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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 | ||
337e3c70 JB |
85 | (defcustom server-use-tcp nil |
86 | "If non-nil, use TCP sockets instead of local sockets." | |
87 | :set #'(lambda (sym val) | |
88 | (unless (featurep 'make-network-process '(:family local)) | |
89 | (setq val t) | |
90 | (unless load-in-progress | |
91 | (message "Local sockets unsupported, using TCP sockets"))) | |
92 | (when val (random t)) | |
93 | (set-default sym val)) | |
94 | :group 'server | |
95 | :type 'boolean | |
96 | :version "22.1") | |
97 | ||
98 | (defcustom server-host nil | |
99 | "The name or IP address to use as host address of the server process. | |
100 | If set, the server accepts remote connections; otherwise it is local." | |
101 | :group 'server | |
102 | :type '(choice | |
103 | (string :tag "Name or IP address") | |
104 | (const :tag "Local" nil)) | |
105 | :version "22.1") | |
106 | (put 'server-host 'risky-local-variable t) | |
107 | ||
108 | (defcustom server-auth-dir "~/.emacs.d/server/" | |
109 | "Directory for server authentication files." | |
110 | :group 'server | |
111 | :type 'directory | |
112 | :version "22.1") | |
113 | (put 'server-auth-dir 'risky-local-variable t) | |
114 | ||
90caccca JB |
115 | (defcustom server-raise-frame t |
116 | "*If non-nil, raise frame when switching to a buffer." | |
117 | :group 'server | |
118 | :type 'boolean | |
119 | :version "22.1") | |
120 | ||
ab1c7f35 | 121 | (defcustom server-visit-hook nil |
0c851d78 | 122 | "*Hook run when visiting a file for the Emacs server." |
ab1c7f35 | 123 | :group 'server |
0c851d78 | 124 | :type 'hook) |
ab1c7f35 RS |
125 | |
126 | (defcustom server-switch-hook nil | |
0c851d78 | 127 | "*Hook run when switching to a buffer for the Emacs server." |
ab1c7f35 | 128 | :group 'server |
0c851d78 | 129 | :type 'hook) |
ab1c7f35 RS |
130 | |
131 | (defcustom server-done-hook nil | |
0c851d78 | 132 | "*Hook run when done editing a buffer for the Emacs server." |
ab1c7f35 | 133 | :group 'server |
0c851d78 | 134 | :type 'hook) |
f9b3ef88 | 135 | |
64f51134 JPW |
136 | (defvar server-process nil |
137 | "The current server process.") | |
9ae0f972 | 138 | |
139 | (defvar server-clients nil | |
140 | "List of current server clients. | |
e82e73c2 | 141 | Each element is (CLIENTID BUFFERS...) where CLIENTID is a string |
9ae0f972 | 142 | that can be given to the server process to identify a client. |
143 | When a buffer is marked as \"done\", it is removed from this list.") | |
144 | ||
145 | (defvar server-buffer-clients nil | |
b5a9911c | 146 | "List of client ids for clients requesting editing of current buffer.") |
faf931a8 | 147 | (make-variable-buffer-local 'server-buffer-clients) |
9ae0f972 | 148 | ;; Changing major modes should not erase this local. |
149 | (put 'server-buffer-clients 'permanent-local t) | |
150 | ||
33186f32 DL |
151 | (defcustom server-window nil |
152 | "*Specification of the window to use for selecting Emacs server buffers. | |
ec40ed9f | 153 | If nil, use the selected window. |
408784a7 | 154 | If it is a function, it should take one argument (a buffer) and |
33186f32 DL |
155 | display and select it. A common value is `pop-to-buffer'. |
156 | If it is a window, use that. | |
157 | If it is a frame, use the frame's selected window. | |
158 | ||
159 | It is not meaningful to set this to a specific frame or window with Custom. | |
160 | Only programs can do so." | |
161 | :group 'server | |
bf247b6e | 162 | :version "22.1" |
33186f32 DL |
163 | :type '(choice (const :tag "Use selected window" |
164 | :match (lambda (widget value) | |
165 | (not (functionp value))) | |
166 | nil) | |
167 | (function-item :tag "Use pop-to-buffer" pop-to-buffer) | |
168 | (function :tag "Other function"))) | |
ec40ed9f | 169 | |
ab1c7f35 | 170 | (defcustom server-temp-file-regexp "^/tmp/Re\\|/draft$" |
33186f32 DL |
171 | "*Regexp matching names of temporary files. |
172 | These are deleted and reused after each edit by the programs that | |
173 | invoke the Emacs server." | |
ab1c7f35 RS |
174 | :group 'server |
175 | :type 'regexp) | |
9ae0f972 | 176 | |
c6a117f0 GM |
