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676 lines
21 KiB
EmacsLisp
676 lines
21 KiB
EmacsLisp
;;; nntp.el --- NNTP (RFC977) Interface for GNU Emacs
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;; Copyright (C) 1987, 1988, 1989, 1990, 1992 Free Software Foundation, Inc.
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;; Author: Masanobu UMEDA <umerin@flab.flab.fujitsu.junet>
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;; Keywords: news
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;; This file is part of GNU Emacs.
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;; GNU Emacs is free software; you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation; either version 2, or (at your option)
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;; any later version.
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;; GNU Emacs is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;; You should have received a copy of the GNU General Public License
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;; along with GNU Emacs; see the file COPYING. If not, write to
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;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
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;;; Commentary:
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;; This implementation is tested on both 1.2a and 1.5 version of the
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;; NNTP package.
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;; Troubleshooting of NNTP
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;;
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;; (1) Select routine may signal an error or fall into infinite loop
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;; while waiting for the server response. In this case, you'd better
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;; not use byte-compiled codes but original source. If you still have
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;; a problems with it, set the variable `nntp-buggy-select' to T.
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;;
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;; (2) Emacs may hang up while retrieving headers since too many
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;; requests have been sent to the NNTP server without reading their
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;; replies. In this case, reduce the number of the requests sent to
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;; the server at one time by setting the variable
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;; `nntp-maximum-request' to a lower value.
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;;
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;; (3) If the TCP/IP stream (open-network-stream) is not supported by
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;; emacs, compile and install `tcp.el' and `tcp.c' which is an
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;; emulation program of the stream. If you modified `tcp.c' for your
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;; system, please send me the diffs. I'll include some of them in the
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;; future releases.
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;;; Code:
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(defvar nntp-server-hook nil
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"*Hooks for the NNTP server.
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If the kanji code of the NNTP server is different from the local kanji
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code, the correct kanji code of the buffer associated with the NNTP
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server must be specified as follows:
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(setq nntp-server-hook
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'(lambda ()
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;; Server's Kanji code is EUC (NEmacs hack).
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(make-local-variable 'kanji-fileio-code)
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(setq kanji-fileio-code 0)))
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If you'd like to change something depending on the server in this
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hook, use the variable `nntp-server-name'.")
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(defvar nntp-buggy-select (memq system-type '(usg-unix-v fujitsu-uts))
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"*T if your select routine is buggy.
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If the select routine signals error or fall into infinite loop while
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waiting for the server response, the variable must be set to t. In
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case of Fujitsu UTS, it is set to T since `accept-process-output'
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doesn't work properly.")
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(defvar nntp-maximum-request 400
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"*The maximum number of the requests sent to the NNTP server at one time.
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If Emacs hangs up while retrieving headers, set the variable to a
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lower value.")
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(defvar nntp-large-newsgroup 50
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"*The number of the articles which indicates a large newsgroup.
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If the number of the articles is greater than the value, verbose
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messages will be shown to indicate the current status.")
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(defconst nntp-version "NNTP 3.10"
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"Version numbers of this version of NNTP.")
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(defvar nntp-server-name nil
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"The name of the host running NNTP server.")
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(defvar nntp-server-buffer nil
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"Buffer associated with NNTP server process.")
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(defvar nntp-server-process nil
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"The NNTP server process.
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You'd better not use this variable in NNTP front-end program but
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instead use `nntp-server-buffer'.")
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(defvar nntp-status-message-string nil
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"Save the server response message.
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You'd better not use this variable in NNTP front-end program but
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instead call function `nntp-status-message' to get status message.")
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;;;
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;;; Extended Command for retrieving many headers.
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;;;
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;; Retrieving lots of headers by sending command asynchronously.
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;; Access functions to headers are defined as macro.
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(defmacro nntp-header-number (header)
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"Return article number in HEADER."
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(` (aref (, header) 0)))
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(defmacro nntp-set-header-number (header number)
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"Set article number of HEADER to NUMBER."
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(` (aset (, header) 0 (, number))))
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(defmacro nntp-header-subject (header)
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"Return subject string in HEADER."
