如何检查缓冲区是否为空？

Question

如何检查缓冲区是否为空？count-lines我认为检查是否为0是过度杀戮.

更新: 是的,菲尔斯的答案应该有效.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.