(defun insert-buffer (buffer)
  "在光标后插入 BUFFER 的全部内容。
在插入文本后设置标记。
BUFFER 可以是缓冲区或缓冲区名称。"
  (interactive "*bInsert buffer: ")

  (or (bufferp buffer)
      (setq buffer (get-buffer buffer)))
  (let (start end newmark)
    (save-excursion
      (save-excursion
        (set-buffer buffer)
        (setq start (point-min) end (point-max)))

      (insert-buffer-substring buffer start end)
      (setq newmark (point)))
    (push-mark newmark)))

(defun insert-buffer (buffer)
  "documentation..."
  (interactive "*bInsert buffer: ")
  body...)