lisp/vc/vc-annotate.el

   1 ;;; vc-annotate.el --- VC Annotate Support
   2
   3 ;; Copyright (C) 1997-1998, 2000-2011 Free Software Foundation, Inc.
   4
   5 ;; Author:     Martin Lorentzson  <emwson@emw.ericsson.se>
   6 ;; Maintainer: FSF
   7 ;; Keywords: vc tools
   8 ;; Package: vc
   9
  10 ;; This file is part of GNU Emacs.
  11
  12 ;; GNU Emacs is free software: you can redistribute it and/or modify
  13 ;; it under the terms of the GNU General Public License as published by
  14 ;; the Free Software Foundation, either version 3 of the License, or
  15 ;; (at your option) any later version.
  16
  17 ;; GNU Emacs is distributed in the hope that it will be useful,
  18 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  19 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20 ;; GNU General Public License for more details.
  21
  22 ;; You should have received a copy of the GNU General Public License
  23 ;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
  24
  25 ;;; Commentary:
  26 ;;
  27
  28 (require 'vc-hooks)
  29 (require 'vc)
  30
  31 ;;; Code:
  32 (eval-when-compile
  33   (require 'cl))
  34
  35 (defcustom vc-annotate-display-mode 'fullscale
  36   "Which mode to color the output of \\[vc-annotate] with by default."
  37   :type '(choice (const :tag "By Color Map Range" nil)
  38                  (const :tag "Scale to Oldest" scale)
  39                  (const :tag "Scale Oldest->Newest" fullscale)
  40                  (number :tag "Specify Fractional Number of Days"
  41                          :value "20.5"))
  42   :group 'vc)
  43
  44 (defcustom vc-annotate-color-map
  45   (if (and (tty-display-color-p) (<= (display-color-cells) 8))
  46       ;; A custom sorted TTY colormap
  47       (let* ((colors
  48               (sort
  49                (delq nil
  50                      (mapcar (lambda (x)
  51                                (if (not (or
  52                                          (string-equal (car x) "white")
  53                                          (string-equal (car x) "black") ))
  54                                    (car x)))
  55                              (tty-color-alist)))
  56                (lambda (a b)
  57                  (cond
  58                   ((or (string-equal a "red") (string-equal b "blue")) t)
  59                   ((or (string-equal b "red") (string-equal a "blue")) nil)
  60                   ((string-equal a "yellow") t)
  61                   ((string-equal b "yellow") nil)
  62                   ((string-equal a "cyan") t)
  63                   ((string-equal b "cyan") nil)
  64                   ((string-equal a "green") t)
  65                   ((string-equal b "green") nil)
  66                   ((string-equal a "magenta") t)
  67                   ((string-equal b "magenta") nil)
  68                   (t (string< a b))))))
  69              (date 20.)
  70              (delta (/ (- 360. date) (1- (length colors)))))
  71         (mapcar (lambda (x)
  72                   (prog1
  73                       (cons date x)
  74                     (setq date (+ date delta)))) colors))
  75     ;; Normal colormap: hue stepped from 0-240deg, value=1., saturation=0.75
  76     '(( 20. . "#FF3F3F")
  77       ( 40. . "#FF6C3F")
  78       ( 60. . "#FF993F")
  79       ( 80. . "#FFC63F")
  80       (100. . "#FFF33F")
  81       (120. . "#DDFF3F")
  82       (140. . "#B0FF3F")
  83       (160. . "#83FF3F")
  84       (180. . "#56FF3F")
  85       (200. . "#3FFF56")
  86       (220. . "#3FFF83")
  87       (240. . "#3FFFB0")
  88       (260. . "#3FFFDD")
  89       (280. . "#3FF3FF")
  90       (300. . "#3FC6FF")
  91       (320. . "#3F99FF")
  92       (340. . "#3F6CFF")
  93       (360. . "#3F3FFF")))
  94   "Association list of age versus color, for \\[vc-annotate].
  95 Ages are given in units of fractional days.  Default is eighteen
  96 steps using a twenty day increment, from red to blue.  For TTY
  97 displays with 8 or fewer colors, the default is red to blue with
  98 all other colors between (excluding black and white)."
  99   :type 'alist
 100   :group 'vc)
 101
 102 (defcustom vc-annotate-very-old-color "#3F3FFF"
 103   "Color for lines older than the current color range in \\[vc-annotate]."
