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c88ab9ce ER |
1 | ;;; server.el --- Lisp code for GNU Emacs running as server process. |
2 | ||
ab1c7f35 | 3 | ;; Copyright (C) 1986, 87, 92, 94, 95, 96, 1997 Free Software Foundation, Inc. |
6d74b528 | 4 | |
630cc463 | 5 | ;; Author: William Sommerfeld <wesommer@athena.mit.edu> |
e4874521 | 6 | ;; Maintainer: FSF |
d7b4d18f | 7 | ;; Keywords: processes |
630cc463 | 8 | |
9ae0f972 | 9 | ;; Changes by peck@sun.com and by rms. |
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 | |
e5167999 | 15 | ;; the Free Software Foundation; either version 2, or (at your option) |
9ae0f972 | 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 | |
b578f267 EN |
24 | ;; along with GNU Emacs; see the file COPYING. If not, write to the |
25 | ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
26 | ;; Boston, MA 02111-1307, USA. | |
9ae0f972 | 27 | |
630cc463 | 28 | ;;; Commentary: |
9ae0f972 | 29 | |
b578f267 EN |
30 | ;; This Lisp code is run in Emacs when it is to operate as |
31 | ;; a server for other processes. | |
9ae0f972 | 32 | |
b578f267 EN |
33 | ;; Load this library and do M-x server-edit to enable Emacs as a server. |
34 | ;; Emacs runs the program ../arch-lib/emacsserver as a subprocess | |
35 | ;; for communication with clients. If there are no client buffers to edit, | |
36 | ;; server-edit acts like (switch-to-buffer (other-buffer)) | |
9ae0f972 | 37 | |
b578f267 EN |
38 | ;; When some other program runs "the editor" to edit a file, |
39 | ;; "the editor" can be the Emacs client program ../lib-src/emacsclient. | |
40 | ;; This program transmits the file names to Emacs through | |
41 | ;; the server subprocess, and Emacs visits them and lets you edit them. | |
9ae0f972 | 42 | |
b578f267 | 43 | ;; Note that any number of clients may dispatch files to emacs to be edited. |
9ae0f972 | 44 | |
b578f267 EN |
45 | ;; When you finish editing a Server buffer, again call server-edit |
46 | ;; to mark that buffer as done for the client and switch to the next | |
47 | ;; Server buffer. When all the buffers for a client have been edited | |
48 | ;; and exited with server-edit, the client "editor" will return | |
49 | ;; to the program that invoked it. | |
9ae0f972 | 50 | |
b578f267 EN |
51 | ;; Your editing commands and Emacs's display output go to and from |
52 | ;; the terminal in the usual way. Thus, server operation is possible | |
53 | ;; only when Emacs can talk to the terminal at the time you invoke | |
54 | ;; the client. This is possible in four cases: | |
9ae0f972 | 55 | |
b578f267 EN |
56 | ;; 1. On a window system, where Emacs runs in one window and the |
57 | ;; program that wants to use "the editor" runs in another. | |
9ae0f972 | 58 | |
b578f267 EN |
59 | ;; 2. On a multi-terminal system, where Emacs runs on one terminal and the |
60 | ;; program that wants to use "the editor" runs on another. | |
9ae0f972 | 61 | |
b578f267 EN |
62 | ;; 3. When the program that wants to use "the editor" is running |
63 | ;; as a subprocess of Emacs. | |
9ae0f972 | 64 | |
b578f267 EN |
65 | ;; 4. On a system with job control, when Emacs is suspended, the program |
66 | ;; that wants to use "the editor" will stop and display | |
67 | ;; "Waiting for Emacs...". It can then be suspended, and Emacs can be | |
68 | ;; brought into the foreground for editing. When done editing, Emacs is | |
69 | ;; suspended again, and the client program is brought into the foreground. | |
9ae0f972 | 70 | |
b578f267 EN |
