;;; desktop.el --- save partial status of Emacs when killed
-;; Copyright (C) 1993, 1994, 1995, 1997 Free Software Foundation, Inc.
+;; Copyright (C) 1993, 1994, 1995, 1997, 2000, 2001
+;; Free Software Foundation, Inc.
;; Author: Morten Welinder <terra@diku.dk>
;; Keywords: convenience
;; (desktop-load-default)
;; (desktop-read)
;;
-;; Between the second and the third line you may wish to add something that
-;; updates the variables `desktop-globals-to-save' and/or
-;; `desktop-locals-to-save'. If for instance you want to save the local
-;; variable `foobar' for every buffer in which it is local, you could add
-;; the line
+;; Between these two lines you may wish to add something that updates the
+;; variables `desktop-globals-to-save' and/or `desktop-locals-to-save'. If
+;; for instance you want to save the local variable `foobar' for every buffer
+;; in which it is local, you could add the line
;;
;; (setq desktop-locals-to-save (cons 'foobar desktop-locals-to-save))
;;
;; (desktop-truncate regexp-search-ring 3)))
;;
;; which will make sure that no more than three search items are saved. You
-;; must place this line *after* the (load "desktop") line. See also the
-;; variable desktop-save-hook.
+;; must place this line *after* the `(desktop-load-default)' line. See also
+;; the variable `desktop-save-hook'.
;; Start Emacs in the root directory of your "project". The desktop saver
;; is inactive by default. You activate it by M-x desktop-save RET. When
;; act as a default desktop when you start Emacs from a directory that
;; doesn't have its own. I never do this, but you may want to.
+;; Some words on minor modes: Most minor modes are controlled by
+;; buffer-local variables, which have a standard save / restore
+;; mechanism. To handle all minor modes, we take the following
+;; approach: (1) check whether the variable name from
+;; `minor-mode-alist' is also a function; and (2) use translation
+;; table `desktop-minor-mode-table' in the case where the two names
+;; are not the same.
+
;; By the way: don't use desktop.el to customize Emacs -- the file .emacs
;; in your home directory is used for that. Saving global default values
;; for buffers is an example of misuse.
:type 'regexp
:group 'desktop)
+(defcustom desktop-buffer-modes-to-save
+ '(Info-mode rmail-mode)
+ "If a buffer is of one of these major modes, save the buffer name.
+It is up to the functions in `desktop-buffer-handlers' to decide
+whether the buffer should be recreated or not, and how."
+ :type '(repeat symbol)
+ :group 'desktop)
+
+(defcustom desktop-modes-not-to-save nil
+ "List of major modes whose buffers should not be saved."
+ :type '(repeat symbol)
+ :group 'desktop)
+
(defcustom desktop-buffer-major-mode nil
"When desktop creates a buffer, this holds the desired Major mode."
:type 'symbol
"When desktop creates a buffer, this holds a list of misc info.
It is used by the `desktop-buffer-handlers' functions.")
+(defcustom desktop-buffer-misc-functions
+ '(desktop-buffer-info-misc-data
+ desktop-buffer-dired-misc-data)
+ "*Functions used to determine auxiliary information for a buffer.
+These functions are called in order, with no arguments. If a function
+returns non-nil, its value is saved along with the desktop buffer for
+which it was called; no further functions will be called.
+
+Later, when desktop.el restores the buffers it has saved, each of the
+`desktop-buffer-handlers' functions will have access to a buffer local
+variable, named `desktop-buffer-misc', whose value is what the
+\"misc\" function returned previously."
+ :type '(repeat function)
+ :group 'desktop)
+
(defcustom desktop-buffer-handlers
'(desktop-buffer-dired
desktop-buffer-rmail
variables `desktop-buffer-major-mode', `desktop-buffer-file-name',
`desktop-buffer-name'.
If one function returns non-nil, no further functions are called.
-If the function returns t then the buffer is considered created."
+If the function returns a buffer, then the saved mode settings
+and variable values for that buffer are copied into it."
:type '(repeat function)
:group 'desktop)
+(put 'desktop-buffer-handlers 'risky-local-variable t)
+
(defvar desktop-create-buffer-form "(desktop-create-buffer 205"
"Opening of form for creation of new buffers.")
:type 'hook
:group 'desktop)
+(defcustom desktop-minor-mode-table
+ '((auto-fill-function auto-fill-mode)
+ (vc-mode nil))
+ "Table mapping minor mode variables to minor mode functions.
+Each entry has the form (NAME RESTORE-FUNCTION).
+NAME is the name of the buffer-local variable indicating that the minor
+mode is active. RESTORE-FUNCTION is the function to activate the minor mode.
+called. RESTORE-FUNCTION nil means don't try to restore the minor mode.
