edit-utils / desktop.el

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;;; desktop.el --- save partial status of Emacs when killed

;; Copyright (C) 1993, 1994, 1995 Free Software Foundation, Inc.

;; Author: Morten Welinder <terra@diku.dk>
;; Version: 2.09?  RMS has an obnoxious tendency to remove version
;; numbers from packages, and he did in this case.
;; Keywords: customization
;; Favourite-brand-of-beer: None, I hate beer.

;; This file is part of XEmacs.

;; XEmacs 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.

;; XEmacs 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 XEmacs; see the file COPYING.  If not, write to the Free
;; Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
;; 02111-1307, USA.

;;; Synched up with: FSF 19.34.

;;; Commentary:

;; Save the Desktop, i.e.,
;;	- some global variables
;; 	- the list of buffers with associated files.  For each buffer also
;;		- the major mode
;;		- the default directory
;;		- the point
;;		- the mark & mark-active
;;		- buffer-read-only
;;		- some local variables

;; To use this, first put these three lines in the bottom of your .emacs
;; file (the later the better):
;;
;;	(load "desktop")
;;	(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
;;
;;	(setq desktop-locals-to-save (cons 'foobar desktop-locals-to-save))
;;
;; To avoid saving excessive amounts of data you may also wish to add
;; something like the following
;;
;;	(add-hook 'kill-emacs-hook
;;		  '(lambda ()
;;		     (desktop-truncate search-ring 3)
;;		     (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.

;; 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
;; you exit the next time the above data will be saved.  This ensures that
;; all the files you were editing will be reloaded the next time you start
;; Emacs from the same directory and that points will be set where you
;; left them.  If you save a desktop file in your home directory it will
;; 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.

;; 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.

;; PLEASE NOTE: The kill ring can be saved as specified by the variable
;; `desktop-globals-to-save' (by default it isn't).  This may result in saving
;; things you did not mean to keep.  Use M-x desktop-clear RET.

;; Thanks to  hetrick@phys.uva.nl (Jim Hetrick)      for useful ideas.
;;            avk@rtsg.mot.com (Andrew V. Klein)     for a dired tip.
;;            chris@tecc.co.uk (Chris Boucher)       for a mark tip.
;;            f89-kam@nada.kth.se (Klas Mellbourn)   for a mh-e tip.
;;            kifer@sbkifer.cs.sunysb.edu (M. Kifer) for a bug hunt.
;;            treese@lcs.mit.edu (Win Treese)        for ange-ftp tips.
;;            pot@cnuce.cnr.it (Francesco Potorti`)  for misc. tips.
;; ---------------------------------------------------------------------------
;; TODO:
;;
;; Save window configuration.
;; Recognize more minor modes.
;; Save mark rings.
;; Start-up with buffer-menu???

;;; Code:

;; Make the compilation more silent
(eval-when-compile
  ;; We use functions from these modules
  ;; We can't (require 'mh-e) since that wants to load something.
  (require 'info))
;; ----------------------------------------------------------------------------
;; USER OPTIONS -- settings you might want to play with.
;; ----------------------------------------------------------------------------

(defgroup desktop nil
  "Save partial status of Emacs when killed"
  :group 'frames)

(defconst desktop-basefilename
  (if (or (eq system-type 'ms-dos) (eq system-type 'windows-nt))
      "emacs.dsk" ; Ms-Dos does not support multiple dots in file name
    ".emacs.desktop")
  "File for Emacs desktop, not including the directory name.")

