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authorDomen Kožar <domen@dev.si>2018-11-08T12·03+0000
committerDomen Kožar <domen@dev.si>2018-11-08T12·03+0000
commit0bea4a50e035c06805ac65360b1b50d3681e4f87 (patch)
treeea76815c62905fa70dbaa59b59d1e8f9216ab0b4 /doc/manual/expressions/builtins.xml
parent8327a7a8fa0ce6f6b1d1e0ea1324d053a031e438 (diff)
Deprecate builtins.toPath
Diffstat (limited to 'doc/manual/expressions/builtins.xml')
-rw-r--r--doc/manual/expressions/builtins.xml29
1 files changed, 6 insertions, 23 deletions
diff --git a/doc/manual/expressions/builtins.xml b/doc/manual/expressions/builtins.xml
index 873f30b062ee..3f396ac1d991 100644
--- a/doc/manual/expressions/builtins.xml
+++ b/doc/manual/expressions/builtins.xml
@@ -1027,22 +1027,8 @@ Evaluates to <literal>[ "foo" ]</literal>.
   <replaceable>path</replaceable></term>
 
     <listitem><para>Return <literal>true</literal> if the path
-    <replaceable>path</replaceable> exists, and
-    <literal>false</literal> otherwise.  One application of this
-    function is to conditionally include a Nix expression containing
-    user configuration:
-
-<programlisting>
-let
-  fileName = builtins.getEnv "CONFIG_FILE";
-  config =
-    if fileName != "" &amp;&amp; builtins.pathExists (builtins.toPath fileName)
-    then import (builtins.toPath fileName)
-    else { someSetting = false; }; <lineannotation># default configuration</lineannotation>
-in config.someSetting</programlisting>
-
-    (Note that <envar>CONFIG_FILE</envar> must be an absolute path for
-    this to work.)</para></listitem>
+    <replaceable>path</replaceable> exists at evaluation time, and
+    <literal>false</literal> otherwise.
 
   </varlistentry>
 
@@ -1344,13 +1330,10 @@ in foo</programlisting>
 
   <varlistentry><term><function>builtins.toPath</function> <replaceable>s</replaceable></term>
 
-    <listitem><para>Convert the string value
-    <replaceable>s</replaceable> into a path value.  The string
-    <replaceable>s</replaceable> must represent an absolute path
-    (i.e., must start with <literal>/</literal>).  The path need not
-    exist.  The resulting path is canonicalised, e.g.,
-    <literal>builtins.toPath "//foo/xyzzy/../bar/"</literal> returns
-    <literal>/foo/bar</literal>.</para></listitem>
+    <listitem><para> DEPRECATED. Use <literal>/. + "/path"</literal>
+    to convert a string into an absolute path. For relative paths,
+    use <literal>./. + "/path"</literal>.
+    </para></listitem>
 
   </varlistentry>