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55535639 | 1 | ;;; server.el --- Lisp code for GNU Emacs running as server process |
c88ab9ce | 2 | |
0d30b337 | 3 | ;; Copyright (C) 1986, 1987, 1992, 1994, 1995, 1996, 1997, 1998, 1999, 2000, |
aaef169d | 4 | ;; 2001, 2002, 2003, 2004, 2005, 2006 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 | 25 | ;; along with GNU Emacs; see the file COPYING. If not, write to the |
086add15 LK |
26 | ;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, |
27 | ;; Boston, MA 02110-1301, 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 | 46 | ;; When you finish editing a Server buffer, again call server-edit |
64f51134 JPW |
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 | |
b578f267 | 49 | ;; and exited with server-edit, the client "editor" will return |
64f51134 | 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 | |
64f51134 JPW |
72 | ;; The buffer local variable "server-buffer-clients" lists |
73 | ;; the clients who are waiting for this buffer to be edited. | |
b578f267 EN |
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 | |
64f51134 JPW |
100 | (defvar server-process nil |
101 | "The current server process.") | |
9ae0f972 | 102 | |
103 | (defvar server-clients nil | |
104 | "List of current server clients. | |
e82e73c2 | 105 | Each element is (CLIENTID BUFFERS...) where CLIENTID is a string |
9ae0f972 | 106 | that can be given to the server process to identify a client. |
107 | When a buffer is marked as \"done\", it is removed from this list.") | |
108 | ||
109 | (defvar server-buffer-clients nil | |
b5a9911c | 110 | "List of client ids for clients requesting editing of current buffer.") |
faf931a8 | 111 | (make-variable-buffer-local 'server-buffer-clients) |
9ae0f972 | 112 | ;; Changing major modes should not erase this local. |
113 | (put 'server-buffer-clients 'permanent-local t) | |
114 | ||
33186f32 DL |
115 | (defcustom server-window nil |
116 | "*Specification of the window to use for selecting Emacs server buffers. | |
ec40ed9f | 117 | If nil, use the selected window. |
408784a7 | 118 | If it is a function, it should take one argument (a buffer) and |
33186f32 DL |
119 | display and select it. A common value is `pop-to-buffer'. |
120 | If it is a window, use that. | |
121 | If it is a frame, use the frame's selected window. | |
122 | ||
123 | It is not meaningful to set this to a specific frame or window with Custom. | |
124 | Only programs can do so." | |
125 | :group 'server | |
bf247b6e | 126 | :version "22.1" |
33186f32 DL |
127 | :type '(choice (const :tag "Use selected window" |
128 | :match (lambda (widget value) | |
129 | (not (functionp value))) | |
130 | nil) | |
131 | (function-item :tag "Use pop-to-buffer" pop-to-buffer) | |
132 | (function :tag "Other function"))) | |
ec40ed9f | 133 | |
ab1c7f35 | 134 | (defcustom server-temp-file-regexp "^/tmp/Re\\|/draft$" |
33186f32 DL |
135 | "*Regexp matching names of temporary files. |
136 | These are deleted and reused after each edit by the programs that | |
137 | invoke the Emacs server." | |
ab1c7f35 RS |
138 | :group 'server |
139 | :type 'regexp) | |
9ae0f972 | 140 | |
c6a117f0 GM |
141 | (defcustom server-kill-new-buffers t |
142 | "*Whether to kill buffers when done with them. | |
143 | If non-nil, kill a buffer unless it already existed before editing | |
64f51134 | 144 | it with Emacs server. If nil, kill only buffers as specified by |
c6a117f0 GM |
145 | `server-temp-file-regexp'. |
146 | Please note that only buffers are killed that still have a client, | |
