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<h1 id="sec-functions-library-options">lib.options: NixOS / nixpkgs option handling</h1>
<p>Nixpkgs/NixOS option handling.</p>
<h2 id="function-library-lib.options.isOption"><code>lib.options.isOption</code></h2>
<p><strong>Type</strong>: <code>isOption :: a -&gt; bool</code></p>
<p>Returns true when the given argument is an option</p>
<div class="admonition example">
<p class="admonition-title">Example</p>
<div class="highlight"><pre><span></span><code># `lib.options.isOption` usage example
</code></pre></div>
<div class="highlight"><pre><span></span><code>isOption <span class="mi">1</span> <span class="o">//</span> <span class="o">=&gt;</span> <span class="no">false</span>
isOption <span class="p">(</span>mkOption <span class="p">{})</span> <span class="o">//</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/options.nix#L56">lib/options.nix:56</a> in <code>&lt;nixpkgs&gt;</code>.</p>
<h2 id="function-library-lib.options.mkOption"><code>lib.options.mkOption</code></h2>
<p>Creates an Option attribute set. mkOption accepts an attribute set with the following keys:</p>
<p>All keys default to <code>null</code> when not given.</p>
<p>structured function argument</p>
<p>: <code>default</code></p>
<p>: Default value used when no definition is given in the configuration.</p>
<p><code>defaultText</code></p>
<p>: Textual representation of the default, for the manual.</p>
<p><code>example</code></p>
<p>: Example value used in the manual.</p>
<p><code>description</code></p>
<p>: String describing the option.</p>
<p><code>relatedPackages</code></p>
<p>: Related packages used in the manual (see <code>genRelatedPackages</code> in ../nixos/lib/make-options-doc/default.nix).</p>
<p><code>type</code></p>
<p>: Option type, providing type-checking and value merging.</p>
<p><code>apply</code></p>
<p>: Function that converts the option value to something else.</p>
<p><code>internal</code></p>
<p>: Whether the option is for NixOS developers only.</p>
<p><code>visible</code></p>
<p>: Whether the option shows up in the manual. Default: true. Use false to hide the option and any sub-options from submodules. Use "shallow" to hide only sub-options.</p>
<p><code>readOnly</code></p>
<p>: Whether the option can be set only once</p>
<div class="admonition example">
<p class="admonition-title">Example</p>
<h1 id="liboptionsmkoption-usage-example"><code>lib.options.mkOption</code> usage example</h1>
</div>
<div class="highlight"><pre><span></span><code>mkOption <span class="p">{</span> <span class="p">}</span> <span class="o">//</span> <span class="o">=&gt;</span> <span class="p">{</span> <span class="ss">_type</span> <span class="o">=</span> <span class="s2">&quot;option&quot;</span><span class="p">;</span> <span class="p">}</span>
mkOption <span class="p">{</span> <span class="ss">default</span> <span class="o">=</span> <span class="s2">&quot;foo&quot;</span><span class="p">;</span> <span class="p">}</span> <span class="o">//</span> <span class="o">=&gt;</span> <span class="p">{</span> <span class="ss">_type</span> <span class="o">=</span> <span class="s2">&quot;option&quot;</span><span class="p">;</span> <span class="ss">default</span> <span class="o">=</span> <span class="s2">&quot;foo&quot;</span><span class="p">;</span> <span class="p">}</span>
</code></pre></div>
<p>Located at <a href="https://github.com/NixOS/nixpkgs/blob/master/lib/options.nix#L66">lib/options.nix:66</a> in <code>&lt;nixpkgs&gt;</code>.</p>
<h2 id="function-library-lib.options.mkEnableOption"><code>lib.options.mkEnableOption</code></h2>
<p>Creates an Option attribute set for a boolean value option i.e an
option to be toggled on or off:</p>
<p><code>name</code></p>
<p>: Name for the created option</p>
<div class="admonition example">
<p class="admonition-title">Example</p>
<h1 id="liboptionsmkenableoption-usage-example"><code>lib.options.mkEnableOption</code> usage example</h1>
</div>
<div class="highlight"><pre><span></span><code>mkEnableOption <span class="s2">&quot;foo&quot;</span>
<span class="o">=&gt;</span> <span class="p">{</span> <span class="ss">_type</span> <span class="o">=</span> <span class="s2">&quot;option&quot;</span><span class="p">;</span> <span class="ss">default</span> <span class="o">=</span> <span class="no">false</span><span class="p">;</span> <span class="ss">description</span> <span class="o">=</span> <span class="s2">&quot;Whether to enable foo.&quot;</span><span class="p">;</span> <span class="ss">example</span> <span class="o">=</span> <span class="no">true</span><span class="p">;</span> <span class="ss">type</span> <span class="o">=</span> <span class="p">{</span> <span class="o">...</span> <span class="p">};</span> <span class="p">}</span>
</code></pre></div>
<p>Located at <a href="https://github.com/NixOS/nixpkgs/blob/master/lib/options.nix#L98">lib/options.nix:98</a> in <code>&lt;nixpkgs&gt;</code>.</p>
<h2 id="function-library-lib.options.mkPackageOption"><code>lib.options.mkPackageOption</code></h2>
<p><strong>Type</strong>: <code>mkPackageOption :: pkgs -&gt; (string|[string]) -&gt; { nullable? :: bool, default? :: string|[string], example? :: null|string|[string], extraDescription? :: string, pkgsText? :: string } -&gt; option</code></p>
<p>Creates an Option attribute set for an option that specifies the
package a module should use for some purpose.</p>
<p>The package is specified in the third argument under <code>default</code> as a list of strings
representing its attribute path in nixpkgs (or another package set).
