Keyword added and FSF specified as Maintainer.
[bpt/emacs.git] / lisp / add-log.el
index faa46cc..61a29be 100644 (file)
@@ -1,8 +1,9 @@
 ;;; add-log.el --- change log maintenance commands for Emacs
 
-;; Copyright (C) 1985, 1986, 1988, 1993, 1994 Free Software Foundation, Inc.
+;; Copyright (C) 1985, 86, 88, 93, 94, 97, 98, 2000 Free Software Foundation, Inc.
 
-;; Keywords: maint
+;; Maintainer: FSF
+;; Keywords: tools
 
 ;; This file is part of GNU Emacs.
 
@@ -17,8 +18,9 @@
 ;; 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, 675 Mass Ave, Cambridge, MA 02139, USA.
+;; 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:
 
 
 ;;; Code:
 
-(defvar change-log-default-name nil
-  "*Name of a change log file for \\[add-change-log-entry].")
+(eval-when-compile
+  (require 'timezone))
 
-(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.")
+(defgroup change-log nil
+  "Change log maintenance"
+  :group 'tools
+  :link '(custom-manual "(emacs)Change Log")
+  :prefix "change-log-"
+  :prefix "add-log-")
 
-(defvar add-log-full-name nil
+
+(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 change-log-mode-hook nil
+  "Normal hook run by `change-log-mode'."
+  :type 'hook
+  :group 'change-log)
+
+(defcustom add-log-current-defun-function nil
+  "*If non-nil, function to guess name of surrounding function.
+It is used by `add-log-current-defun' in preference to built-in rules.
+Returns function's name as a string, or nil if outside a function."
+  :type '(choice (const nil) 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.")
+This defaults to the value returned by the function `user-full-name'."
+  :type '(choice (const :tag "Default" nil)
+                string)
+  :group 'change-log)
 
