lisp/ediff-vers.el

   1 ;;; ediff-vers.el --- version control interface to Ediff
   2
   3 ;; Copyright (C) 1995, 1996, 1997, 2001, 2002, 2003, 2004,
   4 ;;   2005, 2006, 2007, 2008 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 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 ;;; Code:
  26
  27 ;; Compiler pacifier
  28 (defvar rcs-default-co-switches)
  29
  30 (and noninteractive
  31      (eval-when-compile
  32        (condition-case nil
  33            ;; for compatibility with current stable version of xemacs
  34            (progn
  35              ;;(require 'pcvs nil 'noerror)
  36              ;;(require 'rcs nil 'noerror)
  37              (require 'pcvs)
  38              (require 'rcs))
  39          (error nil))
  40        (require 'vc)
  41        (require 'ediff-init)
  42        ))
  43 ;; end pacifier
  44
  45 (defcustom ediff-keep-tmp-versions nil
  46   "*If t, do not delete temporary previous versions for the files on which
  47 comparison or merge operations are being performed."
  48   :type 'boolean
  49   :group 'ediff-vers
  50   )
  51
  52 (defalias 'ediff-vc-revision-other-window
  53       (if (fboundp 'vc-revision-other-window)
  54           'vc-revision-other-window
  55         'vc-version-other-window))
  56
  57 (defalias 'ediff-vc-working-revision
  58   (if (fboundp 'vc-working-revision)
  59       'vc-working-revision
  60     'vc-workfile-version))
  61
  62 ;; VC.el support
  63
  64 (eval-when-compile
  65   (require 'vc-hooks)) ;; for vc-call macro
  66
  67
  68 (defun ediff-vc-latest-version (file)
  69   "Return the version level of the latest version of FILE in repository."
  70   (if (fboundp 'vc-latest-version)
  71       (vc-latest-version file)
  72     (or (vc-file-getprop file 'vc-latest-version)
  73         (cond ((vc-backend file)
  74                (vc-call state file)
  75                (vc-file-getprop file 'vc-latest-version))
  76               (t (error "File %s is not under version control" file))))
  77     ))
  78
  79
  80 (defun ediff-vc-internal (rev1 rev2 &optional startup-hooks)
  81   ;; Run Ediff on versions of the current buffer.
  82   ;; If REV1 is "", use the latest version of the current buffer's file.
  83   ;; If REV2 is "" then compare current buffer with REV1.
  84   ;; If the current buffer is named `F', the version is named `F.~REV~'.
  85   ;; If `F.~REV~' already exists, it is used instead of being re-created.
  86   (let (file1 file2 rev1buf rev2buf)
  87     (if (string= rev1 "")
  88         (setq rev1 (ediff-vc-latest-version (buffer-file-name))))
  89     (save-window-excursion
  90       (save-excursion
  91         (ediff-vc-revision-other-window rev1)
  92         (setq rev1buf (current-buffer)
  93               file1 (buffer-file-name)))
  94       (save-excursion
  95         (or (string= rev2 "")           ; use current buffer
  96             (ediff-vc-revision-other-window rev2))
  97         (setq rev2buf (current-buffer)
  98               file2 (buffer-file-name)))
  99       (setq startup-hooks
 100             (cons `(lambda ()
 101                      (ediff-delete-version-file ,file1)
 102                      (or ,(string= rev2 "") (ediff-delete-version-file ,file2)))
 103                   startup-hooks)))
 104     (ediff-buffers
 105      rev1buf rev2buf
 106      startup-hooks
 107      'ediff-revision)))
 108
 109 ;; RCS.el support
 110 (defun rcs-ediff-view-revision (&optional rev)
 111 ;; View previous RCS revision of current file.
 112 ;; With prefix argument, prompts for a revision name.
 113   (interactive (list (if current-prefix-arg
 114                          (read-string "Revision: "))))
 115   (let* ((filename (buffer-file-name (current-buffer)))
 116          (switches (append '("-p")
 117                            (if rev (list (concat "-r" rev)) nil)))
 118          (buff (concat (file-name-nondirectory filename) ".~" rev "~")))
 119     (message "Working ...")
 120     (setq filename (expand-file-name filename))
 121     (with-output-to-temp-buffer buff
 122       (ediff-with-current-buffer standard-output
 123         (fundamental-mode))
 124       (let ((output-buffer (ediff-rcs-get-output-buffer filename buff)))
 125         (delete-windows-on output-buffer)
 126         (save-excursion
 127           (set-buffer output-buffer)
 128           (apply 'call-process "co" nil t nil
 129                  ;; -q: quiet (no diagnostics)
 130                  (append switches rcs-default-co-switches
 131                          (list "-q" filename)))))
 132       (message "")
 133       buff)))
 134
 135 (defun ediff-rcs-get-output-buffer (file name)
 136   ;; Get a buffer for RCS output for FILE, make it writable and clean it up.
 137   ;; Optional NAME is name to use instead of `*RCS-output*'.
