;</span>
<span class="ss">buildInputs</span> <span class="o">=</span> <span class="p">[</span> openssl <span class="p">];</span>
<span class="p">}</span>
</code></pre></div>
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<div class="md-dialog__inner md-typeset"></div>
</div>
<script id="__config" type="application/json">{"base": "../../..", "features": ["content.tooltips", "search.highlight", "navigation.tabs", "navigation.indexes", "navigation.prune"], "search": "../../../assets/javascripts/workers/search.b8dbb3d2.min.js", "translations": {"clipboard.copied": "Copied to clipboard", "clipboard.copy": "Copy to clipboard", "search.result.more.one": "1 more on this page", "search.result.more.other": "# more on this page", "search.result.none": "No matching documents", "search.result.one": "1 matching document", "search.result.other": "# matching documents", "search.result.placeholder": "Type to start searching", "search.result.term.missing": "Missing", "select.version": "Select version"}}</script>
<script src="../../../assets/javascripts/bundle.fe8b6f2b.min.js"></script>
</body>
</html>
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