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184 lines
6.5 KiB
EmacsLisp
184 lines
6.5 KiB
EmacsLisp
;;; vc-hooks.el -- resident support for version-control
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;; Copyright (C) 1992 Free Software Foundation, Inc.
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;; Author: Eric S. Raymond <esr@snark.thyrsus.com>
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;; Version: 4.0
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;; $Id: vc-hooks.el,v 1.5 1992/10/20 18:43:33 rms Exp rms $
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;; This file is part of GNU Emacs.
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;; GNU Emacs is free software; you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation; either version 2, or (at your option)
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;; any later version.
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;; GNU Emacs is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;; You should have received a copy of the GNU General Public License
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;; along with GNU Emacs; see the file COPYING. If not, write to
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;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
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;;; Commentary:
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;; See the commentary of vc.el.
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;;; Code:
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(defvar vc-master-templates
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'(("%sRCS/%s,v" . RCS) ("%s%s,v" . RCS) ("%sRCS/%s" . RCS)
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("%sSCCS/s.%s" . SCCS) ("%ss.%s". SCCS))
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"*Where to look for version-control master files.
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The first pair corresponding to a given back end is used as a template
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when creating new masters.")
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(defvar vc-make-backup-files nil
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"*If non-nil, backups of registered files are made according to
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the make-backup-files variable. Otherwise, prevents backups being made.")
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;; Tell Emacs about this new kind of minor mode
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(if (not (assoc 'vc-mode-string minor-mode-alist))
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(setq minor-mode-alist (cons '(vc-mode-string vc-mode-string)
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minor-mode-alist)))
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(make-variable-buffer-local 'vc-mode-string)
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;; We need a notion of per-file properties because the version
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;; control state of a file is expensive to derive --- we don't
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;; want to recompute it even on every find.
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(defvar vc-file-prop-obarray [0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0]
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"Obarray for per-file properties.")
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(defun vc-file-setprop (file property value)
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;; set per-file property
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(put (intern file vc-file-prop-obarray) property value))
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(defun vc-file-getprop (file property)
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;; get per-file property
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(get (intern file vc-file-prop-obarray) property))
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;;; actual version-control code starts here
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(defun vc-registered (file)
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(let (handler handlers)
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(if (boundp 'file-name-handler-alist)
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(save-match-data
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(setq handlers file-name-handler-alist)
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(while (and (consp handlers) (null handler))
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(if (and (consp (car handlers))
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(stringp (car (car handlers)))
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(string-match (car (car handlers)) file))
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(setq handler (cdr (car handlers))))
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(setq handlers (cdr handlers)))))
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(if handler
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(funcall handler 'vc-registered file)
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;; Search for a master corresponding to the given file
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(let ((dirname (or (file-name-directory file) ""))
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(basename (file-name-nondirectory file)))
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(catch 'found
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(mapcar
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(function (lambda (s)
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(let ((trial (format (car s) dirname basename)))
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(if (and (file-exists-p trial)
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;; Make sure the file we found with name
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;; TRIAL is not the source file itself.
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;; That can happen with RCS-style names
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;; if the file name is truncated
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;; (e.g. to 14 chars). See if either
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;; directory or attributes differ.
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(or (not (string= dirname
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(file-name-directory trial)))
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(not (equal
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(file-attributes file)
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(file-attributes trial)))))
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(throw 'found (cons trial (cdr s)))))))
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vc-master-templates)
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nil)))))
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(defun vc-backend-deduce (file)
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"Return the version-control type of a file, nil if it is not registered"
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(and file
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(or (vc-file-getprop file 'vc-backend)
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(vc-file-setprop file 'vc-backend (cdr (vc-registered file))))))
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(defun vc-toggle-read-only ()
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"If the file in the current buffer is under version control, perform the
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logical next version-control action; otherwise, just toggle the buffer's
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read-only flag."
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(interactive)
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(if (vc-backend-deduce (buffer-file-name))
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(vc-next-action nil)
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(toggle-read-only)))
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(defun vc-mode-line (file &optional label)
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"Set `vc-mode-string' to display type of version control for FILE.
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The value is set in the current buffer, which should be the buffer
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visiting FILE."
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(interactive (list buffer-file-name nil))
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(let ((vc-type (vc-backend-deduce file)))
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(if vc-type
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(progn
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(if (null (current-local-map))
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(use-local-map (make-sparse-keymap)))
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(define-key (current-local-map) "\C-x\C-q" 'vc-toggle-read-only)
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(setq vc-mode-string
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(concat " " (or label (symbol-name vc-type))))))
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;; force update of mode line
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(set-buffer-modified-p (buffer-modified-p))
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vc-type))
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;;; install a call to the above as a find-file hook
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(defun vc-find-file-hook ()
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(if (and (vc-mode-line buffer-file-name) (not vc-make-backup-files))
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(progn
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(make-local-variable 'make-backup-files)
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(setq make-backup-files nil))))
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(or (memq 'vc-find-file-hook find-file-hooks)
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(setq find-file-hooks
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(cons 'vc-find-file-hook find-file-hooks)))
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;;; more hooks, this time for file-not-found
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(defun vc-file-not-found-hook ()
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"When file is not found, try to check it out from RCS or SCCS.
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Returns t if checkout was successful, nil otherwise."
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(if (vc-backend-deduce buffer-file-name)
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(progn
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(require 'vc)
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(not (vc-error-occurred (vc-checkout buffer-file-name))))))
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(or (memq 'vc-file-not-found-hook find-file-not-found-hooks)
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(setq find-file-not-found-hooks
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(cons 'vc-file-not-found-hook find-file-not-found-hooks)))
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;;; Now arrange for bindings and autoloading of the main package.
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;;; Bindings for this have to go in the global map, as it may have
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;;; to coexist with a lot of different major modes.
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(setq vc-prefix-map (lookup-key global-map "\C-xv"))
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(if (not (keymapp vc-prefix-map))
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(progn
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(setq vc-prefix-map (make-sparse-keymap))
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(define-key global-map "\C-xv" vc-prefix-map)
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(define-key vc-prefix-map "a" 'vc-update-change-log)
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(define-key vc-prefix-map "c" 'vc-cancel-version)
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(define-key vc-prefix-map "d" 'vc-directory)
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(define-key vc-prefix-map "h" 'vc-insert-headers)
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(define-key vc-prefix-map "i" 'vc-register)
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(define-key vc-prefix-map "l" 'vc-print-log)
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(define-key vc-prefix-map "r" 'vc-retrieve-snapshot)
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(define-key vc-prefix-map "s" 'vc-create-snapshot)
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(define-key vc-prefix-map "u" 'vc-revert-buffer)
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(define-key vc-prefix-map "v" 'vc-next-action)
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(define-key vc-prefix-map "=" 'vc-diff)
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))
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(provide 'vc-hooks)
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;;; vc-hooks.el ends here
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