lisp/ediff-vers.el

   1 ;;; ediff-vers.el --- version control interface to Ediff
   2
   3 ;;; Copyright (C) 1995, 1996 Free Software Foundation, Inc.
   4
   5 ;; Author: Michael Kifer <kifer@cs.sunysb.edu>
   6
   7 ;; This file is part of GNU Emacs.
   8
   9 ;; GNU Emacs is free software; you can redistribute it and/or modify
  10 ;; it under the terms of the GNU General Public License as published by
  11 ;; the Free Software Foundation; either version 2, or (at your option)
  12 ;; any later version.
  13
  14 ;; GNU Emacs is distributed in the hope that it will be useful,
  15 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  16 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17 ;; GNU General Public License for more details.
  18
  19 ;; You should have received a copy of the GNU General Public License
  20 ;; along with GNU Emacs; see the file COPYING.  If not, write to the
  21 ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  22 ;; Boston, MA 02111-1307, USA.
  23
  24
  25 ;;; Code:
  26
  27 ;; Compiler pacifier
  28 (defvar rcs-default-co-switches)
  29 (defvar sc-mode)
  30 (defvar cvs-shell)
  31 (defvar cvs-program)
  32 (defvar cvs-cookie-handle)
  33
  34 (eval-when-compile
  35   (load "pcl-cvs" 'noerror)
  36   (load "rcs" 'noerror)
  37   (load "generic-sc" 'noerror)
  38   (load "vc" 'noerror))
  39 ;; end pacifier
  40
  41 ;; VC.el support
  42 (defun vc-ediff-internal (rev1 rev2 &optional startup-hooks)
  43 ;; Run Ediff on versions of the current buffer.
  44 ;; If REV2 is "" then compare current buffer with REV1.
  45 ;; If the current buffer is named `F', the version is named `F.~REV~'.
  46 ;; If `F.~REV~' already exists, it is used instead of being re-created.
  47   (let (file1 file2 rev1buf rev2buf)
  48     (save-excursion
  49       (vc-version-other-window rev1)
  50       (setq rev1buf (current-buffer)
  51             file1 (buffer-file-name)))
  52     (save-excursion
  53       (or (string= rev2 "")             ; use current buffer
  54           (vc-version-other-window rev2))
  55       (setq rev2buf (current-buffer)
  56             file2 (buffer-file-name)))
  57     (setq startup-hooks
  58           (cons (` (lambda ()
  59                      (delete-file (, file1))
  60                      (or (, (string= rev2 "")) (delete-file (, file2)))
  61                      ))
  62                 startup-hooks))
  63     (ediff-buffers
  64      rev1buf rev2buf
  65      startup-hooks
  66      'ediff-revision)))
  67
  68 ;; RCS.el support
  69 (defun rcs-ediff-view-revision (&optional rev)
  70 ;; View previous RCS revision of current file.
  71 ;; With prefix argument, prompts for a revision name.
  72   (interactive (list (if current-prefix-arg
  73                          (read-string "Revision: "))))
  74   (let* ((filename (buffer-file-name (current-buffer)))
  75          (switches (append '("-p")
  76                            (if rev (list (concat "-r" rev)) nil)))
  77          (buff (concat (file-name-nondirectory filename) ".~" rev "~")))
  78     (message "Working ...")
  79     (setq filename (expand-file-name filename))
  80     (with-output-to-temp-buffer buff
  81       (let ((output-buffer (ediff-rcs-get-output-buffer filename buff)))
  82         (delete-windows-on output-buffer)
  83         (save-excursion
  84           (set-buffer output-buffer)
  85           (apply 'call-process "co" nil t nil
  86                  ;; -q: quiet (no diagnostics)
  87                  (append switches rcs-default-co-switches
  88                          (list "-q" filename)))))
  89       (message "")
  90       buff)))
  91
  92 (defun ediff-rcs-get-output-buffer (file name)
  93   ;; Get a buffer for RCS output for FILE, make it writable and clean it up.
  94   ;; Optional NAME is name to use instead of `*RCS-output*'.
  95   ;; This is a modified version from rcs.el v1.1. I use it here to make
  96   ;; Ediff immune to changes in rcs.el
  97   (let* ((default-major-mode 'fundamental-mode) ; no frills!