71 | ;; The buffer local variable "server-buffer-clients" lists |
72 | ;; the clients who are waiting for this buffer to be edited. | |
73 | ;; The global variable "server-clients" lists all the waiting clients, | |
74 | ;; and which files are yet to be edited for each. | |
630cc463 ER |
75 | |
76 | ;;; Code: | |
9ae0f972 | 77 | \f |
ab1c7f35 RS |
78 | (defgroup server nil |
79 | "Emacs running as a server process." | |
80 | :group 'external) | |
81 | ||
82 | (defcustom server-program (expand-file-name "emacsserver" exec-directory) | |
83 | "*The program to use as the edit server." | |
84 | :group 'server | |
85 | :type 'string) | |
86 | ||
87 | (defcustom server-visit-hook nil | |
88 | "*List of hooks to call when visiting a file for the Emacs server." | |
89 | :group 'server | |
90 | :type '(repeat function)) | |
91 | ||
92 | (defcustom server-switch-hook nil | |
93 | "*List of hooks to call when switching to a buffer for the Emacs server." | |
94 | :group 'server | |
95 | :type '(repeat function)) | |
96 | ||
97 | (defcustom server-done-hook nil | |
98 | "*List of hooks to call when done editing a buffer for the Emacs server." | |
99 | :group 'server | |
100 | :type '(repeat function)) | |
f9b3ef88 | 101 | |
9ae0f972 | 102 | (defvar server-process nil |
103 | "the current server process") | |
104 | ||
b53d289e RS |
105 | (defvar server-previous-string "") |
106 | ||
9ae0f972 | 107 | (defvar server-clients nil |
108 | "List of current server clients. | |
e82e73c2 | 109 | Each element is (CLIENTID BUFFERS...) where CLIENTID is a string |
9ae0f972 | 110 | that can be given to the server process to identify a client. |
111 | When a buffer is marked as \"done\", it is removed from this list.") | |
112 | ||
113 | (defvar server-buffer-clients nil | |
114 | "List of clientids for clients requesting editing of current buffer.") | |
faf931a8 | 115 | (make-variable-buffer-local 'server-buffer-clients) |
9ae0f972 | 116 | ;; Changing major modes should not erase this local. |
117 | (put 'server-buffer-clients 'permanent-local t) | |
118 | ||
ec40ed9f RS |
119 | (defvar server-window nil |
120 | "*The window to use for selecting Emacs server buffers. | |
121 | If nil, use the selected window. | |
122 | If it is a frame, use the frame's selected window.") | |
123 | ||
ab1c7f35 | 124 | (defcustom server-temp-file-regexp "^/tmp/Re\\|/draft$" |
9ae0f972 | 125 | "*Regexp which should match filenames of temporary files |
126 | which are deleted and reused after each edit | |
ab1c7f35 RS |
127 | by the programs that invoke the emacs server." |
128 | :group 'server | |
129 | :type 'regexp) | |
9ae0f972 | 130 | |
9ae0f972 | 131 | (or (assq 'server-buffer-clients minor-mode-alist) |
132 | (setq minor-mode-alist (cons '(server-buffer-clients " Server") minor-mode-alist))) | |
133 | ||
134 | ;; If a *server* buffer exists, | |
135 | ;; write STRING to it for logging purposes. | |
136 | (defun server-log (string) | |
137 | (if (get-buffer "*server*") | |
138 | (save-excursion | |
139 | (set-buffer "*server*") | |
140 | (goto-char (point-max)) | |
74c20cd3 RS |
141 | (insert (current-time-string) " " string) |
142 | (or (bolp) (newline))))) | |
9ae0f972 | 143 | |
144 | (defun server-sentinel (proc msg) | |
145 | (cond ((eq (process-status proc) 'exit) | |
146 | (server-log (message "Server subprocess exited"))) | |
147 | ((eq (process-status proc) 'signal) | |
148 | (server-log (message "Server subprocess killed"))))) | |
149 | ||
7229064d | 150 | ;;;###autoload |
9ae0f972 | 151 | (defun server-start (&optional leave-dead) |