177 | (defcustom server-kill-new-buffers t |
178 | "*Whether to kill buffers when done with them. | |
179 | If non-nil, kill a buffer unless it already existed before editing | |
64f51134 | 180 | it with Emacs server. If nil, kill only buffers as specified by |
c6a117f0 GM |
181 | `server-temp-file-regexp'. |
182 | Please note that only buffers are killed that still have a client, | |
183 | i.e. buffers visited which \"emacsclient --no-wait\" are never killed in | |
184 | this way." | |
185 | :group 'server | |
186 | :type 'boolean | |
187 | :version "21.1") | |
188 | ||
9ae0f972 | 189 | (or (assq 'server-buffer-clients minor-mode-alist) |
b7621225 | 190 | (push '(server-buffer-clients " Server") minor-mode-alist)) |
9ae0f972 | 191 | |
c6a117f0 | 192 | (defvar server-existing-buffer nil |
ca0c7250 | 193 | "Non-nil means the buffer existed before the server was asked to visit it. |
4dd04714 | 194 | This means that the server should not kill the buffer when you say you |
ca0c7250 | 195 | are done with it in the server.") |
c6a117f0 GM |
196 | (make-variable-buffer-local 'server-existing-buffer) |
197 | ||
03ae35cf SM |
198 | (defvar server-name "server") |
199 | ||
200 | (defvar server-socket-dir | |
201 | (format "/tmp/emacs%d" (user-uid))) | |
0c851d78 | 202 | |
8b3e840e | 203 | (defun server-log (string &optional client) |
33186f32 | 204 | "If a *server* buffer exists, write STRING to it for logging purposes." |
337e3c70 JB |
205 | (when (get-buffer "*server*") |
206 | (with-current-buffer "*server*" | |
207 | (goto-char (point-max)) | |
208 | (insert (current-time-string) | |
209 | (if client (format " %s:" client) " ") | |
210 | string) | |
211 | (or (bolp) (newline))))) | |
9ae0f972 | 212 | |
213 | (defun server-sentinel (proc msg) | |
408784a7 | 214 | (let ((client (assq proc server-clients))) |
0c851d78 | 215 | ;; Remove PROC from the list of clients. |
408784a7 SM |
216 | (when client |
217 | (setq server-clients (delq client server-clients)) | |
218 | (dolist (buf (cdr client)) | |
219 | (with-current-buffer buf | |
220 | ;; Remove PROC from the clients of each buffer. | |
221 | (setq server-buffer-clients (delq proc server-buffer-clients)) | |
222 | ;; Kill the buffer if necessary. | |
223 | (when (and (null server-buffer-clients) | |
224 | (or (and server-kill-new-buffers | |
225 | (not server-existing-buffer)) | |
226 | (server-temp-file-p))) | |
227 | (kill-buffer (current-buffer))))))) | |
cbfc02e4 RF |
228 | ;; If this is a new client process, set the query-on-exit flag to nil |
229 | ;; for this process (it isn't inherited from the server process). | |
230 | (when (and (eq (process-status proc) 'open) | |
231 | (process-query-on-exit-flag proc)) | |
232 | (set-process-query-on-exit-flag proc nil)) | |
757e1681 SM |
233 | ;; Delete the associated connection file, if applicable. |
234 | ;; This is actually problematic: the file may have been overwritten by | |
235 | ;; another Emacs server in the mean time, so it's not ours any more. | |
236 | ;; (and (process-contact proc :server) | |
237 | ;; (eq (process-status proc) 'closed) | |
238 | ;; (ignore-errors (delete-file (process-get proc :server-file)))) | |
0c851d78 SM |
239 | (server-log (format "Status changed to %s" (process-status proc)) proc)) |
240 | ||
44a56b29 SM |
241 | (defun server-select-display (display) |
242 | ;; If the current frame is on `display' we're all set. | |
243 | (unless (equal (frame-parameter (selected-frame) 'display) display) | |
244 | ;; Otherwise, look for an existing frame there and select it. | |
245 | (dolist (frame (frame-list)) | |
246 | (when (equal (frame-parameter frame 'display) display) | |
247 | (select-frame frame))) | |
30088515 | 248 | ;; If there's no frame on that display yet, create and select one. |
44a56b29 | 249 | (unless (equal (frame-parameter (selected-frame) 'display) display) |
7acc677b SM |
250 | (let* ((buffer (generate-new-buffer " *server-dummy*")) |
251 | (frame (make-frame-on-display | |
252 | display | |
253 | ;; Make it display (and remember) some dummy buffer, so | |
254 | ;; we can detect later if the frame is in use or not. | |
255 | `((server-dummmy-buffer . ,buffer) | |