Because of this, you need to pass nixpkgs itself (usually <code>pkgs</code> in a module;
alternatively to nixpkgs itself, another package set) as the first argument.</p>
<p>If you pass another package set you should set the <code>pkgsText</code> option.
This option is used to display the expression for the package set. It is <code>"pkgs"</code> by default.
If your expression is complex you should parenthesize it, as the <code>pkgsText</code> argument
is usually immediately followed by an attribute lookup (<code>.</code>).</p>
<p>The second argument may be either a string or a list of strings.
It provides the display name of the package in the description of the generated option
(using only the last element if the passed value is a list)
and serves as the fallback value for the <code>default</code> argument.</p>
<p>To include extra information in the description, pass <code>extraDescription</code> to
append arbitrary text to the generated description.</p>
<p>You can also pass an <code>example</code> value, either a literal string or an attribute path.</p>
<p>The <code>default</code> argument can be omitted if the provided name is
an attribute of pkgs (if <code>name</code> is a string) or a valid attribute path in pkgs (if <code>name</code> is a list).
You can also set <code>default</code> to just a string in which case it is interpreted as an attribute name
(a singleton attribute path, if you will).</p>
<p>If you wish to explicitly provide no default, pass <code>null</code> as <code>default</code>.</p>
<p>If you want users to be able to set no package, pass <code>nullable = true</code>.
In this mode a <code>default = null</code> will not be interpreted as no default and is interpreted literally.</p>
<p><code>pkgs</code></p>
<p>: Package set (an instantiation of nixpkgs such as pkgs in modules or another package set)</p>
<p><code>name</code></p>
<p>: Name for the package, shown in option description</p>
<p>structured function argument</p>
<p>: <code>nullable</code></p>
<p>: Whether the package can be null, for example to disable installing a package altogether (defaults to false)</p>
<p><code>default</code></p>
<p>: The attribute path where the default package is located (may be omitted, in which case it is copied from <code>name</code>)</p>
<p><code>example</code></p>
<p>: A string or an attribute path to use as an example (may be omitted)</p>
<p><code>extraDescription</code></p>
<p>: Additional text to include in the option description (may be omitted)</p>
<p><code>pkgsText</code></p>
<p>: Representation of the package set passed as pkgs (defaults to <code>"pkgs"</code>)</p>
<div class="admonition example">
<p class="admonition-title">Example</p>
<h1 id="liboptionsmkpackageoption-usage-example"><code>lib.options.mkPackageOption</code> usage example</h1>
</div>
<div class="highlight"><pre><span></span><code>mkPackageOption pkgs <span class="s2">&quot;hello&quot;</span> <span class="p">{</span> <span class="p">}</span>
<span class="o">=&gt;</span> <span class="p">{</span> <span class="o">...</span><span class="p">;</span> <span class="ss">default</span> <span class="o">=</span> pkgs<span class="o">.</span>hello<span class="p">;</span> <span class="ss">defaultText</span> <span class="o">=</span> literalExpression <span class="s2">&quot;pkgs.hello&quot;</span><span class="p">;</span> <span class="ss">description</span> <span class="o">=</span> <span class="s2">&quot;The hello package to use.&quot;</span><span class="p">;</span> <span class="ss">type</span> <span class="o">=</span> package<span class="p">;</span> <span class="p">}</span>
mkPackageOption pkgs <span class="s2">&quot;GHC&quot;</span> <span class="p">{</span>
<span class="ss">default</span> <span class="o">=</span> <span class="p">[</span> <span class="s2">&quot;ghc&quot;</span> <span class="p">];</span>
<span class="ss">example</span> <span class="o">=</span> <span class="s2">&quot;pkgs.haskell.packages.ghc92.ghc.withPackages (hkgs: [ hkgs.primes ])&quot;</span><span class="p">;</span>
<span class="p">}</span>