152 | "Allow this Emacs process to be a server for client processes. | |
153 | This starts a server communications subprocess through which | |
154 | client \"editors\" can send your editing commands to this Emacs job. | |
42bbacdf | 155 | To use the server, set up the program `emacsclient' in the |
9ae0f972 | 156 | Emacs distribution as your standard \"editor\". |
157 | ||
158 | Prefix arg means just kill any existing server communications subprocess." | |
159 | (interactive "P") | |
160 | ;; kill it dead! | |
161 | (if server-process | |
162 | (progn | |
163 | (set-process-sentinel server-process nil) | |
164 | (condition-case () (delete-process server-process) (error nil)))) | |
c1148e39 | 165 | ;; Delete the socket files made by previous server invocations. |
14f67fa6 RS |
166 | (let* ((sysname (system-name)) |
167 | (dot-index (string-match "\\." sysname))) | |
c1148e39 RS |
168 | (condition-case () |
169 | (delete-file (format "~/.emacs-server-%s" sysname)) | |
170 | (error nil)) | |
14f67fa6 RS |
171 | (condition-case () |
172 | (delete-file (format "/tmp/esrv%d-%s" (user-uid) sysname)) | |
173 | (error nil)) | |
174 | ;; In case the server file name was made with a domainless hostname, | |
175 | ;; try deleting that name too. | |
176 | (if dot-index | |
c1148e39 RS |
177 | (let ((shortname (substring sysname 0 dot-index))) |
178 | (condition-case () | |
179 | (delete-file (format "~/.emacs-server-%s" shortname)) | |
180 | (error nil)) | |
181 | (condition-case () | |
182 | (delete-file (format "/tmp/esrv%d-%s" (user-uid) shortname)) | |
183 | (error nil))))) | |
184 | ;; If this Emacs already had a server, clear out associated status. | |
9ae0f972 | 185 | (while server-clients |
186 | (let ((buffer (nth 1 (car server-clients)))) | |
187 | (server-buffer-done buffer))) | |
188 | (if leave-dead | |
189 | nil | |
190 | (if server-process | |
191 | (server-log (message "Restarting server"))) | |
838cd60d RS |
192 | ;; Using a pty is wasteful, and the separate session causes |
193 | ;; annoyance sometimes (some systems kill idle sessions). | |
194 | (let ((process-connection-type nil)) | |
195 | (setq server-process (start-process "server" nil server-program))) | |
9ae0f972 | 196 | (set-process-sentinel server-process 'server-sentinel) |
197 | (set-process-filter server-process 'server-process-filter) | |
6b7430a8 KH |
198 | ;; We must receive file names without being decoded. Those are |
199 | ;; decoded by server-process-filter accoding to | |
200 | ;; file-name-coding-system. | |
201 | (set-process-coding-system server-process 'raw-text 'raw-text) | |
9ae0f972 | 202 | (process-kill-without-query server-process))) |
203 | \f | |
204 | ;Process a request from the server to edit some files. | |
205 | ;Format of STRING is "Client: CLIENTID PATH PATH PATH... \n" | |
206 | (defun server-process-filter (proc string) | |
207 | (server-log string) | |
b53d289e | 208 | (setq string (concat server-previous-string string)) |
68469f74 RS |
209 | ;; If the input is multiple lines, |
210 | ;; process each line individually. | |
211 | (while (string-match "\n" string) | |
212 | (let ((request (substring string 0 (match-beginning 0))) | |
6b7430a8 KH |
213 | (coding-system (and default-enable-multibyte-characters |
214 | (or file-name-coding-system | |
215 | default-file-name-coding-system))) | |
dfa35e6b | 216 | client nowait |
9ae0f972 | 217 | (files nil) |
218 | (lineno 1)) | |
68469f74 RS |
219 | ;; Remove this line from STRING. |
