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<h1 id="sec-functions-library-attrsets">lib.attrsets: attribute set functions</h1>
<p>Operations on attribute sets.</p>
<h2 id="function-library-lib.attrsets.attrByPath"><code>lib.attrsets.attrByPath</code></h2>
<p>Return an attribute from nested attribute sets.</p>
<p>Nix has an <a href="https://nixos.org/manual/nix/stable/language/operators#attribute-selection">attribute selection operator <code>. or</code></a> which is sufficient for such queries, as long as the number of attributes is static. For example:</p>
<div class="highlight"><pre><span></span><code><span class="p">(</span>x<span class="o">.</span>a<span class="o">.</span>b <span class="ow">or</span> <span class="mi">6</span><span class="p">)</span> <span class="o">==</span> attrByPath <span class="p">[</span><span class="s2">&quot;a&quot;</span> <span class="s2">&quot;b&quot;</span><span class="p">]</span> <span class="mi">6</span> x
<span class="c1"># and</span>
<span class="p">(</span>x<span class="o">.</span><span class="si">${</span>f p<span class="si">}</span><span class="o">.</span><span class="s2">&quot;example.com&quot;</span> <span class="ow">or</span> <span class="mi">6</span><span class="p">)</span> <span class="o">==</span> attrByPath <span class="p">[</span> <span class="p">(</span>f p<span class="p">)</span> <span class="s2">&quot;example.com&quot;</span> <span class="p">]</span> <span class="mi">6</span> x
</code></pre></div>
<h3 id="inputs">Inputs</h3>
<p><code>attrPath</code></p>
<p>: A list of strings representing the attribute path to return from <code>set</code></p>
<p><code>default</code></p>
<p>: Default value if <code>attrPath</code> does not resolve to an existing value</p>
<p><code>set</code></p>
<p>: The nested attribute set to select values from</p>
<h3 id="type">Type</h3>
<div class="highlight"><pre><span></span><code>attrByPath :: [String] -&gt; Any -&gt; AttrSet -&gt; Any
</code></pre></div>
<h3 id="examples">Examples</h3>
<div class="admonition example">
<p class="admonition-title"><code>lib.attrsets.attrByPath</code> usage example</p>
<div class="highlight"><pre><span></span><code><span class="ss">x</span> <span class="o">=</span> <span class="p">{</span> <span class="ss">a</span> <span class="o">=</span> <span class="p">{</span> <span class="ss">b</span> <span class="o">=</span> <span class="mi">3</span><span class="p">;</span> <span class="p">};</span> <span class="p">}</span>
<span class="c1"># [&quot;a&quot; &quot;b&quot;] is equivalent to x.a.b</span>
<span class="c1"># 6 is a default value to return if the path does not exist in attrset</span>
attrByPath <span class="p">[</span><span class="s2">&quot;a&quot;</span> <span class="s2">&quot;b&quot;</span><span class="p">]</span> <span class="mi">6</span> <span class="ss">x</span>
<span class="o">=&gt;</span> <span class="mi">3</span>
attrByPath <span class="p">[</span><span class="s2">&quot;z&quot;</span> <span class="s2">&quot;z&quot;</span><span class="p">]</span> <span class="mi">6</span> <span class="ss">x</span>
<span class="o">=&gt;</span> <span class="mi">6</span>
</code></pre></div>
</div>
<p>Located at <a href="https://github.com/NixOS/nixpkgs/blob/master/lib/attrsets.nix#L65">lib/attrsets.nix:65</a> in <code>&lt;nixpkgs&gt;</code>.</p>
<h2 id="function-library-lib.attrsets.hasAttrByPath"><code>lib.attrsets.hasAttrByPath</code></h2>
<p>Return if an attribute from nested attribute set exists.</p>
<p>Nix has a <a href="https://nixos.org/manual/nix/stable/language/operators#has-attribute">has attribute operator <code>?</code></a>, which is sufficient for such queries, as long as the number of attributes is static. For example:</p>
<div class="highlight"><pre><span></span><code><span class="p">(</span>x<span class="o">?</span>a<span class="o">.</span>b<span class="p">)</span> <span class="o">==</span> hasAttrByPath <span class="p">[</span><span class="s2">&quot;a&quot;</span> <span class="s2">&quot;b&quot;</span><span class="p">]</span> x
<span class="c1"># and</span>
<span class="p">(</span>x<span class="o">?</span><span class="si">${</span>f p<span class="si">}</span><span class="o">.</span><span class="s2">&quot;example.com&quot;</span><span class="p">)</span> <span class="o">==</span> hasAttrByPath <span class="p">[</span> <span class="p">(</span>f p<span class="p">)</span> <span class="s2">&quot;example.com&quot;</span> <span class="p">]</span> x
</code></pre></div>
<p><strong>Laws</strong>:
1. <code>nix
hasAttrByPath [] x == true</code></p>
<h3 id="inputs_1">Inputs</h3>
<p><code>attrPath</code></p>
<p>: A list of strings representing the attribute path to check from <code>set</code></p>
<p><code>e</code></p>
<p>: The nested attribute set to check</p>
<h3 id="type_1">Type</h3>
<div class="highlight"><pre><span></span><code>hasAttrByPath :: [String] -&gt; AttrSet -&gt; Bool
</code></pre></div>
<h3 id="examples_1">Examples</h3>
<div class="admonition example">
<p class="admonition-title"><code>lib.attrsets.hasAttrByPath</code> usage example</p>
<div class="highlight"><pre><span></span><code><span class="ss">x</span> <span class="o">=</span> <span class="p">{</span> <span class="ss">a</span> <span class="o">=</span> <span class="p">{</span> <span class="ss">b</span> <span class="o">=</span> <span class="mi">3</span><span class="p">;</span> <span class="p">};</span> <span class="p">}</span>
hasAttrByPath <span class="p">[</span><span class="s2">&quot;a&quot;</span> <span class="s2">&quot;b&quot;</span><span class="p">]</span> <span class="ss">x</span>
<span class="o">=&gt;</span> <span class="no">true</span>
hasAttrByPath <span class="p">[</span><span class="s2">&quot;z&quot;</span> <span class="s2">&quot;z&quot;</span><span class="p">]</span> <span class="ss">x</span>
<span class="o">=&gt;</span> <span class="no">false</span>
hasAttrByPath <span class="p">[]</span> <span class="p">(</span><span class="nb">throw</span> <span class="s2">&quot;no need&quot;</span><span class="p">)</span>
<span class="o">=&gt;</span> <span class="no">true</span>
</code></pre></div>
</div>
<p>Located at <a href="https://github.com/NixOS/nixpkgs/blob/master/lib/attrsets.nix#L133">lib/attrsets.nix:133</a> in <code>&lt;nixpkgs&gt;</code>.</p>
<h2 id="function-library-lib.attrsets.longestValidPathPrefix"><code>lib.attrsets.longestValidPathPrefix</code></h2>
<p>Return the longest prefix of an attribute path that refers to an existing attribute in a nesting of attribute sets.</p>
<p>Can be used after <a href="#function-library-lib.attrsets.mapAttrsRecursiveCond"><code>mapAttrsRecursiveCond</code></a> to apply a condition,
although this will evaluate the predicate function on sibling attributes as well.</p>
<p>Note that the empty attribute path is valid for all values, so this function only throws an exception if any of its inputs does.</p>
<p><strong>Laws</strong>:
1. <code>nix
attrsets.longestValidPathPrefix [] x == []</code></p>
<ol>
<li><code>nix
hasAttrByPath (attrsets.longestValidPathPrefix p x) x == true</code></li>
</ol>
<h3 id="inputs_2">Inputs</h3>
<p><code>attrPath</code></p>
<p>: A list of strings representing the longest possible path that may be returned.</p>
<p><code>v</code></p>
<p>: The nested attribute set to check.</p>
<h3 id="type_2">Type</h3>
<div class="highlight"><pre><span></span><code>attrsets.longestValidPathPrefix :: [String] -&gt; Value -&gt; [String]
</code></pre></div>
<h3 id="examples_2">Examples</h3>
<div class="admonition example">
<p class="admonition-title"><code>lib.attrsets.longestValidPathPrefix</code> usage example</p>
<div class="highlight"><pre><span></span><code><span class="ss">x</span> <span class="o">=</span> <span class="p">{</span> <span class="ss">a</span> <span class="o">=</span> <span class="p">{</span> <span class="ss">b</span> <span class="o">=</span> <span class="mi">3</span><span class="p">;</span> <span class="p">};</span> <span class="p">}</span>
attrsets<span class="o">.</span>longestValidPathPrefix <span class="p">[</span><span class="s2">&quot;a&quot;</span> <span class="s2">&quot;b&quot;</span> <span class="s2">&quot;c&quot;</span><span class="p">]</span> <span class="ss">x</span>
<span class="o">=&gt;</span> <span class="p">[</span><span class="s2">&quot;a&quot;</span> <span class="s2">&quot;b&quot;</span><span class="p">]</span>
attrsets<span class="o">.</span>longestValidPathPrefix <span class="p">[</span><span class="s2">&quot;a&quot;</span><span class="p">]</span> <span class="ss">x</span>
<span class="o">=&gt;</span> <span class="p">[</span><span class="s2">&quot;a&quot;</span><span class="p">]</span>
attrsets<span class="o">.</span>longestValidPathPrefix <span class="p">[</span><span class="s2">&quot;z&quot;</span> <span class="s2">&quot;z&quot;</span><span class="p">]</span> <span class="ss">x</span>
<span class="o">=&gt;</span> <span class="p">[]</span>
attrsets<span class="o">.</span>longestValidPathPrefix <span class="p">[</span><span class="s2">&quot;z&quot;</span> <span class="s2">&quot;z&quot;</span><span class="p">]</span> <span class="p">(</span><span class="nb">throw</span> <span class="s2">&quot;no need&quot;</span><span class="p">)</span>
<span class="o">=&gt;</span> <span class="p">[]</span>
</code></pre></div>
</div>
<p>Located at <a href="https://github.com/NixOS/nixpkgs/blob/master/lib/attrsets.nix#L202">lib/attrsets.nix:202</a> in <code>&lt;nixpkgs&gt;</code>.</p>
<h2 id="function-library-lib.attrsets.setAttrByPath"><code>lib.attrsets.setAttrByPath</code></h2>
<p>Create a new attribute set with <code>value</code> set at the nested attribute location specified in <code>attrPath</code>.</p>
<h3 id="inputs_3">Inputs</h3>
<p><code>attrPath</code></p>
<p>: A list of strings representing the attribute path to set</p>
<p><code>value</code></p>
<p>: The value to set at the location described by <code>attrPath</code></p>
<h3 id="type_3">Type</h3>
<div class="highlight"><pre><span></span><code>setAttrByPath :: [String] -&gt; Any -&gt; AttrSet
</code></pre></div>
<h3 id="examples_3">Examples</h3>
<div class="admonition example">
<p class="admonition-title"><code>lib.attrsets.setAttrByPath</code> usage example</p>
<div class="highlight"><pre><span></span><code>setAttrByPath <span class="p">[</span><span class="s2">&quot;a&quot;</span> <span class="s2">&quot;b&quot;</span><span class="p">]</span> <span class="mi">3</span>
<span class="o">=&gt;</span> <span class="p">{</span> <span class="ss">a</span> <span class="o">=</span> <span class="p">{</span> <span class="ss">b</span> <span class="o">=</span> <span class="mi">3</span><span class="p">;</span> <span class="p">};</span> <span class="p">}</span>
</code></pre></div>
</div>
<p>Located at <a href="https://github.com/NixOS/nixpkgs/blob/master/lib/attrsets.nix#L265">lib/attrsets.nix:265</a> in <code>&lt;nixpkgs&gt;</code>.</p>
<h2 id="function-library-lib.attrsets.getAttrFromPath"><code>lib.attrsets.getAttrFromPath</code></h2>
<p>Like <code>attrByPath</code>, but without a default value. If it doesn't find the
path it will throw an error.</p>
<p>Nix has an <a href="https://nixos.org/manual/nix/stable/language/operators#attribute-selection">attribute selection operator</a> which is sufficient for such queries, as long as the number of attributes is static. For example:</p>
<div class="highlight"><pre><span></span><code>x<span class="o">.</span>a<span class="o">.</span><span class="ss">b</span> <span class="o">==</span> getAttrByPath <span class="p">[</span><span class="s2">&quot;a&quot;</span> <span class="s2">&quot;b&quot;</span><span class="p">]</span> x
<span class="c1"># and</span>
x<span class="o">.</span><span class="si">${</span>f p<span class="si">}</span><span class="o">.</span><span class="s2">&quot;example.com&quot;</span> <span class="o">==</span> getAttrByPath <span class="p">[</span> <span class="p">(</span>f p<span class="p">)</span> <span class="s2">&quot;example.com&quot;</span> <span class="p">]</span> x
</code></pre></div>
<h3 id="inputs_4">Inputs</h3>
<p><code>attrPath</code></p>
<p>: A list of strings representing the attribute path to get from <code>set</code></p>
