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Merge pull request #2464 from Profpatsch/docs-builtins-add-ids

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manual: add XML IDs to all builtin list entries
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Eelco Dolstra 2018-10-02 15:45:59 +02:00 committed by GitHub
parent aa5e47b2f4 05cfc71cab
commit d93db0ace0
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1 changed files with 217 additions and 147 deletions
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doc/manual/expressions/builtins.xml
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@ -21,7 +21,8 @@ available as <function>builtins.derivation</function>.</para>
<variablelist> <variablelist>
<varlistentry><term><function>abort</function> <replaceable>s</replaceable></term> <varlistentry xml:id='builtin-abort'>
<term><function>abort</function> <replaceable>s</replaceable></term>
<listitem><para>Abort Nix expression evaluation, print error <listitem><para>Abort Nix expression evaluation, print error
message <replaceable>s</replaceable>.</para></listitem> message <replaceable>s</replaceable>.</para></listitem>
@ -29,8 +30,10 @@ available as <function>builtins.derivation</function>.</para>
</varlistentry> </varlistentry>
<varlistentry><term><function>builtins.add</function> <varlistentry xml:id='builtin-add'>
<replaceable>e1</replaceable> <replaceable>e2</replaceable></term> <term><function>builtins.add</function>
<replaceable>e1</replaceable> <replaceable>e2</replaceable>
</term>
<listitem><para>Return the sum of the numbers <listitem><para>Return the sum of the numbers
<replaceable>e1</replaceable> and <replaceable>e1</replaceable> and
@ -39,8 +42,9 @@ available as <function>builtins.derivation</function>.</para>
</varlistentry> </varlistentry>
<varlistentry><term><function>builtins.all</function> <varlistentry xml:id='builtin-all'>
<replaceable>pred</replaceable> <replaceable>list</replaceable></term> <term><function>builtins.all</function>
<replaceable>pred</replaceable> <replaceable>list</replaceable></term>
<listitem><para>Return <literal>true</literal> if the function <listitem><para>Return <literal>true</literal> if the function
<replaceable>pred</replaceable> returns <literal>true</literal> <replaceable>pred</replaceable> returns <literal>true</literal>
@ -50,8 +54,9 @@ available as <function>builtins.derivation</function>.</para>
</varlistentry> </varlistentry>
<varlistentry><term><function>builtins.any</function> <varlistentry xml:id='builtin-any'>
<replaceable>pred</replaceable> <replaceable>list</replaceable></term> <term><function>builtins.any</function>
<replaceable>pred</replaceable> <replaceable>list</replaceable></term>
<listitem><para>Return <literal>true</literal> if the function <listitem><para>Return <literal>true</literal> if the function
<replaceable>pred</replaceable> returns <literal>true</literal> <replaceable>pred</replaceable> returns <literal>true</literal>
@ -61,8 +66,9 @@ available as <function>builtins.derivation</function>.</para>
</varlistentry> </varlistentry>
<varlistentry><term><function>builtins.attrNames</function> <varlistentry xml:id='builtin-attrNames'>
<replaceable>set</replaceable></term> <term><function>builtins.attrNames</function>
<replaceable>set</replaceable></term>
<listitem><para>Return the names of the attributes in the set <listitem><para>Return the names of the attributes in the set
<replaceable>set</replaceable> in an alphabetically sorted list. For instance, <replaceable>set</replaceable> in an alphabetically sorted list. For instance,
@ -72,8 +78,9 @@ available as <function>builtins.derivation</function>.</para>
</varlistentry> </varlistentry>
<varlistentry><term><function>builtins.attrValues</function> <varlistentry xml:id='builtin-attrValues'>
<replaceable>set</replaceable></term> <term><function>builtins.attrValues</function>
<replaceable>set</replaceable></term>
<listitem><para>Return the values of the attributes in the set <listitem><para>Return the values of the attributes in the set
<replaceable>set</replaceable> in the order corresponding to the <replaceable>set</replaceable> in the order corresponding to the
@ -82,7 +89,8 @@ available as <function>builtins.derivation</function>.</para>
</varlistentry> </varlistentry>
<varlistentry><term><function>baseNameOf</function> <replaceable>s</replaceable></term> <varlistentry xml:id='builtin-baseNameOf'>
<term><function>baseNameOf</function> <replaceable>s</replaceable></term>
<listitem><para>Return the <emphasis>base name</emphasis> of the <listitem><para>Return the <emphasis>base name</emphasis> of the
string <replaceable>s</replaceable>, that is, everything following string <replaceable>s</replaceable>, that is, everything following
@ -92,8 +100,9 @@ available as <function>builtins.derivation</function>.</para>
</varlistentry> </varlistentry>
<varlistentry><term><function>builtins.bitAnd</function> <varlistentry xml:id='builtin-bitAnd'>
<replaceable>e1</replaceable> <replaceable>e2</replaceable></term> <term><function>builtins.bitAnd</function>
<replaceable>e1</replaceable> <replaceable>e2</replaceable></term>
<listitem><para>Return the bitwise AND of the integers <listitem><para>Return the bitwise AND of the integers
<replaceable>e1</replaceable> and <replaceable>e1</replaceable> and
@ -102,8 +111,9 @@ available as <function>builtins.derivation</function>.</para>
</varlistentry> </varlistentry>
<varlistentry><term><function>builtins.bitOr</function> <varlistentry xml:id='builtin-bitOr'>
<replaceable>e1</replaceable> <replaceable>e2</replaceable></term> <term><function>builtins.bitOr</function>