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(` (aref (, header) 1)))
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(defmacro nntp-set-header-subject (header subject)
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"Set article subject of HEADER to SUBJECT."
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(` (aset (, header) 1 (, subject))))
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(defmacro nntp-header-from (header)
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"Return author string in HEADER."
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(` (aref (, header) 2)))
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(defmacro nntp-set-header-from (header from)
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"Set article author of HEADER to FROM."
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(` (aset (, header) 2 (, from))))
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(defmacro nntp-header-xref (header)
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"Return xref string in HEADER."
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(` (aref (, header) 3)))
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(defmacro nntp-set-header-xref (header xref)
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"Set article xref of HEADER to xref."
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(` (aset (, header) 3 (, xref))))
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(defmacro nntp-header-lines (header)
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"Return lines in HEADER."
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(` (aref (, header) 4)))
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(defmacro nntp-set-header-lines (header lines)
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"Set article lines of HEADER to LINES."
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(` (aset (, header) 4 (, lines))))
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(defmacro nntp-header-date (header)
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"Return date in HEADER."
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(` (aref (, header) 5)))
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(defmacro nntp-set-header-date (header date)
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"Set article date of HEADER to DATE."
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(` (aset (, header) 5 (, date))))
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(defmacro nntp-header-id (header)
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"Return Id in HEADER."
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(` (aref (, header) 6)))
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(defmacro nntp-set-header-id (header id)
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"Set article Id of HEADER to ID."
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(` (aset (, header) 6 (, id))))
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(defmacro nntp-header-references (header)
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"Return references in HEADER."
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(` (aref (, header) 7)))
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(defmacro nntp-set-header-references (header ref)
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"Set article references of HEADER to REF."
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(` (aset (, header) 7 (, ref))))
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(defun nntp-retrieve-headers (sequence)
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"Return list of article headers specified by SEQUENCE of article id.
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The format of list is
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`([NUMBER SUBJECT FROM XREF LINES DATE MESSAGE-ID REFERENCES] ...)'.
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Reader macros for the vector are defined as `nntp-header-FIELD'.
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Writer macros for the vector are defined as `nntp-set-header-FIELD'.
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News group must be selected before calling me."
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(save-excursion
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(set-buffer nntp-server-buffer)
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(erase-buffer)
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(let ((number (length sequence))
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(last-point (point-min))
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(received 0)
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(count 0)
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(headers nil) ;Result list.
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(article 0)
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(subject nil)
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(message-id)
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(from nil)
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(xref nil)
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(lines 0)
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(date nil)
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(references nil))
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;; Send HEAD command.
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(while sequence
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(nntp-send-strings-to-server "HEAD" (car sequence))
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(setq sequence (cdr sequence))
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(setq count (1+ count))
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;; Every 400 header requests we have to read stream in order
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;; to avoid deadlock.
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(if (or (null sequence) ;All requests have been sent.
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(zerop (% count nntp-maximum-request)))
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(progn
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(accept-process-output)
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(while (progn
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(goto-char last-point)
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;; Count replies.
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(while (re-search-forward "^[0-9]" nil t)
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(setq received (1+ received)))
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(setq last-point (point))
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(< received count))
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;; If number of headers is greater than 100, give
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;; informative messages.
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(and (numberp nntp-large-newsgroup)
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(> number nntp-large-newsgroup)
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(zerop (% received 20))
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(message "NNTP: %d%% of headers received."
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(/ (* received 100) number)))
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(nntp-accept-response))
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))
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)
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;; Wait for text of last command.
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(goto-char (point-max))
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(re-search-backward "^[0-9]" nil t)
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(if (looking-at "^[23]")
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(while (progn
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(goto-char (- (point-max) 3))
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(not (looking-at "^\\.\r$")))
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(nntp-accept-response)))
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(and (numberp nntp-large-newsgroup)
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(> number nntp-large-newsgroup)
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(message "NNTP: 100%% of headers received."))
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;; Now all of replies are received.
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(setq received number)
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;; First, fold continuation lines.