(defcustom desktop-missing-file-warning t
  "*If non-nil then desktop warns when a file no longer exists.
Otherwise it simply ignores that file."
  :type 'boolean
  :group 'desktop)

(defcustom desktop-globals-to-save
  (list 'desktop-missing-file-warning
	;; Feature: saving kill-ring implies saving kill-ring-yank-pointer
	;; 'kill-ring
	'tags-file-name
	'tags-table-list
	'search-ring
	'regexp-search-ring
	'register-alist
	;; 'desktop-globals-to-save	; Itself!
	)
  "List of global variables to save when killing Emacs.
An element may be variable name (a symbol)
or a cons cell of the form  (VAR . MAX-SIZE),
which means to truncate VAR's value to at most MAX-SIZE elements
\(if the value is a list) before saving the value."
  :type '(repeat (choice (symbol :tag "Variable")
			 (cons (symbol :tag "Variable")
			       (integer :tag "Size"))))
  :group 'desktop)

(defcustom desktop-locals-to-save
  (list 'desktop-locals-to-save		; Itself!  Think it over.
        'truncate-lines
	'case-fold-search
	'case-replace
	'fill-column
	'overwrite-mode
	'change-log-default-name
	'line-number-mode
	)
  "List of local variables to save for each buffer.
The variables are saved only when they really are local."
  :type '(repeat (choice (symbol :tag "Variable")
			 (cons (symbol :tag "Variable")
			       (integer :tag "Size"))))
  :group 'desktop)
(make-variable-buffer-local 'desktop-locals-to-save)

;; We skip .log files because they are normally temporary.
;;         (ftp) files because they require passwords and whatnot.
;;         TAGS files to save time (tags-file-name is saved instead).
(defcustom desktop-buffers-not-to-save
 "\\(^nn\\.a[0-9]+\\|\\.log\\|(ftp)\\|^tags\\|^TAGS\\)$"
 "Regexp identifying buffers that are to be excluded from saving."
 :type 'regexp
 :group 'desktop)

;; Skip ange-ftp files
(defcustom desktop-files-not-to-save
  "^/[^/:]*:"
  "Regexp identifying files whose buffers are to be excluded from saving."
  :type 'regexp
  :group 'desktop)

(defvar desktop-buffer-major-mode nil
  "When desktop creates a buffer, this holds the desired Major mode.")

(defvar desktop-buffer-file-name nil
  "When desktop creates a buffer, this holds the file name to visit.")

(defvar desktop-buffer-name nil
  "When desktop creates a buffer, this holds the desired buffer name.")

(defvar desktop-buffer-misc nil
  "When desktop creates a buffer, this holds a list of misc info.
It is used by the `desktop-buffer-handlers' functions.")

(defcustom desktop-buffer-handlers
  '(desktop-buffer-dired
    desktop-buffer-rmail
    desktop-buffer-mh
    desktop-buffer-info
    desktop-buffer-file)
  "*List of functions to call in order to create a buffer.
The functions are called without explicit parameters but can use the
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."
  :type '(repeat function)
  :group 'desktop)

(defvar desktop-create-buffer-form "(desktop-create-buffer 205"
  "Opening of form for creation of new buffers.")

(defcustom desktop-save-hook nil
  "Hook run before saving the desktop to allow you to cut history lists and
the like shorter."
  :type 'hook
  :group 'desktop)
;; ----------------------------------------------------------------------------
(defvar desktop-dirname nil
  "The directory in which the current desktop file resides.")

(defconst desktop-header
";; --------------------------------------------------------------------------
;; Desktop File for Emacs
;; --------------------------------------------------------------------------
" "*Header to place in Desktop file.")

(defvar desktop-delay-hook nil
  "Hooks run after all buffers are loaded; intended for internal use.")
;; ----------------------------------------------------------------------------
(defun desktop-truncate (l n)
  "Truncate LIST to at most N elements destructively."
  (let ((here (nthcdr (1- n) l)))
    (if (consp here)
	(setcdr here nil))))
;; ----------------------------------------------------------------------------
(defun desktop-clear () "Empty the Desktop."
  (interactive)
  (setq kill-ring nil
	kill-ring-yank-pointer nil
	search-ring nil
	search-ring-yank-pointer nil
	regexp-search-ring nil
	regexp-search-ring-yank-pointer nil)
  (mapcar (function (lambda (x)
		      ;; XEmacs change
		      (if (not (equal (buffer-name x) "*Warnings*"))
			  (kill-buffer x)))) (buffer-list))
  (delete-other-windows))
;; ----------------------------------------------------------------------------
(add-hook 'kill-emacs-hook 'desktop-kill)