<replaceable>e1</replaceable> <replaceable>e2</replaceable></term>
<listitem><para>Return the bitwise OR of the integers <listitem><para>Return the bitwise OR of the integers
<replaceable>e1</replaceable> and <replaceable>e1</replaceable> and
@ -112,8 +122,9 @@ available as <function>builtins.derivation</function>.</para>
</varlistentry> </varlistentry>
<varlistentry><term><function>builtins.bitXor</function> <varlistentry xml:id='builtin-bitXor'>
<replaceable>e1</replaceable> <replaceable>e2</replaceable></term> <term><function>builtins.bitXor</function>
<replaceable>e1</replaceable> <replaceable>e2</replaceable></term>
<listitem><para>Return the bitwise XOR of the integers <listitem><para>Return the bitwise XOR of the integers
<replaceable>e1</replaceable> and <replaceable>e1</replaceable> and
@ -122,7 +133,8 @@ available as <function>builtins.derivation</function>.</para>
</varlistentry> </varlistentry>
<varlistentry><term><varname>builtins</varname></term> <varlistentry xml:id='builtin-builtins'>
<term><varname>builtins</varname></term>
<listitem><para>The set <varname>builtins</varname> contains all <listitem><para>The set <varname>builtins</varname> contains all
the built-in functions and values. You can use the built-in functions and values. You can use
@ -139,8 +151,9 @@ if builtins ? getEnv then builtins.getEnv "PATH" else ""</programlisting>
</varlistentry> </varlistentry>
<varlistentry><term><function>builtins.compareVersions</function> <varlistentry xml:id='builtin-compareVersions'>
<replaceable>s1</replaceable> <replaceable>s2</replaceable></term> <term><function>builtins.compareVersions</function>
<replaceable>s1</replaceable> <replaceable>s2</replaceable></term>
<listitem><para>Compare two strings representing versions and <listitem><para>Compare two strings representing versions and
return <literal>-1</literal> if version return <literal>-1</literal> if version
@ -156,8 +169,9 @@ if builtins ? getEnv then builtins.getEnv "PATH" else ""</programlisting>
</varlistentry> </varlistentry>
<varlistentry><term><function>builtins.splitVersion</function> <varlistentry xml:id='builtin-splitVersion'>
<replaceable>s</replaceable></term> <term><function>builtins.splitVersion</function>
<replaceable>s</replaceable></term>
<listitem><para>Split a string representing a version into its <listitem><para>Split a string representing a version into its
components, by the same version splitting logic underlying the components, by the same version splitting logic underlying the
@ -167,16 +181,18 @@ if builtins ? getEnv then builtins.getEnv "PATH" else ""</programlisting>
</varlistentry> </varlistentry>
<varlistentry><term><function>builtins.concatLists</function> <varlistentry xml:id='builtin-concatLists'>
<replaceable>lists</replaceable></term> <term><function>builtins.concatLists</function>
<replaceable>lists</replaceable></term>
<listitem><para>Concatenate a list of lists into a single <listitem><para>Concatenate a list of lists into a single
list.</para></listitem> list.</para></listitem>
</varlistentry> </varlistentry>
<varlistentry><term><function>builtins.concatStringsSep</function> <varlistentry xml:id='builtin-concatStringsSep'>
<replaceable>separator</replaceable> <replaceable>list</replaceable></term> <term><function>builtins.concatStringsSep</function>
<replaceable>separator</replaceable> <replaceable>list</replaceable></term>
<listitem><para>Concatenate a list of strings with a separator <listitem><para>Concatenate a list of strings with a separator
between each element, e.g. <literal>concatStringsSep "/" between each element, e.g. <literal>concatStringsSep "/"
@ -184,8 +200,8 @@ if builtins ? getEnv then builtins.getEnv "PATH" else ""</programlisting>
</varlistentry> </varlistentry>
<varlistentry <varlistentry xml:id='builtin-currentSystem'>
xml:id='builtin-currentSystem'><term><varname>builtins.currentSystem</varname></term> <term><varname>builtins.currentSystem</varname></term>
<listitem><para>The built-in value <varname>currentSystem</varname> <listitem><para>The built-in value <varname>currentSystem</varname>
evaluates to the Nix platform identifier for the Nix installation evaluates to the Nix platform identifier for the Nix installation
@ -218,8 +234,9 @@ if builtins ? getEnv then builtins.getEnv "PATH" else ""</programlisting>
--> -->
<varlistentry><term><function>builtins.deepSeq</function> <varlistentry xml:id='builtin-deepSeq'>
<replaceable>e1</replaceable> <replaceable>e2</replaceable></term> <term><function>builtins.deepSeq</function>
<replaceable>e1</replaceable> <replaceable>e2</replaceable></term>
<listitem><para>This is like <literal>seq <listitem><para>This is like <literal>seq
<replaceable>e1</replaceable> <replaceable>e1</replaceable>
@ -231,8 +248,9 @@ if builtins ? getEnv then builtins.getEnv "PATH" else ""</programlisting>
</varlistentry> </varlistentry>
<varlistentry><term><function>derivation</function> <varlistentry xml:id='builtin-derivation'>
<replaceable>attrs</replaceable></term> <term><function>derivation</function>
<replaceable>attrs</replaceable></term>
<listitem><para><function>derivation</function> is described in <listitem><para><function>derivation</function> is described in
<xref linkend='ssec-derivation' />.</para></listitem> <xref linkend='ssec-derivation' />.</para></listitem>
@ -240,7 +258,8 @@ if builtins ? getEnv then builtins.getEnv "PATH" else ""</programlisting>
</varlistentry> </varlistentry>
<varlistentry><term><function>dirOf</function> <replaceable>s</replaceable></term> <varlistentry xml:id='builtin-dirOf'>
