cmus: add module

PR #5951

modules/programs/cmus.nix

@@ -0,0 +1,44 @@
+{ config, lib, pkgs, ... }:
+
+with lib;
+
+let
+
+  cfg = config.programs.cmus;
+
+in {
+  meta.maintainers = [ hm.maintainers.joygnu ];
+
+  options.programs.cmus = {
+    enable = mkEnableOption "Enable cmus, the music player.";
+
+    theme = mkOption {
+      type = types.lines;
+      default = "";
+      example = "gruvbox";
+      description = ''
+        Select color theme. A list of available color themes can be found
+        here: <https://github.com/cmus/cmus/tree/master/data>.
+      '';
+    };
+
+    extraConfig = mkOption {
+      type = types.lines;
+      default = "";
+      example = ''
+        set audio_backend = "mpd"
+        set status_display = "default"
+      '';
+      description = "Extra configuration to add to cmus {file}`rc`.";
+    };
+  };
+
+  config = mkIf cfg.enable {
+    home.packages = [ pkgs.cmus ];
+
+    home.file.".config/cmus/rc".text = ''
+      ${optionalString (cfg.theme != "") "colorscheme ${cfg.theme}"}
+      ${cfg.extraConfig}
+    '';
+  };
+}