 104   :type 'string
 105   :group 'vc)
 106
 107 (defcustom vc-annotate-background "black"
 108   "Background color for \\[vc-annotate].
 109 Default color is used if nil."
 110   :type '(choice (const :tag "Default background" nil) (color))
 111   :group 'vc)
 112
 113 (defcustom vc-annotate-menu-elements '(2 0.5 0.1 0.01)
 114   "Menu elements for the mode-specific menu of VC-Annotate mode.
 115 List of factors, used to expand/compress the time scale.  See `vc-annotate'."
 116   :type '(repeat number)
 117   :group 'vc)
 118
 119 (defvar vc-annotate-mode-map
 120   (let ((m (make-sparse-keymap)))
 121     (define-key m "a" 'vc-annotate-revision-previous-to-line)
 122     (define-key m "d" 'vc-annotate-show-diff-revision-at-line)
 123     (define-key m "=" 'vc-annotate-show-diff-revision-at-line)
 124     (define-key m "D" 'vc-annotate-show-changeset-diff-revision-at-line)
 125     (define-key m "f" 'vc-annotate-find-revision-at-line)
 126     (define-key m "j" 'vc-annotate-revision-at-line)
 127     (define-key m "l" 'vc-annotate-show-log-revision-at-line)
 128     (define-key m "n" 'vc-annotate-next-revision)
 129     (define-key m "p" 'vc-annotate-prev-revision)
 130     (define-key m "w" 'vc-annotate-working-revision)
 131     (define-key m "v" 'vc-annotate-toggle-annotation-visibility)
 132     (define-key m "v" 'vc-annotate-toggle-annotation-visibility)
 133     (define-key m "\C-m" 'vc-annotate-goto-line)
 134     m)
 135   "Local keymap used for VC-Annotate mode.")
 136
 137 ;;; Annotate functionality
 138
 139 ;; Declare globally instead of additional parameter to
 140 ;; temp-buffer-show-function (not possible to pass more than one
 141 ;; parameter).  The use of annotate-ratio is deprecated in favor of
 142 ;; annotate-mode, which replaces it with the more sensible "span-to
 143 ;; days", along with autoscaling support.
 144 (defvar vc-annotate-ratio nil "Global variable.")
 145
 146 ;; internal buffer-local variables
 147 (defvar vc-annotate-backend nil)
 148 (defvar vc-annotate-parent-file nil)
 149 (defvar vc-annotate-parent-rev nil)
 150 (defvar vc-annotate-parent-display-mode nil)
 151
 152 (defconst vc-annotate-font-lock-keywords
 153   ;; The fontification is done by vc-annotate-lines instead of font-lock.
 154   '((vc-annotate-lines)))
 155
 156 (define-derived-mode vc-annotate-mode special-mode "Annotate"
 157   "Major mode for output buffers of the `vc-annotate' command.
 158
 159 You can use the mode-specific menu to alter the time-span of the used
 160 colors.  See variable `vc-annotate-menu-elements' for customizing the
 161 menu items."
 162   ;; Frob buffer-invisibility-spec so that if it is originally a naked t,
 163   ;; it will become a list, to avoid initial annotations being invisible.
 164   (add-to-invisibility-spec 'foo)
 165   (remove-from-invisibility-spec 'foo)
 166   (set (make-local-variable 'truncate-lines) t)
 167   (set (make-local-variable 'font-lock-defaults)
 168        '(vc-annotate-font-lock-keywords t))
 169   (hack-dir-local-variables-non-file-buffer))
 170
 171 (defun vc-annotate-toggle-annotation-visibility ()
 172   "Toggle whether or not the annotation is visible."
 173   (interactive)
 174   (funcall (if (memq 'vc-annotate-annotation buffer-invisibility-spec)
 175                'remove-from-invisibility-spec
 176              'add-to-invisibility-spec)
 177            'vc-annotate-annotation)
 178   (force-window-update (current-buffer)))
 179
 180 (defun vc-annotate-display-default (ratio)
 181   "Display the output of \\[vc-annotate] using the default color range.
 182 The color range is given by `vc-annotate-color-map', scaled by RATIO.
 183 The current time is used as the offset."
 184   (interactive (progn (kill-local-variable 'vc-annotate-color-map) '(1.0)))
 185   (message "Redisplaying annotation...")
