desktop.el 48.5 KB
Newer Older
Richard M. Stallman's avatar
Richard M. Stallman committed
1 2
;;; desktop.el --- save partial status of Emacs when killed

3
;; Copyright (C) 1993, 1994, 1995, 1997, 2000, 2001, 2002, 2003,
Glenn Morris's avatar
Glenn Morris committed
4
;;   2004, 2005, 2006, 2007, 2008 Free Software Foundation, Inc.
Richard M. Stallman's avatar
Richard M. Stallman committed
5 6

;; Author: Morten Welinder <terra@diku.dk>
Dave Love's avatar
Dave Love committed
7
;; Keywords: convenience
Richard M. Stallman's avatar
Richard M. Stallman committed
8
;; Favourite-brand-of-beer: None, I hate beer.
Richard M. Stallman's avatar
Richard M. Stallman committed
9 10 11 12 13

;; 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
14
;; the Free Software Foundation; either version 3, or (at your option)
Richard M. Stallman's avatar
Richard M. Stallman committed
15 16 17 18 19 20 21 22
;; 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
Erik Naggum's avatar
Erik Naggum committed
23
;; along with GNU Emacs; see the file COPYING.  If not, write to the
Lute Kamstra's avatar
Lute Kamstra committed
24 25
;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
;; Boston, MA 02110-1301, USA.
Richard M. Stallman's avatar
Richard M. Stallman committed
26 27 28

;;; Commentary:

29 30 31 32 33 34 35 36
;; 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
37
;;		- some local variables
Richard M. Stallman's avatar
Richard M. Stallman committed
38

Kenichi Handa's avatar
Kenichi Handa committed
39 40
;; To use this, use customize to turn on desktop-save-mode or add the
;; following line somewhere in your .emacs file:
41
;;
Kenichi Handa's avatar
Kenichi Handa committed
42
;;	(desktop-save-mode 1)
43
;;
Kenichi Handa's avatar
Kenichi Handa committed
44 45 46 47
;; For further usage information, look at the section
;; "Saving Emacs Sessions" in the GNU Emacs Manual.

;; When the desktop module is loaded, the function `desktop-kill' is
48
;; added to the `kill-emacs-hook'.  This function is responsible for
Kenichi Handa's avatar
Kenichi Handa committed
49
;; saving the desktop when Emacs is killed.  Furthermore an anonymous
50
;; function is added to the `after-init-hook'.  This function is
Kenichi Handa's avatar
Kenichi Handa committed
51
;; responsible for loading the desktop when Emacs is started.
52

53 54 55 56 57
;; Special handling.
;; -----------------
;; Variables `desktop-buffer-mode-handlers' and `desktop-minor-mode-handlers'
;; are supplied to handle special major and minor modes respectively.
;; `desktop-buffer-mode-handlers' is an alist of major mode specific functions
58
;; to restore a desktop buffer.  Elements must have the form
59
;;
60
;;    (MAJOR-MODE . RESTORE-BUFFER-FUNCTION).
61
;;
62
;; Functions listed are called by `desktop-create-buffer' when `desktop-read'
63
;; evaluates the desktop file.  Buffers with a major mode not specified here,
64 65 66
;; are restored by the default handler `desktop-restore-file-buffer'.
;; `desktop-minor-mode-handlers' is an alist of functions to restore
;; non-standard minor modes.  Elements must have the form
67
;;
68
;;    (MINOR-MODE . RESTORE-FUNCTION).
69
;;
70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87
;; Functions are called by `desktop-create-buffer' to restore minor modes.
;; Minor modes not specified here, are restored by the standard minor mode
;; function.  If you write a module that defines a major or minor mode that
;; needs a special handler, then place code like

;;    (defun foo-restore-desktop-buffer
;;    ...
;;    (add-to-list 'desktop-buffer-mode-handlers
;;                 '(foo-mode . foo-restore-desktop-buffer))

;; or

;;    (defun bar-desktop-restore
;;    ...
;;    (add-to-list 'desktop-minor-mode-handlers
;;                 '(bar-mode . bar-desktop-restore))

;; in the module itself, and make shure that the mode function is
88
;; autoloaded.  See the docstrings of `desktop-buffer-mode-handlers' and
89 90 91 92 93 94 95 96 97 98 99 100 101 102
;; `desktop-minor-mode-handlers' for more info.

;; Minor modes.
;; ------------
;; Conventional minor modes (see node "Minor Mode Conventions" in the elisp
;; manual) are handled in the following way:
;; When `desktop-save' saves the state of a buffer to the desktop file, it
;; saves as `desktop-minor-modes' the list of names of those variables in
;; `minor-mode-alist' that have a non-nil value.
;; When `desktop-create' restores the buffer, each of the symbols in
;; `desktop-minor-modes' is called as function with parameter 1.
;; The variables `desktop-minor-mode-table' and `desktop-minor-mode-handlers'
;; are used to handle non-conventional minor modes.  `desktop-save' uses
;; `desktop-minor-mode-table' to map minor mode variables to minor mode
103
;; functions before writing `desktop-minor-modes'.  If a minor mode has a
104 105 106 107 108 109 110 111 112
;; variable name that is different form its function name, an entry

;;    (NAME RESTORE-FUNCTION)

;; should be added to `desktop-minor-mode-table'.  If a minor mode should not
;; be restored, RESTORE-FUNCTION should be set to nil.  `desktop-create' uses
;; `desktop-minor-mode-handlers' to lookup minor modes that needs a restore
;; function different from the usual minor mode function.
;; ---------------------------------------------------------------------------
113

114 115 116 117
;; 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.

