lisp/ediff-vers.el

   1 ;;; ediff-vers.el --- version control interface to Ediff
   2
   3 ;; Copyright (C) 1995, 1996, 1997, 2002, 2003, 2004,
   4 ;;   2005 Free Software Foundation, Inc.
   5
   6 ;; Author: Michael Kifer <kifer@cs.stonybrook.edu>
   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 2, or (at your option)
  13 ;; 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; see the file COPYING.  If not, write to the
  22 ;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  23 ;; Boston, MA 02110-1301, USA.
  24
  25 ;;; Commentary:
  26
  27 ;;; Code:
  28
  29 ;; Compiler pacifier
  30 (defvar rcs-default-co-switches)
  31 (defvar sc-mode)
  32 (defvar cvs-shell)
  33 (defvar cvs-program)
  34 (defvar cvs-cookie-handle)
  35 (defvar ediff-temp-file-prefix)
  36
  37 (and noninteractive
  38      (eval-when-compile
  39        (let ((load-path (cons (expand-file-name ".") load-path)))
  40          (load "pcl-cvs" 'noerror)
  41          (load "rcs" 'noerror)
  42          ;; On 8+3 MS-DOS filesystems, generic-x.el is loaded
  43          ;; instead of (the missing) generic-sc.el.  Since the
  44          ;; version of Emacs which supports MS-DOS doesn't have
  45          ;; generic-sc, we simply avoid loading it.
  46          (or (and (fboundp 'msdos-long-file-names)
  47                   (not (msdos-long-file-names)))
  48              (load "generic-sc" 'noerror))
  49          ;; (load "vc" 'noerror) ; this sometimes causes compiler error
  50          (or (featurep 'ediff-init)
  51              (load "ediff-init.el" nil nil 'nosuffix))
  52          )))
  53 ;; end pacifier
  54
  55 ;; VC.el support
  56
  57 (defun ediff-vc-latest-version (file)
  58   "Return the version level of the latest version of FILE in repository."
  59   (if (fboundp 'vc-latest-version)
  60       (vc-latest-version file)
  61     (or (vc-file-getprop file 'vc-latest-version)
  62         (cond ((vc-backend file)
  63                (vc-call state file)
  64                (vc-file-getprop file 'vc-latest-version))
  65               (t (error "File %s is not under version control" file))))
  66     ))
  67
  68
  69 (defun ediff-vc-internal (rev1 rev2 &optional startup-hooks)
  70   ;; Run Ediff on versions of the current buffer.
  71   ;; If REV1 is "", use the latest version of the current buffer's file.
  72   ;; If REV2 is "" then compare current buffer with REV1.
  73   ;; If the current buffer is named `F', the version is named `F.~REV~'.
  74   ;; If `F.~REV~' already exists, it is used instead of being re-created.
  75   (let (file1 file2 rev1buf rev2buf)
  76     (if (string= rev1 "")
  77         (setq rev1 (ediff-vc-latest-version (buffer-file-name))))
  78     (save-window-excursion
  79       (save-excursion
  80         (vc-version-other-window rev1)
  81         (setq rev1buf (current-buffer)
  82               file1 (buffer-file-name)))
  83       (save-excursion
  84         (or (string= rev2 "")           ; use current buffer
  85             (vc-version-other-window rev2))
  86         (setq rev2buf (current-buffer)
  87               file2 (buffer-file-name)))
  88       (setq startup-hooks
  89             (cons `(lambda ()
  90                      (delete-file ,file1)
  91                      (or ,(string= rev2 "") (delete-file ,file2)))
  92                   startup-hooks)))
  93     (ediff-buffers
  94      rev1buf rev2buf
  95      startup-hooks
  96      'ediff-revision)))
  97
  98 ;; RCS.el support
  99 (defun rcs-ediff-view-revision (&optional rev)
 100 ;; View previous RCS revision of current file.
 101 ;; With prefix argument, prompts for a revision name.
 102   (interactive (list (if current-prefix-arg
 103                          (read-string "Revision: "))))
 104   (let* ((filename (buffer-file-name (current-buffer)))
 105          (switches (append '("-p")
 106                            (if rev (list (concat "-r" rev)) nil)))
 107          (buff (concat (file-name-nondirectory filename) ".~" rev "~")))
 108     (message "Working ...")
 109     (setq filename (expand-file-name filename))
 110     (with-output-to-temp-buffer buff
 111       (ediff-with-current-buffer standard-output
 112         (fundamental-mode))
 113       (let ((output-buffer (ediff-rcs-get-output-buffer filename buff)))
 114         (delete-windows-on output-buffer)
 115         (save-excursion
 116           (set-buffer output-buffer)
 117           (apply 'call-process "co" nil t nil
 118                  ;; -q: quiet (no diagnostics)
 119                  (append switches rcs-default-co-switches
 120                          (list "-q" filename)))))
 121       (message "")
 122       buff)))
 123
 124 (defun ediff-rcs-get-output-buffer (file name)
 125   ;; Get a buffer for RCS output for FILE, make it writable and clean it up.
