* Follow our own coding conventions.
This commit is contained in:
Eelco Dolstra
parent
f2d65c9c80
commit
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3 changed files with 60 additions and 64 deletions
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@ -43,10 +43,10 @@ is also available as <function>builtins.derivation</function>.</para>
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<listitem><para>Return the names of the attributes in the
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attribute set <replaceable>attrs</replaceable> in a sorted list.
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For instance, <literal>builtins.attrNames {y = 1; x =
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"foo";}</literal> evaluates to <literal>["x" "y"]</literal>.
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There is no built-in function <function>attrValues</function>, but
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you can easily define it yourself:
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For instance, <literal>builtins.attrNames { y = 1; x = "foo";
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}</literal> evaluates to <literal>[ "x" "y" ]</literal>. There is
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no built-in function <function>attrValues</function>, but you can
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easily define it yourself:
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<programlisting>
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attrValues = attrs: map (name: builtins.getAttr name attrs) (builtins.attrNames attrs);</programlisting>
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@ -442,10 +442,10 @@ x: x + 456</programlisting>
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Example:
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<programlisting>
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builtins.listToAttrs [
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{name = "foo"; value = 123;}
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{name = "bar"; value = 456;}
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]
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builtins.listToAttrs
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[ { name = "foo"; value = 123; }
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{ name = "bar"; value = 456; }
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]
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</programlisting>
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evaluates to
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@ -466,10 +466,10 @@ builtins.listToAttrs [
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example,
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<programlisting>
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map (x: "foo" + x) ["bar" "bla" "abc"]</programlisting>
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map (x: "foo" + x) [ "bar" "bla" "abc" ]</programlisting>
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evaluates to <literal>["foobar" "foobla"
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"fooabc"]</literal>.</para></listitem>
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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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@ -491,10 +491,10 @@ map (x: "foo" + x) ["bar" "bla" "abc"]</programlisting>
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a package name and version. The package name is everything up to
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but not including the first dash followed by a digit, and the
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version is everything following that dash. The result is returned
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in an attribute set <literal>{name, version}</literal>. Thus,
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in an attribute set <literal>{ name, version }</literal>. Thus,
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<literal>builtins.parseDrvName "nix-0.12pre12876"</literal>
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returns <literal>{name = "nix"; version =
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"0.12pre12876";}</literal>.</para></listitem>
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returns <literal>{ name = "nix"; version = "0.12pre12876";
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}</literal>.</para></listitem>
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</varlistentry>
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@ -550,9 +550,9 @@ in config.someSetting</programlisting>
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exist in <replaceable>attrs</replaceable>. For instance,
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<screen>
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removeAttrs { x = 1; y = 2; z = 3; } ["a" "x" "z"]</screen>
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removeAttrs { x = 1; y = 2; z = 3; } [ "a" "x" "z" ]</screen>
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evaluates to <literal>{y = 2;}</literal>.</para></listitem>
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evaluates to <literal>{ y = 2; }</literal>.</para></listitem>
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</varlistentry>
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@ -632,7 +632,7 @@ removeAttrs { x = 1; y = 2; z = 3; } ["a" "x" "z"]</screen>
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linkend='ex-hello-builder' /> into one file:
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<programlisting>
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{stdenv, fetchurl, perl}:
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{ stdenv, fetchurl, perl }:
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stdenv.mkDerivation {
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name = "hello-2.1.1";
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@ -765,12 +765,12 @@ in foo</programlisting>
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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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{ stdenv, fetchurl, libxslt, jira, uberwiki }:
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stdenv.mkDerivation (rec {
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name = "web-server";
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buildInputs = [libxslt];
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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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@ -264,8 +264,8 @@
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expression evaluator will automatically try to call functions that
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it encounters. It can automatically call functions for which every
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argument has a <link linkend='ss-functions'>default value</link>
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(e.g., <literal>{<replaceable>argName</replaceable> ?
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<replaceable>defaultValue</replaceable>}:
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(e.g., <literal>{ <replaceable>argName</replaceable> ?
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<replaceable>defaultValue</replaceable> }:
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<replaceable>...</replaceable></literal>). With
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<option>--arg</option>, you can also call functions that have
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arguments without a default value (or override a default value).
