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- ;;; vc-hooks.el --- resident support for version-control
-
- ;; Copyright (C) 1992 Free Software Foundation, Inc.
-
- ;; Author: Eric S. Raymond <esr@snark.thyrsus.com>
- ;; Version: 5.3
-
- ;; 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 2, 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; see the file COPYING. If not, write to
- ;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
-
- ;;; Commentary:
-
- ;; See the commentary of vc.el.
-
- ;;; Code:
-
- (defvar vc-master-templates
- '(("%sRCS/%s,v" . RCS) ("%s%s,v" . RCS) ("%sRCS/%s" . RCS)
- ("%sSCCS/s.%s" . SCCS) ("%ss.%s". SCCS))
- "*Where to look for version-control master files.
- The first pair corresponding to a given back end is used as a template
- when creating new masters.")
-
- (defvar vc-make-backup-files nil
- "*If non-nil, backups of registered files are made according to
- the make-backup-files variable. Otherwise, prevents backups being made.")
-
- (defvar vc-rcs-status t
- "*If non-nil, revision and locks on RCS working file displayed in modeline.
- Otherwise, not displayed.")
-
- ;; Tell Emacs about this new kind of minor mode
- (if (not (assoc 'vc-mode minor-mode-alist))
- (setq minor-mode-alist (cons '(vc-mode vc-mode)
- minor-mode-alist)))
-
- (make-variable-buffer-local 'vc-mode)
- (put 'vc-mode 'permanent-local t)
-
- ;; We need a notion of per-file properties because the version
- ;; control state of a file is expensive to derive --- we don't
- ;; want to recompute it even on every find.
-
- (defmacro vc-error-occurred (&rest body)
- (list 'condition-case nil (cons 'progn (append body '(nil))) '(error t)))
-
- (defvar vc-file-prop-obarray [0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0]
- "Obarray for per-file properties.")
-
- (defun vc-file-setprop (file property value)
- ;; set per-file property
- (put (intern file vc-file-prop-obarray) property value))
-
- (defun vc-file-getprop (file property)
- ;; get per-file property
- (get (intern file vc-file-prop-obarray) property))
-
- ;;; actual version-control code starts here
-
- (defun vc-registered (file)
- (let (handler handlers)
- (if (boundp 'file-name-handler-alist)
- (save-match-data
- (setq handlers file-name-handler-alist)
- (while (and (consp handlers) (null handler))
- (if (and (consp (car handlers))
- (stringp (car (car handlers)))
- (string-match (car (car handlers)) file))
- (setq handler (cdr (car handlers))))
- (setq handlers (cdr handlers)))))
- (if handler
- (funcall handler 'vc-registered file)
- ;; Search for a master corresponding to the given file
- (let ((dirname (or (file-name-directory file) ""))
- (basename (file-name-nondirectory file)))
- (catch 'found
- (mapcar
- (function (lambda (s)
- (let ((trial (format (car s) dirname basename)))
- (if (and (file-exists-p trial)
- ;; Make sure the file we found with name
- ;; TRIAL is not the source file itself.
- ;; That can happen with RCS-style names
- ;; if the file name is truncated
- ;; (e.g. to 14 chars). See if either
- ;; directory or attributes differ.
- (or (not (string= dirname
- (file-name-directory trial)))
- (not (equal
- (file-attributes file)
- (file-attributes trial)))))
- (throw 'found (cons trial (cdr s)))))))
- vc-master-templates)
- nil)))))
-
- (defun vc-name (file)
- "Return the master name of a file, nil if it is not registered."
- (or (vc-file-getprop file 'vc-name)
- (let ((name-and-type (vc-registered file)))
- (if name-and-type
- (progn
- (vc-file-setprop file 'vc-backend (cdr name-and-type))
- (vc-file-setprop file 'vc-name (car name-and-type)))))))
-
- (defun vc-backend-deduce (file)
- "Return the version-control type of a file, nil if it is not registered."
- (and file
- (or (vc-file-getprop file 'vc-backend)
- (let ((name-and-type (vc-registered file)))
- (if name-and-type
- (progn
- (vc-file-setprop file 'vc-name (car name-and-type))
- (vc-file-setprop file 'vc-backend (cdr name-and-type))))))))
-
- (defun vc-toggle-read-only ()
- "Change read-only status of current buffer, perhaps via version control.
- If the buffer is visiting a file registered with version control,
- then check the file in or out. Otherwise, just change the read-only flag
- of the buffer."
- (interactive)
- (if (vc-backend-deduce (buffer-file-name))
- (vc-next-action nil)
- (toggle-read-only)))
- (define-key global-map "\C-x\C-q" 'vc-toggle-read-only)
-
- (defun vc-mode-line (file &optional label)
- "Set `vc-mode' to display type of version control for FILE.
- The value is set in the current buffer, which should be the buffer
- visiting FILE."
