lisp/vc/log-edit.el

   1 ;;; log-edit.el --- Major mode for editing CVS commit messages -*- lexical-binding: t -*-
   2
   3 ;; Copyright (C) 1999-2017 Free Software Foundation, Inc.
   4
   5 ;; Author: Stefan Monnier <monnier@iro.umontreal.ca>
   6 ;; Keywords: pcl-cvs cvs commit log vc
   7
   8 ;; This file is part of GNU Emacs.
   9
  10 ;; GNU Emacs is free software: you can redistribute it and/or modify
  11 ;; it under the terms of the GNU General Public License as published by
  12 ;; the Free Software Foundation, either version 3 of the License, or
  13 ;; (at your option) any later version.
  14
  15 ;; GNU Emacs is distributed in the hope that it will be useful,
  16 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  17 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18 ;; GNU General Public License for more details.
  19
  20 ;; You should have received a copy of the GNU General Public License
  21 ;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
  22
  23 ;;; Commentary:
  24
  25 ;; Todo:
  26
  27 ;; - Move in VC's code
  28 ;; - Add compatibility for VC's hook variables
  29
  30 ;;; Code:
  31
  32 (require 'add-log)                      ; for all the ChangeLog goodies
  33 (require 'pcvs-util)
  34 (require 'ring)
  35 (require 'message)
  36
  37 ;;;;
  38 ;;;; Global Variables
  39 ;;;;
  40
  41 (defgroup log-edit nil
  42   "Major mode for editing RCS and CVS commit messages."
  43   :group 'pcl-cvs
  44   :group 'vc                            ; It's used by VC.
  45   :version "21.1"
  46   :prefix "log-edit-")
  47
  48 ;; compiler pacifiers
  49 (defvar cvs-buffer)
  50
  51 \f
  52 ;; The main keymap
  53
  54 (easy-mmode-defmap log-edit-mode-map
  55   `(("\C-c\C-c" . log-edit-done)
  56     ("\C-c\C-a" . log-edit-insert-changelog)
  57     ("\C-c\C-d" . log-edit-show-diff)
  58     ("\C-c\C-f" . log-edit-show-files)
  59     ("\C-c\C-k" . log-edit-kill-buffer)
  60     ("\C-a"     . log-edit-beginning-of-line)
  61     ("\M-n"     . log-edit-next-comment)
  62     ("\M-p"     . log-edit-previous-comment)
  63     ("\M-r"     . log-edit-comment-search-backward)
  64     ("\M-s"     . log-edit-comment-search-forward)
  65     ("\C-c?"    . log-edit-mode-help))
  66   "Keymap for the `log-edit-mode' (to edit version control log messages)."
  67   :group 'log-edit)
  68
  69 ;; Compatibility with old names.  Should we bother ?
  70 (defvar vc-log-mode-map log-edit-mode-map)
  71 (defvar vc-log-entry-mode vc-log-mode-map)
  72
  73 (easy-menu-define log-edit-menu log-edit-mode-map
  74   "Menu used for `log-edit-mode'."
  75   '("Log-Edit"
  76     ["Done" log-edit-done
  77      :help "Exit log-edit and proceed with the actual action."]
  78     "--"
  79     ["Insert ChangeLog" log-edit-insert-changelog
  80      :help "Insert a log message by looking at the ChangeLog"]
  81     ["Add to ChangeLog" log-edit-add-to-changelog
  82      :help "Insert this log message into the appropriate ChangeLog file"]
  83     "--"
  84     ["Show diff" log-edit-show-diff
  85      :help "Show the diff for the files to be committed."]
  86     ["List files" log-edit-show-files
  87      :help "Show the list of relevant files."]
  88     "--"
  89     ["Previous comment"         log-edit-previous-comment
  90      :help "Cycle backwards through comment history"]
  91     ["Next comment"             log-edit-next-comment
  92      :help "Cycle forwards through comment history."]
  93     ["Search comment forward"   log-edit-comment-search-forward
  94      :help "Search forwards through comment history for a substring match of str"]
  95     ["Search comment backward"  log-edit-comment-search-backward
  96      :help "Search backwards through comment history for substring match of str"]))
  97
  98 (defcustom log-edit-confirm 'changed
  99   "If non-nil, `log-edit-done' will request confirmation.
 100 If `changed', only request confirmation if the list of files has
 101   changed since the beginning of the log-edit session."
 102   :group 'log-edit
 103   :type '(choice (const changed) (const t) (const nil)))
 104
 105 (defcustom log-edit-keep-buffer nil
 106   "If non-nil, don't hide the buffer after `log-edit-done'."
 107   :group 'log-edit
 108   :type 'boolean)
 109
 110 (defcustom log-edit-require-final-newline t
 111   "Enforce a newline at the end of commit log messages.
 112 Enforce it silently if t, query if non-nil and don't do anything if nil."
 113   :group 'log-edit
 114   :type '(choice (const ask) (const t) (const nil)))
 115
 116 (defcustom log-edit-setup-invert nil
 117   "Non-nil means `log-edit' should invert the meaning of its SETUP arg.
 118 If SETUP is `force', this variable has no effect."
 119   :group 'log-edit
 120   :type 'boolean)
 121
 122 (defcustom log-edit-setup-add-author nil
 123   "Non-nil means `log-edit' may add the `Author:' header.
 124 This applies when its SETUP argument is non-nil."
 125   :version "24.4"
 126   :group 'log-edit
 127   :type 'boolean
 128   :safe 'booleanp)
 129
 130 (defcustom log-edit-hook '(log-edit-insert-message-template
 131                            log-edit-insert-cvs-template
 132                            log-edit-insert-changelog
 133                            log-edit-show-files)
 134   "Hook run at the end of `log-edit'."
 135   ;; Added log-edit-insert-message-template, moved log-edit-show-files.
 136   :version "24.4"
 137   :group 'log-edit
 138   :type '(hook :options (log-edit-insert-message-template
 139                          log-edit-insert-cvs-rcstemplate
 140                          log-edit-insert-cvs-template
 141                          log-edit-insert-changelog
 142                          log-edit-insert-filenames
 143                          log-edit-insert-filenames-without-changelog
 144                          log-edit-show-files)))
 145
 146 (defcustom log-edit-mode-hook (if (boundp 'vc-log-mode-hook) vc-log-mode-hook)
 147   "Hook run when entering `log-edit-mode'."
 148   :group 'log-edit
 149   :type 'hook)
 150
 151 (defcustom log-edit-done-hook nil
 152   "Hook run before doing the actual commit.
