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;;; vc-hooks.el --- resident support for version-control
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;; Copyright (C) 1992, 1993, 1994 Free Software Foundation, Inc.
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;; Author: Eric S. Raymond <esr@snark.thyrsus.com>
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;; Version: 5.3
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;; 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
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  "*If non-nil, backups of registered files are made as with other files.
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If nil (the default), files covered by version control don't get backups.")
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(defvar vc-display-status t
  "*If non-nil, display revision number and lock status in modeline.
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Otherwise, not displayed.")

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;; Tell Emacs about this new kind of minor mode
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(if (not (assoc 'vc-mode minor-mode-alist))
    (setq minor-mode-alist (cons '(vc-mode vc-mode)
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				 minor-mode-alist)))

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(make-variable-buffer-local 'vc-mode)
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(put 'vc-mode 'permanent-local t)
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;; 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.

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(defmacro vc-error-occurred (&rest body)
  (list 'condition-case nil (cons 'progn (append body '(nil))) '(error t)))

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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]
  "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)
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  (let (handler handlers)
    (if (boundp 'file-name-handler-alist)
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	(setq handler (find-file-name-handler file 'vc-registered)))
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    (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)))))
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(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)))))))

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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
       (or (vc-file-getprop file 'vc-backend)
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	   (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))))))))
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(defun vc-toggle-read-only ()
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  "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."
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  (interactive)
  (if (vc-backend-deduce (buffer-file-name))
      (vc-next-action nil)
    (toggle-read-only)))
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(define-key global-map "\C-x\C-q" 'vc-toggle-read-only)
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(defun vc-mode-line (file &optional label)
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  "Set `vc-mode' 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.  Second optional arg LABEL is put in place of version
control system name."
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  (interactive (list buffer-file-name nil))
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  (if file
      (let ((vc-type (vc-backend-deduce file)))
	(setq vc-mode
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	      (if vc-type
		  (concat " " (or label (symbol-name vc-type))
			  (if vc-display-status
			      (vc-status file vc-type)))))
	;; Even root shouldn't modify a registered file without
	;; locking it first.
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	(and vc-type
	     (not buffer-read-only)
	     (zerop (user-uid))
	     (require 'vc)
	     (not (string-equal (user-login-name) (vc-locking-user file)))
	     (setq buffer-read-only t))
	(and (null vc-type)
	     (file-symlink-p file)
	     (let ((link-type (vc-backend-deduce (file-symlink-p file))))
	       (if link-type
		   (message "Warning: symbolic link to %s-controlled source file"
			    link-type))))
	(force-mode-line-update)
	;;(set-buffer-modified-p (buffer-modified-p))  ;;use this if Emacs 18
	vc-type)))
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(defun vc-status (file vc-type)
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  ;; Return string for placement in modeline by `vc-mode-line'.
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  ;; If FILE is not registered, return nil.
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  ;; 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
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  ;; form " LOCKER1:REV1 LOCKER2:REV2 ...", where "LOCKERi:" is empty if you
  ;; are the locker, and otherwise is the name of the locker followed by ":".
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  ;; Algorithm: 

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  ;; Check for master file corresponding to FILE being visited.
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  ;; 
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  ;; RCS: Insert the first few characters of the master file into a
  ;; work buffer.  Search work buffer for "locks...;" phrase; if not
  ;; found, then keep inserting more characters until the phrase is
  ;; found.  Extract the locks, and remove control characters
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  ;; separating them, like newlines; the string " user1:revision1
  ;; user2:revision2 ..." is returned.
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  ;;
  ;; SCCS: Check if the p-file exists.  If it does, read it and
  ;; extract the locks, giving them the right format.  Else use prs to
  ;; find the revision number.
  
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  ;; Limitations:

  ;; The output doesn't show which version you are actually looking at.
  ;; The modeline can get quite cluttered when there are multiple locks.
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  ;; The head revision is probably not what you want if you've used `rcs -b'.
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  (let ((master (vc-name file))
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	found
	status)
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    ;; If master file exists, then parse its contents, otherwise we
    ;; return the nil value of this if form.
    (if (and master vc-type)
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        (save-excursion

          ;; Create work buffer.
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          (set-buffer (get-buffer-create " *vc-status*"))
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          (setq buffer-read-only nil
                default-directory (file-name-directory master))
          (erase-buffer)

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	  ;; Set the `status' var to the return value.
	  (cond

	   ;; RCS code.
	   ((eq vc-type 'RCS)
	    ;; 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))))
		  (setq 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)))
			    " @@"))))))

