Document new primops
This commit is contained in:
Eelco Dolstra
parent
4387d19359
commit
094a08f839
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@ -19,7 +19,7 @@ is also available as <function>builtins.derivation</function>.</para>
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<variablelist>
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<varlistentry><term><function>abort</function> <replaceable>s</replaceable></term>
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<listitem><para>Abort Nix expression evaluation, print error
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@ -27,7 +27,7 @@ is also available as <function>builtins.derivation</function>.</para>
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</varlistentry>
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<varlistentry><term><function>builtins.add</function>
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<replaceable>e1</replaceable> <replaceable>e2</replaceable></term>
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@ -37,7 +37,7 @@ is also available as <function>builtins.derivation</function>.</para>
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</varlistentry>
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<varlistentry><term><function>builtins.attrNames</function>
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<replaceable>attrs</replaceable></term>
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@ -55,7 +55,7 @@ attrValues = attrs: map (name: builtins.getAttr name attrs) (builtins.attrNames
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</varlistentry>
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<varlistentry><term><function>baseNameOf</function> <replaceable>s</replaceable></term>
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<listitem><para>Return the <emphasis>base name</emphasis> of the
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@ -65,7 +65,7 @@ attrValues = attrs: map (name: builtins.getAttr name attrs) (builtins.attrNames
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</varlistentry>
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<varlistentry><term><varname>builtins</varname></term>
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<listitem><para>The attribute set <varname>builtins</varname>
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@ -82,7 +82,7 @@ if builtins ? getEnv then builtins.getEnv "PATH" else ""</programlisting>
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</varlistentry>
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<varlistentry><term><function>builtins.compareVersions</function>
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<replaceable>s1</replaceable> <replaceable>s2</replaceable></term>
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@ -99,7 +99,16 @@ if builtins ? getEnv then builtins.getEnv "PATH" else ""</programlisting>
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</varlistentry>
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<varlistentry><term><function>builtins.concatLists</function>
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<replaceable>lists</replaceable></term>
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<listitem><para>Concatenate a list of lists into a single
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list.</para></listitem>
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</varlistentry>
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<varlistentry
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xml:id='builtin-currentSystem'><term><varname>builtins.currentSystem</varname></term>
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@ -124,7 +133,7 @@ if builtins ? getEnv then builtins.getEnv "PATH" else ""</programlisting>
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</varlistentry>
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-->
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<!--
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<varlistentry><term><function>dependencyClosure</function></term>
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@ -133,7 +142,7 @@ if builtins ? getEnv then builtins.getEnv "PATH" else ""</programlisting>
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</varlistentry>
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-->
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<varlistentry><term><function>derivation</function>
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<replaceable>attrs</replaceable></term>
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@ -152,7 +161,7 @@ if builtins ? getEnv then builtins.getEnv "PATH" else ""</programlisting>
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</varlistentry>
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<varlistentry><term><function>builtins.div</function>
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<replaceable>e1</replaceable> <replaceable>e2</replaceable></term>
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@ -162,7 +171,40 @@ if builtins ? getEnv then builtins.getEnv "PATH" else ""</programlisting>
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</varlistentry>
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<varlistentry><term><function>builtins.elem</function>
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<replaceable>x</replaceable> <replaceable>xs</replaceable></term>
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<listitem><para>Return <literal>true</literal> if a value equal to
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<replaceable>x</replaceable> occurs in the list
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<replaceable>xs</replaceable>, and <literal>false</literal>
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otherwise.</para></listitem>
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</varlistentry>
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<varlistentry><term><function>builtins.elemAt</function>
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<replaceable>xs</replaceable> <replaceable>n</replaceable></term>
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<listitem><para>Return element <replaceable>n</replaceable> from
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the list <replaceable>xs</replaceable>. Elements are counted
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starting from 0. A fatal error occurs in the index is out of
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bounds.</para></listitem>
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</varlistentry>
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<varlistentry><term><function>builtins.filter</function>
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<replaceable>f</replaceable> <replaceable>xs</replaceable></term>
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<listitem><para>Return a list consisting of the elements of
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<replaceable>xs</replaceable> for which the function
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<replaceable>f</replaceable> returns
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<literal>true</literal>.</para></listitem>
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</varlistentry>
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<varlistentry><term><function>builtins.filterSource</function>
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<replaceable>e1</replaceable> <replaceable>e2</replaceable></term>
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@ -214,7 +256,7 @@ stdenv.mkDerivation {
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</varlistentry>
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<varlistentry><term><function>builtins.getAttr</function>
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<replaceable>s</replaceable> <replaceable>attrs</replaceable></term>
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@ -227,7 +269,7 @@ stdenv.mkDerivation {
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</varlistentry>
