add-log.el

;;; add-log.el --- change log maintenance commands for Emacs

;; Copyright (C) 1985, 86, 88, 93, 94, 1997 Free Software Foundation, Inc.

;; Keywords: tools

;; This file is part of GNU Emacs.

;; GNU Emacs is free software; you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation; either version 2, or (at your option)
;; any later version.

;; GNU Emacs is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
;; GNU General Public License for more details.

;; You should have received a copy of the GNU General Public License
;; along with GNU Emacs; see the file COPYING.  If not, write to the
;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
;; Boston, MA 02111-1307, USA.

;;; Commentary:

;; This facility is documented in the Emacs Manual.

;;; Code:

(defgroup change-log nil
  "Change log maintenance"
  :group 'tools
  :prefix "change-log-"
  :prefix "add-log-")


(defcustom change-log-default-name nil
  "*Name of a change log file for \\[add-change-log-entry]."
  :type '(choice (const :tag "default" nil)
		 string)
  :group 'change-log)

(defcustom add-log-current-defun-function nil
  "\
*If non-nil, function to guess name of current function from surrounding text.
\\[add-change-log-entry] calls this function (if nil, `add-log-current-defun'
instead) with no arguments.  It returns a string or nil if it cannot guess."
  :type 'function
  :group 'change-log)

;;;###autoload
(defcustom add-log-full-name nil
  "*Full name of user, for inclusion in ChangeLog daily headers.
This defaults to the value returned by the `user-full-name' function."
  :type '(choice (const :tag "Default" nil)
		 string)
  :group 'change-log)

;;;###autoload
(defcustom add-log-mailing-address nil
  "*Electronic mail address of user, for inclusion in ChangeLog daily headers.
This defaults to the value of `user-mail-address'."
  :type '(choice (const :tag "Default" nil)
		 string)
  :group 'change-log)

(defcustom add-log-time-format 'add-log-iso8601-time-string
  "*Function that defines the time format.
For example, `add-log-iso8601-time-string', which gives the
date in international ISO 8601 format,
and `current-time-string' are two valid values."
  :type '(radio (const :tag "International ISO 8601 format"
		       add-log-iso8601-time-string)
		(const :tag "Old format, as returned by `current-time-string'"
		       current-time-string)
		(function :tag "Other"))
  :group 'change-log)

(defcustom add-log-keep-changes-together nil
  "*If non-nil, then keep changes to the same file together.
If this variable is nil and you add log for (e.g.) two files,
the change log entries are added cumulatively to the beginning of log.
This is the old behaviour:

    Wday Mon DD TIME YYYY

	file A log2  << added this later
	file B log1
	File A log1

But if this variable is non-nil, then same file's changes are always kept
together.  Notice that Log2 has been appended and it is the most recent
for file A.

    Wday Mon DD TIME YYYY

	file B log1
	File A log1
	file A log2  << Added this later"
  :type 'boolean
  :group 'change-log)

(defvar change-log-font-lock-keywords
  '(;;
    ;; Date lines, new and old styles.
    ("^\\sw.........[0-9:+ ]*"
     (0 font-lock-string-face)
     ("\\([^<]+\\)<\\([A-Za-z0-9_.-]+@[A-Za-z0-9_.-]+\\)>" nil nil
      (1 font-lock-constant-face)
      (2 font-lock-variable-name-face)))
    ;;
    ;; File names.
    ("^\t\\* \\([^ ,:([\n]+\\)"
     (1 font-lock-function-name-face)
     ("\\=, \\([^ ,:([\n]+\\)" nil nil (1 font-lock-function-name-face)))
    ;;
    ;; Function or variable names.
    ("(\\([^) ,:\n]+\\)"
     (1 font-lock-keyword-face)
     ("\\=, *\\([^) ,:\n]+\\)" nil nil (1 font-lock-keyword-face)))
    ;;
    ;; Conditionals.
    ("\\[!?\\([^]\n]+\\)\\]\\(:\\| (\\)" (1 font-lock-variable-name-face))
    ;;
    ;; Acknowledgements.
    ("^\t\\(From\\|Patch\\(es\\)? by\\|Report\\(ed by\\| from\\)\\|Suggest\\(ed by\\|ion from\\)\\)"
     1 font-lock-comment-face)
    ("  \\(From\\|Patch\\(es\\)? by\\|Report\\(ed by\\| from\\)\\|Suggest\\(ed by\\|ion from\\)\\)"
     1 font-lock-comment-face))
  "Additional expressions to highlight in Change Log mode.")

