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55535639 | 1 | ;;; server.el --- Lisp code for GNU Emacs running as server process |
c88ab9ce | 2 | |
92a6563f | 3 | ;; Copyright (C) 1986, 87, 92, 94, 95, 96, 97, 98, 99, 2000, 2001 |
0f5f7c3e | 4 | ;; Free Software Foundation, Inc. |
6d74b528 | 5 | |
630cc463 | 6 | ;; Author: William Sommerfeld <wesommer@athena.mit.edu> |
e4874521 | 7 | ;; Maintainer: FSF |
d7b4d18f | 8 | ;; Keywords: processes |
630cc463 | 9 | |
9ae0f972 | 10 | ;; Changes by peck@sun.com and by rms. |
11 | ||
12 | ;; This file is part of GNU Emacs. | |
13 | ||
14 | ;; GNU Emacs is free software; you can redistribute it and/or modify | |
15 | ;; it under the terms of the GNU General Public License as published by | |
e5167999 | 16 | ;; the Free Software Foundation; either version 2, or (at your option) |
9ae0f972 | 17 | ;; any later version. |
18 | ||
19 | ;; GNU Emacs is distributed in the hope that it will be useful, | |
20 | ;; but WITHOUT ANY WARRANTY; without even the implied warranty of | |
21 | ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
22 | ;; GNU General Public License for more details. | |
23 | ||
24 | ;; You should have received a copy of the GNU General Public License | |
b578f267 EN |
25 | ;; along with GNU Emacs; see the file COPYING. If not, write to the |
26 | ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
27 | ;; Boston, MA 02111-1307, USA. | |
9ae0f972 | 28 | |
630cc463 | 29 | ;;; Commentary: |
9ae0f972 | 30 | |
b578f267 EN |
31 | ;; This Lisp code is run in Emacs when it is to operate as |
32 | ;; a server for other processes. | |
9ae0f972 | 33 | |
b578f267 | 34 | ;; Load this library and do M-x server-edit to enable Emacs as a server. |
44a56b29 SM |
35 | ;; Emacs opens up a socket for communication with clients. If there are no |
36 | ;; client buffers to edit, server-edit acts like (switch-to-buffer | |
37 | ;; (other-buffer)) | |
9ae0f972 | 38 | |
b578f267 EN |
39 | ;; When some other program runs "the editor" to edit a file, |
40 | ;; "the editor" can be the Emacs client program ../lib-src/emacsclient. | |
41 | ;; This program transmits the file names to Emacs through | |
42 | ;; the server subprocess, and Emacs visits them and lets you edit them. | |
9ae0f972 | 43 | |
b578f267 | 44 | ;; Note that any number of clients may dispatch files to emacs to be edited. |
9ae0f972 | 45 | |
b578f267 EN |
46 | ;; When you finish editing a Server buffer, again call server-edit |
47 | ;; to mark that buffer as done for the client and switch to the next | |
48 | ;; Server buffer. When all the buffers for a client have been edited | |
49 | ;; and exited with server-edit, the client "editor" will return | |
50 | ;; to the program that invoked it. | |
9ae0f972 | 51 | |
b578f267 EN |
52 | ;; Your editing commands and Emacs's display output go to and from |
53 | ;; the terminal in the usual way. Thus, server operation is possible | |
54 | ;; only when Emacs can talk to the terminal at the time you invoke | |
55 | ;; the client. This is possible in four cases: | |
9ae0f972 | 56 | |
b578f267 EN |
57 | ;; 1. On a window system, where Emacs runs in one window and the |
58 | ;; program that wants to use "the editor" runs in another. | |
9ae0f972 | 59 | |
b578f267 EN |
60 | ;; 2. On a multi-terminal system, where Emacs runs on one terminal and the |
61 | ;; program that wants to use "the editor" runs on another. | |
9ae0f972 | 62 | |
b578f267 EN |
63 | ;; 3. When the program that wants to use "the editor" is running |
64 | ;; as a subprocess of Emacs. | |
9ae0f972 | 65 | |
b578f267 EN |
66 | ;; 4. On a system with job control, when Emacs is suspended, the program |