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@ -52,7 +52,7 @@ need to do three things:
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<example xml:id='ex-hello-nix'><title>Nix expression for GNU Hello
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(<filename>default.nix</filename>)</title>
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<programlisting>
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{stdenv, fetchurl, perl}: <co xml:id='ex-hello-nix-co-1' />
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{ stdenv, fetchurl, perl }: <co xml:id='ex-hello-nix-co-1' />
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stdenv.mkDerivation { <co xml:id='ex-hello-nix-co-2' />
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name = "hello-2.1.1"; <co xml:id='ex-hello-nix-co-3' />
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@ -92,8 +92,8 @@ the single Nix expression in that directory
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function that downloads files. <varname>perl</varname> is the
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Perl interpreter.</para>
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<para>Nix functions generally have the form <literal>{x, y, ...,
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z}: e</literal> where <varname>x</varname>, <varname>y</varname>,
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<para>Nix functions generally have the form <literal>{ x, y, ...,
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z }: e</literal> where <varname>x</varname>, <varname>y</varname>,
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etc. are the names of the expected arguments, and where
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<replaceable>e</replaceable> is the body of the function. So
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here, the entire remainder of the file is the body of the
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@ -114,10 +114,10 @@ the single Nix expression in that directory
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<emphasis>attributes</emphasis>. An attribute set is just a list
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of key/value pairs where each value is an arbitrary Nix
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expression. They take the general form
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<literal>{<replaceable>name1</replaceable> =
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<literal>{ <replaceable>name1</replaceable> =
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<replaceable>expr1</replaceable>; <replaceable>...</replaceable>
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<replaceable>nameN</replaceable> =
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<replaceable>exprN</replaceable>;}</literal>.</para>
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<replaceable>exprN</replaceable>; }</literal>.</para>
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</callout>
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@ -564,7 +564,7 @@ genericBuild <co xml:id='ex-hello-builder2-co-3' /></programlisting>
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expression, like this:
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<programlisting>
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buildInputs = [perl];</programlisting>
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buildInputs = [ perl ];</programlisting>
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The <varname>perl</varname> attribute can then be removed, and the
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builder becomes even shorter:
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@ -771,14 +771,14 @@ stdenv.mkDerivation {
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values between square brackets. For example,
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<programlisting>
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[ 123 ./foo.nix "abc" (f {x=y;}) ]</programlisting>
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[ 123 ./foo.nix "abc" (f { x = y; }) ]</programlisting>
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defines a list of four elements, the last being the result of a call
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to the function <varname>f</varname>. Note that function calls have
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to be enclosed in parentheses. If they had been omitted, e.g.,
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<programlisting>
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[ 123 ./foo.nix "abc" f {x=y;} ]</programlisting>
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[ 123 ./foo.nix "abc" f { x = y; } ]</programlisting>
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the result would be a list of five elements, the fourth one being a
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function and the fifth being an attribute set.</para>
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@ -891,15 +891,12 @@ propagate attributes). This can be shortened using the
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<literal>inherit</literal> keyword. For instance,
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<programlisting>
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let
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x = 123;
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in
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{
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inherit x;
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y = 456;
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}</programlisting>
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let x = 123; in
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{ inherit x;
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y = 456;
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}</programlisting>
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evaluates to <literal>{x = 123; y = 456;}</literal>. (Note that this
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evaluates to <literal>{ x = 123; y = 456; }</literal>. (Note that this
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works because <varname>x</varname> is added to the lexical scope by
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the <literal>let</literal> construct.) It is also possible to inherit
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attributes from another attribute set. For instance, in this fragment
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@ -960,20 +957,20 @@ in if negate true then concat "foo" "bar" else ""</programlisting>
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arguments of a function); e.g.,
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<programlisting>
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map (concat "foo") ["bar" "bla" "abc"]</programlisting>
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map (concat "foo") [ "bar" "bla" "abc" ]</programlisting>
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evaluates to <literal>["foobar" "foobla"
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"fooabc"]</literal>.</para></listitem>
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evaluates to <literal>[ "foobar" "foobla"
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"fooabc" ]</literal>.</para></listitem>
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<listitem><para>An <emphasis>attribute set pattern</emphasis> of the
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form <literal>{name1, name2, …, nameN}</literal>
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form <literal>{ name1, name2, …, nameN }</literal>
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matches an attribute set containing the listed attributes, and binds
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the values of those attributes to variables in the function body.
