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;;; nnagent.el --- offline backend for Gnus -*- lexical-binding: t; -*-
;; Copyright (C) 1997-2021 Free Software Foundation, Inc.
;; Author: Lars Magne Ingebrigtsen <larsi@gnus.org>
;; Keywords: news, mail
;; 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 <https://www.gnu.org/licenses/>.
;;; Commentary:
;;; Code:
(require 'nnheader)
(require 'nnoo)
(require 'gnus-agent)
(require 'nnml)
(nnoo-declare nnagent
nnml)
(defconst nnagent-version "nnagent 1.0")
(defvoo nnagent-directory nil
"Internal variable."
nnml-directory)
(defvoo nnagent-active-file nil
"Internal variable."
nnml-active-file)
(defvoo nnagent-newsgroups-file nil
"Internal variable."
nnml-newsgroups-file)
(defvoo nnagent-get-new-mail nil
"Internal variable."
nnml-get-new-mail)
;;; Interface functions.
(nnoo-define-basics nnagent)
(defun nnagent-server (server)
(and server (format "%s+%s" (car gnus-command-method) server)))
(deffoo nnagent-open-server (server &optional defs)
(setq defs
`((nnagent-directory ,(gnus-agent-directory))
(nnagent-active-file ,(gnus-agent-lib-file "active"))
(nnagent-newsgroups-file ,(gnus-agent-lib-file "newsgroups"))
(nnagent-get-new-mail nil)))
(nnoo-change-server 'nnagent
(nnagent-server server)
defs)
(let ((dir (gnus-agent-directory))
err)
(cond
((not (condition-case arg
(file-exists-p dir)
(ftp-error (setq err (format "%s" arg)))))
(nnagent-close-server)
(nnheader-report
'nnagent (or err
(format "No such file or directory: %s" dir))))
((not (file-directory-p (file-truename dir)))
(nnagent-close-server)
(nnheader-report 'nnagent "Not a directory: %s" dir))
(t
(nnheader-report 'nnagent "Opened server %s using directory %s"
server dir)
t))))
(deffoo nnagent-retrieve-groups (_groups &optional _server)
(save-excursion
(cond
((file-exists-p (gnus-agent-lib-file "groups"))
(nnmail-find-file (gnus-agent-lib-file "groups"))
'groups)
((file-exists-p (gnus-agent-lib-file "active"))
(nnmail-find-file (gnus-agent-lib-file "active"))
'active)
(t nil))))
(defun nnagent-request-type (group article)
(unless (stringp article)
(let ((gnus-agent nil))
(if (not (gnus-check-backend-function
'request-type (car gnus-command-method)))
'unknown
(funcall (gnus-get-function gnus-command-method 'request-type)
(gnus-group-real-name group) article)))))
(deffoo nnagent-request-newgroups (_date _server)
nil)
(deffoo nnagent-request-update-info (_group _info &optional _server)
nil)
(deffoo nnagent-request-post (&optional _server)
(gnus-agent-insert-meta-information 'news gnus-command-method)
(gnus-request-accept-article "nndraft:queue" nil t t))
(deffoo nnagent-request-set-mark (group action server)
(insert "(gnus-agent-synchronize-group-flags \""
group
"\" '")
(gnus-pp action)
(insert " \""
(gnus-method-to-server gnus-command-method)
"\"")
(insert ")\n")
(let ((coding-system-for-write nnheader-file-coding-system))
(write-region (point-min) (point-max) (gnus-agent-lib-file "flags")
t 'silent))
;; Also set the marks for the original back end that keeps marks in
;; the local system.
(let ((gnus-agent nil))
(when (and (memq (car gnus-command-method) '(nntp))
(gnus-check-backend-function 'request-set-mark
(car gnus-command-method)))
(funcall (gnus-get-function gnus-command-method 'request-set-mark)
group action server)))
nil)
(deffoo nnagent-retrieve-headers (articles &optional group _server fetch-old)
(let ((file (gnus-agent-article-name ".overview" group))
arts n first)
(save-excursion
(gnus-agent-load-alist group)
(setq arts (gnus-sorted-difference
articles (mapcar #'car gnus-agent-article-alist)))
;; Assume that articles with smaller numbers than the first one
;; Agent knows are gone.