147 | i.e. buffers visited which \"emacsclient --no-wait\" are never killed in | |
148 | this way." | |
149 | :group 'server | |
150 | :type 'boolean | |
151 | :version "21.1") | |
152 | ||
9ae0f972 | 153 | (or (assq 'server-buffer-clients minor-mode-alist) |
154 | (setq minor-mode-alist (cons '(server-buffer-clients " Server") minor-mode-alist))) | |
155 | ||
c6a117f0 | 156 | (defvar server-existing-buffer nil |
ca0c7250 | 157 | "Non-nil means the buffer existed before the server was asked to visit it. |
4dd04714 | 158 | This means that the server should not kill the buffer when you say you |
ca0c7250 | 159 | are done with it in the server.") |
c6a117f0 GM |
160 | (make-variable-buffer-local 'server-existing-buffer) |
161 | ||
03ae35cf SM |
162 | (defvar server-name "server") |
163 | ||
164 | (defvar server-socket-dir | |
165 | (format "/tmp/emacs%d" (user-uid))) | |
0c851d78 | 166 | |
8b3e840e | 167 | (defun server-log (string &optional client) |
33186f32 | 168 | "If a *server* buffer exists, write STRING to it for logging purposes." |
9ae0f972 | 169 | (if (get-buffer "*server*") |
8b3e840e | 170 | (with-current-buffer "*server*" |
9ae0f972 | 171 | (goto-char (point-max)) |
8b3e840e | 172 | (insert (current-time-string) |
0c851d78 | 173 | (if client (format " %s:" client) " ") |
8b3e840e | 174 | string) |
74c20cd3 | 175 | (or (bolp) (newline))))) |
9ae0f972 | 176 | |
177 | (defun server-sentinel (proc msg) | |
408784a7 | 178 | (let ((client (assq proc server-clients))) |
0c851d78 | 179 | ;; Remove PROC from the list of clients. |
408784a7 SM |
180 | (when client |
181 | (setq server-clients (delq client server-clients)) | |
182 | (dolist (buf (cdr client)) | |
183 | (with-current-buffer buf | |
184 | ;; Remove PROC from the clients of each buffer. | |
185 | (setq server-buffer-clients (delq proc server-buffer-clients)) | |
186 | ;; Kill the buffer if necessary. | |
187 | (when (and (null server-buffer-clients) | |
188 | (or (and server-kill-new-buffers | |
189 | (not server-existing-buffer)) | |
190 | (server-temp-file-p))) | |
191 | (kill-buffer (current-buffer))))))) | |
cbfc02e4 RF |
192 | ;; If this is a new client process, set the query-on-exit flag to nil |
193 | ;; for this process (it isn't inherited from the server process). | |
194 | (when (and (eq (process-status proc) 'open) | |
195 | (process-query-on-exit-flag proc)) | |
196 | (set-process-query-on-exit-flag proc nil)) | |
0c851d78 SM |
197 | (server-log (format "Status changed to %s" (process-status proc)) proc)) |
198 | ||
44a56b29 SM |
199 | (defun server-select-display (display) |
200 | ;; If the current frame is on `display' we're all set. | |
201 | (unless (equal (frame-parameter (selected-frame) 'display) display) | |
202 | ;; Otherwise, look for an existing frame there and select it. | |
203 | (dolist (frame (frame-list)) | |
204 | (when (equal (frame-parameter frame 'display) display) | |
205 | (select-frame frame))) | |
206 | ;; If there's no frame on that display yet, create a dummy one | |
207 | ;; and select it. | |
208 | (unless (equal (frame-parameter (selected-frame) 'display) display) | |
209 | (select-frame | |
210 | (make-frame-on-display | |
211 | display | |
212 | ;; This frame is only there in place of an actual "current display" | |
213 | ;; setting, so we want it to be as unobtrusive as possible. That's | |
214 | ;; what the invisibility is for. The minibuffer setting is so that | |
215 | ;; we don't end up displaying a buffer in it (which noone would | |
216 | ;; notice). | |
217 | '((visibility . nil) (minibuffer . only))))))) | |