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(goto-char (point-min))
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(while (re-search-forward "\\(\r?\n[ \t]+\\)+" nil t)
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(replace-match " " t t))
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;;(delete-non-matching-lines
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;; "^Subject:\\|^Xref:\\|^From:\\|^Lines:\\|^Date:\\|^References:\\|^[23]")
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(and (numberp nntp-large-newsgroup)
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(> number nntp-large-newsgroup)
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(message "NNTP: Parsing headers..."))
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;; Then examines replies.
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(goto-char (point-min))
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(while (not (eobp))
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(cond ((looking-at "^[23][0-9][0-9][ \t]+\\([0-9]+\\)[ \t]+\\(<[^>]+>\\)")
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(setq article
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(string-to-int
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(buffer-substring (match-beginning 1) (match-end 1))))
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(setq message-id
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(buffer-substring (match-beginning 2) (match-end 2)))
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(forward-line 1)
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;; Set default value.
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(setq subject nil)
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(setq xref nil)
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(setq from nil)
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(setq lines 0)
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(setq date nil)
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(setq references nil)
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;; Thanks go to mly@AI.MIT.EDU (Richard Mlynarik)
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(while (and (not (eobp))
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(not (memq (following-char) '(?2 ?3))))
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(if (looking-at "\\(From\\|Subject\\|Date\\|Lines\\|Xref\\|References\\):[ \t]+\\([^ \t\n]+.*\\)\r$")
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(let ((s (buffer-substring
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(match-beginning 2) (match-end 2)))
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(c (char-after (match-beginning 0))))
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;; We don't have to worry about letter case.
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(cond ((char-equal c ?F) ;From:
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(setq from s))
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((char-equal c ?S) ;Subject:
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(setq subject s))
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((char-equal c ?D) ;Date:
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(setq date s))
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((char-equal c ?L) ;Lines:
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(setq lines (string-to-int s)))
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((char-equal c ?X) ;Xref:
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(setq xref s))
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((char-equal c ?R) ;References:
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(setq references s))
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)))
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(forward-line 1))
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;; Finished to parse one header.
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(if (null subject)
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(setq subject "(None)"))
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(if (null from)
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(setq from "(Unknown User)"))
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(setq headers
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(cons (vector article subject from
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xref lines date
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message-id references) headers))
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)
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(t (forward-line 1))
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)
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(setq received (1- received))
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(and (numberp nntp-large-newsgroup)
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(> number nntp-large-newsgroup)
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(zerop (% received 20))
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(message "NNTP: Parsing headers... %d%%"
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(/ (* received 100) number)))
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)
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(and (numberp nntp-large-newsgroup)
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(> number nntp-large-newsgroup)
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(message "NNTP: Parsing headers... done"))
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(nreverse headers)
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)))
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;;;
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;;; Raw Interface to Network News Transfer Protocol (RFC977).
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;;;
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(defun nntp-open-server (host &optional service)
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"Open news server on HOST.
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If HOST is nil, use value of environment variable `NNTPSERVER'.
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If optional argument SERVICE is non-nil, open by the service name."
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(let ((host (or host (getenv "NNTPSERVER")))
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(status nil))
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(setq nntp-status-message-string "")
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(cond ((and host (nntp-open-server-internal host service))
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(setq status (nntp-wait-for-response "^[23].*\r$"))
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;; Do check unexpected close of connection.
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;; Suggested by feldmark@hanako.stars.flab.fujitsu.junet.
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(if status
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(set-process-sentinel nntp-server-process
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'nntp-default-sentinel)
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;; We have to close connection here, since function
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;; `nntp-server-opened' may return incorrect status.
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(nntp-close-server-internal)
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))
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((null host)
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(setq nntp-status-message-string "NNTP server is not specified."))
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)
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status
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))
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(defun nntp-close-server ()
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"Close news server."
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(unwind-protect
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(progn
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;; Un-set default sentinel function before closing connection.
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(and nntp-server-process
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(eq 'nntp-default-sentinel
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(process-sentinel nntp-server-process))
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(set-process-sentinel nntp-server-process nil))
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;; We cannot send QUIT command unless the process is running.
