* wl-summary.el (wl-summary-input-range): New range `cache-status'.
[elisp/wanderlust.git] / wl / wl-summary.el
index ce735a2..20caf04 100644 (file)
@@ -1,4 +1,4 @@
-;;; wl-summary.el -- Summary mode for Wanderlust.
+;;; wl-summary.el --- Summary mode for Wanderlust.
 
 ;; Copyright (C) 1998,1999,2000 Yuuichi Teranishi <teranisi@gohome.org>
 ;; Copyright (C) 1998,1999,2000 Masahiro MURATA <muse@ba2.so-net.ne.jp>
@@ -35,7 +35,7 @@
 ;;; Code:
 ;;
 
-(require 'elmo2)
+(require 'elmo)
 (require 'elmo-multi)
 (require 'wl-message)
 (require 'wl-vars)
 (defvar wl-summary-mode-map nil)
 (defvar wl-current-summary-buffer nil)
 
-(defvar wl-summary-buffer-msgdb       nil)
-(defvar wl-summary-buffer-folder-name nil)
+(defvar wl-summary-buffer-elmo-folder nil)
+
+(defmacro wl-summary-buffer-folder-name ()
+  (` (and wl-summary-buffer-elmo-folder
+         (elmo-folder-name-internal wl-summary-buffer-elmo-folder))))
+
+(defmacro wl-summary-buffer-msgdb ()
+  (` (and wl-summary-buffer-elmo-folder
+         (elmo-folder-msgdb wl-summary-buffer-elmo-folder))))
+
 (defvar wl-summary-buffer-folder-indicator nil)
 (defvar wl-summary-buffer-disp-msg    nil)
 (defvar wl-summary-buffer-disp-folder nil)
@@ -80,7 +88,6 @@
 (defvar wl-summary-buffer-mime-charset  nil)
 (defvar wl-summary-buffer-weekday-name-lang  nil)
 (defvar wl-summary-buffer-thread-indent-set-alist  nil)
-(defvar wl-summary-buffer-message-redisplay-func nil)
 (defvar wl-summary-buffer-view 'thread)
 (defvar wl-summary-buffer-message-modified nil)
 (defvar wl-summary-buffer-mark-modified nil)
 (defvar wl-summary-buffer-prev-refile-destination nil)
 (defvar wl-summary-buffer-prev-copy-destination nil)
 (defvar wl-summary-buffer-saved-message nil)
-(defvar wl-summary-buffer-prev-folder-func nil)
-(defvar wl-summary-buffer-next-folder-func nil)
-(defvar wl-summary-buffer-exit-func nil)
+(defvar wl-summary-buffer-prev-folder-function nil)
+(defvar wl-summary-buffer-next-folder-function nil)
+(defvar wl-summary-buffer-exit-function nil)
+(defvar wl-summary-buffer-next-message-function nil)
+(defvar wl-summary-buffer-number-list nil)
+(defvar wl-summary-buffer-msgdb nil)
+(defvar wl-summary-buffer-folder-name nil)
+
 (defvar wl-thread-indent-level-internal nil)
 (defvar wl-thread-have-younger-brother-str-internal nil)
 (defvar wl-thread-youngest-child-str-internal nil)
 (defvar wl-summary-alike-hashtb nil)
 (defvar wl-summary-search-buf-name " *wl-search-subject*")
 (defvar wl-summary-delayed-update nil)
+(defvar wl-summary-search-buf-folder-name nil)
 
-(defvar wl-summary-get-petname-func 'wl-address-get-petname-1)
+(defvar wl-summary-get-petname-function 'wl-address-get-petname-1)
 
-(defvar wl-summary-message-regexp "^ *\\([0-9]+\\)")
+(defvar wl-summary-message-regexp "^ *\\(-?[0-9]+\\)")
 
 (defvar wl-summary-shell-command-last "")
 
 (defvar wl-ps-preprint-hook nil)
 (defvar wl-ps-print-hook nil)
 
