自动在c++中插入成员函数 （emacs 扩展）
总算花了几天功夫看了一下elisp语言，括号看得头晕，安耐不住写了一个elisp扩展，现在感觉看一般简单的lisp也不是那么痛苦了。
用法：可以在c++头文件中，将光标放在当前函数行，然后按C-c i在对应的源文件中插入成员函数。
支持多层namespace 和 class。不过还不是十分可靠，例如对默认参数值的支持等。
(defun cpp-current-scope()
"If the point is in a class/namespace/struct definition, gets the
full scope path. Return nil otherwise."
(interactive)
(let (syntax-list scope ( classnames ()))
(save-excursion
;;ensure we aren't in the arguments list
(beginning-of-line)
(c-end-of-statement)
(c-beginning-of-statement-1)
;;now point is at beginning of the funciton declaration,
;;call c-guest-basic-syntax to find if the car is inclass or innamespace
(setq syntax-list (c-guess-basic-syntax))
;;expected format ' ( (inclass 12) | (innamespace 22) ...))
(while (or (eq 'inclass (car (car syntax-list)))
(eq 'innamespace (car (car syntax-list))))
;; find outside the class / namespace name
(goto-char (elt (car syntax-list) 1))
(backward-word)
(setq classnames (cons (current-word) classnames))
;;while loop, check outside scope again
(setq syntax-list (c-guess-basic-syntax)))
;;concat the scope list like ns1::ns2::class1::
(dolist (e classnames scope)
(setq scope (concat scope e "::"))))))
(defun cpp-current-function()
"check current line functon declaration, return a list, the 0th is the
rettype, 1st is function name,
2th is the arg list, 3th is modifier
such as '('void' 'foo' 'int a, int b' 'const' )"
(interactive)
(save-excursion
(let (string list rettype func argument (modifier "")
start end)
(beginning-of-line)
(setq end (progn (c-end-of-statement) (point)))
(setq start (progn (c-beginning-of-statement-1) (point)))
(when (search-forward "(" end t)
(setq string (buffer-substring-no-properties start (1- (point))))
(setq start (point))
(when (search-forward ")" end t)
(setq argument (buffer-substring-no-properties start (1- (point))))
(setq modifier (buffer-substring-no-properties (point) (1- end)))
(setq list (split-string string))
(setq func (elt list (1- (length list))))
(if (> (length list) 2)
(setq rettype (elt list 1))
(if (= (length list) 1)
;;no rettype, construction or destruction
(setq rettype "")
(setq rettype (car list))))
(setq list (list rettype func argument modifier)))))))
(defun cpp-insert-new-method ()
"Insert a c++ member function definition into the corresponding c++ source file.
try to find the definition if exists"
(interactive)
(let (insertstr (classname (cpp-current-scope))
(phototype (cpp-current-function)))
(if (or (null classname) (null phototype))
(message "Cann't insert cpp member function!")
(ff-find-related-file)
(setq insertstr (concat
(elt phototype 0)
(unless (string= "" (elt phototype 0)) " ")
classname
(elt phototype 1) "(" (elt phototype 2) ")"
(elt phototype 3)))
(beginning-of-buffer)
(unless (search-forward insertstr (point-max) t)
(end-of-buffer)
(insert "\n\n")
(end-of-buffer)
(insert insertstr)
(insert "\n{\n")
(c-indent-defun)
(insert "}\n")
(backward-char 3)
(insert "\n")
(c-indent-line-or-region)))))
(global-set-key "\C-ci" 'cpp-insert-new-method)