code.delx.au - gnu-emacs/blob - lisp/desktop.el

   1 ;;; desktop.el --- save partial status of Emacs when killed
   2
   3 ;; Copyright (C) 1993, 1994, 1995, 1997, 2000, 2001, 2002, 2003,
   4 ;;   2004, 2005, 2006 Free Software Foundation, Inc.
   5
   6 ;; Author: Morten Welinder <terra@diku.dk>
   7 ;; Maintainter: Lars Hansen <larsh@soem.dk>
   8 ;; Keywords: convenience
   9 ;; Favourite-brand-of-beer: None, I hate beer.
  10
  11 ;; This file is part of GNU Emacs.
  12
  13 ;; GNU Emacs is free software; you can redistribute it and/or modify
  14 ;; it under the terms of the GNU General Public License as published by
  15 ;; the Free Software Foundation; either version 2, or (at your option)
  16 ;; any later version.
  17
  18 ;; GNU Emacs is distributed in the hope that it will be useful,
  19 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  20 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  21 ;; GNU General Public License for more details.
  22
  23 ;; You should have received a copy of the GNU General Public License
  24 ;; along with GNU Emacs; see the file COPYING.  If not, write to the
  25 ;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  26 ;; Boston, MA 02110-1301, USA.
  27
  28 ;;; Commentary:
  29
  30 ;; Save the Desktop, i.e.,
  31 ;;      - some global variables
  32 ;;      - the list of buffers with associated files.  For each buffer also
  33 ;;              - the major mode
  34 ;;              - the default directory
  35 ;;              - the point
  36 ;;              - the mark & mark-active
  37 ;;              - buffer-read-only
  38 ;;              - some local variables
  39
  40 ;; To use this, use customize to turn on desktop-save-mode or add the
  41 ;; following line somewhere in your .emacs file:
  42 ;;
  43 ;;      (desktop-save-mode 1)
  44 ;;
  45 ;; For further usage information, look at the section
  46 ;; "Saving Emacs Sessions" in the GNU Emacs Manual.
  47
  48 ;; When the desktop module is loaded, the function `desktop-kill' is
  49 ;; added to the `kill-emacs-hook'. This function is responsible for
  50 ;; saving the desktop when Emacs is killed.  Furthermore an anonymous
  51 ;; function is added to the `after-init-hook'. This function is
  52 ;; responsible for loading the desktop when Emacs is started.
  53
  54 ;; Special handling.
  55 ;; -----------------
  56 ;; Variables `desktop-buffer-mode-handlers' and `desktop-minor-mode-handlers'
  57 ;; are supplied to handle special major and minor modes respectively.
  58 ;; `desktop-buffer-mode-handlers' is an alist of major mode specific functions
  59 ;; to restore a desktop buffer. Elements must have the form
  60 ;;
  61 ;;    (MAJOR-MODE . RESTORE-BUFFER-FUNCTION).
  62 ;;
  63 ;; Functions listed are called by `desktop-create-buffer' when `desktop-read'
  64 ;; evaluates the desktop file. Buffers with a major mode not specified here,
  65 ;; are restored by the default handler `desktop-restore-file-buffer'.
  66 ;; `desktop-minor-mode-handlers' is an alist of functions to restore
  67 ;; non-standard minor modes.  Elements must have the form
  68 ;;
  69 ;;    (MINOR-MODE . RESTORE-FUNCTION).
  70 ;;
  71 ;; Functions are called by `desktop-create-buffer' to restore minor modes.
  72 ;; Minor modes not specified here, are restored by the standard minor mode
  73 ;; function.  If you write a module that defines a major or minor mode that
  74 ;; needs a special handler, then place code like
  75
  76 ;;    (defun foo-restore-desktop-buffer
  77 ;;    ...
  78 ;;    (add-to-list 'desktop-buffer-mode-handlers
  79 ;;                 '(foo-mode . foo-restore-desktop-buffer))
  80
  81 ;; or
  82
  83 ;;    (defun bar-desktop-restore
  84 ;;    ...
  85 ;;    (add-to-list 'desktop-minor-mode-handlers
  86 ;;                 '(bar-mode . bar-desktop-restore))
  87
  88 ;; in the module itself, and make shure that the mode function is
  89 ;; autoloaded. See the docstrings of `desktop-buffer-mode-handlers' and
  90 ;; `desktop-minor-mode-handlers' for more info.
  91
  92 ;; Minor modes.
  93 ;; ------------
  94 ;; Conventional minor modes (see node "Minor Mode Conventions" in the elisp
  95 ;; manual) are handled in the following way:
  96 ;; When `desktop-save' saves the state of a buffer to the desktop file, it
  97 ;; saves as `desktop-minor-modes' the list of names of those variables in
  98 ;; `minor-mode-alist' that have a non-nil value.
  99 ;; When `desktop-create' restores the buffer, each of the symbols in
 100 ;; `desktop-minor-modes' is called as function with parameter 1.
 101 ;; The variables `desktop-minor-mode-table' and `desktop-minor-mode-handlers'
 102 ;; are used to handle non-conventional minor modes.  `desktop-save' uses
 103 ;; `desktop-minor-mode-table' to map minor mode variables to minor mode
 104 ;; functions before writing `desktop-minor-modes'. If a minor mode has a
 105 ;; variable name that is different form its function name, an entry
 106
 107 ;;    (NAME RESTORE-FUNCTION)
 108
 109 ;; should be added to `desktop-minor-mode-table'.  If a minor mode should not
 110 ;; be restored, RESTORE-FUNCTION should be set to nil.  `desktop-create' uses
 111 ;; `desktop-minor-mode-handlers' to lookup minor modes that needs a restore
 112 ;; function different from the usual minor mode function.
 113 ;; ---------------------------------------------------------------------------
 114
 115 ;; By the way: don't use desktop.el to customize Emacs -- the file .emacs
 116 ;; in your home directory is used for that.  Saving global default values
 117 ;; for buffers is an example of misuse.
 118
 119 ;; PLEASE NOTE: The kill ring can be saved as specified by the variable
 120 ;; `desktop-globals-to-save' (by default it isn't).  This may result in saving
 121 ;; things you did not mean to keep.  Use M-x desktop-clear RET.
 122
 123 ;; Thanks to  hetrick@phys.uva.nl (Jim Hetrick)      for useful ideas.
 124 ;;            avk@rtsg.mot.com (Andrew V. Klein)     for a dired tip.
 125 ;;            chris@tecc.co.uk (Chris Boucher)       for a mark tip.
