server.el 21.3 KB
Newer Older
1
;;; server.el --- Lisp code for GNU Emacs running as server process
Eric S. Raymond's avatar
Eric S. Raymond committed
2

3
;; Copyright (C) 1986, 87, 92, 94, 95, 96, 97, 98, 99, 2000, 2001
4
;;	 Free Software Foundation, Inc.
Eric S. Raymond's avatar
Eric S. Raymond committed
5

Eric S. Raymond's avatar
Eric S. Raymond committed
6
;; Author: William Sommerfeld <wesommer@athena.mit.edu>
Richard M. Stallman's avatar
Richard M. Stallman committed
7
;; Maintainer: FSF
Eric S. Raymond's avatar
Eric S. Raymond committed
8
;; Keywords: processes
Eric S. Raymond's avatar
Eric S. Raymond committed
9

root's avatar
root committed
10 11 12 13 14 15
;; Changes by peck@sun.com and by rms.

;; 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
Eric S. Raymond's avatar
Eric S. Raymond committed
16
;; the Free Software Foundation; either version 2, or (at your option)
root's avatar
root committed
17 18 19 20 21 22 23 24
;; 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
25 26 27
;; along with GNU Emacs; see the file COPYING.  If not, write to the
;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
;; Boston, MA 02111-1307, USA.
root's avatar
root committed
28

Eric S. Raymond's avatar
Eric S. Raymond committed
29
;;; Commentary:
root's avatar
root committed
30

Erik Naggum's avatar
Erik Naggum committed
31 32
;; This Lisp code is run in Emacs when it is to operate as
;; a server for other processes.
root's avatar
root committed
33

Erik Naggum's avatar
Erik Naggum committed
34 35 36 37
;; Load this library and do M-x server-edit to enable Emacs as a server.
;; Emacs runs the program ../arch-lib/emacsserver as a subprocess
;; for communication with clients.  If there are no client buffers to edit, 
;; server-edit acts like (switch-to-buffer (other-buffer))
root's avatar
root committed
38

Erik Naggum's avatar
Erik Naggum committed
39 40 41 42
;; When some other program runs "the editor" to edit a file,
;; "the editor" can be the Emacs client program ../lib-src/emacsclient.
;; This program transmits the file names to Emacs through
;; the server subprocess, and Emacs visits them and lets you edit them.
root's avatar
root committed
43

Erik Naggum's avatar
Erik Naggum committed
44
;; Note that any number of clients may dispatch files to emacs to be edited.
root's avatar
root committed
45

Erik Naggum's avatar
Erik Naggum committed
46 47 48 49 50
;; When you finish editing a Server buffer, again call server-edit
;; to mark that buffer as done for the client and switch to the next 
;; Server buffer.  When all the buffers for a client have been edited 
;; and exited with server-edit, the client "editor" will return
;; to the program that invoked it.  
root's avatar
root committed
51

Erik Naggum's avatar
Erik Naggum committed
52 53 54 55
;; Your editing commands and Emacs's display output go to and from
;; the terminal in the usual way.  Thus, server operation is possible
;; only when Emacs can talk to the terminal at the time you invoke
;; the client.  This is possible in four cases:
root's avatar
root committed
56

Erik Naggum's avatar
Erik Naggum committed
57 58
;; 1. On a window system, where Emacs runs in one window and the
;; program that wants to use "the editor" runs in another.
root's avatar
root committed
59

Erik Naggum's avatar
Erik Naggum committed
60 61
;; 2. On a multi-terminal system, where Emacs runs on one terminal and the
;; program that wants to use "the editor" runs on another.
root's avatar
root committed
62

Erik Naggum's avatar
Erik Naggum committed
63 64
;; 3. When the program that wants to use "the editor" is running
;; as a subprocess of Emacs.
root's avatar
root committed
65