118 119 120
;; 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.
121

122 123 124 125 126
;; 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.
127
;;            treese@lcs.mit.edu (Win Treese)        for ange-ftp tips.
128
;;            pot@cnuce.cnr.it (Francesco Potorti`)  for misc. tips.
129 130 131 132 133 134
;; ---------------------------------------------------------------------------
;; TODO:
;;
;; Save window configuration.
;; Recognize more minor modes.
;; Save mark rings.
Richard M. Stallman's avatar
Richard M. Stallman committed
135 136 137

;;; Code:

138
(defvar desktop-file-version "206"
Kenichi Handa's avatar
Kenichi Handa committed
139
  "Version number of desktop file format.
140 141 142
Written into the desktop file and used at desktop read to provide
backward compatibility.")

143
;; ----------------------------------------------------------------------------
144 145
;; USER OPTIONS -- settings you might want to play with.
;; ----------------------------------------------------------------------------
146 147 148 149 150

(defgroup desktop nil
  "Save status of Emacs when you exit."
  :group 'frames)

Kenichi Handa's avatar
Kenichi Handa committed
151 152 153 154
;;;###autoload
(define-minor-mode desktop-save-mode
  "Toggle desktop saving mode.
With numeric ARG, turn desktop saving on if ARG is positive, off
155 156 157
otherwise.  If desktop saving is turned on, the state of Emacs is
saved from one session to another.  See variable `desktop-save'
and function `desktop-read' for details."
Kenichi Handa's avatar
Kenichi Handa committed
158 159 160 161
  :global t
  :group 'desktop)

;; Maintained for backward compatibility
162 163
(define-obsolete-variable-alias 'desktop-enable
                                'desktop-save-mode "22.1")
164

165 166 167 168
(defun desktop-save-mode-off ()
  "Disable `desktop-save-mode'.  Provided for use in hooks."
  (desktop-save-mode 0))

169
(defcustom desktop-save 'ask-if-new
Kenichi Handa's avatar
Kenichi Handa committed
170 171 172
  "*Specifies whether the desktop should be saved when it is killed.
A desktop is killed when the user changes desktop or quits Emacs.
Possible values are:
173 174 175 176 177 178
   t             -- always save.
   ask           -- always ask.
   ask-if-new    -- ask if no desktop file exists, otherwise just save.
   ask-if-exists -- ask if desktop file exists, otherwise don't save.
   if-exists     -- save if desktop file exists, otherwise don't save.
   nil           -- never save.
Kenichi Handa's avatar
Kenichi Handa committed
179
The desktop is never saved when `desktop-save-mode' is nil.
180
The variables `desktop-dirname' and `desktop-base-file-name'
Kenichi Handa's avatar
Kenichi Handa committed
181
determine where the desktop is saved."
182 183
  :type
  '(choice
184 185 186 187 188 189
    (const :tag "Always save" t)
    (const :tag "Always ask" ask)
    (const :tag "Ask if desktop file is new, else do save" ask-if-new)
    (const :tag "Ask if desktop file exists, else don't save" ask-if-exists)
    (const :tag "Save if desktop file exists, else don't" if-exists)
    (const :tag "Never save" nil))
190
  :group 'desktop
191
  :version "22.1")
192

193 194 195 196 197 198 199 200 201 202 203 204 205 206
(defcustom desktop-load-locked-desktop 'ask
  "Specifies whether the desktop should be loaded if locked.
Possible values are:
   t    -- load anyway.
   nil  -- don't load.
   ask  -- ask the user.
If the value is nil, or `ask' and the user chooses not to load the desktop,
the normal hook `desktop-not-loaded-hook' is run."
  :type
  '(choice
    (const :tag "Load anyway" t)
    (const :tag "Don't load" nil)
    (const :tag "Ask the user" ask))
  :group 'desktop
207
  :version "22.2")
208

209 210 211
(define-obsolete-variable-alias 'desktop-basefilename
                                'desktop-base-file-name "22.1")

212
(defcustom desktop-base-file-name
213
  (convert-standard-filename ".emacs.desktop")
Kenichi Handa's avatar
Kenichi Handa committed
214
  "Name of file for Emacs desktop, excluding the directory part."
215 216
  :type 'file
  :group 'desktop)
Richard M. Stallman's avatar
Richard M. Stallman committed
217

218 219 220 221 222
(defcustom desktop-base-lock-name
  (convert-standard-filename ".emacs.desktop.lock")
  "Name of lock file for Emacs desktop, excluding the directory part."
  :type 'file
  :group 'desktop
223
  :version "22.2")
224

225 226 227 228
(defcustom desktop-path '("." "~")
  "List of directories to search for the desktop file.
The base name of the file is specified in `desktop-base-file-name'."
  :type '(repeat directory)
229
  :group 'desktop
230
  :version "22.1")
231

232
(defcustom desktop-missing-file-warning nil
233
  "If non-nil, offer to recreate the buffer of a deleted file.
234 235 236 237
Also pause for a moment to display message about errors signaled in
`desktop-buffer-mode-handlers'.

If nil, just print error messages in the message buffer."
238
  :type 'boolean
239
  :group 'desktop
240
  :version "22.1")
Richard M. Stallman's avatar
Richard M. Stallman committed
241

242
(defcustom desktop-no-desktop-file-hook nil
Kenichi Handa's avatar
Kenichi Handa committed
243
  "Normal hook run when `desktop-read' can't find a desktop file.
244
Run in the directory in which the desktop file was sought.
245
May be used to show a dired buffer."
246
  :type 'hook
247
  :group 'desktop
248
  :version "22.1")
249

250 251 252 253 254 255 256
(defcustom desktop-not-loaded-hook nil
  "Normal hook run when the user declines to re-use a desktop file.
Run in the directory in which the desktop file was found.
May be used to deal with accidental multiple Emacs jobs."
  :type 'hook
  :group 'desktop
  :options '(desktop-save-mode-off save-buffers-kill-emacs)
257
  :version "22.2")
258