67 | ;; that wants to use "the editor" will stop and display | |
68 | ;; "Waiting for Emacs...". It can then be suspended, and Emacs can be | |
69 | ;; brought into the foreground for editing. When done editing, Emacs is | |
70 | ;; suspended again, and the client program is brought into the foreground. | |
9ae0f972 | 71 | |
b578f267 EN |
72 | ;; The buffer local variable "server-buffer-clients" lists |
73 | ;; the clients who are waiting for this buffer to be edited. | |
74 | ;; The global variable "server-clients" lists all the waiting clients, | |
75 | ;; and which files are yet to be edited for each. | |
630cc463 ER |
76 | |
77 | ;;; Code: | |
8b3e840e SM |
78 | |
79 | (eval-when-compile (require 'cl)) | |
80 | ||
ab1c7f35 RS |
81 | (defgroup server nil |
82 | "Emacs running as a server process." | |
83 | :group 'external) | |
84 | ||
ab1c7f35 | 85 | (defcustom server-visit-hook nil |
0c851d78 | 86 | "*Hook run when visiting a file for the Emacs server." |
ab1c7f35 | 87 | :group 'server |
0c851d78 | 88 | :type 'hook) |
ab1c7f35 RS |
89 | |
90 | (defcustom server-switch-hook nil | |
0c851d78 | 91 | "*Hook run when switching to a buffer for the Emacs server." |
ab1c7f35 | 92 | :group 'server |
0c851d78 | 93 | :type 'hook) |
ab1c7f35 RS |
94 | |
95 | (defcustom server-done-hook nil | |
0c851d78 | 96 | "*Hook run when done editing a buffer for the Emacs server." |
ab1c7f35 | 97 | :group 'server |
0c851d78 | 98 | :type 'hook) |
f9b3ef88 | 99 | |
9ae0f972 | 100 | (defvar server-process nil |
b5a9911c | 101 | "The current server process") |
9ae0f972 | 102 | |
0c851d78 | 103 | (defvar server-previous-strings nil) |
b53d289e | 104 | |
9ae0f972 | 105 | (defvar server-clients nil |
106 | "List of current server clients. | |
e82e73c2 | 107 | Each element is (CLIENTID BUFFERS...) where CLIENTID is a string |
9ae0f972 | 108 | that can be given to the server process to identify a client. |
109 | When a buffer is marked as \"done\", it is removed from this list.") | |
110 | ||
111 | (defvar server-buffer-clients nil | |
b5a9911c | 112 | "List of client ids for clients requesting editing of current buffer.") |
faf931a8 | 113 | (make-variable-buffer-local 'server-buffer-clients) |
9ae0f972 | 114 | ;; Changing major modes should not erase this local. |
115 | (put 'server-buffer-clients 'permanent-local t) | |
116 | ||
ec40ed9f RS |
117 | (defvar server-window nil |
118 | "*The window to use for selecting Emacs server buffers. | |
119 | If nil, use the selected window. | |
120 | If it is a frame, use the frame's selected window.") | |
121 | ||
ab1c7f35 | 122 | (defcustom server-temp-file-regexp "^/tmp/Re\\|/draft$" |
9ae0f972 | 123 | "*Regexp which should match filenames of temporary files |
124 | which are deleted and reused after each edit | |
c6a117f0 | 125 | by the programs that invoke the Emacs server." |
ab1c7f35 RS |
126 | :group 'server |
127 | :type 'regexp) | |
9ae0f972 | 128 | |
c6a117f0 GM |
129 | (defcustom server-kill-new-buffers t |
130 | "*Whether to kill buffers when done with them. | |
131 | If non-nil, kill a buffer unless it already existed before editing | |
132 | it with Emacs server. If nil, kill only buffers as specified by | |
133 | `server-temp-file-regexp'. | |
134 | Please note that only buffers are killed that still have a client, | |
135 | i.e. buffers visited which \"emacsclient --no-wait\" are never killed in | |
136 | this way." | |
137 | :group 'server | |
138 | :type 'boolean | |
139 | :version "21.1") | |
140 | ||
9ae0f972 | 141 | (or (assq 'server-buffer-clients minor-mode-alist) |
142 | (setq minor-mode-alist (cons '(server-buffer-clients " Server") minor-mode-alist))) | |