 126 ;;            f89-kam@nada.kth.se (Klas Mellbourn)   for a mh-e tip.
 127 ;;            kifer@sbkifer.cs.sunysb.edu (M. Kifer) for a bug hunt.
 128 ;;            treese@lcs.mit.edu (Win Treese)        for ange-ftp tips.
 129 ;;            pot@cnuce.cnr.it (Francesco Potorti`)  for misc. tips.
 130 ;; ---------------------------------------------------------------------------
 131 ;; TODO:
 132 ;;
 133 ;; Save window configuration.
 134 ;; Recognize more minor modes.
 135 ;; Save mark rings.
 136
 137 ;;; Code:
 138
 139 (defvar desktop-file-version "206"
 140   "Version number of desktop file format.
 141 Written into the desktop file and used at desktop read to provide
 142 backward compatibility.")
 143
 144 ;; ----------------------------------------------------------------------------
 145 ;; USER OPTIONS -- settings you might want to play with.
 146 ;; ----------------------------------------------------------------------------
 147
 148 (defgroup desktop nil
 149   "Save status of Emacs when you exit."
 150   :group 'frames)
 151
 152 ;;;###autoload
 153 (define-minor-mode desktop-save-mode
 154   "Toggle desktop saving mode.
 155 With numeric ARG, turn desktop saving on if ARG is positive, off
 156 otherwise.  See variable `desktop-save' for a description of when the
 157 desktop is saved."
 158   :global t
 159   :group 'desktop)
 160
 161 ;; Maintained for backward compatibility
 162 (define-obsolete-variable-alias 'desktop-enable
 163                                 'desktop-save-mode "22.1")
 164
 165 (defcustom desktop-save 'ask-if-new
 166   "*Specifies whether the desktop should be saved when it is killed.
 167 A desktop is killed when the user changes desktop or quits Emacs.
 168 Possible values are:
 169    t             -- always save.
 170    ask           -- always ask.
 171    ask-if-new    -- ask if no desktop file exists, otherwise just save.
 172    ask-if-exists -- ask if desktop file exists, otherwise don't save.
 173    if-exists     -- save if desktop file exists, otherwise don't save.
 174    nil           -- never save.
 175 The desktop is never saved when `desktop-save-mode' is nil.
 176 The variables `desktop-dirname' and `desktop-base-file-name'
 177 determine where the desktop is saved."
 178   :type '(choice
 179     (const :tag "Always save" t)
 180     (const :tag "Always ask" ask)
 181     (const :tag "Ask if desktop file is new, else do save" ask-if-new)
 182     (const :tag "Ask if desktop file exists, else don't save" ask-if-exists)
 183     (const :tag "Save if desktop file exists, else don't" if-exists)
 184     (const :tag "Never save" nil))
 185   :group 'desktop
 186   :version "22.1")
 187
 188 (defcustom desktop-base-file-name
 189   (convert-standard-filename ".emacs.desktop")
 190   "Name of file for Emacs desktop, excluding the directory part."
 191   :type 'file
 192   :group 'desktop)
 193 (define-obsolete-variable-alias 'desktop-basefilename
 194                                 'desktop-base-file-name "22.1")
 195
 196 (defcustom desktop-path '("." "~")
 197   "List of directories to search for the desktop file.
 198 The base name of the file is specified in `desktop-base-file-name'."
 199   :type '(repeat directory)
 200   :group 'desktop
 201   :version "22.1")
 202
 203 (defcustom desktop-missing-file-warning nil
 204   "*If non-nil then `desktop-read' asks if a non-existent file should be recreated.
 205 Also pause for a moment to display message about errors signaled in
 206 `desktop-buffer-mode-handlers'.
 207
 208 If nil, just print error messages in the message buffer."
 209   :type 'boolean
 210   :group 'desktop
 211   :version "22.1")
 212
 213 (defcustom desktop-no-desktop-file-hook nil
 214   "Normal hook run when `desktop-read' can't find a desktop file.
 215 May be used to show a dired buffer."
 216   :type 'hook
 217   :group 'desktop
 218   :version "22.1")
 219
 220 (defcustom desktop-after-read-hook nil
 221   "Normal hook run after a successful `desktop-read'.
 222 May be used to show a buffer list."
 223   :type 'hook
 224   :group 'desktop
 225   :version "22.1")
 226
 227 (defcustom desktop-save-hook nil
 228   "Normal hook run before the desktop is saved in a desktop file.
 229 This is useful for truncating history lists, for example."
 230   :type 'hook
 231   :group 'desktop)
 232
 233 (defcustom desktop-globals-to-save
 234   '(desktop-missing-file-warning
 235     tags-file-name
 236     tags-table-list
 237     search-ring
 238     regexp-search-ring
 239     register-alist)
 240   "List of global variables saved by `desktop-save'.
 241 An element may be variable name (a symbol) or a cons cell of the form
 242 \(VAR . MAX-SIZE), which means to truncate VAR's value to at most
 243 MAX-SIZE elements (if the value is a list) before saving the value.
 244 Feature: Saving `kill-ring' implies saving `kill-ring-yank-pointer'."
 245   :type '(repeat (restricted-sexp :match-alternatives (symbolp consp)))
 246   :group 'desktop)
 247
 248 (defcustom desktop-globals-to-clear
 249   '(kill-ring
 250     kill-ring-yank-pointer
 251     search-ring
 252     search-ring-yank-pointer
 253     regexp-search-ring
 254     regexp-search-ring-yank-pointer)
 255   "List of global variables that `desktop-clear' will clear.
 256 An element may be variable name (a symbol) or a cons cell of the form
 257 \(VAR . FORM).  Symbols are set to nil and for cons cells VAR is set
 258 to the value obtained by evaluating FORM."
 259   :type '(repeat (restricted-sexp :match-alternatives (symbolp consp)))
 260   :group 'desktop
 261   :version "22.1")
 262
 263 (defcustom desktop-clear-preserve-buffers
 264   '("\\*scratch\\*" "\\*Messages\\*" "\\*server\\*" "\\*tramp/.+\\*")
 265   "*List of buffers that `desktop-clear' should not delete.
 266 Each element is a regular expression.  Buffers with a name matched by any of
 267 these won't be deleted."
 268   :type '(repeat string)
 269   :group 'desktop)
 270
 271 ;;;###autoload
 272 (defcustom desktop-locals-to-save
 273   '(desktop-locals-to-save  ; Itself!  Think it over.
