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+;;; ============ 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, 1986, 1988, 1993, 1994 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 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:
+
+(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