treewide: begin restructuring the module tree

modules/plugins/theme/theme.nix

@@ -0,0 +1,52 @@
+{
+  config,
+  lib,
+  ...
+}: let
+  inherit (lib.options) mkOption;
+  inherit (lib.attrsets) attrNames;
+  inherit (lib.types) bool lines enum;
+  inherit (lib.modules) mkIf;
+  inherit (lib.nvim.dag) entryBefore;
+
+  cfg = config.vim.theme;
+  supported_themes = import ./supported_themes.nix {inherit lib;};
+in {
+  options.vim.theme = {
+    enable = mkOption {
+      type = bool;
+      description = "Enable theming";
+    };
+
+    name = mkOption {
+      type = enum (attrNames supported_themes);
+      description = "Supported themes can be found in `supported_themes.nix`";
+    };
+
+    style = mkOption {
+      type = enum supported_themes.${cfg.name}.styles;
+      description = "Specific style for theme if it supports it";
+    };
+
+    transparent = mkOption {
+      type = bool;
+      default = false;
+      description = "Whether or not transparency should be enabled. Has no effect for themes that do not support transparency";
+    };
+
+    extraConfig = mkOption {
+      type = lines;
+      description = "Additional lua configuration to add before setup";
+    };
+  };
+
+  config = mkIf cfg.enable {
+    vim = {
+      startPlugins = [cfg.name];
+      luaConfigRC = {
+        themeSetup = entryBefore ["theme"] cfg.extraConfig;
+        theme = supported_themes.${cfg.name}.setup (with cfg; {inherit style transparent;});
+      };
+    };
+  };
+}