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376 lines
12 KiB
EmacsLisp
376 lines
12 KiB
EmacsLisp
;;; Spool access using NNTP for GNU Emacs
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;; Copyright (C) 1988, 1989 Fujitsu Laboratories LTD.
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;; Copyright (C) 1988, 1989, 1990 Masanobu UMEDA
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;; $Header: nnspool.el,v 1.10 90/03/23 13:25:25 umerin Locked $
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;; This file is part of GNU Emacs.
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;; GNU Emacs is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY. No author or distributor
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;; accepts responsibility to anyone for the consequences of using it
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;; or for whether it serves any particular purpose or works at all,
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;; unless he says so in writing. Refer to the GNU Emacs General Public
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;; License for full details.
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;; Everyone is granted permission to copy, modify and redistribute
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;; GNU Emacs, but only under the conditions described in the
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;; GNU Emacs General Public License. A copy of this license is
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;; supposed to have been given to you along with GNU Emacs so you
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;; can know your rights and responsibilities. It should be in a
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;; file named COPYING. Among other things, the copyright notice
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;; and this notice must be preserved on all copies.
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(provide 'nnspool)
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(require 'nntp)
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(defvar nnspool-inews-program news-inews-program
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"*Program to post news.")
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(defvar nnspool-inews-switches '("-h")
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"*Switches for nnspool-request-post to pass to `inews' for posting news.")
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(defvar nnspool-spool-directory news-path
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"*Local news spool directory.")
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(defvar nnspool-active-file "/usr/lib/news/active"
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"*Local news active file.")
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(defvar nnspool-history-file "/usr/lib/news/history"
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"*Local news history file.")
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(defconst nnspool-version "NNSPOOL 1.10"
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"Version numbers of this version of NNSPOOL.")
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(defvar nnspool-current-directory nil
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"Current news group directory.")
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;;;
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;;; Replacement of Extended Command for retrieving many headers.
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;;;
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(defun nnspool-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 ((file nil)
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(number (length sequence))
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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 nil)
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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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(while sequence
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;;(nntp-send-strings-to-server "HEAD" (car sequence))
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(setq article (car sequence))
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(setq file
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(concat nnspool-current-directory (prin1-to-string article)))
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(if (and (file-exists-p file)
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(not (file-directory-p file)))
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(progn
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(erase-buffer)
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(insert-file-contents file)
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;; Make message body invisible.
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(goto-char (point-min))
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(search-forward "\n\n" nil 'move)
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(narrow-to-region (point-min) (point))
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;; 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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;; Make it possible to search for `\nFIELD'.
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(goto-char (point-min))
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(insert "\n")
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;; Extract From:
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(goto-char (point-min))
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(if (search-forward "\nFrom: " nil t)
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(setq from (buffer-substring
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(point)
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(save-excursion (end-of-line) (point))))
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(setq from "(Unknown User)"))
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;; Extract Subject:
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(goto-char (point-min))
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(if (search-forward "\nSubject: " nil t)
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(setq subject (buffer-substring
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(point)
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(save-excursion (end-of-line) (point))))
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(setq subject "(None)"))
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;; Extract Message-ID:
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(goto-char (point-min))
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(if (search-forward "\nMessage-ID: " nil t)
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(setq message-id (buffer-substring
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(point)
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(save-excursion (end-of-line) (point))))
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(setq message-id nil))
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;; Extract Date:
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(goto-char (point-min))
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(if (search-forward "\nDate: " nil t)
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(setq date (buffer-substring
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(point)
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(save-excursion (end-of-line) (point))))
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(setq date nil))
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;; Extract Lines:
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(goto-char (point-min))
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(if (search-forward "\nLines: " nil t)
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(setq lines (string-to-int
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(buffer-substring
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(point)
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(save-excursion (end-of-line) (point)))))
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(setq lines 0))
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;; Extract Xref:
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(goto-char (point-min))
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(if (search-forward "\nXref: " nil t)
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(setq xref (buffer-substring
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(point)
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(save-excursion (end-of-line) (point))))
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(setq xref nil))
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;; Extract References:
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(goto-char (point-min))
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(if (search-forward "\nReferences: " nil t)
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(setq references (buffer-substring
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(point)
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(save-excursion (end-of-line) (point))))
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(setq references nil))
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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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(setq sequence (cdr sequence))
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(setq count (1+ count))
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(and (numberp nntp-large-newsgroup)
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(> number nntp-large-newsgroup)
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(zerop (% count 20))
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(message "NNSPOOL: %d%% of headers received."
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(/ (* count 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 "NNSPOOL: 100%% of headers received."))
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(nreverse headers)
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)))
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;;;
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;;; Replacement of NNTP Raw Interface.
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;;;
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(defun nnspool-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 (file-directory-p nnspool-spool-directory)
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(file-exists-p nnspool-active-file)
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(string-equal host (system-name)))
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(setq status (nnspool-open-server-internal host service)))
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((string-equal host (system-name))
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(setq nntp-status-message-string
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(format "%s has no news spool. Goodbye." host)))
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((null host)
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(setq nntp-status-message-string "NNTP server is not specified."))
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(t
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(setq nntp-status-message-string
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(format "NNSPOOL: cannot talk to %s." host)))
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)
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status
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))
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(defun nnspool-close-server ()
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"Close news server."
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(nnspool-close-server-internal))
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(fset 'nnspool-request-quit (symbol-function 'nnspool-close-server))
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(defun nnspool-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-buffer
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(get-buffer nntp-server-buffer)))
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(defun nnspool-status-message ()
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"Return server status response as string."
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nntp-status-message-string
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)
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(defun nnspool-request-article (id)
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"Select article by message ID (or number)."