+Only minor modes for which the name of the buffer-local variable
+and the name of the minor mode function are different have to added to
+this table."
+ :type 'sexp
+ :group 'desktop)
+
;; ----------------------------------------------------------------------------
(defvar desktop-dirname nil
"The directory in which the current desktop file resides.")
(if (and (integerp size)
(> size 0)
(listp (eval var)))
- (desktop-truncate (eval var) size))
+ (desktop-truncate (eval var) size))
(insert "(setq "
(symbol-name var)
" "
FILENAME is the visited file name, BUFNAME is the buffer name, and
MODE is the major mode."
(let ((case-fold-search nil))
- (or (and filename
- (not (string-match desktop-buffers-not-to-save bufname))
- (not (string-match desktop-files-not-to-save filename)))
- (and (eq mode 'dired-mode)
- (save-excursion
- (set-buffer (get-buffer bufname))
- (not (string-match desktop-files-not-to-save
- default-directory))))
- (and (null filename)
- (memq mode '(Info-mode rmail-mode))))))
+ (and (not (string-match desktop-buffers-not-to-save bufname))
+ (not (memq mode desktop-modes-not-to-save))
+ (or (and filename
+ (not (string-match desktop-files-not-to-save filename)))
+ (and (eq mode 'dired-mode)
+ (save-excursion
+ (set-buffer (get-buffer bufname))
+ (not (string-match desktop-files-not-to-save
+ default-directory))))
+ (and (null filename)
+ (memq mode desktop-buffer-modes-to-save))))))
;; ----------------------------------------------------------------------------
+(defcustom desktop-relative-file-names nil
+ "*Store relative file names in the desktop file."
+ :type 'boolean
+ :group 'desktop)
+
(defun desktop-save (dirname)
"Save the Desktop file. Parameter DIRNAME specifies where to save desktop."
(interactive "DDirectory to save desktop file in: ")
(run-hooks 'desktop-save-hook)
(save-excursion
- (let ((filename (expand-file-name
- (concat dirname desktop-basefilename)))
+ (let ((filename (expand-file-name desktop-basefilename dirname))
(info (nreverse
(mapcar
- (function (lambda (b)
- (set-buffer b)
- (list
- (buffer-file-name)
- (buffer-name)
- major-mode
- (list ; list explaining minor modes
- (not (null auto-fill-function)))
- (point)
- (list (mark t) mark-active)
- buffer-read-only
- (cond ((eq major-mode 'Info-mode)
- (list Info-current-file
- Info-current-node))
- ((eq major-mode 'dired-mode)
- (cons
- (expand-file-name dired-directory)
- (cdr
- (nreverse
- (mapcar
- (function car)
- dired-subdir-alist))))))
- (let ((locals desktop-locals-to-save)
- (loclist (buffer-local-variables))
- (ll))
- (while locals
- (let ((here (assq (car locals) loclist)))
- (if here
- (setq ll (cons here ll))
- (if (member (car locals) loclist)
- (setq ll (cons (car locals) ll)))))
- (setq locals (cdr locals)))
- ll)
- )))
+ (function
+ (lambda (b)
+ (set-buffer b)
+ (list
+ (let ((bn (buffer-file-name)))
+ (if bn
+ (if desktop-relative-file-names
+ (file-relative-name bn dirname)
+ bn)))
+ (buffer-name)
+ major-mode
+ ;; minor modes
+ (let (ret)
+ (mapcar
+ #'(lambda (mim)
+ (and (boundp mim)
+ (symbol-value mim)
+ (setq ret
+ (cons (let ((special (assq mim desktop-minor-mode-table)))
+ (if special
+ (cadr special)
+ mim))
+ ret))))
+ (mapcar #'car minor-mode-alist))
+ ret)
+ (point)
+ (list (mark t) mark-active)
+ buffer-read-only
+ (run-hook-with-args-until-success
+ 'desktop-buffer-misc-functions)
+ (let ((locals desktop-locals-to-save)
+ (loclist (buffer-local-variables))
+ (ll))
+ (while locals
+ (let ((here (assq (car locals) loclist)))
+ (if here
+ (setq ll (cons here ll))
+ (if (member (car locals) loclist)
+ (setq ll (cons (car locals) ll)))))
+ (setq locals (cdr locals)))
+ ll)
+ )))
(buffer-list))))
(buf (get-buffer-create "*desktop*")))
(set-buffer buf)
(erase-buffer)
- (insert desktop-header
+ (insert ";; -*- coding: emacs-mule; -*-\n"
+ desktop-header
";; Created " (current-time-string) "\n"
";; Emacs version " emacs-version "\n\n"
";; Global section:\n")
(insert "\n;; Buffer section:\n")
(mapcar
(function (lambda (l)
- (if (apply 'desktop-save-buffer-p l)
- (progn
- (insert desktop-create-buffer-form)
- (mapcar
- (function (lambda (e)
- (insert "\n "
- (desktop-value-to-string e))))
- l)
- (insert ")\n\n")))))
+ (if (apply 'desktop-save-buffer-p l)
+ (progn
+ (insert desktop-create-buffer-form)
+ (mapcar
+ (function (lambda (e)
+ (insert "\n "
+ (desktop-value-to-string e))))
+ l)
+ (insert ")\n\n")))))
info)
(setq default-directory dirname)
(if (file-exists-p filename) (delete-file filename))
- (write-region (point-min) (point-max) filename nil 'nomessage)))
+ (let ((coding-system-for-write 'emacs-mule))
+ (write-region (point-min) (point-max) filename nil 'nomessage))))
(setq desktop-dirname dirname))
;; ----------------------------------------------------------------------------
(defun desktop-remove ()
(setq dirs (cdr dirs)))
(setq desktop-dirname (and dirs (expand-file-name (car dirs))))
(if desktop-dirname
- (progn
+ (let ((desktop-last-buffer nil))
+ ;; `load-with-code-conversion' calls `eval-buffer' which
+ ;; contains a `save-excursion', so we end up with the same
+ ;; buffer before and after the load. This is a problem
+ ;; when the desktop is read initially when Emacs starts up
+ ;; because, if we still are in *scratch* after running
+ ;; `after-init-hook', the splash screen will be displayed.
