;;; vc.el --- drive a version-control system from within Emacs
-;; Copyright (C) 1992, 1993, 1994, 1995, 1996, 1997, 1998, 2000,
-;; 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010
-;; Free Software Foundation, Inc.
+;; Copyright (C) 1992-1998, 2000-2011 Free Software Foundation, Inc.
;; Author: FSF (see below for full credits)
;; Maintainer: Andre Spiegel <spiegel@gnu.org>
;; In the list of functions below, each identifier needs to be prepended
;; with `vc-sys-'. Some of the functions are mandatory (marked with a
;; `*'), others are optional (`-').
-;;
+
;; BACKEND PROPERTIES
;;
;; * revision-granularity
;; that return 'file have per-file revision numbering; backends
;; that return 'repository have per-repository revision numbering,
;; so a revision level implicitly identifies a changeset
-;;
+
;; STATE-QUERYING FUNCTIONS
;;
;; * registered (file)
;;
;; - merge (file rev1 rev2)
;;
-;; Merge the changes between REV1 and REV2 into the current working file.
+;; Merge the changes between REV1 and REV2 into the current working file
+;; (for non-distributed VCS).
+;;
+;; - merge-branch ()
+;;
+;; Merge another branch into the current one, prompting for a
+;; location to merge from.
;;
;; - merge-news (file)
;;
;; Merge recent changes from the current branch into FILE.
+;; (for non-distributed VCS).
+;;
+;; - pull (prompt)
+;;
+;; Pull "upstream" changes into the current branch (for distributed
+;; VCS). If PROMPT is non-nil, or if necessary, prompt for a
+;; location to pull from.
;;
;; - steal-lock (file &optional revision)
;;
;;
;; Mark conflicts as resolved. Some VC systems need to run a
;; command to mark conflicts as resolved.
-;;
+
;; HISTORY FUNCTIONS
;;
;; * print-log (files buffer &optional shortlog start-revision limit)
;; If the backend supports annotating through copies and renames,
;; and displays a file name and a revision, then return a cons
;; (REVISION . FILENAME).
-;;
+
;; TAG SYSTEM
;;
;; - create-tag (dir name branchp)
;; does a sanity check whether there aren't any uncommitted changes at
;; or below DIR, and then performs a tree walk, using the `checkout'
;; function to retrieve the corresponding revisions.
-;;
+
;; MISCELLANEOUS
;;
;; - make-version-backups-p (file)
;;;###autoload
(defun vc-merge ()
- "Merge changes between two revisions into the current buffer's file.
-This asks for two revisions to merge from in the minibuffer. If the
-first revision is a branch number, then merge all changes from that
-branch. If the first revision is empty, merge news, i.e. recent changes
-from the current branch.
-
-See Info node `Merging'."
+ "Perform a version control merge operation.
+On a distributed version control system, this runs a \"merge\"
+operation to incorporate changes from another branch onto the
+current branch, prompting for an argument list.
+
+On a non-distributed version control system, this merges changes
+between two revisions into the current fileset. This asks for
+two revisions to merge from in the minibuffer. If the first
+revision is a branch number, then merge all changes from that
+branch. If the first revision is empty, merge the most recent
+changes from the current branch."
(interactive)
- (vc-ensure-vc-buffer)
- (vc-buffer-sync)
- (let* ((file buffer-file-name)
- (backend (vc-backend file))
- (state (vc-state file))
- first-revision second-revision status)
+ (let* ((vc-fileset (vc-deduce-fileset t))
+ (backend (car vc-fileset))
+ (files (cadr vc-fileset)))
(cond
- ((stringp state) ;; Locking VCses only
- (error "File is locked by %s" state))
- ((not (vc-editable-p file))
- (if (y-or-n-p
- "File must be checked out for merging. Check out now? ")
- (vc-checkout file t)
- (error "Merge aborted"))))
- (setq first-revision
- (vc-read-revision
- (concat "Branch or revision to merge from "
- "(default news on current branch): ")
- (list file)
- backend))
- (if (string= first-revision "")
- (setq status (vc-call-backend backend 'merge-news file))
- (if (not (vc-find-backend-function backend 'merge))
- (error "Sorry, merging is not implemented for %s" backend)
- (if (not (vc-branch-p first-revision))
- (setq second-revision
- (vc-read-revision
- "Second revision: "
- (list file) backend nil
- ;; FIXME: This is CVS/RCS/SCCS specific.
- (concat (vc-branch-part first-revision) ".")))
- ;; We want to merge an entire branch. Set revisions
- ;; accordingly, so that vc-BACKEND-merge understands us.
- (setq second-revision first-revision)
- ;; first-revision must be the starting point of the branch
- (setq first-revision (vc-branch-part first-revision)))
- (setq status (vc-call-backend backend 'merge file
- first-revision second-revision))))
- (vc-maybe-resolve-conflicts file status "WORKFILE" "MERGE SOURCE")))
+ ;; If a branch-merge operation is defined, use it.
+ ((vc-find-backend-function backend 'merge-branch)
+ (vc-call-backend backend 'merge-branch))
+ ;; Otherwise, do a per-file merge.
+ ((vc-find-backend-function backend 'merge)
+ (vc-buffer-sync)
+ (dolist (file files)
+ (let* ((state (vc-state file))
+ first-revision second-revision status)
+ (cond
+ ((stringp state) ;; Locking VCses only
+ (error "File %s is locked by %s" file state))
+ ((not (vc-editable-p file))
+ (vc-checkout file t)))
+ (setq first-revision
+ (vc-read-revision
+ (concat "Merge " file
+ "from branch or revision "
+ "(default news on current branch): ")
+ (list file)
+ backend))
+ (cond
+ ((string= first-revision "")
+ (setq status (vc-call-backend backend 'merge-news file)))
+ (t
+ (if (not (vc-branch-p first-revision))
+ (setq second-revision
+ (vc-read-revision
+ "Second revision: "
+ (list file) backend nil
+ ;; FIXME: This is CVS/RCS/SCCS specific.