  98          (buf (get-buffer-create name)))
  99     (save-excursion
 100       (set-buffer buf)
 101       (setq buffer-read-only nil
 102             default-directory (file-name-directory (expand-file-name file)))
 103       (erase-buffer))
 104     buf))
 105
 106 (defun rcs-ediff-internal (rev1 rev2 &optional startup-hooks)
 107 ;; Run Ediff on versions of the current buffer.
 108 ;; If REV2 is "" then use current buffer.
 109   (let ((rev2buf (if (string= rev2 "")
 110                      (current-buffer)
 111                    (rcs-ediff-view-revision rev2)))
 112         (rev1buf (rcs-ediff-view-revision rev1)))
 113
 114     ;; rcs.el doesn't create temp version files, so we don't have to delete
 115     ;; anything in startup hooks to ediff-buffers
 116     (ediff-buffers rev1buf rev2buf startup-hooks 'ediff-revision)
 117     ))
 118
 119
 120 ;; GENERIC-SC.el support
 121
 122 (defun generic-sc-get-latest-rev ()
 123   (cond ((eq sc-mode 'CCASE)
 124          (eval "main/LATEST"))
 125         (t (eval ""))))
 126
 127 (defun generic-sc-ediff-internal (rev1 rev2 &optional startup-hooks)
 128 ;; Run Ediff on versions of the current buffer.
 129 ;; If REV2 is "" then compare current buffer with REV1.
 130 ;; If the current buffer is named `F', the version is named `F.~REV~'.
 131 ;; If `F.~REV~' already exists, it is used instead of being re-created.
 132   (let (rev1buf rev2buf)
 133     (save-excursion
 134       (if (or (not rev1) (string= rev1 ""))
 135           (setq rev1 (generic-sc-get-latest-rev)))
 136       (sc-visit-previous-revision rev1)
 137       (setq rev1buf (current-buffer)))
 138     (save-excursion
 139       (or (string= rev2 "")             ; use current buffer
 140           (sc-visit-previous-revision rev2))
 141       (setq rev2buf (current-buffer)))
 142     (ediff-buffers rev1buf rev2buf startup-hooks 'ediff-revision)))
 143
 144
 145 ;;; Merge with Version Control
 146
 147 (defun vc-ediff-merge-internal (rev1 rev2 ancestor-rev &optional startup-hooks)
 148 ;; If ANCESTOR-REV non-nil, merge with ancestor
 149   (let (buf1 buf2 ancestor-buf)
 150     (save-excursion
 151       (vc-version-other-window rev1)
 152       (setq buf1 (current-buffer)))
 153     (save-excursion
 154       (or (string= rev2 "")
 155           (vc-version-other-window rev2))
 156       (setq buf2 (current-buffer)))
 157     (if ancestor-rev
 158         (save-excursion
 159           (or (string= ancestor-rev "")
 160               (vc-version-other-window ancestor-rev))
 161           (setq ancestor-buf (current-buffer))))
 162     (setq startup-hooks
 163           (cons
 164            (` (lambda ()
 165                 (delete-file (, (buffer-file-name buf1)))
 166                 (or (, (string= rev2 ""))
 167                     (delete-file (, (buffer-file-name buf2))))
 168                 (or (, (string= ancestor-rev ""))
 169                     (, (not ancestor-rev))
 170                     (delete-file (, (buffer-file-name ancestor-buf))))
 171                 ))
 172            startup-hooks))
 173     (if ancestor-rev
 174         (ediff-merge-buffers-with-ancestor
 175          buf1 buf2 ancestor-buf
 176          startup-hooks 'ediff-merge-revisions-with-ancestor)
 177       (ediff-merge-buffers buf1 buf2 startup-hooks 'ediff-merge-revisions))
 178     ))
 179
 180 (defun rcs-ediff-merge-internal (rev1 rev2 ancestor-rev
 181                                       &optional startup-hooks)
 182   ;; If ANCESTOR-REV non-nil, merge with ancestor
 183   (let (buf1 buf2 ancestor-buf)
 184     (setq buf1 (rcs-ediff-view-revision rev1)
 185           buf2 (if (string= rev2 "")