<p><code>set</code></p>
<p>: The nested attribute set to find the value in.</p>
<h3 id="type_4">Type</h3>
<div class="highlight"><pre><span></span><code>getAttrFromPath :: [String] -&gt; AttrSet -&gt; Any
</code></pre></div>
<h3 id="examples_4">Examples</h3>
<div class="admonition example">
<p class="admonition-title"><code>lib.attrsets.getAttrFromPath</code> usage example</p>
<div class="highlight"><pre><span></span><code><span class="ss">x</span> <span class="o">=</span> <span class="p">{</span> <span class="ss">a</span> <span class="o">=</span> <span class="p">{</span> <span class="ss">b</span> <span class="o">=</span> <span class="mi">3</span><span class="p">;</span> <span class="p">};</span> <span class="p">}</span>
getAttrFromPath <span class="p">[</span><span class="s2">&quot;a&quot;</span> <span class="s2">&quot;b&quot;</span><span class="p">]</span> <span class="ss">x</span>
<span class="o">=&gt;</span> <span class="mi">3</span>
getAttrFromPath <span class="p">[</span><span class="s2">&quot;z&quot;</span> <span class="s2">&quot;z&quot;</span><span class="p">]</span> <span class="ss">x</span>
<span class="o">=&gt;</span> error<span class="p">:</span> cannot find attribute <span class="err">`</span>z<span class="o">.</span>z&#39;
</code></pre></div>
</div>
<p>Located at <a href="https://github.com/NixOS/nixpkgs/blob/master/lib/attrsets.nix#L319">lib/attrsets.nix:319</a> in <code>&lt;nixpkgs&gt;</code>.</p>
<h2 id="function-library-lib.attrsets.concatMapAttrs"><code>lib.attrsets.concatMapAttrs</code></h2>
<p>Map each attribute in the given set and merge them into a new attribute set.</p>
<h3 id="inputs_5">Inputs</h3>
<p><code>f</code></p>
<p>: 1. Function argument</p>
<p><code>v</code></p>
<p>: 2. Function argument</p>
<h3 id="type_5">Type</h3>
<div class="highlight"><pre><span></span><code>concatMapAttrs :: (String -&gt; a -&gt; AttrSet) -&gt; AttrSet -&gt; AttrSet
</code></pre></div>
<h3 id="examples_5">Examples</h3>
<div class="admonition example">
<p class="admonition-title"><code>lib.attrsets.concatMapAttrs</code> usage example</p>
<div class="highlight"><pre><span></span><code>concatMapAttrs
<span class="p">(</span>name<span class="p">:</span> value<span class="p">:</span> <span class="p">{</span>
<span class="si">${</span>name<span class="si">}</span> <span class="o">=</span> value<span class="p">;</span>
<span class="si">${</span>name <span class="o">+</span> value<span class="si">}</span> <span class="o">=</span> value<span class="p">;</span>
<span class="p">})</span>
<span class="p">{</span> <span class="ss">x</span> <span class="o">=</span> <span class="s2">&quot;a&quot;</span><span class="p">;</span> <span class="ss">y</span> <span class="o">=</span> <span class="s2">&quot;b&quot;</span><span class="p">;</span> <span class="p">}</span>
<span class="o">=&gt;</span> <span class="p">{</span> <span class="ss">x</span> <span class="o">=</span> <span class="s2">&quot;a&quot;</span><span class="p">;</span> <span class="ss">xa</span> <span class="o">=</span> <span class="s2">&quot;a&quot;</span><span class="p">;</span> <span class="ss">y</span> <span class="o">=</span> <span class="s2">&quot;b&quot;</span><span class="p">;</span> <span class="ss">yb</span> <span class="o">=</span> <span class="s2">&quot;b&quot;</span><span class="p">;</span> <span class="p">}</span>
</code></pre></div>
</div>
<p>Located at <a href="https://github.com/NixOS/nixpkgs/blob/master/lib/attrsets.nix#L360">lib/attrsets.nix:360</a> in <code>&lt;nixpkgs&gt;</code>.</p>
<h2 id="function-library-lib.attrsets.updateManyAttrsByPath"><code>lib.attrsets.updateManyAttrsByPath</code></h2>
<p>Update or set specific paths of an attribute set.</p>
<p>Takes a list of updates to apply and an attribute set to apply them to,
and returns the attribute set with the updates applied. Updates are
represented as <code>{ path = ...; update = ...; }</code> values, where <code>path</code> is a
list of strings representing the attribute path that should be updated,
and <code>update</code> is a function that takes the old value at that attribute path
as an argument and returns the new
value it should be.</p>
<p>Properties:</p>
<ul>
<li>
<p>Updates to deeper attribute paths are applied before updates to more
shallow attribute paths</p>
</li>
<li>
<p>Multiple updates to the same attribute path are applied in the order
they appear in the update list</p>
</li>
<li>
<p>If any but the last <code>path</code> element leads into a value that is not an
attribute set, an error is thrown</p>
</li>
<li>
<p>If there is an update for an attribute path that doesn't exist,
accessing the argument in the update function causes an error, but
intermediate attribute sets are implicitly created as needed</p>
</li>
</ul>
<h3 id="type_6">Type</h3>
<div class="highlight"><pre><span></span><code>updateManyAttrsByPath :: [{ path :: [String]; update :: (Any -&gt; Any); }] -&gt; AttrSet -&gt; AttrSet
</code></pre></div>
<h3 id="examples_6">Examples</h3>
<div class="admonition example">
<p class="admonition-title"><code>lib.attrsets.updateManyAttrsByPath</code> usage example</p>
<div class="highlight"><pre><span></span><code>updateManyAttrsByPath <span class="p">[</span>
<span class="p">{</span>
<span class="ss">path</span> <span class="o">=</span> <span class="p">[</span> <span class="s2">&quot;a&quot;</span> <span class="s2">&quot;b&quot;</span> <span class="p">];</span>
<span class="ss">update</span> <span class="o">=</span> old<span class="p">:</span> <span class="p">{</span> <span class="ss">d</span> <span class="o">=</span> old<span class="o">.</span>c<span class="p">;</span> <span class="p">};</span>
<span class="p">}</span>
<span class="p">{</span>
<span class="ss">path</span> <span class="o">=</span> <span class="p">[</span> <span class="s2">&quot;a&quot;</span> <span class="s2">&quot;b&quot;</span> <span class="s2">&quot;c&quot;</span> <span class="p">];</span>
<span class="ss">update</span> <span class="o">=</span> old<span class="p">:</span> old <span class="o">+</span> <span class="mi">1</span><span class="p">;</span>
<span class="p">}</span>
<span class="p">{</span>
<span class="ss">path</span> <span class="o">=</span> <span class="p">[</span> <span class="s2">&quot;x&quot;</span> <span class="s2">&quot;y&quot;</span> <span class="p">];</span>
<span class="ss">update</span> <span class="o">=</span> old<span class="p">:</span> <span class="s2">&quot;xy&quot;</span><span class="p">;</span>
<span class="p">}</span>
<span class="p">]</span> <span class="p">{</span> a<span class="o">.</span>b<span class="o">.</span><span class="ss">c</span> <span class="o">=</span> <span class="mi">0</span><span class="p">;</span> <span class="p">}</span>
<span class="o">=&gt;</span> <span class="p">{</span> <span class="ss">a</span> <span class="o">=</span> <span class="p">{</span> <span class="ss">b</span> <span class="o">=</span> <span class="p">{</span> <span class="ss">d</span> <span class="o">=</span> <span class="mi">1</span><span class="p">;</span> <span class="p">};</span> <span class="p">};</span> <span class="ss">x</span> <span class="o">=</span> <span class="p">{</span> <span class="ss">y</span> <span class="o">=</span> <span class="s2">&quot;xy&quot;</span><span class="p">;</span> <span class="p">};</span> <span class="p">}</span>
</code></pre></div>
</div>
<p>Located at <a href="https://github.com/NixOS/nixpkgs/blob/master/lib/attrsets.nix#L423">lib/attrsets.nix:423</a> in <code>&lt;nixpkgs&gt;</code>.</p>
<h2 id="function-library-lib.attrsets.attrVals"><code>lib.attrsets.attrVals</code></h2>
<p>Return the specified attributes from a set.</p>
<h3 id="inputs_6">Inputs</h3>
<p><code>nameList</code></p>
<p>: The list of attributes to fetch from <code>set</code>. Each attribute name must exist on the attrbitue set</p>
<p><code>set</code></p>
<p>: The set to get attribute values from</p>
<h3 id="type_7">Type</h3>
<div class="highlight"><pre><span></span><code>attrVals :: [String] -&gt; AttrSet -&gt; [Any]
</code></pre></div>
<h3 id="examples_7">Examples</h3>
<div class="admonition example">
<p class="admonition-title"><code>lib.attrsets.attrVals</code> usage example</p>
<div class="highlight"><pre><span></span><code>attrVals <span class="p">[</span><span class="s2">&quot;a&quot;</span> <span class="s2">&quot;b&quot;</span> <span class="s2">&quot;c&quot;</span><span class="p">]</span> <span class="ss">as</span>
<span class="o">=&gt;</span> <span class="p">[</span>as<span class="o">.</span>a as<span class="o">.</span>b as<span class="o">.</span>c<span class="p">]</span>
</code></pre></div>
</div>
<p>Located at <a href="https://github.com/NixOS/nixpkgs/blob/master/lib/attrsets.nix#L513">lib/attrsets.nix:513</a> in <code>&lt;nixpkgs&gt;</code>.</p>
<h2 id="function-library-lib.attrsets.attrValues"><code>lib.attrsets.attrValues</code></h2>
<p>Return the values of all attributes in the given set, sorted by
attribute name.</p>
<h3 id="type_8">Type</h3>
<div class="highlight"><pre><span></span><code>attrValues :: AttrSet -&gt; [Any]
</code></pre></div>
<h3 id="examples_8">Examples</h3>
<div class="admonition example">
<p class="admonition-title"><code>lib.attrsets.attrValues</code> usage example</p>
<div class="highlight"><pre><span></span><code>attrValues <span class="p">{</span><span class="ss">c</span> <span class="o">=</span> <span class="mi">3</span><span class="p">;</span> <span class="ss">a</span> <span class="o">=</span> <span class="mi">1</span><span class="p">;</span> <span class="ss">b</span> <span class="o">=</span> <span class="mi">2</span><span class="p">;}</span>
<span class="o">=&gt;</span> <span class="p">[</span><span class="mi">1</span> <span class="mi">2</span> <span class="mi">3</span><span class="p">]</span>
</code></pre></div>
</div>
<p>Located at <a href="https://github.com/NixOS/nixpkgs/blob/master/lib/attrsets.nix#L539">lib/attrsets.nix:539</a> in <code>&lt;nixpkgs&gt;</code>.</p>
<h2 id="function-library-lib.attrsets.getAttrs"><code>lib.attrsets.getAttrs</code></h2>
<p>Given a set of attribute names, return the set of the corresponding
attributes from the given set.</p>
<h3 id="inputs_7">Inputs</h3>
<p><code>names</code></p>
<p>: A list of attribute names to get out of <code>set</code></p>
<p><code>attrs</code></p>
<p>: The set to get the named attributes from</p>
<h3 id="type_9">Type</h3>
<div class="highlight"><pre><span></span><code>getAttrs :: [String] -&gt; AttrSet -&gt; AttrSet
</code></pre></div>
<h3 id="examples_9">Examples</h3>
<div class="admonition example">
<p class="admonition-title"><code>lib.attrsets.getAttrs</code> usage example</p>
<div class="highlight"><pre><span></span><code>getAttrs <span class="p">[</span> <span class="s2">&quot;a&quot;</span> <span class="s2">&quot;b&quot;</span> <span class="p">]</span> <span class="p">{</span> <span class="ss">a</span> <span class="o">=</span> <span class="mi">1</span><span class="p">;</span> <span class="ss">b</span> <span class="o">=</span> <span class="mi">2</span><span class="p">;</span> <span class="ss">c</span> <span class="o">=</span> <span class="mi">3</span><span class="p">;</span> <span class="p">}</span>
<span class="o">=&gt;</span> <span class="p">{</span> <span class="ss">a</span> <span class="o">=</span> <span class="mi">1</span><span class="p">;</span> <span class="ss">b</span> <span class="o">=</span> <span class="mi">2</span><span class="p">;</span> <span class="p">}</span>
</code></pre></div>
</div>
<p>Located at <a href="https://github.com/NixOS/nixpkgs/blob/master/lib/attrsets.nix#L574">lib/attrsets.nix:574</a> in <code>&lt;nixpkgs&gt;</code>.</p>
<h2 id="function-library-lib.attrsets.catAttrs"><code>lib.attrsets.catAttrs</code></h2>
<p>Collect each attribute named <code>attr</code> from a list of attribute
sets. Sets that don't contain the named attribute are ignored.</p>
<h3 id="inputs_8">Inputs</h3>
<p><code>attr</code></p>
<p>: The attribute name to get out of the sets.</p>
<p><code>list</code></p>
<p>: The list of attribute sets to go through</p>
<h3 id="type_10">Type</h3>