220 | (setq string (substring string (match-end 0))) | |
7e721a4f | 221 | (if (string-match "^Error: " request) |
26544100 | 222 | (message "Server error: %s" (substring request (match-end 0))) |
7e721a4f | 223 | (if (string-match "^Client: " request) |
77e5a3c7 RS |
224 | (progn |
225 | (setq request (substring request (match-end 0))) | |
226 | (setq client (list (substring request 0 (string-match " " request)))) | |
227 | (setq request (substring request (match-end 0))) | |
228 | (while (string-match "[^ ]+ " request) | |
229 | (let ((arg | |
8226e01e RS |
230 | (substring request (match-beginning 0) (1- (match-end 0)))) |
231 | (pos 0)) | |
77e5a3c7 | 232 | (setq request (substring request (match-end 0))) |
dfa35e6b RS |
233 | (if (string-match "\\`-nowait" arg) |
234 | (setq nowait t) | |
235 | (if (string-match "\\`\\+[0-9]+\\'" arg) | |
236 | ;; ARG is a line number option. | |
237 | (setq lineno (read (substring arg 1))) | |
238 | ;; ARG is a file name. | |
239 | ;; Collapse multiple slashes to single slashes. | |
240 | (setq arg (command-line-normalize-file-name arg)) | |
349e3f82 RS |
241 | ;; Undo the quoting that emacsclient does |
242 | ;; for certain special characters. | |
b59a6343 | 243 | (while (string-match "&." arg pos) |
349e3f82 RS |
244 | (setq pos (1+ (match-beginning 0))) |
245 | (let ((nextchar (aref arg pos))) | |
b59a6343 RS |
246 | (cond ((= nextchar ?&) |
247 | (setq arg (replace-match "&" t t arg))) | |
349e3f82 RS |
248 | ((= nextchar ?-) |
249 | (setq arg (replace-match "-" t t arg))) | |
250 | (t | |
251 | (setq arg (replace-match " " t t arg)))))) | |
6b7430a8 KH |
252 | ;; Now decode the file name if necessary. |
253 | (if coding-system | |
254 | (setq arg (decode-coding-string arg coding-system))) | |
dfa35e6b RS |
255 | (setq files |
256 | (cons (list arg lineno) | |
257 | files)) | |
258 | (setq lineno 1))))) | |
259 | (server-visit-files files client nowait) | |
77e5a3c7 | 260 | ;; CLIENT is now a list (CLIENTNUM BUFFERS...) |
0c40a645 KH |
261 | (if (null (cdr client)) |
262 | ;; This client is empty; get rid of it immediately. | |
263 | (progn | |
264 | (send-string server-process | |
265 | (format "Close: %s Done\n" (car client))) | |
266 | (server-log (format "Close empty client: %s Done\n" (car client)))) | |
267 | ;; We visited some buffer for this client. | |
268 | (or nowait | |
269 | (setq server-clients (cons client server-clients))) | |
270 | (server-switch-buffer (nth 1 client)) | |
271 | (run-hooks 'server-switch-hook) | |
272 | (message (substitute-command-keys | |
273 | "When done with a buffer, type \\[server-edit]")))))))) | |
68469f74 RS |
274 | ;; Save for later any partial line that remains. |
275 | (setq server-previous-string string)) | |
9ae0f972 | 276 | |
dfa35e6b | 277 | (defun server-visit-files (files client &optional nowait) |
9ae0f972 | 278 | "Finds FILES and returns the list CLIENT with the buffers nconc'd. |
dfa35e6b RS |
279 | FILES is an alist whose elements are (FILENAME LINENUMBER). |
280 | NOWAIT non-nil means this client is not waiting for the results, | |
281 | so don't mark these buffers specially, just visit them normally." | |
e82e73c2 RS |
282 | ;; Bind last-nonmenu-event to force use of keyboard, not mouse, for queries. |
283 | (let (client-record (last-nonmenu-event t) (obuf (current-buffer))) | |
3a0ce849 RS |
284 | ;; Restore the current buffer afterward, but not using save-excursion, |
285 | ;; because we don't want to save point in this buffer | |
286 | ;; if it happens to be one of those specified by the server. | |