259
(defcustom desktop-after-read-hook nil
Kenichi Handa's avatar
Kenichi Handa committed
260
  "Normal hook run after a successful `desktop-read'.
261
May be used to show a buffer list."
262
  :type 'hook
263
  :group 'desktop
264
  :options '(list-buffers)
265
  :version "22.1")
266 267

(defcustom desktop-save-hook nil
Kenichi Handa's avatar
Kenichi Handa committed
268
  "Normal hook run before the desktop is saved in a desktop file.
269 270 271
Run with the desktop buffer current with only the header present.
May be used to add to the desktop code or to truncate history lists,
for example."
272 273 274
  :type 'hook
  :group 'desktop)

275 276 277 278 279 280 281
(defcustom desktop-globals-to-save
  '(desktop-missing-file-warning
    tags-file-name
    tags-table-list
    search-ring
    regexp-search-ring
    register-alist)
Kenichi Handa's avatar
Kenichi Handa committed
282 283 284 285
  "List of global variables saved by `desktop-save'.
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.
286 287 288 289
Feature: Saving `kill-ring' implies saving `kill-ring-yank-pointer'."
  :type '(repeat (restricted-sexp :match-alternatives (symbolp consp)))
  :group 'desktop)

290 291 292 293 294 295 296
(defcustom desktop-globals-to-clear
  '(kill-ring
    kill-ring-yank-pointer
    search-ring
    search-ring-yank-pointer
    regexp-search-ring
    regexp-search-ring-yank-pointer)
297
  "List of global variables that `desktop-clear' will clear.
298
An element may be variable name (a symbol) or a cons cell of the form
299 300
\(VAR . FORM).  Symbols are set to nil and for cons cells VAR is set
to the value obtained by evaluating FORM."
301
  :type '(repeat (restricted-sexp :match-alternatives (symbolp consp)))
302
  :group 'desktop
303
  :version "22.1")
304

305 306 307 308 309
(defcustom desktop-clear-preserve-buffers
  '("\\*scratch\\*" "\\*Messages\\*" "\\*server\\*" "\\*tramp/.+\\*")
  "*List of buffers that `desktop-clear' should not delete.
Each element is a regular expression.  Buffers with a name matched by any of
these won't be deleted."
310 311
  :type '(repeat string)
  :group 'desktop)
312

313
;;;###autoload
314 315 316 317 318 319 320 321 322
(defcustom desktop-locals-to-save
  '(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
323 324 325 326
    column-number-mode
    size-indication-mode
    buffer-file-coding-system
    indent-tabs-mode
327
    tab-width
328 329 330
    indicate-buffer-boundaries
    indicate-empty-lines
    show-trailing-whitespace)
Richard M. Stallman's avatar
Richard M. Stallman committed
331
  "List of local variables to save for each buffer.
332 333
The variables are saved only when they really are local.  Conventional minor
modes are restored automatically; they should not be listed here."
Kenichi Handa's avatar
Kenichi Handa committed
334 335
  :type '(repeat symbol)
  :group 'desktop)
336

337
;; We skip .log files because they are normally temporary.
Karl Heuer's avatar
Karl Heuer committed
338
;;         (ftp) files because they require passwords and whatnot.
339
(defcustom desktop-buffers-not-to-save
340
  "\\(^nn\\.a[0-9]+\\|\\.log\\|(ftp)\\)$"
341 342 343
  "Regexp identifying buffers that are to be excluded from saving."
  :type 'regexp
  :group 'desktop)
Richard M. Stallman's avatar
Richard M. Stallman committed
344

Kenichi Handa's avatar
Kenichi Handa committed
345
;; Skip tramp and ange-ftp files
346
(defcustom desktop-files-not-to-save
347
  "^/[^/:]*:"
348 349 350
  "Regexp identifying files whose buffers are to be excluded from saving."
  :type 'regexp
  :group 'desktop)
351

352 353 354
;; We skip TAGS files to save time (tags-file-name is saved instead).
(defcustom desktop-modes-not-to-save
  '(tags-table-mode)
355 356 357 358
  "List of major modes whose buffers should not be saved."
  :type '(repeat symbol)
  :group 'desktop)

359 360 361 362 363 364 365
(defcustom desktop-file-name-format 'absolute
  "*Format in which desktop file names should be saved.
Possible values are:
   absolute -- Absolute file name.
   tilde    -- Relative to ~.
   local    -- Relative to directory of desktop file."
  :type '(choice (const absolute) (const tilde) (const local))
366
  :group 'desktop
367
  :version "22.1")
368

369 370 371 372
(defcustom desktop-restore-eager t
  "Number of buffers to restore immediately.
Remaining buffers are restored lazily (when Emacs is idle).
If value is t, all buffers are restored immediately."
373
  :type '(choice (const t) integer)
374
  :group 'desktop
375
  :version "22.1")
376 377 378 379 380

(defcustom desktop-lazy-verbose t
  "Verbose reporting of lazily created buffers."
  :type 'boolean
  :group 'desktop
381
  :version "22.1")
382 383 384 385 386 387

(defcustom desktop-lazy-idle-delay 5
  "Idle delay before starting to create buffers.
See `desktop-restore-eager'."
  :type 'integer
  :group 'desktop
388
  :version "22.1")
389

390
;;;###autoload
391 392
(defvar desktop-save-buffer nil
  "When non-nil, save buffer status in desktop file.
393
This variable becomes buffer local when set.
394

395 396
If the value is a function, it is called by `desktop-save' with argument
DESKTOP-DIRNAME to obtain auxiliary information to save in the desktop
397
file along with the state of the buffer for which it was called.
398