<div class="highlight"><pre><span></span><code>catAttrs :: String -&gt; [AttrSet] -&gt; [Any]
</code></pre></div>
<h3 id="examples_10">Examples</h3>
<div class="admonition example">
<p class="admonition-title"><code>lib.attrsets.catAttrs</code> usage example</p>
<div class="highlight"><pre><span></span><code>catAttrs <span class="s2">&quot;a&quot;</span> <span class="p">[{</span><span class="ss">a</span> <span class="o">=</span> <span class="mi">1</span><span class="p">;}</span> <span class="p">{</span><span class="ss">b</span> <span class="o">=</span> <span class="mi">0</span><span class="p">;}</span> <span class="p">{</span><span class="ss">a</span> <span class="o">=</span> <span class="mi">2</span><span class="p">;}]</span>
<span class="o">=&gt;</span> <span class="p">[</span><span class="mi">1</span> <span class="mi">2</span><span class="p">]</span>
</code></pre></div>
</div>
<p>Located at <a href="https://github.com/NixOS/nixpkgs/blob/master/lib/attrsets.nix#L609">lib/attrsets.nix:609</a> in <code>&lt;nixpkgs&gt;</code>.</p>
<h2 id="function-library-lib.attrsets.filterAttrs"><code>lib.attrsets.filterAttrs</code></h2>
<p>Filter an attribute set by removing all attributes for which the
given predicate return false.</p>
<h3 id="inputs_9">Inputs</h3>
<p><code>pred</code></p>
<p>: Predicate taking an attribute name and an attribute value, which returns <code>true</code> to include the attribute, or <code>false</code> to exclude the attribute.</p>
<p><code>set</code></p>
<p>: The attribute set to filter</p>
<h3 id="type_11">Type</h3>
<div class="highlight"><pre><span></span><code>filterAttrs :: (String -&gt; Any -&gt; Bool) -&gt; AttrSet -&gt; AttrSet
</code></pre></div>
<h3 id="examples_11">Examples</h3>
<div class="admonition example">
<p class="admonition-title"><code>lib.attrsets.filterAttrs</code> usage example</p>
<div class="highlight"><pre><span></span><code>filterAttrs <span class="p">(</span>n<span class="p">:</span> v<span class="p">:</span> <span class="ss">n</span> <span class="o">==</span> <span class="s2">&quot;foo&quot;</span><span class="p">)</span> <span class="p">{</span> <span class="ss">foo</span> <span class="o">=</span> <span class="mi">1</span><span class="p">;</span> <span class="ss">bar</span> <span class="o">=</span> <span class="mi">2</span><span class="p">;</span> <span class="p">}</span>
<span class="o">=&gt;</span> <span class="p">{</span> <span class="ss">foo</span> <span class="o">=</span> <span class="mi">1</span><span class="p">;</span> <span class="p">}</span>
</code></pre></div>
</div>
<p>Located at <a href="https://github.com/NixOS/nixpkgs/blob/master/lib/attrsets.nix#L644">lib/attrsets.nix:644</a> in <code>&lt;nixpkgs&gt;</code>.</p>
<h2 id="function-library-lib.attrsets.filterAttrsRecursive"><code>lib.attrsets.filterAttrsRecursive</code></h2>
<p>Filter an attribute set recursively by removing all attributes for
which the given predicate return false.</p>
<h3 id="inputs_10">Inputs</h3>
<p><code>pred</code></p>
<p>: Predicate taking an attribute name and an attribute value, which returns <code>true</code> to include the attribute, or <code>false</code> to exclude the attribute.</p>
<p><code>set</code></p>
<p>: The attribute set to filter</p>
<h3 id="type_12">Type</h3>
<div class="highlight"><pre><span></span><code>filterAttrsRecursive :: (String -&gt; Any -&gt; Bool) -&gt; AttrSet -&gt; AttrSet
</code></pre></div>
<h3 id="examples_12">Examples</h3>
<div class="admonition example">
<p class="admonition-title"><code>lib.attrsets.filterAttrsRecursive</code> usage example</p>
<div class="highlight"><pre><span></span><code>filterAttrsRecursive <span class="p">(</span>n<span class="p">:</span> v<span class="p">:</span> v <span class="o">!=</span> <span class="no">null</span><span class="p">)</span> <span class="p">{</span> <span class="ss">foo</span> <span class="o">=</span> <span class="p">{</span> <span class="ss">bar</span> <span class="o">=</span> <span class="no">null</span><span class="p">;</span> <span class="p">};</span> <span class="p">}</span>
<span class="o">=&gt;</span> <span class="p">{</span> <span class="ss">foo</span> <span class="o">=</span> <span class="p">{};</span> <span class="p">}</span>
</code></pre></div>
</div>
<p>Located at <a href="https://github.com/NixOS/nixpkgs/blob/master/lib/attrsets.nix#L682">lib/attrsets.nix:682</a> in <code>&lt;nixpkgs&gt;</code>.</p>
<h2 id="function-library-lib.attrsets.foldlAttrs"><code>lib.attrsets.foldlAttrs</code></h2>
<p>Like <a href="#function-library-lib.lists.foldl-prime"><code>lib.lists.foldl'</code></a> but for attribute sets.
Iterates over every name-value pair in the given attribute set.
The result of the callback function is often called <code>acc</code> for accumulator. It is passed between callbacks from left to right and the final <code>acc</code> is the return value of <code>foldlAttrs</code>.</p>
<p>Attention:</p>
<p>There is a completely different function <code>lib.foldAttrs</code>
which has nothing to do with this function, despite the similar name.</p>
<h3 id="inputs_11">Inputs</h3>
<p><code>f</code></p>
<p>: 1. Function argument</p>
<p><code>init</code></p>
<p>: 2. Function argument</p>
<p><code>set</code></p>
<p>: 3. Function argument</p>
<h3 id="type_13">Type</h3>
<div class="highlight"><pre><span></span><code>foldlAttrs :: ( a -&gt; String -&gt; b -&gt; a ) -&gt; a -&gt; { ... :: b } -&gt; a
</code></pre></div>
<h3 id="examples_13">Examples</h3>
<div class="admonition example">
<p class="admonition-title"><code>lib.attrsets.foldlAttrs</code> usage example</p>
<div class="highlight"><pre><span></span><code>foldlAttrs
<span class="p">(</span>acc<span class="p">:</span> name<span class="p">:</span> value<span class="p">:</span> <span class="p">{</span>
<span class="ss">sum</span> <span class="o">=</span> acc<span class="o">.</span>sum <span class="o">+</span> value<span class="p">;</span>
<span class="ss">names</span> <span class="o">=</span> acc<span class="o">.</span>names <span class="o">++</span> <span class="p">[</span>name<span class="p">];</span>
<span class="p">})</span>
<span class="p">{</span> <span class="ss">sum</span> <span class="o">=</span> <span class="mi">0</span><span class="p">;</span> <span class="ss">names</span> <span class="o">=</span> <span class="p">[];</span> <span class="p">}</span>
<span class="p">{</span>
<span class="ss">foo</span> <span class="o">=</span> <span class="mi">1</span><span class="p">;</span>
<span class="ss">bar</span> <span class="o">=</span> <span class="mi">10</span><span class="p">;</span>
<span class="p">}</span>
<span class="o">-&gt;</span>
<span class="p">{</span>
<span class="ss">sum</span> <span class="o">=</span> <span class="mi">11</span><span class="p">;</span>
<span class="ss">names</span> <span class="o">=</span> <span class="p">[</span><span class="s2">&quot;bar&quot;</span> <span class="s2">&quot;foo&quot;</span><span class="p">];</span>
<span class="p">}</span>
foldlAttrs
<span class="p">(</span><span class="nb">throw</span> <span class="s2">&quot;function not needed&quot;</span><span class="p">)</span>
<span class="mi">123</span>
<span class="p">{};</span>
<span class="o">-&gt;</span>
<span class="mi">123</span>
foldlAttrs
<span class="p">(</span>acc<span class="p">:</span> _<span class="p">:</span> _<span class="p">:</span> acc<span class="p">)</span>
<span class="mi">3</span>
<span class="p">{</span> <span class="ss">z</span> <span class="o">=</span> <span class="nb">throw</span> <span class="s2">&quot;value not needed&quot;</span><span class="p">;</span> <span class="ss">a</span> <span class="o">=</span> <span class="nb">throw</span> <span class="s2">&quot;value not needed&quot;</span><span class="p">;</span> <span class="p">};</span>
<span class="o">-&gt;</span>
<span class="mi">3</span>
The accumulator doesn&#39;t have to be an attrset<span class="o">.</span>
It can be as simple as a number <span class="ow">or</span> string<span class="o">.</span>
foldlAttrs
<span class="p">(</span>acc<span class="p">:</span> _<span class="p">:</span> v<span class="p">:</span> acc <span class="o">*</span> <span class="mi">10</span> <span class="o">+</span> v<span class="p">)</span>
<span class="mi">1</span>
<span class="p">{</span> <span class="ss">z</span> <span class="o">=</span> <span class="mi">1</span><span class="p">;</span> <span class="ss">a</span> <span class="o">=</span> <span class="mi">2</span><span class="p">;</span> <span class="p">};</span>
<span class="o">-&gt;</span>
<span class="mi">121</span>
</code></pre></div>
</div>
<p>Located at <a href="https://github.com/NixOS/nixpkgs/blob/master/lib/attrsets.nix#L776">lib/attrsets.nix:776</a> in <code>&lt;nixpkgs&gt;</code>.</p>
<h2 id="function-library-lib.attrsets.foldAttrs"><code>lib.attrsets.foldAttrs</code></h2>
<p>Apply fold functions to values grouped by key.</p>
<h3 id="inputs_12">Inputs</h3>
<p><code>op</code></p>
<p>: A function, given a value and a collector combines the two.</p>
<p><code>nul</code></p>
<p>: The starting value.</p>
<p><code>list_of_attrs</code></p>
<p>: A list of attribute sets to fold together by key.</p>
<h3 id="type_14">Type</h3>
<div class="highlight"><pre><span></span><code>foldAttrs :: (Any -&gt; Any -&gt; Any) -&gt; Any -&gt; [AttrSets] -&gt; Any
</code></pre></div>
<h3 id="examples_14">Examples</h3>
<div class="admonition example">
<p class="admonition-title"><code>lib.attrsets.foldAttrs</code> usage example</p>
<div class="highlight"><pre><span></span><code>foldAttrs <span class="p">(</span>item<span class="p">:</span> acc<span class="p">:</span> <span class="p">[</span>item<span class="p">]</span> <span class="o">++</span> acc<span class="p">)</span> <span class="p">[]</span> <span class="p">[{</span> <span class="ss">a</span> <span class="o">=</span> <span class="mi">2</span><span class="p">;</span> <span class="p">}</span> <span class="p">{</span> <span class="ss">a</span> <span class="o">=</span> <span class="mi">3</span><span class="p">;</span> <span class="p">}]</span>
<span class="o">=&gt;</span> <span class="p">{</span> <span class="ss">a</span> <span class="o">=</span> <span class="p">[</span> <span class="mi">2</span> <span class="mi">3</span> <span class="p">];</span> <span class="p">}</span>
</code></pre></div>
</div>
<p>Located at <a href="https://github.com/NixOS/nixpkgs/blob/master/lib/attrsets.nix#L817">lib/attrsets.nix:817</a> in <code>&lt;nixpkgs&gt;</code>.</p>
<h2 id="function-library-lib.attrsets.collect"><code>lib.attrsets.collect</code></h2>
<p>Recursively collect sets that verify a given predicate named <code>pred</code>
from the set <code>attrs</code>. The recursion is stopped when the predicate is
verified.</p>
<h3 id="inputs_13">Inputs</h3>
<p><code>pred</code></p>
<p>: Given an attribute's value, determine if recursion should stop.</p>
<p><code>attrs</code></p>
<p>: The attribute set to recursively collect.</p>
<h3 id="type_15">Type</h3>
<div class="highlight"><pre><span></span><code>collect :: (AttrSet -&gt; Bool) -&gt; AttrSet -&gt; [x]
</code></pre></div>
<h3 id="examples_15">Examples</h3>
<div class="admonition example">
<p class="admonition-title"><code>lib.attrsets.collect</code> usage example</p>
<div class="highlight"><pre><span></span><code>collect isList <span class="p">{</span> <span class="ss">a</span> <span class="o">=</span> <span class="p">{</span> <span class="ss">b</span> <span class="o">=</span> <span class="p">[</span><span class="s2">&quot;b&quot;</span><span class="p">];</span> <span class="p">};</span> <span class="ss">c</span> <span class="o">=</span> <span class="p">[</span><span class="mi">1</span><span class="p">];</span> <span class="p">}</span>
<span class="o">=&gt;</span> <span class="p">[[</span><span class="s2">&quot;b&quot;</span><span class="p">]</span> <span class="p">[</span><span class="mi">1</span><span class="p">]]</span>
collect <span class="p">(</span>x<span class="p">:</span> x <span class="o">?</span> outPath<span class="p">)</span>