-(defvar add-log-mailing-address nil
+;;;###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'.")
+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, normally keep day's log entries for one file together.
+
+Log entries for a given file made with \\[add-change-log-entry] or
+\\[add-change-log-entry-other-window] will only be added to others \
+for that file made
+today if this variable is non-nil or that file comes first in today's
+entries.  Otherwise another entry for that file will be started.  An
+original log:
+
+       * foo (...): ...
+       * bar (...): change 1
+
+in the latter case, \\[add-change-log-entry-other-window] in a \
+buffer visiting `bar', yields:
+
+       * bar (...): -!-
+       * foo (...): ...
+       * bar (...): change 1
+
+and in the former:
+
+       * foo (...): ...
+       * bar (...): change 1
+       (...): -!-
+
+The NEW-ENTRY arg to `add-change-log-entry' can override the effect of
+this variable."
+  :version "20.3"
+  :type 'boolean
+  :group 'change-log)
+
+(defcustom add-log-buffer-file-name-function nil
+  "*If non-nil, function to call to identify the full filename of a buffer.
+This function is called with no argument.  If this is nil, the default is to
+use `buffer-file-name'."
+  :type '(choice (const nil) function)
+  :group 'change-log)
+
+(defcustom add-log-file-name-function nil
+  "*If non-nil, function to call to identify the filename for a ChangeLog entry.
+This function is called with one argument, the value of variable
+`buffer-file-name' in that buffer.  If this is nil, the default is to
+use the file's name relative to the directory of the change log file."
+  :type '(choice (const nil) function)
+  :group 'change-log)
+
+
+(defcustom change-log-version-info-enabled nil
+  "*If non-nil, enable recording version numbers with the changes."
+  :version "21.1"
+  :type 'boolean
+  :group 'change-log)
+
+(defcustom change-log-version-number-regexp-list
+  (let ((re    "\\([0-9]+\.[0-9.]+\\)"))
+    (list
+     ;;  (defconst ad-version "2.15"
+     (concat "^(def[^ \t\n]+[ \t]+[^ \t\n][ \t]\"" re)
+     ;; Revision: pcl-cvs.el,v 1.72 1999/09/05 20:21:54 monnier Exp
+     (concat "^;+ *Revision: +[^ \t\n]+[ \t]+" re)))
+  "*List of regexps to search for version number.
+The version number must be in group 1.
+Note: The search is conducted only within 10%, at the beginning of the file."
+  :version "21.1"
+  :type '(repeat regexp)
+  :group 'change-log)
+
+(defface change-log-date-face
+  '((t (:inherit font-lock-string-face)))
+  "Face used to highlight dates in date lines."
+  :version "21.1"
+  :group 'change-log)
+
+(defface change-log-name-face
+  '((t (:inherit font-lock-constant-face)))
+  "Face for highlighting author names."
+  :version "21.1"
+  :group 'change-log)
+
+(defface change-log-email-face
+  '((t (:inherit font-lock-variable-name-face)))
+  "Face for highlighting author email addresses."
+  :version "21.1"
+  :group 'change-log)
+
+(defface change-log-file-face
+  '((t (:inherit font-lock-function-name-face)))
+  "Face for highlighting file names."
+  :version "21.1"
+  :group 'change-log)
+
+(defface change-log-list-face
+  '((t (:inherit font-lock-keyword-face)))
+  "Face for highlighting parenthesized lists of functions or variables."
+  :version "21.1"
+  :group 'change-log)
+  
+(defface change-log-conditionals-face
+  '((t (:inherit font-lock-variable-name-face)))
+  "Face for highlighting conditionals of the form `[...]'."
+  :version "21.1"
+  :group 'change-log)
+
+(defface change-log-function-face
+  '((t (:inherit font-lock-variable-name-face)))
+  "Face for highlighting items of the form `<....>'."
+  :version "21.1"
+  :group 'change-log)
+
+(defface change-log-acknowledgement-face
+  '((t (:inherit font-lock-comment-face)))
+  "Face for highlighting acknowledgments."
+  :version "21.1"
+  :group 'change-log)
+
+(defvar change-log-font-lock-keywords
+  '(;;
+    ;; Date lines, new and old styles.
+    ("^\\sw.........[0-9:+ ]*"
+     (0 'change-log-date-face)
+     ;; Name and e-mail; some people put e-mail in parens, not angles.
+     ("\\([^<(]+?\\)[ \t]*[(<]\\([A-Za-z0-9_.-]+@[A-Za-z0-9_.-]+\\)[>)]" nil nil
+      (1 'change-log-name-face)
+      (2 'change-log-email-face)))
+    ;;
+    ;; File names.
+    ("^\t\\* \\([^ ,:([\n]+\\)"
+     (1 'change-log-file-face)
+     ;; Possibly further names in a list:
+     ("\\=, \\([^ ,:([\n]+\\)" nil nil (1 'change-log-file-face))
+     ;; Possibly a parenthesized list of names:
+     ("\\= (\\([^) ,:\n]+\\)" nil nil (1 'change-log-list-face))
+     ("\\=, *\\([^) ,:\n]+\\)" nil nil (1 'change-log-list-face)))
+    ;;
+    ;; Function or variable names.
+    ("^\t(\\([^) ,:\n]+\\)"
+     (1 'change-log-list-face)
+     ("\\=, *\\([^) ,:\n]+\\)" nil nil (1 'change-log-list-face)))
+    ;;
+    ;; Conditionals.
+    ("\\[!?\\([^]\n]+\\)\\]\\(:\\| (\\)" (1 'change-log-conditionals-face))
+    ;;
+    ;; Function of change.
+    ("<\\([^>\n]+\\)>\\(:\\| (\\)" (1 'change-log-function-face))
+    ;;
+    ;; Acknowledgements.
+    ("\\(^\t\\|  \\)\\(From\\|Patch\\(es\\)? by\\|Report\\(ed by\\| from\\)\\|Suggest\\(ed by\\|ion from\\)\\)"
+     2 'change-log-acknowledgement-face))
+  "Additional expressions to highlight in Change Log mode.")
+
+(defvar change-log-mode-map (make-sparse-keymap)
+  "Keymap for Change Log major mode.")
+
+(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 ()
+  "Return (system-dependent) default name for a change log file."
   (or change-log-default-name
-      (if (eq system-type 'vax-vms) 
-         "$CHANGE_LOG$.TXT" 
-       (if (eq system-type 'ms-dos)
-           "changelo"
-         "ChangeLog"))))
+      (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)))
-    (expand-file-name
-     (read-file-name (format "Log file (default %s): " default)
-                    nil default))))
+  (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))))
+
+(defun change-log-version-number-search ()
+  "Return version number of current buffer's file.
+This is the value returned by `vc-workfile-version' or, if that is
+nil, by matching `change-log-version-number-regexp-list'."
+  (let* ((size (buffer-size))
+        (end
+         ;; The version number can be anywhere in the file, but
+         ;; restrict search to the file beginning: 10% should be
+         ;; enough to prevent some mishits.
+         ;;
+         ;; Apply percentage only if buffer size is bigger than
+         ;; approx 100 lines.
+         (if (> size (* 100 80))
+             (/ size 10)
+           size))
+        version)
+    (or (and buffer-file-name (vc-workfile-version buffer-file-name))
+       (save-restriction
+         (widen)
+         (let ((regexps change-log-version-number-regexp-list))
+           (while regexps
+             (save-excursion
+               (goto-char (point-min))
+               (when (re-search-forward (pop regexps) end t)
+                 (setq version (match-string 1)
+                       regexps nil)))))))))
+
 