Erik Naggum's avatar
Erik Naggum committed
66 67 68 69 70
;; 4. On a system with job control, when Emacs is suspended, the program
;; that wants to use "the editor" will stop and display
;; "Waiting for Emacs...".  It can then be suspended, and Emacs can be
;; brought into the foreground for editing.  When done editing, Emacs is
;; suspended again, and the client program is brought into the foreground.
root's avatar
root committed
71

Erik Naggum's avatar
Erik Naggum committed
72 73 74 75
;; The buffer local variable "server-buffer-clients" lists 
;; the clients who are waiting for this buffer to be edited.  
;; The global variable "server-clients" lists all the waiting clients,
;; and which files are yet to be edited for each.
Eric S. Raymond's avatar
Eric S. Raymond committed
76 77

;;; Code:
78 79 80

(eval-when-compile (require 'cl))

Richard M. Stallman's avatar
Richard M. Stallman committed
81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103
(defgroup server nil
  "Emacs running as a server process."
  :group 'external)

(defcustom server-program (expand-file-name "emacsserver" exec-directory)
  "*The program to use as the edit server."
  :group 'server
  :type 'string)

(defcustom server-visit-hook nil
  "*List of hooks to call when visiting a file for the Emacs server."
  :group 'server
  :type '(repeat function))

(defcustom server-switch-hook nil
  "*List of hooks to call when switching to a buffer for the Emacs server."
  :group 'server
  :type '(repeat function))

(defcustom server-done-hook nil
  "*List of hooks to call when done editing a buffer for the Emacs server."
  :group 'server
  :type '(repeat function))
104

root's avatar
root committed
105
(defvar server-process nil 
106
  "The current server process")
root's avatar
root committed
107

108 109
(defvar server-previous-string "")

root's avatar
root committed
110 111
(defvar server-clients nil
  "List of current server clients.
112
Each element is (CLIENTID BUFFERS...) where CLIENTID is a string
root's avatar
root committed
113 114 115 116
that can be given to the server process to identify a client.
When a buffer is marked as \"done\", it is removed from this list.")

(defvar server-buffer-clients nil
117
  "List of client ids for clients requesting editing of current buffer.")
118
(make-variable-buffer-local 'server-buffer-clients)
root's avatar
root committed
119 120 121
;; Changing major modes should not erase this local.
(put 'server-buffer-clients 'permanent-local t)

122 123 124 125 126
(defvar server-window nil
  "*The window to use for selecting Emacs server buffers.
If nil, use the selected window.
If it is a frame, use the frame's selected window.")

Richard M. Stallman's avatar
Richard M. Stallman committed
127
(defcustom server-temp-file-regexp "^/tmp/Re\\|/draft$"
root's avatar
root committed
128 129
  "*Regexp which should match filenames of temporary files
which are deleted and reused after each edit
130
by the programs that invoke the Emacs server."
Richard M. Stallman's avatar
Richard M. Stallman committed
131 132
  :group 'server
  :type 'regexp)
root's avatar
root committed
133

134 135 136 137 138 139 140 141 142 143 144 145
(defcustom server-kill-new-buffers t
  "*Whether to kill buffers when done with them.
If non-nil, kill a buffer unless it already existed before editing
it with Emacs server. If nil, kill only buffers as specified by
`server-temp-file-regexp'.
Please note that only buffers are killed that still have a client,
i.e. buffers visited which \"emacsclient --no-wait\" are never killed in
this way."
  :group 'server
  :type 'boolean
  :version "21.1")

root's avatar
root committed
146 147 148
(or (assq 'server-buffer-clients minor-mode-alist)
    (setq minor-mode-alist (cons '(server-buffer-clients " Server") minor-mode-alist)))