218 | ||
0c851d78 SM |
219 | (defun server-unquote-arg (arg) |
220 | (replace-regexp-in-string | |
221 | "&." (lambda (s) | |
222 | (case (aref s 1) | |
223 | (?& "&") | |
224 | (?- "-") | |
225 | (?n "\n") | |
226 | (t " "))) | |
227 | arg t t)) | |
9ae0f972 | 228 | |
724629d2 SM |
229 | (defun server-ensure-safe-dir (dir) |
230 | "Make sure DIR is a directory with no race-condition issues. | |
231 | Creates the directory if necessary and makes sure: | |
232 | - there's no symlink involved | |
233 | - it's owned by us | |
234 | - it's not readable/writable by anybody else." | |
235 | (setq dir (directory-file-name dir)) | |
236 | (let ((attrs (file-attributes dir))) | |
237 | (unless attrs | |
238 | (letf (((default-file-modes) ?\700)) (make-directory dir)) | |
239 | (setq attrs (file-attributes dir))) | |
240 | ;; Check that it's safe for use. | |
241 | (unless (and (eq t (car attrs)) (eq (nth 2 attrs) (user-uid)) | |
242 | (zerop (logand ?\077 (file-modes dir)))) | |
243 | (error "The directory %s is unsafe" dir)))) | |
244 | ||
7229064d | 245 | ;;;###autoload |
9ae0f972 | 246 | (defun server-start (&optional leave-dead) |
247 | "Allow this Emacs process to be a server for client processes. | |
248 | This starts a server communications subprocess through which | |
249 | client \"editors\" can send your editing commands to this Emacs job. | |
42bbacdf | 250 | To use the server, set up the program `emacsclient' in the |
9ae0f972 | 251 | Emacs distribution as your standard \"editor\". |
252 | ||
253 | Prefix arg means just kill any existing server communications subprocess." | |
254 | (interactive "P") | |
724629d2 | 255 | ;; Make sure there is a safe directory in which to place the socket. |
03ae35cf | 256 | (server-ensure-safe-dir server-socket-dir) |
9ae0f972 | 257 | ;; kill it dead! |
60f8ea53 JPW |
258 | (if server-process |
259 | (condition-case () (delete-process server-process) (error nil))) | |
c1148e39 | 260 | ;; Delete the socket files made by previous server invocations. |
03ae35cf SM |
261 | (condition-case () |
262 | (delete-file (expand-file-name server-name server-socket-dir)) | |
263 | (error nil)) | |
c1148e39 | 264 | ;; If this Emacs already had a server, clear out associated status. |
9ae0f972 | 265 | (while server-clients |
266 | (let ((buffer (nth 1 (car server-clients)))) | |
267 | (server-buffer-done buffer))) | |
8b3e840e | 268 | (unless leave-dead |
9ae0f972 | 269 | (if server-process |
270 | (server-log (message "Restarting server"))) | |
e5576936 SM |
271 | (letf (((default-file-modes) ?\700)) |
272 | (setq server-process | |
273 | (make-network-process | |
274 | :name "server" :family 'local :server t :noquery t | |
03ae35cf | 275 | :service (expand-file-name server-name server-socket-dir) |
e5576936 SM |
276 | :sentinel 'server-sentinel :filter 'server-process-filter |
277 | ;; We must receive file names without being decoded. | |
278 | ;; Those are decoded by server-process-filter according | |
279 | ;; to file-name-coding-system. | |
280 | :coding 'raw-text))))) | |
33186f32 DL |
281 | |
282 | ;;;###autoload | |
283 | (define-minor-mode server-mode | |
284 | "Toggle Server mode. | |
285 | With ARG, turn Server mode on if ARG is positive, off otherwise. | |
286 | Server mode runs a process that accepts commands from the | |
287 | `emacsclient' program. See `server-start' and Info node `Emacs server'." | |
288 | :global t | |
289 | :group 'server | |
bf247b6e | 290 | :version "22.1" |
33186f32 DL |
291 | ;; Fixme: Should this check for an existing server socket and do |
