etc/add-log.el - binutils-gdb - Git at Google

 ;;; ============ NOTE WELL! =============
 ;;;
 ;;; You only need to use this file if you're using a version of Emacs
 ;;; prior to 20.1 to work on GDB.  The only difference between this
 ;;; and the standard add-log.el provided with 19.34 is that it
 ;;; generates dates using the terser format used by Emacs 20.  This is
 ;;; the format recommended for use in GDB ChangeLogs.
 ;;;
 ;;; To use this code, you should create a directory `~/elisp', save the code
 ;;; below in `~/elisp/add-log.el', and then put something like this in
 ;;; your `~/.emacs' file, to tell Emacs where to find it:
 ;;;
 ;;; (setq load-path
 ;;;       (cons (expand-file-name "~/elisp")
 ;;;             load-path))
 ;;;
 ;;; If you want, you can also byte-compile it --- it'll run a little
 ;;; faster, and use a little less memory.  (Not that those matter much for
 ;;; this file.)  To do that, after you've saved the text as
 ;;; ~/elisp/add-log.el, bring it up in Emacs, and type
 ;;;
 ;;;     C-u M-x byte-compile-file
 ;;;
 ;;; --- Jim Blandy

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

 ;; Copyright (C) 1985-2023 Free Software Foundation, Inc.

 ;; Keywords: maint

 ;; 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 this program; if not, write to the Free Software
 ;; Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
 ;; MA 02110-1301, USA.

 ;;; Commentary:

 ;; This facility is documented in the Emacs Manual.

 ;;; Code:

 (defvar change-log-default-name nil
   "*Name of a change log file for \\[add-change-log-entry].")

 (defvar 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.")

 ;;;###autoload
 (defvar 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.")

 ;;;###autoload
 (defvar 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'.")

 (defvar change-log-font-lock-keywords
   '(("^[SMTWF].+" . font-lock-function-name-face)	; Date line.
     ("^\t\\* \\([^ :\n]+\\)" 1 font-lock-comment-face)	; File name.
     ("(\\([^)\n]+\\)):" 1 font-lock-keyword-face))	; Function name.
   "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))
   (define-key change-log-mode-map "\M-q" 'change-log-fill-paragraph))

 (defun change-log-name ()
   (or change-log-default-name
       (if (eq system-type 'vax-vms)
 	  "$CHANGE_LOG$.TXT"
 	(if (or (eq system-type 'ms-dos) (eq system-type 'windows-nt))
 	    "changelo"
 	  "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)

 ;;;###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 (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."
   (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)))
 	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 ((heading (format "%s  %s  <%s>"
 			   (format-time-string "%Y-%m-%d")
 			   add-log-full-name
 			   add-log-mailing-address)))
       (if (looking-at (regexp-quote heading))
 	  (forward-line 1)
 	(insert heading "\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))

     ;; 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))
 	   ;; Delete excess empty lines; make just 2.
 	   (while (and (not (eobp)) (looking-at "^\\s *$"))
 	     (delete-region (point) (save-excursion (forward-line 1) (point))))
 	   (insert "\n\n")
 	   (forward-line -2)
 	   (indent-relative-maybe))
 	  (t
 	   ;; Make a new entry.
 	   (forward-line 1)
 	   (while (looking-at "\\sW")
 	     (forward-line 1))
 	   (while (and (not (eobp)) (looking-at "^\\s *$"))
 	     (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 (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-entry-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)
   ;; 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 *$\\|\f\\|^\\sw")
   (set (make-local-variable 'paragraph-separate) "\\s *$\\|\f\\|^\\sw")
   ;; 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 (save-excursion (forward-paragraph) (point)))
 	(beg (save-excursion (backward-paragraph)(point)))
 	(paragraph-start (concat paragraph-start "\\|\\s *\\s(")))
     (fill-region beg end justify)))

 (defvar 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.")

 ;;;###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 '(emacs-lisp-mode lisp-mode scheme-mode
 						    lisp-interaction-mode))
 		 ;; 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 '(c-mode c++-mode c++-c-mode objc-mode))
 		      (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 '(c-mode c++-mode c++-c-mode objc-mode))
 		 (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 "^[+-]")
                                (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
 		       '(TeX-mode plain-TeX-mode LaTeX-mode;; tex-mode.el
 				  plain-tex-mode latex-mode;; cmutex.el
 				  ))
 		 (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 get-method-definition-md)

 ;; Subroutine used within 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 get-method-definition-1 (end)
   (setq get-method-definition-md
 	(concat 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 get-method-definition ()
   (let ((get-method-definition-md "["))
     (save-excursion
       (if (re-search-backward "^@implementation\\s-*\\([A-Za-z_]*\\)" nil t)
 	  (get-method-definition-1 " ")))
     (save-excursion
       (cond
        ((re-search-forward "^\\([-+]\\)[ \t\n\f\r]*\\(([^)]*)\\)?\\s-*" nil t)
 	(get-method-definition-1 "")
 	(while (not (looking-at "[{;]"))
 	  (looking-at
 	   "\\([A-Za-z_]*:?\\)\\s-*\\(([^)]*)\\)?[A-Za-z_]*[ \t\n\f\r]*")
 	  (get-method-definition-1 ""))
 	(concat get-method-definition-md "]"))))))