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(if (nntp-server-opened)
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(nntp-send-command nil "QUIT"))
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)
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(nntp-close-server-internal)
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))
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(fset 'nntp-request-quit (symbol-function 'nntp-close-server))
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(defun nntp-server-opened ()
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"Return server process status, T or NIL.
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If the stream is opened, return T, otherwise return NIL."
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(and nntp-server-process
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(memq (process-status nntp-server-process) '(open run))))
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(defun nntp-status-message ()
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"Return server status response as string."
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(if (and nntp-status-message-string
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;; NNN MESSAGE
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(string-match "[0-9][0-9][0-9][ \t]+\\([^\r]*\\).*$"
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nntp-status-message-string))
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(substring nntp-status-message-string (match-beginning 1) (match-end 1))
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;; Empty message if nothing.
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""
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))
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(defun nntp-request-article (id)
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"Select article by message ID (or number)."
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(prog1
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;; If NEmacs, end of message may look like: "\256\215" (".^M")
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(nntp-send-command "^\\.\r$" "ARTICLE" id)
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(nntp-decode-text)
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))
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(defun nntp-request-body (id)
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"Select article body by message ID (or number)."
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(prog1
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;; If NEmacs, end of message may look like: "\256\215" (".^M")
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(nntp-send-command "^\\.\r$" "BODY" id)
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(nntp-decode-text)
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))
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(defun nntp-request-head (id)
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"Select article head by message ID (or number)."
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(prog1
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(nntp-send-command "^\\.\r$" "HEAD" id)
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(nntp-decode-text)
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))
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(defun nntp-request-stat (id)
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"Select article by message ID (or number)."
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(nntp-send-command "^[23].*\r$" "STAT" id))
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(defun nntp-request-group (group)
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"Select news GROUP."
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;; 1.2a NNTP's group command is buggy. "^M" (\r) is not appended to
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;; end of the status message.
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(nntp-send-command "^[23].*$" "GROUP" group))
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(defun nntp-request-list ()
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"List valid newsgoups."
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(prog1
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(nntp-send-command "^\\.\r$" "LIST")
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(nntp-decode-text)
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))
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(defun nntp-request-last ()
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"Set current article pointer to the previous article in the current news group."
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(nntp-send-command "^[23].*\r$" "LAST"))
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(defun nntp-request-next ()
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"Advance current article pointer."
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(nntp-send-command "^[23].*\r$" "NEXT"))
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(defun nntp-request-post ()
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"Post a new news in current buffer."
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(if (nntp-send-command "^[23].*\r$" "POST")
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(progn
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(nntp-encode-text)
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(nntp-send-region-to-server (point-min) (point-max))
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;; 1.2a NNTP's post command is buggy. "^M" (\r) is not
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;; appended to end of the status message.
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(nntp-wait-for-response "^[23].*$")
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)))
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(defun nntp-default-sentinel (proc status)
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"Default sentinel function for NNTP server process."
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(if (and nntp-server-process
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(not (nntp-server-opened)))
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(error "NNTP: Connection closed.")
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))
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;; Encoding and decoding of NNTP text.
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(defun nntp-decode-text ()
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"Decode text transmitted by NNTP.
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0. Delete status line.
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1. Delete `^M' at end of line.
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2. Delete `.' at end of buffer (end of text mark).
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3. Delete `.' at beginning of line."
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(save-excursion
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(set-buffer nntp-server-buffer)
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;; Insert newline at end of buffer.
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(goto-char (point-max))
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(if (not (bolp))
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(insert "\n"))
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;; Delete status line.
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(goto-char (point-min))
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(delete-region (point) (progn (forward-line 1) (point)))
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;; Delete `^M' at end of line.
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;; (replace-regexp "\r$" "")
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(while (not (eobp))
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(end-of-line)
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(if (= (preceding-char) ?\r)
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(delete-char -1))
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(forward-line 1)
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)
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;; Delete `.' at end of buffer (end of text mark).
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(goto-char (point-max))
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(forward-line -1) ;(beginning-of-line)
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(if (looking-at "^\\.$")
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(delete-region (point) (progn (forward-line 1) (point))))
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;; Replace `..' at beginning of line with `.'.
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(goto-char (point-min))
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;; (replace-regexp "^\\.\\." ".")