143 | ||
c6a117f0 | 144 | (defvar server-existing-buffer nil |
ca0c7250 | 145 | "Non-nil means the buffer existed before the server was asked to visit it. |
4dd04714 | 146 | This means that the server should not kill the buffer when you say you |
ca0c7250 | 147 | are done with it in the server.") |
c6a117f0 GM |
148 | (make-variable-buffer-local 'server-existing-buffer) |
149 | ||
0c851d78 | 150 | (defvar server-socket-name |
15d40fa4 SM |
151 | (format "/tmp/esrv%d-%s" (user-uid) |
152 | (substring (system-name) 0 (string-match "\\." (system-name))))) | |
0c851d78 | 153 | |
9ae0f972 | 154 | ;; If a *server* buffer exists, |
155 | ;; write STRING to it for logging purposes. | |
8b3e840e | 156 | (defun server-log (string &optional client) |
9ae0f972 | 157 | (if (get-buffer "*server*") |
8b3e840e | 158 | (with-current-buffer "*server*" |
9ae0f972 | 159 | (goto-char (point-max)) |
8b3e840e | 160 | (insert (current-time-string) |
0c851d78 | 161 | (if client (format " %s:" client) " ") |
8b3e840e | 162 | string) |
74c20cd3 | 163 | (or (bolp) (newline))))) |
9ae0f972 | 164 | |
165 | (defun server-sentinel (proc msg) | |
0c851d78 SM |
166 | ;; Purge server-previous-strings of the now irrelevant entry. |
167 | (setq server-previous-strings | |
168 | (delq (assq proc server-previous-strings) server-previous-strings)) | |
169 | (let ((ps (assq proc server-clients))) | |
170 | (dolist (buf (cdr ps)) | |
171 | (with-current-buffer buf | |
172 | ;; Remove PROC from the clients of each buffer. | |
173 | (setq server-buffer-clients (delq proc server-buffer-clients)))) | |
174 | ;; Remove PROC from the list of clients. | |
175 | (if ps (setq server-clients (delq ps server-clients)))) | |
176 | (server-log (format "Status changed to %s" (process-status proc)) proc)) | |
177 | ||
44a56b29 SM |
178 | (defun server-select-display (display) |
179 | ;; If the current frame is on `display' we're all set. | |
180 | (unless (equal (frame-parameter (selected-frame) 'display) display) | |
181 | ;; Otherwise, look for an existing frame there and select it. | |
182 | (dolist (frame (frame-list)) | |
183 | (when (equal (frame-parameter frame 'display) display) | |
184 | (select-frame frame))) | |
185 | ;; If there's no frame on that display yet, create a dummy one | |
186 | ;; and select it. | |
187 | (unless (equal (frame-parameter (selected-frame) 'display) display) | |
188 | (select-frame | |
189 | (make-frame-on-display | |
190 | display | |
191 | ;; This frame is only there in place of an actual "current display" | |
192 | ;; setting, so we want it to be as unobtrusive as possible. That's | |
193 | ;; what the invisibility is for. The minibuffer setting is so that | |
194 | ;; we don't end up displaying a buffer in it (which noone would | |
195 | ;; notice). | |
196 | '((visibility . nil) (minibuffer . only))))))) | |
197 | ||
0c851d78 SM |
198 | (defun server-unquote-arg (arg) |
199 | (replace-regexp-in-string | |
200 | "&." (lambda (s) | |
201 | (case (aref s 1) | |
202 | (?& "&") | |
203 | (?- "-") | |
204 | (?n "\n") | |
205 | (t " "))) | |
206 | arg t t)) | |
9ae0f972 | 207 | |
7229064d | 208 | ;;;###autoload |
9ae0f972 | 209 | (defun server-start (&optional leave-dead) |
210 | "Allow this Emacs process to be a server for client processes. | |
211 | This starts a server communications subprocess through which | |
212 | client \"editors\" can send your editing commands to this Emacs job. | |
42bbacdf | 213 | To use the server, set up the program `emacsclient' in the |
9ae0f972 | 214 | Emacs distribution as your standard \"editor\". |
215 | ||
216 | Prefix arg means just kill any existing server communications subprocess." | |
