feat: also allow the config file without dot, give an error message at search replace if search was not found in file

lua/chatgpt_nvim/config.lua

@@ -4,6 +4,7 @@ local uv = vim.loop
 local ok_yaml, lyaml = pcall(require, "lyaml")
 local prompts = require("chatgpt_nvim.prompts")
 
+-- Determines the Git root or fallback directory.
 local function get_project_root()
   local current_file = vim.fn.expand("%:p")
   local root_dir
@@ -28,14 +29,30 @@ local function get_project_root()
   return root_dir
 end
 
+-- Attempt to locate either .chatgpt_config.yaml or chatgpt_config.yaml, returning whichever exists first.
 local function get_config_path()
   local root = get_project_root()
-  return root .. "/.chatgpt_config.yaml"
+  local dot_config = root .. "/.chatgpt_config.yaml"
+  local non_dot_config = root .. "/chatgpt_config.yaml"
+
+  local dot_fd = uv.fs_open(dot_config, "r", 438)
+  if dot_fd then
+    uv.fs_close(dot_fd)
+    return dot_config
+  end
+
+  local non_dot_fd = uv.fs_open(non_dot_config, "r", 438)
+  if non_dot_fd then
+    uv.fs_close(non_dot_fd)
+    return non_dot_config
+  end
+
+  return nil
 end
 
 function M.load()
+  -- Attempt to find either config file, else fallback
   local path = get_config_path()
-  local fd = uv.fs_open(path, "r", 438)
   local config = {
     initial_prompt = "",
     directories = { "." },
@@ -62,10 +79,22 @@ function M.load()
     }
   }
 
+  -- If no config file found, alert user and return default config
+  if not path then
+    config.initial_prompt = "You are a coding assistant who receives a project's context and user instructions..."
+    vim.notify(
+      "No config file found (tried .chatgpt_config.yaml, chatgpt_config.yaml). Using defaults.",
+      vim.log.levels.WARN
+    )
+    return config
+  end
+
+  local fd = uv.fs_open(path, "r", 438)
   if fd then
     local stat = uv.fs_fstat(fd)
     local data = uv.fs_read(fd, stat.size, 0)
     uv.fs_close(fd)
+
     if data and ok_yaml then
       local ok, result = pcall(lyaml.load, data)
       if ok and type(result) == "table" then
@@ -109,7 +138,6 @@ function M.load()
           config.enable_step_by_step = result.enable_step_by_step
         end
 
-        -- auto_lint controls whether we do LSP-based checks
         if type(result.auto_lint) == "boolean" then
           config.auto_lint = result.auto_lint
         end