<span class="o">=&gt;</span> <span class="p">{</span> <span class="o">...</span><span class="p">;</span> <span class="ss">default</span> <span class="o">=</span> pkgs<span class="o">.</span>ghc<span class="p">;</span> <span class="ss">defaultText</span> <span class="o">=</span> literalExpression <span class="s2">&quot;pkgs.ghc&quot;</span><span class="p">;</span> <span class="ss">description</span> <span class="o">=</span> <span class="s2">&quot;The GHC package to use.&quot;</span><span class="p">;</span> <span class="ss">example</span> <span class="o">=</span> literalExpression <span class="s2">&quot;pkgs.haskell.packages.ghc92.ghc.withPackages (hkgs: [ hkgs.primes ])&quot;</span><span class="p">;</span> <span class="ss">type</span> <span class="o">=</span> package<span class="p">;</span> <span class="p">}</span>
mkPackageOption pkgs <span class="p">[</span> <span class="s2">&quot;python3Packages&quot;</span> <span class="s2">&quot;pytorch&quot;</span> <span class="p">]</span> <span class="p">{</span>
<span class="ss">extraDescription</span> <span class="o">=</span> <span class="s2">&quot;This is an example and doesn&#39;t actually do anything.&quot;</span><span class="p">;</span>
<span class="p">}</span>
<span class="o">=&gt;</span> <span class="p">{</span> <span class="o">...</span><span class="p">;</span> <span class="ss">default</span> <span class="o">=</span> pkgs<span class="o">.</span>python3Packages<span class="o">.</span>pytorch<span class="p">;</span> <span class="ss">defaultText</span> <span class="o">=</span> literalExpression <span class="s2">&quot;pkgs.python3Packages.pytorch&quot;</span><span class="p">;</span> <span class="ss">description</span> <span class="o">=</span> <span class="s2">&quot;The pytorch package to use. This is an example and doesn&#39;t actually do anything.&quot;</span><span class="p">;</span> <span class="ss">type</span> <span class="o">=</span> package<span class="p">;</span> <span class="p">}</span>
mkPackageOption pkgs <span class="s2">&quot;nushell&quot;</span> <span class="p">{</span>
<span class="ss">nullable</span> <span class="o">=</span> <span class="no">true</span><span class="p">;</span>
<span class="p">}</span>
<span class="o">=&gt;</span> <span class="p">{</span> <span class="o">...</span><span class="p">;</span> <span class="ss">default</span> <span class="o">=</span> pkgs<span class="o">.</span>nushell<span class="p">;</span> <span class="ss">defaultText</span> <span class="o">=</span> literalExpression <span class="s2">&quot;pkgs.nushell&quot;</span><span class="p">;</span> <span class="ss">description</span> <span class="o">=</span> <span class="s2">&quot;The nushell package to use.&quot;</span><span class="p">;</span> <span class="ss">type</span> <span class="o">=</span> nullOr package<span class="p">;</span> <span class="p">}</span>
mkPackageOption pkgs <span class="s2">&quot;coreutils&quot;</span> <span class="p">{</span>
<span class="ss">default</span> <span class="o">=</span> <span class="no">null</span><span class="p">;</span>
<span class="p">}</span>
<span class="o">=&gt;</span> <span class="p">{</span> <span class="o">...</span><span class="p">;</span> <span class="ss">description</span> <span class="o">=</span> <span class="s2">&quot;The coreutils package to use.&quot;</span><span class="p">;</span> <span class="ss">type</span> <span class="o">=</span> package<span class="p">;</span> <span class="p">}</span>
mkPackageOption pkgs <span class="s2">&quot;dbus&quot;</span> <span class="p">{</span>
<span class="ss">nullable</span> <span class="o">=</span> <span class="no">true</span><span class="p">;</span>
<span class="ss">default</span> <span class="o">=</span> <span class="no">null</span><span class="p">;</span>
<span class="p">}</span>
<span class="o">=&gt;</span> <span class="p">{</span> <span class="o">...</span><span class="p">;</span> <span class="ss">default</span> <span class="o">=</span> <span class="no">null</span><span class="p">;</span> <span class="ss">description</span> <span class="o">=</span> <span class="s2">&quot;The dbus package to use.&quot;</span><span class="p">;</span> <span class="ss">type</span> <span class="o">=</span> nullOr package<span class="p">;</span> <span class="p">}</span>
mkPackageOption pkgs<span class="o">.</span>javaPackages <span class="s2">&quot;OpenJFX&quot;</span> <span class="p">{</span>