(defvar change-log-mode-map nil
  "Keymap for Change Log major mode.")
(if change-log-mode-map
    nil
  (setq change-log-mode-map (make-sparse-keymap)))

(defvar change-log-time-zone-rule nil
  "Time zone used for calculating change log time stamps.
It takes the same format as the TZ argument of `set-time-zone-rule'.
If nil, use local time.")

(defun add-log-iso8601-time-zone (time)
  (let* ((utc-offset (or (car (current-time-zone time)) 0))
	 (sign (if (< utc-offset 0) ?- ?+))
	 (sec (abs utc-offset))
	 (ss (% sec 60))
	 (min (/ sec 60))
	 (mm (% min 60))
	 (hh (/ min 60)))
    (format (cond ((not (zerop ss)) "%c%02d:%02d:%02d")
		  ((not (zerop mm)) "%c%02d:%02d")
		  (t "%c%02d"))
	    sign hh mm ss)))

(defun add-log-iso8601-time-string ()
  (if change-log-time-zone-rule
      (let ((tz (getenv "TZ"))
	    (now (current-time)))
	(unwind-protect
	    (progn
	      (set-time-zone-rule
	       change-log-time-zone-rule)
	      (concat
	       (format-time-string "%Y-%m-%d " now)
	       (add-log-iso8601-time-zone now)))
	  (set-time-zone-rule tz)))
    (format-time-string "%Y-%m-%d")))

(defun change-log-name ()
  (or change-log-default-name
      (if (eq system-type 'vax-vms)
	  "$CHANGE_LOG$.TXT"
	"ChangeLog")))

;;;###autoload
(defun prompt-for-change-log-name ()
  "Prompt for a change log name."
  (let* ((default (change-log-name))
	 (name (expand-file-name
		(read-file-name (format "Log file (default %s): " default)
				nil default))))
    ;; Handle something that is syntactically a directory name.
    ;; Look for ChangeLog or whatever in that directory.
    (if (string= (file-name-nondirectory name) "")
	(expand-file-name (file-name-nondirectory default)
			  name)
      ;; Handle specifying a file that is a directory.
      (if (file-directory-p name)
	  (expand-file-name (file-name-nondirectory default)
			    (file-name-as-directory name))
	name))))

;;;###autoload
(defun find-change-log (&optional file-name)
  "Find a change log file for \\[add-change-log-entry] and return the name.

Optional arg FILE-NAME specifies the file to use.
If FILE-NAME is nil, use the value of `change-log-default-name'.
If 'change-log-default-name' is nil, behave as though it were 'ChangeLog'
\(or whatever we use on this operating system).

If 'change-log-default-name' contains a leading directory component, then
simply find it in the current directory.  Otherwise, search in the current
directory and its successive parents for a file so named.

Once a file is found, `change-log-default-name' is set locally in the
current buffer to the complete file name."
  ;; If user specified a file name or if this buffer knows which one to use,
  ;; just use that.
  (or file-name
      (setq file-name (and change-log-default-name
			   (file-name-directory change-log-default-name)
			   change-log-default-name))
      (progn
	;; Chase links in the source file
	;; and use the change log in the dir where it points.
	(setq file-name (or (and buffer-file-name
				 (file-name-directory
				  (file-chase-links buffer-file-name)))
			    default-directory))
	(if (file-directory-p file-name)
	    (setq file-name (expand-file-name (change-log-name) file-name)))
	;; Chase links before visiting the file.
	;; This makes it easier to use a single change log file
	;; for several related directories.
	(setq file-name (file-chase-links file-name))
	(setq file-name (expand-file-name file-name))
	;; Move up in the dir hierarchy till we find a change log file.
	(let ((file1 file-name)
	      parent-dir)
	  (while (and (not (or (get-file-buffer file1) (file-exists-p file1)))
		      (progn (setq parent-dir
				   (file-name-directory
				    (directory-file-name
				     (file-name-directory file1))))
			     ;; Give up if we are already at the root dir.
			     (not (string= (file-name-directory file1)
					   parent-dir))))
	    ;; Move up to the parent dir and try again.
	    (setq file1 (expand-file-name
			 (file-name-nondirectory (change-log-name))
			 parent-dir)))
	  ;; If we found a change log in a parent, use that.
	  (if (or (get-file-buffer file1) (file-exists-p file1))
	      (setq file-name file1)))))
  ;; Make a local variable in this buffer so we needn't search again.
  (set (make-local-variable 'change-log-default-name) file-name)
  file-name)



(defun change-log-add-make-room ()
  "Begin a new empty change log entry at point."
  ;; Delete excess empty lines; make just 2.
  ;;
  (while (and (not (eobp)) (looking-at "^\\s *$"))
    (delete-region (point) (save-excursion (forward-line 1) (point))))
  (insert "\n\n")
  (forward-line -2)
  (indent-relative-maybe)
  )

;;;###autoload
(defun add-change-log-entry (&optional whoami file-name other-window new-entry)
  "Find change log file and add an entry for today.
Optional arg WHOAMI (interactive prefix) non-nil means prompt for user
name and site.