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<varlistentry><term><function>builtins.getEnv</function>
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<replaceable>s</replaceable></term>
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@ -245,7 +287,7 @@ stdenv.mkDerivation {
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</varlistentry>
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<varlistentry><term><function>builtins.hasAttr</function>
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<replaceable>s</replaceable> <replaceable>attrs</replaceable></term>
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@ -259,7 +301,7 @@ stdenv.mkDerivation {
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</varlistentry>
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<varlistentry><term><function>builtins.head</function>
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<replaceable>list</replaceable></term>
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@ -270,7 +312,7 @@ stdenv.mkDerivation {
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</varlistentry>
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<varlistentry><term><function>import</function>
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<replaceable>path</replaceable></term>
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@ -290,7 +332,7 @@ stdenv.mkDerivation {
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built-in). Therefore, it cannot refer to variables that are in
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scope at the call site. For instance, if you have a calling
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expression
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<programlisting>
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rec {
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x = 123;
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@ -325,7 +367,7 @@ x: x + 456</programlisting>
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</varlistentry>
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<varlistentry><term><function>builtins.intersectAttrs</function>
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<replaceable>e1</replaceable> <replaceable>e2</replaceable></term>
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@ -334,8 +376,8 @@ x: x + 456</programlisting>
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exist in the set <replaceable>e1</replaceable>.</para></listitem>
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</varlistentry>
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<varlistentry><term><function>builtins.isAttrs</function>
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<replaceable>e</replaceable></term>
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@ -345,7 +387,7 @@ x: x + 456</programlisting>
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</varlistentry>
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<varlistentry><term><function>builtins.isList</function>
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<replaceable>e</replaceable></term>
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@ -355,7 +397,7 @@ x: x + 456</programlisting>
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</varlistentry>
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<varlistentry><term><function>builtins.isFunction</function>
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<replaceable>e</replaceable></term>
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@ -365,7 +407,7 @@ x: x + 456</programlisting>
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</varlistentry>
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<varlistentry><term><function>builtins.isString</function>
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<replaceable>e</replaceable></term>
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@ -375,7 +417,7 @@ x: x + 456</programlisting>
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</varlistentry>
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<varlistentry><term><function>builtins.isInt</function>
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<replaceable>e</replaceable></term>
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@ -385,7 +427,7 @@ x: x + 456</programlisting>
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</varlistentry>
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<varlistentry><term><function>builtins.isBool</function>
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<replaceable>e</replaceable></term>
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@ -395,7 +437,7 @@ x: x + 456</programlisting>
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</varlistentry>
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<varlistentry><term><function>isNull</function>
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<replaceable>e</replaceable></term>
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@ -405,12 +447,12 @@ x: x + 456</programlisting>
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<warning><para>This function is <emphasis>deprecated</emphasis>;
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just write <literal>e == null</literal> instead.</para></warning>
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</listitem>
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</varlistentry>
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<varlistentry><term><function>builtins.length</function>
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<replaceable>e</replaceable></term>
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@ -419,7 +461,7 @@ x: x + 456</programlisting>
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</varlistentry>
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<varlistentry><term><function>builtins.lessThan</function>
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<replaceable>e1</replaceable> <replaceable>e2</replaceable></term>
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@ -432,7 +474,7 @@ x: x + 456</programlisting>
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</varlistentry>
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<varlistentry><term><function>builtins.listToAttrs</function>
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<replaceable>e</replaceable></term>
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@ -459,7 +501,7 @@ builtins.listToAttrs
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</para></listitem>
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</varlistentry>
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<varlistentry><term><function>map</function>
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<replaceable>f</replaceable> <replaceable>list</replaceable></term>
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@ -472,10 +514,10 @@ map (x: "foo" + x) [ "bar" "bla" "abc" ]</programlisting>
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evaluates to <literal>[ "foobar" "foobla" "fooabc"
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]</literal>.</para></listitem>
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</varlistentry>
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<varlistentry><term><function>builtins.mul</function>
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<replaceable>e1</replaceable> <replaceable>e2</replaceable></term>
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@ -485,7 +527,7 @@ map (x: "foo" + x) [ "bar" "bla" "abc" ]</programlisting>
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</varlistentry>
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<varlistentry><term><function>builtins.parseDrvName</function>
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<replaceable>s</replaceable></term>
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@ -500,7 +542,7 @@ map (x: "foo" + x) [ "bar" "bla" "abc" ]</programlisting>
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</varlistentry>
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<varlistentry><term><function>builtins.pathExists</function>