<span class="ss">default</span> <span class="o">=</span> <span class="s2">&quot;openjfx20&quot;</span><span class="p">;</span>
<span class="ss">pkgsText</span> <span class="o">=</span> <span class="s2">&quot;pkgs.javaPackages&quot;</span><span class="p">;</span>
<span class="p">}</span>
<span class="o">=&gt;</span> <span class="p">{</span> <span class="o">...</span><span class="p">;</span> <span class="ss">default</span> <span class="o">=</span> pkgs<span class="o">.</span>javaPackages<span class="o">.</span>openjfx20<span class="p">;</span> <span class="ss">defaultText</span> <span class="o">=</span> literalExpression <span class="s2">&quot;pkgs.javaPackages.openjfx20&quot;</span><span class="p">;</span> <span class="ss">description</span> <span class="o">=</span> <span class="s2">&quot;The OpenJFX package to use.&quot;</span><span class="p">;</span> <span class="ss">type</span> <span class="o">=</span> package<span class="p">;</span> <span class="p">}</span>
</code></pre></div>
<p>Located at <a href="https://github.com/NixOS/nixpkgs/blob/master/lib/options.nix#L185">lib/options.nix:185</a> in <code>&lt;nixpkgs&gt;</code>.</p>
<h2 id="function-library-lib.options.mkPackageOptionMD"><code>lib.options.mkPackageOptionMD</code></h2>
<p>Deprecated alias of mkPackageOption, to be removed in 25.05.
Previously used to create options with markdown documentation, which is no longer required.</p>
<p>Located at <a href="https://github.com/NixOS/nixpkgs/blob/master/lib/options.nix#L226">lib/options.nix:226</a> in <code>&lt;nixpkgs&gt;</code>.</p>
<h2 id="function-library-lib.options.mkSinkUndeclaredOptions"><code>lib.options.mkSinkUndeclaredOptions</code></h2>
<p>This option accepts anything, but it does not produce any result.</p>
<p>This is useful for sharing a module across different module sets
without having to implement similar features as long as the
values of the options are not accessed.</p>
<p><code>attrs</code></p>
<p>: Function argument</p>
<p>Located at <a href="https://github.com/NixOS/nixpkgs/blob/master/lib/options.nix#L233">lib/options.nix:233</a> in <code>&lt;nixpkgs&gt;</code>.</p>
<h2 id="function-library-lib.options.mergeOneOption"><code>lib.options.mergeOneOption</code></h2>
<p>Require a single definition.</p>
<p>WARNING: Does not perform nested checks, as this does not run the merge function!</p>
<p>Located at <a href="https://github.com/NixOS/nixpkgs/blob/master/lib/options.nix#L262">lib/options.nix:262</a> in <code>&lt;nixpkgs&gt;</code>.</p>
<h2 id="function-library-lib.options.mergeUniqueOption"><code>lib.options.mergeUniqueOption</code></h2>
<p>Require a single definition.</p>
<p>NOTE: When the type is not checked completely by check, pass a merge function for further checking (of sub-attributes, etc).</p>
<p>structured function argument</p>
<p>: <code>message</code></p>
<p>: Function argument</p>
<p><code>merge</code></p>
<p>: WARNING: the default merge function assumes that the definition is a valid (option) value. You MUST pass a merge function if the return value needs to be - type checked beyond what .check does (which should be very litte; only on the value head; not attribute values, etc) - if you want attribute values to be checked, or list items - if you want coercedTo-like behavior to work</p>
<p><code>loc</code></p>
<p>: Function argument</p>
<p><code>defs</code></p>
<p>: Function argument</p>
<p>Located at <a href="https://github.com/NixOS/nixpkgs/blob/master/lib/options.nix#L269">lib/options.nix:269</a> in <code>&lt;nixpkgs&gt;</code>.</p>
<h2 id="function-library-lib.options.mergeEqualOption"><code>lib.options.mergeEqualOption</code></h2>
<p>"Merge" option definitions by checking that they all have the same value.</p>
<p><code>loc</code></p>
<p>: Function argument</p>
<p><code>defs</code></p>
<p>: Function argument</p>
<p>Located at <a href="https://github.com/NixOS/nixpkgs/blob/master/lib/options.nix#L284">lib/options.nix:284</a> in <code>&lt;nixpkgs&gt;</code>.</p>
<h2 id="function-library-lib.options.getValues"><code>lib.options.getValues</code></h2>
<p><strong>Type</strong>: <code>getValues :: [ { value :: a; } ] -&gt; [a]</code></p>