Second arg is FILE-NAME of change log.  If nil, uses `change-log-default-name'.
Third arg OTHER-WINDOW non-nil means visit in other window.
Fourth arg NEW-ENTRY non-nil means always create a new entry at the front;
never append to an existing entry.  Today's date is calculated according to
`change-log-time-zone-rule' if non-nil, otherwise in local time."
  (interactive (list current-prefix-arg
		     (prompt-for-change-log-name)))
  (or add-log-full-name
      (setq add-log-full-name (user-full-name)))
  (or add-log-mailing-address
      (setq add-log-mailing-address user-mail-address))
  (if whoami
      (progn
	(setq add-log-full-name (read-input "Full name: " add-log-full-name))
	 ;; Note that some sites have room and phone number fields in
	 ;; full name which look silly when inserted.  Rather than do
	 ;; anything about that here, let user give prefix argument so that
	 ;; s/he can edit the full name field in prompter if s/he wants.
	(setq add-log-mailing-address
	      (read-input "Mailing address: " add-log-mailing-address))))
  (let ((defun (funcall (or add-log-current-defun-function
			    'add-log-current-defun)))
	today-end
	paragraph-end
	entry

	)
    (setq file-name (expand-file-name (find-change-log file-name)))

    ;; Set ENTRY to the file name to use in the new entry.
    (and buffer-file-name
	 ;; Never want to add a change log entry for the ChangeLog file itself.
	 (not (string= buffer-file-name file-name))
	 (setq entry (if (string-match
			  (concat "^" (regexp-quote (file-name-directory
						     file-name)))
			  buffer-file-name)
			 (substring buffer-file-name (match-end 0))
		       (file-name-nondirectory buffer-file-name))))

    (if (and other-window (not (equal file-name buffer-file-name)))
	(find-file-other-window file-name)
      (find-file file-name))
    (or (eq major-mode 'change-log-mode)
	(change-log-mode))
    (undo-boundary)
    (goto-char (point-min))
    (let ((new-entry (concat (funcall add-log-time-format)
			     "  " add-log-full-name
			     "  <" add-log-mailing-address ">")))
      (if (looking-at (regexp-quote new-entry))
	  (forward-line 1)
	(insert new-entry "\n\n")))

    ;; Search only within the first paragraph.
    (if (looking-at "\n*[^\n* \t]")
	(skip-chars-forward "\n")
      (forward-paragraph 1))
    (setq paragraph-end (point))
    (goto-char (point-min))

    ;; Today page's end point.  Used in search boundary

    (save-excursion
      (goto-char (point-min))	;Latest change log day
      (forward-line 1)
      (setq today-end
	    (if (re-search-forward "^[^ \t\n]" nil t) ;Seek to next day's hdr
		(match-beginning 0)
	      (point-max))))		;No next day, use point max

    ;; Now insert the new line for this entry.
    (cond ((re-search-forward "^\\s *\\*\\s *$" paragraph-end t)
	   ;; Put this file name into the existing empty entry.
	   (if entry
	       (insert entry))
	   )

	  ((and (not new-entry)
		(let (case-fold-search)
		  (re-search-forward
		   (concat (regexp-quote (concat "* " entry))
			   ;; Don't accept `foo.bar' when
			   ;; looking for `foo':
			   "\\(\\s \\|[(),:]\\)")
		   paragraph-end t)))
	   ;; Add to the existing entry for the same file.
	   (re-search-forward "^\\s *$\\|^\\s \\*")
	   (goto-char (match-beginning 0))
	   (change-log-add-make-room)
	   )

	  ;;  See if there is existing entry and append to it.
	  ;;  * file.txt:
	  ;;
	  ((and add-log-keep-changes-together ;enabled ?
		(re-search-forward (regexp-quote (concat "* " entry))
				   today-end t))
	   (re-search-forward "^\\s *$\\|^\\s \\*")
	   (goto-char (match-beginning 0))
	   (change-log-add-make-room)
	   )