292 | ;; nothing if there is one (for multiple Emacs sessions)? | |
293 | (server-start (not server-mode))) | |
9ae0f972 | 294 | \f |
9ae0f972 | 295 | (defun server-process-filter (proc string) |
33186f32 DL |
296 | "Process a request from the server to edit some files. |
297 | PROC is the server process. Format of STRING is \"PATH PATH PATH... \\n\"." | |
0c851d78 | 298 | (server-log string proc) |
3f7ef08e SM |
299 | (let ((prev (process-get proc 'previous-string))) |
300 | (when prev | |
301 | (setq string (concat prev string)) | |
302 | (process-put proc 'previous-string nil))) | |
68469f74 RS |
303 | ;; If the input is multiple lines, |
304 | ;; process each line individually. | |
305 | (while (string-match "\n" string) | |
306 | (let ((request (substring string 0 (match-beginning 0))) | |
6b7430a8 KH |
307 | (coding-system (and default-enable-multibyte-characters |
308 | (or file-name-coding-system | |
309 | default-file-name-coding-system))) | |
44a56b29 | 310 | client nowait eval |
9ae0f972 | 311 | (files nil) |
8c493570 | 312 | (lineno 1) |
5b421c81 | 313 | (tmp-frame nil) ; Sometimes used to embody the selected display. |
8c493570 | 314 | (columnno 0)) |
68469f74 | 315 | ;; Remove this line from STRING. |
0c851d78 SM |
316 | (setq string (substring string (match-end 0))) |
317 | (setq client (cons proc nil)) | |
318 | (while (string-match "[^ ]* " request) | |
724629d2 | 319 | (let ((arg (substring request (match-beginning 0) (1- (match-end 0))))) |
0c851d78 SM |
320 | (setq request (substring request (match-end 0))) |
321 | (cond | |
322 | ((equal "-nowait" arg) (setq nowait t)) | |
724629d2 | 323 | ((equal "-eval" arg) (setq eval t)) |
44a56b29 SM |
324 | ((and (equal "-display" arg) (string-match "\\([^ ]*\\) " request)) |
325 | (let ((display (server-unquote-arg (match-string 1 request)))) | |
326 | (setq request (substring request (match-end 0))) | |
327 | (condition-case err | |
5b421c81 | 328 | (setq tmp-frame (server-select-display display)) |
44a56b29 SM |
329 | (error (process-send-string proc (nth 1 err)) |
330 | (setq request ""))))) | |
0c851d78 SM |
331 | ;; ARG is a line number option. |
332 | ((string-match "\\`\\+[0-9]+\\'" arg) | |
027a4b6b | 333 | (setq lineno (string-to-number (substring arg 1)))) |
0c851d78 SM |
334 | ;; ARG is line number:column option. |
335 | ((string-match "\\`+\\([0-9]+\\):\\([0-9]+\\)\\'" arg) | |
027a4b6b JB |
336 | (setq lineno (string-to-number (match-string 1 arg)) |
337 | columnno (string-to-number (match-string 2 arg)))) | |
0c851d78 SM |
338 | (t |
339 | ;; Undo the quoting that emacsclient does | |
340 | ;; for certain special characters. | |
341 | (setq arg (server-unquote-arg arg)) | |
342 | ;; Now decode the file name if necessary. | |
343 | (if coding-system | |
344 | (setq arg (decode-coding-string arg coding-system))) | |
44a56b29 SM |
345 | (if eval |
346 | (let ((v (eval (car (read-from-string arg))))) | |
347 | (when v | |
348 | (with-temp-buffer | |
349 | (let ((standard-output (current-buffer))) | |
350 | (pp v) | |
9afed9b1 MY |
351 | ;; Suppress the error rose when the pipe to PROC is closed. |
352 | (condition-case err | |
353 | (process-send-region proc (point-min) (point-max)) | |
51b4073a MY |
354 | (file-error nil) |
355 | (error nil)) | |
9afed9b1 | 356 | )))) |
44a56b29 SM |
357 | ;; ARG is a file name. |
358 | ;; Collapse multiple slashes to single slashes. | |
359 | (setq arg (command-line-normalize-file-name arg)) | |
360 | (push (list arg lineno columnno) files)) | |
0c851d78 SM |
361 | (setq lineno 1) |
362 | (setq columnno 0))))) | |
363 | (when files | |
