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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: 4.0
;; $Id: vc-hooks.el,v 1.5 1992/10/20 18:43:33 rms Exp rms $
;; 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.")
;; Tell Emacs about this new kind of minor mode
(if (not (assoc 'vc-mode-string minor-mode-alist))
(setq minor-mode-alist (cons '(vc-mode-string vc-mode-string)
minor-mode-alist)))
(make-variable-buffer-local 'vc-mode-string)
;; 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.
(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-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)
(vc-file-setprop file 'vc-backend (cdr (vc-registered file))))))
(defun vc-toggle-read-only ()
"If the file in the current buffer is under version control, perform the
logical next version-control action; otherwise, just toggle the buffer's
read-only flag."
(interactive)
(if (vc-backend-deduce (buffer-file-name))
(vc-next-action nil)
(toggle-read-only)))
(defun vc-mode-line (file &optional label)
"Set `vc-mode-string' 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
(progn
(if (null (current-local-map))
(use-local-map (make-sparse-keymap)))
(define-key (current-local-map) "\C-x\C-q" 'vc-toggle-read-only)
(setq vc-mode-string
(concat " " (or label (symbol-name vc-type))))))
;; force update of mode line
(set-buffer-modified-p (buffer-modified-p))
vc-type))
;;; install a call to the above as a find-file hook
(defun vc-find-file-hook ()
(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 it may have
;;; to coexist with a lot of different major modes.
(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
|