(defun desktop-kill ()
  (if desktop-dirname
      (condition-case err
	  (desktop-save desktop-dirname)
	(file-error
	 (if (yes-or-no-p "Error while saving the desktop.  Quit anyway? ")
	     nil
	   (signal (car err) (cdr err)))))))
;; ----------------------------------------------------------------------------
(defun desktop-list* (&rest args)
  (if (null (cdr args))
      (car args)
    (setq args (nreverse args))
    (let ((value (cons (nth 1 args) (car args))))
      (setq args (cdr (cdr args)))
      (while args
	(setq value (cons (car args) value))
	(setq args (cdr args)))
      value)))

(defun desktop-internal-v2s (val)
  "Convert VALUE to a pair (QUOTE . TXT); (eval (read TXT)) gives VALUE.
TXT is a string that when read and evaluated yields value.
QUOTE may be `may' (value may be quoted),
`must' (values must be quoted), or nil (value may not be quoted)."
  (cond
   ((or (numberp val) (characterp val) (null val) (eq t val))
    (cons 'may (prin1-to-string val)))
   ((stringp val)
    (let ((copy (copy-sequence val)))
      (set-text-properties 0 (length copy) nil copy)
      ;; Get rid of text properties because we cannot read them
      (cons 'may (prin1-to-string copy))))
   ((symbolp val)
    (cons 'must (prin1-to-string val)))
   ((vectorp val)
    (let* ((special nil)
	   (pass1 (mapcar
		   (lambda (el)
		     (let ((res (desktop-internal-v2s el)))
		       (if (null (car res))
			   (setq special t))
		       res))
		   val)))
      (if special
	  (cons nil (concat "(vector "
			    (mapconcat (lambda (el)
					 (if (eq (car el) 'must)
					     (concat "'" (cdr el))
					   (cdr el)))
				       pass1
				       " ")
			    ")"))
	(cons 'may (concat "[" (mapconcat 'cdr pass1 " ") "]")))))
   ((consp val)
    (let ((p val)
	  newlist
	  use-list*
	  anynil)
      (while (consp p)
	(let ((q.txt (desktop-internal-v2s (car p))))
	  (or anynil (setq anynil (null (car q.txt))))
	  (setq newlist (cons q.txt newlist)))
	(setq p (cdr p)))
      (if p
	  (let ((last (desktop-internal-v2s p))
		(el (car newlist)))
	    (or anynil (setq anynil (null (car last))))
	    (or anynil
		(setq newlist (cons '(must . ".") newlist)))
	    (setq use-list* t)
	    (setq newlist (cons last newlist))))
      (setq newlist (nreverse newlist))
      (if anynil
	  (cons nil
		(concat (if use-list* "(desktop-list* "  "(list ")
			(mapconcat (lambda (el)
				     (if (eq (car el) 'must)
					 (concat "'" (cdr el))
				       (cdr el)))
				   newlist
				   " ")
			")"))
	(cons 'must
	      (concat "(" (mapconcat 'cdr newlist " ") ")")))))
   ((subrp val)
    (cons nil (concat "(symbol-function '"
		      (substring (prin1-to-string val) 7 -1)
		      ")")))
   ((markerp val)
    (let ((pos (prin1-to-string (marker-position val)))
	  (buf (prin1-to-string (buffer-name (marker-buffer val)))))
      (cons nil (concat "(let ((mk (make-marker)))"
			" (add-hook 'desktop-delay-hook"
			" (list 'lambda '() (list 'set-marker mk "
			pos " (get-buffer " buf ")))) mk)"))))
   (t					; save as text
    (cons 'may "\"Unprintable entity\""))))

