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1 ;;; nntp.el --- nntp access for Gnus
2 ;; Copyright (C) 1987,88,89,90,92,93,94,95,96 Free Software Foundation, Inc.
4 ;; Author: Masanobu UMEDA <umerin@flab.flab.fujitsu.junet>
5 ;; Lars Magne Ingebrigtsen <larsi@ifi.uio.no>
6 ;; Keywords: news
8 ;; This file is part of GNU Emacs.
10 ;; GNU Emacs is free software; you can redistribute it and/or modify
11 ;; it under the terms of the GNU General Public License as published by
12 ;; the Free Software Foundation; either version 2, or (at your option)
13 ;; any later version.
15 ;; GNU Emacs is distributed in the hope that it will be useful,
16 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
17 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 ;; GNU General Public License for more details.
20 ;; You should have received a copy of the GNU General Public License
21 ;; along with GNU Emacs; see the file COPYING. If not, write to the
22 ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
23 ;; Boston, MA 02111-1307, USA.
25 ;;; Commentary:
27 ;;; Code:
29 (require 'nnheader)
30 (require 'nnoo)
31 (eval-when-compile (require 'cl))
33 (nnoo-declare nntp)
35 (eval-and-compile
36 (unless (fboundp 'open-network-stream)
37 (require 'tcp)))
39 (eval-when-compile (require 'cl))
41 (eval-and-compile
42 (autoload 'cancel-timer "timer")
43 (autoload 'telnet "telnet" nil t)
44 (autoload 'telnet-send-input "telnet" nil t)
45 (autoload 'timezone-parse-date "timezone"))
47 (defvoo nntp-server-hook nil
48 "*Hooks for the NNTP server.
49 If the kanji code of the NNTP server is different from the local kanji
50 code, the correct kanji code of the buffer associated with the NNTP
51 server must be specified as follows:
53 \(setq nntp-server-hook
54 (function
55 (lambda ()
56 ;; Server's Kanji code is EUC (NEmacs hack).
57 (make-local-variable 'kanji-fileio-code)
58 (setq kanji-fileio-code 0))))
60 If you'd like to change something depending on the server in this
61 hook, use the variable `nntp-address'.")
63 (defvoo nntp-server-opened-hook '(nntp-send-mode-reader)
64 "*Hook used for sending commands to the server at startup.
65 The default value is `nntp-send-mode-reader', which makes an innd
66 server spawn an nnrpd server. Another useful function to put in this
67 hook might be `nntp-send-authinfo', which will prompt for a password
68 to allow posting from the server. Note that this is only necessary to
69 do on servers that use strict access control.")
70 (add-hook 'nntp-server-opened-hook 'nntp-send-mode-reader)
72 (defvoo nntp-server-action-alist
73 '(("nntpd 1\\.5\\.11t"
74 (remove-hook 'nntp-server-opened-hook 'nntp-send-mode-reader)))
75 "Alist of regexps to match on server types and actions to be taken.
76 For instance, if you want Gnus to beep every time you connect
77 to innd, you could say something like:
79 \(setq nntp-server-action-alist
80 '((\"innd\" (ding))))
82 You probably don't want to do that, though.")
84 (defvoo nntp-open-server-function 'nntp-open-network-stream
85 "*Function used for connecting to a remote system.
86 It will be called with the address of the remote system.
88 Two pre-made functions are `nntp-open-network-stream', which is the
89 default, and simply connects to some port or other on the remote
90 system (see nntp-port-number). The other is `nntp-open-rlogin', which
91 does an rlogin on the remote system, and then does a telnet to the
92 NNTP server available there (see nntp-rlogin-parameters).")
94 (defvoo nntp-rlogin-parameters '("telnet" "${NNTPSERVER:=localhost}" "nntp")
95 "*Parameters to `nntp-open-login'.
96 That function may be used as `nntp-open-server-function'. In that
97 case, this list will be used as the parameter list given to rsh.")
99 (defvoo nntp-rlogin-user-name nil
100 "*User name on remote system when using the rlogin connect method.")
102 (defvoo nntp-address nil
103 "*The name of the NNTP server.")
105 (defvoo nntp-port-number "nntp"
106 "*Port number to connect to.")
108 (defvoo nntp-end-of-line "\r\n"
109 "String to use on the end of lines when talking to the NNTP server.
110 This is \"\\r\\n\" by default, but should be \"\\n\" when
111 using rlogin to communicate with the server.")
113 (defvoo nntp-large-newsgroup 50
114 "*The number of the articles which indicates a large newsgroup.
115 If the number of the articles is greater than the value, verbose
116 messages will be shown to indicate the current status.")
118 (defvoo nntp-buggy-select (memq system-type '(fujitsu-uts))
119 "*t if your select routine is buggy.
120 If the select routine signals error or fall into infinite loop while
121 waiting for the server response, the variable must be set to t. In
122 case of Fujitsu UTS, it is set to T since `accept-process-output'
123 doesn't work properly.")
125 (defvoo nntp-maximum-request 400
126 "*The maximum number of the requests sent to the NNTP server at one time.
127 If Emacs hangs up while retrieving headers, set the variable to a
128 lower value.")
130 (defvoo nntp-debug-read 10000
131 "*Display '...' every 10Kbytes of a message being received if it is non-nil.
132 If it is a number, dots are displayed per the number.")
134 (defvoo nntp-nov-is-evil nil
135 "*If non-nil, nntp will never attempt to use XOVER when talking to the server.")
137 (defvoo nntp-xover-commands '("XOVER" "XOVERVIEW")
138 "*List of strings that are used as commands to fetch NOV lines from a server.
139 The strings are tried in turn until a positive response is gotten. If
140 none of the commands are successful, nntp will just grab headers one
141 by one.")
143 (defvoo nntp-nov-gap 20
144 "*Maximum allowed gap between two articles.
145 If the gap between two consecutive articles is bigger than this
146 variable, split the XOVER request into two requests.")
148 (defvoo nntp-connection-timeout nil
149 "*Number of seconds to wait before an nntp connection times out.
150 If this variable is nil, which is the default, no timers are set.")
152 (defvoo nntp-command-timeout nil
153 "*Number of seconds to wait for a response when sending a command.
154 If this variable is nil, which is the default, no timers are set.")
156 (defvoo nntp-retry-on-break nil
157 "*If non-nil, re-send the command when the user types `C-g'.")
159 (defvoo nntp-news-default-headers nil
160 "*If non-nil, override `mail-default-headers' when posting news.")
162 (defvoo nntp-prepare-server-hook nil
163 "*Hook run before a server is opened.