217 | (interactive "P") | |
218 | ;; kill it dead! | |
8b3e840e | 219 | (condition-case () (delete-process server-process) (error nil)) |
c1148e39 | 220 | ;; Delete the socket files made by previous server invocations. |
0c851d78 | 221 | (condition-case () (delete-file server-socket-name) (error nil)) |
c1148e39 | 222 | ;; If this Emacs already had a server, clear out associated status. |
9ae0f972 | 223 | (while server-clients |
224 | (let ((buffer (nth 1 (car server-clients)))) | |
225 | (server-buffer-done buffer))) | |
8b3e840e | 226 | (unless leave-dead |
9ae0f972 | 227 | (if server-process |
228 | (server-log (message "Restarting server"))) | |
0c851d78 SM |
229 | (let ((umask (default-file-modes))) |
230 | (unwind-protect | |
231 | (progn | |
232 | (set-default-file-modes ?\700) | |
233 | (setq server-process | |
234 | (make-network-process | |
235 | :name "server" :family 'local :server t :noquery t | |
236 | :service server-socket-name | |
237 | :sentinel 'server-sentinel :filter 'server-process-filter | |
238 | ;; We must receive file names without being decoded. | |
239 | ;; Those are decoded by server-process-filter according | |
240 | ;; to file-name-coding-system. | |
241 | :coding 'raw-text))) | |
242 | (set-default-file-modes umask))))) | |
9ae0f972 | 243 | \f |
244 | ;Process a request from the server to edit some files. | |
0c851d78 | 245 | ;Format of STRING is "PATH PATH PATH... \n" |
9ae0f972 | 246 | (defun server-process-filter (proc string) |
0c851d78 SM |
247 | (server-log string proc) |
248 | (let ((ps (assq proc server-previous-strings))) | |
249 | (when (cdr ps) | |
250 | (setq string (concat (cdr ps) string)) | |
251 | (setcdr ps nil))) | |
68469f74 RS |
252 | ;; If the input is multiple lines, |
253 | ;; process each line individually. | |
254 | (while (string-match "\n" string) | |
255 | (let ((request (substring string 0 (match-beginning 0))) | |
6b7430a8 KH |
256 | (coding-system (and default-enable-multibyte-characters |
257 | (or file-name-coding-system | |
258 | default-file-name-coding-system))) | |
44a56b29 | 259 | client nowait eval |
9ae0f972 | 260 | (files nil) |
8c493570 GM |
261 | (lineno 1) |
262 | (columnno 0)) | |
68469f74 | 263 | ;; Remove this line from STRING. |
0c851d78 SM |
264 | (setq string (substring string (match-end 0))) |
265 | (setq client (cons proc nil)) | |
266 | (while (string-match "[^ ]* " request) | |
267 | (let ((arg (substring request (match-beginning 0) (1- (match-end 0)))) | |
268 | (pos 0)) | |
269 | (setq request (substring request (match-end 0))) | |
270 | (cond | |
271 | ((equal "-nowait" arg) (setq nowait t)) | |
44a56b29 SM |
272 | ((equal "-eval" arg) (setq eval t)) |
273 | ((and (equal "-display" arg) (string-match "\\([^ ]*\\) " request)) | |
274 | (let ((display (server-unquote-arg (match-string 1 request)))) | |
275 | (setq request (substring request (match-end 0))) | |
276 | (condition-case err | |
277 | (server-select-display display) | |
278 | (error (process-send-string proc (nth 1 err)) | |
279 | (setq request ""))))) | |
0c851d78 SM |
280 | ;; ARG is a line number option. |
281 | ((string-match "\\`\\+[0-9]+\\'" arg) | |
282 | (setq lineno (string-to-int (substring arg 1)))) | |
283 | ;; ARG is line number:column option. | |
284 | ((string-match "\\`+\\([0-9]+\\):\\([0-9]+\\)\\'" arg) | |
285 | (setq lineno (string-to-int (match-string 1 arg)) | |
286 | columnno (string-to-int (match-string 2 arg)))) | |
287 | (t | |
288 | ;; Undo the quoting that emacsclient does | |
289 | ;; for certain special characters. | |
290 | (setq arg (server-unquote-arg arg)) | |