Kenichi Handa's avatar
Kenichi Handa committed
399
When file names are returned, they should be formatted using the call
400
\"(desktop-file-name FILE-NAME DESKTOP-DIRNAME)\".
401

402 403 404
Later, when `desktop-read' evaluates the desktop file, auxiliary information
is passed as the argument DESKTOP-BUFFER-MISC to functions in
`desktop-buffer-mode-handlers'.")
405 406
(make-variable-buffer-local 'desktop-save-buffer)
(make-obsolete-variable 'desktop-buffer-modes-to-save
407
                        'desktop-save-buffer "22.1")
408
(make-obsolete-variable 'desktop-buffer-misc-functions
409
                        'desktop-save-buffer "22.1")
410

411 412 413
;;;###autoload
(defvar desktop-buffer-mode-handlers
  nil
414
  "Alist of major mode specific functions to restore a desktop buffer.
415 416 417 418
Functions listed are called by `desktop-create-buffer' when `desktop-read'
evaluates the desktop file.  List elements must have the form

   (MAJOR-MODE . RESTORE-BUFFER-FUNCTION).
419 420 421 422

Buffers with a major mode not specified here, are restored by the default
handler `desktop-restore-file-buffer'.

423
Handlers are called with argument list
424

425
   (DESKTOP-BUFFER-FILE-NAME DESKTOP-BUFFER-NAME DESKTOP-BUFFER-MISC)
426 427

Furthermore, they may use the following variables:
428 429 430 431 432 433 434 435 436

   desktop-file-version
   desktop-buffer-major-mode
   desktop-buffer-minor-modes
   desktop-buffer-point
   desktop-buffer-mark
   desktop-buffer-read-only
   desktop-buffer-locals

437
If a handler returns a buffer, then the saved mode settings
438 439 440 441
and variable values for that buffer are copied into it.

Modules that define a major mode that needs a special handler should contain
code like
442

443 444 445 446 447 448
   (defun foo-restore-desktop-buffer
   ...
   (add-to-list 'desktop-buffer-mode-handlers
                '(foo-mode . foo-restore-desktop-buffer))

Furthermore the major mode function must be autoloaded.")
449

450
;;;###autoload
451 452
(put 'desktop-buffer-mode-handlers 'risky-local-variable t)
(make-obsolete-variable 'desktop-buffer-handlers
453
                        'desktop-buffer-mode-handlers "22.1")
454

455 456
(defcustom desktop-minor-mode-table
  '((auto-fill-function auto-fill-mode)
457
    (vc-mode nil)
458 459
    (vc-dired-mode nil)
    (erc-track-minor-mode nil))
460 461 462 463
  "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.
464
RESTORE-FUNCTION nil means don't try to restore the minor mode.
465
Only minor modes for which the name of the buffer-local variable
466
and the name of the minor mode function are different have to be added to
467
this table.  See also `desktop-minor-mode-handlers'."
468 469 470
  :type 'sexp
  :group 'desktop)

471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514
;;;###autoload
(defvar desktop-minor-mode-handlers
  nil
  "Alist of functions to restore non-standard minor modes.
Functions are called by `desktop-create-buffer' to restore minor modes.
List elements must have the form

   (MINOR-MODE . RESTORE-FUNCTION).

Minor modes not specified here, are restored by the standard minor mode
function.

Handlers are called with argument list

   (DESKTOP-BUFFER-LOCALS)

Furthermore, they may use the following variables:

   desktop-file-version
   desktop-buffer-file-name
   desktop-buffer-name
   desktop-buffer-major-mode
   desktop-buffer-minor-modes
   desktop-buffer-point
   desktop-buffer-mark
   desktop-buffer-read-only
   desktop-buffer-misc

When a handler is called, the buffer has been created and the major mode has
been set, but local variables listed in desktop-buffer-locals has not yet been
created and set.

Modules that define a minor mode that needs a special handler should contain
code like

   (defun foo-desktop-restore
   ...
   (add-to-list 'desktop-minor-mode-handlers
                '(foo-mode . foo-desktop-restore))

Furthermore the minor mode function must be autoloaded.

See also `desktop-minor-mode-table'.")

515
;;;###autoload
516 517
(put 'desktop-minor-mode-handlers 'risky-local-variable t)

518 519
;; ----------------------------------------------------------------------------
(defvar desktop-dirname nil
Kenichi Handa's avatar
Kenichi Handa committed
520
  "The directory in which the desktop file should be saved.")
Richard M. Stallman's avatar
Richard M. Stallman committed
521

522 523 524 525 526
(defun desktop-full-file-name (&optional dirname)
  "Return the full name of the desktop file in DIRNAME.
DIRNAME omitted or nil means use `desktop-dirname'."
  (expand-file-name desktop-base-file-name (or dirname desktop-dirname)))

527 528 529 530 531
(defun desktop-full-lock-name (&optional dirname)
  "Return the full name of the desktop lock file in DIRNAME.
DIRNAME omitted or nil means use `desktop-dirname'."
  (expand-file-name desktop-base-lock-name (or dirname desktop-dirname)))

Richard M. Stallman's avatar
Richard M. Stallman committed
532
(defconst desktop-header
533 534 535
";; --------------------------------------------------------------------------
;; Desktop File for Emacs
;; --------------------------------------------------------------------------
Richard M. Stallman's avatar
Richard M. Stallman committed
536
" "*Header to place in Desktop file.")
537 538 539

(defvar desktop-delay-hook nil
  "Hooks run after all buffers are loaded; intended for internal use.")
540

541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573
;; ----------------------------------------------------------------------------
;; Desktop file conflict detection
(defvar desktop-file-modtime nil
  "When the desktop file was last modified to the knowledge of this Emacs.
Used to detect desktop file conflicts.")