	  (t
	   ;; Make a new entry.
	   (forward-line 1)
	   (while (looking-at "\\sW")
	     (forward-line 1))
	   (while (and (not (eobp)) (looking-at "^\\s *$"))
	     (delete-region (point) (save-excursion (forward-line 1) (point))))
	   (insert "\n\n\n")
	   (forward-line -2)
	   (indent-to left-margin)
	   (insert "* " (or entry ""))))
    ;; Now insert the function name, if we have one.
    ;; Point is at the entry for this file,
    ;; either at the end of the line or at the first blank line.
    (if defun
	(progn
	  ;; Make it easy to get rid of the function name.
	  (undo-boundary)
	  (insert (if (save-excursion
			(beginning-of-line 1)
			(looking-at "\\s *$"))
		      ""
		    " ")
		  "(" defun "): "))
      ;; No function name, so put in a colon unless we have just a star.
      (if (not (save-excursion
		 (beginning-of-line 1)
		 (looking-at "\\s *\\(\\*\\s *\\)?$")))
	  (insert ": ")))))

;;;###autoload
(defun add-change-log-entry-other-window (&optional whoami file-name)
  "Find change log file in other window and add an entry for today.
Optional arg WHOAMI (interactive prefix) non-nil means prompt for user
name and site.
Second arg is file name of change log.  \
If nil, uses `change-log-default-name'."
  (interactive (if current-prefix-arg
		   (list current-prefix-arg
			 (prompt-for-change-log-name))))
  (add-change-log-entry whoami file-name t))
;;;###autoload (define-key ctl-x-4-map "a" 'add-change-log-entry-other-window)

;;;###autoload
(defun change-log-mode ()
  "Major mode for editing change logs; like Indented Text Mode.
Prevents numeric backups and sets `left-margin' to 8 and `fill-column' to 74.
New log entries are usually made with \\[add-change-log-entry] or \\[add-change-log-before-other-window].
Each entry behaves as a paragraph, and the entries for one day as a page.
Runs `change-log-mode-hook'."
  (interactive)
  (kill-all-local-variables)
  (indented-text-mode)
  (setq major-mode 'change-log-mode
	mode-name "Change Log"
	left-margin 8
	fill-column 74
	indent-tabs-mode t
	tab-width 8)
  (use-local-map change-log-mode-map)
  (set (make-local-variable 'fill-paragraph-function)
       'change-log-fill-paragraph)
  ;; Let each entry behave as one paragraph:
  ;; We really do want "^" in paragraph-start below: it is only the lines that
  ;; begin at column 0 (despite the left-margin of 8) that we are looking for.
  (set (make-local-variable 'paragraph-start) "\\s *$\\|\f\\|^\\<")
  (set (make-local-variable 'paragraph-separate) "\\s *$\\|\f\\|^\\<")
  ;; Let all entries for one day behave as one page.
  ;; Match null string on the date-line so that the date-line
  ;; is grouped with what follows.
  (set (make-local-variable 'page-delimiter) "^\\<\\|^\f")
  (set (make-local-variable 'version-control) 'never)
  (set (make-local-variable 'adaptive-fill-regexp) "\\s *")
  (set (make-local-variable 'font-lock-defaults)
       '(change-log-font-lock-keywords t))
  (run-hooks 'change-log-mode-hook))

;; It might be nice to have a general feature to replace this.  The idea I
;; have is a variable giving a regexp matching text which should not be
;; moved from bol by filling.  change-log-mode would set this to "^\\s *\\s(".
;; But I don't feel up to implementing that today.
(defun change-log-fill-paragraph (&optional justify)
  "Fill the paragraph, but preserve open parentheses at beginning of lines.
Prefix arg means justify as well."
  (interactive "P")
  (let ((end (progn (forward-paragraph) (point)))
	(beg (progn (backward-paragraph) (point)))
	(paragraph-start (concat paragraph-start "\\|\\s *\\s(")))
    (fill-region beg end justify)
    t))

(defcustom add-log-current-defun-header-regexp
  "^\\([A-Z][A-Z_ ]*[A-Z_]\\|[-_a-zA-Z]+\\)[ \t]*[:=]"
  "*Heuristic regexp used by `add-log-current-defun' for unknown major modes."
  :type 'regexp
  :group 'change-log)

;;;###autoload
(defvar add-log-lisp-like-modes
    '(emacs-lisp-mode lisp-mode scheme-mode lisp-interaction-mode)
  "*Modes that look like Lisp to `add-log-current-defun'.")