256 | ;; This frame may be deleted later (see | |
257 | ;; server-unselect-display) so we want it to be as | |
258 | ;; unobtrusive as possible. | |
259 | (visibility . nil))))) | |
260 | (select-frame frame) | |
261 | (set-window-buffer (selected-window) buffer))))) | |
262 | ||
263 | (defun server-unselect-display (frame) | |
264 | ;; If the temporary frame is in use (displays something real), make it | |
265 | ;; visible. If not (which can happen if the user's customizations call | |
266 | ;; pop-to-buffer etc.), delete it to avoid preserving the connection after | |
267 | ;; the last real frame is deleted. | |
268 | (if (and (eq (frame-first-window frame) | |
269 | (next-window (frame-first-window frame) 'nomini)) | |
270 | (eq (window-buffer (frame-first-window frame)) | |
271 | (frame-parameter frame 'server-dummy-buffer))) | |
272 | ;; The temp frame still only shows one buffer, and that is the | |
273 | ;; internal temp buffer. | |
274 | (delete-frame frame) | |
275 | (set-frame-parameter frame 'visibility t)) | |
276 | (kill-buffer (frame-parameter frame 'server-dummy-buffer)) | |
277 | (set-frame-parameter frame 'server-dummy-buffer nil)) | |
44a56b29 | 278 | |
0c851d78 SM |
279 | (defun server-unquote-arg (arg) |
280 | (replace-regexp-in-string | |
281 | "&." (lambda (s) | |
282 | (case (aref s 1) | |
283 | (?& "&") | |
284 | (?- "-") | |
285 | (?n "\n") | |
286 | (t " "))) | |
287 | arg t t)) | |
9ae0f972 | 288 | |
724629d2 SM |
289 | (defun server-ensure-safe-dir (dir) |
290 | "Make sure DIR is a directory with no race-condition issues. | |
291 | Creates the directory if necessary and makes sure: | |
292 | - there's no symlink involved | |
293 | - it's owned by us | |
294 | - it's not readable/writable by anybody else." | |
295 | (setq dir (directory-file-name dir)) | |
296 | (let ((attrs (file-attributes dir))) | |
297 | (unless attrs | |
337e3c70 | 298 | (letf (((default-file-modes) ?\700)) (make-directory dir t)) |
724629d2 SM |
299 | (setq attrs (file-attributes dir))) |
300 | ;; Check that it's safe for use. | |
301 | (unless (and (eq t (car attrs)) (eq (nth 2 attrs) (user-uid)) | |
337e3c70 JB |
302 | (or (eq system-type 'windows-nt) |
303 | (zerop (logand ?\077 (file-modes dir))))) | |
724629d2 SM |
304 | (error "The directory %s is unsafe" dir)))) |
305 | ||
7229064d | 306 | ;;;###autoload |
9ae0f972 | 307 | (defun server-start (&optional leave-dead) |
308 | "Allow this Emacs process to be a server for client processes. | |
309 | This starts a server communications subprocess through which | |
310 | client \"editors\" can send your editing commands to this Emacs job. | |
42bbacdf | 311 | To use the server, set up the program `emacsclient' in the |
9ae0f972 | 312 | Emacs distribution as your standard \"editor\". |
313 | ||
314 | Prefix arg means just kill any existing server communications subprocess." | |
315 | (interactive "P") | |
337e3c70 | 316 | (when server-process |
b7621225 | 317 | ;; kill it dead! |
757e1681 | 318 | (ignore-errors (delete-process server-process))) |
c1148e39 | 319 | ;; If this Emacs already had a server, clear out associated status. |
9ae0f972 | 320 | (while server-clients |
321 | (let ((buffer (nth 1 (car server-clients)))) | |
322 | (server-buffer-done buffer))) | |
2e8457a0 | 323 | ;; Now any previous server is properly stopped. |
8b3e840e | 324 | (unless leave-dead |
757e1681 SM |
325 | (let* ((server-dir (if server-use-tcp server-auth-dir server-socket-dir)) |
326 | (server-file (expand-file-name server-name server-dir))) | |
327 | ;; Make sure there is a safe directory in which to place the socket. | |
328 | (server-ensure-safe-dir server-dir) | |
329 | ;; Remove any leftover socket or authentication file. | |
330 | (ignore-errors (delete-file server-file)) | |
331 | (when server-process | |
332 | (server-log (message "Restarting server"))) | |
333 | (letf (((default-file-modes) ?\700)) | |
334 | (setq server-process | |
335 | (apply #'make-network-process | |
336 | :name server-name | |
337 | :server t | |
338 | :noquery t | |
339 | :sentinel 'server-sentinel | |
340 | :filter 'server-process-filter | |