 126   ;; Optional NAME is name to use instead of `*RCS-output*'.
 127   ;; This is a modified version from rcs.el v1.1.  I use it here to make
 128   ;; Ediff immune to changes in rcs.el
 129   (let* ((default-major-mode 'fundamental-mode) ; no frills!
 130          (buf (get-buffer-create name)))
 131     (save-excursion
 132       (set-buffer buf)
 133       (setq buffer-read-only nil
 134             default-directory (file-name-directory (expand-file-name file)))
 135       (erase-buffer))
 136     buf))
 137
 138 (defun ediff-rcs-internal (rev1 rev2 &optional startup-hooks)
 139 ;; Run Ediff on versions of the current buffer.
 140 ;; If REV2 is "" then use current buffer.
 141   (let (rev2buf rev1buf)
 142     (save-window-excursion
 143       (setq rev2buf (if (string= rev2 "")
 144                         (current-buffer)
 145                       (rcs-ediff-view-revision rev2))
 146             rev1buf (rcs-ediff-view-revision rev1)))
 147
 148     ;; rcs.el doesn't create temp version files, so we don't have to delete
 149     ;; anything in startup hooks to ediff-buffers
 150     (ediff-buffers rev1buf rev2buf startup-hooks 'ediff-revision)
 151     ))
 152
 153
 154 ;; GENERIC-SC.el support
 155
 156 (defun generic-sc-get-latest-rev ()
 157   (cond ((eq sc-mode 'CCASE)
 158          (eval "main/LATEST"))
 159         (t (eval ""))))
 160
 161 (defun ediff-generic-sc-internal (rev1 rev2 &optional startup-hooks)
 162 ;; Run Ediff on versions of the current buffer.
 163 ;; If REV2 is "" then compare current buffer with REV1.
 164 ;; If the current buffer is named `F', the version is named `F.~REV~'.
 165 ;; If `F.~REV~' already exists, it is used instead of being re-created.
 166   (let (rev1buf rev2buf)
 167     (save-excursion
 168       (if (or (not rev1) (string= rev1 ""))
 169           (setq rev1 (generic-sc-get-latest-rev)))
 170       (sc-visit-previous-revision rev1)
 171       (setq rev1buf (current-buffer)))
 172     (save-excursion
 173       (or (string= rev2 "")             ; use current buffer
 174           (sc-visit-previous-revision rev2))
 175       (setq rev2buf (current-buffer)))
 176     (ediff-buffers rev1buf rev2buf startup-hooks 'ediff-revision)))
 177
 178
 179 ;;; Merge with Version Control
 180
 181 (defun ediff-vc-merge-internal (rev1 rev2 ancestor-rev
 182                                      &optional startup-hooks merge-buffer-file)
 183 ;; If ANCESTOR-REV non-nil, merge with ancestor
 184   (let (buf1 buf2 ancestor-buf)
 185     (save-window-excursion
 186       (save-excursion
 187         (vc-version-other-window rev1)
 188         (setq buf1 (current-buffer)))
 189       (save-excursion
 190         (or (string= rev2 "")
 191             (vc-version-other-window rev2))
 192         (setq buf2 (current-buffer)))
 193       (if ancestor-rev
 194           (save-excursion
 195             (if (string= ancestor-rev "")
 196                 (setq ancestor-rev (vc-workfile-version buffer-file-name)))
 197             (vc-version-other-window ancestor-rev)
 198             (setq ancestor-buf (current-buffer))))
 199       (setq startup-hooks
 200             (cons
 201              `(lambda ()
 202                 (delete-file ,(buffer-file-name buf1))
 203                 (or ,(string= rev2 "")
 204                     (delete-file ,(buffer-file-name buf2)))
 205                 (or ,(string= ancestor-rev "")
 206                     ,(not ancestor-rev)
 207                     (delete-file ,(buffer-file-name ancestor-buf)))
 208                 )
 209              startup-hooks)))
 210     (if ancestor-rev
 211         (ediff-merge-buffers-with-ancestor
 212          buf1 buf2 ancestor-buf
 213          startup-hooks 'ediff-merge-revisions-with-ancestor merge-buffer-file)
 214       (ediff-merge-buffers
 215        buf1 buf2 startup-hooks 'ediff-merge-revisions merge-buffer-file))
 216     ))
 217
 218 (defun ediff-rcs-merge-internal (rev1 rev2 ancestor-rev
 219                                       &optional
 220                                       startup-hooks merge-buffer-file)
 221   ;; If ANCESTOR-REV non-nil, merge with ancestor
 222   (let (buf1 buf2 ancestor-buf)
 223     (save-window-excursion
 224       (setq buf1 (rcs-ediff-view-revision rev1)
 225             buf2 (if (string= rev2 "")
