doc/functions/generators: convert to CommonMark

3 files changed, 57 insertions, 75 deletions

diff --git a/doc/functions.xml b/doc/functions.xml
index dd91d705aa9..8ef530d307c 100644
--- a/doc/functions.xml
+++ b/doc/functions.xml
@@ -7,7 +7,7 @@
   The nixpkgs repository has several utility functions to manipulate Nix expressions.
  </para>
  <xi:include href="functions/library.xml" />
- <xi:include href="functions/generators.xml" />
+ <xi:include href="functions/generators.section.xml" />
  <xi:include href="functions/debug.section.xml" />
  <xi:include href="functions/prefer-remote-fetch.section.xml" />
  <xi:include href="functions/nix-gitignore.section.xml" />
diff --git a/doc/functions/generators.section.md b/doc/functions/generators.section.md
new file mode 100644
index 00000000000..bb8426d8087
--- /dev/null
+++ b/doc/functions/generators.section.md
@@ -0,0 +1,56 @@
+# Generators {#sec-generators}
+Generators are functions that create file formats from nix data structures, e. g. for configuration files. There are generators available for: `INI`, `JSON` and `YAML`
+
+All generators follow a similar call interface: `generatorName configFunctions data`, where `configFunctions` is an attrset of user-defined functions that format nested parts of the content. They each have common defaults, so often they do not need to be set manually. An example is `mkSectionName ? (name: libStr.escape [ "[" "]" ] name)` from the `INI` generator. It receives the name of a section and sanitizes it. The default `mkSectionName` escapes `[` and `]` with a backslash.
+
+Generators can be fine-tuned to produce exactly the file format required by your application/service. One example is an INI-file format which uses `: ` as separator, the strings `"yes"`/`"no"` as boolean values and requires all string values to be quoted:
+
+```nix
+with lib;
+let
+  customToINI = generators.toINI {
+    # specifies how to format a key/value pair
+    mkKeyValue = generators.mkKeyValueDefault {
+      # specifies the generated string for a subset of nix values
+      mkValueString = v:
+             if v == true then ''"yes"''
+        else if v == false then ''"no"''
+        else if isString v then ''"${v}"''
+        # and delegats all other values to the default generator
+        else generators.mkValueStringDefault {} v;
+    } ":";
+  };
+
+# the INI file can now be given as plain old nix values
+in customToINI {
+  main = {
+    pushinfo = true;
+    autopush = false;
+    host = "localhost";
+    port = 42;
+  };
+  mergetool = {
+    merge = "diff3";
+  };
+}
+```
+
+This will produce the following INI file as nix string:
+
+```INI
+[main]
+autopush:"no"
+host:"localhost"
+port:42
+pushinfo:"yes"
+str\:ange:"very::strange"
+
+[mergetool]
+merge:"diff3"
+```
+
+::: note
+Nix store paths can be converted to strings by enclosing a derivation attribute like so: `"${drv}"`.
+:::
+
+Detailed documentation for each generator can be found in `lib/generators.nix`.
diff --git a/doc/functions/generators.xml b/doc/functions/generators.xml
deleted file mode 100644
index 9ce1f85eb17..00000000000
--- a/doc/functions/generators.xml
+++ /dev/null
@@ -1,74 +0,0 @@
-<section xmlns="http://docbook.org/ns/docbook"
-         xmlns:xlink="http://www.w3.org/1999/xlink"
-         xmlns:xi="http://www.w3.org/2001/XInclude"
-         xml:id="sec-generators">
- <title>Generators</title>
-
- <para>
-  Generators are functions that create file formats from nix data structures, e. g. for configuration files. There are generators available for: <literal>INI</literal>, <literal>JSON</literal> and <literal>YAML</literal>
- </para>
-
- <para>
-  All generators follow a similar call interface: <code>generatorName configFunctions data</code>, where <literal>configFunctions</literal> is an attrset of user-defined functions that format nested parts of the content. They each have common defaults, so often they do not need to be set manually. An example is <code>mkSectionName ? (name: libStr.escape [ "[" "]" ] name)</code> from the <literal>INI</literal> generator. It receives the name of a section and sanitizes it. The default <literal>mkSectionName</literal> escapes <literal>[</literal> and <literal>]</literal> with a backslash.
- </para>
-
- <para>
-  Generators can be fine-tuned to produce exactly the file format required by your application/service. One example is an INI-file format which uses <literal>: </literal> as separator, the strings <literal>"yes"</literal>/<literal>"no"</literal> as boolean values and requires all string values to be quoted:
- </para>
-
-<programlisting>
-with lib;
-let
-  customToINI = generators.toINI {
-    # specifies how to format a key/value pair
-    mkKeyValue = generators.mkKeyValueDefault {
-      # specifies the generated string for a subset of nix values
-      mkValueString = v:
-             if v == true then ''"yes"''
-        else if v == false then ''"no"''
-        else if isString v then ''"${v}"''
-        # and delegats all other values to the default generator
-        else generators.mkValueStringDefault {} v;
-    } ":";
-  };
-
-# the INI file can now be given as plain old nix values
-in customToINI {
-  main = {
-    pushinfo = true;
-    autopush = false;
-    host = "localhost";
-    port = 42;
-  };
-  mergetool = {
-    merge = "diff3";
-  };
-}
-</programlisting>
-
- <para>
-  This will produce the following INI file as nix string:
- </para>
-
-<programlisting>
-[main]
-autopush:"no"
-host:"localhost"
-port:42
-pushinfo:"yes"
-str\:ange:"very::strange"
-
-[mergetool]
-merge:"diff3"
-</programlisting>
-
- <note>
-  <para>
-   Nix store paths can be converted to strings by enclosing a derivation attribute like so: <code>"${drv}"</code>.
-  </para>
- </note>
-
- <para>
-  Detailed documentation for each generator can be found in <literal>lib/generators.nix</literal>.
- </para>
-</section>