 274     truncate-lines
 275     case-fold-search
 276     case-replace
 277     fill-column
 278     overwrite-mode
 279     change-log-default-name
 280     line-number-mode
 281     column-number-mode
 282     size-indication-mode
 283     buffer-file-coding-system
 284     indent-tabs-mode
 285     indicate-buffer-boundaries
 286     indicate-empty-lines
 287     show-trailing-whitespace)
 288   "List of local variables to save for each buffer.
 289 The variables are saved only when they really are local.  Conventional minor
 290 modes are restored automatically; they should not be listed here."
 291   :type '(repeat symbol)
 292   :group 'desktop)
 293
 294 ;; We skip .log files because they are normally temporary.
 295 ;;         (ftp) files because they require passwords and whatnot.
 296 (defcustom desktop-buffers-not-to-save
 297   "\\(^nn\\.a[0-9]+\\|\\.log\\|(ftp)\\)$"
 298   "Regexp identifying buffers that are to be excluded from saving."
 299   :type 'regexp
 300   :group 'desktop)
 301
 302 ;; Skip tramp and ange-ftp files
 303 (defcustom desktop-files-not-to-save
 304   "^/[^/:]*:"
 305   "Regexp identifying files whose buffers are to be excluded from saving."
 306   :type 'regexp
 307   :group 'desktop)
 308
 309 ;; We skip TAGS files to save time (tags-file-name is saved instead).
 310 (defcustom desktop-modes-not-to-save
 311   '(tags-table-mode)
 312   "List of major modes whose buffers should not be saved."
 313   :type '(repeat symbol)
 314   :group 'desktop)
 315
 316 (defcustom desktop-file-name-format 'absolute
 317   "*Format in which desktop file names should be saved.
 318 Possible values are:
 319    absolute -- Absolute file name.
 320    tilde    -- Relative to ~.
 321    local    -- Relative to directory of desktop file."
 322   :type '(choice (const absolute) (const tilde) (const local))
 323   :group 'desktop
 324   :version "22.1")
 325
 326 (defcustom desktop-restore-eager t
 327   "Number of buffers to restore immediately.
 328 Remaining buffers are restored lazily (when Emacs is idle).
 329 If value is t, all buffers are restored immediately."
 330   :type '(choice (const t) integer)
 331   :group 'desktop
 332   :version "22.1")
 333
 334 (defcustom desktop-lazy-verbose t
 335   "Verbose reporting of lazily created buffers."
 336   :type 'boolean
 337   :group 'desktop
 338   :version "22.1")
 339
 340 (defcustom desktop-lazy-idle-delay 5
 341   "Idle delay before starting to create buffers.
 342 See `desktop-restore-eager'."
 343   :type 'integer
 344   :group 'desktop
 345   :version "22.1")
 346
 347 ;;;###autoload
 348 (defvar desktop-save-buffer nil
 349   "When non-nil, save buffer status in desktop file.
 350 This variable becomes buffer local when set.
 351
 352 If the value is a function, it is called by `desktop-save' with argument
 353 DESKTOP-DIRNAME to obtain auxiliary information to save in the desktop
 354 file along with the state of the buffer for which it was called.
 355
 356 When file names are returned, they should be formatted using the call
 357 \"(desktop-file-name FILE-NAME DESKTOP-DIRNAME)\".
 358
 359 Later, when `desktop-read' evaluates the desktop file, auxiliary information
 360 is passed as the argument DESKTOP-BUFFER-MISC to functions in
 361 `desktop-buffer-mode-handlers'.")
 362 (make-variable-buffer-local 'desktop-save-buffer)
 363 (make-obsolete-variable 'desktop-buffer-modes-to-save
 364                         'desktop-save-buffer "22.1")
 365 (make-obsolete-variable 'desktop-buffer-misc-functions
 366                         'desktop-save-buffer "22.1")
 367
 368 ;;;###autoload
 369 (defvar desktop-buffer-mode-handlers
 370   nil
 371   "Alist of major mode specific functions to restore a desktop buffer.
 372 Functions listed are called by `desktop-create-buffer' when `desktop-read'
 373 evaluates the desktop file.  List elements must have the form
 374
 375    (MAJOR-MODE . RESTORE-BUFFER-FUNCTION).
 376
 377 Buffers with a major mode not specified here, are restored by the default
 378 handler `desktop-restore-file-buffer'.
 379
 380 Handlers are called with argument list
 381
 382    (DESKTOP-BUFFER-FILE-NAME DESKTOP-BUFFER-NAME DESKTOP-BUFFER-MISC)
 383
 384 Furthermore, they may use the following variables:
 385
 386    desktop-file-version
 387    desktop-buffer-major-mode
 388    desktop-buffer-minor-modes
 389    desktop-buffer-point
 390    desktop-buffer-mark
 391    desktop-buffer-read-only
 392    desktop-buffer-locals
 393
 394 If a handler returns a buffer, then the saved mode settings
 395 and variable values for that buffer are copied into it.
 396
 397 Modules that define a major mode that needs a special handler should contain
 398 code like
 399
 400    (defun foo-restore-desktop-buffer
 401    ...
 402    (add-to-list 'desktop-buffer-mode-handlers
 403                 '(foo-mode . foo-restore-desktop-buffer))
 404
 405 Furthermore the major mode function must be autoloaded.")
 406
 407 ;;;###autoload
 408 (put 'desktop-buffer-mode-handlers 'risky-local-variable t)
 409 (make-obsolete-variable 'desktop-buffer-handlers
 410                         'desktop-buffer-mode-handlers "22.1")
 411
 412 (defcustom desktop-minor-mode-table
 413   '((auto-fill-function auto-fill-mode)
 414     (vc-mode nil)
 415     (vc-dired-mode nil))
 416   "Table mapping minor mode variables to minor mode functions.
 417 Each entry has the form (NAME RESTORE-FUNCTION).
 418 NAME is the name of the buffer-local variable indicating that the minor
 419 mode is active.  RESTORE-FUNCTION is the function to activate the minor mode.
 420 called.  RESTORE-FUNCTION nil means don't try to restore the minor mode.
 421 Only minor modes for which the name of the buffer-local variable
 422 and the name of the minor mode function are different have to be added to
 423 this table.  See also `desktop-minor-mode-handlers'."
 424   :type 'sexp
 425   :group 'desktop)
 426
 427 ;;;###autoload
 428 (defvar desktop-minor-mode-handlers
 429   nil
 430   "Alist of functions to restore non-standard minor modes.
 431 Functions are called by `desktop-create-buffer' to restore minor modes.
 432 List elements must have the form
 433
 434    (MINOR-MODE . RESTORE-FUNCTION).