 153 This hook can be used to cleanup the message, enforce various
 154 conventions, or to allow recording the message in some other database,
 155 such as a bug-tracking system.  The list of files about to be committed
 156 can be obtained from `log-edit-files'."
 157   :group 'log-edit
 158   :type '(hook :options (log-edit-set-common-indentation
 159                          log-edit-add-to-changelog)))
 160
 161 (defcustom log-edit-strip-single-file-name nil
 162   "If non-nil, remove file name from single-file log entries."
 163   :type 'boolean
 164   :safe 'booleanp
 165   :group 'log-edit
 166   :version "24.1")
 167
 168 (defvar log-edit-changelog-full-paragraphs t
 169   "If non-nil, include full ChangeLog paragraphs in the log.
 170 This may be set in the \"local variables\" section of a ChangeLog, to
 171 indicate the policy for that ChangeLog.
 172
 173 A ChangeLog paragraph is a bunch of log text containing no blank lines;
 174 a paragraph usually describes a set of changes with a single purpose,
 175 but perhaps spanning several functions in several files.  Changes in
 176 different paragraphs are unrelated.
 177
 178 You could argue that the log entry for a file should contain the
 179 full ChangeLog paragraph mentioning the change to the file, even though
 180 it may mention other files, because that gives you the full context you
 181 need to understand the change.  This is the behavior you get when this
 182 variable is set to t.
 183
 184 On the other hand, you could argue that the log entry for a change
 185 should contain only the text for the changes which occurred in that
 186 file, because the log is per-file.  This is the behavior you get
 187 when this variable is set to nil.")
 188
 189 ;;;; Internal global or buffer-local vars
 190
 191 (defconst log-edit-files-buf "*log-edit-files*")
 192 (defvar log-edit-initial-files nil)
 193 (defvar log-edit-callback nil)
 194 (defvar log-edit-diff-function nil)
 195 (defvar log-edit-listfun nil)
 196
 197 (defvar log-edit-parent-buffer nil)
 198
 199 (defvar log-edit-vc-backend nil
 200   "VC fileset corresponding to the current log.")
 201
 202 ;;; Originally taken from VC-Log mode
 203
 204 (defconst log-edit-maximum-comment-ring-size 32
 205   "Maximum number of saved comments in the comment ring.")
 206 (define-obsolete-variable-alias 'vc-comment-ring 'log-edit-comment-ring "22.1")
 207 (defvar log-edit-comment-ring (make-ring log-edit-maximum-comment-ring-size))
 208 (define-obsolete-variable-alias 'vc-comment-ring-index
 209   'log-edit-comment-ring-index "22.1")
 210 (defvar log-edit-comment-ring-index nil)
 211 (defvar log-edit-last-comment-match "")
 212
 213 (defun log-edit-new-comment-index (stride len)
 214   "Return the comment index STRIDE elements from the current one.
 215 LEN is the length of `log-edit-comment-ring'."
 216   (mod (cond
 217         (log-edit-comment-ring-index (+ log-edit-comment-ring-index stride))
 218         ;; Initialize the index on the first use of this command
 219         ;; so that the first M-p gets index 0, and the first M-n gets
 220         ;; index -1.
 221         ((> stride 0) (1- stride))
 222         (t stride))
 223        len))
 224
 225 (defun log-edit-previous-comment (arg)
 226   "Cycle backwards through comment history.
 227 With a numeric prefix ARG, go back ARG comments."
 228   (interactive "*p")
 229   (let ((len (ring-length log-edit-comment-ring)))
 230     (if (<= len 0)
 231         (progn (message "Empty comment ring") (ding))
 232       ;; Don't use `erase-buffer' because we don't want to `widen'.
 233       (delete-region (point-min) (point-max))
 234       (setq log-edit-comment-ring-index (log-edit-new-comment-index arg len))
 235       (message "Comment %d" (1+ log-edit-comment-ring-index))
 236       (insert (ring-ref log-edit-comment-ring log-edit-comment-ring-index)))))
 237
 238 (defun log-edit-next-comment (arg)
 239   "Cycle forwards through comment history.
 240 With a numeric prefix ARG, go forward ARG comments."
 241   (interactive "*p")
 242   (log-edit-previous-comment (- arg)))
 243
 244 (defun log-edit-comment-search-backward (str &optional stride)
 245   "Search backwards through comment history for substring match of STR.
 246 If the optional argument STRIDE is present, that is a step-width to use
 247 when going through the comment ring."
 248   ;; Why substring rather than regexp ?   -sm
 249   (interactive
 250    (list (read-string "Comment substring: " nil nil log-edit-last-comment-match)))
 251   (unless stride (setq stride 1))
 252   (if (string= str "")
 253       (setq str log-edit-last-comment-match)
 254     (setq log-edit-last-comment-match str))
 255   (let* ((str (regexp-quote str))
 256          (len (ring-length log-edit-comment-ring))
 257          (n (log-edit-new-comment-index stride len)))
 258     (while (progn (when (or (>= n len) (< n 0)) (error "Not found"))
 259                   (not (string-match str (ring-ref log-edit-comment-ring n))))
 260       (setq n (+ n stride)))
 261     (setq log-edit-comment-ring-index n)
 262     (log-edit-previous-comment 0)))
 263
 264 (defun log-edit-comment-search-forward (str)
 265   "Search forwards through comment history for a substring match of STR."
 266   (interactive
 267    (list (read-string "Comment substring: " nil nil log-edit-last-comment-match)))
 268   (log-edit-comment-search-backward str -1))
 269
 270 (defun log-edit-comment-to-change-log (&optional whoami file-name)
 271   "Enter last VC comment into the change log for the current file.
 272 WHOAMI (interactive prefix) non-nil means prompt for user name
 273 and site.  FILE-NAME is the name of the change log; if nil, use
 274 `change-log-default-name'.
 275
 276 This may be useful as a `vc-checkin-hook' to update change logs
 277 automatically."
 278   (interactive (if current-prefix-arg
 279                    (list current-prefix-arg
 280                          (prompt-for-change-log-name))))
 281   (let (;; Extract the comment first so we get any error before doing anything.
 282         (comment (ring-ref log-edit-comment-ring 0))
 283         ;; Don't let add-change-log-entry insert a defun name.
 284         (add-log-current-defun-function 'ignore)
 285         end)
 286     ;; Call add-log to do half the work.