364 | (run-hooks 'pre-command-hook) | |
365 | (server-visit-files files client nowait) | |
366 | (run-hooks 'post-command-hook)) | |
367 | ;; CLIENT is now a list (CLIENTNUM BUFFERS...) | |
368 | (if (null (cdr client)) | |
369 | ;; This client is empty; get rid of it immediately. | |
370 | (progn | |
371 | (delete-process proc) | |
372 | (server-log "Close empty client" proc)) | |
373 | ;; We visited some buffer for this client. | |
374 | (or nowait (push client server-clients)) | |
64f51134 | 375 | (unless (or isearch-mode (minibufferp)) |
cf1175df RS |
376 | (server-switch-buffer (nth 1 client)) |
377 | (run-hooks 'server-switch-hook) | |
378 | (unless nowait | |
8a26c165 | 379 | (message "%s" (substitute-command-keys |
5b421c81 SM |
380 | "When done with a buffer, type \\[server-edit]"))))) |
381 | ;; Avoid preserving the connection after the last real frame is deleted. | |
382 | (if tmp-frame (delete-frame tmp-frame)))) | |
68469f74 | 383 | ;; Save for later any partial line that remains. |
0c851d78 | 384 | (when (> (length string) 0) |
3f7ef08e | 385 | (process-put proc 'previous-string string))) |
9ae0f972 | 386 | |
6b98185f RS |
387 | (defun server-goto-line-column (file-line-col) |
388 | (goto-line (nth 1 file-line-col)) | |
389 | (let ((column-number (nth 2 file-line-col))) | |
390 | (if (> column-number 0) | |
391 | (move-to-column (1- column-number))))) | |
392 | ||
dfa35e6b | 393 | (defun server-visit-files (files client &optional nowait) |
44a56b29 | 394 | "Find FILES and return the list CLIENT with the buffers nconc'd. |
8c493570 | 395 | FILES is an alist whose elements are (FILENAME LINENUMBER COLUMNNUMBER). |
dfa35e6b RS |
396 | NOWAIT non-nil means this client is not waiting for the results, |
397 | so don't mark these buffers specially, just visit them normally." | |
e82e73c2 | 398 | ;; Bind last-nonmenu-event to force use of keyboard, not mouse, for queries. |
44a56b29 | 399 | (let ((last-nonmenu-event t) client-record) |
3a0ce849 RS |
400 | ;; Restore the current buffer afterward, but not using save-excursion, |
401 | ;; because we don't want to save point in this buffer | |
402 | ;; if it happens to be one of those specified by the server. | |
44a56b29 SM |
403 | (save-current-buffer |
404 | (dolist (file files) | |
405 | ;; If there is an existing buffer modified or the file is | |
406 | ;; modified, revert it. If there is an existing buffer with | |
407 | ;; deleted file, offer to write it. | |
408 | (let* ((filen (car file)) | |
409 | (obuf (get-file-buffer filen))) | |
410 | (push filen file-name-history) | |
411 | (if (and obuf (set-buffer obuf)) | |
412 | (progn | |
413 | (cond ((file-exists-p filen) | |
414 | (if (not (verify-visited-file-modtime obuf)) | |
415 | (revert-buffer t nil))) | |
416 | (t | |
417 | (if (y-or-n-p | |
418 | (concat "File no longer exists: " | |
419 | filen | |
420 | ", write buffer to file? ")) | |
421 | (write-file filen)))) | |
422 | (setq server-existing-buffer t) | |
423 | (server-goto-line-column file)) | |
424 | (set-buffer (find-file-noselect filen)) | |
425 | (server-goto-line-column file) | |
426 | (run-hooks 'server-visit-hook))) | |
427 | (unless nowait | |
428 | ;; When the buffer is killed, inform the clients. | |
429 | (add-hook 'kill-buffer-hook 'server-kill-buffer nil t) | |
430 | (push (car client) server-buffer-clients)) | |
431 | (push (current-buffer) client-record))) | |
9ae0f972 | 432 | (nconc client client-record))) |
433 | \f | |
b392bac9 | 434 | (defun server-buffer-done (buffer &optional for-killing) |