 (provide 'add-log)

 ;;; add-log.el ends here
	;;; ============ NOTE WELL! =============
	;;;
	;;; You only need to use this file if you're using a version of Emacs
	;;; prior to 20.1 to work on GDB. The only difference between this
	;;; and the standard add-log.el provided with 19.34 is that it
	;;; generates dates using the terser format used by Emacs 20. This is
	;;; the format recommended for use in GDB ChangeLogs.
	;;;
	;;; To use this code, you should create a directory `~/elisp', save the code
	;;; below in `~/elisp/add-log.el', and then put something like this in
	;;; your `~/.emacs' file, to tell Emacs where to find it:
	;;;
	;;; (setq load-path
	;;; (cons (expand-file-name "~/elisp")
	;;; load-path))
	;;;
	;;; If you want, you can also byte-compile it --- it'll run a little
	;;; faster, and use a little less memory. (Not that those matter much for
	;;; this file.) To do that, after you've saved the text as
	;;; ~/elisp/add-log.el, bring it up in Emacs, and type
	;;;
	;;; C-u M-x byte-compile-file
	;;;
	;;; --- Jim Blandy

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

	;; Copyright (C) 1985-2023 Free Software Foundation, Inc.

	;; Keywords: maint

	;; 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 this program; if not, write to the Free Software
	;; Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
	;; MA 02110-1301, USA.

	;;; Commentary:

	;; This facility is documented in the Emacs Manual.

	;;; Code:

	(defvar change-log-default-name nil
	"*Name of a change log file for \\[add-change-log-entry].")

	(defvar 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.")

	;;;###autoload
	(defvar 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.")

	;;;###autoload
	(defvar 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'.")

	(defvar change-log-font-lock-keywords
	'(("^[SMTWF].+" . font-lock-function-name-face) ; Date line.
	("^\t\\* \\([^ :\n]+\\)" 1 font-lock-comment-face) ; File name.
	("(\\([^)\n]+\\)):" 1 font-lock-keyword-face)) ; Function name.
	"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))
	(define-key change-log-mode-map "\M-q" 'change-log-fill-paragraph))

	(defun change-log-name ()
	(or change-log-default-name
	(if (eq system-type 'vax-vms)
	"$CHANGE_LOG$.TXT"
	(if (or (eq system-type 'ms-dos) (eq system-type 'windows-nt))
	"changelo"
	"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)

	;;;###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 (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."
	(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)))
	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 ((heading (format "%s %s <%s>"
	(format-time-string "%Y-%m-%d")
	add-log-full-name
	add-log-mailing-address)))
	(if (looking-at (regexp-quote heading))
	(forward-line 1)
	(insert heading "\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))

	;; 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 $\\\|^\\s \\")
	(goto-char (match-beginning 0))
	;; Delete excess empty lines; make just 2.
	(while (and (not (eobp)) (looking-at "^\\s *$"))
	(delete-region (point) (save-excursion (forward-line 1) (point))))
	(insert "\n\n")
	(forward-line -2)
	(indent-relative-maybe))
	(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 (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-entry-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)
	;; 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 *$\\\|\f\\\|^\\sw")
	(set (make-local-variable 'paragraph-separate) "\\s *$\\\|\f\\\|^\\sw")
	;; 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 (save-excursion (forward-paragraph) (point)))
	(beg (save-excursion (backward-paragraph)(point)))
	(paragraph-start (concat paragraph-start "\\\|\\s *\\s(")))
	(fill-region beg end justify)))

	(defvar 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.")

	;;;###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 '(emacs-lisp-mode lisp-mode scheme-mode
	lisp-interaction-mode))
	;; 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 '(c-mode c++-mode c++-c-mode objc-mode))
	(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 '(c-mode c++-mode c++-c-mode objc-mode))
	(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 "^[+-]")
	(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
	'(TeX-mode plain-TeX-mode LaTeX-mode;; tex-mode.el
	plain-tex-mode latex-mode;; cmutex.el
	))
	(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 get-method-definition-md)

	;; Subroutine used within 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 get-method-definition-1 (end)
	(setq get-method-definition-md
	(concat 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 get-method-definition ()
	(let ((get-method-definition-md "["))
	(save-excursion
	(if (re-search-backward "^@implementation\\s-\\([A-Za-z_]\\)" nil t)
	(get-method-definition-1 " ")))
	(save-excursion
	(cond
	((re-search-forward "^\\([-+]\\)[ \t\n\f\r]\\(([^)])\\)?\\s-*" nil t)
	(get-method-definition-1 "")
	(while (not (looking-at "[{;]"))
	(looking-at
	"\\([A-Za-z_]:?\\)\\s-\\(([^)])\\)?[A-Za-z_][ \t\n\f\r]*")
	(get-method-definition-1 ""))
	(concat get-method-definition-md "]"))))))


	(provide 'add-log)

	;;; add-log.el ends here