feat(home-manager): add support for btop (#20)

modules/home-manager/btop.nix

@@ -0,0 +1,29 @@
+{ config, pkgs, lib, ... }:
+let
+  cfg = config.programs.btop.catppuccin;
+  themePath = "/themes/catppuccin_${cfg.flavour}.theme";
+  theme = pkgs.fetchFromGitHub {
+    owner = "catppuccin";
+    repo = "btop";
+    rev = "7109eac2884e9ca1dae431c0d7b8bc2a7ce54e54";
+    sha256 = "sha256-QoPPx4AzxJMYo/prqmWD/CM7e5vn/ueyx+XQ5+YfHF8=";
+  } + themePath;
+in {
+  options.programs.btop.catppuccin = with lib; {
+    enable = mkEnableOption "Catppuccin theme";
+    flavour = mkOption {
+      type = types.enum [ "latte" "frappe" "macchiato" "mocha" ];
+      default = config.catppuccin.flavour;
+      description = "Catppuccin flavour for btop";
+    };
+  };
+
+  # xdg is required for this to work
+  config.xdg.enable = with lib; mkIf cfg.enable (mkForce true);
+
+  config.xdg.configFile."btop${themePath}".source = with lib;
+    mkIf cfg.enable theme;
+
+  config.programs.btop.settings.color_theme = with lib;
+    mkIf cfg.enable "${config.xdg.configHome + "/btop/${themePath}"}";
+}

modules/home-manager/default.nix

@@ -3,6 +3,7 @@
     ./alacritty.nix
     ./bat.nix
     ./bottom.nix
+    ./btop.nix
     ./kitty.nix
     ./starship.nix
     ./helix.nix