9ae0f972 | 435 | "Mark BUFFER as \"done\" for its client(s). |
9184aafb RS |
436 | This buries the buffer, then returns a list of the form (NEXT-BUFFER KILLED). |
437 | NEXT-BUFFER is another server buffer, as a suggestion for what to select next, | |
8b3e840e SM |
438 | or nil. KILLED is t if we killed BUFFER (typically, because it was visiting |
439 | a temp file). | |
440 | FOR-KILLING if non-nil indicates that we are called from `kill-buffer'." | |
0c851d78 | 441 | (let ((next-buffer nil) |
9184aafb | 442 | (killed nil) |
9ae0f972 | 443 | (old-clients server-clients)) |
444 | (while old-clients | |
445 | (let ((client (car old-clients))) | |
8b3e840e | 446 | (or next-buffer |
9ae0f972 | 447 | (setq next-buffer (nth 1 (memq buffer client)))) |
448 | (delq buffer client) | |
68469f74 RS |
449 | ;; Delete all dead buffers from CLIENT. |
450 | (let ((tail client)) | |
451 | (while tail | |
452 | (and (bufferp (car tail)) | |
453 | (null (buffer-name (car tail))) | |
454 | (delq (car tail) client)) | |
455 | (setq tail (cdr tail)))) | |
9ae0f972 | 456 | ;; If client now has no pending buffers, |
457 | ;; tell it that it is done, and forget it entirely. | |
0c851d78 SM |
458 | (unless (cdr client) |
459 | (delete-process (car client)) | |
460 | (server-log "Close" (car client)) | |
9ae0f972 | 461 | (setq server-clients (delq client server-clients)))) |
462 | (setq old-clients (cdr old-clients))) | |
68469f74 | 463 | (if (and (bufferp buffer) (buffer-name buffer)) |
599f9a5c RS |
464 | ;; We may or may not kill this buffer; |
465 | ;; if we do, do not call server-buffer-done recursively | |
466 | ;; from kill-buffer-hook. | |
467 | (let ((server-kill-buffer-running t)) | |
408784a7 | 468 | (with-current-buffer buffer |
f9b3ef88 RS |
469 | (setq server-buffer-clients nil) |
470 | (run-hooks 'server-done-hook)) | |
599f9a5c RS |
471 | ;; Notice whether server-done-hook killed the buffer. |
472 | (if (null (buffer-name buffer)) | |
473 | (setq killed t) | |
474 | ;; Don't bother killing or burying the buffer | |
475 | ;; when we are called from kill-buffer. | |
476 | (unless for-killing | |
c6a117f0 GM |
477 | (when (and (not killed) |
478 | server-kill-new-buffers | |
4dd04714 RS |
479 | (with-current-buffer buffer |
480 | (not server-existing-buffer))) | |
c6a117f0 | 481 | (setq killed t) |
3d2a0e0b | 482 | (bury-buffer buffer) |
c6a117f0 GM |
483 | (kill-buffer buffer)) |
484 | (unless killed | |
485 | (if (server-temp-file-p buffer) | |
486 | (progn | |
487 | (kill-buffer buffer) | |
488 | (setq killed t)) | |
489 | (bury-buffer buffer))))))) | |
9184aafb | 490 | (list next-buffer killed))) |
9ae0f972 | 491 | |
408784a7 | 492 | (defun server-temp-file-p (&optional buffer) |
9ae0f972 | 493 | "Return non-nil if BUFFER contains a file considered temporary. |
494 | These are files whose names suggest they are repeatedly | |
495 | reused to pass information to another program. | |
496 | ||
497 | The variable `server-temp-file-regexp' controls which filenames | |
498 | are considered temporary." | |
499 | (and (buffer-file-name buffer) | |
500 | (string-match server-temp-file-regexp (buffer-file-name buffer)))) | |
501 | ||
502 | (defun server-done () | |
cc9875f9 | 503 | "Offer to save current buffer, mark it as \"done\" for clients. |
ed9ae328 RS |
504 | This kills or buries the buffer, then returns a list |
505 | of the form (NEXT-BUFFER KILLED). NEXT-BUFFER is another server buffer, | |
506 | as a suggestion for what to select next, or nil. | |
507 | KILLED is t if we killed BUFFER, which happens if it was created | |