 186   (vc-annotate-display ratio)
 187   (message "Redisplaying annotation...done"))
 188
 189 (defun vc-annotate-oldest-in-map (color-map)
 190   "Return the oldest time in the COLOR-MAP."
 191   ;; Since entries should be sorted, we can just use the last one.
 192   (caar (last color-map)))
 193
 194 (defun vc-annotate-get-time-set-line-props ()
 195   (let ((bol (point))
 196         (date (vc-call-backend vc-annotate-backend 'annotate-time))
 197         (inhibit-read-only t))
 198     (assert (>= (point) bol))
 199     (put-text-property bol (point) 'invisible 'vc-annotate-annotation)
 200     date))
 201
 202 (defun vc-annotate-display-autoscale (&optional full)
 203   "Highlight the output of \\[vc-annotate] using an autoscaled color map.
 204 Autoscaling means that the map is scaled from the current time to the
 205 oldest annotation in the buffer, or, with prefix argument FULL, to
 206 cover the range from the oldest annotation to the newest."
 207   (interactive "P")
 208   (let ((newest 0.0)
 209         (oldest 999999.)                ;Any CVS users at the founding of Rome?
 210         (current (vc-annotate-convert-time (current-time)))
 211         date)
 212     (message "Redisplaying annotation...")
 213     ;; Run through this file and find the oldest and newest dates annotated.
 214     (save-excursion
 215       (goto-char (point-min))
 216       (while (not (eobp))
 217         (when (setq date (vc-annotate-get-time-set-line-props))
 218           (when (> date newest)
 219             (setq newest date))
 220           (when (< date oldest)
 221             (setq oldest date)))
 222         (forward-line 1)))
 223     (vc-annotate-display
 224      (/ (- (if full newest current) oldest)
 225         (vc-annotate-oldest-in-map vc-annotate-color-map))
 226      (if full newest))
 227     (message "Redisplaying annotation...done \(%s\)"
 228              (if full
 229                  (format "Spanned from %.1f to %.1f days old"
 230                          (- current oldest)
 231                          (- current newest))
 232                (format "Spanned to %.1f days old" (- current oldest))))))
 233
 234 ;; Menu -- Using easymenu.el
 235 (easy-menu-define vc-annotate-mode-menu vc-annotate-mode-map
 236   "VC Annotate Display Menu"
 237   `("VC-Annotate"
 238     ["By Color Map Range" (unless (null vc-annotate-display-mode)
 239                  (setq vc-annotate-display-mode nil)
 240                  (vc-annotate-display-select))
 241      :style toggle :selected (null vc-annotate-display-mode)]
 242     ,@(let ((oldest-in-map (vc-annotate-oldest-in-map vc-annotate-color-map)))
 243         (mapcar (lambda (element)
 244                   (let ((days (* element oldest-in-map)))
 245                     `[,(format "Span %.1f days" days)
 246                       (vc-annotate-display-select nil ,days)
 247                       :style toggle :selected
 248                       (eql vc-annotate-display-mode ,days) ]))
 249                 vc-annotate-menu-elements))
 250     ["Span ..."