+ (concat (vc-branch-part first-revision) ".")))
+ ;; We want to merge an entire branch. Set revisions
+ ;; accordingly, so that vc-BACKEND-merge understands us.
+ (setq second-revision first-revision)
+ ;; first-revision must be the starting point of the branch
+ (setq first-revision (vc-branch-part first-revision)))
+ (setq status (vc-call-backend backend 'merge file
+ first-revision second-revision))))
+ (vc-maybe-resolve-conflicts file status "WORKFILE" "MERGE SOURCE"))))
+ (t
+ (error "Sorry, merging is not implemented for %s" backend)))))
+
(defun vc-maybe-resolve-conflicts (file status &optional name-A name-B)
(vc-resynch-buffer file t (not (buffer-modified-p)))
(goto-char (point-max))
(lexical-let ((working-revision working-revision)
(limit limit))
- (widget-create 'push-button
- :notify (lambda (&rest ignore)
- (vc-print-log-internal
- log-view-vc-backend log-view-vc-fileset
- working-revision nil (* 2 limit)))
- :help-echo "Show the log again, and double the number of log entries shown"
- "Show 2X entries")
- (widget-insert " ")
- (widget-create 'push-button
- :notify (lambda (&rest ignore)
- (vc-print-log-internal
- log-view-vc-backend log-view-vc-fileset
- working-revision nil nil))
- :help-echo "Show the log again, showing all entries"
- "Show unlimited entries"))
- (widget-setup)))
+ (insert "\n")
+ (insert-text-button "Show 2X entries"
+ 'action (lambda (&rest ignore)
+ (vc-print-log-internal
+ log-view-vc-backend log-view-vc-fileset
+ working-revision nil (* 2 limit)))
+ 'help-echo "Show the log again, and double the number of log entries shown")
+ (insert " ")
+ (insert-text-button "Show unlimited entries"
+ 'action (lambda (&rest ignore)
+ (vc-print-log-internal
+ log-view-vc-backend log-view-vc-fileset
+ working-revision nil nil))
+ 'help-echo "Show the log again, including all entries"))))
(defun vc-print-log-internal (backend files working-revision
&optional is-start-revision limit)
(define-obsolete-function-alias 'vc-revert-buffer 'vc-revert "23.1")
;;;###autoload
-(defun vc-update ()
- "Update the current fileset's files to their tip revisions.
-For each one that contains no changes, and is not locked, then this simply
-replaces the work file with the latest revision on its branch. If the file
-contains changes, and the backend supports merging news, then any recent
-changes from the current branch are merged into the working file."
- (interactive)
- (let* ((vc-fileset (vc-deduce-fileset))
+(defun vc-pull (&optional arg)
+ "Update the current fileset or branch.
+On a distributed version control system, this runs a \"pull\"
+operation to update the current branch, prompting for an argument
+list if required. Optional prefix ARG forces a prompt.
+
+On a non-distributed version control system, update the current
+fileset to the tip revisions. For each unchanged and unlocked
+file, this simply replaces the work file with the latest revision
+on its branch. If the file contains changes, any changes in the
+tip revision are merged into the working file."
+ (interactive "P")
+ (let* ((vc-fileset (vc-deduce-fileset t))
(backend (car vc-fileset))
(files (cadr vc-fileset)))
- (save-some-buffers ; save buffers visiting files
- nil (lambda ()
- (and (buffer-modified-p)
- (let ((file (buffer-file-name)))
- (and file (member file files))))))
- (dolist (file files)
- (if (vc-up-to-date-p file)
- (vc-checkout file nil t)
- (if (eq (vc-checkout-model backend (list file)) 'locking)
- (if (eq (vc-state file) 'edited)
- (error "%s"
- (substitute-command-keys
- "File is locked--type \\[vc-revert] to discard changes"))
- (error "Unexpected file state (%s) -- type %s"
- (vc-state file)
- (substitute-command-keys
- "\\[vc-next-action] to correct")))
- (vc-maybe-resolve-conflicts
- file (vc-call-backend backend 'merge-news file)))))))
+ (cond
+ ;; If a pull operation is defined, use it.
+ ((vc-find-backend-function backend 'pull)
+ (vc-call-backend backend 'pull arg))
+ ;; If VCS has `merge-news' functionality (CVS and SVN), use it.
+ ((vc-find-backend-function backend 'merge-news)
+ (save-some-buffers ; save buffers visiting files
+ nil (lambda ()
+ (and (buffer-modified-p)
+ (let ((file (buffer-file-name)))
+ (and file (member file files))))))
+ (dolist (file files)
+ (if (vc-up-to-date-p file)
+ (vc-checkout file nil t)
+ (vc-maybe-resolve-conflicts
+ file (vc-call-backend backend 'merge-news file)))))
+ ;; For a locking VCS, check out each file.
+ ((eq (vc-checkout-model backend files) 'locking)
+ (dolist (file files)
+ (if (vc-up-to-date-p file)
+ (vc-checkout file nil t))))
+ (t
+ (error "VC update is unsupported for `%s'" backend)))))
+
+;;;###autoload
+(defalias 'vc-update 'vc-pull)
(defun vc-version-backup-file (file &optional rev)
"Return name of backup file for revision REV of FILE.
(provide 'vc)
-;; arch-tag: ca82c1de-3091-4e26-af92-460abc6213a6
;;; vc.el ends here