-(make-variable-buffer-local 'wl-summary-buffer-msgdb)
+(make-variable-buffer-local 'wl-summary-buffer-elmo-folder)
+(make-variable-buffer-local 'wl-summary-search-buf-folder-name)
 (make-variable-buffer-local 'wl-summary-buffer-disp-msg)
 (make-variable-buffer-local 'wl-summary-buffer-disp-folder)
 (make-variable-buffer-local 'wl-summary-buffer-refile-list)
 (make-variable-buffer-local 'wl-summary-buffer-copy-list)
 (make-variable-buffer-local 'wl-summary-buffer-target-mark-list)
 (make-variable-buffer-local 'wl-summary-buffer-delete-list)
-(make-variable-buffer-local 'wl-summary-buffer-folder-name)
 (make-variable-buffer-local 'wl-summary-buffer-folder-indicator)
 (make-variable-buffer-local 'wl-summary-buffer-last-displayed-msg)
 (make-variable-buffer-local 'wl-summary-buffer-unread-status)
 (make-variable-buffer-local 'wl-summary-buffer-mime-charset)
 (make-variable-buffer-local 'wl-summary-buffer-weekday-name-lang)
 (make-variable-buffer-local 'wl-summary-buffer-thread-indent-set)
-(make-variable-buffer-local 'wl-summary-buffer-message-redisplay-func)
 (make-variable-buffer-local 'wl-summary-buffer-view)
 (make-variable-buffer-local 'wl-summary-buffer-message-modified)
 (make-variable-buffer-local 'wl-summary-buffer-mark-modified)
 (make-variable-buffer-local 'wl-thread-vertical-str-internal)
 (make-variable-buffer-local 'wl-thread-horizontal-str-internal)
 (make-variable-buffer-local 'wl-thread-space-str-internal)
-(make-variable-buffer-local 'wl-summary-buffer-prev-folder-func)
-(make-variable-buffer-local 'wl-summary-buffer-next-folder-func)
-(make-variable-buffer-local 'wl-summary-buffer-exit-func)
+(make-variable-buffer-local 'wl-summary-buffer-prev-folder-function)
+(make-variable-buffer-local 'wl-summary-buffer-next-folder-function)
+(make-variable-buffer-local 'wl-summary-buffer-exit-function)
+(make-variable-buffer-local 'wl-summary-buffer-next-message-function)
+(make-variable-buffer-local 'wl-summary-buffer-number-list)
+(make-variable-buffer-local 'wl-summary-buffer-msgdb)
+(make-variable-buffer-local 'wl-summary-buffer-folder-name)
 
 ;; internal functions (dummy)
 (unless (fboundp 'wl-summary-append-message-func-internal)
   (defun wl-summary-subject-filter-func-internal (subject)
     subject))
 
-(defmacro wl-summary-sticky-buffer-name (folder)
-  (` (concat wl-summary-buffer-name ":" (, folder))))
+(defmacro wl-summary-sticky-buffer-name (name)
+  (` (concat wl-summary-buffer-name ":" (, name))))
 
 (defun wl-summary-default-subject (subject-string)
   (if (string-match "^[ \t]*\\[[^:]+[,: ][0-9]+\\][ \t]*" subject-string)
        (and (eq major-mode 'wl-summary-mode)
             (stringp wl-summary-showto-folder-regexp)
             (string-match wl-summary-showto-folder-regexp
-                          wl-summary-buffer-folder-name)
+                          (wl-summary-buffer-folder-name))
             (wl-address-user-mail-address-p from)
             (cond
              ((and (setq tos (elmo-msgdb-overview-entity-get-to entity))
                                 (eword-decode-string
                                  (if wl-use-petname
                                      (or
-                                      (funcall wl-summary-get-petname-func to)
+                                      (funcall wl-summary-get-petname-function to)
                                       (car
                                        (std11-extract-address-components to))
                                       to)
                         entity "newsgroups"))
               (setq retval (concat "Ng:" ng)))))
       (if wl-use-petname
-         (setq retval (or (funcall wl-summary-get-petname-func from)
+         (setq retval (or (funcall wl-summary-get-petname-function from)
                           (car (std11-extract-address-components from))
                           from))
        (setq retval from)))
 
 (defun wl-summary-simple-from (string)
   (if wl-use-petname
-      (or (funcall wl-summary-get-petname-func string)
+      (or (funcall wl-summary-get-petname-function string)
          (car (std11-extract-address-components string))
          string)
     string))
       (define-key wl-summary-mode-map [(shift button5)]
        'wl-summary-down)
       (define-key wl-summary-mode-map 'button2 'wl-summary-click))
-  (if wl-on-nemacs
-      (defun wl-summary-setup-mouse ())
-    (defun wl-summary-setup-mouse ()
-      (define-key wl-summary-mode-map [mouse-4] 'wl-summary-prev)
-      (define-key wl-summary-mode-map [mouse-5] 'wl-summary-next)
-      (define-key wl-summary-mode-map [S-mouse-4] 'wl-summary-up)
-      (define-key wl-summary-mode-map [S-mouse-5] 'wl-summary-down)
-      (define-key wl-summary-mode-map [mouse-2] 'wl-summary-click))))
+  (defun wl-summary-setup-mouse ()
+    (define-key wl-summary-mode-map [mouse-4] 'wl-summary-prev)
+    (define-key wl-summary-mode-map [mouse-5] 'wl-summary-next)
+    (define-key wl-summary-mode-map [S-mouse-4] 'wl-summary-up)
+    (define-key wl-summary-mode-map [S-mouse-5] 'wl-summary-down)
+    (define-key wl-summary-mode-map [mouse-2] 'wl-summary-click)))
 