 186                    (current-buffer)
 187                  (rcs-ediff-view-revision rev2))
 188           ancestor-buf (if ancestor-rev
 189                            (if (string= ancestor-rev "")
 190                                (current-buffer)
 191                              (rcs-ediff-view-revision ancestor-rev))))
 192     ;; rcs.el doesn't create temp version files, so we don't have to delete
 193     ;; anything in startup hooks to ediff-buffers
 194     (if ancestor-rev
 195         (ediff-merge-buffers-with-ancestor
 196          buf1 buf2 ancestor-buf
 197          startup-hooks 'ediff-merge-revisions-with-ancestor)
 198       (ediff-merge-buffers buf1 buf2 startup-hooks 'ediff-merge-revisions))))
 199
 200 (defun generic-sc-ediff-merge-internal (rev1 rev2 ancestor-rev
 201                                              &optional startup-hooks)
 202   ;; If ANCESTOR-REV non-nil, merge with ancestor
 203   (let (buf1 buf2 ancestor-buf)
 204     (save-excursion
 205       (if (string= rev1 "")
 206           (setq rev1 (generic-sc-get-latest-rev)))
 207       (sc-visit-previous-revision rev1)
 208       (setq buf1 (current-buffer)))
 209     (save-excursion
 210       (or (string= rev2 "")
 211           (sc-visit-previous-revision rev2))
 212       (setq buf2 (current-buffer)))
 213     (if ancestor-rev
 214         (save-excursion
 215           (or (string= ancestor-rev "")
 216               (sc-visit-previous-revision ancestor-rev))
 217           (setq ancestor-buf (current-buffer))))
 218     (if ancestor-rev
 219         (ediff-merge-buffers-with-ancestor
 220          buf1 buf2 ancestor-buf
 221          startup-hooks 'ediff-merge-revisions-with-ancestor)
 222       (ediff-merge-buffers buf1 buf2 startup-hooks 'ediff-merge-revisions))))
 223
 224
 225 ;; PCL-CVS.el support
 226
 227 (defun pcl-cvs-ediff-internal (rev1 rev2 &optional startup-hooks)
 228 ;; Run Ediff on a pair of revisions of the current buffer.
 229 ;; If REV1 is "", use the latest revision.
 230 ;; If REV2 is "", use the current buffer as the second file to compare.
 231   (let ((orig-buf (current-buffer))
 232         orig-file-name buf1 buf2 file1 file2)
 233
 234     (or (setq orig-file-name (buffer-file-name (current-buffer)))
 235         (error "Current buffer is not visiting any file"))
 236     (if (string= rev1 "") (setq rev1 nil)) ; latest revision
 237     (setq buf1 (ediff-pcl-cvs-view-revision orig-file-name rev1)
 238           buf2 (if (string= rev2 "")
 239                    orig-buf
 240                  (ediff-pcl-cvs-view-revision orig-file-name rev2))
 241           file1 (buffer-file-name buf1)
 242           file2 (buffer-file-name buf2))
 243     (setq startup-hooks
 244           (cons (` (lambda ()
 245                      (delete-file (, file1))
 246                      (or (, (string= rev2 "")) (delete-file (, file2)))
 247                      ))
 248                 startup-hooks))
 249     (ediff-buffers buf1 buf2 startup-hooks 'ediff-revision)))
 250
 251 ;; This function is the standard Ediff's interface to pcl-cvs.
 252 ;; Works like with other interfaces: runs ediff on versions of the file in the
 253 ;; current buffer.
 254 (defun pcl-cvs-ediff-merge-internal (rev1 rev2 ancestor-rev
 255                                           &optional startup-hooks)
 256 ;; Ediff-merge appropriate revisions of the selected file.
 257 ;; If REV1 is "" then use the latest revision.
 258 ;; If REV2 is "" then merge current buffer's file with REV1.
 259 ;; If ANCESTOR-REV is "" then use current buffer's file as ancestor.
 260 ;; If ANCESTOR-REV is nil, then merge without the ancestor.