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(while (search-forward "\n.." nil t)
|
||
(delete-char -1))
|
||
))
|
||
|
||
(defun nntp-encode-text ()
|
||
"Encode text in current buffer for NNTP transmission.
|
||
1. Insert `.' at beginning of line.
|
||
2. Insert `.' at end of buffer (end of text mark)."
|
||
(save-excursion
|
||
;; Insert newline at end of buffer.
|
||
(goto-char (point-max))
|
||
(if (not (bolp))
|
||
(insert "\n"))
|
||
;; Replace `.' at beginning of line with `..'.
|
||
(goto-char (point-min))
|
||
;; (replace-regexp "^\\." "..")
|
||
(while (search-forward "\n." nil t)
|
||
(insert "."))
|
||
;; Insert `.' at end of buffer (end of text mark).
|
||
(goto-char (point-max))
|
||
(insert ".\n")
|
||
))
|
||
|
||
|
||
;;;
|
||
;;; Synchronous Communication with NNTP Server.
|
||
;;;
|
||
|
||
(defun nntp-send-command (response cmd &rest args)
|
||
"Wait for server RESPONSE after sending CMD and optional ARGS to server."
|
||
(save-excursion
|
||
;; Clear communication buffer.
|
||
(set-buffer nntp-server-buffer)
|
||
(erase-buffer)
|
||
(apply 'nntp-send-strings-to-server cmd args)
|
||
(if response
|
||
(nntp-wait-for-response response)
|
||
t)
|
||
))
|
||
|
||
(defun nntp-wait-for-response (regexp)
|
||
"Wait for server response which matches REGEXP."
|
||
(save-excursion
|
||
(let ((status t)
|
||
(wait t))
|
||
(set-buffer nntp-server-buffer)
|
||
;; Wait for status response (RFC977).
|
||
;; 1xx - Informative message.
|
||
;; 2xx - Command ok.
|
||
;; 3xx - Command ok so far, send the rest of it.
|
||
;; 4xx - Command was correct, but couldn't be performed for some
|
||
;; reason.
|
||
;; 5xx - Command unimplemented, or incorrect, or a serious
|
||
;; program error occurred.
|
||
(nntp-accept-response)
|
||
(while wait
|
||
(goto-char (point-min))
|
||
(cond ((looking-at "[23]")
|
||
(setq wait nil))
|
||
((looking-at "[45]")
|
||
(setq status nil)
|
||
(setq wait nil))
|
||
(t (nntp-accept-response))
|
||
))
|
||
;; Save status message.
|
||
(end-of-line)
|
||
(setq nntp-status-message-string
|
||
(buffer-substring (point-min) (point)))
|
||
(if status
|
||
(progn
|
||
(setq wait t)
|
||
(while wait
|
||
(goto-char (point-max))
|
||
(forward-line -1) ;(beginning-of-line)
|
||
;;(message (buffer-substring
|
||
;; (point)
|
||
;; (save-excursion (end-of-line) (point))))
|
||
(if (looking-at regexp)
|
||
(setq wait nil)
|
||
(message "NNTP: Reading...")
|
||
(nntp-accept-response)
|
||
(message "")
|
||
))
|
||
;; Successfully received server response.
|
||
t
|
||
))
|
||
)))
|
||
|
||
|
||
;;;
|
||
;;; Low-Level Interface to NNTP Server.
|
||
;;;
|
||
|
||
(defun nntp-send-strings-to-server (&rest strings)
|
||
"Send list of STRINGS to news server as command and its arguments."
|
||
(let ((cmd (car strings))
|
||
(strings (cdr strings)))
|
||
;; Command and each argument must be separeted by one or more spaces.
|
||
(while strings
|
||
(setq cmd (concat cmd " " (car strings)))
|
||
(setq strings (cdr strings)))
|
||
;; Command line must be terminated by a CR-LF.
|
||
(process-send-string nntp-server-process (concat cmd "\n"))
|
||
))
|
||
|
||
(defun nntp-send-region-to-server (begin end)
|
||
"Send current buffer region (from BEGIN to END) to news server."