164 If can be used to set up a server remotely, for instance. Say you
165 have an account at the machine \"other.machine\". This machine has
166 access to an NNTP server that you can't access locally. You could
167 then use this hook to rsh to the remote machine and start a proxy NNTP
168 server there that you can connect to.")
170 (defvoo nntp-async-number 5
171 "*How many articles should be prefetched when in asynchronous mode.")
173 (defvoo nntp-warn-about-losing-connection t
174 "*If non-nil, beep when a server closes connection.")
178 (defconst nntp-version "nntp 4.0"
179 "Version numbers of this version of NNTP.")
181 (defvar nntp-server-buffer nil
182 "Buffer associated with the NNTP server process.")
184 (defvoo nntp-server-process nil
185 "The NNTP server process.
186 You'd better not use this variable in NNTP front-end program, but
187 instead use `nntp-server-buffer'.")
189 (defvoo nntp-status-string nil
190 "Save the server response message.")
192 (defvar nntp-opened-connections nil
193 "All (possibly) opened connections.")
195 (defvoo nntp-server-xover 'try)
196 (defvoo nntp-server-list-active-group 'try)
197 (defvoo nntp-current-group "")
198 (defvoo nntp-server-type nil)
200 (defvoo nntp-async-process nil)
201 (defvoo nntp-async-buffer nil)
202 (defvoo nntp-async-articles nil)
203 (defvoo nntp-async-fetched nil)
204 (defvoo nntp-async-group-alist nil)
207 ;;; Interface functions.
209 (nnoo-define-basics nntp)
211 (deffoo nntp-retrieve-headers (articles &optional group server fetch-old)
212 "Retrieve the headers of ARTICLES."
213 (nntp-possibly-change-server group server)
214 (save-excursion
215 (set-buffer nntp-server-buffer)
216 (erase-buffer)
217 (if (and (not gnus-nov-is-evil)
218 (not nntp-nov-is-evil)
219 (nntp-retrieve-headers-with-xover articles fetch-old))
220 ;; We successfully retrieved the headers via XOVER.
221 'nov
222 ;; XOVER didn't work, so we do it the hard, slow and inefficient
223 ;; way.
224 (let ((number (length articles))
225 (count 0)
226 (received 0)
227 (message-log-max nil)
228 (last-point (point-min)))
229 ;; Send HEAD command.
230 (while articles
231 (nntp-send-strings-to-server
232 "HEAD" (if (numberp (car articles))
233 (int-to-string (car articles))
234 ;; `articles' is either a list of article numbers
235 ;; or a list of article IDs.
236 (car articles)))
237 (setq articles (cdr articles)
238 count (1+ count))
239 ;; Every 400 header requests we have to read the stream in
240 ;; order to avoid deadlocks.
241 (when (or (null articles) ;All requests have been sent.
242 (zerop (% count nntp-maximum-request)))
243 (nntp-accept-response)
244 (while (progn
245 (goto-char last-point)
246 ;; Count replies.
247 (while (re-search-forward "^[0-9]" nil t)
248 (setq received (1+ received)))
249 (setq last-point (point))
250 (< received count))
251 ;; If number of headers is greater than 100, give
252 ;; informative messages.
253 (and (numberp nntp-large-newsgroup)
254 (> number nntp-large-newsgroup)
255 (zerop (% received 20))
256 (nnheader-message 7 "NNTP: Receiving headers... %d%%"
257 (/ (* received 100) number)))
258 (nntp-accept-response))))
259 ;; Wait for text of last command.
260 (goto-char (point-max))
261 (re-search-backward "^[0-9]" nil t)
262 (when (looking-at "^[23]")
263 (while (progn
264 (goto-char (- (point-max) 3))
265 (not (looking-at "^\\.\r?\n")))
266 (nntp-accept-response)))
267 (and (numberp nntp-large-newsgroup)
268 (> number nntp-large-newsgroup)
269 (nnheader-message 7 "NNTP: Receiving headers...done"))
271 ;; Now all of replies are received. Fold continuation lines.
272 (nnheader-fold-continuation-lines)
273 ;; Remove all "\r"'s.
274 (goto-char (point-min))
275 (while (search-forward "\r" nil t)
276 (replace-match "" t t))
277 'headers))))
280 (deffoo nntp-retrieve-groups (groups &optional server)
281 "Retrieve group info on GROUPS."
282 (nntp-possibly-change-server nil server)
283 (save-excursion
284 (set-buffer nntp-server-buffer)
285 ;; The first time this is run, this variable is `try'. So we
286 ;; try.
287 (when (eq nntp-server-list-active-group 'try)
288 (nntp-try-list-active (car groups)))
289 (erase-buffer)
290 (let ((count 0)
291 (received 0)
292 (last-point (point-min))
293 (command (if nntp-server-list-active-group "LIST ACTIVE" "GROUP")))
294 (while groups
295 ;; Send the command to the server.
296 (nntp-send-strings-to-server command (car groups))
297 (setq groups (cdr groups))
298 (setq count (1+ count))
299 ;; Every 400 requests we have to read the stream in
300 ;; order to avoid deadlocks.
301 (when (or (null groups) ;All requests have been sent.
302 (zerop (% count nntp-maximum-request)))
303 (nntp-accept-response)
304 (while (progn
305 (goto-char last-point)
306 ;; Count replies.
307 (while (re-search-forward "^[0-9]" nil t)
308 (setq received (1+ received)))
309 (setq last-point (point))
310 (< received count))
311 (nntp-accept-response))))
313 ;; Wait for the reply from the final command.
314 (when nntp-server-list-active-group
315 (goto-char (point-max))
316 (re-search-backward "^[0-9]" nil t)
317 (when (looking-at "^[23]")
318 (while (progn
319 (goto-char (- (point-max) 3))
320 (not (looking-at "^\\.\r?\n")))
321 (nntp-accept-response))))
323 ;; Now all replies are received. We remove CRs.
324 (goto-char (point-min))
325 (while (search-forward "\r" nil t)
326 (replace-match "" t t))
328 (if (not nntp-server-list-active-group)
329 'group
330 ;; We have read active entries, so we just delete the
331 ;; superfluos gunk.
332 (goto-char (point-min))
333 (while (re-search-forward "^[.2-5]" nil t)
334 (delete-region (match-beginning 0)
335 (progn (forward-line 1) (point))))
336 'active))))
338 (deffoo nntp-open-server (server &optional defs connectionless)
339 "Open the virtual server SERVER.
340 If CONNECTIONLESS is non-nil, don't attempt to connect to any physical
341 servers."
342 ;; Called with just a port number as the defs.