(setq first (caar gnus-agent-article-alist))
(when first
(while (and arts (< (car arts) first))
(pop arts)))
(set-buffer nntp-server-buffer)
(erase-buffer)
(let ((file-name-coding-system nnmail-pathname-coding-system))
(nnheader-insert-nov-file file (car articles)))
(goto-char (point-min))
(gnus-parse-without-error
(while (and arts (not (eobp)))
(setq n (read (current-buffer)))
(when (> n (car arts))
(beginning-of-line))
(while (and arts (> n (car arts)))
(insert (format
"%d\t[Undownloaded article %d]\tGnus Agent\t\t\t\n"
(car arts) (car arts)))
(pop arts))
(when (and arts (= n (car arts)))
(pop arts))
(forward-line 1)))
(while arts
(insert (format
"%d\t[Undownloaded article %d]\tGnus Agent\t\t\t\n"
(car arts) (car arts)))
(pop arts))
(if (and fetch-old
(not (numberp fetch-old)))
t ; Don't remove anything.
(nnheader-nov-delete-outside-range
(if fetch-old (max 1 (- (car articles) fetch-old))
(car articles))
(car (last articles)))
t)
'nov)))
(deffoo nnagent-request-expire-articles (articles _group &optional _server _force)
articles)
(deffoo nnagent-request-group (group &optional server dont-check info)
(nnoo-parent-function 'nnagent 'nnml-request-group
(list group (nnagent-server server) dont-check info)))
(deffoo nnagent-close-group (group &optional server)
(nnoo-parent-function 'nnagent 'nnml-close-group
(list group (nnagent-server server))))
(deffoo nnagent-request-accept-article (group &optional server last)
(nnoo-parent-function 'nnagent 'nnml-request-accept-article
(list group (nnagent-server server) last)))
(deffoo nnagent-request-article (id &optional group server buffer)
(nnoo-parent-function 'nnagent 'nnml-request-article
(list id group (nnagent-server server) buffer)))
(deffoo nnagent-request-create-group (group &optional server args)
(nnoo-parent-function 'nnagent 'nnml-request-create-group
(list group (nnagent-server server) args)))
(deffoo nnagent-request-delete-group (group &optional force server)
(nnoo-parent-function 'nnagent 'nnml-request-delete-group
(list group force (nnagent-server server))))
(deffoo nnagent-request-list (&optional server)
(nnoo-parent-function 'nnagent 'nnml-request-list
(list (nnagent-server server))))
(deffoo nnagent-request-list-newsgroups (&optional server)
(nnoo-parent-function 'nnagent 'nnml-request-list-newsgroups
(list (nnagent-server server))))
(deffoo nnagent-request-move-article
(article group server accept-form &optional last move-is-internal)
(nnoo-parent-function 'nnagent 'nnml-request-move-article
(list article group (nnagent-server server)
accept-form last move-is-internal)))
(deffoo nnagent-request-rename-group (group new-name &optional server)
(nnoo-parent-function 'nnagent 'nnml-request-rename-group
(list group new-name (nnagent-server server))))
(deffoo nnagent-request-scan (&optional group server)
(nnoo-parent-function 'nnagent 'nnml-request-scan
(list group (nnagent-server server))))
(deffoo nnagent-set-status (article name value &optional group server)
(nnoo-parent-function 'nnagent 'nnml-set-status
(list article name value group (nnagent-server server))))
(deffoo nnagent-server-opened (&optional server)
(nnoo-parent-function 'nnagent 'nnml-server-opened
(list (nnagent-server server))))
(deffoo nnagent-status-message (&optional server)
(nnoo-parent-function 'nnagent 'nnml-status-message
(list (nnagent-server server))))
(deffoo nnagent-request-regenerate (server)
(nnoo-parent-function 'nnagent 'nnml-request-regenerate
(list (nnagent-server server))))
(deffoo nnagent-retrieve-group-data-early (_server _infos)
nil)
;; Use nnml functions for just about everything.
(nnoo-import nnagent
(nnml))
;;; Internal functions.
(provide 'nnagent)
;;; nnagent.el ends here
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