287 | (unwind-protect | |
288 | (while files | |
289 | ;; If there is an existing buffer modified or the file is modified, | |
290 | ;; revert it. | |
291 | ;; If there is an existing buffer with deleted file, offer to write it. | |
292 | (let* ((filen (car (car files))) | |
293 | (obuf (get-file-buffer filen))) | |
294 | (if (and obuf (set-buffer obuf)) | |
295 | (if (file-exists-p filen) | |
296 | (if (or (not (verify-visited-file-modtime obuf)) | |
297 | (buffer-modified-p obuf)) | |
298 | (revert-buffer t nil)) | |
299 | (if (y-or-n-p | |
300 | (concat "File no longer exists: " | |
301 | filen | |
302 | ", write buffer to file? ")) | |
303 | (write-file filen))) | |
304 | (set-buffer (find-file-noselect filen)) | |
305 | (run-hooks 'server-visit-hook))) | |
306 | (goto-line (nth 1 (car files))) | |
dfa35e6b RS |
307 | (if (not nowait) |
308 | (setq server-buffer-clients | |
309 | (cons (car client) server-buffer-clients))) | |
3a0ce849 RS |
310 | (setq client-record (cons (current-buffer) client-record)) |
311 | (setq files (cdr files))) | |
312 | (set-buffer obuf)) | |
9ae0f972 | 313 | (nconc client client-record))) |
314 | \f | |
b392bac9 | 315 | (defun server-buffer-done (buffer &optional for-killing) |
9ae0f972 | 316 | "Mark BUFFER as \"done\" for its client(s). |
9184aafb RS |
317 | This buries the buffer, then returns a list of the form (NEXT-BUFFER KILLED). |
318 | NEXT-BUFFER is another server buffer, as a suggestion for what to select next, | |
599f9a5c RS |
319 | or nil. KILLED is t if we killed BUFFER |
320 | \(typically, because it was visiting a temp file)." | |
9ae0f972 | 321 | (let ((running (eq (process-status server-process) 'run)) |
322 | (next-buffer nil) | |
9184aafb | 323 | (killed nil) |
08c22983 | 324 | (first t) |
9ae0f972 | 325 | (old-clients server-clients)) |
326 | (while old-clients | |
327 | (let ((client (car old-clients))) | |
328 | (or next-buffer | |
329 | (setq next-buffer (nth 1 (memq buffer client)))) | |
330 | (delq buffer client) | |
68469f74 RS |
331 | ;; Delete all dead buffers from CLIENT. |
332 | (let ((tail client)) | |
333 | (while tail | |
334 | (and (bufferp (car tail)) | |
335 | (null (buffer-name (car tail))) | |
336 | (delq (car tail) client)) | |
337 | (setq tail (cdr tail)))) | |
9ae0f972 | 338 | ;; If client now has no pending buffers, |
339 | ;; tell it that it is done, and forget it entirely. | |
340 | (if (cdr client) nil | |
341 | (if running | |
342 | (progn | |
68469f74 RS |
343 | ;; Don't send emacsserver two commands in close succession. |
344 | ;; It cannot handle that. | |
08c22983 RS |
345 | (or first (sit-for 1)) |
346 | (setq first nil) | |
347 | (send-string server-process | |
348 | (format "Close: %s Done\n" (car client))) | |
349 | (server-log (format "Close: %s Done\n" (car client))))) | |
9ae0f972 | 350 | (setq server-clients (delq client server-clients)))) |
351 | (setq old-clients (cdr old-clients))) | |
68469f74 | 352 | (if (and (bufferp buffer) (buffer-name buffer)) |
599f9a5c RS |
353 | ;; We may or may not kill this buffer; |
354 | ;; if we do, do not call server-buffer-done recursively | |
355 | ;; from kill-buffer-hook. | |
356 | (let ((server-kill-buffer-running t)) | |
faf931a8 RS |
357 | (save-excursion |
358 | (set-buffer buffer) | |
f9b3ef88 RS |
359 | (setq server-buffer-clients nil) |
360 | (run-hooks 'server-done-hook)) | |
599f9a5c RS |
361 | ;; Notice whether server-done-hook killed the buffer. |
362 | (if (null (buffer-name buffer)) | |
