docs: added more info on how to override colors and highlihgts

lua/tokyonight/extra/init.lua

@@ -23,6 +23,7 @@ function M.setup()
     foot = "ini",
     tilix = "json",
     iterm = "itermcolors",
+    lua = "lua",
   }
   -- map of style to style name
   local styles = {

lua/tokyonight/extra/lua.lua

@@ -0,0 +1,28 @@
+local M = {}
+
+--- @param colors ColorScheme
+function M.generate(colors)
+  local function deepcopy(tbl)
+    local ret = tbl
+    if type(tbl) == "table" then
+      ret = {}
+      for key, value in pairs(tbl) do
+        ret[key] = deepcopy(value)
+      end
+    end
+    return ret
+  end
+
+  colors = vim.deepcopy(colors)
+  colors._upstream_url = nil
+  colors._style_name = nil
+
+  local ret = "local colors = "
+    .. vim.inspect(colors)
+    .. "\n\nlocal highlights = "
+    .. vim.inspect(deepcopy(require("tokyonight.theme").setup().highlights))
+    .. "\n"
+  return ret
+end
+
+return M