(defun desktop-owner (&optional dirname)
  "Return the PID of the Emacs process that owns the desktop file in DIRNAME.
Return nil if no desktop file found or no Emacs process is using it.
DIRNAME omitted or nil means use `desktop-dirname'."
  (let (owner)
    (and (file-exists-p (desktop-full-lock-name dirname))
	 (condition-case nil
	     (with-temp-buffer
	       (insert-file-contents-literally (desktop-full-lock-name dirname))
	       (goto-char (point-min))
	       (setq owner (read (current-buffer)))
	       (integerp owner))
	   (error nil))
	 owner)))

(defun desktop-claim-lock (&optional dirname)
  "Record this Emacs process as the owner of the desktop file in DIRNAME.
DIRNAME omitted or nil means use `desktop-dirname'."
  (write-region (number-to-string (emacs-pid)) nil
		(desktop-full-lock-name dirname)))

(defun desktop-release-lock (&optional dirname)
  "Remove the lock file for the desktop in DIRNAME.
DIRNAME omitted or nil means use `desktop-dirname'."
  (let ((file (desktop-full-lock-name dirname)))
    (when (file-exists-p file) (delete-file file))))

574
;; ----------------------------------------------------------------------------
Kenichi Handa's avatar
Kenichi Handa committed
575
(defun desktop-truncate (list n)
576
  "Truncate LIST to at most N elements destructively."
Kenichi Handa's avatar
Kenichi Handa committed
577
  (let ((here (nthcdr (1- n) list)))
578 579
    (when (consp here)
      (setcdr here nil))))
580

581
;; ----------------------------------------------------------------------------
582
;;;###autoload
583 584
(defun desktop-clear ()
  "Empty the Desktop.
585 586 587
This kills all buffers except for internal ones and those with names matched by
a regular expression in the list `desktop-clear-preserve-buffers'.
Furthermore, it clears the variables listed in `desktop-globals-to-clear'."
Richard M. Stallman's avatar
Richard M. Stallman committed
588
  (interactive)
589
  (desktop-lazy-abort)
590 591
  (dolist (var desktop-globals-to-clear)
    (if (symbolp var)
592
	(eval `(setq-default ,var nil))
593
      (eval `(setq-default ,(car var) ,(cdr var)))))
594 595 596 597 598 599 600
  (let ((buffers (buffer-list))
        (preserve-regexp (concat "^\\("
                                 (mapconcat (lambda (regexp)
                                              (concat "\\(" regexp "\\)"))
                                            desktop-clear-preserve-buffers
                                            "\\|")
                                 "\\)$")))
601
    (while buffers
602 603 604
      (let ((bufname (buffer-name (car buffers))))
         (or
           (null bufname)
605
           (string-match preserve-regexp bufname)
606
           ;; Don't kill buffers made for internal purposes.
607
           (and (not (equal bufname "")) (eq (aref bufname 0) ?\s))
608
           (kill-buffer (car buffers))))
609
      (setq buffers (cdr buffers))))
Richard M. Stallman's avatar
Richard M. Stallman committed
610
  (delete-other-windows))
611

612
;; ----------------------------------------------------------------------------
613
(add-hook 'kill-emacs-hook 'desktop-kill)
614

Richard M. Stallman's avatar
Richard M. Stallman committed
615
(defun desktop-kill ()
Kenichi Handa's avatar
Kenichi Handa committed
616
  "If `desktop-save-mode' is non-nil, do what `desktop-save' says to do.
617 618
If the desktop should be saved and `desktop-dirname'
is nil, ask the user where to save the desktop."
619 620 621 622 623 624 625 626
  (when (and desktop-save-mode
             (let ((exists (file-exists-p (desktop-full-file-name))))
               (or (eq desktop-save t)
                   (and exists (memq desktop-save '(ask-if-new if-exists)))
                   (and
                    (or (memq desktop-save '(ask ask-if-new))
                        (and exists (eq desktop-save 'ask-if-exists)))
                    (y-or-n-p "Save desktop? ")))))
627 628
    (unless desktop-dirname
      (setq desktop-dirname
629 630
            (file-name-as-directory
             (expand-file-name
631
	      (read-directory-name "Directory for desktop file: " nil nil t)))))
632
    (condition-case err
633
	(desktop-save desktop-dirname t)
634
      (file-error
635
       (unless (yes-or-no-p "Error while saving the desktop.  Ignore? ")
636 637 638
	 (signal (car err) (cdr err))))))
  ;; If we own it, we don't anymore.
  (when (eq (emacs-pid) (desktop-owner)) (desktop-release-lock)))
639

640
;; ----------------------------------------------------------------------------
641 642 643 644 645 646 647 648 649 650 651
(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)))

652 653 654 655
;; ----------------------------------------------------------------------------
(defun desktop-buffer-info (buffer)
  (set-buffer buffer)
  (list
656 657
   ;; base name of the buffer; replaces the buffer name if managed by uniquify
   (and (fboundp 'uniquify-buffer-base-name) (uniquify-buffer-base-name))
658
   ;; basic information
659
   (desktop-file-name (buffer-file-name) desktop-dirname)
660
   (buffer-name)
661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679
   major-mode
   ;; minor modes
   (let (ret)
     (mapc
      #'(lambda (minor-mode)
	  (and (boundp minor-mode)
	       (symbol-value minor-mode)
	       (let* ((special (assq minor-mode desktop-minor-mode-table))
		      (value (cond (special (cadr special))
				   ((functionp minor-mode) minor-mode))))
		 (when value (add-to-list 'ret value)))))
      (mapcar #'car minor-mode-alist))
     ret)
   ;; point and mark, and read-only status
   (point)
   (list (mark t) mark-active)
   buffer-read-only
   ;; auxiliary information
   (when (functionp desktop-save-buffer)
680
     (funcall desktop-save-buffer desktop-dirname))
681 682 683 684 685 686 687 688 689 690 691 692 693
   ;; local variables
   (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))
	   (when (member (car locals) loclist)
	     (setq ll (cons (car locals) ll)))))
       (setq locals (cdr locals)))
     ll)))

