Add kitty theming

Signed-off-by: Nikolaos Karaolidis <nick@karaolidis.com>

users/configs/matugen/default.nix

@@ -1,4 +1,4 @@
-{ user ? throw "user argument is required" }: { config, ... }:
+{ user ? throw "user argument is required" }: { config, lib, pkgs, ... }:
 
 let
   hmConfig = config.home-manager.users."${user.name}";
@@ -44,6 +44,7 @@ in
             flavour = hmConfig.theme.flavour;
             contrast = builtins.toString hmConfig.theme.contrast;
             opacity = builtins.toString hmConfig.theme.opacity;
+            transparency = builtins.toString (1 - hmConfig.theme.opacity);
             radius = builtins.toString hmConfig.theme.radius;
             padding = builtins.toString hmConfig.theme.padding;
             double_padding = builtins.toString (hmConfig.theme.padding * 2);
@@ -54,5 +55,17 @@ in
         templates = { };
       };
     };
+
+    theme.extraConfig = let name = "theme-matugen"; in
+      lib.mkBefore "${pkgs.writeShellApplication {
+        inherit name;
+        runtimeInputs = with pkgs; [ matugen ];
+        text = ''
+          matugen image "${hmConfig.theme.configDir}/wallpaper" \
+            --type scheme-${hmConfig.theme.flavour} \
+            --mode "$(cat "${hmConfig.theme.configDir}/mode")" \
+            --contrast ${builtins.toString hmConfig.theme.contrast}
+        '';
+      }}/bin/${name}";
   };
 }