xdg-mime-apps: add module

modules/misc/xdg-mime-apps.nix

@@ -0,0 +1,88 @@
+{ config, lib, pkgs, ... }:
+
+with lib;
+
+let
+
+  cfg = config.xdg.mimeApps;
+
+  strListOrSingleton = with types;
+    coercedTo (either (listOf str) str) toList (listOf str);
+
+in
+
+{
+  meta.maintainers = with maintainers; [ pacien ];
+
+  options.xdg.mimeApps = {
+    enable = mkOption {
+      type = types.bool;
+      default = false;
+      description = ''
+        Whether to manage <filename>$XDG_CONFIG_HOME/mimeapps.list</filename>.
+        </para>
+        <para>
+        The generated file is read-only.
+      '';
+    };
+
+    # descriptions from
+    # https://specifications.freedesktop.org/mime-apps-spec/mime-apps-spec-1.0.1.html
+
+    associations.added = mkOption {
+      type = types.attrsOf strListOrSingleton;
+      default = { };
+      example = literalExample ''
+        {
+          "mimetype1" = [ "foo1.desktop" "foo2.desktop" "foo3.desktop" ];
+          "mimetype2" = "foo4.desktop";
+        }
+      '';
+      description = ''
+        Defines additional associations of applications with
+        mimetypes, as if the .desktop file was listing this mimetype
+        in the first place.
+      '';
+    };
+
+    associations.removed = mkOption {
+      type = types.attrsOf strListOrSingleton;
+      default = { };
+      example = { "mimetype1" = "foo5.desktop"; };
+      description = ''
+        Removes associations of applications with mimetypes, as if the
+        .desktop file was <emphasis>not</emphasis> listing this
+        mimetype in the first place.
+      '';
+    };
+
+    defaultApplications = mkOption {
+      type = types.attrsOf strListOrSingleton;
+      default = { };
+      example = literalExample ''
+        {
+          "mimetype1" = [ "default1.desktop" "default2.desktop" ];
+        }
+      '';
+      description = ''
+        The default application to be used for a given mimetype. This
+        is, for instance, the one that will be started when
+        double-clicking on a file in a file manager. If the
+        application is no longer installed, the next application in
+        the list is attempted, and so on.
+      '';
+    };
+  };
+
+  config = mkIf cfg.enable {
+    xdg.configFile."mimeapps.list".text =
+      let
+        joinValues = mapAttrs (n: concatStringsSep ";");
+      in
+        generators.toINI {} {
+          "Added Associations" = joinValues cfg.associations.added;
+          "Removed Associations" = joinValues cfg.associations.removed;
+          "Default Applications" = joinValues cfg.defaultApplications;
+        };
+  };
+}

modules/modules.nix

@@ -33,8 +33,9 @@ let
     (loadModule ./misc/qt.nix { })
     (loadModule ./misc/submodule-support.nix { })
     (loadModule ./misc/version.nix { })
-    (loadModule ./misc/xdg.nix { })
+    (loadModule ./misc/xdg-mime-apps.nix { condition = hostPlatform.isLinux; })
     (loadModule ./misc/xdg-user-dirs.nix { condition = hostPlatform.isLinux; })
+    (loadModule ./misc/xdg.nix { })
     (loadModule ./programs/afew.nix { })
     (loadModule ./programs/alacritty.nix { })
     (loadModule ./programs/alot.nix { })