 251      (vc-annotate-display-select
 252       nil (float (string-to-number (read-string "Span how many days? "))))]
 253     "--"
 254     ["Span to Oldest"
 255      (unless (eq vc-annotate-display-mode 'scale)
 256        (vc-annotate-display-select nil 'scale))
 257      :help
 258      "Use an autoscaled color map from the oldest annotation to the current time"
 259      :style toggle :selected
 260      (eq vc-annotate-display-mode 'scale)]
 261     ["Span Oldest->Newest"
 262      (unless (eq vc-annotate-display-mode 'fullscale)
 263        (vc-annotate-display-select nil 'fullscale))
 264      :help
 265      "Use an autoscaled color map from the oldest to the newest annotation"
 266      :style toggle :selected
 267      (eq vc-annotate-display-mode 'fullscale)]
 268     "--"
 269     ["Toggle annotation visibility" vc-annotate-toggle-annotation-visibility
 270      :help
 271      "Toggle whether the annotation is visible or not"]
 272     ["Annotate previous revision" vc-annotate-prev-revision
 273      :help "Visit the annotation of the revision previous to this one"]
 274     ["Annotate next revision" vc-annotate-next-revision
 275      :help "Visit the annotation of the revision after this one"]
 276     ["Annotate revision at line" vc-annotate-revision-at-line
 277      :help
 278      "Visit the annotation of the revision identified in the current line"]
 279     ["Annotate revision previous to line" vc-annotate-revision-previous-to-line
 280      :help "Visit the annotation of the revision before the revision at line"]
 281     ["Annotate latest revision" vc-annotate-working-revision
 282      :help "Visit the annotation of the working revision of this file"]
 283     "--"
 284     ["Show log of revision at line" vc-annotate-show-log-revision-at-line
 285      :help "Visit the log of the revision at line"]
 286     ["Show diff of revision at line" vc-annotate-show-diff-revision-at-line
 287      :help "Visit the diff of the revision at line from its previous revision"]
 288     ["Show changeset diff of revision at line"
 289      vc-annotate-show-changeset-diff-revision-at-line
 290      :enable
 291      (eq 'repository (vc-call-backend ,vc-annotate-backend 'revision-granularity))
 292      :help "Visit the diff of the revision at line from its previous revision"]
 293     ["Visit revision at line" vc-annotate-find-revision-at-line
 294      :help "Visit the revision identified in the current line"]))
 295
 296 (defun vc-annotate-display-select (&optional buffer mode)
 297   "Highlight the output of \\[vc-annotate].
 298 By default, the current buffer is highlighted, unless overridden by
 299 BUFFER.  `vc-annotate-display-mode' specifies the highlighting mode to
 300 use; you may override this using the second optional arg MODE."
 301   (interactive)
 302   (when mode (setq vc-annotate-display-mode mode))
 303   (pop-to-buffer (or buffer (current-buffer)))
 304   (cond ((null vc-annotate-display-mode)
 305          ;; The ratio is global, thus relative to the global color-map.
 306          (kill-local-variable 'vc-annotate-color-map)
 307          (vc-annotate-display-default (or vc-annotate-ratio 1.0)))
 308         ;; One of the auto-scaling modes
 309         ((eq vc-annotate-display-mode 'scale)
 310          (vc-exec-after `(vc-annotate-display-autoscale)))
 311         ((eq vc-annotate-display-mode 'fullscale)
 312          (vc-exec-after `(vc-annotate-display-autoscale t)))
 313         ((numberp vc-annotate-display-mode) ; A fixed number of days lookback
 314          (vc-annotate-display-default
 315           (/ vc-annotate-display-mode
 316              (vc-annotate-oldest-in-map vc-annotate-color-map))))
 317         (t (error "No such display mode: %s"
 318                   vc-annotate-display-mode))))
 319
 320 ;;;###autoload
 321 (defun vc-annotate (file rev &optional display-mode buf move-point-to vc-bk)
 322   "Display the edit history of the current FILE using colors.
 323
 324 This command creates a buffer that shows, for each line of the current
 325 file, when it was last edited and by whom.  Additionally, colors are
 326 used to show the age of each line--blue means oldest, red means
 327 youngest, and intermediate colors indicate intermediate ages.  By
 328 default, the time scale stretches back one year into the past;
 329 everything that is older than that is shown in blue.
 330
 331 With a prefix argument, this command asks two questions in the
 332 minibuffer.  First, you may enter a revision number REV; then the buffer
 333 displays and annotates that revision instead of the working revision
 334 \(type RET in the minibuffer to leave that default unchanged).  Then,
 335 you are prompted for the time span in days which the color range
 336 should cover.  For example, a time span of 20 days means that changes
 337 over the past 20 days are shown in red to blue, according to their
 338 age, and everything that is older than that is shown in blue.
 339
 340 If MOVE-POINT-TO is given, move the point to that line.
 341
 342 If VC-BK is given used that VC backend.
 343
 344 Customization variables:
 345
 346 `vc-annotate-menu-elements' customizes the menu elements of the
 347 mode-specific menu.  `vc-annotate-color-map' and
 348 `vc-annotate-very-old-color' define the mapping of time to colors.
 349 `vc-annotate-background' specifies the background color."
