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141 lines
4.7 KiB
EmacsLisp
141 lines
4.7 KiB
EmacsLisp
;;; gnus-bcklg.el --- backlog functions for Gnus
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;; Copyright (C) 1996-2020 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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;; The backlog caches the text of a certain number of read articles in
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;; a separate buffer, so they can be retrieved quickly if the user
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;; opens them again. Also see `gnus-keep-backlog'.
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;;; Code:
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(require 'gnus)
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(defvar gnus-backlog-buffer " *Gnus Backlog*")
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(defvar gnus-backlog-articles '())
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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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(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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(gnus-kill-buffer gnus-backlog-buffer)
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(setq 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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(let ((ident (format "%s:%d" group number))
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b)
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(unless (member ident gnus-backlog-articles) ; 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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(unless (zerop (buffer-size)) ; 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
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(delete 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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(let ((ident (format "%s:%d" group number))
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beg)
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(when (member 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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(save-excursion
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(let (buffer-read-only)
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(goto-char (point-min))
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(when (setq beg (gnus-text-property-search
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'gnus-backlog ident))
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;; Find the end (i. e., the beginning of the next article).
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(goto-char
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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 (point))
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;; Return success.
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t)))
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(setq gnus-backlog-articles
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(delete 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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(let ((ident (format "%s:%d" group number))
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beg end)
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(when (member 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 (gnus-text-property-search
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'gnus-backlog 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
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(delete 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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