343 (when (or (stringp (car defs))
344 (numberp (car defs)))
345 (setq defs `((nntp-port-number ,(car defs)))))
346 (unless (assq 'nntp-address defs)
347 (setq defs (append defs `((nntp-address ,server)))))
348 (nnoo-change-server 'nntp server defs)
349 (if (nntp-server-opened server)
351 (or (nntp-server-opened server)
352 connectionless
353 (prog2
354 (run-hooks 'nntp-prepare-server-hook)
355 (nntp-open-server-semi-internal nntp-address nntp-port-number)
356 (nnheader-insert "")))))
358 (deffoo nntp-close-server (&optional server)
359 "Close connection to SERVER."
360 (nntp-possibly-change-server nil server t)
361 (unwind-protect
362 (progn
363 ;; Un-set default sentinel function before closing connection.
364 (and nntp-server-process
365 (eq 'nntp-default-sentinel
366 (process-sentinel nntp-server-process))
367 (set-process-sentinel nntp-server-process nil))
368 ;; We cannot send QUIT command unless the process is running.
369 (when (nntp-server-opened server)
370 (nntp-send-command nil "QUIT")
371 ;; Give the QUIT time to arrive.
372 (sleep-for 1)))
373 (nntp-close-server-internal server)))
375 (deffoo nntp-request-close ()
376 "Close all server connections."
377 (let (proc)
378 (while nntp-opened-connections
379 (when (setq proc (pop nntp-opened-connections))
380 ;; Un-set default sentinel function before closing connection.
381 (when (eq 'nntp-default-sentinel (process-sentinel proc))
382 (set-process-sentinel proc nil))
383 (condition-case ()
384 (process-send-string proc (concat "QUIT" nntp-end-of-line))
385 (error nil))
386 ;; Give the QUIT time to reach the server before we close
387 ;; down the process.
388 (sleep-for 1)
389 (delete-process proc)))
390 (and nntp-async-buffer
391 (buffer-name nntp-async-buffer)
392 (kill-buffer nntp-async-buffer))
393 (let ((alist (cddr (assq 'nntp nnoo-state-alist)))
394 entry)
395 (while (setq entry (pop alist))
396 (and (setq proc (cdr (assq 'nntp-async-buffer entry)))
397 (buffer-name proc)
398 (kill-buffer proc))))
399 (nnoo-close-server 'nntp)
400 (setq nntp-async-group-alist nil
401 nntp-async-articles nil)))
403 (deffoo nntp-server-opened (&optional server)
404 "Say whether a connection to SERVER has been opened."
405 (and (nnoo-current-server-p 'nntp server)
406 nntp-server-buffer
407 (buffer-name nntp-server-buffer)
408 nntp-server-process
409 (memq (process-status nntp-server-process) '(open run))))
411 (deffoo nntp-status-message (&optional server)
412 "Return server status as a string."
413 (if (and nntp-status-string
414 ;; NNN MESSAGE
415 (string-match "[0-9][0-9][0-9][ \t]+\\([^\r]*\\).*$"
416 nntp-status-string))
417 (substring nntp-status-string (match-beginning 1) (match-end 1))
418 ;; Empty message if nothing.
419 (or nntp-status-string "")))
421 (deffoo nntp-request-article (id &optional group server buffer)
422 "Request article ID (Message-ID or number)."
423 (nntp-possibly-change-server group server)
425 (let (found)
427 ;; First we see whether we can get the article from the async buffer.
428 (when (and (numberp id)
429 nntp-async-articles
430 (memq id nntp-async-fetched))
431 (save-excursion
432 (set-buffer nntp-async-buffer)
433 (let ((opoint (point))
434 (art (if (numberp id) (int-to-string id) id))
435 beg end)
436 (when (and (or (re-search-forward (concat "^2.. +" art) nil t)
437 (progn
438 (goto-char (point-min))
439 (re-search-forward (concat "^2.. +" art) opoint t)))
440 (progn
441 (beginning-of-line)
442 (setq beg (point)
443 end (re-search-forward "^\\.\r?\n" nil t))))
444 (setq found t)
445 (save-excursion
446 (set-buffer (or buffer nntp-server-buffer))
447 (erase-buffer)
448 (insert-buffer-substring nntp-async-buffer beg end)
449 (let ((nntp-server-buffer (current-buffer)))
450 (nntp-decode-text)))
451 (delete-region beg end)
452 (when nntp-async-articles
453 (nntp-async-fetch-articles id))))))
455 (if found
457 ;; The article was not in the async buffer, so we fetch it now.
458 (unwind-protect
459 (progn
460 (if buffer (set-process-buffer nntp-server-process buffer))
461 (let ((nntp-server-buffer (or buffer nntp-server-buffer))
462 (art (or (and (numberp id) (int-to-string id)) id)))
463 (prog1
464 (and (nntp-send-command
465 ;; A bit odd regexp to ensure working over rlogin.
466 "^\\.\r?\n" "ARTICLE" art)
467 (if (numberp id)
468 (cons nntp-current-group id)
469 ;; We find out what the article number was.
470 (nntp-find-group-and-number)))
471 (nntp-decode-text)
472 (and nntp-async-articles (nntp-async-fetch-articles id)))))
473 (when buffer
474 (set-process-buffer nntp-server-process nntp-server-buffer))))))
476 (deffoo nntp-request-body (id &optional group server)
477 "Request body of article ID (Message-ID or number)."
478 (nntp-possibly-change-server group server)
479 (prog1
480 ;; If NEmacs, end of message may look like: "\256\215" (".^M")
481 (nntp-send-command
482 "^\\.\r?\n" "BODY" (or (and (numberp id) (int-to-string id)) id))
483 (nntp-decode-text)))
485 (deffoo nntp-request-head (id &optional group server)
486 "Request head of article ID (Message-ID or number)."
487 (nntp-possibly-change-server group server)
488 (prog1
489 (when (nntp-send-command
490 "^\\.\r?\n" "HEAD" (if (numberp id) (int-to-string id) id))
491 (if (numberp id) id
492 ;; We find out what the article number was.
493 (nntp-find-group-and-number)))
494 (nntp-decode-text)
495 (save-excursion
496 (set-buffer nntp-server-buffer)
497 (nnheader-fold-continuation-lines))))
499 (deffoo nntp-request-stat (id &optional group server)
500 "Request STAT of article ID (Message-ID or number)."
501 (nntp-possibly-change-server group server)
502 (nntp-send-command
503 "^[23].*\r?\n" "STAT" (or (and (numberp id) (int-to-string id)) id)))
505 (deffoo nntp-request-type (group &optional article)
506 'news)
508 (deffoo nntp-request-group (group &optional server dont-check)
509 "Select GROUP."
