;;; ediff-vers.el --- version control interface to Ediff -*- lexical-binding:t -*-
;; Copyright (C) 1995-1997, 2001-2024 Free Software Foundation, Inc.
;; Author: Michael Kifer <kifer@cs.stonybrook.edu>
;; Package: ediff
;; This file is part of GNU Emacs.
;; GNU Emacs is free software: you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation, either version 3 of the License, or
;; (at your option) any later version.
;; GNU Emacs is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;; GNU General Public License for more details.
;; You should have received a copy of the GNU General Public License
;; along with GNU Emacs. If not, see <https://www.gnu.org/licenses/>.
;;; Commentary:
;;; Code:
(eval-when-compile (require 'ediff-init))
(defvar rcs-default-co-switches)
(defcustom ediff-keep-tmp-versions nil
"If t, do not delete temporary previous versions for the files on which
comparison or merge operations are being performed."
:type 'boolean
:group 'ediff-vers
)
(define-obsolete-function-alias 'ediff-vc-revision-other-window
#'vc-revision-other-window "28.1")
(define-obsolete-function-alias 'ediff-vc-working-revision
#'vc-working-revision "28.1")
;; VC.el support
(eval-when-compile
(require 'vc-hooks)) ;; for vc-call macro
(defun ediff-vc-latest-version (file)
"Return the version level of the latest version of FILE in repository."
(if (fboundp 'vc-latest-version)
(vc-latest-version file)
(or (vc-file-getprop file 'vc-latest-revision)
(cond ((vc-backend file)
(vc-call state file)
(vc-file-getprop file 'vc-latest-revision))
(t (error "File %s is not under version control" file))))
))
(defun ediff-vc-internal (rev1 rev2 &optional startup-hooks)
;; Run Ediff on versions of the current buffer.
;; If REV1 is "", use the latest version of the current buffer's file.
;; If REV2 is "" then compare current buffer with REV1.
;; If the current buffer is named `F', the version is named `F.~REV~'.
;; If `F.~REV~' already exists, it is used instead of being re-created.
(let (file1 file2 rev1buf rev2buf)
(if (string= rev1 "")
(setq rev1 (ediff-vc-latest-version (buffer-file-name))))
(save-window-excursion
(save-excursion
(vc-revision-other-window rev1)
(setq rev1buf (current-buffer)
file1 (buffer-file-name)))
(save-excursion
(or (string= rev2 "") ; use current buffer
(vc-revision-other-window rev2))
(setq rev2buf (current-buffer)
file2 (buffer-file-name)))
(push (lambda ()
(ediff-delete-version-file file1)
(or (string= rev2 "") (ediff-delete-version-file file2)))
startup-hooks))
(ediff-buffers
rev1buf rev2buf
startup-hooks
'ediff-revision)))
;; RCS.el support
(defun rcs-ediff-view-revision (&optional rev)
"View previous RCS revision of current file.
With prefix argument, prompts for a revision name."
(interactive (list (if current-prefix-arg
(read-string "Revision: "))))
(let* ((filename (buffer-file-name (current-buffer)))
(switches (append '("-p")
(if rev (list (concat "-r" rev)) nil)))
(buff (concat (file-name-nondirectory filename) ".~" rev "~")))
(message "Working ...")
(setq filename (expand-file-name filename))
(with-output-to-temp-buffer buff
(ediff-with-current-buffer standard-output
(fundamental-mode))
(let ((output-buffer (ediff-rcs-get-output-buffer filename buff)))
(delete-windows-on output-buffer)
(with-current-buffer output-buffer
(apply #'call-process "co" nil t nil
;; -q: quiet (no diagnostics)
(append switches rcs-default-co-switches
(list "-q" filename)))))
(message "")
buff)))
(defun ediff-rcs-get-output-buffer (file name)
;; Get a buffer for RCS output for FILE, make it writable and clean it up.
;; Optional NAME is name to use instead of `*RCS-output*'.
;; This is a modified version from rcs.el v1.1. I use it here to make
;; Ediff immune to changes in rcs.el
(let ((buf (get-buffer-create name)))
(with-current-buffer buf
(setq buffer-read-only nil
default-directory (file-name-directory (expand-file-name file)))
(erase-buffer))
buf))
(defun ediff-rcs-internal (rev1 rev2 &optional startup-hooks)
;; Run Ediff on versions of the current buffer.
;; If REV2 is "" then use current buffer.
(let (rev2buf rev1buf)
(save-window-excursion
(setq rev2buf (if (string= rev2 "")
(current-buffer)
(rcs-ediff-view-revision rev2))
rev1buf (rcs-ediff-view-revision rev1)))
;; rcs.el doesn't create temp version files, so we don't have to delete
;; anything in startup hooks to ediff-buffers
(ediff-buffers rev1buf rev2buf startup-hooks 'ediff-revision)
))
;;; Merge with Version Control
(defun ediff-vc-merge-internal (rev1 rev2 ancestor-rev
&optional startup-hooks merge-buffer-file)
;; If ANCESTOR-REV non-nil, merge with ancestor
(let (buf1 buf2 ancestor-buf)
(save-window-excursion
(save-excursion
(vc-revision-other-window rev1)
(setq buf1 (current-buffer)))
(save-excursion
(or (string= rev2 "")
(vc-revision-other-window rev2))
(setq buf2 (current-buffer)))
(if ancestor-rev
(save-excursion
(if (string= ancestor-rev "")
(setq ancestor-rev (vc-working-revision
buffer-file-name)))
(vc-revision-other-window ancestor-rev)
(setq ancestor-buf (current-buffer))))
(push (let ((f1 (buffer-file-name buf1))
(f2 (unless (string= rev2 "") (buffer-file-name buf2)))
(fa (unless (or (string= ancestor-rev "")
(not ancestor-rev))
(buffer-file-name ancestor-buf))))
(lambda ()
(ediff-delete-version-file f1)
(if f2 (ediff-delete-version-file f2))
(if fa (ediff-delete-version-file fa))))
startup-hooks))
(if ancestor-rev
(ediff-merge-buffers-with-ancestor
buf1 buf2 ancestor-buf
startup-hooks 'ediff-merge-revisions-with-ancestor merge-buffer-file)
(ediff-merge-buffers
buf1 buf2 startup-hooks 'ediff-merge-revisions merge-buffer-file))
))
(defun ediff-rcs-merge-internal (rev1 rev2 ancestor-rev
&optional
startup-hooks merge-buffer-file)
;; If ANCESTOR-REV non-nil, merge with ancestor
(let (buf1 buf2 ancestor-buf)
(save-window-excursion
(setq buf1 (rcs-ediff-view-revision rev1)
buf2 (if (string= rev2 "")
(current-buffer)
(rcs-ediff-view-revision rev2))
ancestor-buf (if ancestor-rev
(if (string= ancestor-rev "")
(current-buffer)
(rcs-ediff-view-revision ancestor-rev)))))
;; rcs.el doesn't create temp version files, so we don't have to delete
;; anything in startup hooks to ediff-buffers
(if ancestor-rev
(ediff-merge-buffers-with-ancestor
buf1 buf2 ancestor-buf
startup-hooks 'ediff-merge-revisions-with-ancestor merge-buffer-file)
(ediff-merge-buffers
buf1 buf2 startup-hooks 'ediff-merge-revisions merge-buffer-file))))
;; delete version file on exit unless ediff-keep-tmp-versions is true
(defun ediff-delete-version-file (file)
(or ediff-keep-tmp-versions (delete-file file)))
(provide 'ediff-vers)
;;; ediff-vers.el ends here