341 | ;; We must receive file names without being decoded. | |
342 | ;; Those are decoded by server-process-filter according | |
343 | ;; to file-name-coding-system. | |
344 | :coding 'raw-text | |
345 | ;; The rest of the args depends on the kind of socket used. | |
346 | (if server-use-tcp | |
347 | (list :family nil | |
348 | :service t | |
349 | :host (or server-host 'local) | |
350 | :plist '(:authenticated nil)) | |
351 | (list :family 'local | |
352 | :service server-file | |
353 | :plist '(:authenticated t))))) | |
e101e718 JB |
354 | (unless server-process (error "Could not start server process")) |
355 | (when server-use-tcp | |
356 | (let ((auth-key | |
357 | (loop | |
358 | ;; The auth key is a 64-byte string of random chars in the | |
359 | ;; range `!'..`~'. | |
360 | for i below 64 | |
361 | collect (+ 33 (random 94)) into auth | |
362 | finally return (concat auth)))) | |
363 | (process-put server-process :auth-key auth-key) | |
364 | (with-temp-file server-file | |
365 | (set-buffer-multibyte nil) | |
366 | (setq buffer-file-coding-system 'no-conversion) | |
367 | (insert (format-network-address | |
368 | (process-contact server-process :local)) | |
c42690a6 | 369 | " " (int-to-string (emacs-pid)) |
e101e718 | 370 | "\n" auth-key)))))))) |
33186f32 DL |
371 | |
372 | ;;;###autoload | |
373 | (define-minor-mode server-mode | |
374 | "Toggle Server mode. | |
375 | With ARG, turn Server mode on if ARG is positive, off otherwise. | |
376 | Server mode runs a process that accepts commands from the | |
377 | `emacsclient' program. See `server-start' and Info node `Emacs server'." | |
378 | :global t | |
379 | :group 'server | |
bf247b6e | 380 | :version "22.1" |
33186f32 DL |
381 | ;; Fixme: Should this check for an existing server socket and do |
382 | ;; nothing if there is one (for multiple Emacs sessions)? | |
383 | (server-start (not server-mode))) | |
9ae0f972 | 384 | \f |
337e3c70 | 385 | (defun* server-process-filter (proc string) |
33186f32 DL |
386 | "Process a request from the server to edit some files. |
387 | PROC is the server process. Format of STRING is \"PATH PATH PATH... \\n\"." | |
337e3c70 JB |
388 | ;; First things first: let's check the authentication |
389 | (unless (process-get proc :authenticated) | |
390 | (if (and (string-match "-auth \\(.*?\\)\n" string) | |
757e1681 | 391 | (equal (match-string 1 string) (process-get proc :auth-key))) |
337e3c70 JB |
392 | (progn |
393 | (setq string (substring string (match-end 0))) | |
394 | (process-put proc :authenticated t) | |
395 | (server-log "Authentication successful" proc)) | |
396 | (server-log "Authentication failed" proc) | |
95eefb35 | 397 | (process-send-string proc "Authentication failed") |
337e3c70 JB |
398 | (delete-process proc) |
399 | ;; We return immediately | |
400 | (return-from server-process-filter))) | |
0c851d78 | 401 | (server-log string proc) |
337e3c70 | 402 | (let ((prev (process-get proc :previous-string))) |
3f7ef08e SM |
403 | (when prev |
404 | (setq string (concat prev string)) | |
337e3c70 | 405 | (process-put proc :previous-string nil))) |
68469f74 RS |
406 | ;; If the input is multiple lines, |
407 | ;; process each line individually. | |
408 | (while (string-match "\n" string) | |
409 | (let ((request (substring string 0 (match-beginning 0))) | |
6b7430a8 KH |
410 | (coding-system (and default-enable-multibyte-characters |
411 | (or file-name-coding-system | |
412 | default-file-name-coding-system))) | |
44a56b29 | 413 | client nowait eval |
9ae0f972 | 414 | (files nil) |
8c493570 | 415 | (lineno 1) |
337e3c70 | 416 | (tmp-frame nil) ;; Sometimes used to embody the selected display. |
8c493570 | 417 | (columnno 0)) |
68469f74 | 418 | ;; Remove this line from STRING. |
0c851d78 SM |
419 | (setq string (substring string (match-end 0))) |
420 | (setq client (cons proc nil)) | |
421 | (while (string-match "[^ ]* " request) | |
724629d2 | 422 | (let ((arg (substring request (match-beginning 0) (1- (match-end 0))))) |
0c851d78 SM |
423 | (setq request (substring request (match-end 0))) |
424 | (cond | |
95eefb35 JB |
425 | ((equal "-nowait" arg) (setq nowait t)) |
426 | ((equal "-eval" arg) (setq eval t)) | |
