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bc511a64f6
Most of this change is to boilerplate commentary such as license URLs. This change was prompted by ftp://ftp.gnu.org's going-away party, planned for November. Change these FTP URLs to https://ftp.gnu.org instead. Make similar changes for URLs to other organizations moving away from FTP. Also, change HTTP to HTTPS for URLs to gnu.org and fsf.org when this works, as this will further help defend against man-in-the-middle attacks (for this part I omitted the MS-DOS and MS-Windows sources and the test tarballs to keep the workload down). HTTPS is not fully working to lists.gnu.org so I left those URLs alone for now.
155 lines
5 KiB
EmacsLisp
155 lines
5 KiB
EmacsLisp
;;; gnus-bcklg.el --- backlog functions for Gnus
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;; Copyright (C) 1996-2017 Free Software Foundation, Inc.
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;; Author: Lars Magne Ingebrigtsen <larsi@gnus.org>
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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 3 of the License, or
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;; (at your option) 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. If not, see <https://www.gnu.org/licenses/>.
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;;; Commentary:
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;;; Code:
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(eval-when-compile (require 'cl))
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(require 'gnus)
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;;;
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;;; Buffering of read articles.
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;;;
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(defvar gnus-backlog-buffer " *Gnus Backlog*")
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(defvar gnus-backlog-articles nil)
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(defvar gnus-backlog-hashtb nil)
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(defun gnus-backlog-buffer ()
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"Return the backlog buffer."
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(or (get-buffer gnus-backlog-buffer)
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(with-current-buffer (gnus-get-buffer-create gnus-backlog-buffer)
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(buffer-disable-undo)
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(setq buffer-read-only t)
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(get-buffer gnus-backlog-buffer))))
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(defun gnus-backlog-setup ()
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"Initialize backlog variables."
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(unless gnus-backlog-hashtb
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(setq gnus-backlog-hashtb (gnus-make-hashtable 1024))))
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(gnus-add-shutdown 'gnus-backlog-shutdown 'gnus)
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(defun gnus-backlog-shutdown ()
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"Clear all backlog variables and buffers."
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(interactive)
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(when (get-buffer gnus-backlog-buffer)
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(gnus-kill-buffer gnus-backlog-buffer))
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(setq gnus-backlog-hashtb nil
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gnus-backlog-articles nil))
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(defun gnus-backlog-enter-article (group number buffer)
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(when (and (numberp number)
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(not (gnus-virtual-group-p group)))
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(gnus-backlog-setup)
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(let ((ident (intern (concat group ":" (int-to-string number))
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gnus-backlog-hashtb))
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b)
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(if (memq ident gnus-backlog-articles)
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() ; It's already kept.
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;; Remove the oldest article, if necessary.
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(and (numberp gnus-keep-backlog)
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(>= (length gnus-backlog-articles) gnus-keep-backlog)
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(gnus-backlog-remove-oldest-article))
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(push ident gnus-backlog-articles)
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;; Insert the new article.
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(with-current-buffer (gnus-backlog-buffer)
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(let (buffer-read-only)
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(goto-char (point-max))
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(unless (bolp)
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(insert "\n"))
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(setq b (point))
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(insert-buffer-substring buffer)
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;; Tag the beginning of the article with the ident.
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(if (> (point-max) b)
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(put-text-property b (1+ b) 'gnus-backlog ident)
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(gnus-error 3 "Article %d is blank" number))))))))
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(defun gnus-backlog-remove-oldest-article ()
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(with-current-buffer (gnus-backlog-buffer)
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(goto-char (point-min))
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(if (zerop (buffer-size))
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() ; The buffer is empty.
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(let ((ident (get-text-property (point) 'gnus-backlog))
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buffer-read-only)
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;; Remove the ident from the list of articles.
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(when ident
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(setq gnus-backlog-articles (delq ident gnus-backlog-articles)))
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;; Delete the article itself.
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(delete-region
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(point) (next-single-property-change
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(1+ (point)) 'gnus-backlog nil (point-max)))))))
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(defun gnus-backlog-remove-article (group number)
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"Remove article NUMBER in GROUP from the backlog."
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(when (numberp number)
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(gnus-backlog-setup)
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(let ((ident (intern (concat group ":" (int-to-string number))
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gnus-backlog-hashtb))
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beg end)
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(when (memq ident gnus-backlog-articles)
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;; It was in the backlog.
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(with-current-buffer (gnus-backlog-buffer)
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(let (buffer-read-only)
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(when (setq beg (text-property-any
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(point-min) (point-max) 'gnus-backlog
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ident))
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;; Find the end (i. e., the beginning of the next article).
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(setq end
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(next-single-property-change
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(1+ beg) 'gnus-backlog (current-buffer) (point-max)))
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(delete-region beg end)
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;; Return success.
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t))
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(setq gnus-backlog-articles (delq ident gnus-backlog-articles)))))))
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(defun gnus-backlog-request-article (group number &optional buffer)
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(when (and (numberp number)
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(not (gnus-virtual-group-p group)))
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(gnus-backlog-setup)
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(let ((ident (intern (concat group ":" (int-to-string number))
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gnus-backlog-hashtb))
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beg end)
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(when (memq ident gnus-backlog-articles)
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;; It was in the backlog.
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(with-current-buffer (gnus-backlog-buffer)
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(if (not (setq beg (text-property-any
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(point-min) (point-max) 'gnus-backlog
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ident)))
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;; It wasn't in the backlog after all.
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(ignore
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(setq gnus-backlog-articles (delq ident gnus-backlog-articles)))
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;; Find the end (i. e., the beginning of the next article).
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(setq end
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(next-single-property-change
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(1+ beg) 'gnus-backlog (current-buffer) (point-max)))))
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(with-current-buffer (or buffer (current-buffer))
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(let ((inhibit-read-only t))
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(erase-buffer)
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(insert-buffer-substring gnus-backlog-buffer beg end)))
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t))))
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(provide 'gnus-bcklg)
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;;; gnus-bcklg.el ends here
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