 350   (interactive
 351    (save-current-buffer
 352      (vc-ensure-vc-buffer)
 353      (list buffer-file-name
 354            (let ((def (vc-working-revision buffer-file-name)))
 355              (if (null current-prefix-arg) def
 356                (vc-read-revision
 357                 (format "Annotate from revision (default %s): " def)
 358                 (list buffer-file-name) nil def)))
 359            (if (null current-prefix-arg)
 360                vc-annotate-display-mode
 361              (float (string-to-number
 362                      (read-string "Annotate span days (default 20): "
 363                                   nil nil "20")))))))
 364   (vc-ensure-vc-buffer)
 365   (setq vc-annotate-display-mode display-mode) ;Not sure why.  --Stef
 366   (let* ((temp-buffer-name (format "*Annotate %s (rev %s)*" (buffer-name) rev))
 367          (temp-buffer-show-function 'vc-annotate-display-select)
 368          ;; If BUF is specified, we presume the caller maintains current line,
 369          ;; so we don't need to do it here.  This implementation may give
 370          ;; strange results occasionally in the case of REV != WORKFILE-REV.
 371          (current-line (or move-point-to (unless buf
 372                                            (save-restriction
 373                                              (widen)
 374                                              (line-number-at-pos))))))
 375     (message "Annotating...")
 376     ;; If BUF is specified it tells in which buffer we should put the
 377     ;; annotations.  This is used when switching annotations to another
 378     ;; revision, so we should update the buffer's name.
 379     (when buf (with-current-buffer buf
 380                 (rename-buffer temp-buffer-name t)
 381                 ;; In case it had to be uniquified.
 382                 (setq temp-buffer-name (buffer-name))))
 383     (with-output-to-temp-buffer temp-buffer-name
 384       (let ((backend (or vc-bk (vc-backend file)))
 385             (coding-system-for-read buffer-file-coding-system))
 386         (vc-call-backend backend 'annotate-command file
 387                          (get-buffer temp-buffer-name) rev)
 388         ;; we must setup the mode first, and then set our local
 389         ;; variables before the show-function is called at the exit of
 390         ;; with-output-to-temp-buffer
 391         (with-current-buffer temp-buffer-name
 392           (unless (equal major-mode 'vc-annotate-mode)
 393             (vc-annotate-mode))
 394           (set (make-local-variable 'vc-annotate-backend) backend)
 395           (set (make-local-variable 'vc-annotate-parent-file) file)
 396           (set (make-local-variable 'vc-annotate-parent-rev) rev)
 397           (set (make-local-variable 'vc-annotate-parent-display-mode)
 398                display-mode))))
 399
 400     (with-current-buffer temp-buffer-name
 401       (vc-exec-after
 402        `(progn
 403           ;; Ideally, we'd rather not move point if the user has already
 404           ;; moved it elsewhere, but really point here is not the position
 405           ;; of the user's cursor :-(
 406           (when ,current-line           ;(and (bobp))
 407             (goto-line ,current-line)
 408             (setq vc-sentinel-movepoint (point)))
 409           (unless (active-minibuffer-window)
 410             (message "Annotating... done")))))))
 411
 412 (defun vc-annotate-prev-revision (prefix)
 413   "Visit the annotation of the revision previous to this one.
 414
 415 With a numeric prefix argument, annotate the revision that many
 416 revisions previous."
 417   (interactive "p")
 418   (vc-annotate-warp-revision (- 0 prefix)))
 419
 420 (defun vc-annotate-next-revision (prefix)
 421   "Visit the annotation of the revision after this one.
 422
 423 With a numeric prefix argument, annotate the revision that many
 424 revisions after."
 425   (interactive "p")
 426   (vc-annotate-warp-revision prefix))
 427
 428 (defun vc-annotate-working-revision ()
 429   "Visit the annotation of the working revision of this file."
 430   (interactive)
 431   (if (not (equal major-mode 'vc-annotate-mode))
 432       (message "Cannot be invoked outside of a vc annotate buffer")
 433     (let ((warp-rev (vc-working-revision vc-annotate-parent-file)))
 434       (if (equal warp-rev vc-annotate-parent-rev)
 435           (message "Already at revision %s" warp-rev)
 436         (vc-annotate-warp-revision warp-rev)))))
 437
 438 (defun vc-annotate-extract-revision-at-line ()
 439   "Extract the revision number of the current line.
 440 Return a cons (REV . FILENAME)."
 441   ;; This function must be invoked from a buffer in vc-annotate-mode
 442   (let ((rev (vc-call-backend vc-annotate-backend
 443                               'annotate-extract-revision-at-line)))
 444     (if (or (null rev) (consp rev))
 445         rev
 446       (cons rev vc-annotate-parent-file))))
 447
 448 (defun vc-annotate-revision-at-line ()
 449   "Visit the annotation of the revision identified in the current line."
