forked from lix-project/lix
* Documented nix-instantiate --xml, --strict.
* Added an example to the nix-build section.
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Eelco Dolstra
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8396b59286
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99ef620c8c
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@ -117,4 +117,20 @@ except for <option>--arg</option> and <option>--attr</option> /
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</refsection>
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<refsection><title>Examples</title>
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<screen>
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$ nix-build pkgs/top-level/all-packages.nix -A firefox
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store derivation is /nix/store/qybprl8sz2lc...-firefox-1.5.0.7.drv
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/nix/store/d18hyl92g30l...-firefox-1.5.0.7
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$ ls -l result
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lrwxrwxrwx <replaceable>...</replaceable> result -> /nix/store/d18hyl92g30l...-firefox-1.5.0.7
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$ ls ./result/bin/
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firefox firefox-config</screen>
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</refsection>
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</refentry>
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@ -20,10 +20,16 @@
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</arg>
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<arg><option>--add-root</option> <replaceable>path</replaceable></arg>
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<arg><option>--indirect</option></arg>
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<group choice='opt'>
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<arg choice='plain'><option>--parse-only</option></arg>
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<arg choice='plain'><option>--eval-only</option></arg>
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</group>
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<arg>
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<group choice='req'>
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<arg choice='plain'><option>--parse-only</option></arg>
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<arg choice='plain'>
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<option>--eval-only</option>
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<arg><option>--strict</option></arg>
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</arg>
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</group>
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<arg><option>--xml</option></arg>
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</arg>
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<arg choice='plain' rep='repeat'><replaceable>files</replaceable></arg>
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</cmdsynopsis>
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</refsynopsisdiv>
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@ -85,6 +91,31 @@ common options.</para>
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</varlistentry>
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<varlistentry><term><option>--xml</option></term>
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<listitem><para>When used with <option>--parse-only</option> and
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<option>--eval-only</option>, print the resulting expression as an
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XML representation of the abstract syntax tree rather than as an
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ATerm. The schema is the same as that used by the <link
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linkend="builtin-toXML"><function>toXML</function>
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built-in</link>.</para></listitem>
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</varlistentry>
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<varlistentry><term><option>--strict</option></term>
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<listitem><para>When used with <option>--eval-only</option>,
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recursively evaluate list elements and attributes. Normally, such
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sub-expressions are left unevaluated (since the Nix expression
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language is lazy).</para>
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<warning><para>This option can cause non-termination, because lazy
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data structures can be infinitely large.</para></warning>
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</listitem>
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</varlistentry>
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</variablelist>
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</refsection>
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@ -92,6 +123,9 @@ common options.</para>
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<refsection><title>Examples</title>
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<para>Instantiating store derivations from a Nix expression, and
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building them using <command>nix-store</command>:
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<screen>
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$ nix-instantiate test.nix <lineannotation>(instantiate)</lineannotation>
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/nix/store/cigxbmvy6dzix98dxxh9b6shg7ar5bvs-perl-BerkeleyDB-0.26.drv
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@ -104,6 +138,54 @@ $ ls -l /nix/store/qhqk4n8ci095g3sdp93x7rgwyh9rdvgk-perl-BerkeleyDB-0.26
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dr-xr-xr-x 2 eelco users 4096 1970-01-01 01:00 lib
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...</screen>
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</para>
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<para>Parsing and evaluating Nix expressions:
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<screen>
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$ echo '"foo" + "bar"' | nix-instantiate --parse-only -
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OpPlus(Str("foo"),Str("bar"))
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$ echo '"foo" + "bar"' | nix-instantiate --eval-only -
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Str("foobar")
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$ echo '"foo" + "bar"' | nix-instantiate --eval-only --xml -
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<![CDATA[<?xml version='1.0' encoding='utf-8'?>
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<expr>
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<string value="foobar" />
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</expr>]]></screen>
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</para>
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<para>The difference between non-strict and strict evaluation:
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<screen>
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$ echo 'rec { x = "foo"; y = x; }' | nix-instantiate --eval-only --xml -
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<replaceable>...</replaceable><![CDATA[
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<attr name="x">
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<string value="foo" />
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</attr>
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<attr name="y">
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<unevaluated />
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</attr>]]>
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<replaceable>...</replaceable></screen>
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Note that <varname>y</varname> is left unevaluated (the XML
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representation doesn’t attempt to show non-normal forms).
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<screen>
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$ echo 'rec { x = "foo"; y = x; }' | nix-instantiate --eval-only --xml --strict -
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<replaceable>...</replaceable><![CDATA[
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<attr name="x">
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<string value="foo" />
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</attr>
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<attr name="y">
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<string value="foo" />
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</attr>]]>
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<replaceable>...</replaceable></screen>
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</para>
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</refsection>
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@ -1769,7 +1769,7 @@ in foo</programlisting>
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</varlistentry>
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<varlistentry><term><function>builtins.toXML</function> <replaceable>e</replaceable></term>
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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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of <replaceable>e</replaceable>. The main application for
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