可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试):
问题:
I'm trying to use the interactive function name feature. On emacs lisp manual it says:
‘a’ A function name (i.e., a symbol satisfying fboundp). Existing, Completion, Prompt.
So I tried it with a small test code:
(defun testfun1 () (message "hello, world!")) (defun test (abcd) (interactive "aTheme name: ") (abcd))
Emacs gives an error saying,
test: Symbol's function definition is void: abcd
I tried to test abcd with fboundp, it returns t. So I'm quite confused about how to use the 'a' option in interactive. Any body can give some hints?
回答1:
Your function test receives its argument abcd as a function, but you can't just invoke a function by putting a symbol referencing it in the first position of a list to be evaluated. Since Emacs Lisp is a Lisp-2, the reference to the function provided to the interactive query is stored in symbol abcd's value slot, not its function slot. The evaluation rules for a list like
(abcd)
involve looking in the first object's function slot if that object is a symbol, which it is in your case. If instead you wish to invoke a function referenced in a symbol's value slot, you need the funcall function:
(funcall abcd)
That says, "Take abcd, grab the value out of its value slot, and, provided it's a function, call it here, just as we would have if that function had been referenced in the list's first position either in a symbol's function slot or by a direct reference to the function object."
Here's an answer to a similar question with references useful to allow you probe further.
回答2:
This should do this trick:
(defun test (abcd) (interactive "aTheme name: ") (call-interactively abcd))