 ;;;###autoload
-(defun find-change-log (&optional file-name)
+(defun find-change-log (&optional file-name buffer-file)
   "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 non-nil.
-Otherwise, search in the current directory and its successive parents
-for a file named `ChangeLog' (or whatever we use on this operating system).
+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."
+current buffer to the complete file name.
+Optional arg BUFFER-FILE overrides `buffer-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 change-log-default-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
+       (setq file-name (or (and (or buffer-file buffer-file-name)
                                 (file-name-directory
-                                 (file-chase-links buffer-file-name)))
+                                 (file-chase-links
+                                  (or buffer-file buffer-file-name))))
                            default-directory))
        (if (file-directory-p file-name)
            (setq file-name (expand-file-name (change-log-name) file-name)))
@@ -100,7 +372,7 @@ current buffer to the complete file name."
                             (not (string= (file-name-directory file1)
                                           parent-dir))))
            ;; Move up to the parent dir and try again.
-           (setq file1 (expand-file-name 
+           (setq file1 (expand-file-name
                         (file-name-nondirectory (change-log-name))
                         parent-dir)))
          ;; If we found a change log in a parent, use that.
@@ -110,16 +382,44 @@ current buffer to the complete file name."
   (set (make-local-variable 'change-log-default-name) file-name)
   file-name)
 