	   ;; SCCS code.
	   ((eq vc-type 'SCCS)
	    ;; Build the name of the p-file and put it in the work buffer.
	    (insert master)
	    (search-backward "/s.")
	    (delete-char 2)
	    (insert "/p")
	    (if (not (file-exists-p (buffer-string)))
		;; No lock.
		(let ((exec-path (if vc-path (append exec-path vc-path)
				   exec-path)))
		  (erase-buffer)
		  (insert "-")
		  (if (zerop (call-process "prs" nil t nil "-d:I:" master))
		      (setq status (buffer-substring 1 (1- (point-max))))))
	      ;; Locks exist.
	      (insert-file-contents (buffer-string) nil nil nil t)
	      (while (looking-at "[^ ]+ \\([^ ]+\\) \\([^ ]+\\).*\n")
		(replace-match " \\2:\\1"))
	      (setq status (buffer-string))
	      (aset status 0 ?:))))

	  ;; Clean work buffer.
	  (erase-buffer)
	  (set-buffer-modified-p nil)
	  status))))
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;;; install a call to the above as a find-file hook
(defun vc-find-file-hook ()
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  ;; Recompute whether file is version controlled,
  ;; if user has killed the buffer and revisited.
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  (if buffer-file-name
      (vc-file-setprop buffer-file-name 'vc-backend nil))
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  (if (and (vc-mode-line buffer-file-name) (not vc-make-backup-files))
      (progn
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	;; Use this variable, not make-backup-files,
	;; because this is for things that depend on the file name.
	(make-local-variable 'backup-inhibited)
	(setq backup-inhibited t))))
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(add-hook 'find-file-hooks 'vc-find-file-hook)
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;;; 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)
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      (save-excursion
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	(require 'vc)
	(not (vc-error-occurred (vc-checkout buffer-file-name))))))

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(add-hook 'find-file-not-found-hooks 'vc-file-not-found-hook)
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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 we'll often
;;; want to call them from random buffers.
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(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)
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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)
      (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)
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      (define-key vc-prefix-map "=" 'vc-diff)
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      (define-key vc-prefix-map "~" 'vc-version-other-window)))

;;;(define-key vc-menu-map [show-files]
;;;  '("Show Files under VC" . (vc-directory t)))
(define-key vc-menu-map [vc-directory] '("Show Locked Files" . vc-directory))
(define-key vc-menu-map [separator1] '("----"))
(define-key vc-menu-map [vc-rename-file] '("Rename File" . vc-rename-file))
(define-key vc-menu-map [vc-version-other-window]
  '("Show Other Version" . vc-version-other-window))
(define-key vc-menu-map [vc-diff] '("Compare with Last Version" . vc-diff))
(define-key vc-menu-map [vc-update-change-log]
  '("Update ChangeLog" . vc-update-change-log))
(define-key vc-menu-map [vc-print-log] '("Show History" . vc-print-log))
(define-key vc-menu-map [separator2] '("----"))
(define-key vc-menu-map [undo] '("Undo Last Check-In" . vc-cancel-version))
(define-key vc-menu-map [vc-revert-buffer]
  '("Revert to Last Version" . vc-revert-buffer))
(define-key vc-menu-map [vc-insert-header]
  '("Insert Header" . vc-insert-headers))
(define-key vc-menu-map [vc-menu-check-in] '("Check In" . vc-next-action))
(define-key vc-menu-map [vc-check-out] '("Check Out" . vc-toggle-read-only))
(define-key vc-menu-map [vc-register] '("Register" . vc-register))

(put 'vc-rename-file 'menu-enable 'vc-mode)
(put 'vc-version-other-window 'menu-enable 'vc-mode)
(put 'vc-diff 'menu-enable 'vc-mode)
(put 'vc-update-change-log 'menu-enable '(eq (vc-backend-deduce (buffer-file-name)) 'RCS))
(put 'vc-print-log 'menu-enable 'vc-mode)
(put 'vc-cancel-version 'menu-enable 'vc-mode)
(put 'vc-revert-buffer 'menu-enable 'vc-mode)
(put 'vc-insert-headers 'menu-enable 'vc-mode)
(put 'vc-next-action 'menu-enable '(and vc-mode (not buffer-read-only)))
(put 'vc-toggle-read-only 'menu-enable '(and vc-mode buffer-read-only))
(put 'vc-register 'menu-enable '(not vc-mode))
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(provide 'vc-hooks)

;;; vc-hooks.el ends here