427 | ((and (equal "-display" arg) (string-match "\\([^ ]*\\) " request)) | |
428 | (let ((display (server-unquote-arg (match-string 1 request)))) | |
429 | (setq request (substring request (match-end 0))) | |
430 | (condition-case err | |
431 | (setq tmp-frame (server-select-display display)) | |
432 | (error (process-send-string proc (nth 1 err)) | |
433 | (setq request ""))))) | |
434 | ;; ARG is a line number option. | |
435 | ((string-match "\\`\\+[0-9]+\\'" arg) | |
436 | (setq lineno (string-to-number (substring arg 1)))) | |
437 | ;; ARG is line number:column option. | |
438 | ((string-match "\\`+\\([0-9]+\\):\\([0-9]+\\)\\'" arg) | |
439 | (setq lineno (string-to-number (match-string 1 arg)) | |
440 | columnno (string-to-number (match-string 2 arg)))) | |
441 | (t | |
442 | ;; Undo the quoting that emacsclient does | |
443 | ;; for certain special characters. | |
444 | (setq arg (server-unquote-arg arg)) | |
445 | ;; Now decode the file name if necessary. | |
446 | (when coding-system | |
447 | (setq arg (decode-coding-string arg coding-system))) | |
448 | (if eval | |
449 | (let* (errorp | |
450 | (v (condition-case errobj | |
451 | (eval (car (read-from-string arg))) | |
452 | (error (setq errorp t) errobj)))) | |
453 | (when v | |
454 | (with-temp-buffer | |
455 | (let ((standard-output (current-buffer))) | |
456 | (when errorp (princ "error: ")) | |
457 | (pp v) | |
458 | (ignore-errors | |
459 | (process-send-region proc (point-min) (point-max))) | |
460 | )))) | |
461 | ;; ARG is a file name. | |
462 | ;; Collapse multiple slashes to single slashes. | |
463 | (setq arg (command-line-normalize-file-name arg)) | |
464 | (push (list arg lineno columnno) files)) | |
465 | (setq lineno 1) | |
466 | (setq columnno 0))))) | |
0c851d78 SM |
467 | (when files |
468 | (run-hooks 'pre-command-hook) | |
469 | (server-visit-files files client nowait) | |
470 | (run-hooks 'post-command-hook)) | |
471 | ;; CLIENT is now a list (CLIENTNUM BUFFERS...) | |
472 | (if (null (cdr client)) | |
473 | ;; This client is empty; get rid of it immediately. | |
474 | (progn | |
475 | (delete-process proc) | |
476 | (server-log "Close empty client" proc)) | |
477 | ;; We visited some buffer for this client. | |
478 | (or nowait (push client server-clients)) | |
64f51134 | 479 | (unless (or isearch-mode (minibufferp)) |
cf1175df RS |
480 | (server-switch-buffer (nth 1 client)) |
481 | (run-hooks 'server-switch-hook) | |
482 | (unless nowait | |
8a26c165 | 483 | (message "%s" (substitute-command-keys |
95eefb35 | 484 | "When done with a buffer, type \\[server-edit]"))))) |
7acc677b SM |
485 | (when (frame-live-p tmp-frame) |
486 | ;; Delete tmp-frame or make it visible depending on whether it's | |
487 | ;; been used or not. | |
488 | (server-unselect-display tmp-frame)))) | |
68469f74 | 489 | ;; Save for later any partial line that remains. |
0c851d78 | 490 | (when (> (length string) 0) |
337e3c70 | 491 | (process-put proc :previous-string string))) |
9ae0f972 | 492 | |
6b98185f RS |
493 | (defun server-goto-line-column (file-line-col) |
494 | (goto-line (nth 1 file-line-col)) | |
495 | (let ((column-number (nth 2 file-line-col))) | |
337e3c70 JB |
496 | (when (> column-number 0) |
497 | (move-to-column (1- column-number))))) | |
6b98185f | 498 | |
dfa35e6b | 499 | (defun server-visit-files (files client &optional nowait) |
44a56b29 | 500 | "Find FILES and return the list CLIENT with the buffers nconc'd. |
8c493570 | 501 | FILES is an alist whose elements are (FILENAME LINENUMBER COLUMNNUMBER). |
dfa35e6b RS |
502 | NOWAIT non-nil means this client is not waiting for the results, |
503 | so don't mark these buffers specially, just visit them normally." | |
e82e73c2 | 504 | ;; Bind last-nonmenu-event to force use of keyboard, not mouse, for queries. |
44a56b29 | 505 | (let ((last-nonmenu-event t) client-record) |
3a0ce849 RS |
506 | ;; Restore the current buffer afterward, but not using save-excursion, |
507 | ;; because we don't want to save point in this buffer | |
508 | ;; if it happens to be one of those specified by the server. | |
44a56b29 SM |
509 | (save-current-buffer |
510 | (dolist (file files) | |