+(defun add-log-file-name (buffer-file log-file)
+  ;; Never want to add a change log entry for the ChangeLog file itself.
+  (unless (or (null buffer-file) (string= buffer-file log-file))
+    (if add-log-file-name-function
+       (funcall add-log-file-name-function buffer-file)
+      (setq buffer-file
+           (if (string-match
+                (concat "^" (regexp-quote (file-name-directory log-file)))
+                buffer-file)
+               (substring buffer-file (match-end 0))
+             (file-name-nondirectory buffer-file)))
+      ;; If we have a backup file, it's presumably because we're
+      ;; comparing old and new versions (e.g. for deleted
+      ;; functions) and we'll want to use the original name.
+      (if (backup-file-name-p buffer-file)
+         (file-name-sans-versions buffer-file)
+       buffer-file))))
+
 ;;;###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'.
+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."
+never append to an existing entry.  Option `add-log-keep-changes-together'
+otherwise affects whether a new entry is created.
+
+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))
@@ -129,68 +429,64 @@ never append to an existing entry."
         ;; 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))))
-  (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))
-  (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)))
+
+  (let* ((defun (add-log-current-defun))
+        (version (and change-log-version-info-enabled
+                      (change-log-version-number-search)))
+        (buf-file-name (if add-log-buffer-file-name-function
+                           (funcall add-log-buffer-file-name-function)
+                         buffer-file-name))
+        (buffer-file (if buf-file-name (expand-file-name buf-file-name)))
+        (file-name (expand-file-name
+                    (or file-name (find-change-log file-name buffer-file))))
+        ;; Set ENTRY to the file name to use in the new entry.
+        (entry (add-log-file-name buffer-file file-name))
+        bound)
+
+    (if (or (and other-window (not (equal file-name buffer-file-name)))
+           (window-dedicated-p (selected-window)))
        (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))
-    (if (looking-at (concat (regexp-quote (substring (current-time-string)
-                                                    0 10))
-                           ".* " (regexp-quote add-log-full-name)
-                           "  <" (regexp-quote add-log-mailing-address)))
-       (forward-line 1)
-      (insert (current-time-string)
-             "  " add-log-full-name
-             "  <" add-log-mailing-address ">\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))
+    (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")))
+
+    (setq bound
+         (progn
+            (if (looking-at "\n*[^\n* \t]")
+                (skip-chars-forward "\n")
+             (if add-log-keep-changes-together
+                 (forward-page)        ; page delimits entries for date
+               (forward-paragraph)))   ; paragraph delimits entries for file
+           (point)))
     (goto-char (point-min))
-
     ;; Now insert the new line for this entry.
-    (cond ((re-search-forward "^\\s *\\*\\s *$" paragraph-end t)
+    (cond ((re-search-forward "^\\s *\\*\\s *$" bound t)
           ;; Put this file name into the existing empty entry.
           (if entry
               (insert entry)))
          ((and (not new-entry)
-               (re-search-forward
-                (concat (regexp-quote (concat "* " entry))
-                        ;; Don't accept `foo.bar' when
-                        ;; looking for `foo':
-                        "\\(\\s \\|[(),:]\\)")
-                paragraph-end t))
+               (let (case-fold-search)
+                 (re-search-forward
+                  (concat (regexp-quote (concat "* " entry))
+                          ;; Don't accept `foo.bar' when
+                          ;; looking for `foo':
+                          "\\(\\s \\|[(),:]\\)")
+                  bound t)))
           ;; Add to the existing entry for the same file.
           (re-search-forward "^\\s *$\\|^\\s \\*")
-          (beginning-of-line)
+          (goto-char (match-beginning 0))
+          ;; Delete excess empty lines; make just 2.
           (while (and (not (eobp)) (looking-at "^\\s *$"))
-            (delete-region (point) (save-excursion (forward-line 1) (point))))
-          (insert "\n\n")
+            (delete-region (point) (line-beginning-position 2)))
+          (insert-char ?\n 2)
           (forward-line -2)
           (indent-relative-maybe))
          (t
@@ -199,11 +495,12 @@ never append to an existing entry."
           (while (looking-at "\\sW")
             (forward-line 1))
           (while (and (not (eobp)) (looking-at "^\\s *$"))
-            (delete-region (point) (save-excursion (forward-line 1) (point))))
-          (insert "\n\n\n")
+            (delete-region (point) (line-beginning-position 2)))
+          (insert-char ?\n 3)
           (forward-line -2)
           (indent-to left-margin)
-          (insert "* " (or entry ""))))
+          (insert "* ")
+          (if entry (insert entry))))
     ;; Now insert the function name, if we have one.
     ;; Point is at the entry for this file,
     ;; either at the end of the line or at the first blank line.
@@ -211,24 +508,42 @@ never append to an existing entry."
        (progn
          ;; Make it easy to get rid of the function name.
          (undo-boundary)
-         (insert (if (save-excursion
-                       (beginning-of-line 1)
-                       (looking-at "\\s *$")) 
-                     ""
-                   " ")
-                 "(" defun "): "))
+         (unless (save-excursion
+                   (beginning-of-line 1)
+                   (looking-at "\\s *$"))
+           (insert ?\ ))
+         ;; See if the prev function name has a message yet or not
+         ;; If not, merge the two entries.
+         (let ((pos (point-marker)))
+           (if (and (skip-syntax-backward " ")
+                    (skip-chars-backward "):")
+                    (looking-at "):")
+                    (progn (delete-region (+ 1 (point)) (+ 2 (point))) t)
+                    (> fill-column (+ (current-column) (length defun) 3)))
+               (progn (delete-region (point) pos)
+                      (insert ", "))
+             (goto-char pos)
+             (insert "("))
+           (set-marker pos nil))
+         (insert defun "): ")
+         (if version
+             (insert version ?\ )))
       ;; No function name, so put in a colon unless we have just a star.
-      (if (not (save-excursion
-                (beginning-of-line 1)
-                (looking-at "\\s *\\(\\*\\s *\\)?$")))
-         (insert ": ")))))
+      (unless (save-excursion
+               (beginning-of-line 1)
+               (looking-at "\\s *\\(\\*\\s *\\)?$"))
+       (insert ": ")
+       (if version (insert version ?\ ))))))
 