 (if wl-summary-mode-map
     ()
   (define-key wl-summary-mode-map "<"    'wl-summary-display-top)
   (define-key wl-summary-mode-map ">"    'wl-summary-display-bottom)
   (define-key wl-summary-mode-map "\177" 'wl-summary-prev-page)
-  (unless wl-on-nemacs
-    (define-key wl-summary-mode-map [backspace] 'wl-summary-prev-page))
+  (define-key wl-summary-mode-map [backspace] 'wl-summary-prev-page)
   (define-key wl-summary-mode-map "\r"   'wl-summary-next-line-content)
   (define-key wl-summary-mode-map "\C-m" 'wl-summary-next-line-content)
   (define-key wl-summary-mode-map "/"    'wl-thread-open-close)
   (define-key wl-summary-mode-map "\e\r" 'wl-summary-prev-line-content)
   (define-key wl-summary-mode-map "g"    'wl-summary-goto-folder)
   (define-key wl-summary-mode-map "c"    'wl-summary-mark-as-read-all)
-  (define-key wl-summary-mode-map "D"    'wl-summary-drop-unsync)
+;  (define-key wl-summary-mode-map "D"    'wl-summary-drop-unsync)
 
   (define-key wl-summary-mode-map "a"    'wl-summary-reply)
   (define-key wl-summary-mode-map "A"    'wl-summary-reply-with-citation)
 ;;;(define-key wl-summary-mode-map "e"     'wl-draft-open-file)
   (define-key wl-summary-mode-map "e"     'wl-summary-save)
   (define-key wl-summary-mode-map "\C-c\C-o" 'wl-jump-to-draft-buffer)
+  (define-key wl-summary-mode-map "\C-c\C-a" 'wl-addrmgr)
   (define-key wl-summary-mode-map "H"    'wl-summary-redisplay-all-header)
   (define-key wl-summary-mode-map "M"    'wl-summary-redisplay-no-mime)
   (define-key wl-summary-mode-map "B"    'wl-summary-burst)
   (if wl-summary-buffer-disp-msg
       (wl-summary-redisplay)))
 
-(defun wl-summary-collect-unread (mark-alist &optional folder)
-  (let (mark ret-val)
-    (while mark-alist
-      (setq mark (cadr (car mark-alist)))
-      (and mark
-          (or (string= mark wl-summary-new-mark)
-              (string= mark wl-summary-unread-uncached-mark)
-              (string= mark wl-summary-unread-cached-mark))
-          (setq ret-val (cons (car (car mark-alist)) ret-val)))
-      (setq mark-alist (cdr mark-alist)))
-    ret-val))
-
-(defun wl-summary-count-unread (mark-alist &optional folder)
+(defun wl-summary-count-unread (mark-alist)
   (let ((new 0)
        (unread 0)
        mark)
     (if (eq major-mode 'wl-summary-mode)
        (setq wl-summary-buffer-new-count new
              wl-summary-buffer-unread-count unread))
-    (+ new unread)))
+    (cons new unread)))
+
+(defun wl-summary-message-string (&optional use-cache)
+  "Return full body string of current message.
+If optional USE-CACHE is non-nil, use cache if exists."
+  (let ((number (wl-summary-message-number))
+       (folder wl-summary-buffer-elmo-folder))
+    (if (null number)
+       (message "No message.")
+      (elmo-set-work-buf
+       (elmo-message-fetch folder
+                          number
+                          (elmo-make-fetch-strategy
+                           'entire
+                           use-cache ; use cache
+                           nil ; save cache (should `t'?)
+                           (and
+                            use-cache
+                            (elmo-file-cache-get-path
+                             (elmo-message-field folder number 'message-id))))
+                          nil
+                          (current-buffer)
+                          'unread)
+       (buffer-string)))))
 
 (defun wl-summary-reedit (&optional arg)
   "Re-edit current message.
@@ -568,7 +593,7 @@ If ARG is non-nil, Supersedes message"
   (interactive "P")
   (if arg
       (wl-summary-supersedes-message)
-    (if (string= wl-summary-buffer-folder-name wl-draft-folder)
+    (if (string= (wl-summary-buffer-folder-name) wl-draft-folder)
        (if (wl-summary-message-number)
            (unwind-protect
                (wl-draft-reedit (wl-summary-message-number))
@@ -576,14 +601,7 @@ If ARG is non-nil, Supersedes message"
                  (mail-position-on-field "Newsgroups")
                (mail-position-on-field "To"))
              (delete-other-windows)))
-      (save-excursion
-       (let ((mmelmo-force-fetch-entire-message t))
-         (if (null (wl-summary-message-number))
-             (message "No message.")
-           (wl-summary-set-message-buffer-or-redisplay)
-           (set-buffer (wl-message-get-original-buffer))
-           (wl-draft-edit-string (buffer-substring (point-min)
-                                                   (point-max)))))))))
+      (wl-draft-edit-string (wl-summary-message-string)))))
 