|
||
(save-excursion
|
||
;; We have to work in the buffer associated with NNTP server
|
||
;; process because of NEmacs hack.
|
||
(copy-to-buffer nntp-server-buffer begin end)
|
||
(set-buffer nntp-server-buffer)
|
||
(setq begin (point-min))
|
||
(setq end (point-max))
|
||
;; `process-send-region' does not work if text to be sent is very
|
||
;; large. I don't know maximum size of text sent correctly.
|
||
(let ((last nil)
|
||
(size 100)) ;Size of text sent at once.
|
||
(save-restriction
|
||
(narrow-to-region begin end)
|
||
(goto-char begin)
|
||
(while (not (eobp))
|
||
;;(setq last (min end (+ (point) size)))
|
||
;; NEmacs gets confused if character at `last' is Kanji.
|
||
(setq last (save-excursion
|
||
(goto-char (min end (+ (point) size)))
|
||
(or (eobp) (forward-char 1)) ;Adjust point
|
||
(point)))
|
||
(process-send-region nntp-server-process (point) last)
|
||
;; I don't know whether the next codes solve the known
|
||
;; problem of communication error of GNU Emacs.
|
||
(accept-process-output)
|
||
;;(sit-for 0)
|
||
(goto-char last)
|
||
)))
|
||
;; We cannot erase buffer, because reply may be received.
|
||
(delete-region begin end)
|
||
))
|
||
|
||
(defun nntp-open-server-internal (host &optional service)
|
||
"Open connection to news server on HOST by SERVICE (default is nntp)."
|
||
(save-excursion
|
||
;; Use TCP/IP stream emulation package if needed.
|
||
(or (fboundp 'open-network-stream)
|
||
(require 'tcp))
|
||
;; Initialize communication buffer.
|
||
(setq nntp-server-buffer (get-buffer-create " *nntpd*"))
|
||
(set-buffer nntp-server-buffer)
|
||
(buffer-flush-undo (current-buffer))
|
||
(erase-buffer)
|
||
(kill-all-local-variables)
|
||
(setq case-fold-search t) ;Should ignore case.
|
||
(setq nntp-server-process
|
||
(open-network-stream "nntpd" (current-buffer)
|
||
host (or service "nntp")))
|
||
(setq nntp-server-name host)
|
||
;; It is possible to change kanji-fileio-code in this hook.
|
||
(run-hooks 'nntp-server-hook)
|
||
;; Return the server process.
|
||
nntp-server-process
|
||
))
|
||
|
||
(defun nntp-close-server-internal ()
|
||
"Close connection to news server."
|
||
(if nntp-server-process
|
||
(delete-process nntp-server-process))
|
||
(if nntp-server-buffer
|
||
(kill-buffer nntp-server-buffer))
|
||
(setq nntp-server-buffer nil)
|
||
(setq nntp-server-process nil))
|
||
|
||
(defun nntp-accept-response ()
|
||
"Read response of server.
|
||
It is well-known that the communication speed will be much improved by
|
||
defining this function as macro."
|
||
;; To deal with server process exiting before
|
||
;; accept-process-output is called.
|
||
;; Suggested by Jason Venner <jason@violet.berkeley.edu>.
|
||
;; This is a copy of `nntp-default-sentinel'.
|
||
(or (memq (process-status nntp-server-process) '(open run))
|
||
(error "NNTP: Connection closed."))
|
||
(if nntp-buggy-select
|
||
(progn
|
||
;; We cannot use `accept-process-output'.
|
||
;; Fujitsu UTS requires messages during sleep-for. I don't know why.
|
||
(message "NNTP: Reading...")
|
||
(sleep-for 1)
|
||
(message ""))
|
||
(condition-case errorcode
|
||
(accept-process-output nntp-server-process)
|
||
(error
|
||
(cond ((string-equal "select error: Invalid argument" (nth 1 errorcode))
|
||
;; Ignore select error.
|
||
nil
|
||
)
|
||
(t
|
||
(signal (car errorcode) (cdr errorcode))))
|
||
))
|
||
))
|
||
|
||
(provide 'nntp)
|
||
|
||
;;; nntp.el ends here
|