511 | ;; If there is an existing buffer modified or the file is | |
512 | ;; modified, revert it. If there is an existing buffer with | |
513 | ;; deleted file, offer to write it. | |
cd7320d4 JB |
514 | (let* ((minibuffer-auto-raise (or server-raise-frame |
515 | minibuffer-auto-raise)) | |
c2d0d432 | 516 | (filen (car file)) |
44a56b29 | 517 | (obuf (get-file-buffer filen))) |
c398358a | 518 | (add-to-history 'file-name-history filen) |
44a56b29 SM |
519 | (if (and obuf (set-buffer obuf)) |
520 | (progn | |
521 | (cond ((file-exists-p filen) | |
95eefb35 JB |
522 | (when (not (verify-visited-file-modtime obuf)) |
523 | (revert-buffer t nil))) | |
44a56b29 | 524 | (t |
95eefb35 JB |
525 | (when (y-or-n-p |
526 | (concat "File no longer exists: " | |
527 | filen | |
528 | ", write buffer to file? ")) | |
529 | (write-file filen)))) | |
44a56b29 SM |
530 | (setq server-existing-buffer t) |
531 | (server-goto-line-column file)) | |
532 | (set-buffer (find-file-noselect filen)) | |
533 | (server-goto-line-column file) | |
534 | (run-hooks 'server-visit-hook))) | |
535 | (unless nowait | |
536 | ;; When the buffer is killed, inform the clients. | |
537 | (add-hook 'kill-buffer-hook 'server-kill-buffer nil t) | |
538 | (push (car client) server-buffer-clients)) | |
539 | (push (current-buffer) client-record))) | |
9ae0f972 | 540 | (nconc client client-record))) |
541 | \f | |
b392bac9 | 542 | (defun server-buffer-done (buffer &optional for-killing) |
9ae0f972 | 543 | "Mark BUFFER as \"done\" for its client(s). |
9184aafb RS |
544 | This buries the buffer, then returns a list of the form (NEXT-BUFFER KILLED). |
545 | NEXT-BUFFER is another server buffer, as a suggestion for what to select next, | |
8b3e840e SM |
546 | or nil. KILLED is t if we killed BUFFER (typically, because it was visiting |
547 | a temp file). | |
548 | FOR-KILLING if non-nil indicates that we are called from `kill-buffer'." | |
0c851d78 | 549 | (let ((next-buffer nil) |
9184aafb | 550 | (killed nil) |
9ae0f972 | 551 | (old-clients server-clients)) |
552 | (while old-clients | |
553 | (let ((client (car old-clients))) | |
8b3e840e | 554 | (or next-buffer |
9ae0f972 | 555 | (setq next-buffer (nth 1 (memq buffer client)))) |
556 | (delq buffer client) | |
68469f74 RS |
557 | ;; Delete all dead buffers from CLIENT. |
558 | (let ((tail client)) | |
559 | (while tail | |
560 | (and (bufferp (car tail)) | |
561 | (null (buffer-name (car tail))) | |
562 | (delq (car tail) client)) | |
563 | (setq tail (cdr tail)))) | |
9ae0f972 | 564 | ;; If client now has no pending buffers, |
565 | ;; tell it that it is done, and forget it entirely. | |
0c851d78 SM |
566 | (unless (cdr client) |
567 | (delete-process (car client)) | |
568 | (server-log "Close" (car client)) | |
9ae0f972 | 569 | (setq server-clients (delq client server-clients)))) |
570 | (setq old-clients (cdr old-clients))) | |
337e3c70 JB |
571 | (when (and (bufferp buffer) (buffer-name buffer)) |
572 | ;; We may or may not kill this buffer; | |
573 | ;; if we do, do not call server-buffer-done recursively | |
574 | ;; from kill-buffer-hook. | |
575 | (let ((server-kill-buffer-running t)) | |
576 | (with-current-buffer buffer | |
577 | (setq server-buffer-clients nil) | |
578 | (run-hooks 'server-done-hook)) | |
579 | ;; Notice whether server-done-hook killed the buffer. | |
580 | (if (null (buffer-name buffer)) | |
581 | (setq killed t) | |
582 | ;; Don't bother killing or burying the buffer | |
583 | ;; when we are called from kill-buffer. | |
584 | (unless for-killing | |
585 | (when (and (not killed) | |
586 | server-kill-new-buffers | |
587 | (with-current-buffer buffer | |
588 | (not server-existing-buffer))) | |
599f9a5c | 589 | (setq killed t) |
337e3c70 JB |
590 | (bury-buffer buffer) |
591 | (kill-buffer buffer)) | |
592 | (unless killed | |
593 | (if (server-temp-file-p buffer) | |
594 | (progn | |
595 | (kill-buffer buffer) | |
596 | (setq killed t)) | |
597 | (bury-buffer buffer))))))) | |
9184aafb | 598 | (list next-buffer killed))) |
9ae0f972 | 599 | |
408784a7 | 600 | (defun server-temp-file-p (&optional buffer) |
9ae0f972 | 601 | "Return non-nil if BUFFER contains a file considered temporary. |