 450   (interactive)
 451   (if (not (equal major-mode 'vc-annotate-mode))
 452       (message "Cannot be invoked outside of a vc annotate buffer")
 453     (let ((rev-at-line (vc-annotate-extract-revision-at-line)))
 454       (if (not rev-at-line)
 455           (message "Cannot extract revision number from the current line")
 456         (if (and (equal (car rev-at-line) vc-annotate-parent-rev)
 457                  (string= (cdr rev-at-line) vc-annotate-parent-file))
 458             (message "Already at revision %s" rev-at-line)
 459           (vc-annotate-warp-revision (car rev-at-line) (cdr rev-at-line)))))))
 460
 461 (defun vc-annotate-find-revision-at-line ()
 462   "Visit the revision identified in the current line."
 463   (interactive)
 464   (if (not (equal major-mode 'vc-annotate-mode))
 465       (message "Cannot be invoked outside of a vc annotate buffer")
 466     (let ((rev-at-line (vc-annotate-extract-revision-at-line)))
 467       (if (not rev-at-line)
 468           (message "Cannot extract revision number from the current line")
 469         (switch-to-buffer-other-window
 470          (vc-find-revision (cdr rev-at-line) (car rev-at-line) vc-annotate-backend))))))
 471
 472 (defun vc-annotate-revision-previous-to-line ()
 473   "Visit the annotation of the revision before the revision at line."
 474   (interactive)
 475   (if (not (equal major-mode 'vc-annotate-mode))
 476       (message "Cannot be invoked outside of a vc annotate buffer")
 477     (let* ((rev-at-line (vc-annotate-extract-revision-at-line))
 478            (prev-rev nil)
 479            (rev (car rev-at-line))
 480            (fname (cdr rev-at-line)))
 481       (if (not rev-at-line)
 482           (message "Cannot extract revision number from the current line")
 483         (setq prev-rev
 484               (vc-call-backend vc-annotate-backend 'previous-revision
 485                                fname rev))
 486         (vc-annotate-warp-revision prev-rev fname)))))
 487
 488 (defvar log-view-vc-backend)
 489 (defvar log-view-vc-fileset)
 490
 491 (defun vc-annotate-show-log-revision-at-line ()
 492   "Visit the log of the revision at line.
 493 If the VC backend supports it, only show the log entry for the revision.
 494 If a *vc-change-log* buffer exists and already shows a log for
 495 the file in question, search for the log entry required and move point."
 496   (interactive)
 497   (if (not (equal major-mode 'vc-annotate-mode))
 498       (message "Cannot be invoked outside of a vc annotate buffer")
 499     (let ((rev-at-line (vc-annotate-extract-revision-at-line)))
 500       (if (not rev-at-line)
 501           (message "Cannot extract revision number from the current line")
 502         (let ((backend vc-annotate-backend)
 503               (log-buf (get-buffer "*vc-change-log*"))
 504               pos)
 505           (if (and
 506                log-buf
 507                ;; Look for a log buffer that already displays the correct file.
 508                (with-current-buffer log-buf
 509                  (and (eq backend log-view-vc-backend)
 510                       (null (cdr log-view-vc-fileset))
 511                       (string= (car log-view-vc-fileset) (cdr rev-at-line))
 512                       ;; Check if the entry we require can be found.
 513                       (vc-call-backend
 514                        backend 'show-log-entry (car rev-at-line))
 515                       (setq pos (point)))))
 516               (progn
 517                 (pop-to-buffer log-buf)
 518                 (goto-char pos))
 519             ;; Ask the backend to display a single log entry.
 520             (vc-print-log-internal
 521              vc-annotate-backend (list (cdr rev-at-line))
 522              (car rev-at-line) t 1)))))))
 523
 524 (defun vc-annotate-show-diff-revision-at-line-internal (filediff)
 525   (if (not (equal major-mode 'vc-annotate-mode))
 526       (message "Cannot be invoked outside of a vc annotate buffer")
 527     (let* ((rev-at-line (vc-annotate-extract-revision-at-line))
 528           (prev-rev nil)
 529           (rev (car rev-at-line))
 530           (fname (cdr rev-at-line)))
 531       (if (not rev-at-line)
 532           (message "Cannot extract revision number from the current line")
 533         (setq prev-rev
 534               (vc-call-backend vc-annotate-backend 'previous-revision
 535                                (if filediff fname nil) rev))
 536         (if (not prev-rev)
 537             (message "Cannot diff from any revision prior to %s" rev)
 538           (save-window-excursion
 539             (vc-diff-internal
 540              nil
 541              ;; The value passed here should follow what
 542              ;; `vc-deduce-fileset' returns.
