Make module more general

flake.nix

@@ -17,7 +17,7 @@
   in {
     packages = forAllSystems (system: pkgs: {
       default = self.packages.${system}.gitea-theme-monokai;
-      gitea-theme-monokai = pkgs.callPackage ./default.nix { };
+      gitea-theme-monokai = pkgs.callPackage ./themes/monokai { };
 
       test-machine = let
         system = "x86_64-linux";
@@ -35,10 +35,10 @@
             system.stateVersion = "23.11";
             boot.isContainer = true;
           }
-          {
+          ({pkgs, ... }: {
             services.gitea.enable = true;
-            services.gitea-themes.monokai.enable = true;
-          }
+            services.gitea-themes."monokai" = pkgs.gitea-theme-monokai;
+          })
         ];
       }).config.system.build.toplevel;
     });

module.nix

@@ -1,22 +1,27 @@
 { config, pkgs, lib, ... }:
 let
-  cfg = config.services.gitea-themes.monokai;
+  cfg = config.services.gitea-themes;
   giteaCfg = config.services.gitea;
 in
 {
-  options.services.gitea-themes.monokai = {
-    enable = lib.mkEnableOption "monokai theme for gitea";
-    package = lib.mkPackageOption pkgs "gitea-theme-monokai" { };
+  options.services.gitea-themes = lib.mkOption {
+    description = ''
+      Derivations containing gitea themes to install.
+
+      The theme should be named `theme-<name>.css`, and reside in `$out/share/gitea/public/assets/css/`.
+    '';
+    default = { };
+    type = with lib.types; attrsOf path;
   };
 
-  config = lib.mkIf (cfg.enable && giteaCfg.enable)  {
-    services.gitea.settings.ui.THEMES = lib.strings.concatStringsSep "," [
+  config = lib.mkIf (cfg != { }) {
+    services.gitea.settings.ui.THEMES = lib.strings.concatStringsSep "," ([
       "gitea"
       "arc-green"
-      "monokai"
-    ];
+    ] ++ lib.attrNames cfg);
 
-    systemd.services.install-gitea-theme-monokai = {
+    systemd.services.install-gitea-themes = {
+      description = "Install gitea themes in gitea's CUSTOM_DIR";
       wantedBy = [ "gitea.service" ];
       requiredBy = [ "gitea.service" ];
 
@@ -25,13 +30,11 @@ in
         User = giteaCfg.user;
         Group = giteaCfg.group;
       };
-      script = ''
+      script = lib.concatMapStringsSep "\n" (theme-package: ''
         mkdir -p "${giteaCfg.customDir}/public/assets/css"
-        if ! [ -f "${giteaCfg.customDir}/public/assets/css/theme-monokai.css" ]; then
-          ln -s "${cfg.package}/share/gitea/public/assets/css/theme-monokai.css" "${giteaCfg.customDir}/public/assets/css/theme-monokai.css"
-          ln -s "${cfg.package}/share/gitea/public/css/theme-monokai.css" "${giteaCfg.customDir}/public/css/theme-monokai.css"
-        fi
-      '';
+        ln -s "${theme-package}/share/gitea/public/assets/css/*.css" "${giteaCfg.customDir}/public/assets/css/" ||:
+        ln -s "${theme-package}/share/gitea/public/css/*.css" "${giteaCfg.customDir}/public/css/" ||:
+      '') (lib.attrValues cfg);
     };
   };
 }