fix(#1939): fix the logic of ignore-checking, prefer to call the git check-ignore for git repos (#2383)

lua/avante/llm_tools/helpers.lua

@@ -72,7 +72,7 @@ end
 
 ---@param abs_path string
 ---@return boolean
-function M.is_ignored(abs_path)
+local function old_is_ignored(abs_path)
   local project_root = Utils.get_project_root()
   local gitignore_path = project_root .. "/.gitignore"
   local gitignore_patterns, gitignore_negate_patterns = Utils.parse_gitignore(gitignore_path)
@@ -84,6 +84,28 @@ function M.is_ignored(abs_path)
   return Utils.is_ignored(rel_path, gitignore_patterns, gitignore_negate_patterns)
 end
 
+---@param abs_path string
+---@return boolean
+function M.is_ignored(abs_path)
+  local project_root = Utils.get_project_root()
+  local cmd =
+    string.format("git -C %s check-ignore %s", vim.fn.shellescape(project_root), vim.fn.shellescape(abs_path))
+
+  local result = vim.fn.system(cmd)
+  local exit_code = vim.v.shell_error
+
+  -- If command failed or git is not available, fall back to old method
+  if exit_code ~= 0 and exit_code ~= 1 then return old_is_ignored(abs_path) end
+
+  -- Check if result indicates this is not a git repository
+  if result:sub(1, 26) == "fatal: not a git repository" then return old_is_ignored(abs_path) end
+
+  -- git check-ignore returns:
+  -- - exit code 0 and outputs the path if the file is ignored
+  -- - exit code 1 and no output if the file is not ignored
+  return exit_code == 0
+end
+
 ---@param abs_path string
 ---@return boolean
 function M.has_permission_to_access(abs_path)