149
(defvar server-existing-buffer nil
150 151 152 153
  "Non-nil means a buffer existed before the Emacs server was asked visit it.
This means that the server should not kill the buffer when you say you
are done with it in the server.  This variable is local in each buffer
where it is set.")
154 155
(make-variable-buffer-local 'server-existing-buffer)

root's avatar
root committed
156 157
;; If a *server* buffer exists,
;; write STRING to it for logging purposes.
158
(defun server-log (string &optional client)
root's avatar
root committed
159
  (if (get-buffer "*server*")
160
      (with-current-buffer "*server*"
root's avatar
root committed
161
	(goto-char (point-max))
162 163 164
	(insert (current-time-string)
		(if client (format " <%s>: " client) " ")
		string)
165
	(or (bolp) (newline)))))
root's avatar
root committed
166 167 168 169 170 171 172

(defun server-sentinel (proc msg)
  (cond ((eq (process-status proc) 'exit)
	 (server-log (message "Server subprocess exited")))
	((eq (process-status proc) 'signal)
	 (server-log (message "Server subprocess killed")))))

Roland McGrath's avatar
Roland McGrath committed
173
;;;###autoload
root's avatar
root committed
174 175 176 177
(defun server-start (&optional leave-dead)
  "Allow this Emacs process to be a server for client processes.
This starts a server communications subprocess through which
client \"editors\" can send your editing commands to this Emacs job.
Richard M. Stallman's avatar
Richard M. Stallman committed
178
To use the server, set up the program `emacsclient' in the
root's avatar
root committed
179 180 181 182 183
Emacs distribution as your standard \"editor\".

Prefix arg means just kill any existing server communications subprocess."
  (interactive "P")
  ;; kill it dead!
184
  (condition-case () (delete-process server-process) (error nil))
185
  ;; Delete the socket files made by previous server invocations.
186 187
  (let* ((sysname (system-name))
	 (dot-index (string-match "\\." sysname)))
188 189 190
    (condition-case ()
	(delete-file (format "~/.emacs-server-%s" sysname))
      (error nil))
191 192 193 194 195 196
    (condition-case ()
	(delete-file (format "/tmp/esrv%d-%s" (user-uid) sysname))
      (error nil))
    ;; In case the server file name was made with a domainless hostname,
    ;; try deleting that name too.
    (if dot-index
197 198 199 200 201 202 203 204
	(let ((shortname (substring sysname 0 dot-index)))
	  (condition-case ()
	      (delete-file (format "~/.emacs-server-%s" shortname))
	    (error nil))
	  (condition-case ()
	      (delete-file (format "/tmp/esrv%d-%s" (user-uid) shortname))
	    (error nil)))))
  ;; If this Emacs already had a server, clear out associated status.
root's avatar
root committed
205 206 207
  (while server-clients
    (let ((buffer (nth 1 (car server-clients))))
      (server-buffer-done buffer)))
208
  (unless leave-dead
root's avatar
root committed
209 210
    (if server-process
	(server-log (message "Restarting server")))
211 212 213 214
    ;; Using a pty is wasteful, and the separate session causes
    ;; annoyance sometimes (some systems kill idle sessions).
    (let ((process-connection-type nil))
      (setq server-process (start-process "server" nil server-program)))
root's avatar
root committed
215 216
    (set-process-sentinel server-process 'server-sentinel)
    (set-process-filter server-process 'server-process-filter)
217 218 219 220
    ;; We must receive file names without being decoded.  Those are
    ;; decoded by server-process-filter accoding to
    ;; file-name-coding-system.
    (set-process-coding-system server-process 'raw-text 'raw-text)
root's avatar
root committed
221 222 223 224 225 226
    (process-kill-without-query server-process)))