 (defun wl-summary-resend-bounced-mail ()
   "Re-mail the current message.
@@ -592,36 +610,36 @@ contains some mail you have written but has been bounced back to
 you."
   (interactive)
   (save-excursion
-    (let ((mmelmo-force-fetch-entire-message t))
-      (wl-summary-set-message-buffer-or-redisplay)
-      (set-buffer (wl-message-get-original-buffer))
-      (goto-char (point-min))
-      (let ((case-fold-search nil))
-       (cond
-        ((and
-          (re-search-forward
-           (concat "^\\($\\|[Cc]ontent-[Tt]ype:[ \t]+multipart/report\\)") nil t)
-          (not (bolp))
-          (re-search-forward "boundary=\"\\([^\"]+\\)\"" nil t))
-         (let ((boundary (buffer-substring (match-beginning 1) (match-end 1)))
-               start)
-           (cond
-            ((and (setq start (re-search-forward
-                          (concat "^--" boundary "\n"
-                                  "[Cc]ontent-[Tt]ype:[ \t]+"
-                                  "\\(message/rfc822\\|text/rfc822-headers\\)\n"
-                                  "\\(.+\n\\)*\n") nil t))
-                  (re-search-forward
-                        (concat "\n\\(--" boundary "\\)--\n") nil t))
-             (wl-draft-edit-string (buffer-substring start (match-beginning 1))))
-            (t
-             (message "Seems no message/rfc822 part.")))))
-        ((let ((case-fold-search t))
-           (re-search-forward wl-rejected-letter-start nil t))
-         (skip-chars-forward " \t\n")
-         (wl-draft-edit-string (buffer-substring (point) (point-max))))
-        (t
-         (message "Does not appear to be a rejected letter.")))))))
+    (wl-summary-set-message-buffer-or-redisplay)
+    (set-buffer (wl-message-get-original-buffer))
+    (goto-char (point-min))
+    (let ((case-fold-search nil))
+      (cond
+       ((and
+        (re-search-forward
+         (concat "^\\($\\|[Cc]ontent-[Tt]ype:[ \t]+multipart/\\(report\\|mixed\\)\\)") nil t)
+        (not (bolp))
+        (re-search-forward "boundary=\"\\([^\"]+\\)\"" nil t))
+       (let ((boundary (buffer-substring (match-beginning 1) (match-end 1)))
+             start)
+         (cond
+          ((and (setq start (re-search-forward
+                             (concat "^--" boundary "\n"
+                                     "\\([Cc]ontent-[Dd]escription:.*\n\\)?"
+                                     "[Cc]ontent-[Tt]ype:[ \t]+"
+                                     "\\(message/rfc822\\|text/rfc822-headers\\)\n"
+                                     "\\(.+\n\\)*\n") nil t))
+                (re-search-forward
+                 (concat "\n\\(--" boundary "\\)--\n") nil t))
+           (wl-draft-edit-string (buffer-substring start (match-beginning 1))))
+          (t
+           (message "Seems no message/rfc822 part.")))))
+       ((let ((case-fold-search t))
+         (re-search-forward wl-rejected-letter-start nil t))
+       (skip-chars-forward " \t\n")
+       (wl-draft-edit-string (buffer-substring (point) (point-max))))
+       (t
+       (message "Does not appear to be a rejected letter."))))))
 
 (defun wl-summary-resend-message (address)
   "Resend the current message to ADDRESS."
@@ -630,8 +648,7 @@ you."
       (message "No address specified.")
     (message "Resending message to %s..." address)
     (save-excursion
-      (let ((mmelmo-force-fetch-entire-message t))
-       (wl-summary-set-message-buffer-or-redisplay)
+      (let ((original (wl-summary-get-original-buffer)))
        ;; We first set up a normal mail buffer.
        (set-buffer (get-buffer-create " *wl-draft-resend*"))
        (buffer-disable-undo (current-buffer))
@@ -651,7 +668,7 @@ you."
        (delete-region (point) (point-max))
        (let ((beg  (point)))
          ;; Insert the message to be resent.
-         (insert-buffer-substring (wl-message-get-original-buffer))
+         (insert-buffer-substring original)
          (goto-char (point-min))
          (search-forward "\n\n")
          (forward-char -1)
@@ -673,54 +690,36 @@ you."
        (kill-buffer (current-buffer)))
       (message "Resending message to %s...done" address))))
 