 ;;;###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'."
+Optional arg WHOAMI (interactive prefix) non-nil means prompt for user
+name and site.
+Second optional arg FILE-NAME is file name of change log.
+If nil, use `change-log-default-name'.
+
+Affected by the same options as `add-change-log-entry'."
   (interactive (if current-prefix-arg
                   (list current-prefix-arg
                         (prompt-for-change-log-name))))
@@ -248,26 +563,27 @@ Runs `change-log-mode-hook'."
   (setq major-mode 'change-log-mode
        mode-name "Change Log"
        left-margin 8
-       fill-column 74)
+       fill-column 74
+       indent-tabs-mode t
+       tab-width 8)
   (use-local-map change-log-mode-map)
-  ;; Let each entry behave as one paragraph:
-  (set (make-local-variable 'paragraph-start) "^\\s *$\\|^\f")
-  (set (make-local-variable 'paragraph-separate) "^\\s *$\\|^\f\\|^\\sw")
-  ;; Let all entries for one day behave as one page.
+  (set (make-local-variable 'fill-paragraph-function)
+       'change-log-fill-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.  Adding `* ' allows eliding the blank line
+  ;; between entries for different files.
+  (set (make-local-variable 'paragraph-start) "\\s *$\\|\f\\|^\\<")
+  (set (make-local-variable 'paragraph-separate) paragraph-start)
   ;; 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 nil nil backward-paragraph))
   (run-hooks 'change-log-mode-hook))
 
-(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))
-
 ;; 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(".
@@ -276,66 +592,95 @@ Runs `change-log-mode-hook'."
   "Fill the paragraph, but preserve open parentheses at beginning of lines.
 Prefix arg means justify as well."
   (interactive "P")
-  (let ((paragraph-separate (concat paragraph-separate "\\|^\\s *\\s("))
-       (paragraph-start (concat paragraph-start "\\|^\\s *\\s(")))
-    (fill-paragraph justify)))
+  (let ((end (progn (forward-paragraph) (point)))
+       (beg (progn (backward-paragraph) (point)))
+       (paragraph-start (concat paragraph-start "\\|\\s *\\s(")))
+    (fill-region beg end justify)
+    t))
 \f
-(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.")
+(defcustom add-log-current-defun-header-regexp
+  "^\\([[:upper:]][[:upper:]_ ]*[[:upper:]_]\\|[-_[:alpha:]]+\\)[ \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 dsssl-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.
+Texinfo (@node titles) and Perl.
 