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(let ((file (if (stringp id)
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(nnspool-find-article-by-message-id id)
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(concat nnspool-current-directory (prin1-to-string id)))))
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(if (and (stringp file)
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(file-exists-p file)
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(not (file-directory-p file)))
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(save-excursion
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(nnspool-find-file file)))
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))
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(defun nnspool-request-body (id)
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"Select article body by message ID (or number)."
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(if (nnspool-request-article id)
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(save-excursion
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(set-buffer nntp-server-buffer)
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(goto-char (point-min))
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(if (search-forward "\n\n" nil t)
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(delete-region (point-min) (point)))
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t
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)
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))
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(defun nnspool-request-head (id)
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"Select article head by message ID (or number)."
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(if (nnspool-request-article id)
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(save-excursion
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(set-buffer nntp-server-buffer)
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(goto-char (point-min))
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(if (search-forward "\n\n" nil t)
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(delete-region (1- (point)) (point-max)))
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t
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)
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))
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(defun nnspool-request-stat (id)
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"Select article by message ID (or number)."
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(error "NNSPOOL: STAT is not implemented."))
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(defun nnspool-request-group (group)
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"Select news GROUP."
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(let ((pathname (nnspool-article-pathname
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(nnspool-replace-chars-in-string group ?. ?/))))
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(if (file-directory-p pathname)
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(setq nnspool-current-directory pathname))
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))
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(defun nnspool-request-list ()
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"List valid newsgoups."
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(save-excursion
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(nnspool-find-file nnspool-active-file)))
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(defun nnspool-request-last ()
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"Set current article pointer to the previous article
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in the current news group."
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(error "NNSPOOL: LAST is not implemented."))
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(defun nnspool-request-next ()
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"Advance current article pointer."
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(error "NNSPOOL: NEXT is not implemented."))
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(defun nnspool-request-post ()
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"Post a new news in current buffer."
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(save-excursion
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;; We have to work in the server buffer because of NEmacs hack.
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(copy-to-buffer nntp-server-buffer (point-min) (point-max))
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(set-buffer nntp-server-buffer)
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(apply 'call-process-region
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(point-min) (point-max)
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nnspool-inews-program 'delete t nil nnspool-inews-switches)
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(prog1
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(or (zerop (buffer-size))
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;; If inews returns strings, it must be error message
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;; unless SPOOLNEWS is defined.
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;; This condition is very weak, but there is no good rule
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;; identifying errors when SPOOLNEWS is defined.
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;; Suggested by ohm@kaba.junet.
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(string-match "spooled" (buffer-string)))
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;; Make status message by unfolding lines.
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(subst-char-in-region (point-min) (point-max) ?\n ?\\ 'noundo)
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(setq nntp-status-message-string (buffer-string))
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(erase-buffer))
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))
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;;;
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;;; Replacement of Low-Level Interface to NNTP Server.
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;;;
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(defun nnspool-open-server-internal (host &optional service)
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"Open connection to news server on HOST by SERVICE (default is nntp)."
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(save-excursion
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(if (not (string-equal host (system-name)))
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(error "NNSPOOL: cannot talk to %s." host))
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;; Initialize communication buffer.
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(setq nntp-server-buffer (get-buffer-create " *nntpd*"))
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(set-buffer nntp-server-buffer)
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(buffer-flush-undo (current-buffer))
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(erase-buffer)
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(kill-all-local-variables)
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(setq case-fold-search t) ;Should ignore case.
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(setq nntp-server-process nil)
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(setq nntp-server-name host)
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;; It is possible to change kanji-fileio-code in this hook.
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(run-hooks 'nntp-server-hook)
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t
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))
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(defun nnspool-close-server-internal ()
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"Close connection to news server."
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(if (get-file-buffer nnspool-history-file)
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(kill-buffer (get-file-buffer nnspool-history-file)))
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(if nntp-server-buffer
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(kill-buffer nntp-server-buffer))
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(setq nntp-server-buffer nil)
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(setq nntp-server-process nil))
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(defun nnspool-find-article-by-message-id (id)
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"Return full pathname of an artilce identified by message-ID."
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(save-excursion
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(let ((buffer (get-file-buffer nnspool-history-file)))
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(if buffer
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(set-buffer buffer)
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;; Finding history file may take lots of time.
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(message "Reading history file...")
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(set-buffer (find-file-noselect nnspool-history-file))
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(message "Reading history file... done")))
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;; Search from end of the file. I think this is much faster than
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;; do from the beginning of the file.
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(goto-char (point-max))
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(if (re-search-backward
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(concat "^" (regexp-quote id)
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"[ \t].*[ \t]\\([^ \t/]+\\)/\\([0-9]+\\)[ \t]*$") nil t)
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(let ((group (buffer-substring (match-beginning 1) (match-end 1)))
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(number (buffer-substring (match-beginning 2) (match-end 2))))
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(concat (nnspool-article-pathname
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(nnspool-replace-chars-in-string group ?. ?/))
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number))
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)))
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(defun nnspool-find-file (file)
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"Insert FILE in server buffer safely."
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(set-buffer nntp-server-buffer)
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(erase-buffer)
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(condition-case ()
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(progn (insert-file-contents file) t)
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(file-error nil)
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))
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(defun nnspool-article-pathname (group)
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"Make pathname for GROUP."
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(concat (file-name-as-directory nnspool-spool-directory) group "/"))
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(defun nnspool-replace-chars-in-string (string from to)
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"Replace characters in STRING from FROM to TO."
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(let ((string (substring string 0)) ;Copy string.
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(len (length string))
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(idx 0))
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;; Replace all occurence of FROM with TO.
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(while (< idx len)
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(if (= (aref string idx) from)
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(aset string idx to))
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(setq idx (1+ idx)))
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string
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))
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