 138   ;; This is a modified version from rcs.el v1.1.  I use it here to make
 139   ;; Ediff immune to changes in rcs.el
 140   (let* ((default-major-mode 'fundamental-mode) ; no frills!
 141          (buf (get-buffer-create name)))
 142     (save-excursion
 143       (set-buffer buf)
 144       (setq buffer-read-only nil
 145             default-directory (file-name-directory (expand-file-name file)))
 146       (erase-buffer))
 147     buf))
 148
 149 (defun ediff-rcs-internal (rev1 rev2 &optional startup-hooks)
 150 ;; Run Ediff on versions of the current buffer.
 151 ;; If REV2 is "" then use current buffer.
 152   (let (rev2buf rev1buf)
 153     (save-window-excursion
 154       (setq rev2buf (if (string= rev2 "")
 155                         (current-buffer)
 156                       (rcs-ediff-view-revision rev2))
 157             rev1buf (rcs-ediff-view-revision rev1)))
 158
 159     ;; rcs.el doesn't create temp version files, so we don't have to delete
 160     ;; anything in startup hooks to ediff-buffers
 161     (ediff-buffers rev1buf rev2buf startup-hooks 'ediff-revision)
 162     ))
 163
 164 ;;; Merge with Version Control
 165
 166 (defun ediff-vc-merge-internal (rev1 rev2 ancestor-rev
 167                                      &optional startup-hooks merge-buffer-file)
 168 ;; If ANCESTOR-REV non-nil, merge with ancestor
 169   (let (buf1 buf2 ancestor-buf)
 170     (save-window-excursion
 171       (save-excursion
 172         (ediff-vc-revision-other-window rev1)
 173         (setq buf1 (current-buffer)))
 174       (save-excursion
 175         (or (string= rev2 "")
 176             (ediff-vc-revision-other-window rev2))
 177         (setq buf2 (current-buffer)))
 178       (if ancestor-rev
 179           (save-excursion
 180             (if (string= ancestor-rev "")
 181                 (setq ancestor-rev (ediff-vc-working-revision buffer-file-name)))
 182             (ediff-vc-revision-other-window ancestor-rev)
 183             (setq ancestor-buf (current-buffer))))
 184       (setq startup-hooks
 185             (cons
 186              `(lambda ()
 187                 (ediff-delete-version-file ,(buffer-file-name buf1))
 188                 (or ,(string= rev2 "")
 189                     (ediff-delete-version-file ,(buffer-file-name buf2)))
 190                 (or ,(string= ancestor-rev "")
 191                     ,(not ancestor-rev)
 192                     (ediff-delete-version-file ,(buffer-file-name ancestor-buf)))
 193                 )
 194              startup-hooks)))
 195     (if ancestor-rev
 196         (ediff-merge-buffers-with-ancestor
 197          buf1 buf2 ancestor-buf
 198          startup-hooks 'ediff-merge-revisions-with-ancestor merge-buffer-file)
 199       (ediff-merge-buffers
 200        buf1 buf2 startup-hooks 'ediff-merge-revisions merge-buffer-file))
 201     ))
 202
 203 (defun ediff-rcs-merge-internal (rev1 rev2 ancestor-rev
 204                                       &optional
 205                                       startup-hooks merge-buffer-file)
 206   ;; If ANCESTOR-REV non-nil, merge with ancestor
 207   (let (buf1 buf2 ancestor-buf)
 208     (save-window-excursion
 209       (setq buf1 (rcs-ediff-view-revision rev1)
 210             buf2 (if (string= rev2 "")
 211                      (current-buffer)
 212                    (rcs-ediff-view-revision rev2))
 213             ancestor-buf (if ancestor-rev
 214                              (if (string= ancestor-rev "")
 215                                  (current-buffer)
 216                                (rcs-ediff-view-revision ancestor-rev)))))
 217     ;; rcs.el doesn't create temp version files, so we don't have to delete
 218     ;; anything in startup hooks to ediff-buffers
 219     (if ancestor-rev
 220         (ediff-merge-buffers-with-ancestor
 221          buf1 buf2 ancestor-buf
 222          startup-hooks 'ediff-merge-revisions-with-ancestor merge-buffer-file)
 223       (ediff-merge-buffers
 224        buf1 buf2 startup-hooks 'ediff-merge-revisions merge-buffer-file))))
 225
 226
 227 ;; delete version file on exit unless ediff-keep-tmp-versions is true
 228 (defun ediff-delete-version-file (file)
 229   (or ediff-keep-tmp-versions (delete-file file)))
 230
 231
 232 (provide 'ediff-vers)
 233
 234
 235 ;;; Local Variables:
 236 ;;; eval: (put 'ediff-defvar-local 'lisp-indent-hook 'defun)
 237 ;;; eval: (put 'ediff-with-current-buffer 'lisp-indent-hook 1)
 238 ;;; eval: (put 'ediff-with-current-buffer 'edebug-form-spec '(form body))
 239 ;;; End:
 240
 241 ;; arch-tag: bbb34f0c-2a90-426a-a77a-c75f479ebbbf
 242 ;;; ediff-vers.el ends here