--- /dev/null
+;;; gnus-bcklg.el --- backlog functions for Gnus
+
+;; Copyright (C) 1996-2016 Free Software Foundation, Inc.
+
+;; Author: Lars Magne Ingebrigtsen <larsi@gnus.org>
+;; Keywords: news
+
+;; This file is part of GNU Emacs.
+
+;; GNU Emacs is free software: you can redistribute it and/or modify
+;; it under the terms of the GNU General Public License as published by
+;; the Free Software Foundation, either version 3 of the License, or
+;; (at your option) any later version.
+
+;; GNU Emacs is distributed in the hope that it will be useful,
+;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+;; GNU General Public License for more details.
+
+;; You should have received a copy of the GNU General Public License
+;; along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>.
+
+;;; Commentary:
+
+;;; Code:
+
+(eval-when-compile (require 'cl))
+
+(require 'gnus)
+
+;;;
+;;; Buffering of read articles.
+;;;
+
+(defvar gnus-backlog-buffer " *Gnus Backlog*")
+(defvar gnus-backlog-articles nil)
+(defvar gnus-backlog-hashtb nil)
+
+(defun gnus-backlog-buffer ()
+ "Return the backlog buffer."
+ (or (get-buffer gnus-backlog-buffer)
+ (with-current-buffer (gnus-get-buffer-create gnus-backlog-buffer)
+ (buffer-disable-undo)
+ (setq buffer-read-only t)
+ (get-buffer gnus-backlog-buffer))))
+
+(defun gnus-backlog-setup ()
+ "Initialize backlog variables."
+ (unless gnus-backlog-hashtb
+ (setq gnus-backlog-hashtb (gnus-make-hashtable 1024))))
+
+(gnus-add-shutdown 'gnus-backlog-shutdown 'gnus)
+
+(defun gnus-backlog-shutdown ()
+ "Clear all backlog variables and buffers."
+ (interactive)
+ (when (get-buffer gnus-backlog-buffer)
+ (gnus-kill-buffer gnus-backlog-buffer))
+ (setq gnus-backlog-hashtb nil
+ gnus-backlog-articles nil))
+
+(defun gnus-backlog-enter-article (group number buffer)
+ (when (and (numberp number)
+ (not (gnus-virtual-group-p group)))
+ (gnus-backlog-setup)
+ (let ((ident (intern (concat group ":" (int-to-string number))
+ gnus-backlog-hashtb))
+ b)
+ (if (memq ident gnus-backlog-articles)
+ () ; It's already kept.
+ ;; Remove the oldest article, if necessary.
+ (and (numberp gnus-keep-backlog)
+ (>= (length gnus-backlog-articles) gnus-keep-backlog)
+ (gnus-backlog-remove-oldest-article))
+ (push ident gnus-backlog-articles)
+ ;; Insert the new article.
+ (with-current-buffer (gnus-backlog-buffer)
+ (let (buffer-read-only)
+ (goto-char (point-max))
+ (unless (bolp)
+ (insert "\n"))
+ (setq b (point))
+ (insert-buffer-substring buffer)
+ ;; Tag the beginning of the article with the ident.
+ (if (> (point-max) b)
+ (gnus-put-text-property b (1+ b) 'gnus-backlog ident)
+ (gnus-error 3 "Article %d is blank" number))))))))
+
+(defun gnus-backlog-remove-oldest-article ()
+ (with-current-buffer (gnus-backlog-buffer)
+ (goto-char (point-min))
+ (if (zerop (buffer-size))
+ () ; The buffer is empty.
+ (let ((ident (get-text-property (point) 'gnus-backlog))
+ buffer-read-only)
+ ;; Remove the ident from the list of articles.
+ (when ident
+ (setq gnus-backlog-articles (delq ident gnus-backlog-articles)))
+ ;; Delete the article itself.
+ (delete-region
+ (point) (next-single-property-change
+ (1+ (point)) 'gnus-backlog nil (point-max)))))))
+
+(defun gnus-backlog-remove-article (group number)
+ "Remove article NUMBER in GROUP from the backlog."
+ (when (numberp number)
+ (gnus-backlog-setup)
+ (let ((ident (intern (concat group ":" (int-to-string number))
+ gnus-backlog-hashtb))
+ beg end)
+ (when (memq ident gnus-backlog-articles)
+ ;; It was in the backlog.
+ (with-current-buffer (gnus-backlog-buffer)
+ (let (buffer-read-only)
+ (when (setq beg (text-property-any
+ (point-min) (point-max) 'gnus-backlog
+ ident))
+ ;; Find the end (i. e., the beginning of the next article).
+ (setq end
+ (next-single-property-change
+ (1+ beg) 'gnus-backlog (current-buffer) (point-max)))
+ (delete-region beg end)
+ ;; Return success.
+ t))
+ (setq gnus-backlog-articles (delq ident gnus-backlog-articles)))))))
+
+(defun gnus-backlog-request-article (group number &optional buffer)
+ (when (and (numberp number)
+ (not (gnus-virtual-group-p group)))
+ (gnus-backlog-setup)
+ (let ((ident (intern (concat group ":" (int-to-string number))
+ gnus-backlog-hashtb))
+ beg end)
+ (when (memq ident gnus-backlog-articles)
+ ;; It was in the backlog.
+ (with-current-buffer (gnus-backlog-buffer)
+ (if (not (setq beg (text-property-any
+ (point-min) (point-max) 'gnus-backlog
+ ident)))
+ ;; It wasn't in the backlog after all.
+ (ignore
+ (setq gnus-backlog-articles (delq ident gnus-backlog-articles)))
+ ;; Find the end (i. e., the beginning of the next article).
+ (setq end
+ (next-single-property-change
+ (1+ beg) 'gnus-backlog (current-buffer) (point-max)))))
+ (with-current-buffer (or (current-buffer) buffer)
+ (let ((buffer-read-only nil))
+ (erase-buffer)
+ (insert-buffer-substring gnus-backlog-buffer beg end)))
+ t))))
+
+(provide 'gnus-bcklg)
+
+;;; gnus-bcklg.el ends here
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