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[gnus] / lisp / nntp.el

;;; Copyright (C) 1987,88,89,90,92,93,94,95,96 Free Software Foundation, Inc.

;; Author: Lars Magne Ingebrigtsen <larsi@ifi.uio.no>
;; Keywords: news

;; This file is part of GNU Emacs.

;; GNU Emacs is free software; you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation; either version 2, or (at your option)
;; any later version.

;; GNU Emacs is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
;; GNU General Public License for more details.

;; You should have received a copy of the GNU General Public License
;; along with GNU Emacs; see the file COPYING.  If not, write to
;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.

;;; Commentary:

;;; Code:

(require 'nnheader)
(require 'nnoo)
(require 'gnus-util)

(nnoo-declare nntp)

(eval-and-compile
  (unless (fboundp 'open-network-stream)
    (require 'tcp)))

(eval-when-compile (require 'cl))

(defvoo nntp-address nil
  "Address of the physical nntp server.")

(defvoo nntp-port-number "nntp"
  "Port number on the physical nntp server.")

(defvoo nntp-server-opened-hook '(nntp-send-mode-reader)
  "*Hook used for sending commands to the server at startup.  
The default value is `nntp-send-mode-reader', which makes an innd
server spawn an nnrpd server.  Another useful function to put in this
hook might be `nntp-send-authinfo', which will prompt for a password
to allow posting from the server.  Note that this is only necessary to
do on servers that use strict access control.")

(defvoo nntp-authinfo-function 'nntp-send-authinfo
  "Function used to send AUTHINFO to the server.")

(defvoo nntp-server-action-alist 
  '(("nntpd 1\\.5\\.11t" 
     (remove-hook 'nntp-server-opened-hook 'nntp-send-mode-reader))
    ("NNRP server Netscape" 
     (setq nntp-server-list-active-group nil)))
  "Alist of regexps to match on server types and actions to be taken.
For instance, if you want Gnus to beep every time you connect
to innd, you could say something like:

\(setq nntp-server-action-alist
       '((\"innd\" (ding))))

You probably don't want to do that, though.")

(defvoo nntp-open-connection-function 'nntp-open-network-stream
  "*Function used for connecting to a remote system.
It will be called with the buffer to output in.

Two pre-made functions are `nntp-open-network-stream', which is the
default, and simply connects to some port or other on the remote
system (see nntp-port-number).  The other are `nntp-open-rlogin', which
does an rlogin on the remote system, and then does a telnet to the
NNTP server available there (see nntp-rlogin-parameters) and `nntp-open-telnet' which
telnets to a remote system, logs in and does the same")

(defvoo nntp-rlogin-parameters '("telnet" "-8" "${NNTPSERVER:=news}" "nntp")
  "*Parameters to `nntp-open-login'.
That function may be used as `nntp-open-server-function'.  In that
case, this list will be used as the parameter list given to rsh.")

(defvoo nntp-rlogin-user-name nil
  "*User name on remote system when using the rlogin connect method.")

(defvoo nntp-telnet-parameters '("exec" "telnet" "-8" "${NNTPSERVER:=news}" "nntp")
  "*Parameters to `nntp-open-telnet'.
That function may be used as `nntp-open-server-function'.  In that
case, this list will be executed as a command after logging in
via telnet.")

(defvoo nntp-telnet-user-name nil
  "User name to log in via telnet with.")

(defvoo nntp-telnet-passwd nil
  "Password to use to log in via telnet with.")

(defvoo nntp-end-of-line "\r\n"
  "String to use on the end of lines when talking to the NNTP server.
This is \"\\r\\n\" by default, but should be \"\\n\" when
using rlogin or telnet to communicate with the server.")

(defvoo nntp-large-newsgroup 50
  "*The number of the articles which indicates a large newsgroup.
If the number of the articles is greater than the value, verbose
messages will be shown to indicate the current status.")

(defvoo nntp-maximum-request 400
  "*The maximum number of the requests sent to the NNTP server at one time.
If Emacs hangs up while retrieving headers, set the variable to a
lower value.")

(defvoo nntp-nov-is-evil nil
  "*If non-nil, nntp will never attempt to use XOVER when talking to the server.")

(defvoo nntp-xover-commands '("XOVER" "XOVERVIEW")
  "*List of strings that are used as commands to fetch NOV lines from a server.
The strings are tried in turn until a positive response is gotten.  If
none of the commands are successful, nntp will just grab headers one
by one.")

(defvoo nntp-nov-gap 20
  "*Maximum allowed gap between two articles.
If the gap between two consecutive articles is bigger than this
variable, split the XOVER request into two requests.")

(defvoo nntp-connection-timeout nil
  "*Number of seconds to wait before an nntp connection times out.
If this variable is nil, which is the default, no timers are set.")

(defvoo nntp-prepare-server-hook nil
  "*Hook run before a server is opened.
If can be used to set up a server remotely, for instance.  Say you
have an account at the machine \"other.machine\".  This machine has
access to an NNTP server that you can't access locally.  You could
then use this hook to rsh to the remote machine and start a proxy NNTP
server there that you can connect to.  See also `nntp-open-connection-function'")

(defvoo nntp-warn-about-losing-connection t
  "*If non-nil, beep when a server closes connection.")

\f

;;; Internal variables.

(defvar nntp-process-wait-for nil)
(defvar nntp-process-to-buffer nil)
(defvar nntp-process-callback nil)
(defvar nntp-process-decode nil)
(defvar nntp-process-start-point nil)
(defvar nntp-inside-change-function nil)

(defvar nntp-connection-list nil)

(defvoo nntp-server-type nil)
(defvoo nntp-connection-alist nil)
(defvoo nntp-status-string "")
(defconst nntp-version "nntp 5.0")
(defvoo nntp-inhibit-erase nil)

(defvoo nntp-server-xover 'try)
(defvoo nntp-server-list-active-group 'try)

(eval-and-compile
  (autoload 'nnmail-read-passwd "nnmail"))

\f

;;; Interface functions.

(nnoo-define-basics nntp)

(deffoo nntp-retrieve-headers (articles &optional group server fetch-old)
  "Retrieve the headers of ARTICLES."
  (nntp-possibly-change-group group server)
  (save-excursion
    (set-buffer (nntp-find-connection-buffer nntp-server-buffer))
    (erase-buffer)
    (if (and (not gnus-nov-is-evil)
             (not nntp-nov-is-evil)
             (nntp-retrieve-headers-with-xover articles fetch-old))
        ;; We successfully retrieved the headers via XOVER.
        'nov
      ;; XOVER didn't work, so we do it the hard, slow and inefficient
      ;; way.  
      (let ((number (length articles))
            (count 0)
            (received 0)
            (last-point (point-min))
            (buf (nntp-find-connection-buffer nntp-server-buffer))
            (nntp-inhibit-erase t))
        ;; Send HEAD command.
        (while articles
          (nntp-send-command 
           nil
           "HEAD" (if (numberp (car articles))
                      (int-to-string (car articles))
                    ;; `articles' is either a list of article numbers
                    ;; or a list of article IDs.
                    (car articles)))
          (setq articles (cdr articles)
                count (1+ count))
          ;; Every 400 header requests we have to read the stream in
          ;; order to avoid deadlocks.
          (when (or (null articles)     ;All requests have been sent.
                    (zerop (% count nntp-maximum-request)))
            (nntp-accept-response)
            (while (progn
                     (progn
                       (set-buffer buf)
                       (goto-char last-point))
                     ;; Count replies.