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如何修改Elisp函数中的docstring

 4 years ago
source link: https://www.lujun9972.win/blog/2017/03/02/%E5%A6%82%E4%BD%95%E4%BF%AE%E6%94%B9elisp%E5%87%BD%E6%95%B0%E4%B8%AD%E7%9A%84docstring/index.html
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如何修改Elisp函数中的docstring

Elisp提供了 documentation 函数可以用来获取另一个函数的docstring,然而可惜它是不能通过 setf 修改的: 

(defun foo ()
  "Old Docstring")
(documentation 'foo)
;; =>"Old Docstring"

(fset (documentation 'foo) "New Docstring")
;; Debugger entered--Lisp error: (wrong-type-argument symbolp "Old Docstring")

不过有一个比较hack的方法,就是修改symbol的 function-documentation 属性. 它的优先级要高于函数本身存储的docstring 

(put 'foo 'function-documentation "New Docstring")
(documentation 'foo)
;; =>"New Docstring"

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