 226                      (current-buffer)
 227                    (rcs-ediff-view-revision rev2))
 228             ancestor-buf (if ancestor-rev
 229                              (if (string= ancestor-rev "")
 230                                  (current-buffer)
 231                                (rcs-ediff-view-revision ancestor-rev)))))
 232     ;; rcs.el doesn't create temp version files, so we don't have to delete
 233     ;; anything in startup hooks to ediff-buffers
 234     (if ancestor-rev
 235         (ediff-merge-buffers-with-ancestor
 236          buf1 buf2 ancestor-buf
 237          startup-hooks 'ediff-merge-revisions-with-ancestor merge-buffer-file)
 238       (ediff-merge-buffers
 239        buf1 buf2 startup-hooks 'ediff-merge-revisions merge-buffer-file))))
 240
 241 (defun ediff-generic-sc-merge-internal (rev1 rev2 ancestor-rev
 242                                              &optional
 243                                              startup-hooks merge-buffer-file)
 244   ;; If ANCESTOR-REV non-nil, merge with ancestor
 245   (let (buf1 buf2 ancestor-buf)
 246     (save-excursion
 247       (if (string= rev1 "")
 248           (setq rev1 (generic-sc-get-latest-rev)))
 249       (sc-visit-previous-revision rev1)
 250       (setq buf1 (current-buffer)))
 251     (save-excursion
 252       (or (string= rev2 "")
 253           (sc-visit-previous-revision rev2))
 254       (setq buf2 (current-buffer)))
 255     (if ancestor-rev
 256         (save-excursion
 257           (or (string= ancestor-rev "")
 258               (sc-visit-previous-revision ancestor-rev))
 259           (setq ancestor-buf (current-buffer))))
 260     (if ancestor-rev
 261         (ediff-merge-buffers-with-ancestor
 262          buf1 buf2 ancestor-buf
 263          startup-hooks 'ediff-merge-revisions-with-ancestor merge-buffer-file)
 264       (ediff-merge-buffers
 265        buf1 buf2 startup-hooks 'ediff-merge-revisions merge-buffer-file))))
 266
 267
 268 ;; PCL-CVS.el support
 269
 270 ;; MK: Check. This function doesn't seem to be used any more by pcvs or pcl-cvs
 271 (defun cvs-run-ediff-on-file-descriptor (tin)
 272 ;; This is a replacement for cvs-emerge-mode
 273 ;; Runs after cvs-update.
 274 ;; Ediff-merge appropriate revisions of the selected file.
 275   (let* ((fileinfo (tin-cookie cvs-cookie-handle tin))
 276          (type (cvs-fileinfo->type fileinfo))
 277          (tmp-file
 278           (cvs-retrieve-revision-to-tmpfile fileinfo))
 279          (default-directory
 280            (file-name-as-directory (cvs-fileinfo->dir fileinfo)))
 281          ancestor-file)
 282
 283     (or (memq type '(MERGED CONFLICT MODIFIED))
 284         (error
 285          "Can only merge `Modified', `Merged' or `Conflict' files"))
 286
 287     (cond ((memq type '(MERGED CONFLICT))
 288            (setq ancestor-file
 289                  (cvs-retrieve-revision-to-tmpfile
 290                   fileinfo
 291                   ;; revision
 292                   (cvs-fileinfo->base-revision fileinfo)))
 293            (ediff-merge-buffers-with-ancestor
 294             (find-file-noselect tmp-file)
 295             (find-file-noselect (cvs-fileinfo->backup-file fileinfo))
 296             (find-file-noselect ancestor-file)
 297             nil ; startup-hooks
 298             'ediff-merge-revisions-with-ancestor))
 299           ((eq type 'MODIFIED)
 300            (ediff-buffers
 301             (find-file-noselect tmp-file)
 302             (if (featurep 'xemacs)
 303                 ;; XEmacs doesn't seem to have cvs-fileinfo->full-name
 304                 (find-file-noselect (cvs-fileinfo->full-path fileinfo))
 305               (find-file-noselect (cvs-fileinfo->full-name fileinfo)))
 306             nil ; startup-hooks
 307             'ediff-revisions)))
 308     (if (stringp tmp-file) (delete-file tmp-file))
 309     (if (stringp ancestor-file) (delete-file ancestor-file))))
 310
 311
 312 (provide 'ediff-vers)
 313
 314 ;;; Local Variables:
 315 ;;; eval: (put 'ediff-defvar-local 'lisp-indent-hook 'defun)
 316 ;;; eval: (put 'ediff-with-current-buffer 'lisp-indent-hook 1)
 317 ;;; eval: (put 'ediff-with-current-buffer 'edebug-form-spec '(form body))
 318 ;;; End:
 319
 320 ;;; arch-tag: bbb34f0c-2a90-426a-a77a-c75f479ebbbf
 321 ;;; ediff-vers.el ends here