694
;; ----------------------------------------------------------------------------
Kenichi Handa's avatar
Kenichi Handa committed
695
(defun desktop-internal-v2s (value)
Richard M. Stallman's avatar
Richard M. Stallman committed
696 697 698 699
  "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)."
700
  (cond
701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771
    ((or (numberp value) (null value) (eq t value) (keywordp value))
     (cons 'may (prin1-to-string value)))
    ((stringp value)
     (let ((copy (copy-sequence value)))
       (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 value)
     (cons 'must (prin1-to-string value)))
    ((vectorp value)
     (let* ((special nil)
	    (pass1 (mapcar
		    (lambda (el)
		      (let ((res (desktop-internal-v2s el)))
			(if (null (car res))
			    (setq special t))
			res))
		    value)))
       (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 value)
     (let ((p value)
	   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)))
	     (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 value)
     (cons nil (concat "(symbol-function '"
		       (substring (prin1-to-string value) 7 -1)
		       ")")))
    ((markerp value)
     (let ((pos (prin1-to-string (marker-position value)))
	   (buf (prin1-to-string (buffer-name (marker-buffer value)))))
       (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\""))))
772

773
;; ----------------------------------------------------------------------------
Kenichi Handa's avatar
Kenichi Handa committed
774
(defun desktop-value-to-string (value)
Richard M. Stallman's avatar
Richard M. Stallman committed
775 776
  "Convert VALUE to a string that when read evaluates to the same value.
Not all types of values are supported."
777 778
  (let* ((print-escape-newlines t)
	 (float-output-format nil)
Kenichi Handa's avatar
Kenichi Handa committed
779
	 (quote.txt (desktop-internal-v2s value))
780 781 782 783 784
	 (quote (car quote.txt))
	 (txt (cdr quote.txt)))
    (if (eq quote 'must)
	(concat "'" txt)
      txt)))
785

786
;; ----------------------------------------------------------------------------
787 788 789
(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),
790
or a cons cell of the form (VAR . MAX-SIZE),
791 792 793 794 795 796
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))
797 798 799 800 801 802 803 804 805 806
    (when (boundp var)
      (when (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"))))
807

808
;; ----------------------------------------------------------------------------
809
(defun desktop-save-buffer-p (filename bufname mode &rest dummy)
810
  "Return t if buffer should have its state saved in the desktop file.
811
FILENAME is the visited file name, BUFNAME is the buffer name, and
812 813
MODE is the major mode.
\n\(fn FILENAME BUFNAME MODE)"
814
  (let ((case-fold-search nil))
815
    (and (not (string-match desktop-buffers-not-to-save bufname))
816 817 818 819 820 821 822 823 824
         (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)
                  (with-current-buffer bufname
                    (not (string-match desktop-files-not-to-save
                                       default-directory))))
             (and (null filename)
		  (with-current-buffer bufname desktop-save-buffer))))))
825

826
;; ----------------------------------------------------------------------------
827 828 829 830 831 832 833 834 835 836 837 838 839 840
(defun desktop-file-name (filename dirname)
  "Convert FILENAME to format specified in `desktop-file-name-format'.
DIRNAME must be the directory in which the desktop file will be saved."
  (cond
    ((not filename) nil)
    ((eq desktop-file-name-format 'tilde)
     (let ((relative-name (file-relative-name (expand-file-name filename) "~")))
       (cond
         ((file-name-absolute-p relative-name) relative-name)
         ((string= "./" relative-name) "~/")
         ((string= "." relative-name) "~")
         (t (concat "~/" relative-name)))))
    ((eq desktop-file-name-format 'local) (file-relative-name filename dirname))
    (t (expand-file-name filename))))
841

Miles Bader's avatar
Miles Bader committed
842

843
;; ----------------------------------------------------------------------------
844
;;;###autoload
845
(defun desktop-save (dirname &optional release)
Kenichi Handa's avatar
Kenichi Handa committed
846 847
  "Save the desktop in a desktop file.
Parameter DIRNAME specifies where to save the desktop file.
848
Optional parameter RELEASE says whether we're done with this desktop.
Kenichi Handa's avatar
Kenichi Handa committed
849
See also `desktop-base-file-name'."
Richard M. Stallman's avatar
Richard M. Stallman committed
850
  (interactive "DDirectory to save desktop file in: ")
851
  (setq desktop-dirname (file-name-as-directory (expand-file-name dirname)))
Richard M. Stallman's avatar
Richard M. Stallman committed
852
  (save-excursion
853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889
    (let ((eager desktop-restore-eager)
	  (new-modtime (nth 5 (file-attributes (desktop-full-file-name)))))
      (when
	  (or (not new-modtime)		; nothing to overwrite
	      (equal desktop-file-modtime new-modtime)
	      (yes-or-no-p (if desktop-file-modtime
			       (if (> (float-time new-modtime) (float-time desktop-file-modtime))
				   "Desktop file is more recent than the one loaded.  Save anyway? "
				 "Desktop file isn't the one loaded.  Overwrite it? ")
			     "Current desktop was not loaded from a file.  Overwrite this desktop file? "))
	      (unless release (error "Desktop file conflict")))

	;; If we're done with it, release the lock.
	;; Otherwise, claim it if it's unclaimed or if we created it.
	(if release
	    (desktop-release-lock)
	  (unless (and new-modtime (desktop-owner)) (desktop-claim-lock)))