 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'.
+identifiers followed by `:' or `='.  See variables
+`add-log-current-defun-header-regexp' and
+`add-log-current-defun-function'
 
 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 a the beginning of a defun,
+         (cond (add-log-current-defun-function
+                (funcall add-log-current-defun-function))
+               ((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 (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))
-                     (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]")))
+                ;; Make sure we are really inside the defun found,
+                ;; not after it.
+                (when (and (looking-at "\\s(")
+                           (progn (end-of-defun)
+                                  (< location (point)))
+                           (progn (forward-sexp -1)
+                                  (>= location (point))))
+                  (if (looking-at "\\s(")
+                      (forward-char 1))
+                  ;; Skip the defining construct name, typically "defun"
+                  ;; or "defvar".
+                  (forward-sexp 1)
+                  ;; The second element is usually a symbol being defined.
+                  ;; If it is not, use the first symbol in it.
+                  (skip-chars-forward " \t\n'(")
+                  (buffer-substring-no-properties (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 '(c-mode c++-mode c++-c-mode))
+                (buffer-substring-no-properties (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.
@@ -344,119 +689,247 @@ Has a preference of looking backwards."
                 (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))))
-                          ;; Ordinary C function syntax.
-                          (setq beg (point))
-                          (if (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.
-                              (if (and (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))
-                                  (buffer-substring (point)
-                                                    (progn (backward-sexp 1)
-                                                           (point))))))))))
-               ((memq major-mode
-                      '(TeX-mode plain-TeX-mode LaTeX-mode;; tex-mode.el
-                                 plain-tex-mode latex-mode;; cmutex.el
-                                 ))
+                (when (progn (end-of-defun)
+                             (< location (point)))
+                  (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-no-properties
+                           (point)
+                           (progn (forward-sexp 1)
+                                  (point))))
+                      (if (looking-at "^[+-]")
+                          (change-log-get-method-definition)
+                        ;; Ordinary C function syntax.
+                        (setq beg (point))
+                        (if (and
+                             ;; Protect against "Unbalanced parens" error.
+                             (condition-case nil
+                                 (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 whitespace
+                              ;; in the name we use.
+                              (skip-chars-backward " \t\n")
+                              (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
+                                    "enum \\|struct \\|union \\|class ")
+                                   (setq middle (point)))
+                              (goto-char end)
+                              (when (eq (preceding-char) ?=)
+                                (forward-char -1)
+                                (skip-chars-backward " \t")
+                                (setq end (point)))
+                              (buffer-substring-no-properties
+                               middle end))))))))
+               ((memq major-mode add-log-tex-like-modes)
                 (if (re-search-backward
-                     "\\\\\\(sub\\)*\\(section\\|paragraph\\|chapter\\)" nil t)
+                     "\\\\\\(sub\\)*\\(section\\|paragraph\\|chapter\\)"
+                     nil t)
                     (progn
                       (goto-char (match-beginning 0))
-                      (buffer-substring (1+ (point));; without initial backslash
-                                        (progn
-                                          (end-of-line)
-                                          (point))))))
+                      (buffer-substring-no-properties
+                       (1+ (point))    ; without initial backslash
+                       (line-end-position)))))
                ((eq major-mode 'texinfo-mode)
-                (if (re-search-backward "^@node[ \t]+\\([^,]+\\)," nil t)
-                    (buffer-substring (match-beginning 1)
-                                      (match-end 1))))
-               ((eq major-mode 'perl-mode)
+                (if (re-search-backward "^@node[ \t]+\\([^,\n]+\\)" nil t)
+                    (match-string-no-properties 1)))
+               ((memq major-mode '(perl-mode cperl-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)))))))
+                    (match-string-no-properties 1)))
