wm: Enable XDG MIME and set some defaults

home/common/wm.nix

@@ -2,6 +2,7 @@
 let
   cfg = config.nixfiles.common.wm;
   inherit (lib) mkDefault;
+  mkOverrideEach = pri: lib.mapAttrs (_:v: lib.mkOverride pri v);
 in
 {
   options.nixfiles.common.wm = {
@@ -47,6 +48,25 @@ in
         package = pkgs.swaylock-effects;
       };
     };
+
+
+    # File associations
+    xdg.mimeApps = {
+      enable = true;
+      defaultApplications = let
+        defaultBrowser = [ "firefox.desktop" ];
+      in mkOverrideEach 50 {
+        "x-scheme-handler/https" = defaultBrowser;
+        "x-scheme-handler/http" = defaultBrowser;
+        "text/html" = defaultBrowser;
+        "application/xhtml+xml" = defaultBrowser;
+        "application/pdf" = defaultBrowser;
+      };
+    };
+
+    # this solves some inconsistent behavior with xdg-open
+    xdg.portal.xdgOpenUsePortal = true;
+
     services = {
       udiskie = {
         enable = mkDefault true;

home/package-sets/multimedia.nix

@@ -3,6 +3,7 @@ let
   cfg = config.nixfiles.packageSets.multimedia;
   inherit (lib) optionals mkEnableOption mkIf;
   default = osConfig ? nixfiles && osConfig.nixfiles.packageSets.multimedia.enable;
+  mkOverrideEach = pri: lib.mapAttrs (_:v: lib.mkOverride pri v);
 in
 {
   options.nixfiles.packageSets.multimedia = {
@@ -21,10 +22,29 @@ in
       krita
       inkscape
       obs-studio
+      nomacs
+      audacity
     ] ++ [
       yt-dlp
       imagemagick
       ffmpeg
     ];
+
+    xdg.mimeApps.defaultApplications = lib.mkMerge [
+      # project files
+      (mkOverrideEach 100 {
+        "image/x-xcf" = [ "gimp.desktop" ];
+        "image/x-compressed-xcf" = [ "gimp.desktop" ];
+        "image/x-krita" = [ "krita.desktop" ];
+        "application/x-audacity-project" = [ "audacity.desktop" ];
+        "application/x-audacity-project+sqlite3" = [ "audacity.desktop" ];
+        "image/svg+xml" = [ "org.inkscape.Inkscape.desktop" ];
+        "image/svg+xml-compressed" = [ "org.inkscape.Inkscape.desktop" ];
+      })
+      # general files
+      (with pkgs; mkOverrideEach 150 (config.lib.xdg.mimeAssociations [ nomacs mpv ]))
+      # rest of the files
+      (with pkgs; mkOverrideEach 200 (config.lib.xdg.mimeAssociations [ inkscape gimp audacity ]))
+    ];
   };
 }