discocss: add module

Co-authored-by: Mihai Fufezan <fufexan@protonmail.com>

.github/CODEOWNERS

@@ -93,6 +93,8 @@ Makefile                                              @thiagokokada
 
 /modules/programs/direnv.nix                          @rycee
 
+/modules/programs/discocss.nix                        @Kranzes
+
 /modules/programs/eclipse.nix                         @rycee
 
 /modules/programs/emacs.nix                           @rycee

modules/misc/news.nix

@@ -741,6 +741,13 @@ in
           A new module is available: 'programs.havoc'.
         '';
       }
+
+      {
+        time = "2022-10-12T23:10:48+00:00";
+        message = ''
+          A new module is available: 'programs.discocss'.
+        '';
+      }
     ];
   };
 }

modules/modules.nix

@@ -65,6 +65,7 @@ let
     ./programs/command-not-found/command-not-found.nix
     ./programs/dircolors.nix
     ./programs/direnv.nix
+    ./programs/discocss.nix
     ./programs/eclipse.nix
     ./programs/emacs.nix
     ./programs/eww.nix

modules/programs/discocss.nix

@@ -0,0 +1,49 @@
+{ config, lib, pkgs, ... }:
+
+with lib;
+
+let cfg = config.programs.discocss;
+in {
+  meta.maintainers = with maintainers; [ kranzes ];
+
+  options = {
+    programs.discocss = {
+      enable = mkEnableOption
+        "discocss, a tiny Discord CSS injector for Linux and MacOS";
+
+      package = mkPackageOption pkgs "discocss" { };
+
+      discordPackage = mkPackageOption pkgs "discord" { };
+
+      discordAlias = mkOption {
+        type = types.bool;
+        default = true;
+        description = "Whether to alias discocss to discord.";
+      };
+
+      css = mkOption {
+        type = types.str;
+        default = "";
+        description = "The custom CSS for discocss to use.";
+      };
+    };
+  };
+
+  config = mkIf cfg.enable {
+    assertions = [{
+      assertion = cfg.discordAlias
+        -> !(any (p: p.name == cfg.discord.name) config.home.packages);
+      message =
+        "To use discocss with discordAlias you have to remove discord from home.packages, or set discordAlias to false.";
+    }];
+
+    home.packages = [
+      (cfg.package.override {
+        discordAlias = cfg.discordAlias;
+        discord = cfg.discordPackage;
+      })
+    ];
+
+    xdg.configFile."discocss/custom.css".text = cfg.css;
+  };
+}