;;;###autoload
(defvar add-log-c-like-modes
    '(c-mode c++-mode c++-c-mode objc-mode)
  "*Modes that look like C to `add-log-current-defun'.")

;;;###autoload
(defvar add-log-tex-like-modes
    '(TeX-mode plain-TeX-mode LaTeX-mode plain-tex-mode latex-mode)
  "*Modes that look like TeX to `add-log-current-defun'.")

;;;###autoload
(defun add-log-current-defun ()
  "Return name of function definition point is in, or nil.

Understands C, Lisp, LaTeX (\"functions\" are chapters, sections, ...),
Texinfo (@node titles), Perl, and Fortran.

Other modes are handled by a heuristic that looks in the 10K before
point for uppercase headings starting in the first column or
identifiers followed by `:' or `=', see variable
`add-log-current-defun-header-regexp'.

Has a preference of looking backwards."
  (condition-case nil
      (save-excursion
	(let ((location (point)))
	  (cond ((memq major-mode add-log-lisp-like-modes)
		 ;; If we are now precisely at the beginning of a defun,
		 ;; make sure beginning-of-defun finds that one
		 ;; rather than the previous one.
		 (or (eobp) (forward-char 1))
		 (beginning-of-defun)
		 ;; Make sure we are really inside the defun found, not after it.
		 (if (and (looking-at "\\s(")
			  (progn (end-of-defun)
				 (< location (point)))
			  (progn (forward-sexp -1)
				 (>= location (point))))
		     (progn
		       (if (looking-at "\\s(")
			   (forward-char 1))
		       (forward-sexp 1)
		       (skip-chars-forward " '")
		       (buffer-substring (point)
					 (progn (forward-sexp 1) (point))))))
		((and (memq major-mode add-log-c-like-modes)
		      (save-excursion
			(beginning-of-line)
			;; Use eq instead of = here to avoid
			;; error when at bob and char-after
			;; returns nil.
			(while (eq (char-after (- (point) 2)) ?\\)
			  (forward-line -1))
			(looking-at "[ \t]*#[ \t]*define[ \t]")))
		 ;; Handle a C macro definition.
		 (beginning-of-line)
		 (while (eq (char-after (- (point) 2)) ?\\) ;not =; note above
		   (forward-line -1))
		 (search-forward "define")
		 (skip-chars-forward " \t")
		 (buffer-substring (point)
				   (progn (forward-sexp 1) (point))))
		((memq major-mode add-log-c-like-modes)
		 (beginning-of-line)
		 ;; See if we are in the beginning part of a function,
		 ;; before the open brace.  If so, advance forward.
		 (while (not (looking-at "{\\|\\(\\s *$\\)"))
		   (forward-line 1))
		 (or (eobp)
		     (forward-char 1))
		 (beginning-of-defun)
		 (if (progn (end-of-defun)
			    (< location (point)))
		     (progn
		       (backward-sexp 1)
		       (let (beg tem)