+               ;; Emacs's autoconf-mode installs its own
+               ;; `add-log-current-defun-function'.  This applies to
+               ;; a different mode apparently for editing .m4
+               ;; autoconf source.
+                ((eq major-mode 'autoconf-mode)
+                 (if (re-search-backward
+                     "^\\(\\(m4_\\)?define\\|A._DEFUN\\)(\\[?\\([A-Za-z0-9_]+\\)" nil t)
+                     (match-string-no-properties 3)))
                (t
                 ;; If all else fails, try heuristics
-                (let (case-fold-search)
+                (let (case-fold-search
+                      result)
                   (end-of-line)
-                  (if (re-search-backward add-log-current-defun-header-regexp
-                                          (- (point) 10000)
-                                          t)
-                      (buffer-substring (match-beginning 1)
-                                        (match-end 1))))))))
+                  (when (re-search-backward
+                         add-log-current-defun-header-regexp
+                         (- (point) 10000)
+                         t)
+                    (setq result (or (match-string-no-properties 1)
+                                     (match-string-no-properties 0)))
+                    ;; Strip whitespace away
+                    (when (string-match "\\([^ \t\n\r\f].*[^ \t\n\r\f]\\)"
+                                        result)
+                      (setq result (match-string-no-properties 1 result)))
+                    result))))))
     (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
+               (match-string 1)
+               end))
+  (goto-char (match-end 0)))
+
+(defun change-log-get-method-definition ()
+"For objective C, return the method name if we are in a method."
+  (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 "]"))))))
+\f
+(defun change-log-sortable-date-at ()
+  "Return date of log entry in a consistent form for sorting.
+Point is assumed to be at the start of the entry."
+  (require 'timezone)
+  (if (looking-at "^\\sw.........[0-9:+ ]*")
+      (let ((date (match-string-no-properties 0)))
+       (if date
+           (if (string-match "\\(....\\)-\\(..\\)-\\(..\\)\\s-+" date)
+               (concat (match-string 1 date) (match-string 2 date)
+                       (match-string 3 date))
+             (condition-case nil
+                 (timezone-make-date-sortable date)
+               (error nil)))))
+    (error "Bad date")))
+
+;;;###autoload
+(defun change-log-merge (other-log)
+  "Merge the contents of ChangeLog file OTHER-LOG with this buffer.
+Both must be found in Change Log mode (since the merging depends on
+the appropriate motion commands).
+
+Entries are inserted in chronological order.  Both the current and
+old-style time formats for entries are supported."
+  (interactive "*fLog file name to merge: ")
+  (if (not (eq major-mode 'change-log-mode))
+      (error "Not in Change Log mode"))
+  (let ((other-buf (find-file-noselect other-log))
+       (buf (current-buffer))
+       date1 start end)
+    (save-excursion
+      (goto-char (point-min))
+      (set-buffer other-buf)
+      (goto-char (point-min))
+      (if (not (eq major-mode 'change-log-mode))
+         (error "%s not found in Change Log mode" other-log))
+      ;; Loop through all the entries in OTHER-LOG.
+      (while (not (eobp))
+       (setq date1 (change-log-sortable-date-at))
+       (setq start (point)
+             end (progn (forward-page) (point)))
+       ;; Look for an entry in original buffer that isn't later.
+       (with-current-buffer buf
+         (while (and (not (eobp))
+                     (string< date1 (change-log-sortable-date-at)))
+           (forward-page))
+         (if (not (eobp))
+             (insert-buffer-substring other-buf start end)
+           ;; At the end of the original buffer, insert a newline to
+           ;; separate entries and then the rest of the file being
+           ;; merged.  Move to the end of it to terminate outer loop.
+           (insert "\n")
+           (insert-buffer-substring other-buf start
+                                    (with-current-buffer other-buf
+                                      (goto-char (point-max))
+                                      (point)))))))))
+
+;;;###autoload
+(defun change-log-redate ()
+  "Fix any old-style date entries in the current log file to default format."
+  (interactive)
+  (require 'timezone)
+  (save-excursion
+    (goto-char (point-min))
+    (while (re-search-forward "^\\sw.........[0-9:+ ]*" nil t)
+      (unless (= 12 (- (match-end 0) (match-beginning 0)))
+       (let* ((date (save-match-data
+                      (timezone-fix-time (match-string 0) nil nil)))
+              (zone (if (consp (aref date 6))
+                        (nth 1 (aref date 6)))))
+         (replace-match (format-time-string
+                         "%Y-%m-%d  "
+                         (encode-time (aref date 5)
+                                      (aref date 4)
+                                      (aref date 3)
+                                      (aref date 2)
+                                      (aref date 1)
+                                      (aref date 0)
+                                      zone))))))))
 
 (provide 'add-log)