	(with-temp-buffer
	  (insert
	   ";; -*- mode: emacs-lisp; coding: emacs-mule; -*-\n"
	   desktop-header
	   ";; Created " (current-time-string) "\n"
	   ";; Desktop file format version " desktop-file-version "\n"
	   ";; Emacs version " emacs-version "\n")
	  (save-excursion (run-hooks 'desktop-save-hook))
	  (goto-char (point-max))
	  (insert "\n;; Global section:\n")
	  (mapc (function desktop-outvar) desktop-globals-to-save)
	  (when (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 -- buffers listed in same order as in buffer list:\n")
	  (dolist (l (mapcar 'desktop-buffer-info (buffer-list)))
890 891 892 893 894 895 896 897 898 899 900
	    (let ((base (pop l)))
	      (when (apply 'desktop-save-buffer-p l)
		(insert "("
			(if (or (not (integerp eager))
				(if (zerop eager)
				    nil
				  (setq eager (1- eager))))
			    "desktop-create-buffer"
			  "desktop-append-buffer-args")
			" "
			desktop-file-version)
901 902 903
		;; If there's a non-empty base name, we save it instead of the buffer name
		(when (and base (not (string= base "")))
		  (setcar (nthcdr 1 l) base))
904 905 906
		(dolist (e l)
		  (insert "\n  " (desktop-value-to-string e)))
		(insert ")\n\n"))))
907

908
	  (setq default-directory desktop-dirname)
909 910 911 912
	  (let ((coding-system-for-write 'emacs-mule))
	    (write-region (point-min) (point-max) (desktop-full-file-name) nil 'nomessage))
	  ;; We remember when it was modified (which is presumably just now).
	  (setq desktop-file-modtime (nth 5 (file-attributes (desktop-full-file-name)))))))))
913

914
;; ----------------------------------------------------------------------------
915
;;;###autoload
Richard M. Stallman's avatar
Richard M. Stallman committed
916
(defun desktop-remove ()
Kenichi Handa's avatar
Kenichi Handa committed
917 918
  "Delete desktop file in `desktop-dirname'.
This function also sets `desktop-dirname' to nil."
Richard M. Stallman's avatar
Richard M. Stallman committed
919
  (interactive)
Kenichi Handa's avatar
Kenichi Handa committed
920
  (when desktop-dirname
921
    (let ((filename (desktop-full-file-name)))
Kenichi Handa's avatar
Kenichi Handa committed
922 923
      (setq desktop-dirname nil)
      (when (file-exists-p filename)
924
        (delete-file filename)))))
Kenichi Handa's avatar
Kenichi Handa committed
925

926 927 928 929 930
(defvar desktop-buffer-args-list nil
  "List of args for `desktop-create-buffer'.")

(defvar desktop-lazy-timer nil)

931
;; ----------------------------------------------------------------------------
932
;;;###autoload
Kenichi Handa's avatar
Kenichi Handa committed
933 934 935 936
(defun desktop-read (&optional dirname)
  "Read and process the desktop file in directory DIRNAME.
Look for a desktop file in DIRNAME, or if DIRNAME is omitted, look in
directories listed in `desktop-path'.  If a desktop file is found, it
937
is processed and `desktop-after-read-hook' is run.  If no desktop file
Kenichi Handa's avatar
Kenichi Handa committed
938 939 940
is found, clear the desktop and run `desktop-no-desktop-file-hook'.
This function is a no-op when Emacs is running in batch mode.
It returns t if a desktop file was loaded, nil otherwise."
Richard M. Stallman's avatar
Richard M. Stallman committed
941
  (interactive)
942
  (unless noninteractive
Kenichi Handa's avatar
Kenichi Handa committed
943
    (setq desktop-dirname
944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960
          (file-name-as-directory
           (expand-file-name
            (or
             ;; If DIRNAME is specified, use it.
             (and (< 0 (length dirname)) dirname)
             ;; Otherwise search desktop file in desktop-path.
             (let ((dirs desktop-path))
               (while (and dirs
                           (not (file-exists-p
                                 (desktop-full-file-name (car dirs)))))
                 (setq dirs (cdr dirs)))
               (and dirs (car dirs)))
             ;; If not found and `desktop-path' is non-nil, use its first element.
             (and desktop-path (car desktop-path))
             ;; Default: Home directory.
             "~"))))
    (if (file-exists-p (desktop-full-file-name))
961 962 963 964 965 966 967 968
	;; Desktop file found, but is it already in use?
	(let ((desktop-first-buffer nil)
	      (desktop-buffer-ok-count 0)
	      (desktop-buffer-fail-count 0)
	      (owner (desktop-owner))
	      ;; Avoid desktop saving during evaluation of desktop buffer.
	      (desktop-save nil))
	  (if (and owner
969 970 971 972
		   (memq desktop-load-locked-desktop '(nil ask))
		   (or (null desktop-load-locked-desktop)
		       (not (y-or-n-p (format "Warning: desktop file appears to be in use by PID %s.\n\
Using it may cause conflicts.  Use it anyway? " owner)))))
973
	      (let ((default-directory desktop-dirname))
974
		(setq desktop-dirname nil)
975 976 977
		(run-hooks 'desktop-not-loaded-hook)
		(unless desktop-dirname
		  (message "Desktop file in use; not loaded.")))
978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010
	    (desktop-lazy-abort)
	    ;; Evaluate desktop buffer and remember when it was modified.
	    (load (desktop-full-file-name) t t t)
	    (setq desktop-file-modtime (nth 5 (file-attributes (desktop-full-file-name))))
	    ;; If it wasn't already, mark it as in-use, to bother other
	    ;; desktop instances.
	    (unless owner
	      (condition-case nil
		  (desktop-claim-lock)
		(file-error (message "Couldn't record use of desktop file")
			    (sit-for 1))))