<span class="p">{</span> <span class="ss">a</span> <span class="o">=</span> <span class="p">{</span> <span class="ss">outPath</span> <span class="o">=</span> <span class="s2">&quot;a/&quot;</span><span class="p">;</span> <span class="p">};</span> <span class="ss">b</span> <span class="o">=</span> <span class="p">{</span> <span class="ss">outPath</span> <span class="o">=</span> <span class="s2">&quot;b/&quot;</span><span class="p">;</span> <span class="p">};</span> <span class="p">}</span>
<span class="o">=&gt;</span> <span class="p">[{</span> <span class="ss">outPath</span> <span class="o">=</span> <span class="s2">&quot;a/&quot;</span><span class="p">;</span> <span class="p">}</span> <span class="p">{</span> <span class="ss">outPath</span> <span class="o">=</span> <span class="s2">&quot;b/&quot;</span><span class="p">;</span> <span class="p">}]</span>
</code></pre></div>
</div>
<p>Located at <a href="https://github.com/NixOS/nixpkgs/blob/master/lib/attrsets.nix#L865">lib/attrsets.nix:865</a> in <code>&lt;nixpkgs&gt;</code>.</p>
<h2 id="function-library-lib.attrsets.cartesianProduct"><code>lib.attrsets.cartesianProduct</code></h2>
<p>Return the cartesian product of attribute set value combinations.</p>
<h3 id="inputs_14">Inputs</h3>
<p><code>attrsOfLists</code></p>
<p>: Attribute set with attributes that are lists of values</p>
<h3 id="type_16">Type</h3>
<div class="highlight"><pre><span></span><code>cartesianProduct :: AttrSet -&gt; [AttrSet]
</code></pre></div>
<h3 id="examples_16">Examples</h3>
<div class="admonition example">
<p class="admonition-title"><code>lib.attrsets.cartesianProduct</code> usage example</p>
<div class="highlight"><pre><span></span><code>cartesianProduct <span class="p">{</span> <span class="ss">a</span> <span class="o">=</span> <span class="p">[</span> <span class="mi">1</span> <span class="mi">2</span> <span class="p">];</span> <span class="ss">b</span> <span class="o">=</span> <span class="p">[</span> <span class="mi">10</span> <span class="mi">20</span> <span class="p">];</span> <span class="p">}</span>
<span class="o">=&gt;</span> <span class="p">[</span>
<span class="p">{</span> <span class="ss">a</span> <span class="o">=</span> <span class="mi">1</span><span class="p">;</span> <span class="ss">b</span> <span class="o">=</span> <span class="mi">10</span><span class="p">;</span> <span class="p">}</span>
<span class="p">{</span> <span class="ss">a</span> <span class="o">=</span> <span class="mi">1</span><span class="p">;</span> <span class="ss">b</span> <span class="o">=</span> <span class="mi">20</span><span class="p">;</span> <span class="p">}</span>
<span class="p">{</span> <span class="ss">a</span> <span class="o">=</span> <span class="mi">2</span><span class="p">;</span> <span class="ss">b</span> <span class="o">=</span> <span class="mi">10</span><span class="p">;</span> <span class="p">}</span>
<span class="p">{</span> <span class="ss">a</span> <span class="o">=</span> <span class="mi">2</span><span class="p">;</span> <span class="ss">b</span> <span class="o">=</span> <span class="mi">20</span><span class="p">;</span> <span class="p">}</span>
<span class="p">]</span>
</code></pre></div>
</div>
<p>Located at <a href="https://github.com/NixOS/nixpkgs/blob/master/lib/attrsets.nix#L907">lib/attrsets.nix:907</a> in <code>&lt;nixpkgs&gt;</code>.</p>
<h2 id="function-library-lib.attrsets.mapCartesianProduct"><code>lib.attrsets.mapCartesianProduct</code></h2>
<p>Return the result of function f applied to the cartesian product of attribute set value combinations.
Equivalent to using cartesianProduct followed by map.</p>
<h3 id="inputs_15">Inputs</h3>
<p><code>f</code></p>
<p>: A function, given an attribute set, it returns a new value.</p>
<p><code>attrsOfLists</code></p>
<p>: Attribute set with attributes that are lists of values</p>
<h3 id="type_17">Type</h3>
<div class="highlight"><pre><span></span><code>mapCartesianProduct :: (AttrSet -&gt; a) -&gt; AttrSet -&gt; [a]
</code></pre></div>
<h3 id="examples_17">Examples</h3>
<div class="admonition example">
<p class="admonition-title"><code>lib.attrsets.mapCartesianProduct</code> usage example</p>
<div class="highlight"><pre><span></span><code>mapCartesianProduct <span class="p">({</span>a<span class="p">,</span> b<span class="p">}:</span> <span class="s2">&quot;</span><span class="si">${</span>a<span class="si">}</span><span class="s2">-</span><span class="si">${</span>b<span class="si">}</span><span class="s2">&quot;</span><span class="p">)</span> <span class="p">{</span> <span class="ss">a</span> <span class="o">=</span> <span class="p">[</span> <span class="s2">&quot;1&quot;</span> <span class="s2">&quot;2&quot;</span> <span class="p">];</span> <span class="ss">b</span> <span class="o">=</span> <span class="p">[</span> <span class="s2">&quot;3&quot;</span> <span class="s2">&quot;4&quot;</span> <span class="p">];</span> <span class="p">}</span>
<span class="o">=&gt;</span> <span class="p">[</span> <span class="s2">&quot;1-3&quot;</span> <span class="s2">&quot;1-4&quot;</span> <span class="s2">&quot;2-3&quot;</span> <span class="s2">&quot;2-4&quot;</span> <span class="p">]</span>
</code></pre></div>
</div>
<p>Located at <a href="https://github.com/NixOS/nixpkgs/blob/master/lib/attrsets.nix#L948">lib/attrsets.nix:948</a> in <code>&lt;nixpkgs&gt;</code>.</p>
<h2 id="function-library-lib.attrsets.nameValuePair"><code>lib.attrsets.nameValuePair</code></h2>
<p>Utility function that creates a <code>{name, value}</code> pair as expected by <code>builtins.listToAttrs</code>.</p>
<h3 id="inputs_16">Inputs</h3>
<p><code>name</code></p>
<p>: Attribute name</p>
<p><code>value</code></p>
<p>: Attribute value</p>
<h3 id="type_18">Type</h3>
<div class="highlight"><pre><span></span><code>nameValuePair :: String -&gt; Any -&gt; { name :: String; value :: Any; }
</code></pre></div>
<h3 id="examples_18">Examples</h3>
<div class="admonition example">
<p class="admonition-title"><code>lib.attrsets.nameValuePair</code> usage example</p>
<div class="highlight"><pre><span></span><code>nameValuePair <span class="s2">&quot;some&quot;</span> <span class="mi">6</span>
<span class="o">=&gt;</span> <span class="p">{</span> <span class="ss">name</span> <span class="o">=</span> <span class="s2">&quot;some&quot;</span><span class="p">;</span> <span class="ss">value</span> <span class="o">=</span> <span class="mi">6</span><span class="p">;</span> <span class="p">}</span>
</code></pre></div>
</div>
<p>Located at <a href="https://github.com/NixOS/nixpkgs/blob/master/lib/attrsets.nix#L981">lib/attrsets.nix:981</a> in <code>&lt;nixpkgs&gt;</code>.</p>
<h2 id="function-library-lib.attrsets.mapAttrs"><code>lib.attrsets.mapAttrs</code></h2>
<p>Apply a function to each element in an attribute set, creating a new attribute set.</p>
<h3 id="inputs_17">Inputs</h3>
<p><code>f</code></p>
<p>: A function that takes an attribute name and its value, and returns the new value for the attribute.</p>
<p><code>attrset</code></p>
<p>: The attribute set to iterate through.</p>
<h3 id="type_19">Type</h3>
<div class="highlight"><pre><span></span><code>mapAttrs :: (String -&gt; Any -&gt; Any) -&gt; AttrSet -&gt; AttrSet
</code></pre></div>
<h3 id="examples_19">Examples</h3>
<div class="admonition example">
<p class="admonition-title"><code>lib.attrsets.mapAttrs</code> usage example</p>
<div class="highlight"><pre><span></span><code>mapAttrs <span class="p">(</span>name<span class="p">:</span> value<span class="p">:</span> name <span class="o">+</span> <span class="s2">&quot;-&quot;</span> <span class="o">+</span> value<span class="p">)</span>
<span class="p">{</span> <span class="ss">x</span> <span class="o">=</span> <span class="s2">&quot;foo&quot;</span><span class="p">;</span> <span class="ss">y</span> <span class="o">=</span> <span class="s2">&quot;bar&quot;</span><span class="p">;</span> <span class="p">}</span>
<span class="o">=&gt;</span> <span class="p">{</span> <span class="ss">x</span> <span class="o">=</span> <span class="s2">&quot;x-foo&quot;</span><span class="p">;</span> <span class="ss">y</span> <span class="o">=</span> <span class="s2">&quot;y-bar&quot;</span><span class="p">;</span> <span class="p">}</span>
</code></pre></div>
</div>
<p>Located at <a href="https://github.com/NixOS/nixpkgs/blob/master/lib/attrsets.nix#L1018">lib/attrsets.nix:1018</a> in <code>&lt;nixpkgs&gt;</code>.</p>
<h2 id="function-library-lib.attrsets.mapAttrs-prime"><code>lib.attrsets.mapAttrs'</code></h2>
<p>Like <code>mapAttrs</code>, but allows the name of each attribute to be
changed in addition to the value. The applied function should
return both the new name and value as a <code>nameValuePair</code>.</p>
<h3 id="inputs_18">Inputs</h3>
<p><code>f</code></p>
<p>: A function, given an attribute's name and value, returns a new <code>nameValuePair</code>.</p>
<p><code>set</code></p>
<p>: Attribute set to map over.</p>
<h3 id="type_20">Type</h3>
<div class="highlight"><pre><span></span><code>mapAttrs&#39; :: (String -&gt; Any -&gt; { name :: String; value :: Any; }) -&gt; AttrSet -&gt; AttrSet
</code></pre></div>
<h3 id="examples_20">Examples</h3>
<div class="admonition example">
<p class="admonition-title"><code>lib.attrsets.mapAttrs'</code> usage example</p>
<div class="highlight"><pre><span></span><code>mapAttrs&#39; <span class="p">(</span>name<span class="p">:</span> value<span class="p">:</span> nameValuePair <span class="p">(</span><span class="s2">&quot;foo_&quot;</span> <span class="o">+</span> name<span class="p">)</span> <span class="p">(</span><span class="s2">&quot;bar-&quot;</span> <span class="o">+</span> value<span class="p">))</span>
<span class="p">{</span> <span class="ss">x</span> <span class="o">=</span> <span class="s2">&quot;a&quot;</span><span class="p">;</span> <span class="ss">y</span> <span class="o">=</span> <span class="s2">&quot;b&quot;</span><span class="p">;</span> <span class="p">}</span>
<span class="o">=&gt;</span> <span class="p">{</span> <span class="ss">foo_x</span> <span class="o">=</span> <span class="s2">&quot;bar-a&quot;</span><span class="p">;</span> <span class="ss">foo_y</span> <span class="o">=</span> <span class="s2">&quot;bar-b&quot;</span><span class="p">;</span> <span class="p">}</span>
</code></pre></div>
</div>
<p>Located at <a href="https://github.com/NixOS/nixpkgs/blob/master/lib/attrsets.nix#L1055">lib/attrsets.nix:1055</a> in <code>&lt;nixpkgs&gt;</code>.</p>
<h2 id="function-library-lib.attrsets.mapAttrsToList"><code>lib.attrsets.mapAttrsToList</code></h2>
<p>Call a function for each attribute in the given set and return
the result in a list.</p>
<h3 id="inputs_19">Inputs</h3>
<p><code>f</code></p>
<p>: A function, given an attribute's name and value, returns a new value.</p>
<p><code>attrs</code></p>
<p>: Attribute set to map over.</p>
<h3 id="type_21">Type</h3>
<div class="highlight"><pre><span></span><code>mapAttrsToList :: (String -&gt; a -&gt; b) -&gt; AttrSet -&gt; [b]
</code></pre></div>
<h3 id="examples_21">Examples</h3>
<div class="admonition example">
<p class="admonition-title"><code>lib.attrsets.mapAttrsToList</code> usage example</p>
<div class="highlight"><pre><span></span><code>mapAttrsToList <span class="p">(</span>name<span class="p">:</span> value<span class="p">:</span> name <span class="o">+</span> value<span class="p">)</span>
<span class="p">{</span> <span class="ss">x</span> <span class="o">=</span> <span class="s2">&quot;a&quot;</span><span class="p">;</span> <span class="ss">y</span> <span class="o">=</span> <span class="s2">&quot;b&quot;</span><span class="p">;</span> <span class="p">}</span>
<span class="o">=&gt;</span> <span class="p">[</span> <span class="s2">&quot;xa&quot;</span> <span class="s2">&quot;yb&quot;</span> <span class="p">]</span>
</code></pre></div>
</div>
<p>Located at <a href="https://github.com/NixOS/nixpkgs/blob/master/lib/attrsets.nix#L1093">lib/attrsets.nix:1093</a> in <code>&lt;nixpkgs&gt;</code>.</p>
<h2 id="function-library-lib.attrsets.attrsToList"><code>lib.attrsets.attrsToList</code></h2>
<p>Deconstruct an attrset to a list of name-value pairs as expected by <a href="https://nixos.org/manual/nix/stable/language/builtins.html#builtins-listToAttrs"><code>builtins.listToAttrs</code></a>.