510 (nntp-possibly-change-server nil server)
511 (setq nntp-current-group
512 (when (nntp-send-command "^2.*\r?\n" "GROUP" group)
513 group)))
515 (deffoo nntp-request-asynchronous (group &optional server articles)
516 "Enable pre-fetch in GROUP."
517 (when nntp-async-articles
518 (nntp-async-request-group group))
519 (when nntp-async-number
520 (if (not (or (nntp-async-server-opened)
521 (nntp-async-open-server)))
522 ;; Couldn't open the second connection
523 (progn
524 (message "Can't open second connection to %s" nntp-address)
525 (ding)
526 (setq nntp-async-articles nil)
527 (sit-for 2))
528 ;; We opened the second connection (or it was opened already).
529 (setq nntp-async-articles articles)
530 (setq nntp-async-fetched nil)
531 ;; Clear any old data.
532 (save-excursion
533 (set-buffer nntp-async-buffer)
534 (erase-buffer))
535 ;; Select the correct current group on this server.
536 (nntp-async-send-strings "GROUP" group)
537 t)))
539 (deffoo nntp-list-active-group (group &optional server)
540 "Return the active info on GROUP (which can be a regexp."
541 (nntp-possibly-change-server group server)
542 (nntp-send-command "^.*\r?\n" "LIST ACTIVE" group))
544 (deffoo nntp-request-group-description (group &optional server)
545 "Get the description of GROUP."
546 (nntp-possibly-change-server nil server)
547 (prog1
548 (nntp-send-command "^.*\r?\n" "XGTITLE" group)
549 (nntp-decode-text)))
551 (deffoo nntp-close-group (group &optional server)
552 "Close GROUP."
553 (setq nntp-current-group nil)
556 (deffoo nntp-request-list (&optional server)
557 "List all active groups."
558 (nntp-possibly-change-server nil server)
559 (prog1
560 (nntp-send-command "^\\.\r?\n" "LIST")
561 (nntp-decode-text)))
563 (deffoo nntp-request-list-newsgroups (&optional server)
564 "Get descriptions on all groups on SERVER."
565 (nntp-possibly-change-server nil server)
566 (prog1
567 (nntp-send-command "^\\.\r?\n" "LIST NEWSGROUPS")
568 (nntp-decode-text)))
570 (deffoo nntp-request-newgroups (date &optional server)
571 "List groups that have arrived since DATE."
572 (nntp-possibly-change-server nil server)
573 (let* ((date (timezone-parse-date date))
574 (time-string
575 (format "%s%02d%02d %s%s%s"
576 (substring (aref date 0) 2) (string-to-int (aref date 1))
577 (string-to-int (aref date 2)) (substring (aref date 3) 0 2)
578 (substring
579 (aref date 3) 3 5) (substring (aref date 3) 6 8))))
580 (prog1
581 (nntp-send-command "^\\.\r?\n" "NEWGROUPS" time-string)
582 (nntp-decode-text))))
584 (deffoo nntp-request-list-distributions (&optional server)
585 "List distributions."
586 (nntp-possibly-change-server nil server)
587 (prog1
588 (nntp-send-command "^\\.\r?\n" "LIST DISTRIBUTIONS")
589 (nntp-decode-text)))
591 (deffoo nntp-request-last (&optional group server)
592 "Decrease the current article pointer."
593 (nntp-possibly-change-server group server)
594 (nntp-send-command "^[23].*\r?\n" "LAST"))
596 (deffoo nntp-request-next (&optional group server)
597 "Advance the current article pointer."
598 (nntp-possibly-change-server group server)
599 (nntp-send-command "^[23].*\r?\n" "NEXT"))
601 (deffoo nntp-request-post (&optional server)
602 "Post the current buffer."
603 (nntp-possibly-change-server nil server)
604 (when (nntp-send-command "^[23].*\r?\n" "POST")
605 (nnheader-insert "")
606 (nntp-encode-text)
607 (nntp-send-region-to-server (point-min) (point-max))
608 ;; 1.2a NNTP's post command is buggy. "^M" (\r) is not
609 ;; appended to end of the status message.
610 (nntp-wait-for-response "^[23].*\n")))
612 ;;; Internal functions.
614 (defun nntp-send-mode-reader ()
615 "Send the MODE READER command to the nntp server.
616 This function is supposed to be called from `nntp-server-opened-hook'.
617 It will make innd servers spawn an nnrpd process to allow actual article
618 reading."
619 (nntp-send-command "^.*\r?\n" "MODE READER"))
621 (defun nntp-send-nosy-authinfo ()
622 "Send the AUTHINFO to the nntp server.
623 This function is supposed to be called from `nntp-server-opened-hook'.
624 It will prompt for a password."
625 (nntp-send-command "^.*\r?\n" "AUTHINFO USER"
626 (read-string "NNTP user name: "))
627 (nntp-send-command "^.*\r?\n" "AUTHINFO PASS"
628 (read-string "NNTP password: ")))
630 (defun nntp-send-authinfo ()
631 "Send the AUTHINFO to the nntp server.
632 This function is supposed to be called from `nntp-server-opened-hook'.
633 It will prompt for a password."
634 (nntp-send-command "^.*\r?\n" "AUTHINFO USER" (user-login-name))
635 (nntp-send-command "^.*\r?\n" "AUTHINFO PASS"
636 (read-string "NNTP password: ")))
638 (defun nntp-send-authinfo-from-file ()
639 "Send the AUTHINFO to the nntp server.
640 This function is supposed to be called from `nntp-server-opened-hook'.
641 It will prompt for a password."
642 (when (file-exists-p "~/.nntp-authinfo")
643 (save-excursion
644 (set-buffer (get-buffer-create " *authinfo*"))
645 (buffer-disable-undo (current-buffer))
646 (erase-buffer)
647 (insert-file-contents "~/.nntp-authinfo")
648 (goto-char (point-min))
649 (nntp-send-command "^.*\r?\n" "AUTHINFO USER" (user-login-name))
650 (nntp-send-command
651 "^.*\r?\n" "AUTHINFO PASS"
652 (buffer-substring (point) (progn (end-of-line) (point))))
653 (kill-buffer (current-buffer)))))
655 (defun nntp-default-sentinel (proc status)
656 "Default sentinel function for NNTP server process."
657 (let ((servers (cddr (assq 'nntp nnoo-state-alist)))
658 server)
659 ;; Go through the alist of server names and find the name of the
660 ;; server that the process that sent the signal is connected to.
661 ;; If you get my drift.