 287     (add-change-log-entry whoami file-name t t)
 288     ;; Insert the VC comment, leaving point before it.
 289     (setq end (save-excursion (insert comment) (point-marker)))
 290     (if (looking-at "\\s *\\s(")
 291         ;; It starts with an open-paren, as in "(foo): Frobbed."
 292         ;; So remove the ": " add-log inserted.
 293         (delete-char -2))
 294     ;; Canonicalize the white space between the file name and comment.
 295     (just-one-space)
 296     ;; Indent rest of the text the same way add-log indented the first line.
 297     (let ((indentation (current-indentation)))
 298       (save-excursion
 299         (while (< (point) end)
 300           (forward-line 1)
 301           (indent-to indentation))
 302         (setq end (point))))
 303     ;; Fill the inserted text, preserving open-parens at bol.
 304     (let ((paragraph-start (concat paragraph-start "\\|\\s *\\s(")))
 305       (beginning-of-line)
 306       (fill-region (point) end))
 307     ;; Canonicalize the white space at the end of the entry so it is
 308     ;; separated from the next entry by a single blank line.
 309     (skip-syntax-forward " " end)
 310     (delete-char (- (skip-syntax-backward " ")))
 311     (or (eobp) (looking-at "\n\n")
 312         (insert "\n"))))
 313
 314 ;; Compatibility with old names.
 315 (define-obsolete-function-alias 'vc-previous-comment 'log-edit-previous-comment "22.1")
 316 (define-obsolete-function-alias 'vc-next-comment 'log-edit-next-comment "22.1")
 317 (define-obsolete-function-alias 'vc-comment-search-reverse 'log-edit-comment-search-backward "22.1")
 318 (define-obsolete-function-alias 'vc-comment-search-forward 'log-edit-comment-search-forward "22.1")
 319 (define-obsolete-function-alias 'vc-comment-to-change-log 'log-edit-comment-to-change-log "22.1")
 320
 321 ;;;
 322 ;;; Actual code
 323 ;;;
 324
 325 (defface log-edit-summary '((t :inherit font-lock-function-name-face))
 326   "Face for the summary in `log-edit-mode' buffers.")
 327
 328 (defface log-edit-header '((t :inherit font-lock-keyword-face))
 329   "Face for the headers in `log-edit-mode' buffers.")
 330
 331 (defface log-edit-unknown-header '((t :inherit font-lock-comment-face))
 332   "Face for unknown headers in `log-edit-mode' buffers.")
 333
 334 (defvar log-edit-headers-alist '(("Summary" . log-edit-summary)
 335                                  ("Fixes") ("Author"))
 336   "AList of known headers and the face to use to highlight them.")
 337
 338 (defconst log-edit-header-contents-regexp
 339   "[ \t]*\\(.*\\(\n[ \t].*\\)*\\)\n?"
 340   "Regular expression matching a header field.
 341 The first subexpression is the actual text of the field.")
 342
 343 (defun log-edit-match-to-eoh (_limit)
 344   ;; FIXME: copied from message-match-to-eoh.
 345   (let ((start (point)))
 346     (rfc822-goto-eoh)
 347     ;; Typical situation: some temporary change causes the header to be
 348     ;; incorrect, so EOH comes earlier than intended: the last lines of the
 349     ;; intended headers are now not considered part of the header any more,
 350     ;; so they don't have the multiline property set.  When the change is
 351     ;; completed and the header has its correct shape again, the lack of the
 352     ;; multiline property means we won't rehighlight the last lines of
 353     ;; the header.
 354     (if (< (point) start)
 355         nil                             ;No header within start..limit.
 356       ;; Here we disregard LIMIT so that we may extend the area again.
 357       (set-match-data (list start (point)))
 358       (point))))
 359
 360 (defun log-edit-goto-eoh ()             ;FIXME: Almost rfc822-goto-eoh!
 361   (goto-char (point-min))
 362   (when (re-search-forward
 363          "^\\([^[:alpha:]]\\|[[:alnum:]-]+[^[:alnum:]-:]\\)" nil 'move)
 364     (goto-char (match-beginning 0))))
 365
 366 (defun log-edit--match-first-line (limit)
 367   (let ((start (point)))
 368     (log-edit-goto-eoh)
 369     (skip-chars-forward "\n")
 370     (and (< start (line-end-position))
 371          (< (point) limit)
 372          (save-excursion
 373            (not (re-search-backward "^Summary:[ \t]*[^ \t\n]" nil t)))
 374          (looking-at ".+")
 375          (progn
 376            (goto-char (match-end 0))
 377            (put-text-property (point-min) (point)
 378                               'jit-lock-defer-multiline t)
 379            (point)))))
 380
 381 (defvar log-edit-font-lock-keywords
 382   ;; Copied/inspired by message-font-lock-keywords.
 383   `((log-edit-match-to-eoh
 384      (,(concat "^\\(\\([[:alpha:]-]+\\):\\)" log-edit-header-contents-regexp)
 385       (progn (goto-char (match-beginning 0)) (match-end 0)) nil
 386       (1 (if (assoc-string (match-string 2) log-edit-headers-alist t)
 387              'log-edit-header
 388            'log-edit-unknown-header)
 389          nil lax)
 390       ;; From `log-edit-header-contents-regexp':
 391       (3 (or (cdr (assoc-string (match-string 2) log-edit-headers-alist t))
 392              'log-edit-header)
 393          nil lax))
 394      ("^\n"
 395       (progn (goto-char (match-end 0)) (1+ (match-end 0))) nil
 396       (0 '(:height 0.1 :inverse-video t))))
 397     (log-edit--match-first-line (0 'log-edit-summary))))
 398
 399 (defvar log-edit-font-lock-gnu-style nil
 400   "If non-nil, highlight common failures to follow the GNU coding standards.")
 401 (put 'log-edit-font-lock-gnu-style 'safe-local-variable 'booleanp)
 402
 403 (defconst log-edit-font-lock-gnu-keywords
 404     ;; Use
 405     ;;   * foo.el (bla, bli)
 406     ;;   (blo, blu): Toto.
 407     ;; Rather than
 408     ;;   * foo.el (bla, bli,
 409     ;;   blo, blu): Toto.
 410   '(("^[ \t]*\\(?:\\* .*\\)?\\(([^\n)]*,\\s-*\\)$"
 411      (1 '(face font-lock-warning-face
 412           help-echo "Continue function lists with \")\\n(\".") t))
 413     ;; Don't leave a lone word on a single line.