Each element of the resulting list is an attribute set with these attributes:
- <code>name</code> (string): The name of the attribute
- <code>value</code> (any): The value of the attribute</p>
<p>The following is always true:
<div class="highlight"><pre><span></span><code><span class="nb">builtins</span><span class="o">.</span>listToAttrs <span class="p">(</span>attrsToList attrs<span class="p">)</span> <span class="o">==</span> attrs
</code></pre></div></p>
<div class="admonition warning">
<p class="admonition-title">Warning</p>
<p>The opposite is not always true. In general expect that
<div class="highlight"><pre><span></span><code>attrsToList <span class="p">(</span><span class="nb">builtins</span><span class="o">.</span>listToAttrs list<span class="p">)</span> <span class="o">!=</span> list
</code></pre></div></p>
</div>
<p>This is because the <code>listToAttrs</code> removes duplicate names and doesn't preserve the order of the list.</p>
<h3 id="inputs_20">Inputs</h3>
<p><code>set</code></p>
<p>: The attribute set to deconstruct.</p>
<h3 id="type_22">Type</h3>
<div class="highlight"><pre><span></span><code>attrsToList :: AttrSet -&gt; [ { name :: String; value :: Any; } ]
</code></pre></div>
<h3 id="examples_22">Examples</h3>
<div class="admonition example">
<p class="admonition-title"><code>lib.attrsets.attrsToList</code> usage example</p>
<div class="highlight"><pre><span></span><code>attrsToList <span class="p">{</span> <span class="ss">foo</span> <span class="o">=</span> <span class="mi">1</span><span class="p">;</span> <span class="ss">bar</span> <span class="o">=</span> <span class="s2">&quot;asdf&quot;</span><span class="p">;</span> <span class="p">}</span>
<span class="o">=&gt;</span> <span class="p">[</span> <span class="p">{</span> <span class="ss">name</span> <span class="o">=</span> <span class="s2">&quot;bar&quot;</span><span class="p">;</span> <span class="ss">value</span> <span class="o">=</span> <span class="s2">&quot;asdf&quot;</span><span class="p">;</span> <span class="p">}</span> <span class="p">{</span> <span class="ss">name</span> <span class="o">=</span> <span class="s2">&quot;foo&quot;</span><span class="p">;</span> <span class="ss">value</span> <span class="o">=</span> <span class="mi">1</span><span class="p">;</span> <span class="p">}</span> <span class="p">]</span>
</code></pre></div>
</div>
<p>Located at <a href="https://github.com/NixOS/nixpkgs/blob/master/lib/attrsets.nix#L1141">lib/attrsets.nix:1141</a> in <code>&lt;nixpkgs&gt;</code>.</p>
<h2 id="function-library-lib.attrsets.mapAttrsRecursive"><code>lib.attrsets.mapAttrsRecursive</code></h2>
<p>Like <code>mapAttrs</code>, except that it recursively applies itself to the <em>leaf</em> attributes of a potentially-nested attribute set:
the second argument of the function will never be an attrset.
Also, the first argument of the mapping function is a <em>list</em> of the attribute names that form the path to the leaf attribute.</p>
<p>For a function that gives you control over what counts as a leaf, see <code>mapAttrsRecursiveCond</code>.</p>
<p>{#map-attrs-recursive-example .example}</p>
<h3 id="map-over-leaf-attributes">Map over leaf attributes</h3>
<p><div class="highlight"><pre><span></span><code>mapAttrsRecursive <span class="p">(</span>path<span class="p">:</span> value<span class="p">:</span> concatStringsSep <span class="s2">&quot;-&quot;</span> <span class="p">(</span>path <span class="o">++</span> <span class="p">[</span>value<span class="p">]))</span>
<span class="p">{</span> <span class="ss">n</span> <span class="o">=</span> <span class="p">{</span> <span class="ss">a</span> <span class="o">=</span> <span class="s2">&quot;A&quot;</span><span class="p">;</span> <span class="ss">m</span> <span class="o">=</span> <span class="p">{</span> <span class="ss">b</span> <span class="o">=</span> <span class="s2">&quot;B&quot;</span><span class="p">;</span> <span class="ss">c</span> <span class="o">=</span> <span class="s2">&quot;C&quot;</span><span class="p">;</span> <span class="p">};</span> <span class="p">};</span> <span class="ss">d</span> <span class="o">=</span> <span class="s2">&quot;D&quot;</span><span class="p">;</span> <span class="p">}</span>
</code></pre></div>
evaluates to
<div class="highlight"><pre><span></span><code><span class="p">{</span> <span class="ss">n</span> <span class="o">=</span> <span class="p">{</span> <span class="ss">a</span> <span class="o">=</span> <span class="s2">&quot;n-a-A&quot;</span><span class="p">;</span> <span class="ss">m</span> <span class="o">=</span> <span class="p">{</span> <span class="ss">b</span> <span class="o">=</span> <span class="s2">&quot;n-m-b-B&quot;</span><span class="p">;</span> <span class="ss">c</span> <span class="o">=</span> <span class="s2">&quot;n-m-c-C&quot;</span><span class="p">;</span> <span class="p">};</span> <span class="p">};</span> <span class="ss">d</span> <span class="o">=</span> <span class="s2">&quot;d-D&quot;</span><span class="p">;</span> <span class="p">}</span>
</code></pre></div></p>
<h3 id="type_23">Type</h3>
<div class="highlight"><pre><span></span><code>mapAttrsRecursive :: ([String] -&gt; a -&gt; b) -&gt; AttrSet -&gt; AttrSet
</code></pre></div>
<p>Located at <a href="https://github.com/NixOS/nixpkgs/blob/master/lib/attrsets.nix#L1169">lib/attrsets.nix:1169</a> in <code>&lt;nixpkgs&gt;</code>.</p>
<h2 id="function-library-lib.attrsets.mapAttrsRecursiveCond"><code>lib.attrsets.mapAttrsRecursiveCond</code></h2>
<p>Like <code>mapAttrsRecursive</code>, but it takes an additional predicate that tells it whether to recurse into an attribute set.
If the predicate returns false, <code>mapAttrsRecursiveCond</code> does not recurse, but instead applies the mapping function.
If the predicate returns true, it does recurse, and does not apply the mapping function.</p>
<p>{#map-attrs-recursive-cond-example .example}</p>
<h3 id="map-over-an-leaf-attributes-defined-by-a-condition">Map over an leaf attributes defined by a condition</h3>
<p>Map derivations to their <code>name</code> attribute.
Derivatons are identified as attribute sets that contain <code>{ type = "derivation"; }</code>.
<div class="highlight"><pre><span></span><code>mapAttrsRecursiveCond
<span class="p">(</span>as<span class="p">:</span> <span class="o">!</span><span class="p">(</span>as <span class="o">?</span> <span class="s2">&quot;type&quot;</span> <span class="o">&amp;&amp;</span> as<span class="o">.</span><span class="ss">type</span> <span class="o">==</span> <span class="s2">&quot;derivation&quot;</span><span class="p">))</span>
<span class="p">(</span>x<span class="p">:</span> x<span class="o">.</span>name<span class="p">)</span>
attrs
</code></pre></div></p>
<h3 id="type_24">Type</h3>
<div class="highlight"><pre><span></span><code>mapAttrsRecursiveCond :: (AttrSet -&gt; Bool) -&gt; ([String] -&gt; a -&gt; b) -&gt; AttrSet -&gt; AttrSet
</code></pre></div>
<p>Located at <a href="https://github.com/NixOS/nixpkgs/blob/master/lib/attrsets.nix#L1198">lib/attrsets.nix:1198</a> in <code>&lt;nixpkgs&gt;</code>.</p>
<h2 id="function-library-lib.attrsets.genAttrs"><code>lib.attrsets.genAttrs</code></h2>
<p>Generate an attribute set by mapping a function over a list of
attribute names.</p>
<h3 id="inputs_21">Inputs</h3>
<p><code>names</code></p>
<p>: Names of values in the resulting attribute set.</p>
<p><code>f</code></p>
<p>: A function, given the name of the attribute, returns the attribute's value.</p>
<h3 id="type_25">Type</h3>
<div class="highlight"><pre><span></span><code>genAttrs :: [ String ] -&gt; (String -&gt; Any) -&gt; AttrSet
</code></pre></div>
<h3 id="examples_23">Examples</h3>
<div class="admonition example">
<p class="admonition-title"><code>lib.attrsets.genAttrs</code> usage example</p>
<div class="highlight"><pre><span></span><code>genAttrs <span class="p">[</span> <span class="s2">&quot;foo&quot;</span> <span class="s2">&quot;bar&quot;</span> <span class="p">]</span> <span class="p">(</span>name<span class="p">:</span> <span class="s2">&quot;x_&quot;</span> <span class="o">+</span> name<span class="p">)</span>
<span class="o">=&gt;</span> <span class="p">{</span> <span class="ss">foo</span> <span class="o">=</span> <span class="s2">&quot;x_foo&quot;</span><span class="p">;</span> <span class="ss">bar</span> <span class="o">=</span> <span class="s2">&quot;x_bar&quot;</span><span class="p">;</span> <span class="p">}</span>
</code></pre></div>
</div>
<p>Located at <a href="https://github.com/NixOS/nixpkgs/blob/master/lib/attrsets.nix#L1245">lib/attrsets.nix:1245</a> in <code>&lt;nixpkgs&gt;</code>.</p>
<h2 id="function-library-lib.attrsets.isDerivation"><code>lib.attrsets.isDerivation</code></h2>
<p>Check whether the argument is a derivation. Any set with
<code>{ type = "derivation"; }</code> counts as a derivation.</p>
<h3 id="inputs_22">Inputs</h3>
<p><code>value</code></p>
<p>: Value to check.</p>
<h3 id="type_26">Type</h3>
<div class="highlight"><pre><span></span><code>isDerivation :: Any -&gt; Bool
</code></pre></div>
<h3 id="examples_24">Examples</h3>
<div class="admonition example">
<p class="admonition-title"><code>lib.attrsets.isDerivation</code> usage example</p>
<div class="highlight"><pre><span></span><code><span class="ss">nixpkgs</span> <span class="o">=</span> <span class="nb">import</span> <span class="l">&lt;nixpkgs&gt;</span> <span class="p">{}</span>
isDerivation nixpkgs<span class="o">.</span><span class="ss">ruby</span>
<span class="o">=&gt;</span> <span class="no">true</span>
isDerivation <span class="s2">&quot;foobar&quot;</span>
<span class="o">=&gt;</span> <span class="no">false</span>
</code></pre></div>
</div>
<p>Located at <a href="https://github.com/NixOS/nixpkgs/blob/master/lib/attrsets.nix#L1282">lib/attrsets.nix:1282</a> in <code>&lt;nixpkgs&gt;</code>.</p>
<h2 id="function-library-lib.attrsets.toDerivation"><code>lib.attrsets.toDerivation</code></h2>
<p>Converts a store path to a fake derivation.</p>
<h3 id="inputs_23">Inputs</h3>
<p><code>path</code></p>
<p>: A store path to convert to a derivation.</p>
<h3 id="type_27">Type</h3>
<div class="highlight"><pre><span></span><code>toDerivation :: Path -&gt; Derivation
</code></pre></div>
<p>Located at <a href="https://github.com/NixOS/nixpkgs/blob/master/lib/attrsets.nix#L1301">lib/attrsets.nix:1301</a> in <code>&lt;nixpkgs&gt;</code>.</p>
<h2 id="function-library-lib.attrsets.optionalAttrs"><code>lib.attrsets.optionalAttrs</code></h2>
<p>If <code>cond</code> is true, return the attribute set <code>as</code>,
otherwise an empty attribute set.</p>
<h3 id="inputs_24">Inputs</h3>
<p><code>cond</code></p>
<p>: Condition under which the <code>as</code> attribute set is returned.</p>
<p><code>as</code></p>
<p>: The attribute set to return if <code>cond</code> is <code>true</code>.</p>
<h3 id="type_28">Type</h3>
<div class="highlight"><pre><span></span><code>optionalAttrs :: Bool -&gt; AttrSet -&gt; AttrSet
</code></pre></div>
<h3 id="examples_25">Examples</h3>