291 | ;; Now decode the file name if necessary. | |
292 | (if coding-system | |
293 | (setq arg (decode-coding-string arg coding-system))) | |
44a56b29 SM |
294 | (if eval |
295 | (let ((v (eval (car (read-from-string arg))))) | |
296 | (when v | |
297 | (with-temp-buffer | |
298 | (let ((standard-output (current-buffer))) | |
299 | (pp v) | |
300 | (process-send-region proc (point-min) (point-max)))))) | |
301 | ;; ARG is a file name. | |
302 | ;; Collapse multiple slashes to single slashes. | |
303 | (setq arg (command-line-normalize-file-name arg)) | |
304 | (push (list arg lineno columnno) files)) | |
0c851d78 SM |
305 | (setq lineno 1) |
306 | (setq columnno 0))))) | |
307 | (when files | |
308 | (run-hooks 'pre-command-hook) | |
309 | (server-visit-files files client nowait) | |
310 | (run-hooks 'post-command-hook)) | |
311 | ;; CLIENT is now a list (CLIENTNUM BUFFERS...) | |
312 | (if (null (cdr client)) | |
313 | ;; This client is empty; get rid of it immediately. | |
314 | (progn | |
315 | (delete-process proc) | |
316 | (server-log "Close empty client" proc)) | |
317 | ;; We visited some buffer for this client. | |
318 | (or nowait (push client server-clients)) | |
319 | (server-switch-buffer (nth 1 client)) | |
320 | (run-hooks 'server-switch-hook) | |
321 | (unless nowait | |
322 | (message (substitute-command-keys | |
323 | "When done with a buffer, type \\[server-edit]")))))) | |
68469f74 | 324 | ;; Save for later any partial line that remains. |
0c851d78 SM |
325 | (when (> (length string) 0) |
326 | (let ((ps (assq proc server-previous-strings))) | |
327 | (if ps (setcdr ps string) | |
328 | (push (cons proc string) server-previous-strings))))) | |
9ae0f972 | 329 | |
6b98185f RS |
330 | (defun server-goto-line-column (file-line-col) |
331 | (goto-line (nth 1 file-line-col)) | |
332 | (let ((column-number (nth 2 file-line-col))) | |
333 | (if (> column-number 0) | |
334 | (move-to-column (1- column-number))))) | |
335 | ||
dfa35e6b | 336 | (defun server-visit-files (files client &optional nowait) |
44a56b29 | 337 | "Find FILES and return the list CLIENT with the buffers nconc'd. |
8c493570 | 338 | FILES is an alist whose elements are (FILENAME LINENUMBER COLUMNNUMBER). |
dfa35e6b RS |
339 | NOWAIT non-nil means this client is not waiting for the results, |
340 | so don't mark these buffers specially, just visit them normally." | |
e82e73c2 | 341 | ;; Bind last-nonmenu-event to force use of keyboard, not mouse, for queries. |
44a56b29 | 342 | (let ((last-nonmenu-event t) client-record) |
3a0ce849 RS |
343 | ;; Restore the current buffer afterward, but not using save-excursion, |
344 | ;; because we don't want to save point in this buffer | |
345 | ;; if it happens to be one of those specified by the server. | |
44a56b29 SM |
346 | (save-current-buffer |
347 | (dolist (file files) | |
348 | ;; If there is an existing buffer modified or the file is | |
349 | ;; modified, revert it. If there is an existing buffer with | |
350 | ;; deleted file, offer to write it. | |
351 | (let* ((filen (car file)) | |
352 | (obuf (get-file-buffer filen))) | |
353 | (push filen file-name-history) | |
354 | (if (and obuf (set-buffer obuf)) | |
355 | (progn | |
356 | (cond ((file-exists-p filen) | |
357 | (if (not (verify-visited-file-modtime obuf)) | |
358 | (revert-buffer t nil))) | |
359 | (t | |
360 | (if (y-or-n-p | |
361 | (concat "File no longer exists: " | |
362 | filen | |
363 | ", write buffer to file? ")) | |
364 | (write-file filen)))) | |
365 | (setq server-existing-buffer t) | |
366 | (server-goto-line-column file)) | |
367 | (set-buffer (find-file-noselect filen)) | |
368 | (server-goto-line-column file) | |