(defun desktop-value-to-string (val)
  "Convert VALUE to a string that when read evaluates to the same value.
Not all types of values are supported."
  (let* ((print-escape-newlines t)
	 (float-output-format nil)
	 (quote.txt (desktop-internal-v2s val))
	 (quote (car quote.txt))
	 (txt (cdr quote.txt)))
    (if (eq quote 'must)
	(concat "'" txt)
      txt)))
;; ----------------------------------------------------------------------------
(defun desktop-outvar (varspec)
  "Output a setq statement for variable VAR to the desktop file.
The argument VARSPEC may be the variable name VAR (a symbol),
or a cons cell of the form  (VAR . MAX-SIZE),
which means to truncate VAR's value to at most MAX-SIZE elements
\(if the value is a list) before saving the value."
  (let (var size)
    (if (consp varspec)
	(setq var (car varspec) size (cdr varspec))
      (setq var varspec))
    (if (boundp var)
	(progn
	  (if (and (integerp size)
		   (> size 0)
		   (listp (eval var)))
	      (desktop-truncate (eval var) size)) 
	  (insert "(setq "
		  (symbol-name var)
		  " "
		  (desktop-value-to-string (symbol-value var))
		  ")\n")))))
;; ----------------------------------------------------------------------------
(defun desktop-save-buffer-p (filename bufname mode &rest dummy)
  "Return t if the desktop should record a particular buffer for next startup.
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))))))
;; ----------------------------------------------------------------------------
(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 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
				     (not (null (mark)))) ; XEmacs
			       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)
			       )))
		  (buffer-list))))
	  (buf (get-buffer-create "*desktop*")))
      (set-buffer buf)
      (erase-buffer)