<div class="admonition example">
<p class="admonition-title"><code>lib.attrsets.optionalAttrs</code> usage example</p>
<div class="highlight"><pre><span></span><code>optionalAttrs <span class="p">(</span><span class="no">true</span><span class="p">)</span> <span class="p">{</span> <span class="ss">my</span> <span class="o">=</span> <span class="s2">&quot;set&quot;</span><span class="p">;</span> <span class="p">}</span>
<span class="o">=&gt;</span> <span class="p">{</span> <span class="ss">my</span> <span class="o">=</span> <span class="s2">&quot;set&quot;</span><span class="p">;</span> <span class="p">}</span>
optionalAttrs <span class="p">(</span><span class="no">false</span><span class="p">)</span> <span class="p">{</span> <span class="ss">my</span> <span class="o">=</span> <span class="s2">&quot;set&quot;</span><span class="p">;</span> <span class="p">}</span>
<span class="o">=&gt;</span> <span class="p">{</span> <span class="p">}</span>
</code></pre></div>
</div>
<p>Located at <a href="https://github.com/NixOS/nixpkgs/blob/master/lib/attrsets.nix#L1350">lib/attrsets.nix:1350</a> in <code>&lt;nixpkgs&gt;</code>.</p>
<h2 id="function-library-lib.attrsets.zipAttrsWithNames"><code>lib.attrsets.zipAttrsWithNames</code></h2>
<p>Merge sets of attributes and use the function <code>f</code> to merge attributes
values.</p>
<h3 id="inputs_25">Inputs</h3>
<p><code>names</code></p>
<p>: List of attribute names to zip.</p>
<p><code>f</code></p>
<p>: A function, accepts an attribute name, all the values, and returns a combined value.</p>
<p><code>sets</code></p>
<p>: List of values from the list of attribute sets.</p>
<h3 id="type_29">Type</h3>
<div class="highlight"><pre><span></span><code>zipAttrsWithNames :: [ String ] -&gt; (String -&gt; [ Any ] -&gt; Any) -&gt; [ AttrSet ] -&gt; AttrSet
</code></pre></div>
<h3 id="examples_26">Examples</h3>
<div class="admonition example">
<p class="admonition-title"><code>lib.attrsets.zipAttrsWithNames</code> usage example</p>
<div class="highlight"><pre><span></span><code>zipAttrsWithNames <span class="p">[</span><span class="s2">&quot;a&quot;</span><span class="p">]</span> <span class="p">(</span>name<span class="p">:</span> vs<span class="p">:</span> vs<span class="p">)</span> <span class="p">[{</span><span class="ss">a</span> <span class="o">=</span> <span class="s2">&quot;x&quot;</span><span class="p">;}</span> <span class="p">{</span><span class="ss">a</span> <span class="o">=</span> <span class="s2">&quot;y&quot;</span><span class="p">;</span> <span class="ss">b</span> <span class="o">=</span> <span class="s2">&quot;z&quot;</span><span class="p">;}]</span>
<span class="o">=&gt;</span> <span class="p">{</span> <span class="ss">a</span> <span class="o">=</span> <span class="p">[</span><span class="s2">&quot;x&quot;</span> <span class="s2">&quot;y&quot;</span><span class="p">];</span> <span class="p">}</span>
</code></pre></div>
</div>
<p>Located at <a href="https://github.com/NixOS/nixpkgs/blob/master/lib/attrsets.nix#L1392">lib/attrsets.nix:1392</a> in <code>&lt;nixpkgs&gt;</code>.</p>
<h2 id="function-library-lib.attrsets.zipAttrsWith"><code>lib.attrsets.zipAttrsWith</code></h2>
<p>Merge sets of attributes and use the function f to merge attribute values.
Like <code>lib.attrsets.zipAttrsWithNames</code> with all key names are passed for <code>names</code>.</p>
<p>Implementation note: Common names appear multiple times in the list of
names, hopefully this does not affect the system because the maximal
laziness avoid computing twice the same expression and <code>listToAttrs</code> does
not care about duplicated attribute names.</p>
<h3 id="type_30">Type</h3>
<div class="highlight"><pre><span></span><code>zipAttrsWith :: (String -&gt; [ Any ] -&gt; Any) -&gt; [ AttrSet ] -&gt; AttrSet
</code></pre></div>
<h3 id="examples_27">Examples</h3>
<div class="admonition example">
<p class="admonition-title"><code>lib.attrsets.zipAttrsWith</code> usage example</p>
<div class="highlight"><pre><span></span><code>zipAttrsWith <span class="p">(</span>name<span class="p">:</span> values<span class="p">:</span> values<span class="p">)</span> <span class="p">[{</span><span class="ss">a</span> <span class="o">=</span> <span class="s2">&quot;x&quot;</span><span class="p">;}</span> <span class="p">{</span><span class="ss">a</span> <span class="o">=</span> <span class="s2">&quot;y&quot;</span><span class="p">;</span> <span class="ss">b</span> <span class="o">=</span> <span class="s2">&quot;z&quot;</span><span class="p">;}]</span>
<span class="o">=&gt;</span> <span class="p">{</span> <span class="ss">a</span> <span class="o">=</span> <span class="p">[</span><span class="s2">&quot;x&quot;</span> <span class="s2">&quot;y&quot;</span><span class="p">];</span> <span class="ss">b</span> <span class="o">=</span> <span class="p">[</span><span class="s2">&quot;z&quot;</span><span class="p">];</span> <span class="p">}</span>
</code></pre></div>
</div>
<p>Located at <a href="https://github.com/NixOS/nixpkgs/blob/master/lib/attrsets.nix#L1428">lib/attrsets.nix:1428</a> in <code>&lt;nixpkgs&gt;</code>.</p>
<h2 id="function-library-lib.attrsets.zipAttrs"><code>lib.attrsets.zipAttrs</code></h2>
<p>Merge sets of attributes and combine each attribute value in to a list.</p>
<p>Like <code>lib.attrsets.zipAttrsWith</code> with <code>(name: values: values)</code> as the function.</p>
<h3 id="type_31">Type</h3>
<div class="highlight"><pre><span></span><code>zipAttrs :: [ AttrSet ] -&gt; AttrSet
</code></pre></div>
<h3 id="examples_28">Examples</h3>
<div class="admonition example">
<p class="admonition-title"><code>lib.attrsets.zipAttrs</code> usage example</p>
<div class="highlight"><pre><span></span><code>zipAttrs <span class="p">[{</span><span class="ss">a</span> <span class="o">=</span> <span class="s2">&quot;x&quot;</span><span class="p">;}</span> <span class="p">{</span><span class="ss">a</span> <span class="o">=</span> <span class="s2">&quot;y&quot;</span><span class="p">;</span> <span class="ss">b</span> <span class="o">=</span> <span class="s2">&quot;z&quot;</span><span class="p">;}]</span>
<span class="o">=&gt;</span> <span class="p">{</span> <span class="ss">a</span> <span class="o">=</span> <span class="p">[</span><span class="s2">&quot;x&quot;</span> <span class="s2">&quot;y&quot;</span><span class="p">];</span> <span class="ss">b</span> <span class="o">=</span> <span class="p">[</span><span class="s2">&quot;z&quot;</span><span class="p">];</span> <span class="p">}</span>
</code></pre></div>
</div>
<p>Located at <a href="https://github.com/NixOS/nixpkgs/blob/master/lib/attrsets.nix#L1454">lib/attrsets.nix:1454</a> in <code>&lt;nixpkgs&gt;</code>.</p>
<h2 id="function-library-lib.attrsets.mergeAttrsList"><code>lib.attrsets.mergeAttrsList</code></h2>
<p>Merge a list of attribute sets together using the <code>//</code> operator.
In case of duplicate attributes, values from later list elements take precedence over earlier ones.
The result is the same as <code>foldl mergeAttrs { }</code>, but the performance is better for large inputs.
For n list elements, each with an attribute set containing m unique attributes, the complexity of this operation is O(nm log n).</p>
<h3 id="inputs_26">Inputs</h3>
<p><code>list</code></p>
<p>: 1. Function argument</p>
<h3 id="type_32">Type</h3>
<div class="highlight"><pre><span></span><code>mergeAttrsList :: [ Attrs ] -&gt; Attrs
</code></pre></div>
<h3 id="examples_29">Examples</h3>
<div class="admonition example">
<p class="admonition-title"><code>lib.attrsets.mergeAttrsList</code> usage example</p>
<div class="highlight"><pre><span></span><code>mergeAttrsList <span class="p">[</span> <span class="p">{</span> <span class="ss">a</span> <span class="o">=</span> <span class="mi">0</span><span class="p">;</span> <span class="ss">b</span> <span class="o">=</span> <span class="mi">1</span><span class="p">;</span> <span class="p">}</span> <span class="p">{</span> <span class="ss">c</span> <span class="o">=</span> <span class="mi">2</span><span class="p">;</span> <span class="ss">d</span> <span class="o">=</span> <span class="mi">3</span><span class="p">;</span> <span class="p">}</span> <span class="p">]</span>
<span class="o">=&gt;</span> <span class="p">{</span> <span class="ss">a</span> <span class="o">=</span> <span class="mi">0</span><span class="p">;</span> <span class="ss">b</span> <span class="o">=</span> <span class="mi">1</span><span class="p">;</span> <span class="ss">c</span> <span class="o">=</span> <span class="mi">2</span><span class="p">;</span> <span class="ss">d</span> <span class="o">=</span> <span class="mi">3</span><span class="p">;</span> <span class="p">}</span>
mergeAttrsList <span class="p">[</span> <span class="p">{</span> <span class="ss">a</span> <span class="o">=</span> <span class="mi">0</span><span class="p">;</span> <span class="p">}</span> <span class="p">{</span> <span class="ss">a</span> <span class="o">=</span> <span class="mi">1</span><span class="p">;</span> <span class="p">}</span> <span class="p">]</span>
<span class="o">=&gt;</span> <span class="p">{</span> <span class="ss">a</span> <span class="o">=</span> <span class="mi">1</span><span class="p">;</span> <span class="p">}</span>
</code></pre></div>
</div>
<p>Located at <a href="https://github.com/NixOS/nixpkgs/blob/master/lib/attrsets.nix#L1488">lib/attrsets.nix:1488</a> in <code>&lt;nixpkgs&gt;</code>.</p>
<h2 id="function-library-lib.attrsets.recursiveUpdateUntil"><code>lib.attrsets.recursiveUpdateUntil</code></h2>
<p>Does the same as the update operator '//' except that attributes are
merged until the given predicate is verified. The predicate should
accept 3 arguments which are the path to reach the attribute, a part of
the first attribute set and a part of the second attribute set. When
the predicate is satisfied, the value of the first attribute set is
replaced by the value of the second attribute set.</p>
<h3 id="inputs_27">Inputs</h3>
<p><code>pred</code></p>
<p>: Predicate, taking the path to the current attribute as a list of strings for attribute names, and the two values at that path from the original arguments.</p>
<p><code>lhs</code></p>
<p>: Left attribute set of the merge.</p>
<p><code>rhs</code></p>
<p>: Right attribute set of the merge.</p>
<h3 id="type_33">Type</h3>
<div class="highlight"><pre><span></span><code>recursiveUpdateUntil :: ( [ String ] -&gt; AttrSet -&gt; AttrSet -&gt; Bool ) -&gt; AttrSet -&gt; AttrSet -&gt; AttrSet
</code></pre></div>
<h3 id="examples_30">Examples</h3>
<div class="admonition example">
<p class="admonition-title"><code>lib.attrsets.recursiveUpdateUntil</code> usage example</p>
<div class="highlight"><pre><span></span><code>recursiveUpdateUntil <span class="p">(</span>path<span class="p">:</span> l<span class="p">:</span> r<span class="p">:</span> <span class="ss">path</span> <span class="o">==</span> <span class="p">[</span><span class="s2">&quot;foo&quot;</span><span class="p">])</span> <span class="p">{</span>