602 | These are files whose names suggest they are repeatedly | |
603 | reused to pass information to another program. | |
604 | ||
605 | The variable `server-temp-file-regexp' controls which filenames | |
606 | are considered temporary." | |
607 | (and (buffer-file-name buffer) | |
608 | (string-match server-temp-file-regexp (buffer-file-name buffer)))) | |
609 | ||
610 | (defun server-done () | |
cc9875f9 | 611 | "Offer to save current buffer, mark it as \"done\" for clients. |
ed9ae328 RS |
612 | This kills or buries the buffer, then returns a list |
613 | of the form (NEXT-BUFFER KILLED). NEXT-BUFFER is another server buffer, | |
614 | as a suggestion for what to select next, or nil. | |
615 | KILLED is t if we killed BUFFER, which happens if it was created | |
616 | specifically for the clients and did not exist before their request for it." | |
408784a7 SM |
617 | (when server-buffer-clients |
618 | (if (server-temp-file-p) | |
619 | ;; For a temp file, save, and do make a non-numeric backup | |
620 | ;; (unless make-backup-files is nil). | |
621 | (let ((version-control nil) | |
622 | (buffer-backed-up nil)) | |
623 | (save-buffer)) | |
337e3c70 JB |
624 | (when (and (buffer-modified-p) |
625 | buffer-file-name | |
626 | (y-or-n-p (concat "Save file " buffer-file-name "? "))) | |
627 | (save-buffer))) | |
408784a7 | 628 | (server-buffer-done (current-buffer)))) |
faf931a8 | 629 | |
71207de2 RS |
630 | ;; Ask before killing a server buffer. |
631 | ;; It was suggested to release its client instead, | |
632 | ;; but I think that is dangerous--the client would proceed | |
633 | ;; using whatever is on disk in that file. -- rms. | |
03d78665 RS |
634 | (defun server-kill-buffer-query-function () |
635 | (or (not server-buffer-clients) | |
636 | (yes-or-no-p (format "Buffer `%s' still has clients; kill it? " | |
637 | (buffer-name (current-buffer)))))) | |
638 | ||
faf931a8 | 639 | (add-hook 'kill-buffer-query-functions |
03d78665 RS |
640 | 'server-kill-buffer-query-function) |
641 | ||
642 | (defun server-kill-emacs-query-function () | |
e82e73c2 RS |
643 | (let (live-client |
644 | (tail server-clients)) | |
645 | ;; See if any clients have any buffers that are still alive. | |
646 | (while tail | |
337e3c70 JB |
647 | (when (memq t (mapcar 'stringp (mapcar 'buffer-name (cdr (car tail))))) |
648 | (setq live-client t)) | |
e82e73c2 RS |
649 | (setq tail (cdr tail))) |
650 | (or (not live-client) | |
651 | (yes-or-no-p "Server buffers still have clients; exit anyway? ")))) | |
03d78665 RS |
652 | |
653 | (add-hook 'kill-emacs-query-functions 'server-kill-emacs-query-function) | |
b392bac9 | 654 | |
fb873cfc | 655 | (defvar server-kill-buffer-running nil |
599f9a5c | 656 | "Non-nil while `server-kill-buffer' or `server-buffer-done' is running.") |
fb873cfc | 657 | |
b392bac9 | 658 | (defun server-kill-buffer () |
fb873cfc RS |
659 | ;; Prevent infinite recursion if user has made server-done-hook |
660 | ;; call kill-buffer. | |
661 | (or server-kill-buffer-running | |
599f9a5c RS |
662 | (and server-buffer-clients |
663 | (let ((server-kill-buffer-running t)) | |
664 | (when server-process | |
665 | (server-buffer-done (current-buffer) t)))))) | |
9ae0f972 | 666 | \f |
667 | (defun server-edit (&optional arg) | |
668 | "Switch to next server editing buffer; say \"Done\" for current buffer. | |
669 | If a server buffer is current, it is marked \"done\" and optionally saved. | |
ed9ae328 | 670 | The buffer is also killed if it did not exist before the clients asked for it. |
9ae0f972 | 671 | When all of a client's buffers are marked as \"done\", the client is notified. |
672 | ||
673 | Temporary files such as MH <draft> files are always saved and backed up, | |
991298c3 RS |
674 | no questions asked. (The variable `make-backup-files', if nil, still |
675 | inhibits a backup; you can set it locally in a particular buffer to | |
676 | prevent a backup for it.) The variable `server-temp-file-regexp' controls | |
9ae0f972 | 677 | which filenames are considered temporary. |
678 | ||
64f51134 | 679 | If invoked with a prefix argument, or if there is no server process running, |
