treewide: automatically md-convert option descriptions

the conversion procedure is simple:

 - find all things that look like options, ie calls to either `mkOption`
   or `lib.mkOption` that take an attrset. remember the attrset as the
   option
 - for all options, find a `description` attribute who's value is not a
   call to `mdDoc` or `lib.mdDoc`
 - textually convert the entire value of the attribute to MD with a few
   simple regexes (the set from mdize-module.sh)
 - if the change produced a change in the manual output, discard
 - if the change kept the manual unchanged, add some text to the
   description to make sure we've actually found an option. if the
   manual changes this time, keep the converted description

this procedure converts 80% of nixos options to markdown. around 2000
options remain to be inspected, but most of those fail the "does not
change the manual output check": currently the MD conversion process
does not faithfully convert docbook tags like <code> and <package>, so
any option using such tags will not be converted at all.

3 files changed, 4 insertions, 4 deletions

diff --git a/nixos/modules/i18n/input-method/fcitx5.nix b/nixos/modules/i18n/input-method/fcitx5.nix
index 9ef0285f7b93..7cdef9ae9321 100644
--- a/nixos/modules/i18n/input-method/fcitx5.nix
+++ b/nixos/modules/i18n/input-method/fcitx5.nix
@@ -15,7 +15,7 @@ in {
         type = with types; listOf package;
         default = [];
         example = literalExpression "with pkgs; [ fcitx5-rime ]";
-        description = ''
+        description = lib.mdDoc ''
           Enabled Fcitx5 addons.
         '';
       };
diff --git a/nixos/modules/i18n/input-method/kime.nix b/nixos/modules/i18n/input-method/kime.nix
index 729a665614ae..29224a6bf75f 100644
--- a/nixos/modules/i18n/input-method/kime.nix
+++ b/nixos/modules/i18n/input-method/kime.nix
@@ -27,8 +27,8 @@ in
             };
           }
           '';
-        description = ''
-          kime configuration. Refer to <link xlink:href="https://github.com/Riey/kime/blob/v${pkgs.kime.version}/docs/CONFIGURATION.md"/> for details on supported values.
+        description = lib.mdDoc ''
+          kime configuration. Refer to <https://github.com/Riey/kime/blob/v${pkgs.kime.version}/docs/CONFIGURATION.md> for details on supported values.
         '';
       };
     };
diff --git a/nixos/modules/i18n/input-method/uim.nix b/nixos/modules/i18n/input-method/uim.nix
index 459294657e0a..9491ab2640fc 100644
--- a/nixos/modules/i18n/input-method/uim.nix
+++ b/nixos/modules/i18n/input-method/uim.nix
@@ -13,7 +13,7 @@ in
         type    = types.enum [ "gtk" "gtk3" "gtk-systray" "gtk3-systray" "qt4" ];
         default = "gtk";
         example = "gtk-systray";
-        description = ''
+        description = lib.mdDoc ''
           selected UIM toolbar.
         '';
       };