Add header and footer.

reference-user-comment.el

;;; reference-user-comment.el --- get user comment
;; This program is free software
;;; Installation
;;
;; install-elisp RET https://gist.github.com/sanryuu/7809739/raw/d5cb7ef253cc75d58e6cd97d3d99e055e7f87d0c/reference-user-comment.el RET
;; C-c C-c
;;
;; Put the following to your ~/.emacs startup file.
;;
;; (require 'reference-user-comment)
;; (global-set-key "\C-c\C-r" 'ruc-reference-document)

;;; Commentary:
;;; Code:

(require 'popup)
(require 'gtags)

(defun ruc-reference-document ()
 "This function display document comment
from user defined function
@return (popup) document"
 (interactive)
 (let (current-point func-name defined-files selected)
   (setq current-point (point))
   (setq func-name (gtags-current-token))
   (setq defined-files (ruc-find-tag-list func-name))
   (goto-char current-point)
   (when (not (equal nil defined-files))
     (setq selected (popup-menu* defined-files))

     )
   (popup-tip
    (ruc-replace-comment-symbol
     (ruc-get-document-from-file selected func-name))
    :scroll-bar t :margin t)
   ))

(defun ruc-get-document-from-file (file function)
 "get document function explain from file
return: string document, or nil"
 (let (point-define
       point-plural-comment-begin
       point-plural-comment-end
       point-oneline-comment-begin
       point-oneline-comment-end
       point-comment-begin
       point-comment-end)
 (with-temp-buffer
   (insert-file-contents file)
   (goto-char (point-max))
   ;; 関数の定義位置の取得
   (re-search-backward
    (format "function.*%s *(" function)
    nil t nil)
   (setq point-define (point))
   ;; /* */形式の一番近いコメント終了位置
   (if (not (equal nil (re-search-backward "\\*/" nil t nil)))
       (setq point-plural-comment-end (+ (point) 2)) ;"*/"の分だけ戻る
     (setq point-plural-comment-end (point-min)))
   ;; /* */形式の一番近いコメント開始位置
   (if (not (equal nil (re-search-backward "/\\*" nil t nil)))
       (setq point-plural-comment-begin (point))
     (setq point-plural-comment-end (point-min)))
   ;; //形式の一番近いコメント終了位置
   (goto-char point-define)
   (cond ((not (equal nil (re-search-backward "//" nil t nil)))
          (re-search-forward "\n" nil t nil)
          (forward-char -1) ;; "\n"の分だけ戻る
          (setq point-oneline-comment-end (point))
          ;; //形式の一番近いコメント開始位置
          (while (ruc-include-oneline-comment-p
                  (buffer-substring-line (line-number-at-pos)
                                         (+ 1 (line-number-at-pos))))
            (previous-line))
          (re-search-forward "//" nil t nil)
          (setq point-oneline-comment-begin (- (point) 2)))
         (t
          (setq point-oneline-comment-end (point-min)))
         )
   ;; /* */形式と//形式 の定義位置から近い方を開始位置に
   (cond ((< point-plural-comment-end point-oneline-comment-end)
       (setq point-comment-begin point-oneline-comment-begin)
       (setq point-comment-end   point-oneline-comment-end))
       (t
       (setq point-comment-begin point-plural-comment-begin)
       (setq point-comment-end   point-plural-comment-end)))
   ;; 関数定義の上に2行以上差があった場合には、ドキュメントとみなさない。
   (if (>= 2 (- (count-lines (point-max) point-comment-end)
                (count-lines (point-max) point-define)))
       (setq document-doc
             (buffer-substring-no-properties
              point-comment-begin point-comment-end))
     (setq document-doc "No Document")))))


(defun ruc-find-tag-list (function-name)
 "find function define file list.
Using global command.
return: (list) file-name
       (list \"sample1.php\" \"sample2.php\")"
 (interactive)
 (setq global-command-result
       (shell-command-to-string
        (format "global %s" function-name)))
 (setq finded-tag-lists '())
 (when (not (equal "" global-command-result))
   (when (not (string-match "GTAGS not found." global-command-result))
     (setq finded-tag-lists
           (split-string
            (substring global-command-result 0 -1)
            "\n"))
     )
   )
 finded-tag-lists)

;; 行数指定でバッファの部分文字列を取得する
(defun buffer-substring-line (begin-line end-line)
 "buffer-substring at line designation
return: (string) buffer substring from line number
begin-line: begin line numberfor substring
end-line:   end line number for substring
use: (buffer-substring-line 1 2)"
 (interactive)
 (let (current-point current-line-point upper-line-point buffer-string)
   (setq current-point (point))
   (goto-line begin-line)
   (setq current-line-point (point))
   (goto-line end-line)
   (setq upper-line-point (- (point) 1))
   (setq buffer-string (buffer-substring-no-properties
                        current-line-point upper-line-point))
   (goto-char current-point)
   buffer-string
   ))

;; コメント識別記号の削除
(defun ruc-replace-comment-symbol (taget)
 "replace comment symbol from string
taget (string) replace-taget
return: params"
 (interactive)
 (replace-regexp-in-string "^\s*/?\\**/?\n??" "" taget))

(defun ruc-include-oneline-comment-p (string)
 "judge oneline comment is included
return bool
use: (ruc-include-oneline-comment-p \" // \") ;=> t
use: (ruc-include-oneline-comment-p \" abcd \") ;=> nil"
 (not (equal nil (string-match "//" string))))

(provide 'reference-user-comment)
;;; reference-user-comment ends here