nvf: add custom theme module \

outputs/pkgs/ook-vim/modules/plugins/theme/config.nix

@@ -0,0 +1,49 @@
+{
+  config,
+  lib,
+  pkgs,
+  ...
+}: let
+  inherit (lib) mkIf;
+  inherit (lib.nvim.dag) entryBefore;
+  inherit (lib.nvim.lua) toLuaObject;
+
+  cfg = config.vim.theme.custom;
+
+  themePlugin = pkgs.vimUtils.buildVimPlugin {
+    inherit (cfg) name;
+    src = pkgs.writeTextDir "colors/${cfg.name}.lua" ''
+      local M = {}
+      M.highlights = ${toLuaObject cfg.highlights}
+
+      local function set_groups()
+        for group, settings in pairs(M.highlights) do
+          vim.api.nvim_set_hl(0, group, settings)
+        end
+      end
+
+      function M.colorscheme()
+        vim.api.nvim_command("hi clear")
+        if vim.fn.exists("syntax_on") then
+          vim.api.nvim_command("syntax reset")
+        end
+
+        vim.o.termguicolors = true
+        vim.g.colors_name = "${cfg.name}"
+
+        set_groups()
+      end
+
+      return M.colorscheme()
+    '';
+  };
+in {
+  config = mkIf cfg.enable {
+    vim = {
+      startPlugins = [themePlugin];
+      luaConfigRC.customTheme = ''
+        vim.cmd.colorscheme("${cfg.name}")
+      '';
+    };
+  };
+}