9ae0f972 | 680 | starts server process and that is all. Invoked by \\[server-edit]." |
9ae0f972 | 681 | (interactive "P") |
6b519504 | 682 | (cond |
95eefb35 JB |
683 | ((or arg |
684 | (not server-process) | |
685 | (memq (process-status server-process) '(signal exit))) | |
686 | (server-mode 1)) | |
687 | (server-clients (apply 'server-switch-buffer (server-done))) | |
688 | (t (message "No server editing buffers exist")))) | |
9ae0f972 | 689 | |
98a4349c | 690 | (defun server-switch-buffer (&optional next-buffer killed-one) |
9ae0f972 | 691 | "Switch to another buffer, preferably one that has a client. |
692 | Arg NEXT-BUFFER is a suggestion; if it is a live buffer, use it." | |
9184aafb RS |
693 | ;; KILLED-ONE is t in a recursive call |
694 | ;; if we have already killed one temp-file server buffer. | |
695 | ;; This means we should avoid the final "switch to some other buffer" | |
696 | ;; since we've already effectively done that. | |
ca0c7250 SM |
697 | (if (null next-buffer) |
698 | (if server-clients | |
699 | (server-switch-buffer (nth 1 (car server-clients)) killed-one) | |
0c851d78 | 700 | (unless (or killed-one (window-dedicated-p (selected-window))) |
90ee5627 RS |
701 | (switch-to-buffer (other-buffer)) |
702 | (message "No server buffers remain to edit"))) | |
ca0c7250 SM |
703 | (if (not (buffer-name next-buffer)) |
704 | ;; If NEXT-BUFFER is a dead buffer, remove the server records for it | |
9ae0f972 | 705 | ;; and try the next surviving server buffer. |
ca0c7250 SM |
706 | (apply 'server-switch-buffer (server-buffer-done next-buffer)) |
707 | ;; OK, we know next-buffer is live, let's display and select it. | |
408784a7 SM |
708 | (if (functionp server-window) |
709 | (funcall server-window next-buffer) | |
710 | (let ((win (get-buffer-window next-buffer 0))) | |
711 | (if (and win (not server-window)) | |
712 | ;; The buffer is already displayed: just reuse the window. | |
90caccca JB |
713 | (progn |
714 | (select-window win) | |
715 | (set-buffer next-buffer)) | |
408784a7 SM |
716 | ;; Otherwise, let's find an appropriate window. |
717 | (cond ((and (windowp server-window) | |
718 | (window-live-p server-window)) | |
719 | (select-window server-window)) | |
720 | ((framep server-window) | |
337e3c70 JB |
721 | (unless (frame-live-p server-window) |
722 | (setq server-window (make-frame))) | |
408784a7 | 723 | (select-window (frame-selected-window server-window)))) |
337e3c70 JB |
724 | (when (window-minibuffer-p (selected-window)) |
725 | (select-window (next-window nil 'nomini 0))) | |
408784a7 SM |
726 | ;; Move to a non-dedicated window, if we have one. |
727 | (when (window-dedicated-p (selected-window)) | |
728 | (select-window | |
729 | (get-window-with-predicate | |
730 | (lambda (w) | |
731 | (and (not (window-dedicated-p w)) | |
732 | (equal (frame-parameter (window-frame w) 'display) | |
733 | (frame-parameter (selected-frame) 'display)))) | |
734 | 'nomini 'visible (selected-window)))) | |
735 | (condition-case nil | |
736 | (switch-to-buffer next-buffer) | |
737 | ;; After all the above, we might still have ended up with | |
738 | ;; a minibuffer/dedicated-window (if there's no other). | |
90caccca JB |
739 | (error (pop-to-buffer next-buffer))))))) |
740 | (when server-raise-frame | |
741 | (select-frame-set-input-focus (window-frame (selected-window)))))) | |
9ae0f972 | 742 | |
772c5eb7 | 743 | (define-key ctl-x-map "#" 'server-edit) |
df4e8a11 DL |
744 | |
745 | (defun server-unload-hook () | |
2e8457a0 | 746 | (server-mode -1) |
df4e8a11 DL |
747 | (remove-hook 'kill-buffer-query-functions 'server-kill-buffer-query-function) |
748 | (remove-hook 'kill-emacs-query-functions 'server-kill-emacs-query-function) | |
749 | (remove-hook 'kill-buffer-hook 'server-kill-buffer)) | |
3bb38bc2 | 750 | |
2e8457a0 | 751 | (add-hook 'kill-emacs-hook (lambda () (server-mode -1))) ;Cleanup upon exit. |
3bb38bc2 | 752 | (add-hook 'server-unload-hook 'server-unload-hook) |
16c15321 RM |
753 | \f |
754 | (provide 'server) | |
c88ab9ce | 755 | |
2e8457a0 | 756 | ;; arch-tag: 1f7ecb42-f00a-49f8-906d-61995d84c8d6 |
c88ab9ce | 757 | ;;; server.el ends here |