 414     ;;("^\\s-*\\(\\S-*[^\n:)]\\)\\s-*$" (1 font-lock-warning-face t))
 415     ;; Don't cut a sentence right after the first word (better to move
 416     ;; the sentence on the next line, then).
 417     ;;("[.:]\\s-+\\(\\sw+\\)\\s-*$" (1 font-lock-warning-face t))
 418     ;; Change Log entries should use present tense.
 419     ("):[ \t\n]*[[:alpha:]]+\\(ed\\)\\>"
 420      (1 '(face font-lock-warning-face help-echo "Use present tense.") t))
 421     ;; Change log entries start with a capital letter.
 422     ("): [a-z]" (0 '(face font-lock-warning-face help-echo "Capitalize.") t))
 423     ("[^[:upper:]]\\(\\. [[:upper:]]\\)"
 424      (1 '(face font-lock-warning-face
 425           help-echo "Use two spaces to end a sentence") t))
 426     ("^("
 427      (0 (let ((beg (max (point-min) (- (match-beginning 0) 2))))
 428           (put-text-property beg (match-end 0) 'font-lock-multiline t)
 429           (if (eq (char-syntax (char-after beg)) ?w)
 430               '(face font-lock-warning-face
 431                 help-echo "Punctuate previous line.")))
 432         t))
 433     ))
 434
 435 (defun log-edit-font-lock-keywords ()
 436   (if log-edit-font-lock-gnu-style
 437       (append log-edit-font-lock-keywords
 438               log-edit-font-lock-gnu-keywords)
 439     log-edit-font-lock-keywords))
 440
 441 ;;;###autoload
 442 (defun log-edit (callback &optional setup params buffer mode &rest _ignore)
 443   "Setup a buffer to enter a log message.
 444 The buffer is put in mode MODE or `log-edit-mode' if MODE is nil.
 445 \\<log-edit-mode-map>
 446 If SETUP is non-nil, erase the buffer and run `log-edit-hook'.
 447 Set mark and point around the entire contents of the buffer, so
 448 that it is easy to kill the contents of the buffer with
 449 \\[kill-region].  Once the user is done editing the message,
 450 invoking the command \\[log-edit-done] (`log-edit-done') will
 451 call CALLBACK to do the actual commit.
 452
 453 PARAMS if non-nil is an alist of variables and buffer-local
 454 values to give them in the Log Edit buffer.  Possible keys and
 455 associated values:
 456  `log-edit-listfun' -- function taking no arguments that returns the list of
 457  files that are concerned by the current operation (using relative names);
 458  `log-edit-diff-function' -- function taking no arguments that
 459  displays a diff of the files concerned by the current operation.
 460  `vc-log-fileset' -- the VC fileset to be committed (if any).
 461
 462 If BUFFER is non-nil `log-edit' will jump to that buffer, use it
 463 to edit the log message and go back to the current buffer when
 464 done.  Otherwise, it uses the current buffer."
 465   (let ((parent (current-buffer)))
 466     (if buffer (pop-to-buffer buffer))
 467     (when (and log-edit-setup-invert (not (eq setup 'force)))
 468       (setq setup (not setup)))
 469     (if mode
 470         (funcall mode)
 471       (log-edit-mode))
 472     (set (make-local-variable 'log-edit-callback) callback)
 473     (if (listp params)
 474         (dolist (crt params)
 475           (set (make-local-variable (car crt)) (cdr crt)))
 476       ;; For backward compatibility with log-edit up to version 22.2
 477       ;; accept non-list PARAMS to mean `log-edit-list'.
 478       (set (make-local-variable 'log-edit-listfun) params))
 479
 480     (if buffer (set (make-local-variable 'log-edit-parent-buffer) parent))
 481     (set (make-local-variable 'log-edit-initial-files) (log-edit-files))
 482     (when setup
 483       (erase-buffer)
 484       (run-hooks 'log-edit-hook))
 485     (push-mark (point-max))
 486     (message "%s" (substitute-command-keys
 487               "Press \\[log-edit-done] when you are done editing."))))
 488
 489 (define-derived-mode log-edit-mode text-mode "Log-Edit"
 490   "Major mode for editing version-control log messages.
 491 When done editing the log entry, just type \\[log-edit-done] which
 492 will trigger the actual commit of the file(s).
 493 Several other handy support commands are provided of course and
 494 the package from which this is used might also provide additional
 495 commands (under C-x v for VC, for example).
 496
 497 \\{log-edit-mode-map}"
 498   (set (make-local-variable 'font-lock-defaults)
 499        '(log-edit-font-lock-keywords t))
 500   (setq-local jit-lock-contextually t)  ;For the "first line is summary".
 501   (make-local-variable 'log-edit-comment-ring-index)
 502   (add-hook 'kill-buffer-hook 'log-edit-remember-comment nil t)
 503   (hack-dir-local-variables-non-file-buffer))
 504
 505 (defun log-edit-hide-buf (&optional buf where)
 506   (when (setq buf (get-buffer (or buf log-edit-files-buf)))
 507     ;; FIXME: Should use something like `quit-windows-on' here, but
 508     ;; that function never deletes this buffer's window because it
 509     ;; was created using `cvs-pop-to-buffer-same-frame'.
 510     (save-selected-window
 511       (let ((win (get-buffer-window buf where)))
 512         (if win (ignore-errors (delete-window win))))
 513       (bury-buffer buf))))
 514
 515 (defun log-edit-remember-comment (&optional comment)
 516   (unless comment (setq comment (buffer-string)))
 517   (when (or (ring-empty-p log-edit-comment-ring)
 518             (not (equal comment (ring-ref log-edit-comment-ring 0))))
 519     (ring-insert log-edit-comment-ring comment)))
 520
 521 (defun log-edit-done ()
 522   "Finish editing the log message and commit the files.
 523 If you want to abort the commit, simply delete the buffer."
 524   (interactive)
 525   ;; Clean up empty headers.
 526   (goto-char (point-min))
 527   (while (looking-at (concat "^[a-z]*:" log-edit-header-contents-regexp))
 528     (let ((beg (match-beginning 0)))
 529       (goto-char (match-end 0))
 530       (if (string-match "\\`[ \n\t]*\\'" (match-string 1))
 531           (delete-region beg (point)))))
 532   ;; Get rid of leading empty lines.