<span class="c1"># first attribute set</span>
foo<span class="o">.</span><span class="ss">bar</span> <span class="o">=</span> <span class="mi">1</span><span class="p">;</span>
foo<span class="o">.</span><span class="ss">baz</span> <span class="o">=</span> <span class="mi">2</span><span class="p">;</span>
<span class="ss">bar</span> <span class="o">=</span> <span class="mi">3</span><span class="p">;</span>
<span class="p">}</span> <span class="p">{</span>
<span class="c1">#second attribute set</span>
foo<span class="o">.</span><span class="ss">bar</span> <span class="o">=</span> <span class="mi">1</span><span class="p">;</span>
foo<span class="o">.</span><span class="ss">quz</span> <span class="o">=</span> <span class="mi">2</span><span class="p">;</span>
<span class="ss">baz</span> <span class="o">=</span> <span class="mi">4</span><span class="p">;</span>
<span class="p">}</span>
<span class="o">=&gt;</span> <span class="p">{</span>
foo<span class="o">.</span><span class="ss">bar</span> <span class="o">=</span> <span class="mi">1</span><span class="p">;</span> <span class="c1"># &#39;foo.*&#39; from the second set</span>
foo<span class="o">.</span><span class="ss">quz</span> <span class="o">=</span> <span class="mi">2</span><span class="p">;</span> <span class="c1">#</span>
<span class="ss">bar</span> <span class="o">=</span> <span class="mi">3</span><span class="p">;</span> <span class="c1"># &#39;bar&#39; from the first set</span>
<span class="ss">baz</span> <span class="o">=</span> <span class="mi">4</span><span class="p">;</span> <span class="c1"># &#39;baz&#39; from the second set</span>
<span class="p">}</span>
</code></pre></div>
</div>
<p>Located at <a href="https://github.com/NixOS/nixpkgs/blob/master/lib/attrsets.nix#L1566">lib/attrsets.nix:1566</a> in <code>&lt;nixpkgs&gt;</code>.</p>
<h2 id="function-library-lib.attrsets.recursiveUpdate"><code>lib.attrsets.recursiveUpdate</code></h2>
<p>A recursive variant of the update operator //. The recursion
stops when one of the attribute values is not an attribute set,
in which case the right hand side value takes precedence over the
left hand side value.</p>
<h3 id="inputs_28">Inputs</h3>
<p><code>lhs</code></p>
<p>: Left attribute set of the merge.</p>
<p><code>rhs</code></p>
<p>: Right attribute set of the merge.</p>
<h3 id="type_34">Type</h3>
<div class="highlight"><pre><span></span><code>recursiveUpdate :: AttrSet -&gt; AttrSet -&gt; AttrSet
</code></pre></div>
<h3 id="examples_31">Examples</h3>
<div class="admonition example">
<p class="admonition-title"><code>lib.attrsets.recursiveUpdate</code> usage example</p>
<div class="highlight"><pre><span></span><code>recursiveUpdate <span class="p">{</span>
boot<span class="o">.</span>loader<span class="o">.</span>grub<span class="o">.</span><span class="ss">enable</span> <span class="o">=</span> <span class="no">true</span><span class="p">;</span>
boot<span class="o">.</span>loader<span class="o">.</span>grub<span class="o">.</span><span class="ss">device</span> <span class="o">=</span> <span class="s2">&quot;/dev/hda&quot;</span><span class="p">;</span>
<span class="p">}</span> <span class="p">{</span>
boot<span class="o">.</span>loader<span class="o">.</span>grub<span class="o">.</span><span class="ss">device</span> <span class="o">=</span> <span class="s2">&quot;&quot;</span><span class="p">;</span>
<span class="p">}</span>
returns<span class="p">:</span> <span class="p">{</span>
boot<span class="o">.</span>loader<span class="o">.</span>grub<span class="o">.</span><span class="ss">enable</span> <span class="o">=</span> <span class="no">true</span><span class="p">;</span>
boot<span class="o">.</span>loader<span class="o">.</span>grub<span class="o">.</span><span class="ss">device</span> <span class="o">=</span> <span class="s2">&quot;&quot;</span><span class="p">;</span>
<span class="p">}</span>
</code></pre></div>
</div>
<p>Located at <a href="https://github.com/NixOS/nixpkgs/blob/master/lib/attrsets.nix#L1625">lib/attrsets.nix:1625</a> in <code>&lt;nixpkgs&gt;</code>.</p>
<h2 id="function-library-lib.attrsets.matchAttrs"><code>lib.attrsets.matchAttrs</code></h2>
<p>Recurse into every attribute set of the first argument and check that:
- Each attribute path also exists in the second argument.
- If the attribute's value is not a nested attribute set, it must have the same value in the right argument.</p>
<h3 id="inputs_29">Inputs</h3>
<p><code>pattern</code></p>
<p>: Attribute set structure to match</p>
<p><code>attrs</code></p>
<p>: Attribute set to check</p>
<h3 id="type_35">Type</h3>
<div class="highlight"><pre><span></span><code>matchAttrs :: AttrSet -&gt; AttrSet -&gt; Bool
</code></pre></div>
<h3 id="examples_32">Examples</h3>
<div class="admonition example">
<p class="admonition-title"><code>lib.attrsets.matchAttrs</code> usage example</p>
<div class="highlight"><pre><span></span><code>matchAttrs <span class="p">{</span> <span class="ss">cpu</span> <span class="o">=</span> <span class="p">{};</span> <span class="p">}</span> <span class="p">{</span> <span class="ss">cpu</span> <span class="o">=</span> <span class="p">{</span> <span class="ss">bits</span> <span class="o">=</span> <span class="mi">64</span><span class="p">;</span> <span class="p">};</span> <span class="p">}</span>
<span class="o">=&gt;</span> <span class="no">true</span>
</code></pre></div>
</div>
<p>Located at <a href="https://github.com/NixOS/nixpkgs/blob/master/lib/attrsets.nix#L1664">lib/attrsets.nix:1664</a> in <code>&lt;nixpkgs&gt;</code>.</p>
<h2 id="function-library-lib.attrsets.overrideExisting"><code>lib.attrsets.overrideExisting</code></h2>
<p>Override only the attributes that are already present in the old set
useful for deep-overriding.</p>
<h3 id="inputs_30">Inputs</h3>
<p><code>old</code></p>
<p>: Original attribute set</p>
<p><code>new</code></p>
<p>: Attribute set with attributes to override in <code>old</code>.</p>
<h3 id="type_36">Type</h3>
<div class="highlight"><pre><span></span><code>overrideExisting :: AttrSet -&gt; AttrSet -&gt; AttrSet
</code></pre></div>
<h3 id="examples_33">Examples</h3>
<div class="admonition example">
<p class="admonition-title"><code>lib.attrsets.overrideExisting</code> usage example</p>
<div class="highlight"><pre><span></span><code>overrideExisting <span class="p">{}</span> <span class="p">{</span> <span class="ss">a</span> <span class="o">=</span> <span class="mi">1</span><span class="p">;</span> <span class="p">}</span>
<span class="o">=&gt;</span> <span class="p">{}</span>
overrideExisting <span class="p">{</span> <span class="ss">b</span> <span class="o">=</span> <span class="mi">2</span><span class="p">;</span> <span class="p">}</span> <span class="p">{</span> <span class="ss">a</span> <span class="o">=</span> <span class="mi">1</span><span class="p">;</span> <span class="p">}</span>
<span class="o">=&gt;</span> <span class="p">{</span> <span class="ss">b</span> <span class="o">=</span> <span class="mi">2</span><span class="p">;</span> <span class="p">}</span>
overrideExisting <span class="p">{</span> <span class="ss">a</span> <span class="o">=</span> <span class="mi">3</span><span class="p">;</span> <span class="ss">b</span> <span class="o">=</span> <span class="mi">2</span><span class="p">;</span> <span class="p">}</span> <span class="p">{</span> <span class="ss">a</span> <span class="o">=</span> <span class="mi">1</span><span class="p">;</span> <span class="p">}</span>
<span class="o">=&gt;</span> <span class="p">{</span> <span class="ss">a</span> <span class="o">=</span> <span class="mi">1</span><span class="p">;</span> <span class="ss">b</span> <span class="o">=</span> <span class="mi">2</span><span class="p">;</span> <span class="p">}</span>
</code></pre></div>
</div>
<p>Located at <a href="https://github.com/NixOS/nixpkgs/blob/master/lib/attrsets.nix#L1720">lib/attrsets.nix:1720</a> in <code>&lt;nixpkgs&gt;</code>.</p>
<h2 id="function-library-lib.attrsets.showAttrPath"><code>lib.attrsets.showAttrPath</code></h2>
<p>Turns a list of strings into a human-readable description of those
strings represented as an attribute path. The result of this function is
not intended to be machine-readable.
Create a new attribute set with <code>value</code> set at the nested attribute location specified in <code>attrPath</code>.</p>
<h3 id="inputs_31">Inputs</h3>
<p><code>path</code></p>
<p>: Attribute path to render to a string</p>
<h3 id="type_37">Type</h3>
<div class="highlight"><pre><span></span><code>showAttrPath :: [String] -&gt; String
</code></pre></div>
<h3 id="examples_34">Examples</h3>
<div class="admonition example">
<p class="admonition-title"><code>lib.attrsets.showAttrPath</code> usage example</p>
<div class="highlight"><pre><span></span><code>showAttrPath <span class="p">[</span> <span class="s2">&quot;foo&quot;</span> <span class="s2">&quot;10&quot;</span> <span class="s2">&quot;bar&quot;</span> <span class="p">]</span>
<span class="o">=&gt;</span> <span class="s2">&quot;foo.</span><span class="se">\&quot;</span><span class="s2">10</span><span class="se">\&quot;</span><span class="s2">.bar&quot;</span>
showAttrPath <span class="p">[]</span>
<span class="o">=&gt;</span> <span class="s2">&quot;&lt;root attribute path&gt;&quot;</span>
</code></pre></div>
</div>
<p>Located at <a href="https://github.com/NixOS/nixpkgs/blob/master/lib/attrsets.nix#L1758">lib/attrsets.nix:1758</a> in <code>&lt;nixpkgs&gt;</code>.</p>
<h2 id="function-library-lib.attrsets.getOutput"><code>lib.attrsets.getOutput</code></h2>
<p>Get a package output.
If no output is found, fallback to <code>.out</code> and then to the default.
The function is idempotent: <code>getOutput "b" (getOutput "a" p) == getOutput "a" p</code>.</p>
<h3 id="inputs_32">Inputs</h3>
<p><code>output</code></p>
<p>: 1. Function argument</p>
<p><code>pkg</code></p>
<p>: 2. Function argument</p>
<h3 id="type_38">Type</h3>
<div class="highlight"><pre><span></span><code>getOutput :: String -&gt; :: Derivation -&gt; Derivation
</code></pre></div>
<h3 id="examples_35">Examples</h3>
<div class="admonition example">
<p class="admonition-title"><code>lib.attrsets.getOutput</code> usage example</p>
<div class="highlight"><pre><span></span><code><span class="s2">&quot;</span><span class="si">${</span>getOutput <span class="s2">&quot;dev&quot;</span> pkgs<span class="o">.</span>openssl<span class="si">}</span><span class="s2">&quot;</span>
<span class="o">=&gt;</span> <span class="s2">&quot;/nix/store/9rz8gxhzf8sw4kf2j2f1grr49w8zx5vj-openssl-1.0.1r-dev&quot;</span>
</code></pre></div>
</div>
<p>Located at <a href="https://github.com/NixOS/nixpkgs/blob/master/lib/attrsets.nix#L1797">lib/attrsets.nix:1797</a> in <code>&lt;nixpkgs&gt;</code>.</p>
<h2 id="function-library-lib.attrsets.getFirstOutput"><code>lib.attrsets.getFirstOutput</code></h2>
<p>Get the first of the <code>outputs</code> provided by the package, or the default.
This function is alligned with <code>_overrideFirst()</code> from the <code>multiple-outputs.sh</code> setup hook.