;Process a request from the server to edit some files.
;Format of STRING is "Client: CLIENTID PATH PATH PATH... \n"
(defun server-process-filter (proc string)
  (server-log string)
227
  (setq string (concat server-previous-string string))
228 229 230 231
  ;; If the input is multiple lines,
  ;; process each line individually.
  (while (string-match "\n" string)
    (let ((request (substring string 0 (match-beginning 0)))
232 233 234
	  (coding-system (and default-enable-multibyte-characters
			      (or file-name-coding-system
				  default-file-name-coding-system)))
235
	  client nowait
root's avatar
root committed
236
	  (files nil)
237 238
	  (lineno 1)
	  (columnno 0))
239 240
      ;; Remove this line from STRING.
      (setq string (substring string (match-end 0)))	  
241
      (if (string-match "^Error: " request)
242
	  (message "Server error: %s" (substring request (match-end 0)))
243
	(if (string-match "^Client: " request)
244 245 246 247 248 249
	    (progn
	      (setq request (substring request (match-end 0)))
	      (setq client (list (substring request 0 (string-match " " request))))
	      (setq request (substring request (match-end 0)))
	      (while (string-match "[^ ]+ " request)
		(let ((arg
250 251
		       (substring request (match-beginning 0) (1- (match-end 0))))
		      (pos 0))
252
		  (setq request (substring request (match-end 0)))
253 254 255 256 257 258
		  (cond
		   ((string-match "\\`-nowait" arg)
		    (setq nowait t))
		   ;; ARG is a line number option.
		   ((string-match "\\`\\+[0-9]+\\'" arg)
		    (setq lineno (string-to-int (substring arg 1))))
259
		   ;; ARG is line number:column option.
260 261 262 263 264 265 266 267 268
		   ((string-match "\\`+\\([0-9]+\\):\\([0-9]+\\)\\'" arg)
		    (setq lineno (string-to-int (match-string 1 arg))
			  columnno (string-to-int (match-string 2 arg))))
		   (t
		    ;; ARG is a file name.
		    ;; Collapse multiple slashes to single slashes.
		    (setq arg (command-line-normalize-file-name arg))
		    ;; Undo the quoting that emacsclient does
		    ;; for certain special characters.
269 270 271 272 273 274 275 276 277
		    (setq arg
			  (replace-regexp-in-string
			   "&." (lambda (s)
				  (case (aref s 1)
				    (?& "&")
				    (?- "-")
				    (?n "\n")
				    (t " ")))
			   arg t t))
278 279 280
		    ;; Now decode the file name if necessary.
		    (if coding-system
			(setq arg (decode-coding-string arg coding-system)))
281
		    (push (list arg lineno columnno) files)
282 283
		    (setq lineno 1)
		    (setq columnno 0)))))
284 285 286 287
	      (when files
		(run-hooks 'pre-command-hook)
		(server-visit-files files client nowait)
		(run-hooks 'post-command-hook))
288
	      ;; CLIENT is now a list (CLIENTNUM BUFFERS...)
289 290 291 292 293
	      (if (null (cdr client))
		  ;; This client is empty; get rid of it immediately.
		  (progn
		    (send-string server-process 
				 (format "Close: %s Done\n" (car client)))
294
		    (server-log "Close empty client" (car client)))
295
		;; We visited some buffer for this client.
296
		(or nowait (push client server-clients))
297 298
		(server-switch-buffer (nth 1 client))
		(run-hooks 'server-switch-hook)
299 300 301
		(unless nowait
		  (message (substitute-command-keys
			    "When done with a buffer, type \\[server-edit]")))))))))
302 303
  ;; Save for later any partial line that remains.
  (setq server-previous-string string))
root's avatar
root committed
304

305 306 307 308 309 310
(defun server-goto-line-column (file-line-col)
  (goto-line (nth 1 file-line-col))
  (let ((column-number (nth 2 file-line-col)))
    (if (> column-number 0)
	(move-to-column (1- column-number)))))