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<replaceable>path</replaceable></term>
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@ -533,7 +575,7 @@ in config.someSetting</programlisting>
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</varlistentry>
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-->
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<varlistentry><term><function>builtins.readFile</function>
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<replaceable>path</replaceable></term>
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@ -541,8 +583,8 @@ in config.someSetting</programlisting>
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<replaceable>path</replaceable> as a string.</para></listitem>
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</varlistentry>
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<varlistentry><term><function>removeAttrs</function>
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<replaceable>attrs</replaceable> <replaceable>list</replaceable></term>
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@ -558,7 +600,7 @@ removeAttrs { x = 1; y = 2; z = 3; } [ "a" "x" "z" ]</screen>
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</varlistentry>
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<varlistentry><term><function>builtins.stringLength</function>
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<replaceable>e</replaceable></term>
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@ -568,7 +610,7 @@ removeAttrs { x = 1; y = 2; z = 3; } [ "a" "x" "z" ]</screen>
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</varlistentry>
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<varlistentry><term><function>builtins.sub</function>
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<replaceable>e1</replaceable> <replaceable>e2</replaceable></term>
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@ -578,7 +620,7 @@ removeAttrs { x = 1; y = 2; z = 3; } [ "a" "x" "z" ]</screen>
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</varlistentry>
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<varlistentry><term><function>builtins.substring</function>
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<replaceable>start</replaceable> <replaceable>len</replaceable>
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<replaceable>s</replaceable></term>
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@ -596,7 +638,7 @@ removeAttrs { x = 1; y = 2; z = 3; } [ "a" "x" "z" ]</screen>
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</varlistentry>
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<varlistentry><term><function>builtins.tail</function>
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<replaceable>list</replaceable></term>
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@ -606,7 +648,7 @@ removeAttrs { x = 1; y = 2; z = 3; } [ "a" "x" "z" ]</screen>
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</varlistentry>
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<varlistentry><term><function>throw</function>
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<replaceable>s</replaceable></term>
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@ -620,7 +662,7 @@ removeAttrs { x = 1; y = 2; z = 3; } [ "a" "x" "z" ]</screen>
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</varlistentry>
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<varlistentry
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xml:id='builtin-toFile'><term><function>builtins.toFile</function>
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<replaceable>name</replaceable> <replaceable>s</replaceable></term>
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@ -638,7 +680,7 @@ removeAttrs { x = 1; y = 2; z = 3; } [ "a" "x" "z" ]</screen>
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stdenv.mkDerivation {
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name = "hello-2.1.1";
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builder = builtins.toFile "builder.sh" "
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source $stdenv/setup
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@ -657,7 +699,7 @@ stdenv.mkDerivation {
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};
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inherit perl;
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}</programlisting>
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</para>
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<para>It is even possible for one file to refer to another, e.g.,
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@ -695,7 +737,7 @@ in foo</programlisting>
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</varlistentry>
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<varlistentry><term><function>builtins.toPath</function> <replaceable>s</replaceable></term>
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<listitem><para>Convert the string value
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@ -708,7 +750,7 @@ in foo</programlisting>
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</varlistentry>
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<varlistentry><term><function>toString</function> <replaceable>e</replaceable></term>
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<listitem><para>Convert the expression
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@ -720,7 +762,7 @@ in foo</programlisting>
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</varlistentry>
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<varlistentry xml:id='builtin-toXML'><term><function>builtins.toXML</function> <replaceable>e</replaceable></term>
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<listitem><para>Return a string containing an XML representation
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@ -765,7 +807,7 @@ in foo</programlisting>
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<example xml:id='ex-toxml'><title>Passing information to a builder
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using <function>toXML</function></title>
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<programlisting><![CDATA[
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{ stdenv, fetchurl, libxslt, jira, uberwiki }:
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@ -773,7 +815,7 @@ stdenv.mkDerivation (rec {
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name = "web-server";
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buildInputs = [ libxslt ];
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builder = builtins.toFile "builder.sh" "
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source $stdenv/setup
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mkdir $out
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@ -806,7 +848,7 @@ stdenv.mkDerivation (rec {
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<example xml:id='ex-toxml-result'><title>XML representation produced by
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<function>toXML</function></title>
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<programlisting><![CDATA[<?xml version='1.0' encoding='utf-8'?>
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<expr>
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<list>
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@ -835,7 +877,7 @@ stdenv.mkDerivation (rec {
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</varlistentry>
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<varlistentry><term><function>builtins.trace</function>
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<replaceable>e1</replaceable> <replaceable>e2</replaceable></term>
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@ -846,7 +888,7 @@ stdenv.mkDerivation (rec {
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</varlistentry>
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</variablelist>
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Reference in New Issue