-(defun wl-summary-msgdb-load-async (folder)
-  "Loading msgdb and selecting FOLDER is executed asynchronously in IMAP4."
-  (if (and (elmo-folder-plugged-p folder)
-          (eq (elmo-folder-get-type folder) 'imap4))
-      (let ((spec (elmo-folder-get-spec folder))
-           session mailbox
-           msgdb response tag)
-       (unwind-protect
-           (progn
-             (setq session (elmo-imap4-get-session spec)
-                   mailbox (elmo-imap4-spec-mailbox spec)
-                   tag (elmo-imap4-send-command session
-                                                (list "select "
-                                                      (elmo-imap4-mailbox
-                                                       mailbox))))
-             (setq msgdb (elmo-msgdb-load (elmo-string folder)))
-             (setq response (elmo-imap4-read-response session tag)))
-         (if response
-             (elmo-imap4-session-set-current-mailbox-internal session mailbox)
-           (and session
-                (elmo-imap4-session-set-current-mailbox-internal session nil))
-           (message "Select mailbox %s failed" mailbox)))
-       msgdb)
-    (elmo-msgdb-load (elmo-string folder))))
-
 (defun wl-summary-buffer-set-folder (folder)
-  (setq wl-summary-buffer-folder-name folder)
+  (if (stringp folder)
+      (setq folder (wl-folder-get-elmo-folder folder)))
+  (setq wl-summary-buffer-elmo-folder folder)
   (setq wl-summary-buffer-folder-indicator
        (if (memq 'modeline wl-use-folder-petname)
-           (wl-folder-get-petname folder)
-         folder))
-  (when (wl-summary-sticky-p)
-    (make-local-variable 'wl-message-buf-name)
-    (setq wl-message-buf-name (format "%s:%s" wl-message-buf-name folder)))
+           (wl-folder-get-petname (elmo-folder-name-internal folder))
+         (elmo-folder-name-internal folder)))
+  (make-local-variable 'wl-message-buffer)
   (setq wl-summary-buffer-mime-charset (or (wl-get-assoc-list-value
                                            wl-folder-mime-charset-alist
-                                           folder)
+                                           (elmo-folder-name-internal folder))
                                           wl-mime-charset))
   (setq wl-summary-buffer-weekday-name-lang
        (or (wl-get-assoc-list-value
             wl-folder-weekday-name-lang-alist
-            folder)
+            (elmo-folder-name-internal folder))
            wl-summary-weekday-name-lang))
   (setq wl-summary-buffer-thread-indent-set
        (wl-get-assoc-list-value
         wl-folder-thread-indent-set-alist
-        folder))
-  (setq wl-summary-buffer-persistent (wl-folder-persistent-p folder))
+        (elmo-folder-name-internal folder)))
+  (setq wl-summary-buffer-persistent
+       (wl-folder-persistent-p (elmo-folder-name-internal folder)))
+  (elmo-folder-set-persistent-internal folder wl-summary-buffer-persistent)
+  ;; process duplicates.
+  (elmo-folder-set-process-duplicates-internal
+   folder (cdr (elmo-string-matched-assoc
+               (elmo-folder-name-internal folder)
+               wl-folder-process-duplicates-alist)))
   (setq
    wl-thread-indent-level-internal
    (or (nth 0 wl-summary-buffer-thread-indent-set)
@@ -768,15 +767,13 @@ Entering Folder mode calls the value of `wl-summary-mode-hook'."
 ;;;(make-local-variable 'tab-width)
 ;;;(setq tab-width 1)
   (buffer-disable-undo (current-buffer))
-  (if wl-use-semi
-      (setq wl-summary-buffer-message-redisplay-func
-           'wl-mmelmo-message-redisplay)
-    (setq wl-summary-buffer-message-redisplay-func
-         'wl-normal-message-redisplay))
   (wl-mode-line-buffer-identification '("Wanderlust: "
                                        wl-summary-buffer-folder-indicator
                                        wl-summary-buffer-unread-status))
   (easy-menu-add wl-summary-mode-menu)
+  (when wl-summary-lazy-highlight
+    (make-local-variable 'window-scroll-functions)
+    (add-hook 'window-scroll-functions 'wl-highlight-summary-window))
   ;; This hook may contain the function `wl-setup-summary' for reasons
   ;; of system internal to accord facilities for the Emacs variants.
   (run-hooks 'wl-summary-mode-hook))
@@ -829,7 +826,7 @@ Entering Folder mode calls the value of `wl-summary-mode-hook'."
   "Rescan current folder without updating."
   (interactive)
   (let* ((cur-buf (current-buffer))
-        (msgdb wl-summary-buffer-msgdb)
+        (msgdb (wl-summary-buffer-msgdb))
         (overview (elmo-msgdb-get-overview msgdb))
         (number-alist (elmo-msgdb-get-number-alist msgdb))
         (mark-alist (elmo-msgdb-get-mark-alist msgdb))
@@ -854,13 +851,14 @@ Entering Folder mode calls the value of `wl-summary-mode-hook'."
                  (intern (format "wl-summary-overview-entity-compare-by-%s"
                                  sort-by))))
       (message "Sorting by %s...done" sort-by)
-      (elmo-msgdb-set-overview wl-summary-buffer-msgdb
+      (elmo-msgdb-set-overview (wl-summary-buffer-msgdb)
                               overview))
     (setq curp overview)
     (set-buffer cur-buf)
     (setq wl-thread-entity-hashtb (elmo-make-hash (* (length overview) 2)))
     (setq wl-thread-entity-list nil)
     (setq wl-thread-entities nil)
+    (setq wl-summary-buffer-number-list nil)
     (setq wl-summary-buffer-target-mark-list nil)
     (setq wl-summary-buffer-refile-list nil)
     (setq wl-summary-buffer-delete-list nil)
@@ -890,10 +888,12 @@ Entering Folder mode calls the value of `wl-summary-mode-hook'."
        (setq wl-summary-delayed-update (cdr wl-summary-delayed-update))))
     (message "Constructing summary structure...done")
     (set-buffer cur-buf)
-    (when (eq wl-summary-buffer-view 'thread)
-      (message "Inserting thread...")
-      (wl-thread-insert-top)
-      (message "Inserting thread...done"))
+    (if (eq wl-summary-buffer-view 'thread)
+       (progn
+         (message "Inserting thread...")
+         (wl-thread-insert-top)
+         (message "Inserting thread...done"))
+      (wl-summary-make-number-list))
     (when wl-use-scoring
       (setq wl-summary-scored nil)
       (wl-summary-score-headers nil msgdb
@@ -903,7 +903,9 @@ Entering Folder mode calls the value of `wl-summary-mode-hook'."
                 (setq expunged (wl-summary-score-update-all-lines)))
        (message "%d message(s) are expunged by scoring." (length expunged))))
     (wl-summary-set-message-modified)
-    (wl-summary-count-unread mark-alist)
+    (wl-summary-count-unread
+     (elmo-msgdb-get-mark-alist
+      (elmo-folder-msgdb wl-summary-buffer-elmo-folder)))
     (wl-summary-update-modeline)
     (goto-char (point-max))
     (forward-line -1)
@@ -953,10 +955,14 @@ Entering Folder mode calls the value of `wl-summary-mode-hook'."
       "folder mode"))
 