 533   (goto-char (point-min))
 534   (when (looking-at "\\([ \t]*\n\\)+")
 535     (delete-region (match-beginning 0) (match-end 0)))
 536   ;; Get rid of trailing empty lines
 537   (goto-char (point-max))
 538   (skip-syntax-backward " ")
 539   (when (equal (char-after) ?\n) (forward-char 1))
 540   (delete-region (point) (point-max))
 541   ;; Check for final newline
 542   (if (and (> (point-max) (point-min))
 543            (/= (char-before (point-max)) ?\n)
 544            (or (eq log-edit-require-final-newline t)
 545                (and log-edit-require-final-newline
 546                     (y-or-n-p
 547                      (format "Buffer %s does not end in newline.  Add one? "
 548                              (buffer-name))))))
 549       (save-excursion
 550         (goto-char (point-max))
 551         (insert ?\n)))
 552   (log-edit-remember-comment)
 553   (let ((win (get-buffer-window log-edit-files-buf)))
 554     (if (and log-edit-confirm
 555              (not (and (eq log-edit-confirm 'changed)
 556                        (equal (log-edit-files) log-edit-initial-files)))
 557              (progn
 558                (log-edit-show-files)
 559                (not (y-or-n-p "Really commit? "))))
 560         (progn (when (not win) (log-edit-hide-buf))
 561                (message "Oh, well!  Later maybe?"))
 562       (run-hooks 'log-edit-done-hook)
 563       (log-edit-hide-buf)
 564       (unless (or log-edit-keep-buffer (not log-edit-parent-buffer))
 565         (cvs-bury-buffer (current-buffer) log-edit-parent-buffer))
 566       (call-interactively log-edit-callback))))
 567
 568 (defun log-edit-kill-buffer ()
 569   "Kill the current buffer.
 570 Also saves its contents in the comment history and hides
 571 `log-edit-files-buf'."
 572   (interactive)
 573   (log-edit-hide-buf)
 574   (let ((buf (current-buffer)))
 575     (quit-windows-on buf)
 576     (kill-buffer buf)))
 577
 578 (defun log-edit-files ()
 579   "Return the list of files that are about to be committed."
 580   (ignore-errors (funcall log-edit-listfun)))
 581
 582 (defun log-edit-mode-help ()
 583   "Provide help for the `log-edit-mode-map'."
 584   (interactive)
 585   (if (eq last-command 'log-edit-mode-help)
 586       (describe-function major-mode)
 587     (message "%s"
 588      (substitute-command-keys
 589       "Type `\\[log-edit-done]' to finish commit.  Try `\\[describe-function] log-edit-done' for more help."))))
 590
 591 (defcustom log-edit-common-indent 0
 592   "Minimum indentation to use in `log-edit-set-common-indentation'."
 593   :group 'log-edit
 594   :type 'integer)
 595
 596 (defun log-edit-set-common-indentation ()
 597   "(Un)Indent the current buffer rigidly to `log-edit-common-indent'."
 598   (save-excursion
 599     (let ((common (point-max)))
 600       (rfc822-goto-eoh)
 601       (while (< (point) (point-max))
 602         (if (not (looking-at "^[ \t]*$"))
 603             (setq common (min common (current-indentation))))
 604         (forward-line 1))
 605       (rfc822-goto-eoh)
 606       (indent-rigidly (point) (point-max)
 607                       (- log-edit-common-indent common)))))
 608
 609 (defun log-edit-show-diff ()
 610   "Show the diff for the files to be committed."
 611   (interactive)
 612   (if (functionp log-edit-diff-function)
 613       (funcall log-edit-diff-function)
 614     (error "Diff functionality has not been setup")))
 615
 616 (defun log-edit-show-files ()
 617   "Show the list of files to be committed."
 618   (interactive)
 619   (let* ((files (log-edit-files))
 620          (buf (get-buffer-create log-edit-files-buf)))
 621     (with-current-buffer buf
 622       (log-edit-hide-buf buf 'all)
 623       (setq buffer-read-only nil)
 624       (erase-buffer)
 625       (cvs-insert-strings files)
 626       (setq buffer-read-only t)
 627       (goto-char (point-min))
 628       (save-selected-window
 629         (cvs-pop-to-buffer-same-frame buf)
 630         (shrink-window-if-larger-than-buffer)
 631         (set-window-dedicated-p (selected-window) t)
 632         (selected-window)))))
 633
 634 (defun log-edit-beginning-of-line (&optional n)
 635   "Move point to beginning of header value or to beginning of line.
 636
 637 It works the same as `message-beginning-of-line', but it uses a
 638 different header separator appropriate for `log-edit-mode'."
 639   (interactive "p")
 640   (let ((mail-header-separator ""))
 641     (message-beginning-of-line n)))
 642
 643 (defun log-edit-empty-buffer-p ()
 644   "Return non-nil if the buffer is \"empty\"."
 645   (or (= (point-min) (point-max))
 646       (save-excursion
 647         (goto-char (point-min))
 648         (while (and (looking-at "^\\([a-zA-Z]+: ?\\)?$")
 649                     (zerop (forward-line 1))))
 650         (eobp))))
 651
 652 (defun log-edit-insert-message-template ()
 653   "Insert the default template with Summary and Author."
 654   (interactive)
 655   (when (or (called-interactively-p 'interactive)
 656             (log-edit-empty-buffer-p))
 657     (insert "Summary: ")
 658     (when log-edit-setup-add-author
 659       (insert "\nAuthor: "))
 660     (insert "\n\n")
 661     (message-position-point)))
 662
 663 (defun log-edit-insert-cvs-template ()
 664   "Insert the template specified by the CVS administrator, if any.
 665 This simply uses the local CVS/Template file."
 666   (interactive)
 667   (when (or (called-interactively-p 'interactive)
 668             (log-edit-empty-buffer-p))
 669     ;; Should the template take precedence over an empty Summary:,
 670     ;; ie should we first erase the buffer?
 671     (when (file-readable-p "CVS/Template")
 672       (goto-char (point-max))
 673       (insert-file-contents "CVS/Template"))))
 674
 675 (defun log-edit-insert-cvs-rcstemplate ()
 676   "Insert the rcstemplate from the CVS repository.
 677 This contacts the repository to get the rcstemplate file and
 678 can thus take some time."
 679   (interactive)
 680   (when (or (called-interactively-p 'interactive)
 681             (log-edit-empty-buffer-p))
 682     (when (file-readable-p "CVS/Root")
 683       (goto-char (point-max))
 684       ;; Ignore the stderr stuff, even if it's an error.