	    ;; `desktop-create-buffer' puts buffers at end of the buffer list.
	    ;; We want buffers existing prior to evaluating the desktop (and
	    ;; not reused) to be placed at the end of the buffer list, so we
	    ;; move them here.
	    (mapc 'bury-buffer
		  (nreverse (cdr (memq desktop-first-buffer (nreverse (buffer-list))))))
	    (switch-to-buffer (car (buffer-list)))
	    (run-hooks 'desktop-delay-hook)
	    (setq desktop-delay-hook nil)
	    (run-hooks 'desktop-after-read-hook)
	    (message "Desktop: %d buffer%s restored%s%s."
		     desktop-buffer-ok-count
		     (if (= 1 desktop-buffer-ok-count) "" "s")
		     (if (< 0 desktop-buffer-fail-count)
			 (format ", %d failed to restore" desktop-buffer-fail-count)
		       "")
		     (if desktop-buffer-args-list
			 (format ", %d to restore lazily"
				 (length desktop-buffer-args-list))
		       ""))
	    t))
Kenichi Handa's avatar
Kenichi Handa committed
1011 1012 1013 1014 1015 1016
      ;; No desktop file found.
      (desktop-clear)
      (let ((default-directory desktop-dirname))
        (run-hooks 'desktop-no-desktop-file-hook))
      (message "No desktop file.")
      nil)))
1017

1018
;; ----------------------------------------------------------------------------
Kenichi Handa's avatar
Kenichi Handa committed
1019
;; Maintained for backward compatibility
1020
;;;###autoload
Richard M. Stallman's avatar
Richard M. Stallman committed
1021
(defun desktop-load-default ()
Richard M. Stallman's avatar
Richard M. Stallman committed
1022
  "Load the `default' start-up library manually.
Kenichi Handa's avatar
Kenichi Handa committed
1023
Also inhibit further loading of it."
1024 1025 1026 1027 1028
  (unless inhibit-default-init	        ; safety check
    (load "default" t t)
    (setq inhibit-default-init t)))
(make-obsolete 'desktop-load-default
               'desktop-save-mode "22.1")
1029 1030 1031

;; ----------------------------------------------------------------------------
;;;###autoload
Kenichi Handa's avatar
Kenichi Handa committed
1032 1033 1034 1035 1036 1037 1038
(defun desktop-change-dir (dirname)
  "Change to desktop saved in DIRNAME.
Kill the desktop as specified by variables `desktop-save-mode' and
`desktop-save', then clear the desktop and load the desktop file in
directory DIRNAME."
  (interactive "DChange to directory: ")
  (setq dirname (file-name-as-directory (expand-file-name dirname desktop-dirname)))
1039 1040
  (desktop-kill)
  (desktop-clear)
Kenichi Handa's avatar
Kenichi Handa committed
1041
  (desktop-read dirname))
1042

Kenichi Handa's avatar
Kenichi Handa committed
1043
;; ----------------------------------------------------------------------------
1044
;;;###autoload
Kenichi Handa's avatar
Kenichi Handa committed
1045 1046
(defun desktop-save-in-desktop-dir ()
  "Save the desktop in directory `desktop-dirname'."
1047 1048
  (interactive)
  (if desktop-dirname
1049
      (desktop-save desktop-dirname)
1050 1051 1052 1053 1054 1055 1056 1057
    (call-interactively 'desktop-save))
  (message "Desktop saved in %s" desktop-dirname))

;; ----------------------------------------------------------------------------
;;;###autoload
(defun desktop-revert ()
  "Revert to the last loaded desktop."
  (interactive)
Kenichi Handa's avatar
Kenichi Handa committed
1058 1059
  (unless desktop-dirname
    (error "Unknown desktop directory"))
1060
  (unless (file-exists-p (desktop-full-file-name))
Kenichi Handa's avatar
Kenichi Handa committed
1061 1062 1063
    (error "No desktop file found"))
  (desktop-clear)
  (desktop-read desktop-dirname))
1064

1065 1066
(defvar desktop-buffer-major-mode)
(defvar desktop-buffer-locals)
1067
;; ----------------------------------------------------------------------------
1068 1069 1070 1071
(defun desktop-restore-file-buffer (desktop-buffer-file-name
                                    desktop-buffer-name
                                    desktop-buffer-misc)
  "Restore a file buffer."
1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093
  (when desktop-buffer-file-name
    (if (or (file-exists-p desktop-buffer-file-name)
	    (let ((msg (format "Desktop: File \"%s\" no longer exists."
			       desktop-buffer-file-name)))
	      (if desktop-missing-file-warning
		  (y-or-n-p (concat msg " Re-create buffer? "))
		(message "%s" msg)
		nil)))
	(let* ((auto-insert nil) ; Disable auto insertion
	       (coding-system-for-read
		(or coding-system-for-read
		    (cdr (assq 'buffer-file-coding-system
			       desktop-buffer-locals))))
	       (buf (find-file-noselect desktop-buffer-file-name)))
	  (condition-case nil
	      (switch-to-buffer buf)
	    (error (pop-to-buffer buf)))
	  (and (not (eq major-mode desktop-buffer-major-mode))
	       (functionp desktop-buffer-major-mode)
	       (funcall desktop-buffer-major-mode))
	  buf)
      nil)))
1094

1095 1096
(defun desktop-load-file (function)
  "Load the file where auto loaded FUNCTION is defined."
1097
  (when function
1098
    (let ((fcell (and (fboundp function) (symbol-function function))))
1099 1100 1101
      (when (and (listp fcell)
                 (eq 'autoload (car fcell)))
        (load (cadr fcell))))))
1102

1103
;; ----------------------------------------------------------------------------
Juri Linkov's avatar
Juri Linkov committed
1104 1105
;; Create a buffer, load its file, set its mode, ...;
;; called from Desktop file only.
1106