fix: escaping in replace_in_file tool

lua/chatgpt_nvim/tools/replace_in_file.lua

@@ -3,8 +3,11 @@ local robust_lsp = require("chatgpt_nvim.tools.lsp_robust_diagnostics")
 
 local M = {}
 
--- Enhanced search_and_replace to track if a string was found. We use Lua’s gsub return value 
+-- Function to escape all Lua pattern magic characters:
--- (updatedString, replacementCount) to see if any replacements occurred.
+local function escape_lua_pattern(s)
+  return s:gsub("([%^%$%(%)%%%.%[%]%*%+%-%?])", "%%%1")
+end
+
 local function search_and_replace(original, replacements)
   local updated = original
   local info_msgs = {}
@@ -13,8 +16,11 @@ local function search_and_replace(original, replacements)
     local search_str = r.search or ""
     local replace_str = r.replace or ""
 
+    -- Escape special pattern chars to ensure literal matching:
+    local escaped_search = escape_lua_pattern(search_str)
+
     local replacement_count = 0
-    updated, replacement_count = updated:gsub(search_str, replace_str)
+    updated, replacement_count = updated:gsub(escaped_search, replace_str)
 
     -- If the string was not found, append an info message
     if replacement_count == 0 then
@@ -41,8 +47,8 @@ M.run = function(tool_call, conf, prompt_user_tool_accept, is_subpath, read_file
   if not path or #replacements == 0 then
     return "[replace_in_file] Missing 'path' or 'replacements'."
   end
-  local root = vim.fn.getcwd()
 
+  local root = vim.fn.getcwd()
   if not is_subpath(root, path) then
     return string.format("Tool [replace_in_file for '%s'] REJECTED. Path outside project root.", path)
   end