refactor: don't expose all of the functions

lua/visual-surround/init.lua

@@ -5,7 +5,7 @@ local Surround = {}
 
 ---@param char string
 ---@return string, string
-function Surround._get_char(char)
+local function get_char(char)
     if char == "(" or char == ")" then
         return "(", ")"
     elseif char == "[" or char == "]" then
@@ -18,7 +18,7 @@ function Surround._get_char(char)
     return char, char
 end
 
-function Surround._set_keymaps()
+local function set_keymaps()
     local keys = Config.opts.surround_chars
     for _, key in ipairs(keys) do
         vim.keymap.set("v", key, function()
@@ -29,7 +29,7 @@ end
 
 ---@param char string
 function Surround.surround(char)
-    local opening_char, closing_char = Surround._get_char(char)
+    local opening_char, closing_char = get_char(char)
     local mode = vim.api.nvim_get_mode().mode
     local bounds = Util.get_bounds(mode)
     if mode == "v" or mode == "V" then
@@ -85,7 +85,7 @@ end
 function Surround.setup(user_opts)
     Config.override_config(user_opts)
     if Config.opts.use_default_keymaps then
-        Surround._set_keymaps()
+        set_keymaps()
     end
 end