- (interactive (list buffer-file-name nil))
- (let ((vc-type (vc-backend-deduce file)))
- (if vc-type
- (setq vc-mode
- (concat " " (or label (symbol-name vc-type))
- (if (and vc-rcs-status (eq vc-type 'RCS))
- (vc-rcs-status file)))))
- ;; force update of mode line
- (set-buffer-modified-p (buffer-modified-p))
- vc-type))
-
- (defun vc-rcs-status (file)
- ;; Return string " [LOCKER:REV]" if FILE under RCS control, otherwise nil,
- ;; for placement in modeline by `vc-mode-line'.
-
- ;; If FILE is not locked then return just "". If the FILE is locked
- ;; then return *all* the locks currently set, in a single string of the
- ;; form " LOCKER1:REV1 LOCKER2:REV2 ...".
-
- ;; Algorithm:
-
- ;; 1. Check for master file corresponding to FILE being visited.
- ;;
- ;; 2. Insert the first few characters of the master file into a work
- ;; buffer.
- ;;
- ;; 3. Search work buffer for line starting with "date" indicating enough
- ;; of header was included; if not found, then keep inserting characters
- ;; until "date" is located.
- ;;
- ;; 4. Search work buffer for line starting with "locks", extract
- ;; all the locks currently enabled, and remove control characters
- ;; separating them, like newlines; the string " user1:revision1
- ;; user2:revision2 ..." is returned.
-
- ;; Limitations:
-
- ;; The output doesn't show which version you are actually looking at.
- ;; The modeline can get quite cluttered when there are multiple locks.
-
- (let ((master (vc-name file))
- found status)
-
- ;; If master file exists, then parse its contents, otherwise we return the
- ;; nil value of this if form.
- (if master
- (save-excursion
-
- ;; Create work buffer.
- (set-buffer (get-buffer-create "*vc-rcs-status*"))
- (setq buffer-read-only nil
- default-directory (file-name-directory master))
- (erase-buffer)
-
- ;; Check if we have enough of the header.
- ;; If not, then keep including more.
- (while
- (not (or found
- (let ((s (buffer-size)))
- (goto-char (1+ s))
- (zerop (car (cdr (insert-file-contents
- master nil s (+ s 8192))))))))
- (beginning-of-line)
- (setq found (re-search-forward "^locks\\([^;]*\\);" nil t)))
-
- (if found
- ;; Clean control characters from text.
- (let ((status
- (save-restriction
- (narrow-to-region (match-beginning 1) (match-end 1))
- (goto-char (point-min))
- (while (re-search-forward "[ \b\t\n\v\f\r]+" nil t)
- (replace-match " " t t))
- (buffer-string))))
- ;; Clean work buffer.
- (erase-buffer)
- (set-buffer-modified-p nil)
- status))))))
-
- ;;; install a call to the above as a find-file hook
- (defun vc-find-file-hook ()
- ;; Recompute whether file is version controlled,
- ;; if user has killed the buffer and revisited.
- (if buffer-file-name
- (vc-file-setprop buffer-file-name 'vc-backend nil))
- (if (and (vc-mode-line buffer-file-name) (not vc-make-backup-files))
- (progn
- (make-local-variable 'make-backup-files)
- (setq make-backup-files nil))))
-
- (or (memq 'vc-find-file-hook find-file-hooks)
- (setq find-file-hooks
- (cons 'vc-find-file-hook find-file-hooks)))
-
- ;;; more hooks, this time for file-not-found
- (defun vc-file-not-found-hook ()
- "When file is not found, try to check it out from RCS or SCCS.
- Returns t if checkout was successful, nil otherwise."
- (if (vc-backend-deduce buffer-file-name)
- (progn
- (require 'vc)
- (not (vc-error-occurred (vc-checkout buffer-file-name))))))
-
- (or (memq 'vc-file-not-found-hook find-file-not-found-hooks)
- (setq find-file-not-found-hooks
- (cons 'vc-file-not-found-hook find-file-not-found-hooks)))
-
- ;;; Now arrange for bindings and autoloading of the main package.
- ;;; Bindings for this have to go in the global map, as we'll often
- ;;; want to call them from random buffers.
-
- (setq vc-prefix-map (lookup-key global-map "\C-xv"))
- (if (not (keymapp vc-prefix-map))
- (progn
- (setq vc-prefix-map (make-sparse-keymap))
- (define-key global-map "\C-xv" vc-prefix-map)
- (define-key vc-prefix-map "a" 'vc-update-change-log)
- (define-key vc-prefix-map "c" 'vc-cancel-version)
- (define-key vc-prefix-map "d" 'vc-directory)
- (define-key vc-prefix-map "h" 'vc-insert-headers)
- (define-key vc-prefix-map "i" 'vc-register)
- (define-key vc-prefix-map "l" 'vc-print-log)
- (define-key vc-prefix-map "r" 'vc-retrieve-snapshot)
- (define-key vc-prefix-map "s" 'vc-create-snapshot)
- (define-key vc-prefix-map "u" 'vc-revert-buffer)
- (define-key vc-prefix-map "v" 'vc-next-action)
- (define-key vc-prefix-map "=" 'vc-diff)
- ))
-
- (provide 'vc-hooks)
-
- ;;; vc-hooks.el ends here
-