311
(defun server-visit-files (files client &optional nowait)
root's avatar
root committed
312
  "Finds FILES and returns the list CLIENT with the buffers nconc'd.
313
FILES is an alist whose elements are (FILENAME LINENUMBER COLUMNNUMBER).
314 315
NOWAIT non-nil means this client is not waiting for the results,
so don't mark these buffers specially, just visit them normally."
316 317
  ;; Bind last-nonmenu-event to force use of keyboard, not mouse, for queries.
  (let (client-record (last-nonmenu-event t) (obuf (current-buffer)))
318 319 320 321 322
    ;; Restore the current buffer afterward, but not using save-excursion,
    ;; because we don't want to save point in this buffer
    ;; if it happens to be one of those specified by the server.
    (unwind-protect
	(while files
323 324 325
	  ;; If there is an existing buffer modified or the file is
	  ;; modified, revert it.  If there is an existing buffer with
	  ;; deleted file, offer to write it.
326 327
	  (let* ((filen (car (car files)))
		 (obuf (get-file-buffer filen)))
328
	    (push filen file-name-history)
329
	    (if (and obuf (set-buffer obuf))
330 331
		(progn
		  (cond ((file-exists-p filen)
332
			 (if (not (verify-visited-file-modtime obuf))
333 334 335 336 337 338 339 340
			     (revert-buffer t nil)))
			(t
			 (if (y-or-n-p
			      (concat "File no longer exists: "
				      filen
				      ", write buffer to file? "))
			     (write-file filen))))
		  (setq server-existing-buffer t)
341
		  (server-goto-line-column (car files)))
342
	      (set-buffer (find-file-noselect filen))
343
	      (server-goto-line-column (car files))
344
	      (run-hooks 'server-visit-hook)))
345 346 347
	  (if (not nowait)
	      (setq server-buffer-clients
		    (cons (car client) server-buffer-clients)))
348 349 350
	  (setq client-record (cons (current-buffer) client-record))
	  (setq files (cdr files)))
      (set-buffer obuf))
root's avatar
root committed
351 352
    (nconc client client-record)))

353
(defun server-buffer-done (buffer &optional for-killing)
root's avatar
root committed
354
  "Mark BUFFER as \"done\" for its client(s).
355 356
This buries the buffer, then returns a list of the form (NEXT-BUFFER KILLED).
NEXT-BUFFER is another server buffer, as a suggestion for what to select next,
357 358 359
or nil.  KILLED is t if we killed BUFFER (typically, because it was visiting
a temp file).
FOR-KILLING if non-nil indicates that we are called from `kill-buffer'."
root's avatar
root committed
360 361
  (let ((running (eq (process-status server-process) 'run))
	(next-buffer nil)
362
	(killed nil)
363
	(first t)
root's avatar
root committed
364 365 366
	(old-clients server-clients))
    (while old-clients
      (let ((client (car old-clients)))
367
	(or next-buffer
root's avatar
root committed
368 369
	    (setq next-buffer (nth 1 (memq buffer client))))
	(delq buffer client)
370 371 372 373 374 375 376
	;; Delete all dead buffers from CLIENT.
	(let ((tail client))
	  (while tail
	    (and (bufferp (car tail))
		 (null (buffer-name (car tail)))
		 (delq (car tail) client))
	    (setq tail (cdr tail))))
root's avatar
root committed
377 378 379 380 381
	;; If client now has no pending buffers,
	;; tell it that it is done, and forget it entirely.
	(if (cdr client) nil
	  (if running
	      (progn
382 383
		;; Don't send emacsserver two commands in close succession.
		;; It cannot handle that.
384 385
		(or first (sit-for 1))
		(setq first nil)
386
		(send-string server-process
387
			     (format "Close: %s Done\n" (car client)))
388
		(server-log "Close" (car client))))
root's avatar
root committed
389 390
	  (setq server-clients (delq client server-clients))))
      (setq old-clients (cdr old-clients)))
391
    (if (and (bufferp buffer) (buffer-name buffer))
392 393 394 395
	;; We may or may not kill this buffer;
	;; if we do, do not call server-buffer-done recursively
	;; from kill-buffer-hook.
	(let ((server-kill-buffer-running t))
396 397
	  (save-excursion
	    (set-buffer buffer)
398 399
	    (setq server-buffer-clients nil)
	    (run-hooks 'server-done-hook))
400 401 402 403 404 405
	  ;; Notice whether server-done-hook killed the buffer.
	  (if (null (buffer-name buffer))
	      (setq killed t)
	    ;; Don't bother killing or burying the buffer
	    ;; when we are called from kill-buffer.
	    (unless for-killing
406 407
	      (when (and (not killed)
			 server-kill-new-buffers
408 409
			 (with-current-buffer buffer
			   (not server-existing-buffer)))
410
		(setq killed t)
411
		(bury-buffer buffer)
412 413 414 415 416 417 418
		(kill-buffer buffer))
	      (unless killed
		(if (server-temp-file-p buffer)
		    (progn
		      (kill-buffer buffer)
		      (setq killed t))
		  (bury-buffer buffer)))))))
419
    (list next-buffer killed)))
root's avatar
root committed
420 421 422 423 424 425 426 427 428 429 430 431