 261   (let ((orig-buf (current-buffer))
 262         orig-file-name buf1 buf2 ancestor-buf)
 263
 264     (or (setq orig-file-name (buffer-file-name (current-buffer)))
 265         (error "Current buffer is not visiting any file"))
 266     (if (string= rev1 "") (setq rev1 nil)) ; latest revision
 267
 268     (setq buf1 (ediff-pcl-cvs-view-revision orig-file-name rev1))
 269     (setq buf2 (if (string= rev2 "")
 270                    orig-buf
 271                  (ediff-pcl-cvs-view-revision orig-file-name rev2)))
 272     (if (stringp ancestor-rev)
 273         (setq ancestor-buf
 274               (if (string= ancestor-rev "")
 275                   orig-buf
 276                 (ediff-pcl-cvs-view-revision orig-file-name ancestor-rev))))
 277
 278     (setq startup-hooks
 279           (cons
 280            (` (lambda ()
 281                 (delete-file (, (buffer-file-name buf1)))
 282                 (or (, (string= rev2 ""))
 283                     (delete-file (, (buffer-file-name buf2))))
 284                 (or (, (string= ancestor-rev ""))
 285                     (, (not ancestor-rev))
 286                     (delete-file (, (buffer-file-name ancestor-buf))))
 287                 ))
 288            startup-hooks))
 289
 290     (if ancestor-buf
 291         (ediff-merge-buffers-with-ancestor
 292          buf1 buf2 ancestor-buf startup-hooks
 293          'ediff-merge-revisions-with-ancestor)
 294       (ediff-merge-buffers
 295        buf1 buf2 startup-hooks 'ediff-merge-revisions))
 296     ))
 297
 298 (defun ediff-pcl-cvs-view-revision (file rev)
 299 ;; if rev = "", get the latest revision
 300   (let ((temp-name (make-temp-name
 301                     (concat ediff-temp-file-prefix
 302                             "ediff_" rev))))
 303     (cvs-kill-buffer-visiting temp-name)
 304     (if rev
 305         (message "Retrieving revision %s..." rev)
 306       (message "Retrieving latest revision..."))
 307     (let ((res (call-process cvs-shell nil nil nil "-c"
 308                              (concat cvs-program " update -p "
 309                                      (if rev
 310                                          (concat "-r " rev " ")
 311                                        "")
 312                                      file
 313                                      " > " temp-name))))
 314       (if (and res (not (and (integerp res) (zerop res))))
 315           (error "Failed to retrieve revision: %s" res))
 316
 317       (if rev
 318           (message "Retrieving revision %s... Done." rev)
 319         (message "Retrieving latest revision... Done."))
 320       (find-file-noselect temp-name))))
 321
 322
 323 (defun cvs-run-ediff-on-file-descriptor (tin)
 324 ;; This is a replacement for cvs-emerge-mode
 325 ;; Run after cvs-update.
 326 ;; Ediff-merge appropriate revisions of the selected file.
 327   (let* ((fileinfo (tin-cookie cvs-cookie-handle tin))
 328          (type (cvs-fileinfo->type fileinfo))
 329          (tmp-file
 330           (cvs-retrieve-revision-to-tmpfile fileinfo))
 331          ancestor-file)
 332
 333     (or (memq type '(MERGED CONFLICT MODIFIED))
 334         (error
 335          "Can only merge `Modified', `Merged' or `Conflict' files"))
 336
 337     (cond ((memq type '(MERGED CONFLICT))
 338            (setq ancestor-file
 339                  (cvs-retrieve-revision-to-tmpfile
 340                   fileinfo
 341                   ;; revision
 342                   (cvs-fileinfo->base-revision fileinfo)))
 343            (ediff-merge-buffers-with-ancestor
 344             (find-file-noselect tmp-file)
 345             (find-file-noselect (cvs-fileinfo->backup-file fileinfo))
 346             (find-file-noselect ancestor-file)
 347             nil ; startup-hooks
 348             'ediff-merge-revisions-with-ancestor))
 349           ((eq type 'MODIFIED)
 350            (ediff-merge-buffers
 351             (find-file-noselect tmp-file)
 352             (find-file-noselect (cvs-fileinfo->full-path fileinfo))
 353             nil ; startup-hooks
 354             'ediff-merge-revisions)))
 355     (if (stringp tmp-file) (delete-file tmp-file))
 356     (if (stringp ancestor-file) (delete-file ancestor-file))))
 357
 358 ;;; Local Variables:
 359 ;;; eval: (put 'ediff-defvar-local 'lisp-indent-hook 'defun)
 360 ;;; eval: (put 'ediff-eval-in-buffer 'lisp-indent-hook 1)
 361 ;;; End:
 362
 363 (provide 'ediff-vers)
 364
 365 ;;; ediff-vers.el ends here