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emacs/lisp/gnus/nnkiboze.el
Glenn Morris ae940284fa Add 2009 to copyright years.
2009-01-05 03:18:22 +00:00

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;;; nnkiboze.el --- select virtual news access for Gnus
;; Copyright (C) 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004,
;; 2005, 2006, 2007, 2008, 2009 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:
;; The other access methods (nntp, nnspool, etc) are general news
;; access methods. This module relies on Gnus and can't be used
;; separately.
;;; Code:
(require 'nntp)
(require 'nnheader)
(require 'gnus)
(require 'gnus-score)
(require 'nnoo)
(require 'mm-util)
(eval-when-compile (require 'cl))
(nnoo-declare nnkiboze)
(defvoo nnkiboze-directory (nnheader-concat gnus-directory "kiboze/")
"nnkiboze will put its files in this directory.")
(defvoo nnkiboze-level 9
"The maximum level to be searched for articles.")
(defvoo nnkiboze-remove-read-articles t
"If non-nil, nnkiboze will remove read articles from the kiboze group.")
(defvoo nnkiboze-ephemeral nil
"If non-nil, don't store any data anywhere.")
(defvoo nnkiboze-scores nil
"Score rules for generating the nnkiboze group.")
(defvoo nnkiboze-regexp nil
"Regexp for matching component groups.")
(defvoo nnkiboze-file-coding-system mm-text-coding-system
"Coding system for nnkiboze files.")
(defconst nnkiboze-version "nnkiboze 1.0")
(defvoo nnkiboze-current-group nil)
(defvoo nnkiboze-status-string "")
(defvoo nnkiboze-headers nil)
;;; Interface functions.
(nnoo-define-basics nnkiboze)
(deffoo nnkiboze-retrieve-headers (articles &optional group server fetch-old)
(nnkiboze-possibly-change-group group)
(unless gnus-nov-is-evil
(if (stringp (car articles))
'headers
(let ((nov (nnkiboze-nov-file-name)))
(when (file-exists-p nov)
(save-excursion
(set-buffer nntp-server-buffer)
(erase-buffer)
(let ((nnheader-file-coding-system nnkiboze-file-coding-system))
(nnheader-insert-file-contents nov))
(nnheader-nov-delete-outside-range
(car articles) (car (last articles)))
'nov))))))
(deffoo nnkiboze-request-article (article &optional newsgroup server buffer)
(nnkiboze-possibly-change-group newsgroup)
(if (not (numberp article))
;; This is a real kludge. It might not work at times, but it
;; does no harm I think. The only alternative is to offer no
;; article fetching by message-id at all.
(nntp-request-article article newsgroup gnus-nntp-server buffer)
(let* ((header (gnus-summary-article-header article))
(xref (mail-header-xref header))
num group)
(unless xref
(error "nnkiboze: No xref"))
(unless (string-match " \\([^ ]+\\):\\([0-9]+\\)" xref)
(error "nnkiboze: Malformed xref"))
(setq num (string-to-number (match-string 2 xref))
group (match-string 1 xref))
(or (with-current-buffer buffer
(or (and gnus-use-cache (gnus-cache-request-article num group))
(gnus-agent-request-article num group)))
(gnus-request-article num group buffer)))))
(deffoo nnkiboze-request-scan (&optional group server)
(nnkiboze-possibly-change-group group)
(nnkiboze-generate-group (concat "nnkiboze:" group)))
(deffoo nnkiboze-request-group (group &optional server dont-check)
"Make GROUP the current newsgroup."
(nnkiboze-possibly-change-group group)
(if dont-check
t
(let ((nov-file (nnkiboze-nov-file-name))
beg end total)
(save-excursion
(set-buffer nntp-server-buffer)
(erase-buffer)
(unless (file-exists-p nov-file)
(nnkiboze-request-scan group))
(if (not (file-exists-p nov-file))
(nnheader-report 'nnkiboze "Can't select group %s" group)
(let ((nnheader-file-coding-system nnkiboze-file-coding-system))
(nnheader-insert-file-contents nov-file))
(if (zerop (buffer-size))
(nnheader-insert "211 0 0 0 %s\n" group)
(goto-char (point-min))
(when (looking-at "[0-9]+")
(setq beg (read (current-buffer))))
(goto-char (point-max))
(when (re-search-backward "^[0-9]" nil t)
(setq end (read (current-buffer))))
(setq total (count-lines (point-min) (point-max)))
(nnheader-insert "211 %d %d %d %s\n" total beg end group)))))))
(deffoo nnkiboze-close-group (group &optional server)
(nnkiboze-possibly-change-group group)
;; Remove NOV lines of articles that are marked as read.