<term><function>dirOf</function> <replaceable>s</replaceable></term>
<listitem><para>Return the directory part of the string <listitem><para>Return the directory part of the string
<replaceable>s</replaceable>, that is, everything before the final <replaceable>s</replaceable>, that is, everything before the final
@ -250,8 +269,9 @@ if builtins ? getEnv then builtins.getEnv "PATH" else ""</programlisting>
</varlistentry> </varlistentry>
<varlistentry><term><function>builtins.div</function> <varlistentry xml:id='builtin-div'>
<replaceable>e1</replaceable> <replaceable>e2</replaceable></term> <term><function>builtins.div</function>
<replaceable>e1</replaceable> <replaceable>e2</replaceable></term>
<listitem><para>Return the quotient of the numbers <listitem><para>Return the quotient of the numbers
<replaceable>e1</replaceable> and <replaceable>e1</replaceable> and
@ -259,8 +279,9 @@ if builtins ? getEnv then builtins.getEnv "PATH" else ""</programlisting>
</varlistentry> </varlistentry>
<varlistentry><term><function>builtins.elem</function> <varlistentry xml:id='builtin-elem'>
<replaceable>x</replaceable> <replaceable>xs</replaceable></term> <term><function>builtins.elem</function>
<replaceable>x</replaceable> <replaceable>xs</replaceable></term>
<listitem><para>Return <literal>true</literal> if a value equal to <listitem><para>Return <literal>true</literal> if a value equal to
<replaceable>x</replaceable> occurs in the list <replaceable>x</replaceable> occurs in the list
@ -270,8 +291,9 @@ if builtins ? getEnv then builtins.getEnv "PATH" else ""</programlisting>
</varlistentry> </varlistentry>
<varlistentry><term><function>builtins.elemAt</function> <varlistentry xml:id='builtin-elemAt'>
<replaceable>xs</replaceable> <replaceable>n</replaceable></term> <term><function>builtins.elemAt</function>
<replaceable>xs</replaceable> <replaceable>n</replaceable></term>
<listitem><para>Return element <replaceable>n</replaceable> from <listitem><para>Return element <replaceable>n</replaceable> from
the list <replaceable>xs</replaceable>. Elements are counted the list <replaceable>xs</replaceable>. Elements are counted
@ -281,8 +303,9 @@ if builtins ? getEnv then builtins.getEnv "PATH" else ""</programlisting>
</varlistentry> </varlistentry>
<varlistentry><term><function>builtins.fetchurl</function> <varlistentry xml:id='builtin-fetchurl'>
<replaceable>url</replaceable></term> <term><function>builtins.fetchurl</function>
<replaceable>url</replaceable></term>
<listitem><para>Download the specified URL and return the path of <listitem><para>Download the specified URL and return the path of
the downloaded file. This function is not available if <link the downloaded file. This function is not available if <link
@ -292,8 +315,9 @@ if builtins ? getEnv then builtins.getEnv "PATH" else ""</programlisting>
</varlistentry> </varlistentry>
<varlistentry><term><function>fetchTarball</function> <varlistentry xml:id='builtin-fetchTarball'>
<replaceable>url</replaceable></term> <term><function>fetchTarball</function>
<replaceable>url</replaceable></term>
<listitem><para>Download the specified URL, unpack it and return <listitem><para>Download the specified URL, unpack it and return
the path of the unpacked tree. The file must be a tape archive the path of the unpacked tree. The file must be a tape archive
@ -346,7 +370,7 @@ stdenv.mkDerivation { … }
</varlistentry> </varlistentry>
<varlistentry> <varlistentry xml:id='builtin-fetchGit'>
<term> <term>
<function>builtins.fetchGit</function> <function>builtins.fetchGit</function>
<replaceable>args</replaceable> <replaceable>args</replaceable>
@ -546,7 +570,8 @@ stdenv.mkDerivation {
</varlistentry> </varlistentry>
<varlistentry><term><function>builtins.foldl’</function> <varlistentry xml:id='builtin-foldl-prime'>
<term><function>builtins.foldl’</function>
<replaceable>op</replaceable> <replaceable>nul</replaceable> <replaceable>list</replaceable></term> <replaceable>op</replaceable> <replaceable>nul</replaceable> <replaceable>list</replaceable></term>
<listitem><para>Reduce a list by applying a binary operator, from <listitem><para>Reduce a list by applying a binary operator, from
@ -559,7 +584,8 @@ stdenv.mkDerivation {
</varlistentry> </varlistentry>
<varlistentry><term><function>builtins.functionArgs</function> <varlistentry xml:id='builtin-functionArgs'>
<term><function>builtins.functionArgs</function>
<replaceable>f</replaceable></term> <replaceable>f</replaceable></term>
<listitem><para> <listitem><para>
@ -577,7 +603,8 @@ stdenv.mkDerivation {
</varlistentry> </varlistentry>
<varlistentry><term><function>builtins.fromJSON</function> <replaceable>e</replaceable></term> <varlistentry xml:id='builtin-fromJSON'>
<term><function>builtins.fromJSON</function> <replaceable>e</replaceable></term>
<listitem><para>Convert a JSON string to a Nix <listitem><para>Convert a JSON string to a Nix
value. For example, value. For example,
@ -592,8 +619,9 @@ builtins.fromJSON ''{"x": [1, 2, 3], "y": null}''
</varlistentry> </varlistentry>
<varlistentry><term><function>builtins.genList</function> <varlistentry xml:id='builtin-genList'>
<replaceable>generator</replaceable> <replaceable>length</replaceable></term> <term><function>builtins.genList</function>
<replaceable>generator</replaceable> <replaceable>length</replaceable></term>
<listitem><para>Generate list of size <listitem><para>Generate list of size
<replaceable>length</replaceable>, with each element <replaceable>length</replaceable>, with each element
@ -610,8 +638,9 @@ builtins.genList (x: x * x) 5