 (defun wl-summary-set-message-modified ()
+  (elmo-folder-set-message-modified-internal
+   wl-summary-buffer-elmo-folder t)
   (setq wl-summary-buffer-message-modified t))
 (defun wl-summary-message-modified-p ()
   wl-summary-buffer-message-modified)
 (defun wl-summary-set-mark-modified ()
+  (elmo-folder-set-mark-modified-internal
+   wl-summary-buffer-elmo-folder t)
   (setq wl-summary-buffer-mark-modified t))
 (defun wl-summary-mark-modified-p ()
   wl-summary-buffer-mark-modified)
@@ -965,41 +971,6 @@ Entering Folder mode calls the value of `wl-summary-mode-hook'."
 (defun wl-summary-thread-modified-p ()
   wl-summary-buffer-thread-modified)
 
-(defun wl-summary-msgdb-save ()
-  "Save msgdb if modified."
-  (when wl-summary-buffer-msgdb
-    (save-excursion
-      (let (path)
-       (when (wl-summary-message-modified-p)
-         (setq path (elmo-msgdb-expand-path wl-summary-buffer-folder-name))
-         (elmo-msgdb-overview-save
-          path
-          (elmo-msgdb-get-overview wl-summary-buffer-msgdb))
-         (elmo-msgdb-number-save
-          path
-          (elmo-msgdb-get-number-alist wl-summary-buffer-msgdb))
-         (elmo-folder-set-info-max-by-numdb
-          (elmo-string wl-summary-buffer-folder-name)
-          (elmo-msgdb-get-number-alist
-           wl-summary-buffer-msgdb))
-         (setq wl-summary-buffer-message-modified nil)
-         (run-hooks 'wl-summary-buffer-message-saved-hook))
-       (when (wl-summary-mark-modified-p)
-         (or path
-             (setq path (elmo-msgdb-expand-path
-                         wl-summary-buffer-folder-name)))
-         (elmo-msgdb-mark-save
-          path
-          (elmo-msgdb-get-mark-alist wl-summary-buffer-msgdb))
-;;;      (elmo-folder-set-info-hashtb
-;;;       (elmo-string wl-summary-buffer-folder-name)
-;;;       nil nil
-;;;       0
-;;;       (+ wl-summary-buffer-new-count wl-summary-buffer-unread-count))
-;;;      (setq wl-folder-info-alist-modified t)
-         (setq wl-summary-buffer-mark-modified nil)
-         (run-hooks 'wl-summary-buffer-mark-saved-hook))))))
-
 (defsubst wl-summary-cleanup-temp-marks (&optional sticky)
   (if (or wl-summary-buffer-refile-list
          wl-summary-buffer-copy-list
@@ -1024,7 +995,8 @@ Entering Folder mode calls the value of `wl-summary-mode-hook'."
   (setq wl-summary-scored nil))
 