<p>Extracts values of all "value" keys of the given list.</p>
<div class="admonition example">
<p class="admonition-title">Example</p>
<div class="highlight"><pre><span></span><code># `lib.options.getValues` usage example
</code></pre></div>
<div class="highlight"><pre><span></span><code>getValues <span class="p">[</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> <span class="ss">value</span> <span class="o">=</span> <span class="mi">2</span><span class="p">;</span> <span class="p">}</span> <span class="p">]</span> <span class="o">//</span> <span class="o">=&gt;</span> <span class="p">[</span> <span class="mi">1</span> <span class="mi">2</span> <span class="p">]</span>
getValues <span class="p">[</span> <span class="p">]</span> <span class="o">//</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/options.nix#L304">lib/options.nix:304</a> in <code>&lt;nixpkgs&gt;</code>.</p>
<h2 id="function-library-lib.options.getFiles"><code>lib.options.getFiles</code></h2>
<p><strong>Type</strong>: <code>getFiles :: [ { file :: a; } ] -&gt; [a]</code></p>
<p>Extracts values of all "file" keys of the given list</p>
<div class="admonition example">
<p class="admonition-title">Example</p>
<div class="highlight"><pre><span></span><code># `lib.options.getFiles` usage example
</code></pre></div>
<div class="highlight"><pre><span></span><code>getFiles <span class="p">[</span> <span class="p">{</span> <span class="ss">file</span> <span class="o">=</span> <span class="s2">&quot;file1&quot;</span><span class="p">;</span> <span class="p">}</span> <span class="p">{</span> <span class="ss">file</span> <span class="o">=</span> <span class="s2">&quot;file2&quot;</span><span class="p">;</span> <span class="p">}</span> <span class="p">]</span> <span class="o">//</span> <span class="o">=&gt;</span> <span class="p">[</span> <span class="s2">&quot;file1&quot;</span> <span class="s2">&quot;file2&quot;</span> <span class="p">]</span>
getFiles <span class="p">[</span> <span class="p">]</span> <span class="o">//</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/options.nix#L314">lib/options.nix:314</a> in <code>&lt;nixpkgs&gt;</code>.</p>
<h2 id="function-library-lib.options.scrubOptionValue"><code>lib.options.scrubOptionValue</code></h2>
<p>This function recursively removes all derivation attributes from
<code>x</code> except for the <code>name</code> attribute.</p>
<p>This is to make the generation of <code>options.xml</code> much more
efficient: the XML representation of derivations is very large
(on the order of megabytes) and is not actually used by the
manual generator.</p>
<p>This function was made obsolete by renderOptionValue and is kept for
compatibility with out-of-tree code.</p>
<p><code>x</code></p>
<p>: Function argument</p>
<p>Located at <a href="https://github.com/NixOS/nixpkgs/blob/master/lib/options.nix#L372">lib/options.nix:372</a> in <code>&lt;nixpkgs&gt;</code>.</p>
<h2 id="function-library-lib.options.renderOptionValue"><code>lib.options.renderOptionValue</code></h2>
<p>Ensures that the given option value (default or example) is a <code>_type</code>d string
by rendering Nix values to <code>literalExpression</code>s.</p>
<p><code>v</code></p>
<p>: Function argument</p>
<p>Located at <a href="https://github.com/NixOS/nixpkgs/blob/master/lib/options.nix#L383">lib/options.nix:383</a> in <code>&lt;nixpkgs&gt;</code>.</p>
<h2 id="function-library-lib.options.literalExpression"><code>lib.options.literalExpression</code></h2>
<p>For use in the <code>defaultText</code> and <code>example</code> option attributes. Causes the
given string to be rendered verbatim in the documentation as Nix code. This
is necessary for complex values, e.g. functions, or values that depend on
other values or packages.</p>
<p><code>text</code></p>
<p>: Function argument</p>
<p>Located at <a href="https://github.com/NixOS/nixpkgs/blob/master/lib/options.nix#L396">lib/options.nix:396</a> in <code>&lt;nixpkgs&gt;</code>.</p>
<h2 id="function-library-lib.options.mdDoc"><code>lib.options.mdDoc</code></h2>
<p>Transition marker for documentation that's already migrated to markdown
syntax. Has been a no-op for some while and been removed from nixpkgs.