662 (if (equal proc nntp-server-process)
663 (setq server nntp-address)
664 (while (and servers
665 (not (equal proc (cdr (assq 'nntp-server-process
666 (car servers))))))
667 (setq servers (cdr servers)))
668 (setq server (caar servers)))
669 (when (and server
670 nntp-warn-about-losing-connection)
671 (nnheader-message 3 "nntp: Connection closed to server %s" server)
672 (setq nntp-current-group "")
673 (ding))))
675 (defun nntp-kill-connection (server)
676 "Choke the connection to SERVER."
677 (let ((proc (cdr (assq 'nntp-server-process
678 (assoc server (cddr
679 (assq 'nntp nnoo-state-alist)))))))
680 (when proc
681 (delete-process (process-name proc)))
682 (nntp-close-server server)
683 (nnheader-report
684 'nntp (message "Connection timed out to server %s" server))
685 (ding)
686 (sit-for 1)))
688 ;; Encoding and decoding of NNTP text.
690 (defun nntp-decode-text ()
691 "Decode text transmitted by NNTP.
692 0. Delete status line.
693 1. Delete `^M' at end of line.
694 2. Delete `.' at end of buffer (end of text mark).
695 3. Delete `.' at beginning of line."
696 (save-excursion
697 (set-buffer nntp-server-buffer)
698 ;; Insert newline at end of buffer.
699 (goto-char (point-max))
700 (or (bolp) (insert "\n"))
701 ;; Delete status line.
702 (delete-region (goto-char (point-min)) (progn (forward-line 1) (point)))
703 ;; Delete `^M's.
704 (while (search-forward "\r" nil t)
705 (replace-match "" t t))
706 ;; Delete `.' at end of the buffer (end of text mark).
707 (goto-char (point-max))
708 (forward-line -1)
709 (when (looking-at "^\\.\n")
710 (delete-region (point) (progn (forward-line 1) (point))))
711 ;; Replace `..' at beginning of line with `.'.
712 (goto-char (point-min))
713 ;; (replace-regexp "^\\.\\." ".")
714 (while (search-forward "\n.." nil t)
715 (delete-char -1))))
717 (defun nntp-encode-text ()
718 "Encode text in current buffer for NNTP transmission.
719 1. Insert `.' at beginning of line.
720 2. Insert `.' at end of buffer (end of text mark)."
721 (save-excursion
722 ;; Replace `.' at beginning of line with `..'.
723 (goto-char (point-min))
724 (while (search-forward "\n." nil t)
725 (insert "."))
726 (goto-char (point-max))
727 ;; Insert newline at end of buffer.
728 (or (bolp) (insert "\n"))
729 ;; Insert `.' at end of buffer (end of text mark).
730 (insert "." nntp-end-of-line)))
734 ;;; Synchronous Communication with NNTP servers.
737 (defvar nntp-retry-command)
739 (defun nntp-send-command (response cmd &rest args)
740 "Wait for server RESPONSE after sending CMD and optional ARGS to server."
741 (let ((timer
742 (and nntp-command-timeout
743 (nnheader-run-at-time
744 nntp-command-timeout nil 'nntp-kill-command
745 (nnoo-current-server 'nntp))))
746 (nntp-retry-command t)
747 result)
748 (unwind-protect
749 (save-excursion
750 (while nntp-retry-command
751 (setq nntp-retry-command nil)
752 ;; Clear communication buffer.
753 (set-buffer nntp-server-buffer)
754 (widen)
755 (erase-buffer)
756 (if nntp-retry-on-break
757 (condition-case ()
758 (progn
759 (apply 'nntp-send-strings-to-server cmd args)
760 (setq result
761 (if response
762 (nntp-wait-for-response response)
763 t)))
764 (quit (setq nntp-retry-command t)))
765 (apply 'nntp-send-strings-to-server cmd args)
766 (setq result
767 (if response
768 (nntp-wait-for-response response)
769 t))))
770 result)
771 (when timer
772 (nnheader-cancel-timer timer)))))
774 (defun nntp-kill-command (server)
775 "Kill and restart the connection to SERVER."
776 (let ((proc (cdr (assq
777 'nntp-server-process
778 (assoc server (cddr (assq 'nntp nnoo-state-alist)))))))
779 (when proc
780 (delete-process (process-name proc)))
781 (nntp-close-server server)
782 (nntp-open-server server)
783 (when nntp-current-group
784 (nntp-request-group nntp-current-group))
785 (setq nntp-retry-command t)))
787 (defun nntp-send-command-old (response cmd &rest args)
788 "Wait for server RESPONSE after sending CMD and optional ARGS to server."
789 (save-excursion
790 ;; Clear communication buffer.
791 (set-buffer nntp-server-buffer)
792 (erase-buffer)
793 (apply 'nntp-send-strings-to-server cmd args)
794 (if response
795 (nntp-wait-for-response response)
796 t)))
798 (defun nntp-wait-for-response (regexp &optional slow)
799 "Wait for server response which matches REGEXP."
800 (save-excursion
801 (let ((status t)
802 (wait t)
803 (dotnum 0) ;Number of "." being displayed.
804 (dotsize ;How often "." displayed.
805 (if (numberp nntp-debug-read) nntp-debug-read 10000)))
806 (set-buffer nntp-server-buffer)
807 ;; Wait for status response (RFC977).
808 ;; 1xx - Informative message.
809 ;; 2xx - Command ok.
810 ;; 3xx - Command ok so far, send the rest of it.
811 ;; 4xx - Command was correct, but couldn't be performed for some
812 ;; reason.
813 ;; 5xx - Command unimplemented, or incorrect, or a serious
814 ;; program error occurred.
815 (nntp-accept-response)
816 (while wait
817 (goto-char (point-min))
818 (if slow
819 (progn
820 (cond ((re-search-forward "^[23][0-9][0-9]" nil t)
821 (setq wait nil))
822 ((re-search-forward "^[45][0-9][0-9]" nil t)
823 (setq status nil)
824 (setq wait nil))
825 (t (nntp-accept-response)))
826 (if (not wait) (delete-region (point-min)
827 (progn (beginning-of-line)
828 (point)))))
829 (cond ((looking-at "[23]")
830 (setq wait nil))
831 ((looking-at "[45]")
832 (setq status nil)
833 (setq wait nil))
834 (t (nntp-accept-response)))))
835 ;; Save status message.