 435
 436 Minor modes not specified here, are restored by the standard minor mode
 437 function.
 438
 439 Handlers are called with argument list
 440
 441    (DESKTOP-BUFFER-LOCALS)
 442
 443 Furthermore, they may use the following variables:
 444
 445    desktop-file-version
 446    desktop-buffer-file-name
 447    desktop-buffer-name
 448    desktop-buffer-major-mode
 449    desktop-buffer-minor-modes
 450    desktop-buffer-point
 451    desktop-buffer-mark
 452    desktop-buffer-read-only
 453    desktop-buffer-misc
 454
 455 When a handler is called, the buffer has been created and the major mode has
 456 been set, but local variables listed in desktop-buffer-locals has not yet been
 457 created and set.
 458
 459 Modules that define a minor mode that needs a special handler should contain
 460 code like
 461
 462    (defun foo-desktop-restore
 463    ...
 464    (add-to-list 'desktop-minor-mode-handlers
 465                 '(foo-mode . foo-desktop-restore))
 466
 467 Furthermore the minor mode function must be autoloaded.
 468
 469 See also `desktop-minor-mode-table'.")
 470
 471 ;;;###autoload
 472 (put 'desktop-minor-mode-handlers 'risky-local-variable t)
 473
 474 ;; ----------------------------------------------------------------------------
 475 (defvar desktop-dirname nil
 476   "The directory in which the desktop file should be saved.")
 477
 478 (defconst desktop-header
 479 ";; --------------------------------------------------------------------------
 480 ;; Desktop File for Emacs
 481 ;; --------------------------------------------------------------------------
 482 " "*Header to place in Desktop file.")
 483
 484 (defvar desktop-delay-hook nil
 485   "Hooks run after all buffers are loaded; intended for internal use.")
 486
 487 ;; ----------------------------------------------------------------------------
 488 (defun desktop-truncate (list n)
 489   "Truncate LIST to at most N elements destructively."
 490   (let ((here (nthcdr (1- n) list)))
 491     (if (consp here)
 492         (setcdr here nil))))
 493
 494 ;; ----------------------------------------------------------------------------
 495 (defun desktop-clear ()
 496   "Empty the Desktop.
 497 This kills all buffers except for internal ones and those with names matched by
 498 a regular expression in the list `desktop-clear-preserve-buffers'.
 499 Furthermore, it clears the variables listed in `desktop-globals-to-clear'."
 500   (interactive)
 501   (desktop-lazy-abort)
 502   (dolist (var desktop-globals-to-clear)
 503     (if (symbolp var)
 504       (eval `(setq-default ,var nil))
 505       (eval `(setq-default ,(car var) ,(cdr var)))))
 506   (let ((buffers (buffer-list))
 507         (preserve-regexp (concat "^\\("
 508                                  (mapconcat (lambda (regexp)
 509                                               (concat "\\(" regexp "\\)"))
 510                                             desktop-clear-preserve-buffers
 511                                             "\\|")
 512                                  "\\)$")))
 513     (while buffers
 514       (let ((bufname (buffer-name (car buffers))))
 515          (or
 516            (null bufname)
 517            (string-match preserve-regexp bufname)
 518            ;; Don't kill buffers made for internal purposes.
 519            (and (not (equal bufname "")) (eq (aref bufname 0) ?\s))
 520            (kill-buffer (car buffers))))
 521       (setq buffers (cdr buffers))))
 522   (delete-other-windows))
 523
 524 ;; ----------------------------------------------------------------------------
 525 (add-hook 'kill-emacs-hook 'desktop-kill)
 526
 527 (defun desktop-kill ()
 528   "If `desktop-save-mode' is non-nil, do what `desktop-save' says to do.
 529 If the desktop should be saved and `desktop-dirname'
 530 is nil, ask the user where to save the desktop."
 531   (when
 532     (and
 533       desktop-save-mode
 534       (let ((exists (file-exists-p (expand-file-name desktop-base-file-name desktop-dirname))))
 535         (or
 536           (eq desktop-save t)
 537           (and exists (memq desktop-save '(ask-if-new if-exists)))
 538           (and
 539             (or
 540               (memq desktop-save '(ask ask-if-new))
 541               (and exists (eq desktop-save 'ask-if-exists)))
 542             (y-or-n-p "Save desktop? ")))))
 543     (unless desktop-dirname
 544       (setq desktop-dirname
 545         (file-name-as-directory
 546           (expand-file-name
 547             (call-interactively
 548               (lambda (dir) (interactive "DDirectory for desktop file: ") dir))))))
 549     (condition-case err
 550       (desktop-save desktop-dirname)
 551       (file-error
 552         (unless (yes-or-no-p "Error while saving the desktop.  Ignore? ")
 553           (signal (car err) (cdr err)))))))
 554
 555 ;; ----------------------------------------------------------------------------
 556 (defun desktop-list* (&rest args)
 557   (if (null (cdr args))
 558       (car args)
 559     (setq args (nreverse args))
 560     (let ((value (cons (nth 1 args) (car args))))
 561       (setq args (cdr (cdr args)))
 562       (while args
 563         (setq value (cons (car args) value))
 564         (setq args (cdr args)))
 565       value)))
 566
 567 ;; ----------------------------------------------------------------------------
 568 (defun desktop-internal-v2s (value)
 569   "Convert VALUE to a pair (QUOTE . TXT); (eval (read TXT)) gives VALUE.
 570 TXT is a string that when read and evaluated yields value.
 571 QUOTE may be `may' (value may be quoted),
 572 `must' (values must be quoted), or nil (value may not be quoted)."
