如何检查缓冲区是否为空？

Question

如何检查缓冲区是否为空？检查count-lines给出0是否过度杀死我认为。

更新 是的，菲尔斯的回答应该有效。把它写出来：

(defun buffer-empty-p (&optional buffer)
  (= (buffer-size buffer) 0))

Answer 1

buffer-size is a built-in function in `C source code'.

(buffer-size &optional BUFFER)

Return the number of characters in the current buffer.
If BUFFER, return the number of characters in that buffer instead.