836 (end-of-line)
837 (setq nntp-status-string
838 (nnheader-replace-chars-in-string
839 (buffer-substring (point-min) (point)) ?\r ? ))
840 (when status
841 (setq wait t)
842 (while wait
843 (goto-char (point-max))
844 (if (bolp) (forward-line -1) (beginning-of-line))
845 (if (looking-at regexp)
846 (setq wait nil)
847 (when nntp-debug-read
848 (let ((newnum (/ (buffer-size) dotsize))
849 (message-log-max nil))
850 (unless (= dotnum newnum)
851 (setq dotnum newnum)
852 (nnheader-message 7 "NNTP: Reading %s"
853 (make-string dotnum ?.)))))
854 (nntp-accept-response)))
855 ;; Remove "...".
856 (when (and nntp-debug-read (> dotnum 0))
857 (message ""))
858 ;; Successfully received server response.
859 t))))
864 ;;; Low-Level Interface to NNTP Server.
865 ;;;
867 (defun nntp-find-group-and-number ()
868 (save-excursion
869 (save-restriction
870 (set-buffer nntp-server-buffer)
871 (narrow-to-region (goto-char (point-min))
872 (or (search-forward "\n\n" nil t) (point-max)))
873 (goto-char (point-min))
874 ;; We first find the number by looking at the status line.
875 (let ((number (and (looking-at "2[0-9][0-9] +\\([0-9]+\\) ")
876 (string-to-int
877 (buffer-substring (match-beginning 1)
878 (match-end 1)))))
879 group newsgroups xref)
880 (and number (zerop number) (setq number nil))
881 ;; Then we find the group name.
882 (setq group
883 (cond
884 ;; If there is only one group in the Newsgroups header,
885 ;; then it seems quite likely that this article comes
886 ;; from that group, I'd say.
887 ((and (setq newsgroups (mail-fetch-field "newsgroups"))
888 (not (string-match "," newsgroups)))
889 newsgroups)
890 ;; If there is more than one group in the Newsgroups
891 ;; header, then the Xref header should be filled out.
892 ;; We hazard a guess that the group that has this
893 ;; article number in the Xref header is the one we are
894 ;; looking for. This might very well be wrong if this
895 ;; article happens to have the same number in several
896 ;; groups, but that's life.
897 ((and (setq xref (mail-fetch-field "xref"))
898 number
899 (string-match (format "\\([^ :]+\\):%d" number) xref))
900 (substring xref (match-beginning 1) (match-end 1)))
901 (t "")))
902 (when (string-match "\r" group)
903 (setq group (substring group 0 (match-beginning 0))))
904 (cons group number)))))
906 (defun nntp-retrieve-headers-with-xover (articles &optional fetch-old)
907 (erase-buffer)
908 (cond
910 ;; This server does not talk NOV.
911 ((not nntp-server-xover)
912 nil)
914 ;; We don't care about gaps.
915 ((or (not nntp-nov-gap)
916 fetch-old)
917 (nntp-send-xover-command
918 (if fetch-old
919 (if (numberp fetch-old)
920 (max 1 (- (car articles) fetch-old))
922 (car articles))
923 (nntp-last-element articles) 'wait)
925 (goto-char (point-min))
926 (when (looking-at "[1-5][0-9][0-9] ")
927 (delete-region (point) (progn (forward-line 1) (point))))
928 (while (search-forward "\r" nil t)
929 (replace-match "" t t))
930 (goto-char (point-max))
931 (forward-line -1)
932 (when (looking-at "\\.")
933 (delete-region (point) (progn (forward-line 1) (point)))))
935 ;; We do it the hard way. For each gap, an XOVER command is sent
936 ;; to the server. We do not wait for a reply from the server, we
937 ;; just send them off as fast as we can. That means that we have
938 ;; to count the number of responses we get back to find out when we
939 ;; have gotten all we asked for.
940 ((numberp nntp-nov-gap)
941 (let ((count 0)
942 (received 0)
943 (last-point (point-min))
944 (buf (current-buffer))
945 first)
946 ;; We have to check `nntp-server-xover'. If it gets set to nil,
947 ;; that means that the server does not understand XOVER, but we
948 ;; won't know that until we try.
949 (while (and nntp-server-xover articles)
950 (setq first (car articles))
951 ;; Search forward until we find a gap, or until we run out of
952 ;; articles.
953 (while (and (cdr articles)
954 (< (- (nth 1 articles) (car articles)) nntp-nov-gap))
955 (setq articles (cdr articles)))
957 (when (nntp-send-xover-command first (car articles))
958 (setq articles (cdr articles)
959 count (1+ count))
961 ;; Every 400 requests we have to read the stream in
962 ;; order to avoid deadlocks.
963 (when (or (null articles) ;All requests have been sent.
964 (zerop (% count nntp-maximum-request)))
965 (accept-process-output)
966 ;; On some Emacs versions the preceding function has
967 ;; a tendency to change the buffer. Perhaps. It's
968 ;; quite difficult to reproduce, because it only
969 ;; seems to happen once in a blue moon.
970 (set-buffer buf)
971 (while (progn
972 (goto-char last-point)
973 ;; Count replies.
974 (while (re-search-forward "^[0-9][0-9][0-9] " nil t)
975 (setq received (1+ received)))
976 (setq last-point (point))
977 (< received count))
978 (accept-process-output)
979 (set-buffer buf)))))
981 (when nntp-server-xover
982 ;; Wait for the reply from the final command.
983 (goto-char (point-max))
984 (re-search-backward "^[0-9][0-9][0-9] " nil t)
985 (when (looking-at "^[23]")
986 (while (progn
987 (goto-char (point-max))
988 (forward-line -1)
989 (not (looking-at "^\\.\r?\n")))
990 (nntp-accept-response)))
992 ;; We remove any "." lines and status lines.
993 (goto-char (point-min))
994 (while (search-forward "\r" nil t)
995 (delete-char -1))
996 (goto-char (point-min))
997 (delete-matching-lines "^\\.$\\|^[1-5][0-9][0-9] ")))))
999 nntp-server-xover)
1001 (defun nntp-send-xover-command (beg end &optional wait-for-reply)
1002 "Send the XOVER command to the server."
1003 (let ((range (format "%d-%d" (or beg 1) (or end beg 1))))
1004 (if (stringp nntp-server-xover)
1005 ;; If `nntp-server-xover' is a string, then we just send this
1006 ;; command.
1007 (if wait-for-reply
1008 (nntp-send-command "^\\.\r?\n" nntp-server-xover range)
1009 ;; We do not wait for the reply.
1010 (nntp-send-strings-to-server nntp-server-xover range))
1011 (let ((commands nntp-xover-commands))
1012 ;; `nntp-xover-commands' is a list of possible XOVER commands.
1013 ;; We try them all until we get at positive response.