363 | (setq killed t) | |
364 | ;; Don't bother killing or burying the buffer | |
365 | ;; when we are called from kill-buffer. | |
366 | (unless for-killing | |
b392bac9 RS |
367 | (if (server-temp-file-p buffer) |
368 | (progn (kill-buffer buffer) | |
369 | (setq killed t)) | |
599f9a5c | 370 | (bury-buffer buffer)))))) |
9184aafb | 371 | (list next-buffer killed))) |
9ae0f972 | 372 | |
373 | (defun server-temp-file-p (buffer) | |
374 | "Return non-nil if BUFFER contains a file considered temporary. | |
375 | These are files whose names suggest they are repeatedly | |
376 | reused to pass information to another program. | |
377 | ||
378 | The variable `server-temp-file-regexp' controls which filenames | |
379 | are considered temporary." | |
380 | (and (buffer-file-name buffer) | |
381 | (string-match server-temp-file-regexp (buffer-file-name buffer)))) | |
382 | ||
383 | (defun server-done () | |
cc9875f9 | 384 | "Offer to save current buffer, mark it as \"done\" for clients. |
9184aafb RS |
385 | This buries the buffer, then returns a list of the form (NEXT-BUFFER KILLED). |
386 | NEXT-BUFFER is another server buffer, as a suggestion for what to select next, | |
599f9a5c RS |
387 | or nil. KILLED is t if we killed BUFFER |
388 | \(typically, because it was visiting a temp file)." | |
9ae0f972 | 389 | (let ((buffer (current-buffer))) |
390 | (if server-buffer-clients | |
c58bf9ae | 391 | (progn |
9ae0f972 | 392 | (if (server-temp-file-p buffer) |
991298c3 RS |
393 | ;; For a temp file, save, and do make a non-numeric backup |
394 | ;; (unless make-backup-files is nil). | |
395 | (let ((version-control nil) | |
396 | (buffer-backed-up nil)) | |
c58bf9ae | 397 | (save-buffer)) |
9ae0f972 | 398 | (if (and (buffer-modified-p) |
ffdd2796 | 399 | buffer-file-name |
9ae0f972 | 400 | (y-or-n-p (concat "Save file " buffer-file-name "? "))) |
401 | (save-buffer buffer))) | |
c58bf9ae | 402 | (server-buffer-done buffer))))) |
faf931a8 | 403 | |
71207de2 RS |
404 | ;; Ask before killing a server buffer. |
405 | ;; It was suggested to release its client instead, | |
406 | ;; but I think that is dangerous--the client would proceed | |
407 | ;; using whatever is on disk in that file. -- rms. | |
03d78665 RS |
408 | (defun server-kill-buffer-query-function () |
409 | (or (not server-buffer-clients) | |
410 | (yes-or-no-p (format "Buffer `%s' still has clients; kill it? " | |
411 | (buffer-name (current-buffer)))))) | |
412 | ||
faf931a8 | 413 | (add-hook 'kill-buffer-query-functions |
03d78665 RS |
414 | 'server-kill-buffer-query-function) |
415 | ||
416 | (defun server-kill-emacs-query-function () | |
e82e73c2 RS |
417 | (let (live-client |
418 | (tail server-clients)) | |
419 | ;; See if any clients have any buffers that are still alive. | |
420 | (while tail | |
421 | (if (memq t (mapcar 'stringp (mapcar 'buffer-name (cdr (car tail))))) | |
422 | (setq live-client t)) | |
423 | (setq tail (cdr tail))) | |
424 | (or (not live-client) | |
425 | (yes-or-no-p "Server buffers still have clients; exit anyway? ")))) | |
03d78665 RS |
426 | |
427 | (add-hook 'kill-emacs-query-functions 'server-kill-emacs-query-function) | |
b392bac9 | 428 | |
fb873cfc | 429 | (defvar server-kill-buffer-running nil |
599f9a5c | 430 | "Non-nil while `server-kill-buffer' or `server-buffer-done' is running.") |
fb873cfc | 431 | |
b392bac9 RS |
432 | ;; When a buffer is killed, inform the clients. |
433 | (add-hook 'kill-buffer-hook 'server-kill-buffer) | |
434 | (defun server-kill-buffer () | |
fb873cfc RS |