369 | (run-hooks 'server-visit-hook))) | |
370 | (unless nowait | |
371 | ;; When the buffer is killed, inform the clients. | |
372 | (add-hook 'kill-buffer-hook 'server-kill-buffer nil t) | |
373 | (push (car client) server-buffer-clients)) | |
374 | (push (current-buffer) client-record))) | |
9ae0f972 | 375 | (nconc client client-record))) |
376 | \f | |
b392bac9 | 377 | (defun server-buffer-done (buffer &optional for-killing) |
9ae0f972 | 378 | "Mark BUFFER as \"done\" for its client(s). |
9184aafb RS |
379 | This buries the buffer, then returns a list of the form (NEXT-BUFFER KILLED). |
380 | NEXT-BUFFER is another server buffer, as a suggestion for what to select next, | |
8b3e840e SM |
381 | or nil. KILLED is t if we killed BUFFER (typically, because it was visiting |
382 | a temp file). | |
383 | FOR-KILLING if non-nil indicates that we are called from `kill-buffer'." | |
0c851d78 | 384 | (let ((next-buffer nil) |
9184aafb | 385 | (killed nil) |
9ae0f972 | 386 | (old-clients server-clients)) |
387 | (while old-clients | |
388 | (let ((client (car old-clients))) | |
8b3e840e | 389 | (or next-buffer |
9ae0f972 | 390 | (setq next-buffer (nth 1 (memq buffer client)))) |
391 | (delq buffer client) | |
68469f74 RS |
392 | ;; Delete all dead buffers from CLIENT. |
393 | (let ((tail client)) | |
394 | (while tail | |
395 | (and (bufferp (car tail)) | |
396 | (null (buffer-name (car tail))) | |
397 | (delq (car tail) client)) | |
398 | (setq tail (cdr tail)))) | |
9ae0f972 | 399 | ;; If client now has no pending buffers, |
400 | ;; tell it that it is done, and forget it entirely. | |
0c851d78 SM |
401 | (unless (cdr client) |
402 | (delete-process (car client)) | |
403 | (server-log "Close" (car client)) | |
9ae0f972 | 404 | (setq server-clients (delq client server-clients)))) |
405 | (setq old-clients (cdr old-clients))) | |
68469f74 | 406 | (if (and (bufferp buffer) (buffer-name buffer)) |
599f9a5c RS |
407 | ;; We may or may not kill this buffer; |
408 | ;; if we do, do not call server-buffer-done recursively | |
409 | ;; from kill-buffer-hook. | |
410 | (let ((server-kill-buffer-running t)) | |
faf931a8 RS |
411 | (save-excursion |
412 | (set-buffer buffer) | |
f9b3ef88 RS |
413 | (setq server-buffer-clients nil) |
414 | (run-hooks 'server-done-hook)) | |
599f9a5c RS |
415 | ;; Notice whether server-done-hook killed the buffer. |
416 | (if (null (buffer-name buffer)) | |
417 | (setq killed t) | |
418 | ;; Don't bother killing or burying the buffer | |
419 | ;; when we are called from kill-buffer. | |
420 | (unless for-killing | |
c6a117f0 GM |
421 | (when (and (not killed) |
422 | server-kill-new-buffers | |
4dd04714 RS |
423 | (with-current-buffer buffer |
424 | (not server-existing-buffer))) | |
c6a117f0 | 425 | (setq killed t) |
3d2a0e0b | 426 | (bury-buffer buffer) |
c6a117f0 GM |
427 | (kill-buffer buffer)) |
428 | (unless killed | |
429 | (if (server-temp-file-p buffer) | |
430 | (progn | |
431 | (kill-buffer buffer) | |
432 | (setq killed t)) | |
433 | (bury-buffer buffer))))))) | |
9184aafb | 434 | (list next-buffer killed))) |
9ae0f972 | 435 | |
436 | (defun server-temp-file-p (buffer) | |
437 | "Return non-nil if BUFFER contains a file considered temporary. | |
438 | These are files whose names suggest they are repeatedly | |
439 | reused to pass information to another program. | |
440 | ||
441 | The variable `server-temp-file-regexp' controls which filenames | |
442 | are considered temporary." | |
443 | (and (buffer-file-name buffer) | |
444 | (string-match server-temp-file-regexp (buffer-file-name buffer)))) | |
445 | ||
446 | (defun server-done () | |