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For example, the function
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<programlisting>
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{x, y, z}: z + y + x</programlisting>
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{ x, y, z }: z + y + x</programlisting>
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can only be called with a set containing exactly the attributes
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<varname>x</varname>, <varname>y</varname> and
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@ -982,7 +979,7 @@ map (concat "foo") ["bar" "bla" "abc"]</programlisting>
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(<literal>...</literal>):
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<programlisting>
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{x, y, z, ...}: z + y + x</programlisting>
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{ x, y, z, ... }: z + y + x</programlisting>
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This works on any set that contains at least the three named
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attributes.</para>
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@ -995,7 +992,7 @@ map (concat "foo") ["bar" "bla" "abc"]</programlisting>
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<replaceable>e</replaceable> is an arbitrary expression. For example,
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<programlisting>
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{x, y ? "foo", z ? "bar"}: z + y + x</programlisting>
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{ x, y ? "foo", z ? "bar" }: z + y + x</programlisting>
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specifies a function that only requires an attribute named
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<varname>x</varname>, but optionally accepts <varname>y</varname>
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@ -1007,11 +1004,11 @@ map (concat "foo") ["bar" "bla" "abc"]</programlisting>
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of the <literal>@</literal>-sign. For example:
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<programlisting>
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args@{x, y, z, ...}: z + y + x + args.a</programlisting>
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args@{ x, y, z, ... }: z + y + x + args.a</programlisting>
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Here <varname>args</varname> is bound to the entire argument, which
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is further matches against the pattern <literal>{x, y, z,
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...}</literal>.</para></listitem>
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is further matches against the pattern <literal>{ x, y, z,
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... }</literal>.</para></listitem>
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</itemizedlist>
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@ -1020,8 +1017,8 @@ args@{x, y, z, ...}: z + y + x + args.a</programlisting>
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a name, you can bind them to an attribute, e.g.,
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<programlisting>
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let concat = {x, y}: x + y;
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in concat {x = "foo"; y = "bar";}</programlisting>
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let concat = { x, y }: x + y;
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in concat { x = "foo"; y = "bar"; }</programlisting>
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</para>
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@ -1142,7 +1139,7 @@ lexical scope of the expression <replaceable>e2</replaceable>. For
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instance,
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<programlisting>
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let as = {x = "foo"; y = "bar";};
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let as = { x = "foo"; y = "bar"; };
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in with as; x + y</programlisting>
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evaluates to <literal>"foobar"</literal> since the
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@ -1480,21 +1477,20 @@ allowedReferences = [];
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references graph of their inputs. The attribute is a list of
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inputs in the Nix store whose references graph the builder needs
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to know. The value of this attribute should be a list of pairs
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<literal>[<replaceable>name1</replaceable>
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<literal>[ <replaceable>name1</replaceable>
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<replaceable>path1</replaceable> <replaceable>name2</replaceable>
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<replaceable>path2</replaceable>
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<replaceable>...</replaceable>]</literal>. The references graph
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of each <replaceable>pathN</replaceable> will be stored in a text
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file <replaceable>nameN</replaceable> in the temporary build
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directory. The text files have the format used by
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<command>nix-store --register-validity</command> (with the deriver
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fields left empty). For example, when the following derivation is
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built:
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<replaceable>path2</replaceable> <replaceable>...</replaceable>
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]</literal>. The references graph of each
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<replaceable>pathN</replaceable> will be stored in a text file
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<replaceable>nameN</replaceable> in the temporary build directory.
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The text files have the format used by <command>nix-store
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--register-validity</command> (with the deriver fields left
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empty). For example, when the following derivation is built:
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<programlisting>
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derivation {
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...
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exportReferencesGraph = ["libfoo-graph" libfoo];
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exportReferencesGraph = [ "libfoo-graph" libfoo ];
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};
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</programlisting>
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@ -1571,14 +1567,14 @@ fetchurl {
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<varname>fetchurl</varname>:
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<programlisting>
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{stdenv, curl}: # The <command>curl</command> program is used for downloading.
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{ stdenv, curl }: # The <command>curl</command> program is used for downloading.
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{url, md5}:
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{ url, md5 }:
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stdenv.mkDerivation {
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name = baseNameOf (toString url);
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builder = ./builder.sh;
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buildInputs = [curl];
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buildInputs = [ curl ];
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# This is a fixed-output derivation; the output must be a regular
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# file with MD5 hash <varname>md5</varname>.
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@ -1650,7 +1646,7 @@ stdenv.mkDerivation {
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Nixpkgs has the line
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<programlisting>
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impureEnvVars = ["http_proxy" "https_proxy" <replaceable>...</replaceable>];
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impureEnvVars = [ "http_proxy" "https_proxy" <replaceable>...</replaceable> ];
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</programlisting>
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to make it use the proxy server configuration specified by the
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