      (insert desktop-header
	      ";; Created " (current-time-string) "\n"
	      ";; Emacs version " emacs-version "\n\n"
	      ";; Global section:\n")
      (mapcar (function desktop-outvar) desktop-globals-to-save)
      (if (memq 'kill-ring desktop-globals-to-save)
	  (insert "(setq kill-ring-yank-pointer (nthcdr "
		  (int-to-string
		   (- (length kill-ring) (length kill-ring-yank-pointer)))
		  " kill-ring))\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")))))
       info)
      (setq default-directory dirname)
      (if (file-exists-p filename) (delete-file filename))
      (write-region (point-min) (point-max) filename nil 'nomessage)))
  (setq desktop-dirname dirname))
;; ----------------------------------------------------------------------------
(defun desktop-remove ()
  "Delete the Desktop file and inactivate the desktop system."
  (interactive)
  (if desktop-dirname
      (let ((filename (expand-file-name desktop-basefilename desktop-dirname)))
	(setq desktop-dirname nil)
	(if (file-exists-p filename)
	    (delete-file filename)))))
;; ----------------------------------------------------------------------------
(defun desktop-read ()
  "Read the Desktop file and the files it specifies.
This is a no-op when Emacs is running in batch mode."
  (interactive)
  (if noninteractive
      nil
    (let ((dirs '("./" "~/")))
      (while (and dirs
		  (not (file-exists-p (expand-file-name
				       desktop-basefilename
				       (car dirs)))))
	(setq dirs (cdr dirs)))
      (setq desktop-dirname (and dirs (expand-file-name (car dirs))))
      (if desktop-dirname
	  (progn
	    (load (expand-file-name desktop-basefilename desktop-dirname)
		  t t t)
	    (run-hooks 'desktop-delay-hook)
	    (setq desktop-delay-hook nil)
	    (message "Desktop loaded."))
	(desktop-clear)))))
;; ----------------------------------------------------------------------------
(defun desktop-load-default ()
  "Load the `default' start-up library manually.
Also inhibit further loading of it.  Call this from your `.emacs' file
to provide correct modes for autoloaded files."
  (if (not inhibit-default-init)	; safety check
      (progn
	(load "default" t t)
	(setq inhibit-default-init t))))
;; ----------------------------------------------------------------------------
;; Note: the following functions use the dynamic variable binding in Lisp.
;;
(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))
	t)))
;; ----------------------------------------------------------------------------
(defun desktop-buffer-rmail () "Load an RMAIL file."
  (if (eq 'rmail-mode desktop-buffer-major-mode)
      (condition-case error
	  (progn (rmail-input desktop-buffer-file-name) t)
	(file-locked
	 (kill-buffer (current-buffer))
	 'ignored))))
;; ----------------------------------------------------------------------------
(defun desktop-buffer-mh () "Load a folder in the mh system."
  (if (eq 'mh-folder-mode desktop-buffer-major-mode)
      (progn
	(require 'mh-e)
	(mh-find-path)
	(mh-visit-folder desktop-buffer-name)
	t)))
;; ----------------------------------------------------------------------------
(defun desktop-buffer-dired () "Load a directory using dired."
  (if (eq 'dired-mode desktop-buffer-major-mode)
      (if (file-directory-p (file-name-directory (car desktop-buffer-misc)))
	  (progn
	    (dired (car desktop-buffer-misc))
	    (mapcar 'dired-insert-subdir (cdr desktop-buffer-misc))
	    t)
	(message "Directory %s no longer exists." (car desktop-buffer-misc))
	(sit-for 1)
	'ignored)))
;; ----------------------------------------------------------------------------
(defun desktop-buffer-file () "Load a file."
  (if desktop-buffer-file-name
      (if (or (file-exists-p desktop-buffer-file-name)
	      (and desktop-missing-file-warning
		   (y-or-n-p (format
			      "File \"%s\" no longer exists. Re-create? "
			      desktop-buffer-file-name))))
	  (progn (find-file desktop-buffer-file-name) t)
	'ignored)))
;; ----------------------------------------------------------------------------
;; Create a buffer, load its file, set is mode, ...;  called from Desktop file
;; only.
(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)
  (let ((hlist desktop-buffer-handlers)
	(result)
	(handler))
    (while (and (not result) hlist)
      (setq handler (car hlist))
      (setq result (funcall handler))
      (setq hlist (cdr hlist)))
    (if (eq result t)
	(progn
	  (if (not (equal (buffer-name) desktop-buffer-name))
	      (rename-buffer desktop-buffer-name))
	  (auto-fill-mode (if (nth 0 mim) 1 0))
	  (goto-char pt)
	  (if (consp mk)
	      (progn
		(set-mark (car mk))
;;		(setq mark-active (car (cdr mk))))
                (if (car (cdr mk)) (zmacs-activate-region))) ; XEmacs
	    (set-mark mk))
	  ;; Never override file system if the file really is read-only marked.
	  (if ro (setq buffer-read-only ro))
	  (while locals
	    (let ((this (car locals)))
	      (if (consp this)
		  ;; an entry of this form `(symbol . value)'
		  (progn
		    (make-local-variable (car this))
		    (set (car this) (cdr this)))
		;; an entry of the form `symbol'
		(make-local-variable this)
		(makunbound this)))
	    (setq locals (cdr locals)))
	  ))))

;; Backward compatibility -- update parameters to 205 standards.
(defun desktop-buffer (desktop-buffer-file-name desktop-buffer-name
						desktop-buffer-major-mode
						mim pt mk ro tl fc cfs cr
						desktop-buffer-misc)
  (desktop-create-buffer 205 desktop-buffer-file-name desktop-buffer-name
			 desktop-buffer-major-mode (cdr mim) pt mk ro
			 desktop-buffer-misc
			 (list (cons 'truncate-lines tl)
			       (cons 'fill-column fc)
			       (cons 'case-fold-search cfs)
			       (cons 'case-replace cr)
			       (cons 'overwrite-mode (car mim)))))
;; ----------------------------------------------------------------------------
(provide 'desktop)

;; desktop.el ends here.
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