</varlistentry> </varlistentry>
<varlistentry><term><function>builtins.getAttr</function> <varlistentry xml:id='builtin-getAttr'>
<replaceable>s</replaceable> <replaceable>set</replaceable></term> <term><function>builtins.getAttr</function>
<replaceable>s</replaceable> <replaceable>set</replaceable></term>
<listitem><para><function>getAttr</function> returns the attribute <listitem><para><function>getAttr</function> returns the attribute
named <replaceable>s</replaceable> from named <replaceable>s</replaceable> from
@ -623,8 +652,9 @@ builtins.genList (x: x * x) 5
</varlistentry> </varlistentry>
<varlistentry><term><function>builtins.getEnv</function> <varlistentry xml:id='builtin-getEnv'>
<replaceable>s</replaceable></term> <term><function>builtins.getEnv</function>
<replaceable>s</replaceable></term>
<listitem><para><function>getEnv</function> returns the value of <listitem><para><function>getEnv</function> returns the value of
the environment variable <replaceable>s</replaceable>, or an empty the environment variable <replaceable>s</replaceable>, or an empty
@ -641,8 +671,9 @@ builtins.genList (x: x * x) 5
</varlistentry> </varlistentry>
<varlistentry><term><function>builtins.hasAttr</function> <varlistentry xml:id='builtin-hasAttr'>
<replaceable>s</replaceable> <replaceable>set</replaceable></term> <term><function>builtins.hasAttr</function>
<replaceable>s</replaceable> <replaceable>set</replaceable></term>
<listitem><para><function>hasAttr</function> returns <listitem><para><function>hasAttr</function> returns
<literal>true</literal> if <replaceable>set</replaceable> has an <literal>true</literal> if <replaceable>set</replaceable> has an
@ -655,8 +686,9 @@ builtins.genList (x: x * x) 5
</varlistentry> </varlistentry>
<varlistentry><term><function>builtins.hashString</function> <varlistentry xml:id='builtin-hashString'>
<replaceable>type</replaceable> <replaceable>s</replaceable></term> <term><function>builtins.hashString</function>
<replaceable>type</replaceable> <replaceable>s</replaceable></term>
<listitem><para>Return a base-16 representation of the <listitem><para>Return a base-16 representation of the
cryptographic hash of string <replaceable>s</replaceable>. The cryptographic hash of string <replaceable>s</replaceable>. The
@ -667,8 +699,9 @@ builtins.genList (x: x * x) 5
</varlistentry> </varlistentry>
<varlistentry><term><function>builtins.head</function> <varlistentry xml:id='builtin-head'>
<replaceable>list</replaceable></term> <term><function>builtins.head</function>
<replaceable>list</replaceable></term>
<listitem><para>Return the first element of a list; abort <listitem><para>Return the first element of a list; abort
evaluation if the argument isn’t a list or is an empty list. You evaluation if the argument isn’t a list or is an empty list. You
@ -678,8 +711,9 @@ builtins.genList (x: x * x) 5
</varlistentry> </varlistentry>
<varlistentry><term><function>import</function> <varlistentry xml:id='builtin-import'>
<replaceable>path</replaceable></term> <term><function>import</function>
<replaceable>path</replaceable></term>
<listitem><para>Load, parse and return the Nix expression in the <listitem><para>Load, parse and return the Nix expression in the
file <replaceable>path</replaceable>. If <replaceable>path file <replaceable>path</replaceable>. If <replaceable>path
@ -733,8 +767,9 @@ x: x + 456</programlisting>
</varlistentry> </varlistentry>
<varlistentry><term><function>builtins.intersectAttrs</function> <varlistentry xml:id='builtin-intersectAttrs'>
<replaceable>e1</replaceable> <replaceable>e2</replaceable></term> <term><function>builtins.intersectAttrs</function>
<replaceable>e1</replaceable> <replaceable>e2</replaceable></term>
<listitem><para>Return a set consisting of the attributes in the <listitem><para>Return a set consisting of the attributes in the
set <replaceable>e2</replaceable> that also exist in the set set <replaceable>e2</replaceable> that also exist in the set
@ -743,8 +778,9 @@ x: x + 456</programlisting>
</varlistentry> </varlistentry>
<varlistentry><term><function>builtins.isAttrs</function> <varlistentry xml:id='builtin-isAttrs'>
<replaceable>e</replaceable></term> <term><function>builtins.isAttrs</function>
<replaceable>e</replaceable></term>
<listitem><para>Return <literal>true</literal> if <listitem><para>Return <literal>true</literal> if
<replaceable>e</replaceable> evaluates to a set, and <replaceable>e</replaceable> evaluates to a set, and
@ -753,8 +789,9 @@ x: x + 456</programlisting>
</varlistentry> </varlistentry>
<varlistentry><term><function>builtins.isList</function> <varlistentry xml:id='builtin-isList'>
<replaceable>e</replaceable></term> <term><function>builtins.isList</function>
<replaceable>e</replaceable></term>
<listitem><para>Return <literal>true</literal> if <listitem><para>Return <literal>true</literal> if
<replaceable>e</replaceable> evaluates to a list, and <replaceable>e</replaceable> evaluates to a list, and
@ -763,7 +800,7 @@ x: x + 456</programlisting>
</varlistentry> </varlistentry>
<varlistentry><term><function>builtins.isFunction</function> <varlistentry xml:id='builtin-isFunction'><term><function>builtins.isFunction</function>
<replaceable>e</replaceable></term> <replaceable>e</replaceable></term>
<listitem><para>Return <literal>true</literal> if <listitem><para>Return <literal>true</literal> if
@ -773,8 +810,9 @@ x: x + 456</programlisting>
</varlistentry> </varlistentry>
<varlistentry><term><function>builtins.isString</function> <varlistentry xml:id='builtin-isString'>
