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<h1 id="sec-chicken">CHICKEN</h1>
<p><a href="https://call-cc.org/">CHICKEN</a> is a
<a href="https://schemers.org/Documents/Standards/R5RS/HTML/">R⁵RS</a>-compliant Scheme
compiler. It includes an interactive mode and a custom package format, "eggs".</p>
<h2 id="sec-chicken-using">Using Eggs</h2>
<p>Eggs described in nixpkgs are available inside the
<code>chickenPackages.chickenEggs</code> attrset. Including an egg as a build input is
done in the typical Nix fashion. For example, to include support for <a href="https://srfi.schemers.org/srfi-189/srfi-189.html">SRFI
189</a> in a derivation, one
might write:</p>
<div class="highlight"><pre><span></span><code><span class="p">{</span>
<span class="ss">buildInputs</span> <span class="o">=</span> <span class="p">[</span>
chicken
chickenPackages<span class="o">.</span>chickenEggs<span class="o">.</span>srfi-189
<span class="p">];</span>
<span class="p">}</span>
</code></pre></div>
<p>Both <code>chicken</code> and its eggs have a setup hook which configures the environment
variables <code>CHICKEN_INCLUDE_PATH</code> and <code>CHICKEN_REPOSITORY_PATH</code>.</p>
<h2 id="sec-chicken-updating-eggs">Updating Eggs</h2>
<p>nixpkgs only knows about a subset of all published eggs. It uses
<a href="https://github.com/the-kenny/egg2nix">egg2nix</a> to generate a
package set from a list of eggs to include.</p>
<p>The package set is regenerated by running the following shell commands:</p>
<div class="highlight"><pre><span></span><code>$ nix-shell -p chickenPackages.egg2nix
$ cd pkgs/development/compilers/chicken/5/
$ egg2nix eggs.scm &gt; eggs.nix
</code></pre></div>
<h2 id="sec-chicken-adding-eggs">Adding Eggs</h2>
<p>When we run <code>egg2nix</code>, we obtain one collection of eggs with
mutually-compatible versions. This means that when we add new eggs, we may
need to update existing eggs. To keep those separate, follow the procedure for
updating eggs before including more eggs.</p>
<p>To include more eggs, edit <code>pkgs/development/compilers/chicken/5/eggs.scm</code>.
The first section of this file lists eggs which are required by <code>egg2nix</code>
itself; all other eggs go into the second section. After editing, follow the
procedure for updating eggs.</p>
<h2 id="sec-chicken-override-scope">Override Scope</h2>
<p>The chicken package and its eggs, respectively, reside in a scope. This means,
the scope can be overridden to effect other packages in it.</p>
<p>This example shows how to use a local copy of <code>srfi-180</code> and have it affect
all the other eggs:</p>
<div class="highlight"><pre><span></span><code><span class="k">let</span>
<span class="ss">myChickenPackages</span> <span class="o">=</span> pkgs<span class="o">.</span>chickenPackages<span class="o">.</span>overrideScope&#39; <span class="p">(</span>self<span class="p">:</span> super<span class="p">:</span> <span class="p">{</span>
<span class="c1"># The chicken package itself can be overridden to effect the whole ecosystem.</span>
<span class="c1"># chicken = super.chicken.overrideAttrs {</span>
<span class="c1"># src = ...</span>
<span class="c1"># };</span>
<span class="ss">chickenEggs</span> <span class="o">=</span> super<span class="o">.</span>chickenEggs<span class="o">.</span>overrideScope&#39; <span class="p">(</span>eggself<span class="p">:</span> eggsuper<span class="p">:</span> <span class="p">{</span>
<span class="ss">srfi-180</span> <span class="o">=</span> eggsuper<span class="o">.</span>srfi-180<span class="o">.</span>overrideAttrs <span class="p">{</span>
<span class="c1"># path to a local copy of srfi-180</span>
<span class="ss">src</span> <span class="o">=</span> <span class="l">&lt;...&gt;</span><span class="p">;</span>
<span class="p">};</span>
<span class="p">});</span>
<span class="p">});</span>
<span class="k">in</span>
<span class="c1"># Here, `myChickenPackages.chickenEggs.json-rpc`, which depends on `srfi-180` will use</span>
<span class="c1"># the local copy of `srfi-180`.</span>
<span class="l">&lt;...&gt;</span>
</code></pre></div>
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