 685       (call-process "cvs" nil '(t nil) nil
 686                     "checkout" "-p" "CVSROOT/rcstemplate"))))
 687
 688 (defun log-edit-insert-filenames ()
 689   "Insert the list of files that are to be committed."
 690   (interactive)
 691   (insert "Affected files:  \n"
 692           (mapconcat 'identity (log-edit-files) "  \n")))
 693
 694 (defun log-edit-insert-filenames-without-changelog ()
 695   "Insert the list of files that have no ChangeLog message."
 696   (interactive)
 697   (let ((files
 698          (delq nil
 699                (mapcar
 700                 (lambda (file)
 701                   (unless (or (cdr-safe (log-edit-changelog-entries file))
 702                               (equal (file-name-nondirectory file) "ChangeLog"))
 703                     file))
 704                 (log-edit-files)))))
 705     (when files
 706       (goto-char (point-max))
 707       (insert (mapconcat 'identity files ", ") ": "))))
 708
 709 (defun log-edit-add-to-changelog ()
 710   "Insert this log message into the appropriate ChangeLog file."
 711   (interactive)
 712   (log-edit-remember-comment)
 713   (dolist (f (log-edit-files))
 714     (let ((buffer-file-name (expand-file-name f)))
 715       (save-excursion
 716         (log-edit-comment-to-change-log)))))
 717
 718 (defvar log-edit-changelog-use-first nil)
 719
 720 (defvar log-edit-rewrite-tiny-change t
 721   "Non-nil means rewrite (tiny change).")
 722
 723 (defvar log-edit-rewrite-fixes nil
 724   "Rule to rewrite bug numbers into Fixes: headers.
 725 The value should be of the form (REGEXP . REPLACEMENT)
 726 where REGEXP should match the expression referring to a bug number
 727 in the text, and REPLACEMENT is an expression to pass to `replace-match'
 728 to build the Fixes: header.")
 729 (put 'log-edit-rewrite-fixes 'safe-local-variable
 730      (lambda (v) (and (stringp (car-safe v)) (stringp (cdr v)))))
 731
 732 (defun log-edit-add-field (field value)
 733   (rfc822-goto-eoh)
 734   (if (save-excursion (re-search-backward (concat "^" field ":\\([ \t]*\\)$")
 735                                           nil t))
 736       (replace-match (concat " " value) t t nil 1)
 737     (insert field ": " value "\n" (if (looking-at "\n") "" "\n"))))
 738
 739 (defun log-edit-insert-changelog (&optional use-first)
 740   "Insert a log message by looking at the ChangeLog.
 741 The idea is to write your ChangeLog entries first, and then use this
 742 command to commit your changes.
 743
 744 To select default log text, we:
 745 - find the ChangeLog entries for the files to be checked in,
 746 - verify that the top entry in the ChangeLog is on the current date
 747   and by the current user; if not, we don't provide any default text,
 748 - search the ChangeLog entry for paragraphs containing the names of
 749   the files we're checking in, and finally
 750 - use those paragraphs as the log text.
 751
 752 If the optional prefix arg USE-FIRST is given (via \\[universal-argument]),
 753 or if the command is repeated a second time in a row, use the first log entry
 754 regardless of user name or time."
 755   (interactive "P")
 756   (save-excursion
 757     (let ((eoh (save-excursion (rfc822-goto-eoh) (point))))
 758       (when (<= (point) eoh)
 759         (goto-char eoh)
 760         (if (looking-at "\n") (forward-char 1))))
 761     (let ((author
 762            (let ((log-edit-changelog-use-first
 763                   (or use-first (eq last-command 'log-edit-insert-changelog))))
 764              (log-edit-insert-changelog-entries (log-edit-files)))))
 765       (log-edit-set-common-indentation)
 766       ;; Add an Author: field if appropriate.
 767       (when author (log-edit-add-field "Author" (car author)))
 768       ;; Add a Fixes: field if applicable.
 769       (when (consp log-edit-rewrite-fixes)
 770         (rfc822-goto-eoh)
 771         (when (re-search-forward (car log-edit-rewrite-fixes) nil t)
 772           (let ((start (match-beginning 0))
 773                 (end (match-end 0))
 774                 (fixes (match-substitute-replacement
 775                         (cdr log-edit-rewrite-fixes))))
 776             (delete-region start end)
 777             (log-edit-add-field "Fixes" fixes))))
 778       (and log-edit-strip-single-file-name
 779            (progn (rfc822-goto-eoh)
 780                   (if (looking-at "\n") (forward-char 1))
 781                   (looking-at "\\*\\s-+"))
 782            (let ((start (point)))
 783              (forward-line 1)
 784              (when (not (re-search-forward "^\\*\\s-+" nil t))
 785                (goto-char start)
 786                (skip-chars-forward "^():")
 787                (skip-chars-forward ": ")
 788                (delete-region start (point)))))
 789       ;; FIXME also add "Co-authored-by" when appropriate.
 790       ;; Bzr accepts multiple --author arguments, others (?) don't.
 791       (and log-edit-rewrite-tiny-change
 792            (eq 'tiny (cdr author))
 793            (goto-char (point-max))
 794            (insert "\nCopyright-paperwork-exempt: yes\n")))))
 795
 796 ;;;;
 797 ;;;; functions for getting commit message from ChangeLog a file...
 798 ;;;; Courtesy Jim Blandy
 799 ;;;;
 800
 801 (defun log-edit-narrow-changelog ()
 802   "Narrow to the top page of the current buffer, a ChangeLog file.
 803 Actually, the narrowed region doesn't include the date line.
 804 A \"page\" in a ChangeLog file is the area between two dates."
 805   (or (eq major-mode 'change-log-mode)
 806       (error "log-edit-narrow-changelog: current buffer isn't a ChangeLog"))
 807
 808   (goto-char (point-min))
 809
 810   ;; Skip date line and subsequent blank lines.
 811   (forward-line 1)
 812   (if (looking-at "[ \t\n]*\n")
 813       (goto-char (match-end 0)))
 814
 815   (let ((start (point)))
 816     (forward-page 1)
 817     (narrow-to-region start (point))
 818     (goto-char (point-min))))
 819
 820 (defun log-edit-changelog-paragraph ()
 821   "Return the bounds of the ChangeLog paragraph containing point.