cc9875f9 | 447 | "Offer to save current buffer, mark it as \"done\" for clients. |
ed9ae328 RS |
448 | This kills or buries the buffer, then returns a list |
449 | of the form (NEXT-BUFFER KILLED). NEXT-BUFFER is another server buffer, | |
450 | as a suggestion for what to select next, or nil. | |
451 | KILLED is t if we killed BUFFER, which happens if it was created | |
452 | specifically for the clients and did not exist before their request for it." | |
9ae0f972 | 453 | (let ((buffer (current-buffer))) |
454 | (if server-buffer-clients | |
c58bf9ae | 455 | (progn |
9ae0f972 | 456 | (if (server-temp-file-p buffer) |
991298c3 RS |
457 | ;; For a temp file, save, and do make a non-numeric backup |
458 | ;; (unless make-backup-files is nil). | |
459 | (let ((version-control nil) | |
460 | (buffer-backed-up nil)) | |
c58bf9ae | 461 | (save-buffer)) |
9ae0f972 | 462 | (if (and (buffer-modified-p) |
ffdd2796 | 463 | buffer-file-name |
9ae0f972 | 464 | (y-or-n-p (concat "Save file " buffer-file-name "? "))) |
ca0c7250 | 465 | (save-buffer))) |
c58bf9ae | 466 | (server-buffer-done buffer))))) |
faf931a8 | 467 | |
71207de2 RS |
468 | ;; Ask before killing a server buffer. |
469 | ;; It was suggested to release its client instead, | |
470 | ;; but I think that is dangerous--the client would proceed | |
471 | ;; using whatever is on disk in that file. -- rms. | |
03d78665 RS |
472 | (defun server-kill-buffer-query-function () |
473 | (or (not server-buffer-clients) | |
474 | (yes-or-no-p (format "Buffer `%s' still has clients; kill it? " | |
475 | (buffer-name (current-buffer)))))) | |
476 | ||
faf931a8 | 477 | (add-hook 'kill-buffer-query-functions |
03d78665 RS |
478 | 'server-kill-buffer-query-function) |
479 | ||
480 | (defun server-kill-emacs-query-function () | |
e82e73c2 RS |
481 | (let (live-client |
482 | (tail server-clients)) | |
483 | ;; See if any clients have any buffers that are still alive. | |
484 | (while tail | |
485 | (if (memq t (mapcar 'stringp (mapcar 'buffer-name (cdr (car tail))))) | |
486 | (setq live-client t)) | |
487 | (setq tail (cdr tail))) | |
488 | (or (not live-client) | |
489 | (yes-or-no-p "Server buffers still have clients; exit anyway? ")))) | |
03d78665 RS |
490 | |
491 | (add-hook 'kill-emacs-query-functions 'server-kill-emacs-query-function) | |
b392bac9 | 492 | |
fb873cfc | 493 | (defvar server-kill-buffer-running nil |
599f9a5c | 494 | "Non-nil while `server-kill-buffer' or `server-buffer-done' is running.") |
fb873cfc | 495 | |
b392bac9 | 496 | (defun server-kill-buffer () |
fb873cfc RS |
497 | ;; Prevent infinite recursion if user has made server-done-hook |
498 | ;; call kill-buffer. | |
499 | (or server-kill-buffer-running | |
599f9a5c RS |
500 | (and server-buffer-clients |
501 | (let ((server-kill-buffer-running t)) | |
502 | (when server-process | |
503 | (server-buffer-done (current-buffer) t)))))) | |
9ae0f972 | 504 | \f |
505 | (defun server-edit (&optional arg) | |
506 | "Switch to next server editing buffer; say \"Done\" for current buffer. | |
507 | If a server buffer is current, it is marked \"done\" and optionally saved. | |
ed9ae328 | 508 | The buffer is also killed if it did not exist before the clients asked for it. |
9ae0f972 | 509 | When all of a client's buffers are marked as \"done\", the client is notified. |
510 | ||
511 | Temporary files such as MH <draft> files are always saved and backed up, | |
991298c3 RS |
512 | no questions asked. (The variable `make-backup-files', if nil, still |
513 | inhibits a backup; you can set it locally in a particular buffer to | |
514 | prevent a backup for it.) The variable `server-temp-file-regexp' controls | |