1014 (while (and commands (eq nntp-server-xover 'try))
1015 (nntp-send-command "^\\.\r?\n" (car commands) range)
1016 (save-excursion
1017 (set-buffer nntp-server-buffer)
1018 (goto-char (point-min))
1019 (and (looking-at "[23]") ; No error message.
1020 ;; We also have to look at the lines. Some buggy
1021 ;; servers give back simple lines with just the
1022 ;; article number. How... helpful.
1023 (progn
1024 (forward-line 1)
1025 (looking-at "[0-9]+\t...")) ; More text after number.
1026 (setq nntp-server-xover (car commands))))
1027 (setq commands (cdr commands)))
1028 ;; If none of the commands worked, we disable XOVER.
1029 (when (eq nntp-server-xover 'try)
1030 (save-excursion
1031 (set-buffer nntp-server-buffer)
1032 (erase-buffer)
1033 (setq nntp-server-xover nil)))
1034 nntp-server-xover))))
1036 (defun nntp-send-strings-to-server (&rest strings)
1037 "Send STRINGS to the server."
1038 (let ((cmd (concat (mapconcat 'identity strings " ") nntp-end-of-line)))
1039 ;; We open the nntp server if it is down.
1040 (or (nntp-server-opened (nnoo-current-server 'nntp))
1041 (nntp-open-server (nnoo-current-server 'nntp))
1042 (error (nntp-status-message)))
1043 ;; Send the strings.
1044 (process-send-string nntp-server-process cmd)
1047 (defun nntp-send-region-to-server (begin end)
1048 "Send the current buffer region (from BEGIN to END) to the server."
1049 (save-excursion
1050 (let ((cur (current-buffer)))
1051 ;; Copy the buffer over to the send buffer.
1052 (nnheader-set-temp-buffer " *nntp send*")
1053 (insert-buffer-substring cur begin end)
1054 (save-excursion
1055 (set-buffer cur)
1056 (erase-buffer))
1057 ;; `process-send-region' does not work if the text to be sent is very
1058 ;; large, so we send it piecemeal.
1059 (let ((last (point-min))
1060 (size 100)) ;Size of text sent at once.
1061 (while (and (/= last (point-max))
1062 (memq (process-status nntp-server-process) '(open run)))
1063 (process-send-region
1064 nntp-server-process
1065 last (setq last (min (+ last size) (point-max))))
1066 ;; Read any output from the server. May be unnecessary.
1067 (accept-process-output)))
1068 (kill-buffer (current-buffer)))))
1070 (defun nntp-open-server-semi-internal (server &optional service)
1071 "Open SERVER.
1072 If SERVER is nil, use value of environment variable `NNTPSERVER'.
1073 If SERVICE, this this as the port number."
1074 (nnheader-insert "")
1075 (let ((server (or server (getenv "NNTPSERVER")))
1076 (status nil)
1077 (timer
1078 (and nntp-connection-timeout
1079 (nnheader-run-at-time nntp-connection-timeout
1080 nil 'nntp-kill-connection server))))
1081 (save-excursion
1082 (set-buffer nntp-server-buffer)
1083 (setq nntp-status-string "")
1084 (nnheader-message 5 "nntp: Connecting to server on %s..." nntp-address)
1085 (cond ((and server (nntp-open-server-internal server service))
1086 (setq nntp-address server)
1087 (setq status
1088 (condition-case nil
1089 (nntp-wait-for-response "^[23].*\r?\n" 'slow)
1090 (error nil)
1091 (quit nil)))
1092 (unless status
1093 (nntp-close-server-internal server)
1094 (nnheader-report
1095 'nntp "Couldn't open connection to %s"
1096 (if (and nntp-address
1097 (not (equal nntp-address "")))
1098 nntp-address server)))
1099 (when nntp-server-process
1100 (set-process-sentinel
1101 nntp-server-process 'nntp-default-sentinel)
1102 ;; You can send commands at startup like AUTHINFO here.
1103 ;; Added by Hallvard B Furuseth <h.b.furuseth@usit.uio.no>
1104 (run-hooks 'nntp-server-opened-hook)))
1105 ((null server)
1106 (nnheader-report 'nntp "NNTP server is not specified."))
1107 (t ; We couldn't open the server.
1108 (nnheader-report
1109 'nntp (buffer-substring (point-min) (point-max)))))
1110 (when timer
1111 (nnheader-cancel-timer timer))
1112 (message "")
1113 (unless status
1114 (nnoo-close-server 'nntp server)
1115 (setq nntp-async-number nil))
1116 status)))
1118 (defvar nntp-default-directories '("~" "/tmp" "/")
1119 "Directories to as current directory in the nntp server buffer.")
1121 (defun nntp-open-server-internal (server &optional service)
1122 "Open connection to news server on SERVER by SERVICE (default is nntp)."
1123 (let (proc)
1124 (save-excursion
1125 (set-buffer nntp-server-buffer)
1126 ;; Make sure we have a valid current directory for the
1127 ;; nntp server buffer.
1128 (unless (file-exists-p default-directory)
1129 (let ((dirs nntp-default-directories))
1130 (while dirs
1131 (when (file-exists-p (car dirs))
1132 (setq default-directory (car dirs)
1133 dirs nil))
1134 (setq dirs (cdr dirs)))))
1135 (cond
1136 ((and (setq proc
1137 (condition-case nil
1138 (funcall nntp-open-server-function server)
1139 (error nil)))
1140 (memq (process-status proc) '(open run)))
1141 (setq nntp-server-process proc)
1142 (setq nntp-address server)
1143 ;; Suggested by Hallvard B Furuseth <h.b.furuseth@usit.uio.no>.
1144 (process-kill-without-query proc)
1145 (run-hooks 'nntp-server-hook)
1146 (push proc nntp-opened-connections)
1147 (condition-case ()
1148 (nntp-read-server-type)
1149 (error
1150 (nnheader-report 'nntp "Couldn't open server %s" server)
1151 (nntp-close-server)))
1152 nntp-server-process)
1154 (nnheader-report 'nntp "Couldn't open server %s" server))))))
1156 (defun nntp-read-server-type ()
1157 "Find out what the name of the server we have connected to is."
1158 ;; Wait for the status string to arrive.
1159 (nntp-wait-for-response "^.*\n" t)
1160 (setq nntp-server-type (buffer-string))
1161 (let ((alist nntp-server-action-alist)
1162 entry)
1163 ;; Run server-specific commmands.
