Pretty print macro expansion

在*scratch* buffer里面运行macroexpand展开宏后的程序全在一行，不好读，使用pp可以获得更好的效果。

(defun wl-pp-macroexpand-at-point ()
  (interactive)
  (pp-eval-expression '(macroexpand (read (thing-at-point 'sexp)))))

(define-key emacs-lisp-mode-map (kbd "C-c C-c") 'wl-pp-macroexpand-at-point)

将光标放在想要展开的宏调用的左括号前，调用该程序，宏展开的结果显示在*Pp Eval Output* buffer里。

如果想看宏调用执行后的结果，可以使用下面的函数。

(defun wl-pp-evaluate-at-point ()
  (interactive)
  (pp-eval-expression (macroexpand (read (thing-at-point 'sexp)))))

(define-key emacs-lisp-mode-map (kbd "C-c C-e") 'wl-pp-evaluate-at-point)