emacs - elisp mapcar + lambda + defmacro 帮助

Question

我正在尝试使用宏生成函数:

(defmacro make-my-emacs-command-region (cmd name)
  (list 'defun (intern (format "my-emacs-command-%s-%s" cmd name))
        '(&optional arg)
        (list 'interactive "p")
        (list (intern (format "mark-%s" name)) 'arg)
        (list (intern (format "my-emacs-command-%s-region" cmd))
              '(region-beginning) '(region-end))))

生成器:

(mapcar (lambda (a) (make-my-emacs-command-region a buffer))
        '(foo bar))

但是我得到:

my-emacs-command-a-buffer

我做错了什么？如何强制传递 a 的值？

Answer 1

lisp 宏的一个要点是参数不 求值。阅读 macro pages in the manual ，特别是 expansion of macros . macroexpand 函数可用于调试问题。另外，backquote可能会帮助您更简洁地编写宏的主体。