<replaceable>e</replaceable></term> <term><function>builtins.isString</function>
<replaceable>e</replaceable></term>
<listitem><para>Return <literal>true</literal> if <listitem><para>Return <literal>true</literal> if
<replaceable>e</replaceable> evaluates to a string, and <replaceable>e</replaceable> evaluates to a string, and
@ -783,8 +821,9 @@ x: x + 456</programlisting>
</varlistentry> </varlistentry>
<varlistentry><term><function>builtins.isInt</function> <varlistentry xml:id='builtin-isInt'>
<replaceable>e</replaceable></term> <term><function>builtins.isInt</function>
<replaceable>e</replaceable></term>
<listitem><para>Return <literal>true</literal> if <listitem><para>Return <literal>true</literal> if
<replaceable>e</replaceable> evaluates to an int, and <replaceable>e</replaceable> evaluates to an int, and
@ -793,8 +832,9 @@ x: x + 456</programlisting>
</varlistentry> </varlistentry>
<varlistentry><term><function>builtins.isFloat</function> <varlistentry xml:id='builtin-isFloat'>
<replaceable>e</replaceable></term> <term><function>builtins.isFloat</function>
<replaceable>e</replaceable></term>
<listitem><para>Return <literal>true</literal> if <listitem><para>Return <literal>true</literal> if
<replaceable>e</replaceable> evaluates to a float, and <replaceable>e</replaceable> evaluates to a float, and
@ -803,8 +843,9 @@ x: x + 456</programlisting>
</varlistentry> </varlistentry>
<varlistentry><term><function>builtins.isBool</function> <varlistentry xml:id='builtin-isBool'>
<replaceable>e</replaceable></term> <term><function>builtins.isBool</function>
<replaceable>e</replaceable></term>
<listitem><para>Return <literal>true</literal> if <listitem><para>Return <literal>true</literal> if
<replaceable>e</replaceable> evaluates to a bool, and <replaceable>e</replaceable> evaluates to a bool, and
@ -813,8 +854,9 @@ x: x + 456</programlisting>
</varlistentry> </varlistentry>
<varlistentry><term><function>isNull</function> <varlistentry xml:id='builtin-isNull'>
<replaceable>e</replaceable></term> <term><function>isNull</function>
<replaceable>e</replaceable></term>
<listitem><para>Return <literal>true</literal> if <listitem><para>Return <literal>true</literal> if
<replaceable>e</replaceable> evaluates to <literal>null</literal>, <replaceable>e</replaceable> evaluates to <literal>null</literal>,
@ -828,8 +870,9 @@ x: x + 456</programlisting>
</varlistentry> </varlistentry>
<varlistentry><term><function>builtins.length</function> <varlistentry xml:id='builtin-length'>
<replaceable>e</replaceable></term> <term><function>builtins.length</function>
<replaceable>e</replaceable></term>
<listitem><para>Return the length of the list <listitem><para>Return the length of the list
<replaceable>e</replaceable>.</para></listitem> <replaceable>e</replaceable>.</para></listitem>
@ -837,8 +880,9 @@ x: x + 456</programlisting>
</varlistentry> </varlistentry>
<varlistentry><term><function>builtins.lessThan</function> <varlistentry xml:id='builtin-lessThan'>
<replaceable>e1</replaceable> <replaceable>e2</replaceable></term> <term><function>builtins.lessThan</function>
<replaceable>e1</replaceable> <replaceable>e2</replaceable></term>
<listitem><para>Return <literal>true</literal> if the number <listitem><para>Return <literal>true</literal> if the number
<replaceable>e1</replaceable> is less than the number <replaceable>e1</replaceable> is less than the number
@ -850,8 +894,9 @@ x: x + 456</programlisting>
</varlistentry> </varlistentry>
<varlistentry><term><function>builtins.listToAttrs</function> <varlistentry xml:id='builtin-listToAttrs'>
<replaceable>e</replaceable></term> <term><function>builtins.listToAttrs</function>
<replaceable>e</replaceable></term>
<listitem><para>Construct a set from a list specifying the names <listitem><para>Construct a set from a list specifying the names
and values of each attribute. Each element of the list should be and values of each attribute. Each element of the list should be
@ -877,8 +922,9 @@ builtins.listToAttrs
</varlistentry> </varlistentry>
<varlistentry><term><function>map</function> <varlistentry xml:id='builtin-map'>
<replaceable>f</replaceable> <replaceable>list</replaceable></term> <term><function>map</function>
<replaceable>f</replaceable> <replaceable>list</replaceable></term>
<listitem><para>Apply the function <replaceable>f</replaceable> to <listitem><para>Apply the function <replaceable>f</replaceable> to
each element in the list <replaceable>list</replaceable>. For each element in the list <replaceable>list</replaceable>. For
@ -893,14 +939,15 @@ map (x: "foo" + x) [ "bar" "bla" "abc" ]</programlisting>
</varlistentry> </varlistentry>
<varlistentry><term><function>builtins.match</function> <varlistentry xml:id='builtin-match'>
<replaceable>regex</replaceable> <replaceable>str</replaceable></term> <term><function>builtins.match</function>
<replaceable>regex</replaceable> <replaceable>str</replaceable></term>
<listitem><para>Returns a list if the <link <listitem><para>Returns a list if the <link
xlink:href="http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap09.html#tag_09_04">extended xlink:href="http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap09.html#tag_09_04">extended
POSIX regular expression</link> <replaceable>regex</replaceable> POSIX regular expression</link> <replaceable>regex</replaceable>
matches <replaceable>str</replaceable> precisely, otherwise returns matches <replaceable>str</replaceable> precisely, otherwise returns
<literal>null</literal>. Each item in the list is a regex group. <literal>null</literal>. Each item in the list is a regex group.