 573   (cond
 574    ((or (numberp value) (null value) (eq t value) (keywordp value))
 575     (cons 'may (prin1-to-string value)))
 576    ((stringp value)
 577     (let ((copy (copy-sequence value)))
 578       (set-text-properties 0 (length copy) nil copy)
 579       ;; Get rid of text properties because we cannot read them
 580       (cons 'may (prin1-to-string copy))))
 581    ((symbolp value)
 582     (cons 'must (prin1-to-string value)))
 583    ((vectorp value)
 584     (let* ((special nil)
 585            (pass1 (mapcar
 586                    (lambda (el)
 587                      (let ((res (desktop-internal-v2s el)))
 588                        (if (null (car res))
 589                            (setq special t))
 590                        res))
 591                    value)))
 592       (if special
 593           (cons nil (concat "(vector "
 594                             (mapconcat (lambda (el)
 595                                          (if (eq (car el) 'must)
 596                                              (concat "'" (cdr el))
 597                                            (cdr el)))
 598                                        pass1
 599                                        " ")
 600                             ")"))
 601         (cons 'may (concat "[" (mapconcat 'cdr pass1 " ") "]")))))
 602    ((consp value)
 603     (let ((p value)
 604           newlist
 605           use-list*
 606           anynil)
 607       (while (consp p)
 608         (let ((q.txt (desktop-internal-v2s (car p))))
 609           (or anynil (setq anynil (null (car q.txt))))
 610           (setq newlist (cons q.txt newlist)))
 611         (setq p (cdr p)))
 612       (if p
 613           (let ((last (desktop-internal-v2s p))
 614                 (el (car newlist)))
 615             (or anynil (setq anynil (null (car last))))
 616             (or anynil
 617                 (setq newlist (cons '(must . ".") newlist)))
 618             (setq use-list* t)
 619             (setq newlist (cons last newlist))))
 620       (setq newlist (nreverse newlist))
 621       (if anynil
 622           (cons nil
 623                 (concat (if use-list* "(desktop-list* "  "(list ")
 624                         (mapconcat (lambda (el)
 625                                      (if (eq (car el) 'must)
 626                                          (concat "'" (cdr el))
 627                                        (cdr el)))
 628                                    newlist
 629                                    " ")
 630                         ")"))
 631         (cons 'must
 632               (concat "(" (mapconcat 'cdr newlist " ") ")")))))
 633    ((subrp value)
 634     (cons nil (concat "(symbol-function '"
 635                       (substring (prin1-to-string value) 7 -1)
 636                       ")")))
 637    ((markerp value)
 638     (let ((pos (prin1-to-string (marker-position value)))
 639           (buf (prin1-to-string (buffer-name (marker-buffer value)))))
 640       (cons nil (concat "(let ((mk (make-marker)))"
 641                         " (add-hook 'desktop-delay-hook"
 642                         " (list 'lambda '() (list 'set-marker mk "
 643                         pos " (get-buffer " buf ")))) mk)"))))
 644    (t                                   ; save as text
 645     (cons 'may "\"Unprintable entity\""))))
 646
 647 ;; ----------------------------------------------------------------------------
 648 (defun desktop-value-to-string (value)
 649   "Convert VALUE to a string that when read evaluates to the same value.
 650 Not all types of values are supported."
 651   (let* ((print-escape-newlines t)
 652          (float-output-format nil)
 653          (quote.txt (desktop-internal-v2s value))
 654          (quote (car quote.txt))
 655          (txt (cdr quote.txt)))
 656     (if (eq quote 'must)
 657         (concat "'" txt)
 658       txt)))
 659
 660 ;; ----------------------------------------------------------------------------
 661 (defun desktop-outvar (varspec)
 662   "Output a setq statement for variable VAR to the desktop file.
 663 The argument VARSPEC may be the variable name VAR (a symbol),
 664 or a cons cell of the form (VAR . MAX-SIZE),
 665 which means to truncate VAR's value to at most MAX-SIZE elements
 666 \(if the value is a list) before saving the value."
 667   (let (var size)
 668     (if (consp varspec)
 669         (setq var (car varspec) size (cdr varspec))
 670       (setq var varspec))
 671     (if (boundp var)
 672         (progn
 673           (if (and (integerp size)
 674                    (> size 0)
 675                    (listp (eval var)))
 676               (desktop-truncate (eval var) size))
 677           (insert "(setq "
 678                   (symbol-name var)
 679                   " "
 680                   (desktop-value-to-string (symbol-value var))
 681                   ")\n")))))
 682
 683 ;; ----------------------------------------------------------------------------
 684 (defun desktop-save-buffer-p (filename bufname mode &rest dummy)
 685   "Return t if buffer should have its state saved in the desktop file.
 686 FILENAME is the visited file name, BUFNAME is the buffer name, and
 687 MODE is the major mode.
 688 \n\(fn FILENAME BUFNAME MODE)"
 689   (let ((case-fold-search nil))
 690     (and (not (string-match desktop-buffers-not-to-save bufname))
 691          (not (memq mode desktop-modes-not-to-save))
 692          (or (and filename
 693                   (not (string-match desktop-files-not-to-save filename)))
 694              (and (eq mode 'dired-mode)
 695                   (with-current-buffer bufname
 696                     (not (string-match desktop-files-not-to-save
 697                                        default-directory))))
 698              (and (null filename)
 699                   (with-current-buffer bufname desktop-save-buffer))))))
 700
 701 ;; ----------------------------------------------------------------------------
 702 (defun desktop-file-name (filename dirname)
 703   "Convert FILENAME to format specified in `desktop-file-name-format'.
 704 DIRNAME must be the directory in which the desktop file will be saved."
 705   (cond
 706     ((not filename) nil)
 707     ((eq desktop-file-name-format 'tilde)
 708      (let ((relative-name (file-relative-name (expand-file-name filename) "~")))
 709        (cond
 710          ((file-name-absolute-p relative-name) relative-name)
 711          ((string= "./" relative-name) "~/")
 712          ((string= "." relative-name) "~")
 713          (t (concat "~/" relative-name)))))
 714     ((eq desktop-file-name-format 'local) (file-relative-name filename dirname))
 715     (t (expand-file-name filename))))
 716
 717 ;; ----------------------------------------------------------------------------
 718 (defun desktop-save (dirname)
 719   "Save the desktop in a desktop file.