Kept here to alert downstream users who may not be aware of the migration's
completion that it should be removed from modules.</p>
<p>Located at <a href="https://github.com/NixOS/nixpkgs/blob/master/lib/options.nix#L407">lib/options.nix:407</a> in <code>&lt;nixpkgs&gt;</code>.</p>
<h2 id="function-library-lib.options.literalMD"><code>lib.options.literalMD</code></h2>
<p>For use in the <code>defaultText</code> and <code>example</code> option attributes. Causes the
given MD text to be inserted verbatim in the documentation, for when
a <code>literalExpression</code> would be too hard to read.</p>
<p><code>text</code></p>
<p>: Function argument</p>
<p>Located at <a href="https://github.com/NixOS/nixpkgs/blob/master/lib/options.nix#L413">lib/options.nix:413</a> in <code>&lt;nixpkgs&gt;</code>.</p>
<h2 id="function-library-lib.options.showOption"><code>lib.options.showOption</code></h2>
<p>Convert an option, described as a list of the option parts to a
human-readable version.</p>
<p><code>parts</code></p>
<p>: Function argument</p>
<div class="admonition example">
<p class="admonition-title">Example</p>
<h1 id="liboptionsshowoption-usage-example"><code>lib.options.showOption</code> usage example</h1>
</div>
<div class="highlight"><pre><span></span><code><span class="p">(</span>showOption <span class="p">[</span><span class="s2">&quot;foo&quot;</span> <span class="s2">&quot;bar&quot;</span> <span class="s2">&quot;baz&quot;</span><span class="p">])</span> <span class="o">==</span> <span class="s2">&quot;foo.bar.baz&quot;</span>
<span class="p">(</span>showOption <span class="p">[</span><span class="s2">&quot;foo&quot;</span> <span class="s2">&quot;bar.baz&quot;</span> <span class="s2">&quot;tux&quot;</span><span class="p">])</span> <span class="o">==</span> <span class="s2">&quot;foo.</span><span class="se">\&quot;</span><span class="s2">bar.baz</span><span class="se">\&quot;</span><span class="s2">.tux&quot;</span>
<span class="p">(</span>showOption <span class="p">[</span><span class="s2">&quot;windowManager&quot;</span> <span class="s2">&quot;2bwm&quot;</span> <span class="s2">&quot;enable&quot;</span><span class="p">])</span> <span class="o">==</span> <span class="s2">&quot;windowManager.</span><span class="se">\&quot;</span><span class="s2">2bwm</span><span class="se">\&quot;</span><span class="s2">.enable&quot;</span>
Placeholders will not be quoted as they are not actual values<span class="p">:</span>
<span class="p">(</span>showOption <span class="p">[</span><span class="s2">&quot;foo&quot;</span> <span class="s2">&quot;*&quot;</span> <span class="s2">&quot;bar&quot;</span><span class="p">])</span> <span class="o">==</span> <span class="s2">&quot;foo.*.bar&quot;</span>
<span class="p">(</span>showOption <span class="p">[</span><span class="s2">&quot;foo&quot;</span> <span class="s2">&quot;&lt;name&gt;&quot;</span> <span class="s2">&quot;bar&quot;</span><span class="p">])</span> <span class="o">==</span> <span class="s2">&quot;foo.&lt;name&gt;.bar&quot;</span>
</code></pre></div>
<p>Located at <a href="https://github.com/NixOS/nixpkgs/blob/master/lib/options.nix#L431">lib/options.nix:431</a> in <code>&lt;nixpkgs&gt;</code>.</p>
</article>
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