(when (and (file-exists-p (nnkiboze-nov-file-name))
nnkiboze-remove-read-articles)
(let ((coding-system-for-write nnkiboze-file-coding-system))
(with-temp-file (nnkiboze-nov-file-name)
(let ((cur (current-buffer))
(nnheader-file-coding-system nnkiboze-file-coding-system))
(nnheader-insert-file-contents (nnkiboze-nov-file-name))
(goto-char (point-min))
(while (not (eobp))
(if (not (gnus-article-read-p (read cur)))
(forward-line 1)
(gnus-delete-line))))))
(setq nnkiboze-current-group nil)))
(deffoo nnkiboze-open-server (server &optional defs)
(unless (assq 'nnkiboze-regexp defs)
(push `(nnkiboze-regexp ,server)
defs))
(nnoo-change-server 'nnkiboze server defs))
(deffoo nnkiboze-request-delete-group (group &optional force server)
(nnkiboze-possibly-change-group group)
(when force
(let ((files (nconc
(nnkiboze-score-file group)
(list (nnkiboze-nov-file-name)
(nnkiboze-nov-file-name ".newsrc")))))
(while files
(and (file-exists-p (car files))
(file-writable-p (car files))
(delete-file (car files)))
(setq files (cdr files)))))
(setq nnkiboze-current-group nil)
t)
(nnoo-define-skeleton nnkiboze)
;;; Internal functions.
(defun nnkiboze-possibly-change-group (group)
(setq nnkiboze-current-group group))
(defun nnkiboze-prefixed-name (group)
(gnus-group-prefixed-name group '(nnkiboze "")))
;;;###autoload
(defun nnkiboze-generate-groups ()
"\"Usage: emacs -batch -l nnkiboze -f nnkiboze-generate-groups\".
Finds out what articles are to be part of the nnkiboze groups."
(interactive)
(let ((mail-sources nil)
(gnus-use-dribble-file nil)
(gnus-read-active-file t)
(gnus-expert-user t))
(gnus))
(let* ((gnus-newsrc-alist (gnus-copy-sequence gnus-newsrc-alist))
(newsrc (cdr gnus-newsrc-alist))
gnus-newsrc-hashtb info)
(gnus-make-hashtable-from-newsrc-alist)
;; We have copied all the newsrc alist info over to local copies
;; so that we can mess all we want with these lists.
(while (setq info (pop newsrc))
(when (string-match "nnkiboze" (gnus-info-group info))
;; For each kiboze group, we call this function to generate
;; it.
(nnkiboze-generate-group (gnus-info-group info) t))))
(save-excursion
(set-buffer gnus-group-buffer)
(gnus-group-list-groups)))
(defun nnkiboze-score-file (group)
(list (expand-file-name
(concat (file-name-as-directory gnus-kill-files-directory)
(nnheader-translate-file-chars
(concat (nnkiboze-prefixed-name nnkiboze-current-group)
"." gnus-score-file-suffix))))))
(defun nnkiboze-generate-group (group &optional inhibit-list-groups)
(let* ((info (gnus-get-info group))
(newsrc-file (concat nnkiboze-directory
(nnheader-translate-file-chars
(concat group ".newsrc"))))
(nov-file (concat nnkiboze-directory
(nnheader-translate-file-chars
(concat group ".nov"))))
method nnkiboze-newsrc gname newsrc active
ginfo lowest glevel orig-info nov-buffer
;; Bind various things to nil to make group entry faster.
(gnus-expert-user t)
(gnus-large-newsgroup nil)
(gnus-score-find-score-files-function 'nnkiboze-score-file)
;; Use only nnkiboze-score-file!
(gnus-score-use-all-scores nil)
(gnus-use-scoring t)
(gnus-verbose (min gnus-verbose 3))
gnus-select-group-hook gnus-summary-prepare-hook
gnus-thread-sort-functions gnus-show-threads
gnus-visual gnus-suppress-duplicates num-unread)
(unless info
(error "No such group: %s" group))
;; Load the kiboze newsrc file for this group.
(when (file-exists-p newsrc-file)
(load newsrc-file))
(let ((coding-system-for-write nnkiboze-file-coding-system))
(gnus-make-directory (file-name-directory nov-file))
(with-temp-file nov-file
(mm-disable-multibyte)
(when (file-exists-p nov-file)
(insert-file-contents nov-file))
(setq nov-buffer (current-buffer))
;; Go through the active hashtb and add new all groups that match the
;; kiboze regexp.
(mapatoms
(lambda (group)
(and (string-match nnkiboze-regexp
(setq gname (symbol-name group))) ; Match
(not (assoc gname nnkiboze-newsrc)) ; It isn't registered
(numberp (car (symbol-value group))) ; It is active
(or (> nnkiboze-level 7)
(and (setq glevel
(gnus-info-level (gnus-get-info gname)))
(>= nnkiboze-level glevel)))
(not (string-match "^nnkiboze:" gname)) ; Exclude kibozes
(push (cons gname (1- (car (symbol-value group))))
nnkiboze-newsrc)))
gnus-active-hashtb)
;; `newsrc' is set to the list of groups that possibly are
;; component groups to this kiboze group. This list has elements
;; on the form `(GROUP . NUMBER)', where NUMBER is the highest
;; number that has been kibozed in GROUP in this kiboze group.