 720 Parameter DIRNAME specifies where to save the desktop file.
 721 See also `desktop-base-file-name'."
 722   (interactive "DDirectory to save desktop file in: ")
 723   (run-hooks 'desktop-save-hook)
 724   (setq dirname (file-name-as-directory (expand-file-name dirname)))
 725   (save-excursion
 726     (let ((filename (expand-file-name desktop-base-file-name dirname))
 727           (info
 728             (mapcar
 729               #'(lambda (b)
 730                   (set-buffer b)
 731                   (list
 732                     (desktop-file-name (buffer-file-name) dirname)
 733                     (buffer-name)
 734                     major-mode
 735                     ;; minor modes
 736                     (let (ret)
 737                       (mapc
 738                         #'(lambda (minor-mode)
 739                           (and
 740                             (boundp minor-mode)
 741                             (symbol-value minor-mode)
 742                             (let* ((special (assq minor-mode desktop-minor-mode-table))
 743                                    (value (cond (special (cadr special))
 744                                                 ((functionp minor-mode) minor-mode))))
 745                               (when value (add-to-list 'ret value)))))
 746                         (mapcar #'car minor-mode-alist))
 747                       ret)
 748                     (point)
 749                     (list (mark t) mark-active)
 750                     buffer-read-only
 751                     ;; Auxiliary information
 752                     (when (functionp desktop-save-buffer)
 753                       (funcall desktop-save-buffer dirname))
 754                     (let ((locals desktop-locals-to-save)
 755                           (loclist (buffer-local-variables))
 756                           (ll))
 757                       (while locals
 758                         (let ((here (assq (car locals) loclist)))
 759                           (if here
 760                             (setq ll (cons here ll))
 761                             (when (member (car locals) loclist)
 762                               (setq ll (cons (car locals) ll)))))
 763                         (setq locals (cdr locals)))
 764                       ll)))
 765               (buffer-list)))
 766           (eager desktop-restore-eager)
 767           (buf (get-buffer-create "*desktop*")))
 768       (set-buffer buf)
 769       (erase-buffer)
 770
 771       (insert
 772         ";; -*- mode: emacs-lisp; coding: emacs-mule; -*-\n"
 773         desktop-header
 774         ";; Created " (current-time-string) "\n"
 775         ";; Desktop file format version " desktop-file-version "\n"
 776         ";; Emacs version " emacs-version "\n\n"
 777         ";; Global section:\n")
 778       (mapc (function desktop-outvar) desktop-globals-to-save)
 779       (if (memq 'kill-ring desktop-globals-to-save)
 780         (insert
 781           "(setq kill-ring-yank-pointer (nthcdr "
 782           (int-to-string (- (length kill-ring) (length kill-ring-yank-pointer)))
 783           " kill-ring))\n"))
 784
 785       (insert "\n;; Buffer section -- buffers listed in same order as in buffer list:\n")
 786       (mapc #'(lambda (l)
 787                 (when (apply 'desktop-save-buffer-p l)
 788                   (insert "("
 789                           (if (or (not (integerp eager))
 790                                   (unless (zerop eager)
 791                                     (setq eager (1- eager))
 792                                     t))
 793                               "desktop-create-buffer"
 794                             "desktop-append-buffer-args")
 795                           " "
 796                           desktop-file-version)
 797                   (mapc #'(lambda (e)
 798                             (insert "\n  " (desktop-value-to-string e)))
 799                         l)
 800                   (insert ")\n\n")))
 801             info)
 802       (setq default-directory dirname)
 803       (let ((coding-system-for-write 'emacs-mule))
 804         (write-region (point-min) (point-max) filename nil 'nomessage))))
 805   (setq desktop-dirname dirname))
 806
 807 ;; ----------------------------------------------------------------------------
 808 (defun desktop-remove ()
 809   "Delete desktop file in `desktop-dirname'.
 810 This function also sets `desktop-dirname' to nil."
 811   (interactive)
 812   (when desktop-dirname
 813     (let ((filename (expand-file-name desktop-base-file-name desktop-dirname)))
 814       (setq desktop-dirname nil)
 815       (when (file-exists-p filename)
 816         (delete-file filename)))))
 817
 818 (defvar desktop-buffer-args-list nil
 819   "List of args for `desktop-create-buffer'.")
 820
 821 (defvar desktop-lazy-timer nil)
 822
 823 ;; ----------------------------------------------------------------------------
 824 ;;;###autoload
 825 (defun desktop-read (&optional dirname)
 826   "Read and process the desktop file in directory DIRNAME.
 827 Look for a desktop file in DIRNAME, or if DIRNAME is omitted, look in
 828 directories listed in `desktop-path'.  If a desktop file is found, it
 829 is processed and `desktop-after-read-hook' is run.  If no desktop file
 830 is found, clear the desktop and run `desktop-no-desktop-file-hook'.
 831 This function is a no-op when Emacs is running in batch mode.
 832 It returns t if a desktop file was loaded, nil otherwise."
 833   (interactive)
 834   (unless noninteractive
 835     (setq desktop-dirname
 836       (file-name-as-directory
 837         (expand-file-name
 838           (or
 839             ;; If DIRNAME is specified, use it.
 840             (and (< 0 (length dirname)) dirname)
 841             ;; Otherwise search desktop file in desktop-path.
 842             (let ((dirs desktop-path))
 843               (while
 844                 (and
 845                   dirs
 846                   (not
 847                     (file-exists-p (expand-file-name desktop-base-file-name (car dirs)))))
 848                 (setq dirs (cdr dirs)))
 849               (and dirs (car dirs)))
 850             ;; If not found and `desktop-path' is non-nil, use its first element.
 851             (and desktop-path (car desktop-path))
 852             ;; Default: Home directory.
 853             "~"))))
 854     (if (file-exists-p (expand-file-name desktop-base-file-name desktop-dirname))
 855       ;; Desktop file found, process it.
 856       (let ((desktop-first-buffer nil)
 857             (desktop-buffer-ok-count 0)
 858             (desktop-buffer-fail-count 0))
 859         (setq desktop-lazy-timer nil)
 860         ;; Evaluate desktop buffer.
 861         (load (expand-file-name desktop-base-file-name desktop-dirname) t t t)
 862         ;; `desktop-create-buffer' puts buffers at end of the buffer list.
 863         ;; We want buffers existing prior to evaluating the desktop (and not reused)
 864         ;; to be placed at the end of the buffer list, so we move them here.
 865         (mapc 'bury-buffer
 866               (nreverse (cdr (memq desktop-first-buffer (nreverse (buffer-list))))))
 867         (switch-to-buffer (car (buffer-list)))
 868         (run-hooks 'desktop-delay-hook)
 869         (setq desktop-delay-hook nil)
 870         (run-hooks 'desktop-after-read-hook)
 871         (message "Desktop: %d buffer%s restored%s%s."
 872                  desktop-buffer-ok-count
 873                  (if (= 1 desktop-buffer-ok-count) "" "s")
 874                  (if (< 0 desktop-buffer-fail-count)
 875                      (format ", %d failed to restore" desktop-buffer-fail-count)
 876                    "")
 877                  (if desktop-buffer-args-list
 878                      (format ", %d to restore lazily"
 879                              (length desktop-buffer-args-list))
 880                    ""))
 881         t)
 882       ;; No desktop file found.
 883       (desktop-clear)
 884       (let ((default-directory desktop-dirname))
 885         (run-hooks 'desktop-no-desktop-file-hook))
 886       (message "No desktop file.")
 887       nil)))
 888
 889 ;; ----------------------------------------------------------------------------
 890 ;; Maintained for backward compatibility
 891 ;;;###autoload
 892 (defun desktop-load-default ()
 893   "Load the `default' start-up library manually.