 543              (list vc-annotate-backend
 544                    (if filediff
 545                        (list fname)
 546                      nil))
 547              prev-rev rev))
 548           (switch-to-buffer "*vc-diff*"))))))
 549
 550 (defun vc-annotate-show-diff-revision-at-line ()
 551   "Visit the diff of the revision at line from its previous revision."
 552   (interactive)
 553   (vc-annotate-show-diff-revision-at-line-internal t))
 554
 555 (defun vc-annotate-show-changeset-diff-revision-at-line ()
 556   "Visit the diff of the revision at line from its previous revision for all files in the changeset."
 557   (interactive)
 558   (when (eq 'file (vc-call-backend vc-annotate-backend 'revision-granularity))
 559     (error "The %s backend does not support changeset diffs" vc-annotate-backend))
 560   (vc-annotate-show-diff-revision-at-line-internal nil))
 561
 562 (defun vc-annotate-warp-revision (revspec &optional file)
 563   "Annotate the revision described by REVSPEC.
 564
 565 If REVSPEC is a positive integer, warp that many revisions forward,
 566 if possible, otherwise echo a warning message.  If REVSPEC is a
 567 negative integer, warp that many revisions backward, if possible,
 568 otherwise echo a warning message.  If REVSPEC is a string, then it
 569 describes a revision number, so warp to that revision."
 570   (if (not (equal major-mode 'vc-annotate-mode))
 571       (message "Cannot be invoked outside of a vc annotate buffer")
 572     (let* ((buf (current-buffer))
 573            (oldline (line-number-at-pos))
 574            (revspeccopy revspec)
 575            (newrev nil))
 576       (cond
 577        ((and (integerp revspec) (> revspec 0))
 578         (setq newrev vc-annotate-parent-rev)
 579         (while (and (> revspec 0) newrev)
 580           (setq newrev (vc-call-backend vc-annotate-backend 'next-revision
 581                                         (or file vc-annotate-parent-file) newrev))
 582           (setq revspec (1- revspec)))
 583         (unless newrev
 584           (message "Cannot increment %d revisions from revision %s"
 585                    revspeccopy vc-annotate-parent-rev)))
 586        ((and (integerp revspec) (< revspec 0))
 587         (setq newrev vc-annotate-parent-rev)
 588         (while (and (< revspec 0) newrev)
 589           (setq newrev (vc-call-backend vc-annotate-backend 'previous-revision
 590                                         (or file vc-annotate-parent-file) newrev))
 591           (setq revspec (1+ revspec)))
 592         (unless newrev
 593           (message "Cannot decrement %d revisions from revision %s"
 594                    (- 0 revspeccopy) vc-annotate-parent-rev)))
 595        ((stringp revspec) (setq newrev revspec))
 596        (t (error "Invalid argument to vc-annotate-warp-revision")))
 597       (when newrev
 598         (vc-annotate (or file vc-annotate-parent-file) newrev
 599                      vc-annotate-parent-display-mode
 600                      buf
 601                      ;; Pass the current line so that vc-annotate will
 602                      ;; place the point in the line.
 603                      (min oldline (progn (goto-char (point-max))
 604                                          (forward-line -1)
 605                                          (line-number-at-pos)))
 606                      vc-annotate-backend)))))
 607
 608 (defun vc-annotate-compcar (threshold a-list)
 609   "Test successive cons cells of A-LIST against THRESHOLD.
 610 Return the first cons cell with a car that is not less than THRESHOLD,
 611 nil if no such cell exists."
 612  (let ((i 1)
 613        (tmp-cons (car a-list)))
 614    (while (and tmp-cons (< (car tmp-cons) threshold))
 615      (setq tmp-cons (car (nthcdr i a-list)))
 616      (setq i (+ i 1)))
 617    tmp-cons))                           ; Return the appropriate value
 618
 619 (defun vc-annotate-convert-time (time)
 620   "Convert a time value to a floating-point number of days.