508 | specifically for the clients and did not exist before their request for it." | |
408784a7 SM |
509 | (when server-buffer-clients |
510 | (if (server-temp-file-p) | |
511 | ;; For a temp file, save, and do make a non-numeric backup | |
512 | ;; (unless make-backup-files is nil). | |
513 | (let ((version-control nil) | |
514 | (buffer-backed-up nil)) | |
515 | (save-buffer)) | |
516 | (if (and (buffer-modified-p) | |
517 | buffer-file-name | |
518 | (y-or-n-p (concat "Save file " buffer-file-name "? "))) | |
519 | (save-buffer))) | |
520 | (server-buffer-done (current-buffer)))) | |
faf931a8 | 521 | |
71207de2 RS |
522 | ;; Ask before killing a server buffer. |
523 | ;; It was suggested to release its client instead, | |
524 | ;; but I think that is dangerous--the client would proceed | |
525 | ;; using whatever is on disk in that file. -- rms. | |
03d78665 RS |
526 | (defun server-kill-buffer-query-function () |
527 | (or (not server-buffer-clients) | |
528 | (yes-or-no-p (format "Buffer `%s' still has clients; kill it? " | |
529 | (buffer-name (current-buffer)))))) | |
530 | ||
faf931a8 | 531 | (add-hook 'kill-buffer-query-functions |
03d78665 RS |
532 | 'server-kill-buffer-query-function) |
533 | ||
534 | (defun server-kill-emacs-query-function () | |
e82e73c2 RS |
535 | (let (live-client |
536 | (tail server-clients)) | |
537 | ;; See if any clients have any buffers that are still alive. | |
538 | (while tail | |
539 | (if (memq t (mapcar 'stringp (mapcar 'buffer-name (cdr (car tail))))) | |
540 | (setq live-client t)) | |
541 | (setq tail (cdr tail))) | |
542 | (or (not live-client) | |
543 | (yes-or-no-p "Server buffers still have clients; exit anyway? ")))) | |
03d78665 RS |
544 | |
545 | (add-hook 'kill-emacs-query-functions 'server-kill-emacs-query-function) | |
b392bac9 | 546 | |
fb873cfc | 547 | (defvar server-kill-buffer-running nil |
599f9a5c | 548 | "Non-nil while `server-kill-buffer' or `server-buffer-done' is running.") |
fb873cfc | 549 | |
b392bac9 | 550 | (defun server-kill-buffer () |
fb873cfc RS |
551 | ;; Prevent infinite recursion if user has made server-done-hook |
552 | ;; call kill-buffer. | |
553 | (or server-kill-buffer-running | |
599f9a5c RS |
554 | (and server-buffer-clients |
555 | (let ((server-kill-buffer-running t)) | |
556 | (when server-process | |
557 | (server-buffer-done (current-buffer) t)))))) | |
9ae0f972 | 558 | \f |
559 | (defun server-edit (&optional arg) | |
560 | "Switch to next server editing buffer; say \"Done\" for current buffer. | |
561 | If a server buffer is current, it is marked \"done\" and optionally saved. | |
ed9ae328 | 562 | The buffer is also killed if it did not exist before the clients asked for it. |
9ae0f972 | 563 | When all of a client's buffers are marked as \"done\", the client is notified. |
564 | ||
565 | Temporary files such as MH <draft> files are always saved and backed up, | |
991298c3 RS |
566 | no questions asked. (The variable `make-backup-files', if nil, still |
567 | inhibits a backup; you can set it locally in a particular buffer to | |
568 | prevent a backup for it.) The variable `server-temp-file-regexp' controls | |
9ae0f972 | 569 | which filenames are considered temporary. |
570 | ||
64f51134 | 571 | If invoked with a prefix argument, or if there is no server process running, |
9ae0f972 | 572 | starts server process and that is all. Invoked by \\[server-edit]." |
9ae0f972 | 573 | (interactive "P") |
574 | (if (or arg | |
575 | (not server-process) | |
576 | (memq (process-status server-process) '(signal exit))) | |
577 | (server-start nil) | |