 822 If we are between paragraphs, return the previous paragraph."
 823   (beginning-of-line)
 824   (if (looking-at "^[ \t]*$")
 825       (skip-chars-backward " \t\n" (point-min)))
 826   (list (progn
 827           (if (re-search-backward "^[ \t]*\n" nil 'or-to-limit)
 828               (goto-char (match-end 0)))
 829           (point))
 830         (if (re-search-forward "^[ \t\n]*$" nil t)
 831             (match-beginning 0)
 832           (point-max))))
 833
 834 (defun log-edit-changelog-subparagraph ()
 835   "Return the bounds of the ChangeLog subparagraph containing point.
 836 A subparagraph is a block of non-blank lines beginning with an asterisk.
 837 If we are between sub-paragraphs, return the previous subparagraph."
 838     (end-of-line)
 839     (if (search-backward "*" nil t)
 840         (list (progn (beginning-of-line) (point))
 841               (progn
 842                 (forward-line 1)
 843                 (if (re-search-forward "^[ \t]*[\n*]" nil t)
 844                     (match-beginning 0)
 845                   (point-max))))
 846     (list (point) (point))))
 847
 848 (defun log-edit-changelog-entry ()
 849   "Return the bounds of the ChangeLog entry containing point.
 850 The variable `log-edit-changelog-full-paragraphs' decides whether an
 851 \"entry\" is a paragraph or a subparagraph; see its documentation string
 852 for more details."
 853   (save-excursion
 854     (if log-edit-changelog-full-paragraphs
 855         (log-edit-changelog-paragraph)
 856       (log-edit-changelog-subparagraph))))
 857
 858 (defvar user-full-name)
 859 (defvar user-mail-address)
 860
 861 (defvar log-edit-author)                ;Dynamically scoped.
 862
 863 (defun log-edit-changelog-ours-p ()
 864   "See if ChangeLog entry at point is for the current user, today.
 865 Return non-nil if it is."
 866   ;; Code adapted from add-change-log-entry.
 867   (let ((name (or (and (boundp 'add-log-full-name) add-log-full-name)
 868                   (and (fboundp 'user-full-name) (user-full-name))
 869                   (and (boundp 'user-full-name) user-full-name)))
 870         (mail (or (and (boundp 'add-log-mailing-address) add-log-mailing-address)
 871                   ;;(and (fboundp 'user-mail-address) (user-mail-address))
 872                   (and (boundp 'user-mail-address) user-mail-address)))
 873         (time (or (and (boundp 'add-log-time-format)
 874                        (functionp add-log-time-format)
 875                        (funcall add-log-time-format
 876                                 nil add-log-time-zone-rule))
 877                   (format-time-string "%Y-%m-%d"))))
 878     (if (null log-edit-changelog-use-first)
 879         (looking-at (regexp-quote (format "%s  %s  <%s>" time name mail)))
 880       ;; Check the author, to potentially add it as a "Author: " header.
 881       ;; FIXME This accumulates multiple authors, but only when there
 882       ;; are multiple ChangeLog files.  It should also check for
 883       ;; multiple authors in each individual entry.
 884       (when (looking-at "[^ \t]")
 885         (when (and (boundp 'log-edit-author)
 886                    (not (looking-at (format ".+  .+  <%s>"
 887                                             (regexp-quote mail))))
 888                    (looking-at ".+  \\(.+  <.+>\\) *\\((tiny change)\\)?"))
 889           (let ((author (replace-regexp-in-string "  " " "
 890                                                   (match-string 1))))
 891             (unless (and log-edit-author
 892                          (string-match (regexp-quote author)
 893                                        (car log-edit-author)))
 894               (if (not log-edit-author)
 895                   (setq log-edit-author
 896                         (cons author (if (match-string 2) 'tiny)))
 897                 (setcar log-edit-author
 898                         (concat (car log-edit-author) ", " author))
 899                 (and (match-string 2) (not (cdr log-edit-author))
 900                      (setcdr log-edit-author 'tiny))))))
 901         t))))
 902
 903 (defun log-edit-changelog-entries (file)
 904   "Return the ChangeLog entries for FILE, and the ChangeLog they came from.
 905 The return value looks like this:
 906   (LOGBUFFER (ENTRYSTART ENTRYEND) ...)
 907 where LOGBUFFER is the name of the ChangeLog buffer, and each
 908 \(ENTRYSTART . ENTRYEND) pair is a buffer region."
 909   (let ((changelog-file-name
 910          (let ((default-directory
 911                  (file-name-directory (expand-file-name file)))
 912                (visiting-buffer (find-buffer-visiting file)))
 913            ;; If there is a buffer visiting FILE, and it has a local
 914            ;; value for `change-log-default-name', use that.
 915            (if (and visiting-buffer
 916                     (local-variable-p 'change-log-default-name
 917                                       visiting-buffer))
 918                (with-current-buffer visiting-buffer
 919                  change-log-default-name)
 920              ;; `find-change-log' uses `change-log-default-name' if set
 921              ;; and sets it before exiting, so we need to work around
 922              ;; that memoizing which is undesired here.
 923              (setq change-log-default-name nil)
 924              (find-change-log)))))
 925     (when (or (find-buffer-visiting changelog-file-name)
 926               (file-exists-p changelog-file-name))
 927       (with-current-buffer (find-file-noselect changelog-file-name)
 928         (unless (eq major-mode 'change-log-mode) (change-log-mode))
 929         (goto-char (point-min))
 930         (if (looking-at "\\s-*\n") (goto-char (match-end 0)))
 931         (if (not (log-edit-changelog-ours-p))
 932             (list (current-buffer))
 933           (save-restriction
 934             (log-edit-narrow-changelog)
 935             (goto-char (point-min))
 936
 937             (let ((pattern (log-edit-changelog--pattern file
 938                                                         changelog-file-name)))
 939               (let (texts
 940                     (pos (point)))
 941                 (while (and (not (eobp)) (re-search-forward pattern nil t))
 942                   (let ((entry (log-edit-changelog-entry)))
 943                     (if (< (elt entry 1) (max (1+ pos) (point)))
 944                         ;; This is not relevant, actually.
 945                         nil
 946                       (push entry texts))
 947                     ;; Make sure we make progress.
 948                     (setq pos (max (1+ pos) (elt entry 1)))
 949                     (goto-char pos)))
 950
 951                 (cons (current-buffer) texts)))))))))
 952
 953 (defun log-edit-changelog--pattern (file changelog-file-name)
 954   (if (eq (aref file (1- (length file))) ?/)
 955       ;; Match any files inside this directory.