(defun server-temp-file-p (buffer)
  "Return non-nil if BUFFER contains a file considered temporary.
These are files whose names suggest they are repeatedly
reused to pass information to another program.

The variable `server-temp-file-regexp' controls which filenames
are considered temporary."
  (and (buffer-file-name buffer)
       (string-match server-temp-file-regexp (buffer-file-name buffer))))

(defun server-done ()
Christopher Zaborsky's avatar
Christopher Zaborsky committed
432
  "Offer to save current buffer, mark it as \"done\" for clients.
433 434 435 436 437
This kills or buries the buffer, then returns a list
of the form (NEXT-BUFFER KILLED).  NEXT-BUFFER is another server buffer,
as a suggestion for what to select next, or nil.
KILLED is t if we killed BUFFER, which happens if it was created
specifically for the clients and did not exist before their request for it."
root's avatar
root committed
438 439
  (let ((buffer (current-buffer)))
    (if server-buffer-clients
440
	(progn
root's avatar
root committed
441
 	  (if (server-temp-file-p buffer)
442 443 444 445
	      ;; For a temp file, save, and do make a non-numeric backup
	      ;; (unless make-backup-files is nil).
	      (let ((version-control nil)
		    (buffer-backed-up nil))
446
		(save-buffer))
root's avatar
root committed
447
	    (if (and (buffer-modified-p)
448
		     buffer-file-name
root's avatar
root committed
449 450
		     (y-or-n-p (concat "Save file " buffer-file-name "? ")))
		(save-buffer buffer)))
451
	  (server-buffer-done buffer)))))
452

Richard M. Stallman's avatar
Richard M. Stallman committed
453 454 455 456
;; Ask before killing a server buffer.
;; It was suggested to release its client instead,
;; but I think that is dangerous--the client would proceed
;; using whatever is on disk in that file. -- rms.
457 458 459 460 461
(defun server-kill-buffer-query-function ()
  (or (not server-buffer-clients)
      (yes-or-no-p (format "Buffer `%s' still has clients; kill it? "
			   (buffer-name (current-buffer))))))

462
(add-hook 'kill-buffer-query-functions
463 464 465
 	  'server-kill-buffer-query-function)

(defun server-kill-emacs-query-function ()
466 467 468 469 470 471 472 473 474
  (let (live-client
	(tail server-clients))
    ;; See if any clients have any buffers that are still alive.
    (while tail
      (if (memq t (mapcar 'stringp (mapcar 'buffer-name (cdr (car tail)))))
	  (setq live-client t))
      (setq tail (cdr tail)))
    (or (not live-client)
	(yes-or-no-p "Server buffers still have clients; exit anyway? "))))
475 476

(add-hook 'kill-emacs-query-functions 'server-kill-emacs-query-function)
477

478
(defvar server-kill-buffer-running nil
479
  "Non-nil while `server-kill-buffer' or `server-buffer-done' is running.")
480

