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;;; vc-hooks.el --- resident support for version-control
;; Copyright (C) 1992, 1993 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)))
(setq vc-mode
(and vc-type
(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 for placement in modeline by `vc-mode-line'.
;; If FILE is not registered under RCS, return nil.
;; If FILE is registered but not locked, return " REV" if there is a head
;; revision and " @@" otherwise.
;; If FILE is locked then return all locks in a string of the
;; form " LOCKER1:REV1 LOCKER2:REV2 ...", where "LOCKERi:" is empty if you
;; are the locker, and otherwise is the name of the locker followed by ":".
;; 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 "locks...;" phrase; if not found, then
;; keep inserting more characters until the phrase is found.
;;
;; 4. Extract the locks, 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.
;; The head revision is probably not what you want if you've used `rcs -b'.
(let ((master (vc-name file))
found)
;; 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 and self-locks from text.
(let* ((lock-pattern
(concat "[ \b\t\n\v\f\r]+\\("
(regexp-quote (user-login-name))
":\\)?"))
(locks
(save-restriction
(narrow-to-region (match-beginning 1) (match-end 1))
(goto-char (point-min))
(while (re-search-forward lock-pattern nil t)
(replace-match (if (eobp) "" "-") t t))
(buffer-string)))
(status
(if (not (string-equal locks ""))
locks
(goto-char (point-min))
(if (looking-at "head[ \b\t\n\v\f\r]+\\([.0-9]+\\)")
(concat "-" (buffer-substring (match-beginning 1)
(match-end 1)))
" @@"))))
;; 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))))
(add-hook 'find-file-hooks 'vc-find-file-hook)
;;; 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))))))
(add-hook 'find-file-not-found-hooks 'vc-file-not-found-hook)
;;; 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)
(define-key vc-prefix-map "~" 'vc-version-other-window)
))
(provide 'vc-hooks)
;;; vc-hooks.el ends here
|