			 (forward-line -1)
			 ;; Skip back over typedefs of arglist.
			 (while (and (not (bobp))
				     (looking-at "[ \t\n]"))
			   (forward-line -1))
			 ;; See if this is using the DEFUN macro used in Emacs,
			 ;; or the DEFUN macro used by the C library.
			 (if (condition-case nil
				 (and (save-excursion
					(end-of-line)
					(while (= (preceding-char) ?\\)
					  (end-of-line 2))
					(backward-sexp 1)
					(beginning-of-line)
					(setq tem (point))
					(looking-at "DEFUN\\b"))
				      (>= location tem))
			       (error nil))
			     (progn
			       (goto-char tem)
			       (down-list 1)
			       (if (= (char-after (point)) ?\")
				   (progn
				     (forward-sexp 1)
				     (skip-chars-forward " ,")))
			       (buffer-substring (point)
						 (progn (forward-sexp 1) (point))))
                           (if (looking-at "^[+-]")
                               (change-log-get-method-definition)
                             ;; Ordinary C function syntax.
                             (setq beg (point))
                             (if (and (condition-case nil
					  ;; Protect against "Unbalanced parens" error.
					  (progn
					    (down-list 1) ; into arglist
					    (backward-up-list 1)
					    (skip-chars-backward " \t")
					    t)
					(error nil))
				      ;; Verify initial pos was after
				      ;; real start of function.
				      (save-excursion
					(goto-char beg)
					;; For this purpose, include the line
					;; that has the decl keywords.  This
					;; may also include some of the
					;; comments before the function.
					(while (and (not (bobp))
						    (save-excursion
						      (forward-line -1)
						      (looking-at "[^\n\f]")))
					  (forward-line -1))
					(>= location (point)))
                                          ;; Consistency check: going down and up
                                          ;; shouldn't take us back before BEG.
                                          (> (point) beg))
				 (let (end middle)
				   ;; Don't include any final newline
				   ;; in the name we use.
				   (if (= (preceding-char) ?\n)
				       (forward-char -1))
				   (setq end (point))
				   (backward-sexp 1)
				   ;; Now find the right beginning of the name.
				   ;; Include certain keywords if they
				   ;; precede the name.
				   (setq middle (point))
				   (forward-word -1)
				   ;; Ignore these subparts of a class decl
				   ;; and move back to the class name itself.
				   (while (looking-at "public \\|private ")
				     (skip-chars-backward " \t:")
				     (setq end (point))
				     (backward-sexp 1)
				     (setq middle (point))
				     (forward-word -1))
				   (and (bolp)
					(looking-at "struct \\|union \\|class ")
					(setq middle (point)))
				   (buffer-substring middle end)))))))))
		((memq major-mode add-log-tex-like-modes)
		 (if (re-search-backward
		      "\\\\\\(sub\\)*\\(section\\|paragraph\\|chapter\\)" nil t)
		     (progn
		       (goto-char (match-beginning 0))
		       (buffer-substring (1+ (point));; without initial backslash
					 (progn
					   (end-of-line)
					   (point))))))
		((eq major-mode 'texinfo-mode)
		 (if (re-search-backward "^@node[ \t]+\\([^,\n]+\\)" nil t)
		     (buffer-substring (match-beginning 1)
				       (match-end 1))))
		((eq major-mode 'perl-mode)
		 (if (re-search-backward "^sub[ \t]+\\([^ \t\n]+\\)" nil t)
		     (buffer-substring (match-beginning 1)
				       (match-end 1))))
                ((eq major-mode 'fortran-mode)
                 ;; must be inside function body for this to work
                 (beginning-of-fortran-subprogram)
                 (let ((case-fold-search t)) ; case-insensitive
                   ;; search for fortran subprogram start
                   (if (re-search-forward
			 "^[ \t]*\\(program\\|subroutine\\|function\
\\|[ \ta-z0-9*]*[ \t]+function\\)"
			 nil t)
                       (progn
                         ;; move to EOL or before first left paren
                         (if (re-search-forward "[(\n]" nil t)
			     (progn (forward-char -1)
				    (skip-chars-backward " \t"))
			   (end-of-line))
			 ;; Use the name preceding that.
                         (buffer-substring (point)
                                           (progn (forward-sexp -1)
                                                  (point)))))))
		(t
		 ;; If all else fails, try heuristics
		 (let (case-fold-search)
		   (end-of-line)
		   (if (re-search-backward add-log-current-defun-header-regexp
					   (- (point) 10000)
					   t)
		       (buffer-substring (match-beginning 1)
					 (match-end 1))))))))
    (error nil)))

(defvar change-log-get-method-definition-md)

;; Subroutine used within change-log-get-method-definition.
;; Add the last match in the buffer to the end of `md',
;; followed by the string END; move to the end of that match.
(defun change-log-get-method-definition-1 (end)
  (setq change-log-get-method-definition-md
	(concat change-log-get-method-definition-md
		(buffer-substring (match-beginning 1) (match-end 1))
		end))
  (goto-char (match-end 0)))

;; For objective C, return the method name if we are in a method.
(defun change-log-get-method-definition ()
  (let ((change-log-get-method-definition-md "["))
    (save-excursion
      (if (re-search-backward "^@implementation\\s-*\\([A-Za-z_]*\\)" nil t)
	  (change-log-get-method-definition-1 " ")))
    (save-excursion
      (cond
       ((re-search-forward "^\\([-+]\\)[ \t\n\f\r]*\\(([^)]*)\\)?\\s-*" nil t)
	(change-log-get-method-definition-1 "")
	(while (not (looking-at "[{;]"))
	  (looking-at
	   "\\([A-Za-z_]*:?\\)\\s-*\\(([^)]*)\\)?[A-Za-z_]*[ \t\n\f\r]*")
	  (change-log-get-method-definition-1 ""))
	(concat change-log-get-method-definition-md "]"))))))


(provide 'add-log)

;;; add-log.el ends here