 894 Also inhibit further loading of it."
 895   (unless inhibit-default-init          ; safety check
 896     (load "default" t t)
 897     (setq inhibit-default-init t)))
 898 (make-obsolete 'desktop-load-default
 899                'desktop-save-mode "22.1")
 900
 901 ;; ----------------------------------------------------------------------------
 902 ;;;###autoload
 903 (defun desktop-change-dir (dirname)
 904   "Change to desktop saved in DIRNAME.
 905 Kill the desktop as specified by variables `desktop-save-mode' and
 906 `desktop-save', then clear the desktop and load the desktop file in
 907 directory DIRNAME."
 908   (interactive "DChange to directory: ")
 909   (setq dirname (file-name-as-directory (expand-file-name dirname desktop-dirname)))
 910   (desktop-kill)
 911   (desktop-clear)
 912   (desktop-read dirname))
 913
 914 ;; ----------------------------------------------------------------------------
 915 ;;;###autoload
 916 (defun desktop-save-in-desktop-dir ()
 917   "Save the desktop in directory `desktop-dirname'."
 918   (interactive)
 919   (if desktop-dirname
 920       (desktop-save desktop-dirname)
 921     (call-interactively 'desktop-save))
 922   (message "Desktop saved in %s" desktop-dirname))
 923
 924 ;; ----------------------------------------------------------------------------
 925 ;;;###autoload
 926 (defun desktop-revert ()
 927   "Revert to the last loaded desktop."
 928   (interactive)
 929   (unless desktop-dirname
 930     (error "Unknown desktop directory"))
 931   (unless (file-exists-p (expand-file-name desktop-base-file-name desktop-dirname))
 932     (error "No desktop file found"))
 933   (desktop-clear)
 934   (desktop-read desktop-dirname))
 935
 936 ;; ----------------------------------------------------------------------------
 937 (defun desktop-restore-file-buffer (desktop-buffer-file-name
 938                                     desktop-buffer-name
 939                                     desktop-buffer-misc)
 940   "Restore a file buffer."
 941   (eval-when-compile ; Just to silence the byte compiler
 942     (defvar desktop-buffer-major-mode)
 943     (defvar desktop-buffer-locals))
 944   (if desktop-buffer-file-name
 945       (if (or (file-exists-p desktop-buffer-file-name)
 946               (let ((msg (format "Desktop: File \"%s\" no longer exists."
 947                                  desktop-buffer-file-name)))
 948                  (if desktop-missing-file-warning
 949                      (y-or-n-p (concat msg " Re-create? "))
 950                    (message "%s" msg)
 951                    nil)))
 952           (let* ((auto-insert nil) ; Disable auto insertion
 953                  (coding-system-for-read
 954                   (or coding-system-for-read
 955                       (cdr (assq 'buffer-file-coding-system
 956                                  desktop-buffer-locals))))
 957                  (buf (find-file-noselect desktop-buffer-file-name)))
 958             (condition-case nil
 959                 (switch-to-buffer buf)
 960               (error (pop-to-buffer buf)))
 961             (and (not (eq major-mode desktop-buffer-major-mode))
 962                  (functionp desktop-buffer-major-mode)
 963                  (funcall desktop-buffer-major-mode))
 964             buf)
 965         nil)))
 966
 967 (defun desktop-load-file (function)
 968   "Load the file where auto loaded FUNCTION is defined."
 969   (when function
 970     (let ((fcell (and (fboundp function) (symbol-function function))))
 971       (when (and (listp fcell)
 972                  (eq 'autoload (car fcell)))
 973         (load (cadr fcell))))))
 974
 975 ;; ----------------------------------------------------------------------------
 976 ;; Create a buffer, load its file, set its mode, ...;
 977 ;; called from Desktop file only.
 978
 979 ;; Just to silence the byte compiler.
 980 (eval-when-compile
 981   (defvar desktop-first-buffer)) ; Dynamically bound in `desktop-read'
 982
 983 (defun desktop-create-buffer
 984   (desktop-file-version
 985    desktop-buffer-file-name
 986    desktop-buffer-name
 987    desktop-buffer-major-mode
 988    desktop-buffer-minor-modes
 989    desktop-buffer-point
 990    desktop-buffer-mark
 991    desktop-buffer-read-only
 992    desktop-buffer-misc
 993    &optional
 994    desktop-buffer-locals)
 995   ;; Just to silence the byte compiler. Bound locally in `desktop-read'.
 996   (eval-when-compile
 997     (defvar desktop-buffer-ok-count)
 998     (defvar desktop-buffer-fail-count))
 999   ;; To make desktop files with relative file names possible, we cannot
1000   ;; allow `default-directory' to change. Therefore we save current buffer.
1001   (save-current-buffer
1002     ;; Give major mode module a chance to add a handler.
1003     (desktop-load-file desktop-buffer-major-mode)
1004     (let ((buffer-list (buffer-list))
1005           (result
1006            (condition-case err
1007                (funcall (or (cdr (assq desktop-buffer-major-mode
1008                                        desktop-buffer-mode-handlers))
1009                             'desktop-restore-file-buffer)
1010                         desktop-buffer-file-name
1011                         desktop-buffer-name
1012                         desktop-buffer-misc)
1013              (error
1014               (message "Desktop: Can't load buffer %s: %s"
1015                        desktop-buffer-name
1016                        (error-message-string err))
1017               (when desktop-missing-file-warning (sit-for 1))
1018               nil))))
1019       (if (bufferp result)
1020           (setq desktop-buffer-ok-count (1+ desktop-buffer-ok-count))
1021         (setq desktop-buffer-fail-count (1+ desktop-buffer-fail-count))
1022         (setq result nil))
1023       ;; Restore buffer list order with new buffer at end. Don't change
1024       ;; the order for old desktop files (old desktop module behaviour).
1025       (unless (< desktop-file-version 206)
1026         (mapc 'bury-buffer buffer-list)
1027         (when result (bury-buffer result)))
1028       (when result
1029         (unless (or desktop-first-buffer (< desktop-file-version 206))
1030           (setq desktop-first-buffer result))
1031         (set-buffer result)
1032         (unless (equal (buffer-name) desktop-buffer-name)
1033           (rename-buffer desktop-buffer-name))
1034         ;; minor modes
1035         (cond ((equal '(t) desktop-buffer-minor-modes) ; backwards compatible
1036                (auto-fill-mode 1))
1037               ((equal '(nil) desktop-buffer-minor-modes) ; backwards compatible
1038                (auto-fill-mode 0))
1039               (t
1040                (mapc #'(lambda (minor-mode)
1041                          ;; Give minor mode module a chance to add a handler.