(load (expand-file-name desktop-basefilename desktop-dirname)
t t t)
+ (when desktop-last-buffer
+ (switch-to-buffer desktop-last-buffer))
(run-hooks 'desktop-delay-hook)
(setq desktop-delay-hook nil)
(message "Desktop loaded."))
;; ----------------------------------------------------------------------------
;; Note: the following functions use the dynamic variable binding in Lisp.
;;
+(defun desktop-buffer-info-misc-data ()
+ (if (eq major-mode 'Info-mode)
+ (list Info-current-file
+ Info-current-node)))
+
+(defun desktop-buffer-dired-misc-data ()
+ (if (eq major-mode 'dired-mode)
+ (cons
+ (expand-file-name dired-directory)
+ (cdr
+ (nreverse
+ (mapcar
+ (function car)
+ dired-subdir-alist))))))
+
(defun desktop-buffer-info () "Load an info file."
(if (eq 'Info-mode desktop-buffer-major-mode)
(progn
- (require 'info)
- (Info-find-node (nth 0 desktop-buffer-misc) (nth 1 desktop-buffer-misc))
- (current-buffer))))
+ (let ((first (nth 0 desktop-buffer-misc))
+ (second (nth 1 desktop-buffer-misc)))
+ (when (and first second)
+ (require 'info)
+ (Info-find-node first second)
+ (current-buffer))))))
;; ----------------------------------------------------------------------------
(defun desktop-buffer-rmail () "Load an RMAIL file."
(if (eq 'rmail-mode desktop-buffer-major-mode)
(y-or-n-p (format
"File \"%s\" no longer exists. Re-create? "
desktop-buffer-file-name))))
- (progn (find-file desktop-buffer-file-name) (current-buffer))
+ (let ((buf (find-file-noselect desktop-buffer-file-name)))
+ (condition-case nil
+ (switch-to-buffer buf)
+ (error (pop-to-buffer buf)))
+ buf)
'ignored)))
;; ----------------------------------------------------------------------------
;; Create a buffer, load its file, set is mode, ...; called from Desktop file
;; only.
+
+(defvar desktop-last-buffer nil
+ "Last buffer read. Dynamically bound in `desktop-read'.")
+
(defun desktop-create-buffer (ver desktop-buffer-file-name desktop-buffer-name
desktop-buffer-major-mode
- mim pt mk ro desktop-buffer-misc &optional locals)
+ mim pt mk ro desktop-buffer-misc
+ &optional locals)
(let ((hlist desktop-buffer-handlers)
(result)
(handler))
(setq result (funcall handler))
(setq hlist (cdr hlist)))
(when (bufferp result)
+ (setq desktop-last-buffer result)
(set-buffer result)
(if (not (equal (buffer-name) desktop-buffer-name))
(rename-buffer desktop-buffer-name))
- (auto-fill-mode (if (nth 0 mim) 1 0))
+ ;; minor modes
+ (cond ((equal '(t) mim) (auto-fill-mode 1)) ; backwards compatible
+ ((equal '(nil) mim) (auto-fill-mode 0))
+ (t (mapcar #'(lambda (minor-mode)
+ (when (functionp minor-mode)
+ (funcall minor-mode 1)))
+ mim)))
(goto-char pt)
(if (consp mk)
(progn
(provide 'desktop)
-;; desktop.el ends here.
+;;; desktop.el ends here