Like <code>getOutput</code>, the function is idempotent.</p>
<h3 id="inputs_33">Inputs</h3>
<p><code>outputs</code></p>
<p>: 1. Function argument</p>
<p><code>pkg</code></p>
<p>: 2. Function argument</p>
<h3 id="type_39">Type</h3>
<div class="highlight"><pre><span></span><code>getFirstOutput :: [String] -&gt; Derivation -&gt; Derivation
</code></pre></div>
<h3 id="examples_36">Examples</h3>
<div class="admonition example">
<p class="admonition-title"><code>lib.attrsets.getFirstOutput</code> usage example</p>
<div class="highlight"><pre><span></span><code><span class="s2">&quot;</span><span class="si">${</span>getFirstOutput <span class="p">[</span> <span class="s2">&quot;include&quot;</span> <span class="s2">&quot;dev&quot;</span> <span class="p">]</span> pkgs<span class="o">.</span>openssl<span class="si">}</span><span class="s2">&quot;</span>
<span class="o">=&gt;</span> <span class="s2">&quot;/nix/store/00000000000000000000000000000000-openssl-1.0.1r-dev&quot;</span>
</code></pre></div>
</div>
<p>Located at <a href="https://github.com/NixOS/nixpkgs/blob/master/lib/attrsets.nix#L1834">lib/attrsets.nix:1834</a> in <code>&lt;nixpkgs&gt;</code>.</p>
<h2 id="function-library-lib.attrsets.getBin"><code>lib.attrsets.getBin</code></h2>
<p>Get a package's <code>bin</code> output.
If the output does not exist, fallback to <code>.out</code> and then to the default.</p>
<h3 id="inputs_34">Inputs</h3>
<p><code>pkg</code></p>
<p>: The package whose <code>bin</code> output will be retrieved.</p>
<h3 id="type_40">Type</h3>
<div class="highlight"><pre><span></span><code>getBin :: Derivation -&gt; Derivation
</code></pre></div>
<h3 id="examples_37">Examples</h3>
<div class="admonition example">
<p class="admonition-title"><code>lib.attrsets.getBin</code> usage example</p>
<div class="highlight"><pre><span></span><code><span class="s2">&quot;</span><span class="si">${</span>getBin pkgs<span class="o">.</span>openssl<span class="si">}</span><span class="s2">&quot;</span>
<span class="o">=&gt;</span> <span class="s2">&quot;/nix/store/00000000000000000000000000000000-openssl-1.0.1r&quot;</span>
</code></pre></div>
</div>
<p>Located at <a href="https://github.com/NixOS/nixpkgs/blob/master/lib/attrsets.nix#L1872">lib/attrsets.nix:1872</a> in <code>&lt;nixpkgs&gt;</code>.</p>
<h2 id="function-library-lib.attrsets.getLib"><code>lib.attrsets.getLib</code></h2>
<p>Get a package's <code>lib</code> output.
If the output does not exist, fallback to <code>.out</code> and then to the default.</p>
<h3 id="inputs_35">Inputs</h3>
<p><code>pkg</code></p>
<p>: The package whose <code>lib</code> output will be retrieved.</p>
<h3 id="type_41">Type</h3>
<div class="highlight"><pre><span></span><code>getLib :: Derivation -&gt; Derivation
</code></pre></div>
<h3 id="examples_38">Examples</h3>
<div class="admonition example">
<p class="admonition-title"><code>lib.attrsets.getLib</code> usage example</p>
<div class="highlight"><pre><span></span><code><span class="s2">&quot;</span><span class="si">${</span>getLib pkgs<span class="o">.</span>openssl<span class="si">}</span><span class="s2">&quot;</span>
<span class="o">=&gt;</span> <span class="s2">&quot;/nix/store/9rz8gxhzf8sw4kf2j2f1grr49w8zx5vj-openssl-1.0.1r-lib&quot;</span>
</code></pre></div>
</div>
<p>Located at <a href="https://github.com/NixOS/nixpkgs/blob/master/lib/attrsets.nix#L1902">lib/attrsets.nix:1902</a> in <code>&lt;nixpkgs&gt;</code>.</p>
<h2 id="function-library-lib.attrsets.getStatic"><code>lib.attrsets.getStatic</code></h2>
<p>Get a package's <code>static</code> output.
If the output does not exist, fallback to <code>.lib</code>, then to <code>.out</code>, and then to the default.</p>
<h3 id="inputs_36">Inputs</h3>
<p><code>pkg</code></p>
<p>: The package whose <code>static</code> output will be retrieved.</p>
<h3 id="type_42">Type</h3>
<div class="highlight"><pre><span></span><code>getStatic :: Derivation -&gt; Derivation
</code></pre></div>
<h3 id="examples_39">Examples</h3>
<div class="admonition example">
<p class="admonition-title"><code>lib.attrsets.getStatic</code> usage example</p>
<div class="highlight"><pre><span></span><code><span class="s2">&quot;</span><span class="si">${</span>lib<span class="o">.</span>getStatic pkgs<span class="o">.</span>glibc<span class="si">}</span><span class="s2">&quot;</span>
<span class="o">=&gt;</span> <span class="s2">&quot;/nix/store/00000000000000000000000000000000-glibc-2.39-52-static&quot;</span>
</code></pre></div>
</div>
<p>Located at <a href="https://github.com/NixOS/nixpkgs/blob/master/lib/attrsets.nix#L1931">lib/attrsets.nix:1931</a> in <code>&lt;nixpkgs&gt;</code>.</p>
<h2 id="function-library-lib.attrsets.getDev"><code>lib.attrsets.getDev</code></h2>
<p>Get a package's <code>dev</code> output.
If the output does not exist, fallback to <code>.out</code> and then to the default.</p>
<h3 id="inputs_37">Inputs</h3>
<p><code>pkg</code></p>
<p>: The package whose <code>dev</code> output will be retrieved.</p>
<h3 id="type_43">Type</h3>
<div class="highlight"><pre><span></span><code>getDev :: Derivation -&gt; Derivation
</code></pre></div>
<h3 id="examples_40">Examples</h3>
<div class="admonition example">
<p class="admonition-title"><code>lib.attrsets.getDev</code> usage example</p>
<div class="highlight"><pre><span></span><code><span class="s2">&quot;</span><span class="si">${</span>getDev pkgs<span class="o">.</span>openssl<span class="si">}</span><span class="s2">&quot;</span>
<span class="o">=&gt;</span> <span class="s2">&quot;/nix/store/9rz8gxhzf8sw4kf2j2f1grr49w8zx5vj-openssl-1.0.1r-dev&quot;</span>
</code></pre></div>
</div>
<p>Located at <a href="https://github.com/NixOS/nixpkgs/blob/master/lib/attrsets.nix#L1961">lib/attrsets.nix:1961</a> in <code>&lt;nixpkgs&gt;</code>.</p>
<h2 id="function-library-lib.attrsets.getInclude"><code>lib.attrsets.getInclude</code></h2>
<p>Get a package's <code>include</code> output.
If the output does not exist, fallback to <code>.dev</code>, then to <code>.out</code>, and then to the default.</p>
<h3 id="inputs_38">Inputs</h3>
<p><code>pkg</code></p>
<p>: The package whose <code>include</code> output will be retrieved.</p>
<h3 id="type_44">Type</h3>
<div class="highlight"><pre><span></span><code>getInclude :: Derivation -&gt; Derivation
</code></pre></div>
<h3 id="examples_41">Examples</h3>
<div class="admonition example">
<p class="admonition-title"><code>lib.attrsets.getInclude</code> usage example</p>
<div class="highlight"><pre><span></span><code><span class="s2">&quot;</span><span class="si">${</span>getInclude pkgs<span class="o">.</span>openssl<span class="si">}</span><span class="s2">&quot;</span>
<span class="o">=&gt;</span> <span class="s2">&quot;/nix/store/00000000000000000000000000000000-openssl-1.0.1r-dev&quot;</span>
</code></pre></div>
</div>
<p>Located at <a href="https://github.com/NixOS/nixpkgs/blob/master/lib/attrsets.nix#L1990">lib/attrsets.nix:1990</a> in <code>&lt;nixpkgs&gt;</code>.</p>
<h2 id="function-library-lib.attrsets.getMan"><code>lib.attrsets.getMan</code></h2>
<p>Get a package's <code>man</code> output.
If the output does not exist, fallback to <code>.out</code> and then to the default.</p>
<h3 id="inputs_39">Inputs</h3>
<p><code>pkg</code></p>
<p>: The package whose <code>man</code> output will be retrieved.</p>
<h3 id="type_45">Type</h3>
<div class="highlight"><pre><span></span><code>getMan :: Derivation -&gt; Derivation
</code></pre></div>
<h3 id="examples_42">Examples</h3>
<div class="admonition example">
<p class="admonition-title"><code>lib.attrsets.getMan</code> usage example</p>
<div class="highlight"><pre><span></span><code><span class="s2">&quot;</span><span class="si">${</span>getMan pkgs<span class="o">.</span>openssl<span class="si">}</span><span class="s2">&quot;</span>
<span class="o">=&gt;</span> <span class="s2">&quot;/nix/store/9rz8gxhzf8sw4kf2j2f1grr49w8zx5vj-openssl-1.0.1r-man&quot;</span>
</code></pre></div>
</div>
<p>Located at <a href="https://github.com/NixOS/nixpkgs/blob/master/lib/attrsets.nix#L2020">lib/attrsets.nix:2020</a> in <code>&lt;nixpkgs&gt;</code>.</p>
<h2 id="function-library-lib.attrsets.chooseDevOutputs"><code>lib.attrsets.chooseDevOutputs</code></h2>
<p>Pick the outputs of packages to place in <code>buildInputs</code></p>
<h3 id="inputs_40">Inputs</h3>
<p><code>pkgs</code></p>
<p>: List of packages.</p>
<h3 id="type_46">Type</h3>
<div class="highlight"><pre><span></span><code>chooseDevOutputs :: [Derivation] -&gt; [Derivation]
</code></pre></div>
<p>Located at <a href="https://github.com/NixOS/nixpkgs/blob/master/lib/attrsets.nix#L2037">lib/attrsets.nix:2037</a> in <code>&lt;nixpkgs&gt;</code>.</p>
<h2 id="function-library-lib.attrsets.recurseIntoAttrs"><code>lib.attrsets.recurseIntoAttrs</code></h2>
<p>Make various Nix tools consider the contents of the resulting
attribute set when looking for what to build, find, etc.</p>
<p>This function only affects a single attribute set; it does not
apply itself recursively for nested attribute sets.</p>
<h3 id="inputs_41">Inputs</h3>
<p><code>attrs</code></p>
<p>: An attribute set to scan for derivations.</p>
<h3 id="type_47">Type</h3>
<div class="highlight"><pre><span></span><code>recurseIntoAttrs :: AttrSet -&gt; AttrSet
</code></pre></div>
<h3 id="examples_43">Examples</h3>
<div class="admonition example">
<p class="admonition-title"><code>lib.attrsets.recurseIntoAttrs</code> usage example</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">myTools</span> <span class="o">=</span> pkgs<span class="o">.</span>lib<span class="o">.</span>recurseIntoAttrs <span class="p">{</span>
<span class="k">inherit</span> <span class="p">(</span>pkgs<span class="p">)</span> hello figlet<span class="p">;</span>
<span class="p">};</span>
<span class="p">}</span>
</code></pre></div>
</div>
<p>Located at <a href="https://github.com/NixOS/nixpkgs/blob/master/lib/attrsets.nix#L2074">lib/attrsets.nix:2074</a> in <code>&lt;nixpkgs&gt;</code>.</p>
<h2 id="function-library-lib.attrsets.dontRecurseIntoAttrs"><code>lib.attrsets.dontRecurseIntoAttrs</code></h2>
<p>Undo the effect of recurseIntoAttrs.</p>
<h3 id="inputs_42">Inputs</h3>
<p><code>attrs</code></p>
<p>: An attribute set to not scan for derivations.</p>
<h3 id="type_48">Type</h3>
<div class="highlight"><pre><span></span><code>dontRecurseIntoAttrs :: AttrSet -&gt; AttrSet
</code></pre></div>
<p>Located at <a href="https://github.com/NixOS/nixpkgs/blob/master/lib/attrsets.nix#L2094">lib/attrsets.nix:2094</a> in <code>&lt;nixpkgs&gt;</code>.</p>
<h2 id="function-library-lib.attrsets.unionOfDisjoint"><code>lib.attrsets.unionOfDisjoint</code></h2>
<p><code>unionOfDisjoint x y</code> is equal to <code>x // y // z</code> where the
attrnames in <code>z</code> are the intersection of the attrnames in <code>x</code> and
<code>y</code>, and all values <code>assert</code> with an error message. This
operator is commutative, unlike (//).</p>
<h3 id="inputs_43">Inputs</h3>
<p><code>x</code></p>
<p>: 1. Function argument</p>
<p><code>y</code></p>
<p>: 2. Function argument</p>
<h3 id="type_49">Type</h3>
<div class="highlight"><pre><span></span><code>unionOfDisjoint :: AttrSet -&gt; AttrSet -&gt; AttrSet
</code></pre></div>
<p>Located at <a href="https://github.com/NixOS/nixpkgs/blob/master/lib/attrsets.nix#L2121">lib/attrsets.nix:2121</a> in <code>&lt;nixpkgs&gt;</code>.</p>
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