+(defun elmo-nntp-parse-newsgroups (string &optional subscribe-only)
+ (let ((nglist (elmo-parse string "[ \t\f\r\n,]*\\([^ \t\f\r\n,]+\\)"))
+ ngs)
+ (if (not subscribe-only)
+ nglist
+ (dolist (ng nglist)
+ (if (intern-soft ng elmo-newsgroups-hashtb)
+ (setq ngs (cons ng ngs))))
+ ngs)))
+
+;;; Crosspost processing.
+
+;; 1. setup crosspost alist.
+;; 1.1. When message is fetched and is crossposted message,
+;; it is remembered in `temp-crosses' slot.
+;; temp-crosses slot is a list of cons cell:
+;; (NUMBER . (MESSAGE-ID (LIST-OF-NEWSGROUPS) 'ng))
+;; 1.2. In elmo-folder-close, `temp-crosses' slot is cleared,
+;; 1.3. In elmo-folder-flag-as-read, move crosspost entry
+;; from `temp-crosses' slot to `elmo-crosspost-message-alist'.
+
+;; 2. process crosspost alist.
+;; 2.1. At elmo-folder-process-crosspost, setup `reads' slot from
+;; `elmo-crosspost-message-alist'.
+;; 2.2. remove crosspost entry for current newsgroup from
+;; `elmo-crosspost-message-alist'.
+;; 2.3. elmo-folder-list-unreads return unread message list according to
+;; `reads' slot.
+;; (There's a problem that if `elmo-folder-list-unreads'
+;; never executed, crosspost information is thrown away.)
+;; 2.4. In elmo-folder-close, `read' slot is cleared,
+
+(defun elmo-nntp-setup-crosspost-buffer (folder number)
+;; 1.1. When message is fetched and is crossposted message,
+;; it is remembered in `temp-crosses' slot.
+;; temp-crosses slot is a list of cons cell:
+;; (NUMBER . (MESSAGE-ID (LIST-OF-NEWSGROUPS) 'ng))
+ (let (newsgroups crosspost-newsgroups message-id)
+ (save-restriction
+ (std11-narrow-to-header)
+ (setq newsgroups (std11-fetch-field "newsgroups")
+ message-id (std11-msg-id-string
+ (car (std11-parse-msg-id-string
+ (std11-fetch-field "message-id"))))))
+ (when newsgroups
+ (when (setq crosspost-newsgroups
+ (delete
+ (elmo-nntp-folder-group-internal folder)
+ (elmo-nntp-parse-newsgroups newsgroups t)))
+ (unless (assq number
+ (elmo-nntp-folder-temp-crosses-internal folder))
+ (elmo-nntp-folder-set-temp-crosses-internal
+ folder
+ (cons (cons number (list message-id crosspost-newsgroups 'ng))
+ (elmo-nntp-folder-temp-crosses-internal folder))))))))
+
+(luna-define-method elmo-folder-close-internal ((folder elmo-nntp-folder))
+;; 1.2. In elmo-folder-close, `temp-crosses' slot is cleared,
+ (elmo-nntp-folder-set-temp-crosses-internal folder nil)
+ (elmo-nntp-folder-set-reads-internal folder nil)
+ )
+
+(defun elmo-nntp-folder-update-crosspost-message-alist (folder numbers)
+;; 1.3. In elmo-folder-flag-as-read, move crosspost entry
+;; from `temp-crosses' slot to `elmo-crosspost-message-alist'.
+ (let (elem)
+ (dolist (number numbers)
+ (when (setq elem (assq number
+ (elmo-nntp-folder-temp-crosses-internal folder)))
+ (unless (assoc (cdr (cdr elem)) elmo-crosspost-message-alist)
+ (setq elmo-crosspost-message-alist
+ (cons (cdr elem) elmo-crosspost-message-alist)))
+ (elmo-nntp-folder-set-temp-crosses-internal
+ folder
+ (delq elem (elmo-nntp-folder-temp-crosses-internal folder)))))))
+
+(luna-define-method elmo-folder-set-flag :before ((folder elmo-nntp-folder)
+ numbers
+ flag
+ &optional is-local)
+ (when (eq flag 'read)
+ (elmo-nntp-folder-update-crosspost-message-alist folder numbers)))
+
+(luna-define-method elmo-folder-unset-flag :before ((folder elmo-nntp-folder)
+ numbers
+ flag
+ &optional is-local)
+ (when (eq flag 'unread)
+ (elmo-nntp-folder-update-crosspost-message-alist folder numbers)))
+
+(defsubst elmo-nntp-folder-process-crosspost (folder)
+;; 2.1. At elmo-folder-process-crosspost, setup `reads' slot from
+;; `elmo-crosspost-message-alist'.
+;; 2.2. remove crosspost entry for current newsgroup from
+;; `elmo-crosspost-message-alist'.
+ (let (cross-deletes reads entity ngs)
+ (dolist (cross elmo-crosspost-message-alist)
+ (when (setq entity (elmo-message-entity folder (nth 0 cross)))
+ (setq reads (cons (elmo-message-entity-number entity) reads)))
+ (when entity
+ (if (setq ngs (delete (elmo-nntp-folder-group-internal folder)
+ (nth 1 cross)))
+ (setcar (cdr cross) ngs)
+ (setq cross-deletes (cons cross cross-deletes)))
+ (setq elmo-crosspost-message-alist-modified t)))
+ (dolist (dele cross-deletes)
+ (setq elmo-crosspost-message-alist (delq
+ dele
+ elmo-crosspost-message-alist)))
+ (elmo-nntp-folder-set-reads-internal folder reads)))
+
+(luna-define-method elmo-folder-process-crosspost ((folder elmo-nntp-folder))
+ (elmo-nntp-folder-process-crosspost folder))
+
+(luna-define-method elmo-folder-list-flagged :around ((folder elmo-nntp-folder)
+ flag &optional in-msgdb)
+ ;; 2.3. elmo-folder-list-unreads return unread message list according to
+ ;; `reads' slot.
+ (let ((msgs (luna-call-next-method)))
+ (if in-msgdb
+ msgs
+ (case flag
+ (unread
+ (elmo-living-messages msgs (elmo-nntp-folder-reads-internal folder)))
+ ;; Should consider read, digest and any flag?
+ (otherwise
+ msgs)))))
+
+(require 'product)
+(product-provide (provide 'elmo-nntp) (require 'elmo-version))