9184aafb | 578 | (apply 'server-switch-buffer (server-done)))) |
9ae0f972 | 579 | |
98a4349c | 580 | (defun server-switch-buffer (&optional next-buffer killed-one) |
9ae0f972 | 581 | "Switch to another buffer, preferably one that has a client. |
582 | Arg NEXT-BUFFER is a suggestion; if it is a live buffer, use it." | |
9184aafb RS |
583 | ;; KILLED-ONE is t in a recursive call |
584 | ;; if we have already killed one temp-file server buffer. | |
585 | ;; This means we should avoid the final "switch to some other buffer" | |
586 | ;; since we've already effectively done that. | |
ca0c7250 SM |
587 | (if (null next-buffer) |
588 | (if server-clients | |
589 | (server-switch-buffer (nth 1 (car server-clients)) killed-one) | |
0c851d78 | 590 | (unless (or killed-one (window-dedicated-p (selected-window))) |
90ee5627 RS |
591 | (switch-to-buffer (other-buffer)) |
592 | (message "No server buffers remain to edit"))) | |
ca0c7250 SM |
593 | (if (not (buffer-name next-buffer)) |
594 | ;; If NEXT-BUFFER is a dead buffer, remove the server records for it | |
9ae0f972 | 595 | ;; and try the next surviving server buffer. |
ca0c7250 SM |
596 | (apply 'server-switch-buffer (server-buffer-done next-buffer)) |
597 | ;; OK, we know next-buffer is live, let's display and select it. | |
408784a7 SM |
598 | (if (functionp server-window) |
599 | (funcall server-window next-buffer) | |
600 | (let ((win (get-buffer-window next-buffer 0))) | |
601 | (if (and win (not server-window)) | |
602 | ;; The buffer is already displayed: just reuse the window. | |
603 | (let ((frame (window-frame win))) | |
604 | (if (eq (frame-visible-p frame) 'icon) | |
605 | (raise-frame frame)) | |
606 | (select-window win) | |
607 | (set-buffer next-buffer)) | |
608 | ;; Otherwise, let's find an appropriate window. | |
609 | (cond ((and (windowp server-window) | |
610 | (window-live-p server-window)) | |
611 | (select-window server-window)) | |
612 | ((framep server-window) | |
613 | (if (not (frame-live-p server-window)) | |
614 | (setq server-window (make-frame))) | |
615 | (select-window (frame-selected-window server-window)))) | |
616 | (if (window-minibuffer-p (selected-window)) | |
617 | (select-window (next-window nil 'nomini 0))) | |
618 | ;; Move to a non-dedicated window, if we have one. | |
619 | (when (window-dedicated-p (selected-window)) | |
620 | (select-window | |
621 | (get-window-with-predicate | |
622 | (lambda (w) | |
623 | (and (not (window-dedicated-p w)) | |
624 | (equal (frame-parameter (window-frame w) 'display) | |
625 | (frame-parameter (selected-frame) 'display)))) | |
626 | 'nomini 'visible (selected-window)))) | |
627 | (condition-case nil | |
628 | (switch-to-buffer next-buffer) | |
629 | ;; After all the above, we might still have ended up with | |
630 | ;; a minibuffer/dedicated-window (if there's no other). | |
631 | (error (pop-to-buffer next-buffer))))))))) | |
9ae0f972 | 632 | |
772c5eb7 | 633 | (define-key ctl-x-map "#" 'server-edit) |
df4e8a11 DL |
634 | |
635 | (defun server-unload-hook () | |
33186f32 | 636 | (server-start t) |
df4e8a11 DL |
637 | (remove-hook 'kill-buffer-query-functions 'server-kill-buffer-query-function) |
638 | (remove-hook 'kill-emacs-query-functions 'server-kill-emacs-query-function) | |
639 | (remove-hook 'kill-buffer-hook 'server-kill-buffer)) | |
3bb38bc2 RS |
640 | |
641 | (add-hook 'server-unload-hook 'server-unload-hook) | |
16c15321 RM |
642 | \f |
643 | (provide 'server) | |
c88ab9ce | 644 | |
ab5796a9 | 645 | ;;; arch-tag: 1f7ecb42-f00a-49f8-906d-61995d84c8d6 |
c88ab9ce | 646 | ;;; server.el ends here |