 956       (concat "^\t\\* " (unless (string= file "./") file))
 957     ;; Search for the name of FILE relative to the ChangeLog.  If that
 958     ;; doesn't occur anywhere, they're not using full relative
 959     ;; filenames in the ChangeLog, so just look for FILE; we'll accept
 960     ;; some false positives.
 961     (let ((pattern (file-relative-name
 962                     file (file-name-directory changelog-file-name))))
 963       ;; FIXME: When can the above return an empty string?
 964       (if (or (string= pattern "")
 965               (not (save-excursion
 966                      (search-forward pattern nil t))))
 967           (setq pattern (file-name-nondirectory file)))
 968       (setq pattern (concat "\\(^\\|[^[:alnum:]]\\)"
 969                             (regexp-quote pattern)
 970                             "\\($\\|[^[:alnum:]]\\)")))))
 971
 972 (defun log-edit-changelog-insert-entries (buffer beg end &rest files)
 973   "Insert the text from BUFFER between BEG and END.
 974 Rename relative filenames in the ChangeLog entry as FILES."
 975   (let ((opoint (point))
 976         (log-name (buffer-file-name buffer))
 977         (case-fold-search nil)
 978         bound)
 979     (insert-buffer-substring buffer beg end)
 980     (setq bound (point-marker))
 981     (when log-name
 982       (dolist (f files)
 983         ;; FIXME: f can be a directory, a (possibly indirect) parent
 984         ;; of the ChangeLog file.
 985         (save-excursion
 986           (goto-char opoint)
 987           (when (re-search-forward
 988                  (concat "\\(^\\|[ \t]\\)\\("
 989                          (file-relative-name f (file-name-directory log-name))
 990                          "\\)[, :\n]")
 991                  bound t)
 992             (replace-match f t t nil 2)))))
 993     ;; Eliminate tabs at the beginning of the line.
 994     (save-excursion
 995       (goto-char opoint)
 996       (while (re-search-forward "^\\(\t+\\)" bound t)
 997         (replace-match "")))))
 998
 999 (defun log-edit-insert-changelog-entries (files)
1000   "Given a list of files FILES, insert the ChangeLog entries for them."
1001   (let ((log-entries nil)
1002         (log-edit-author nil))
1003     ;; Note that any ChangeLog entry can apply to more than one file.
1004     ;; Here we construct a log-entries list with elements of the form
1005     ;;   ((LOGBUFFER ENTRYSTART ENTRYEND) FILE1 FILE2...)
1006     (dolist (file files)
1007       (let* ((entries (log-edit-changelog-entries file))
1008              (buf (car entries))
1009              key entry)
1010         (dolist (region (cdr entries))
1011           (setq key (cons buf region))
1012           (if (setq entry (assoc key log-entries))
1013               (setcdr entry (append (cdr entry) (list file)))
1014             (push (list key file) log-entries)))))
1015     ;; Now map over log-entries, and extract the strings.
1016     (dolist (log-entry (nreverse log-entries))
1017       (apply 'log-edit-changelog-insert-entries
1018              (append (car log-entry) (cdr log-entry)))
1019       (insert "\n"))
1020     ;; No newline after the last entry.
1021     (when log-entries
1022       (delete-char -1))
1023     log-edit-author))
1024
1025 (defun log-edit-toggle-header (header value)
1026   "Toggle a boolean-type header in the current buffer.
1027 See `log-edit-set-header' for details."
1028   (log-edit-set-header header value t))
1029
1030 (defun log-edit-set-header (header value &optional toggle)
1031   "Set the value of HEADER to VALUE in the current buffer.
1032 If TOGGLE is non-nil, and the value of HEADER already is VALUE,
1033 clear it.  Make sure there is an empty line after the headers.
1034 Return t if toggled on (or TOGGLE is nil), otherwise nil."
1035   (let ((val t)
1036         (line (concat header ": " value "\n")))
1037     (save-excursion
1038       (save-restriction
1039         (rfc822-goto-eoh)
1040         (narrow-to-region (point-min) (point))
1041         (goto-char (point-min))
1042         (if (re-search-forward (concat "^" header ":"
1043                                        log-edit-header-contents-regexp)
1044                                nil t)
1045             (if (setq val (not (and toggle (string= (match-string 1) value))))
1046                 (replace-match line t t)
1047               (replace-match "" t t nil 1))
1048           (insert line)))
1049       (rfc822-goto-eoh)
1050       (delete-horizontal-space)
1051       (unless (looking-at "\n")
1052         (insert "\n")))
1053     val))
1054
1055 (defun log-edit-extract-headers (headers comment)
1056   "Extract headers from COMMENT to form command line arguments.
1057 HEADERS should be an alist with elements (HEADER . CMDARG)
1058 or (HEADER . FUNCTION) associating headers to command line
1059 options and the result is then a list of the form (MSG ARGUMENTS...)
1060 where MSG is the remaining text from COMMENT.
1061 FUNCTION should be a function of one argument that takes the
1062 header value and returns the list of strings to be appended to
1063 ARGUMENTS.  CMDARG will be added to ARGUMENTS followed by the
1064 header value.  If \"Summary\" is not in HEADERS, then the
1065 \"Summary\" header is extracted anyway and put back as the first
1066 line of MSG."
1067   (with-temp-buffer
1068     (insert comment)
1069     (rfc822-goto-eoh)
1070     (narrow-to-region (point-min) (point))
1071     (let ((case-fold-search t)
1072           (summary ())
1073           (res ()))
1074       (dolist (header (if (assoc "Summary" headers) headers
1075                         (cons '("Summary" . t) headers)))
1076         (goto-char (point-min))
1077         (while (re-search-forward (concat "^" (car header)
1078                                           ":" log-edit-header-contents-regexp)
1079                                   nil t)
1080           (let ((txt (match-string 1)))
1081             (replace-match "" t t)
1082             (if (eq t (cdr header))
1083                 (setq summary txt)
1084               (if (functionp (cdr header))
1085                   (setq res (nconc res (funcall (cdr header) txt)))
1086                 (push txt res)
1087                 (push (or (cdr header) (car header)) res))))))
1088       ;; Remove header separator if the header is empty.
1089       (widen)
1090       (goto-char (point-min))
1091       (when (looking-at "\\([ \t]*\n\\)+")
1092         (delete-region (match-beginning 0) (match-end 0)))
1093       (if summary (insert summary "\n\n"))
1094       (cons (buffer-string) res))))
1095
1096 (provide 'log-edit)
1097
1098 ;;; log-edit.el ends here