<programlisting> <programlisting>
builtins.match "ab" "abc" builtins.match "ab" "abc"
@ -926,11 +973,12 @@ builtins.match "[[:space:]]+([[:upper:]]+)[[:space:]]+" " FOO "
Evaluates to <literal>[ "foo" ]</literal>. Evaluates to <literal>[ "foo" ]</literal>.
</para></listitem> </para></listitem>
</varlistentry> </varlistentry>
<varlistentry><term><function>builtins.mul</function> <varlistentry xml:id='builtin-mul'>
<replaceable>e1</replaceable> <replaceable>e2</replaceable></term> <term><function>builtins.mul</function>
<replaceable>e1</replaceable> <replaceable>e2</replaceable></term>
<listitem><para>Return the product of the numbers <listitem><para>Return the product of the numbers
<replaceable>e1</replaceable> and <replaceable>e1</replaceable> and
@ -939,8 +987,9 @@ Evaluates to <literal>[ "foo" ]</literal>.
</varlistentry> </varlistentry>
<varlistentry><term><function>builtins.parseDrvName</function> <varlistentry xml:id='builtin-parseDrvName'>
<replaceable>s</replaceable></term> <term><function>builtins.parseDrvName</function>
<replaceable>s</replaceable></term>
<listitem><para>Split the string <replaceable>s</replaceable> into <listitem><para>Split the string <replaceable>s</replaceable> into
a package name and version. The package name is everything up to a package name and version. The package name is everything up to
@ -953,7 +1002,7 @@ Evaluates to <literal>[ "foo" ]</literal>.
</varlistentry> </varlistentry>
<varlistentry> <varlistentry xml:id='builtin-path'>
<term> <term>
<function>builtins.path</function> <function>builtins.path</function>
<replaceable>args</replaceable> <replaceable>args</replaceable>
@ -1023,8 +1072,9 @@ Evaluates to <literal>[ "foo" ]</literal>.
</listitem> </listitem>
</varlistentry> </varlistentry>
<varlistentry><term><function>builtins.pathExists</function> <varlistentry xml:id='builtin-pathExists'>
<replaceable>path</replaceable></term> <term><function>builtins.pathExists</function>
<replaceable>path</replaceable></term>
<listitem><para>Return <literal>true</literal> if the path <listitem><para>Return <literal>true</literal> if the path
<replaceable>path</replaceable> exists, and <replaceable>path</replaceable> exists, and
@ -1047,8 +1097,9 @@ in config.someSetting</programlisting>
</varlistentry> </varlistentry>
<varlistentry><term><function>builtins.readDir</function> <varlistentry xml:id='builtin-readDir'>
<replaceable>path</replaceable></term> <term><function>builtins.readDir</function>
<replaceable>path</replaceable></term>
<listitem><para>Return the contents of the directory <listitem><para>Return the contents of the directory
<replaceable>path</replaceable> as a set mapping directory entries <replaceable>path</replaceable> as a set mapping directory entries
@ -1069,8 +1120,9 @@ in config.someSetting</programlisting>
</varlistentry> </varlistentry>
<varlistentry><term><function>builtins.readFile</function> <varlistentry xml:id='builtin-readFile'>
<replaceable>path</replaceable></term> <term><function>builtins.readFile</function>
<replaceable>path</replaceable></term>
<listitem><para>Return the contents of the file <listitem><para>Return the contents of the file
<replaceable>path</replaceable> as a string.</para></listitem> <replaceable>path</replaceable> as a string.</para></listitem>
@ -1078,8 +1130,9 @@ in config.someSetting</programlisting>
</varlistentry> </varlistentry>
<varlistentry><term><function>removeAttrs</function> <varlistentry xml:id='builtin-removeAttrs'>
<replaceable>set</replaceable> <replaceable>list</replaceable></term> <term><function>removeAttrs</function>
<replaceable>set</replaceable> <replaceable>list</replaceable></term>
<listitem><para>Remove the attributes listed in <listitem><para>Remove the attributes listed in
<replaceable>list</replaceable> from <replaceable>list</replaceable> from
@ -1094,8 +1147,9 @@ removeAttrs { x = 1; y = 2; z = 3; } [ "a" "x" "z" ]</programlisting>
</varlistentry> </varlistentry>
<varlistentry><term><function>builtins.replaceStrings</function> <varlistentry xml:id='builtin-replaceStrings'>
<replaceable>from</replaceable> <replaceable>to</replaceable> <replaceable>s</replaceable></term> <term><function>builtins.replaceStrings</function>