9ae0f972 | 515 | which filenames are considered temporary. |
516 | ||
517 | If invoked with a prefix argument, or if there is no server process running, | |
518 | starts server process and that is all. Invoked by \\[server-edit]." | |
9ae0f972 | 519 | (interactive "P") |
520 | (if (or arg | |
521 | (not server-process) | |
522 | (memq (process-status server-process) '(signal exit))) | |
523 | (server-start nil) | |
9184aafb | 524 | (apply 'server-switch-buffer (server-done)))) |
9ae0f972 | 525 | |
98a4349c | 526 | (defun server-switch-buffer (&optional next-buffer killed-one) |
9ae0f972 | 527 | "Switch to another buffer, preferably one that has a client. |
528 | Arg NEXT-BUFFER is a suggestion; if it is a live buffer, use it." | |
9184aafb RS |
529 | ;; KILLED-ONE is t in a recursive call |
530 | ;; if we have already killed one temp-file server buffer. | |
531 | ;; This means we should avoid the final "switch to some other buffer" | |
532 | ;; since we've already effectively done that. | |
ca0c7250 SM |
533 | (if (null next-buffer) |
534 | (if server-clients | |
535 | (server-switch-buffer (nth 1 (car server-clients)) killed-one) | |
0c851d78 | 536 | (unless (or killed-one (window-dedicated-p (selected-window))) |
ca0c7250 SM |
537 | (switch-to-buffer (other-buffer)))) |
538 | (if (not (buffer-name next-buffer)) | |
539 | ;; If NEXT-BUFFER is a dead buffer, remove the server records for it | |
9ae0f972 | 540 | ;; and try the next surviving server buffer. |
ca0c7250 SM |
541 | (apply 'server-switch-buffer (server-buffer-done next-buffer)) |
542 | ;; OK, we know next-buffer is live, let's display and select it. | |
543 | (let ((win (get-buffer-window next-buffer 0))) | |
544 | (if (and win (not server-window)) | |
545 | ;; The buffer is already displayed: just reuse the window. | |
546 | (let ((frame (window-frame win))) | |
547 | (if (eq (frame-visible-p frame) 'icon) | |
548 | (raise-frame frame)) | |
549 | (select-window win) | |
550 | (set-buffer next-buffer)) | |
551 | ;; Otherwise, let's find an appropriate window. | |
552 | (cond ((and (windowp server-window) | |
553 | (window-live-p server-window)) | |
554 | (select-window server-window)) | |
555 | ((framep server-window) | |
556 | (if (not (frame-live-p server-window)) | |
557 | (setq server-window (make-frame))) | |
558 | (select-window (frame-selected-window server-window)))) | |
559 | (if (window-minibuffer-p (selected-window)) | |
560 | (select-window (next-window nil 'nomini 0))) | |
561 | ;; Move to a non-dedicated window, if we have one. | |
562 | (when (window-dedicated-p (selected-window)) | |
44a56b29 SM |
563 | (select-window |
564 | (get-window-with-predicate | |
565 | (lambda (w) | |
566 | (and (not (window-dedicated-p w)) | |
567 | (equal (frame-parameter (window-frame w) 'display) | |
568 | (frame-parameter (selected-frame) 'display)))) | |
569 | 'nomini 'visible (selected-window)))) | |
0c851d78 SM |
570 | (condition-case nil |
571 | (switch-to-buffer next-buffer) | |
572 | ;; After all the above, we might still have ended up with | |
573 | ;; a minibuffer/dedicated-window (if there's no other). | |
574 | (error (pop-to-buffer next-buffer)))))))) | |
9ae0f972 | 575 | |
576 | (global-set-key "\C-x#" 'server-edit) | |
df4e8a11 DL |
577 | |
578 | (defun server-unload-hook () | |
579 | (remove-hook 'kill-buffer-query-functions 'server-kill-buffer-query-function) | |
580 | (remove-hook 'kill-emacs-query-functions 'server-kill-emacs-query-function) | |
581 | (remove-hook 'kill-buffer-hook 'server-kill-buffer)) | |
16c15321 RM |
582 | \f |
583 | (provide 'server) | |
c88ab9ce ER |
584 | |
585 | ;;; server.el ends here |