481 482 483
;; When a buffer is killed, inform the clients.
(add-hook 'kill-buffer-hook 'server-kill-buffer)
(defun server-kill-buffer ()
484 485 486
  ;; Prevent infinite recursion if user has made server-done-hook
  ;; call kill-buffer.
  (or server-kill-buffer-running
487 488 489 490
      (and server-buffer-clients
	   (let ((server-kill-buffer-running t))
	     (when server-process
	       (server-buffer-done (current-buffer) t))))))
root's avatar
root committed
491 492 493 494

(defun server-edit (&optional arg)
  "Switch to next server editing buffer; say \"Done\" for current buffer.
If a server buffer is current, it is marked \"done\" and optionally saved.
495
The buffer is also killed if it did not exist before the clients asked for it.
root's avatar
root committed
496 497 498
When all of a client's buffers are marked as \"done\", the client is notified.

Temporary files such as MH <draft> files are always saved and backed up,
499 500 501
no questions asked.  (The variable `make-backup-files', if nil, still
inhibits a backup; you can set it locally in a particular buffer to
prevent a backup for it.)  The variable `server-temp-file-regexp' controls
root's avatar
root committed
502 503 504 505 506 507 508 509 510
which filenames are considered temporary.

If invoked with a prefix argument, or if there is no server process running, 
starts server process and that is all.  Invoked by \\[server-edit]."
  (interactive "P")
  (if (or arg
	  (not server-process)
	  (memq (process-status server-process) '(signal exit)))
      (server-start nil)
511
    (apply 'server-switch-buffer (server-done))))
root's avatar
root committed
512

513
(defun server-switch-buffer (&optional next-buffer killed-one)
root's avatar
root committed
514 515
  "Switch to another buffer, preferably one that has a client.
Arg NEXT-BUFFER is a suggestion; if it is a live buffer, use it."
516 517 518 519
  ;; KILLED-ONE is t in a recursive call
  ;; if we have already killed one temp-file server buffer.
  ;; This means we should avoid the final "switch to some other buffer"
  ;; since we've already effectively done that.
520 521
  (cond ((and (windowp server-window)
	      (window-live-p server-window))
522 523
	 (select-window server-window))
	((framep server-window)
524 525
	 (if (not (frame-live-p server-window))
	     (setq server-window (make-frame)))
526
	 (select-window (frame-selected-window server-window))))
527
  (if (window-minibuffer-p (selected-window))
528 529
      (select-window (next-window nil 'nomini 0)))
  ;; Move to a non-dedicated window, if we have one.
530
  (when (window-dedicated-p (selected-window))
531 532 533
    (select-window (get-window-with-predicate
		    (lambda (w) (not (window-dedicated-p w)))
		    'nomini 'visible (selected-window))))
534
  (set-window-dedicated-p (selected-window) nil)
root's avatar
root committed
535 536 537 538 539 540 541
  (if next-buffer
      (if (and (bufferp next-buffer)
	       (buffer-name next-buffer))
	  (switch-to-buffer next-buffer)
	;; If NEXT-BUFFER is a dead buffer,
	;; remove the server records for it
	;; and try the next surviving server buffer.
542 543
	(apply 'server-switch-buffer
	       (server-buffer-done next-buffer)))
root's avatar
root committed
544
    (if server-clients
545 546 547
	(server-switch-buffer (nth 1 (car server-clients)) killed-one)
      (if (not killed-one)
	  (switch-to-buffer (other-buffer))))))
root's avatar
root committed
548 549

(global-set-key "\C-x#" 'server-edit)
550 551 552 553 554

(defun server-unload-hook ()
  (remove-hook 'kill-buffer-query-functions 'server-kill-buffer-query-function)
  (remove-hook 'kill-emacs-query-functions 'server-kill-emacs-query-function)
  (remove-hook 'kill-buffer-hook 'server-kill-buffer))
Roland McGrath's avatar
Roland McGrath committed
555 556

(provide 'server)
Eric S. Raymond's avatar
Eric S. Raymond committed
557 558

;;; server.el ends here