<replaceable>from</replaceable> <replaceable>to</replaceable> <replaceable>s</replaceable></term>
<listitem><para>Given string <replaceable>s</replaceable>, replace <listitem><para>Given string <replaceable>s</replaceable>, replace
every occurrence of the strings in <replaceable>from</replaceable> every occurrence of the strings in <replaceable>from</replaceable>
@ -1111,8 +1165,9 @@ builtins.replaceStrings ["oo" "a"] ["a" "i"] "foobar"
</varlistentry> </varlistentry>
<varlistentry><term><function>builtins.seq</function> <varlistentry xml:id='builtin-seq'>
<replaceable>e1</replaceable> <replaceable>e2</replaceable></term> <term><function>builtins.seq</function>
<replaceable>e1</replaceable> <replaceable>e2</replaceable></term>
<listitem><para>Evaluate <replaceable>e1</replaceable>, then <listitem><para>Evaluate <replaceable>e1</replaceable>, then
evaluate and return <replaceable>e2</replaceable>. This ensures evaluate and return <replaceable>e2</replaceable>. This ensures
@ -1122,8 +1177,9 @@ builtins.replaceStrings ["oo" "a"] ["a" "i"] "foobar"
</varlistentry> </varlistentry>
<varlistentry><term><function>builtins.sort</function> <varlistentry xml:id='builtin-sort'>
<replaceable>comparator</replaceable> <replaceable>list</replaceable></term> <term><function>builtins.sort</function>
<replaceable>comparator</replaceable> <replaceable>list</replaceable></term>
<listitem><para>Return <replaceable>list</replaceable> in sorted <listitem><para>Return <replaceable>list</replaceable> in sorted
order. It repeatedly calls the function order. It repeatedly calls the function
@ -1145,15 +1201,16 @@ builtins.sort builtins.lessThan [ 483 249 526 147 42 77 ]
</varlistentry> </varlistentry>
<varlistentry><term><function>builtins.split</function> <varlistentry xml:id='builtin-split'>
<replaceable>regex</replaceable> <replaceable>str</replaceable></term> <term><function>builtins.split</function>
<replaceable>regex</replaceable> <replaceable>str</replaceable></term>
<listitem><para>Returns a list composed of non matched strings interleaved <listitem><para>Returns a list composed of non matched strings interleaved
with the lists of the <link with the lists of the <link
xlink:href="http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap09.html#tag_09_04">extended xlink:href="http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap09.html#tag_09_04">extended
POSIX regular expression</link> <replaceable>regex</replaceable> matches POSIX regular expression</link> <replaceable>regex</replaceable> matches
of <replaceable>str</replaceable>. Each item in the lists of matched of <replaceable>str</replaceable>. Each item in the lists of matched
sequences is a regex group. sequences is a regex group.
<programlisting> <programlisting>
builtins.split "(a)b" "abc" builtins.split "(a)b" "abc"
@ -1179,11 +1236,12 @@ builtins.split "([[:upper:]]+)" " FOO "
Evaluates to <literal>[ " " [ "FOO" ] " " ]</literal>. Evaluates to <literal>[ " " [ "FOO" ] " " ]</literal>.
</para></listitem> </para></listitem>
</varlistentry> </varlistentry>
<varlistentry><term><function>builtins.stringLength</function> <varlistentry xml:id='builtin-stringLength'>
<replaceable>e</replaceable></term> <term><function>builtins.stringLength</function>
<replaceable>e</replaceable></term>
<listitem><para>Return the length of the string <listitem><para>Return the length of the string
<replaceable>e</replaceable>. If <replaceable>e</replaceable> is <replaceable>e</replaceable>. If <replaceable>e</replaceable> is
@ -1192,8 +1250,9 @@ Evaluates to <literal>[ " " [ "FOO" ] " " ]</literal>.
</varlistentry> </varlistentry>
<varlistentry><term><function>builtins.sub</function> <varlistentry xml:id='builtin-sub'>
<replaceable>e1</replaceable> <replaceable>e2</replaceable></term> <term><function>builtins.sub</function>
<replaceable>e1</replaceable> <replaceable>e2</replaceable></term>
<listitem><para>Return the difference between the numbers <listitem><para>Return the difference between the numbers
<replaceable>e1</replaceable> and <replaceable>e1</replaceable> and
@ -1202,9 +1261,10 @@ Evaluates to <literal>[ " " [ "FOO" ] " " ]</literal>.