(setq newsrc nnkiboze-newsrc)
(while newsrc
(if (not (setq active (gnus-active (caar newsrc))))
;; This group isn't active after all, so we remove it from
;; the list of component groups.
(setq nnkiboze-newsrc (delq (car newsrc) nnkiboze-newsrc))
(setq lowest (cdar newsrc))
;; Ok, we have a valid component group, so we jump to it.
(switch-to-buffer gnus-group-buffer)
(gnus-group-jump-to-group (caar newsrc))
(gnus-message 3 "nnkiboze: Checking %s..." (caar newsrc))
(setq ginfo (gnus-get-info (gnus-group-group-name))
orig-info (gnus-copy-sequence ginfo)
num-unread (gnus-group-unread (caar newsrc)))
(unwind-protect
(progn
;; We set all list of article marks to nil. Since we operate
;; on copies of the real lists, we can destroy anything we
;; want here.
(when (nth 3 ginfo)
(setcar (nthcdr 3 ginfo) nil))
;; We set the list of read articles to be what we expect for
;; this kiboze group -- either nil or `(1 . LOWEST)'.
(when ginfo
(setcar (nthcdr 2 ginfo)
(and (not (= lowest 1)) (cons 1 lowest))))
(when (and (or (not ginfo)
(> (length (gnus-list-of-unread-articles
(car ginfo)))
0))
(progn
(ignore-errors
(gnus-group-select-group nil))
(eq major-mode 'gnus-summary-mode)))
;; We are now in the group where we want to be.
(setq method (gnus-find-method-for-group
gnus-newsgroup-name))
(when (eq method gnus-select-method)
(setq method nil))
;; We go through the list of scored articles.
(while gnus-newsgroup-scored
(when (> (caar gnus-newsgroup-scored) lowest)
;; If it has a good score, then we enter this article
;; into the kiboze group.
(nnkiboze-enter-nov
nov-buffer
(gnus-summary-article-header
(caar gnus-newsgroup-scored))
gnus-newsgroup-name))
(setq gnus-newsgroup-scored (cdr gnus-newsgroup-scored)))
;; That's it. We exit this group.
(when (eq major-mode 'gnus-summary-mode)
(kill-buffer (current-buffer)))))
;; Restore the proper info.
(when ginfo
(setcdr ginfo (cdr orig-info)))
(setcar (gnus-group-entry (caar newsrc)) num-unread)))
(setcdr (car newsrc) (cdr active))
(gnus-message 3 "nnkiboze: Checking %s...done" (caar newsrc))
(setq newsrc (cdr newsrc)))))
;; We save the kiboze newsrc for this group.
(gnus-make-directory (file-name-directory newsrc-file))
(with-temp-file newsrc-file
(mm-disable-multibyte)
(insert "(setq nnkiboze-newsrc '")
(gnus-prin1 nnkiboze-newsrc)
(insert ")\n"))
(unless inhibit-list-groups
(save-excursion
(set-buffer gnus-group-buffer)
(gnus-group-list-groups)))
t))
(defun nnkiboze-enter-nov (buffer header group)
(save-excursion
(set-buffer buffer)
(goto-char (point-max))
(let ((prefix (gnus-group-real-prefix group))
(oheader (copy-sequence header))
article)
(if (zerop (forward-line -1))
(progn
(setq article (1+ (read (current-buffer))))
(forward-line 1))
(setq article 1))
(mail-header-set-number oheader article)
(with-temp-buffer
(insert (or (mail-header-xref oheader) ""))
(goto-char (point-min))
(if (re-search-forward " [^ ]+:[0-9]+" nil t)
(goto-char (match-beginning 0))
(or (eobp) (forward-char 1)))
;; The first Xref has to be the group this article
;; really came for - this is the article nnkiboze
;; will request when it is asked for the article.
(insert " " group ":"
(int-to-string (mail-header-number header)) " ")
(while (re-search-forward " [^ ]+:[0-9]+" nil t)
(goto-char (1+ (match-beginning 0)))
(insert prefix))
(mail-header-set-xref oheader (buffer-string)))
(nnheader-insert-nov oheader))))
(defun nnkiboze-nov-file-name (&optional suffix)
(concat (file-name-as-directory nnkiboze-directory)
(nnheader-translate-file-chars
(concat (nnkiboze-prefixed-name nnkiboze-current-group)
(or suffix ".nov")))))
(provide 'nnkiboze)
;; arch-tag: 66068271-bdc9-4801-bcde-779702e73a05
;;; nnkiboze.el ends here
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