colors: add color options, add catpuccin-mocha.nix

modules/options/style/colors.nix

@@ -1,22 +1,49 @@
-{lib, ...}: let
-  inherit (lib) mkOption;
-  inherit (lib.types) str;
+# NOTE: This module is entirely inspired by raf,
+# most of the nix code is also taken from him,
+# so please do check out his configuration!
+{
+  config,
+  lib,
+  ...
+}: let
+  inherit (lib) mkOptionType isString mkOption;
+  inherit (lib.strings) replaceStrings hasPrefix removePrefix toLower;
+  inherit (lib.types) enum str coercedTo nullOr attrsOf;
+
+  cfg = config.modules.style;
+
+  nameToSlug = name: toLower (replaceStrings [" "] ["-"] name);
+
+  hexColorType = mkOptionType {
+    name = "hex-color";
+    descriptionClass = "noun";
+    description = "RGB color in hex format";
+    check = x: isString x && !(hasPrefix "#" x);
+  };
+
+  colorType = attrsOf (coercedTo str (removePrefix "#") hexColorType);
+
+  getPaletteFromScheme = slug:
+    if builtins.pathExists ./palettes/${slug}.nix
+    then (import ./palettes/${slug}.nix).colorscheme.palette
+    else throw "The following colorscheme was imported but not found: ${slug}";
 in {
   options.modules.style = {
     colorScheme = {
       name = mkOption {
-        type = str;
+        type = nullOr (enum ["Catppuccin Mocha" "Catppuccin Latte"]);
         default = "Catppuccin Mocha";
       };
       slug = {
         type = str;
-        default = "catppuccin-mocha";
+        default = nameToSlug "${toString cfg.colorScheme.name}";
       };
       variant = {
       };
-      colors =
-        mkOption {
-        };
+      colors = mkOption {
+        type = colorType;
+        default = getPaletteFromScheme cfg.colorScheme.slug;
+      };
     };
   };
 }