thumbnailing

modules/desktop/default.nix

@@ -15,6 +15,7 @@ in {
     {
       modules.desktop.fonts.enable = true;
       modules.desktop.fonts.baseFonts = true;
+      modules.desktop.thumbnailers.enable = true;
 
       # enable networking
       networking.networkmanager.enable = true;

modules/desktop/thumbnailers.nix

@@ -0,0 +1,33 @@
+{ lib, config, pkgs, ... }:
+
+with lib;
+let
+  cfg = config.modules.desktop.thumbnailers;
+in {
+  options.modules.desktop.thumbnailers = {
+    enable = mkEnableOption "Enable a collection of thumbnailers";
+  };
+
+  config = mkIf cfg.enable {
+    hm.home.packages = let
+      mkThumbnailer = { name, mime, exec }: pkgs.writeTextFile {
+        name = "${name}-thumbnailer";
+        destination = "/share/thumbnailers/${name}.thumbnailer";
+        text = ''
+          [Thumbnailer Entry]
+          Exec=${exec}
+          MimeType=${mime}
+        '';
+      };
+    in [
+      # videos
+      pkgs.ffmpegthumbnailer
+      # krita
+      (mkThumbnailer {
+        name = "kra";
+        mime = "application/x-krita";
+        exec = "sh -c \"${pkgs.unzip}/bin/unzip -p %i preview.png > %o\"";
+      })
+    ];
+  };
+}