435 | ;; Prevent infinite recursion if user has made server-done-hook |
436 | ;; call kill-buffer. | |
437 | (or server-kill-buffer-running | |
599f9a5c RS |
438 | (and server-buffer-clients |
439 | (let ((server-kill-buffer-running t)) | |
440 | (when server-process | |
441 | (server-buffer-done (current-buffer) t)))))) | |
9ae0f972 | 442 | \f |
443 | (defun server-edit (&optional arg) | |
444 | "Switch to next server editing buffer; say \"Done\" for current buffer. | |
445 | If a server buffer is current, it is marked \"done\" and optionally saved. | |
446 | When all of a client's buffers are marked as \"done\", the client is notified. | |
447 | ||
448 | Temporary files such as MH <draft> files are always saved and backed up, | |
991298c3 RS |
449 | no questions asked. (The variable `make-backup-files', if nil, still |
450 | inhibits a backup; you can set it locally in a particular buffer to | |
451 | prevent a backup for it.) The variable `server-temp-file-regexp' controls | |
9ae0f972 | 452 | which filenames are considered temporary. |
453 | ||
454 | If invoked with a prefix argument, or if there is no server process running, | |
455 | starts server process and that is all. Invoked by \\[server-edit]." | |
9ae0f972 | 456 | (interactive "P") |
457 | (if (or arg | |
458 | (not server-process) | |
459 | (memq (process-status server-process) '(signal exit))) | |
460 | (server-start nil) | |
9184aafb | 461 | (apply 'server-switch-buffer (server-done)))) |
9ae0f972 | 462 | |
98a4349c | 463 | (defun server-switch-buffer (&optional next-buffer killed-one) |
9ae0f972 | 464 | "Switch to another buffer, preferably one that has a client. |
465 | Arg NEXT-BUFFER is a suggestion; if it is a live buffer, use it." | |
9184aafb RS |
466 | ;; KILLED-ONE is t in a recursive call |
467 | ;; if we have already killed one temp-file server buffer. | |
468 | ;; This means we should avoid the final "switch to some other buffer" | |
469 | ;; since we've already effectively done that. | |
396e0e6a RS |
470 | (cond ((and (windowp server-window) |
471 | (window-live-p server-window)) | |
ec40ed9f RS |
472 | (select-window server-window)) |
473 | ((framep server-window) | |
396e0e6a RS |
474 | (if (not (frame-live-p server-window)) |
475 | (setq server-window (make-frame))) | |
ec40ed9f | 476 | (select-window (frame-selected-window server-window)))) |
e5ccf0c1 | 477 | (if (window-minibuffer-p (selected-window)) |
02a8d137 RS |
478 | (select-window (next-window nil 'nomini 0))) |
479 | ;; Move to a non-dedicated window, if we have one. | |
6d4dd885 GM |
480 | (select-window (some-window (lambda (w) (not (window-dedicated-p w))) |
481 | 'nomini 0 (selected-window))) | |
02a8d137 | 482 | (set-window-dedicated-p (selected-window) nil) |
9ae0f972 | 483 | (if next-buffer |
484 | (if (and (bufferp next-buffer) | |
485 | (buffer-name next-buffer)) | |
486 | (switch-to-buffer next-buffer) | |
487 | ;; If NEXT-BUFFER is a dead buffer, | |
488 | ;; remove the server records for it | |
489 | ;; and try the next surviving server buffer. | |
9184aafb RS |
490 | (apply 'server-switch-buffer |
491 | (server-buffer-done next-buffer))) | |
9ae0f972 | 492 | (if server-clients |
9184aafb RS |
493 | (server-switch-buffer (nth 1 (car server-clients)) killed-one) |
494 | (if (not killed-one) | |
495 | (switch-to-buffer (other-buffer)))))) | |
9ae0f972 | 496 | |
497 | (global-set-key "\C-x#" 'server-edit) | |
16c15321 RM |
498 | \f |
499 | (provide 'server) | |
c88ab9ce ER |
500 | |
501 | ;;; server.el ends here |