</varlistentry> </varlistentry>
<varlistentry><term><function>builtins.substring</function> <varlistentry xml:id='builtin-substring'>
<replaceable>start</replaceable> <replaceable>len</replaceable> <term><function>builtins.substring</function>
<replaceable>s</replaceable></term> <replaceable>start</replaceable> <replaceable>len</replaceable>
<replaceable>s</replaceable></term>
<listitem><para>Return the substring of <listitem><para>Return the substring of
<replaceable>s</replaceable> from character position <replaceable>s</replaceable> from character position
@ -1227,8 +1287,9 @@ builtins.substring 0 3 "nixos"
</varlistentry> </varlistentry>
<varlistentry><term><function>builtins.tail</function> <varlistentry xml:id='builtin-tail'>
<replaceable>list</replaceable></term> <term><function>builtins.tail</function>
<replaceable>list</replaceable></term>
<listitem><para>Return the second to last elements of a list; <listitem><para>Return the second to last elements of a list;
abort evaluation if the argument isn’t a list or is an empty abort evaluation if the argument isn’t a list or is an empty
@ -1237,8 +1298,9 @@ builtins.substring 0 3 "nixos"
</varlistentry> </varlistentry>
<varlistentry><term><function>throw</function> <varlistentry xml:id='builtin-throw'>
<replaceable>s</replaceable></term> <term><function>throw</function>
<replaceable>s</replaceable></term>
<listitem><para>Throw an error message <listitem><para>Throw an error message
<replaceable>s</replaceable>. This usually aborts Nix expression <replaceable>s</replaceable>. This usually aborts Nix expression
@ -1251,9 +1313,10 @@ builtins.substring 0 3 "nixos"
</varlistentry> </varlistentry>
<varlistentry <varlistentry xml:id='builtin-toFile'>
xml:id='builtin-toFile'><term><function>builtins.toFile</function> <term><function>builtins.toFile</function>
<replaceable>name</replaceable> <replaceable>s</replaceable></term> <replaceable>name</replaceable>
<replaceable>s</replaceable></term>
<listitem><para>Store the string <replaceable>s</replaceable> in a <listitem><para>Store the string <replaceable>s</replaceable> in a
file in the Nix store and return its path. The file has suffix file in the Nix store and return its path. The file has suffix
@ -1329,7 +1392,8 @@ in foo</programlisting>
</varlistentry> </varlistentry>
<varlistentry><term><function>builtins.toJSON</function> <replaceable>e</replaceable></term> <varlistentry xml:id='builtin-toJSON'>
<term><function>builtins.toJSON</function> <replaceable>e</replaceable></term>
<listitem><para>Return a string containing a JSON representation <listitem><para>Return a string containing a JSON representation
of <replaceable>e</replaceable>. Strings, integers, floats, booleans, of <replaceable>e</replaceable>. Strings, integers, floats, booleans,
@ -1342,7 +1406,8 @@ in foo</programlisting>
</varlistentry> </varlistentry>
<varlistentry><term><function>builtins.toPath</function> <replaceable>s</replaceable></term> <varlistentry xml:id='builtin-toPath'>
<term><function>builtins.toPath</function> <replaceable>s</replaceable></term>
<listitem><para>Convert the string value <listitem><para>Convert the string value
<replaceable>s</replaceable> into a path value. The string <replaceable>s</replaceable> into a path value. The string
@ -1355,7 +1420,8 @@ in foo</programlisting>
</varlistentry> </varlistentry>
<varlistentry><term><function>toString</function> <replaceable>e</replaceable></term> <varlistentry xml:id='builtin-toString'>
<term><function>toString</function> <replaceable>e</replaceable></term>
<listitem><para>Convert the expression <listitem><para>Convert the expression
<replaceable>e</replaceable> to a string. <replaceable>e</replaceable> to a string.
@ -1374,7 +1440,8 @@ in foo</programlisting>
</varlistentry> </varlistentry>
<varlistentry xml:id='builtin-toXML'><term><function>builtins.toXML</function> <replaceable>e</replaceable></term> <varlistentry xml:id='builtin-toXML'>
<term><function>builtins.toXML</function> <replaceable>e</replaceable></term>
<listitem><para>Return a string containing an XML representation <listitem><para>Return a string containing an XML representation
of <replaceable>e</replaceable>. The main application for of <replaceable>e</replaceable>. The main application for
@ -1489,8 +1556,9 @@ stdenv.mkDerivation (rec {
</varlistentry> </varlistentry>
<varlistentry><term><function>builtins.trace</function> <varlistentry xml:id='builtin-trace'>
<replaceable>e1</replaceable> <replaceable>e2</replaceable></term> <term><function>builtins.trace</function>
<replaceable>e1</replaceable> <replaceable>e2</replaceable></term>
<listitem><para>Evaluate <replaceable>e1</replaceable> and print its <listitem><para>Evaluate <replaceable>e1</replaceable> and print its
abstract syntax representation on standard error. Then return abstract syntax representation on standard error. Then return
@ -1499,8 +1567,9 @@ stdenv.mkDerivation (rec {
</varlistentry> </varlistentry>
<varlistentry><term><function>builtins.tryEval</function> <varlistentry xml:id='builtin-tryEval'>
<replaceable>e</replaceable></term> <term><function>builtins.tryEval</function>
<replaceable>e</replaceable></term>
<listitem><para>Try to evaluate <replaceable>e</replaceable>. <listitem><para>Try to evaluate <replaceable>e</replaceable>.
Return a set containing the attributes <literal>success</literal> Return a set containing the attributes <literal>success</literal>
@ -1513,8 +1582,9 @@ stdenv.mkDerivation (rec {
</varlistentry> </varlistentry>
<varlistentry><term><function>builtins.typeOf</function> <varlistentry xml:id='builtin-typeOf'>
<replaceable>e</replaceable></term> <term><function>builtins.typeOf</function>
<replaceable>e</replaceable></term>
<listitem><para>Return a string representing the type of the value <listitem><para>Return a string representing the type of the value
<replaceable>e</replaceable>, namely <literal>"int"</literal>, <replaceable>e</replaceable>, namely <literal>"int"</literal>,