 ;; a subroutine for wl-summary-exit/wl-save-status
-(defun wl-summary-save-status (&optional sticky)
+;; Note that folder is not commited here.
+(defun wl-summary-save-view ()
   ;; already in summary buffer.
   (when wl-summary-buffer-persistent
     ;; save the current summary buffer view.
@@ -1032,9 +1004,7 @@ Entering Folder mode calls the value of `wl-summary-mode-hook'."
             (or (wl-summary-message-modified-p)
                 (wl-summary-mark-modified-p)
                 (wl-summary-thread-modified-p)))
-       (wl-summary-save-view-cache))
-    ;; save msgdb ...
-    (wl-summary-msgdb-save)))
+       (wl-summary-save-view-cache))))
 
 (defun wl-summary-force-exit ()
   "Exit current summary.  Buffer is deleted even the buffer is sticky."
@@ -1046,34 +1016,48 @@ Entering Folder mode calls the value of `wl-summary-mode-hook'."
   (interactive "P")
   (let ((summary-buf (current-buffer))
        (sticky (wl-summary-sticky-p))
-       (message-buf (get-buffer wl-message-buf-name))
        summary-win
        message-buf message-win
        folder-buf folder-win)
-    (if wl-summary-buffer-exit-func
-       (funcall wl-summary-buffer-exit-func)
+    (run-hooks 'wl-summary-exit-pre-hook)
+    (if wl-summary-buffer-exit-function
+       (funcall wl-summary-buffer-exit-function)
       (wl-summary-cleanup-temp-marks sticky)
       (unwind-protect
          ;; save summary status
          (progn
-           (wl-summary-save-status sticky)
-           (elmo-commit wl-summary-buffer-folder-name)
-           (if wl-use-scoring
-               (wl-score-save)))
+           (wl-summary-save-view)
+           (if (or force-exit (not sticky))
+               (elmo-folder-close wl-summary-buffer-elmo-folder)
+             (elmo-folder-commit wl-summary-buffer-elmo-folder)
+             (elmo-folder-check wl-summary-buffer-elmo-folder))
+           (if wl-use-scoring (wl-score-save)))
        ;; for sticky summary
        (wl-delete-all-overlays)
        (setq wl-summary-buffer-disp-msg nil)
        (elmo-kill-buffer wl-summary-search-buf-name)
        ;; delete message window if displayed.
-       (if (setq message-buf (get-buffer wl-message-buf-name))
-           (if (setq message-win (get-buffer-window message-buf))
-               (delete-window message-win)))
+       (if (and wl-message-buffer (get-buffer-window wl-message-buffer))
+           (delete-window (get-buffer-window wl-message-buffer)))
+       (if (and wl-summary-use-frame
+                (> (length (visible-frame-list)) 1))
+           (delete-frame))
        (if (setq folder-buf (get-buffer wl-folder-buffer-name))
-           (if (setq folder-win (get-buffer-window folder-buf))
-               ;; folder win is already displayed.
-               (select-window folder-win)
-             ;; folder win is not displayed.
-             (switch-to-buffer folder-buf))
+           (if wl-summary-use-frame
+               (let (select-frame)
+                 (save-selected-window
+                   (dolist (frame (visible-frame-list))
+                     (select-frame frame)
+                     (if (get-buffer-window folder-buf)
+                         (setq select-frame frame))))
+                 (if select-frame
+                     (select-frame select-frame)
+                   (switch-to-buffer folder-buf)))
+             (if (setq folder-win (get-buffer-window folder-buf))
+                 ;; folder win is already displayed.
+                 (select-window folder-win)
+               ;; folder win is not displayed.
+               (switch-to-buffer folder-buf)))
          ;; currently no folder buffer
          (wl-folder))
        (and wl-folder-move-cur-folder
@@ -1091,41 +1075,12 @@ Entering Folder mode calls the value of `wl-summary-mode-hook'."
                (not sticky))
            (progn
              (set-buffer summary-buf)
-             (and (get-buffer wl-message-buf-name)
-                  (kill-buffer wl-message-buf-name))
-             ;; kill buffers of mime-view-caesar
-             (wl-kill-buffers
-              (format "^%s-([0-9 ]+)$" (regexp-quote wl-message-buf-name)))
              (kill-buffer summary-buf)))
        (run-hooks 'wl-summary-exit-hook)))))
 