1042                          (desktop-load-file minor-mode)
1043                          (let ((handler (cdr (assq minor-mode desktop-minor-mode-handlers))))
1044                            (if handler
1045                                (funcall handler desktop-buffer-locals)
1046                              (when (functionp minor-mode)
1047                                (funcall minor-mode 1)))))
1048                      desktop-buffer-minor-modes)))
1049         ;; Even though point and mark are non-nil when written by `desktop-save',
1050         ;; they may be modified by handlers wanting to set point or mark themselves.
1051         (when desktop-buffer-point
1052           (goto-char
1053             (condition-case err
1054                 ;; Evaluate point. Thus point can be something like '(search-forward ...
1055                 (eval desktop-buffer-point)
1056               (error (message "%s" (error-message-string err)) 1))))
1057         (when desktop-buffer-mark
1058           (if (consp desktop-buffer-mark)
1059             (progn
1060               (set-mark (car desktop-buffer-mark))
1061               (setq mark-active (car (cdr desktop-buffer-mark))))
1062             (set-mark desktop-buffer-mark)))
1063         ;; Never override file system if the file really is read-only marked.
1064         (if desktop-buffer-read-only (setq buffer-read-only desktop-buffer-read-only))
1065         (while desktop-buffer-locals
1066           (let ((this (car desktop-buffer-locals)))
1067             (if (consp this)
1068               ;; an entry of this form `(symbol . value)'
1069               (progn
1070                 (make-local-variable (car this))
1071                 (set (car this) (cdr this)))
1072               ;; an entry of the form `symbol'
1073               (make-local-variable this)
1074               (makunbound this)))
1075           (setq desktop-buffer-locals (cdr desktop-buffer-locals)))))))
1076
1077 ;; ----------------------------------------------------------------------------
1078 ;; Backward compatibility -- update parameters to 205 standards.
1079 (defun desktop-buffer (desktop-buffer-file-name desktop-buffer-name
1080                        desktop-buffer-major-mode
1081                        mim pt mk ro tl fc cfs cr desktop-buffer-misc)
1082   (desktop-create-buffer 205 desktop-buffer-file-name desktop-buffer-name
1083                          desktop-buffer-major-mode (cdr mim) pt mk ro
1084                          desktop-buffer-misc
1085                          (list (cons 'truncate-lines tl)
1086                                (cons 'fill-column fc)
1087                                (cons 'case-fold-search cfs)
1088                                (cons 'case-replace cr)
1089                                (cons 'overwrite-mode (car mim)))))
1090
1091 (defun desktop-append-buffer-args (&rest args)
1092   "Append ARGS at end of `desktop-buffer-args-list'.
1093 ARGS must be an argument list for `desktop-create-buffer'."
1094   (setq desktop-buffer-args-list (nconc desktop-buffer-args-list (list args)))
1095   (unless desktop-lazy-timer
1096     (setq desktop-lazy-timer
1097           (run-with-idle-timer desktop-lazy-idle-delay t 'desktop-idle-create-buffers))))
1098
1099 (defun desktop-lazy-create-buffer ()
1100   "Pop args from `desktop-buffer-args-list', create buffer and bury it."
1101   (when desktop-buffer-args-list
1102     (let* ((remaining (length desktop-buffer-args-list))
1103            (args (pop desktop-buffer-args-list))
1104            (buffer-name (nth 2 args))
1105            (msg (format "Desktop lazily opening %s (%s remaining)..."
1106                             buffer-name remaining)))
1107       (when desktop-lazy-verbose
1108         (message "%s" msg))
1109       (let ((desktop-first-buffer nil)
1110             (desktop-buffer-ok-count 0)
1111             (desktop-buffer-fail-count 0))
1112         (apply 'desktop-create-buffer args)
1113         (run-hooks 'desktop-delay-hook)
1114         (setq desktop-delay-hook nil)
1115         (bury-buffer (get-buffer buffer-name))
1116         (when desktop-lazy-verbose
1117           (message "%s%s" msg (if (> desktop-buffer-ok-count 0) "done" "failed")))))))
1118
1119 (defun desktop-idle-create-buffers ()
1120   "Create buffers until the user does something, then stop.
1121 If there are no buffers left to create, kill the timer."
1122   (let ((repeat 1))
1123     (while (and repeat desktop-buffer-args-list)
1124       (save-window-excursion
1125         (desktop-lazy-create-buffer))
1126       (setq repeat (sit-for 0.2))
1127     (unless desktop-buffer-args-list
1128       (cancel-timer desktop-lazy-timer)
1129       (setq desktop-lazy-timer nil)
1130       (message "Lazy desktop load complete")
1131       (sit-for 3)
1132       (message "")))))
1133
1134 (defun desktop-lazy-complete ()
1135   "Run the desktop load to completion."
1136   (interactive)
1137   (let ((desktop-lazy-verbose t))
1138     (while desktop-buffer-args-list
1139       (save-window-excursion
1140         (desktop-lazy-create-buffer)))
1141     (message "Lazy desktop load complete")))
1142
1143 (defun desktop-lazy-abort ()
1144   "Abort lazy loading of the desktop."
1145   (interactive)
1146   (when desktop-lazy-timer
1147     (cancel-timer desktop-lazy-timer)
1148     (setq desktop-lazy-timer nil))
1149   (when desktop-buffer-args-list
1150     (setq desktop-buffer-args-list nil)
1151     (when (interactive-p)
1152       (message "Lazy desktop load aborted"))))
1153
1154 ;; ----------------------------------------------------------------------------
1155 ;; When `desktop-save-mode' is non-nil and "--no-desktop" is not specified on the
1156 ;; command line, we do the rest of what it takes to use desktop, but do it
1157 ;; after finishing loading the init file.
1158 ;; We cannot use `command-switch-alist' to process "--no-desktop" because these
1159 ;; functions are processed after `after-init-hook'.
1160 (add-hook
1161   'after-init-hook
1162   '(lambda ()
1163     (let ((key "--no-desktop"))
1164       (when (member key command-line-args)
1165         (setq command-line-args (delete key command-line-args))
1166         (setq desktop-save-mode nil)))
1167     (when desktop-save-mode (desktop-read))))
1168
1169 (provide 'desktop)
1170
1171 ;;; arch-tag: 221907c3-1771-4fd3-9c2e-c6f700c6ede9
1172 ;;; desktop.el ends here