1164 (while alist
1165 (setq entry (pop alist))
1166 (when (string-match (car entry) nntp-server-type)
1167 (if (and (listp (cadr entry))
1168 (not (eq 'lambda (caadr entry))))
1169 (eval (cadr entry))
1170 (funcall (cadr entry)))))))
1172 (defun nntp-open-network-stream (server)
1173 (open-network-stream
1174 "nntpd" nntp-server-buffer server nntp-port-number))
1176 (defun nntp-open-rlogin (server)
1177 (let ((proc (if nntp-rlogin-user-name
1178 (start-process
1179 "nntpd" nntp-server-buffer "rsh"
1180 "-l" nntp-rlogin-user-name server
1181 (mapconcat 'identity
1182 nntp-rlogin-parameters " "))
1183 (start-process
1184 "nntpd" nntp-server-buffer "rsh" server
1185 (mapconcat 'identity
1186 nntp-rlogin-parameters " ")))))
1187 proc))
1189 (defun nntp-telnet-to-machine ()
1190 (let (b)
1191 (telnet "localhost")
1192 (goto-char (point-min))
1193 (while (not (re-search-forward "^login: *" nil t))
1194 (sit-for 1)
1195 (goto-char (point-min)))
1196 (goto-char (point-max))
1197 (insert "larsi")
1198 (telnet-send-input)
1199 (setq b (point))
1200 (while (not (re-search-forward ">" nil t))
1201 (sit-for 1)
1202 (goto-char b))
1203 (goto-char (point-max))
1204 (insert "ls")
1205 (telnet-send-input)))
1207 (defun nntp-close-server-internal (&optional server)
1208 "Close connection to news server."
1209 (nntp-possibly-change-server nil server)
1210 (if nntp-server-process
1211 (delete-process nntp-server-process))
1212 (setq nntp-server-process nil)
1213 (setq nntp-address ""))
1215 (defun nntp-accept-response ()
1216 "Read response of server.
1217 It is well-known that the communication speed will be much improved by
1218 defining this function as macro."
1219 ;; To deal with server process exiting before
1220 ;; accept-process-output is called.
1221 ;; Suggested by Jason Venner <jason@violet.berkeley.edu>.
1222 ;; This is a copy of `nntp-default-sentinel'.
1223 (let ((buf (current-buffer)))
1224 (prog1
1225 (if (or (not nntp-server-process)
1226 (not (memq (process-status nntp-server-process) '(open run))))
1227 (error "nntp: Process connection closed; %s" (nntp-status-message))
1228 (if nntp-buggy-select
1229 (progn
1230 ;; We cannot use `accept-process-output'.
1231 ;; Fujitsu UTS requires messages during sleep-for.
1232 ;; I don't know why.
1233 (nnheader-message 5 "NNTP: Reading...")
1234 (sleep-for 1)
1235 (nnheader-message 5 ""))
1236 (condition-case errorcode
1237 (accept-process-output nntp-server-process 1)
1238 (error
1239 (cond ((string-equal "select error: Invalid argument"
1240 (nth 1 errorcode))
1241 ;; Ignore select error.
1242 nil)
1244 (signal (car errorcode) (cdr errorcode))))))))
1245 (set-buffer buf))))
1247 (defun nntp-last-element (list)
1248 "Return last element of LIST."
1249 (while (cdr list)
1250 (setq list (cdr list)))
1251 (car list))
1253 (defun nntp-possibly-change-server (newsgroup server &optional connectionless)
1254 "Check whether the virtual server needs changing."
1255 (when (and server
1256 (not (nntp-server-opened server)))
1257 ;; This virtual server isn't open, so we (re)open it here.
1258 (nntp-open-server server nil t))
1259 (when (and newsgroup
1260 (not (equal newsgroup nntp-current-group)))
1261 ;; Set the proper current group.
1262 (nntp-request-group newsgroup server)))
1264 (defun nntp-try-list-active (group)
1265 (nntp-list-active-group group)
1266 (save-excursion
1267 (set-buffer nntp-server-buffer)
1268 (goto-char (point-min))
1269 (cond ((looking-at "5[0-9]+")
1270 (setq nntp-server-list-active-group nil))
1272 (setq nntp-server-list-active-group t)))))
1274 (defun nntp-async-server-opened ()
1275 (and nntp-async-process
1276 (memq (process-status nntp-async-process) '(open run))))
1278 (defun nntp-async-open-server ()
1279 (save-excursion
1280 (set-buffer (generate-new-buffer " *async-nntp*"))
1281 (setq nntp-async-buffer (current-buffer))
1282 (buffer-disable-undo (current-buffer)))
1283 (let ((nntp-server-process nil)
1284 (nntp-server-buffer nntp-async-buffer))
1285 (nntp-open-server-semi-internal nntp-address nntp-port-number)
1286 (if (not (setq nntp-async-process nntp-server-process))
1287 (progn
1288 (setq nntp-async-number nil))
1289 (set-process-buffer nntp-async-process nntp-async-buffer))))
1291 (defun nntp-async-fetch-articles (article)
1292 (if (stringp article)
1294 (let ((articles (cdr (memq (assq article nntp-async-articles)
1295 nntp-async-articles)))
1296 (max (cond ((numberp nntp-async-number)
1297 nntp-async-number)
1298 ((eq nntp-async-number t)
1299 (length nntp-async-articles))
1300 (t 0)))
1301 nart)
1302 (while (and (>= (setq max (1- max)) 0)
1303 articles)
1304 (or (memq (setq nart (caar articles)) nntp-async-fetched)
1305 (progn
1306 (nntp-async-send-strings "ARTICLE " (int-to-string nart))
1307 (setq nntp-async-fetched (cons nart nntp-async-fetched))))
1308 (setq articles (cdr articles))))))
1310 (defun nntp-async-send-strings (&rest strings)
1311 (let ((cmd (concat (mapconcat 'identity strings " ") nntp-end-of-line)))
1312 (or (nntp-async-server-opened)
1313 (nntp-async-open-server)
1314 (error (nntp-status-message)))
1315 (process-send-string nntp-async-process cmd)))
1317 (defun nntp-async-request-group (group)
1318 (if (equal group nntp-current-group)
1320 (let ((asyncs (assoc group nntp-async-group-alist)))
1321 ;; A new group has been selected, so we push the current state
1322 ;; of async articles on an alist, and pull the old state off.
1323 (setq nntp-async-group-alist
1324 (cons (list nntp-current-group
1325 nntp-async-articles nntp-async-fetched
1326 nntp-async-process)
1327 (delq asyncs nntp-async-group-alist)))
1328 (and asyncs
1329 (progn
1330 (setq nntp-async-articles (nth 1 asyncs))
1331 (setq nntp-async-fetched (nth 2 asyncs))
1332 (setq nntp-async-process (nth 3 asyncs)))))))
1334 (provide 'nntp)
1336 ;;; nntp.el ends here