 621 The argument TIME is a list as returned by `current-time' or
 622 `encode-time', only the first two elements of that list are considered."
 623   (/ (+ (* (float (car time)) (lsh 1 16)) (cadr time)) 24 3600))
 624
 625 (defun vc-annotate-difference (&optional offset)
 626   "Return the time span in days to the next annotation.
 627 This calls the backend function annotate-time, and returns the
 628 difference in days between the time returned and the current time,
 629 or OFFSET if present."
 630    (let ((next-time (vc-annotate-get-time-set-line-props)))
 631      (when next-time
 632        (- (or offset
 633               (vc-call-backend vc-annotate-backend 'annotate-current-time))
 634           next-time))))
 635
 636 (defun vc-default-annotate-current-time (backend)
 637   "Return the current time, encoded as fractional days."
 638   (vc-annotate-convert-time (current-time)))
 639
 640 (defvar vc-annotate-offset nil)
 641
 642 (defun vc-annotate-display (ratio &optional offset)
 643   "Highlight `vc-annotate' output in the current buffer.
 644 RATIO is the expansion that should be applied to `vc-annotate-color-map'.
 645 The annotations are relative to the current time, unless overridden by OFFSET."
 646   (when (/= ratio 1.0)
 647     (set (make-local-variable 'vc-annotate-color-map)
 648          (mapcar (lambda (elem) (cons (* (car elem) ratio) (cdr elem)))
 649                  vc-annotate-color-map)))
 650   (set (make-local-variable 'vc-annotate-offset) offset)
 651   (font-lock-mode 1))
 652
 653 (defun vc-annotate-lines (limit)
 654   (while (< (point) limit)
 655     (let ((difference (vc-annotate-difference vc-annotate-offset))
 656           (start (point))
 657           (end (progn (forward-line 1) (point))))
 658       (when difference
 659         (let* ((color (or (vc-annotate-compcar difference vc-annotate-color-map)
 660                           (cons nil vc-annotate-very-old-color)))
 661                ;; substring from index 1 to remove any leading `#' in the name
 662                (face-name (concat "vc-annotate-face-"
 663                                   (if (string-equal
 664                                        (substring (cdr color) 0 1) "#")
 665                                       (substring (cdr color) 1)
 666                                     (cdr color))))
 667                ;; Make the face if not done.
 668                (face (or (intern-soft face-name)
 669                          (let ((tmp-face (make-face (intern face-name))))
 670                            (set-face-foreground tmp-face (cdr color))
 671                            (when vc-annotate-background
 672                              (set-face-background tmp-face
 673                                                   vc-annotate-background))
 674                            tmp-face)))) ; Return the face
 675           (put-text-property start end 'face face)))))
 676   ;; Pretend to font-lock there were no matches.
 677   nil)
 678
 679 (defun vc-annotate-goto-line ()
 680   "Go to the line corresponding to the current VC Annotate line."
 681   (interactive)
 682   (unless (eq major-mode 'vc-annotate-mode)
 683     (error "Not in a VC-Annotate buffer"))
 684   (let ((line (save-restriction
 685                 (widen)
 686                 (line-number-at-pos)))
 687         (rev vc-annotate-parent-rev))
 688     (pop-to-buffer
 689      (or (and (buffer-live-p vc-parent-buffer)
 690               vc-parent-buffer)
 691          (and (file-exists-p vc-annotate-parent-file)
 692               (find-file-noselect vc-annotate-parent-file))
 693          (error "File not found: %s" vc-annotate-parent-file)))
 694     (save-restriction
 695       (widen)
 696       (goto-char (point-min))
 697       (forward-line (1- line))
 698       (recenter))
 699     ;; Issue a warning if the lines might be incorrect.
 700     (cond
 701      ((buffer-modified-p)
 702       (message "Buffer modified; annotated line numbers may be incorrect"))
 703      ((not (eq (vc-state buffer-file-name) 'up-to-date))
 704       (message "File is not up-to-date; annotated line numbers may be incorrect"))
 705      ((not (equal rev (vc-working-revision buffer-file-name)))
 706       (message "Annotations were for revision %s; line numbers may be incorrect"
 707                rev)))))
 708
 709 (provide 'vc-annotate)
 710
 711 ;;; vc-annotate.el ends here