add support for gtk (#7)

feat(modules): add support for gtk

Co-authored-by: Sam Nystrom <sam@samnystrom.dev>

modules/home-manager/default.nix

@@ -2,6 +2,7 @@
   imports = [
     ./bat.nix
     ./starship.nix
+    ./gtk.nix
   ];
   options.catppuccin = {
     flavour = lib.mkOption {
@@ -9,5 +10,10 @@
       default = "latte";
       description = "Global Catppuccin flavour";
     };
+    accent = lib.mkOption {
+      type = lib.types.enum [ "blue" "flamingo" "green" "lavender" "maroon" "mauve" "peach" "pink" "red" "rosewater" "sapphire" "sky" "teal" "yellow" ];
+      default = "teal";
+      description = "Global Catppuccin accent";
+    };
   };
 }

modules/home-manager/gtk.nix

@@ -0,0 +1,52 @@
+{ config, pkgs, lib, ... }:
+let cfg = config.gtk.catppuccin;
+in {
+  options.gtk.catppuccin = with lib; {
+    enable = mkEnableOption "Catppuccin theme";
+    flavour = mkOption {
+      type = types.enum [ "latte" "frappe" "macchiato" "mocha" ];
+      default = config.catppuccin.flavour;
+      description = "Catppuccin flavour for gtk";
+    };
+    accent = mkOption {
+      type = types.enum [ "blue" "flamingo" "green" "lavender" "maroon" "mauve" "peach" "pink" "red" "rosewater" "sapphire" "sky" "teal" "yellow" ];
+      default = config.catppuccin.accent;
+      description = "Catppuccin accents for gtk";
+    };
+    size = mkOption {
+      type = types.enum [ "standard" "compact" ];
+      default = "standard";
+      description = "Catppuccin size variant for gtk";
+    };
+    tweaks = mkOption {
+      type = types.listOf (types.enum [ "black" "rimless" "normal" ]);
+      default = [ "normal" ];
+      description = "Catppuccin tweaks for gtk";
+    };
+  };
+
+  config.gtk.theme = with lib;
+    with builtins;
+    let
+      # string -> string
+      # this capitalizes the first letter in a string
+      # it's used to set the theme name correctly here
+      mkUpper = word: (toUpper (substring 0 1 word)) + (substring 1 (stringLength word) word);
+
+      flavourUpper = mkUpper cfg.flavour;
+      accentUpper = mkUpper cfg.accent;
+      sizeUpper = mkUpper cfg.size;
+
+      # use the light gtk theme for latte
+      gtkTheme = if cfg.flavour == "latte" then "Light" else "Dark";
+
+    in mkIf cfg.enable {
+      name =
+        "Catppuccin-${flavourUpper}-${sizeUpper}-${accentUpper}-${gtkTheme}";
+      package = pkgs.catppuccin-gtk.override {
+        inherit (cfg) size tweaks;
+        accents = [ cfg.accent ];
+        variant = cfg.flavour;
+      };
+    };
+}