-(defun wl-summary-sync-force-update (&optional unset-cursor)
+(defun wl-summary-sync-force-update (&optional unset-cursor no-check)
   (interactive)
-  (let ((msgdb-dir (elmo-msgdb-expand-path wl-summary-buffer-folder-name))
-       (type (elmo-folder-get-type wl-summary-buffer-folder-name))
-       ret-val seen-list)
-    (unwind-protect
-       (progn
-         (if wl-summary-buffer-persistent
-             (setq seen-list (elmo-msgdb-seen-load msgdb-dir)))
-         (setq ret-val (wl-summary-sync-update3 seen-list unset-cursor))
-         (if wl-summary-buffer-persistent
-             (progn
-               (if (and (eq type 'imap4)
-                        (not (elmo-folder-plugged-p
-                              wl-summary-buffer-folder-name)))
-                   (let* ((msgdb wl-summary-buffer-msgdb)
-                          (number-alist (elmo-msgdb-get-number-alist msgdb)))
-                     (elmo-mark-as-read wl-summary-buffer-folder-name
-                                        (mapcar
-                                         (lambda (msgid)
-                                           (car (rassoc msgid number-alist)))
-                                         seen-list) msgdb)))
-               (elmo-msgdb-seen-save msgdb-dir nil))))
-      (set-buffer (current-buffer)))
-    (if (interactive-p)
-       (message "%s" ret-val))
-    ret-val))
+  (wl-summary-sync-update unset-cursor nil no-check))
 
 (defsubst wl-summary-sync-all-init ()
   (wl-summary-cleanup-temp-marks)
@@ -1134,10 +1089,10 @@ Entering Folder mode calls the value of `wl-summary-mode-hook'."
   (wl-summary-set-mark-modified)
   (setq wl-thread-entity-hashtb (elmo-make-hash
                                 (* (length (elmo-msgdb-get-number-alist
-                                            wl-summary-buffer-msgdb)) 2)))
-  (setq wl-summary-buffer-msgdb (elmo-msgdb-clear)) ;;'(nil nil nil nil))
+                                            (wl-summary-buffer-msgdb))) 2)))
   (setq wl-thread-entity-list nil)
   (setq wl-thread-entities nil)
+  (setq wl-summary-buffer-number-list nil)
   (setq wl-summary-buffer-target-mark-list nil)
   (setq wl-summary-buffer-refile-list nil)
   (setq wl-summary-buffer-copy-list nil)
@@ -1146,41 +1101,13 @@ Entering Folder mode calls the value of `wl-summary-mode-hook'."
 
 (defun wl-summary-sync (&optional unset-cursor force-range)
   (interactive)
-  (let* ((folder wl-summary-buffer-folder-name)
+  (let* ((folder wl-summary-buffer-elmo-folder)
         (inhibit-read-only t)
         (buffer-read-only nil)
-        (msgdb-dir (elmo-msgdb-expand-path
-                    folder))
-        (range (or force-range (wl-summary-input-range folder)))
-        mes seen-list killed-list)
-    (cond ((or (string= range "all")
-              (string= range "all-visible"))
-          ;; initialize buffer local databases.
-          (unless (elmo-folder-plugged-p folder) ; forbidden
-            (error "Unplugged"))
-          (setq seen-list
-                (nconc
-                 (elmo-msgdb-mark-alist-to-seen-list
-                  (elmo-msgdb-get-number-alist
-                   wl-summary-buffer-msgdb)
-                  (elmo-msgdb-get-mark-alist
-                   wl-summary-buffer-msgdb)
-                  (concat wl-summary-important-mark
-                          wl-summary-read-uncached-mark))
-                 (elmo-msgdb-seen-load msgdb-dir)))
-          (setq killed-list (elmo-msgdb-killed-list-load msgdb-dir))
-          (elmo-clear-killed wl-summary-buffer-folder-name)
-          (condition-case nil
-              (setq mes (wl-summary-sync-update3 seen-list unset-cursor
-                                                 (string= range "all")))
-            (quit
-             ;; Resume killed-list if quit.
-             (message "") ; clear minibuffer.
-             (elmo-msgdb-killed-list-save msgdb-dir killed-list)))
-          (elmo-msgdb-seen-save msgdb-dir nil) ; delete all seen.
-          (if mes (message "%s" mes)))
-;;;       (wl-summary-sync-all folder t))
-         ((string= range "rescan")
+        (msgdb-dir (elmo-folder-msgdb-path folder))
+        (range (or force-range (wl-summary-input-range
+                                (elmo-folder-name-internal folder)))))
+    (cond ((string= range "rescan")
           (let ((msg (wl-summary-message-number)))
             (wl-summary-rescan)
             (and msg (wl-summary-jump-to-msg msg))))
@@ -1189,18 +1116,23 @@ Entering Folder mode calls the value of `wl-summary-mode-hook'."
                 wl-use-scoring)
             (wl-summary-rescan)
             (and msg (wl-summary-jump-to-msg msg))))
+         ((string= range "cache-status")
+          (let ((msg (wl-summary-message-number))
+                wl-use-scoring)
+            (wl-summary-resume-cache-status)
+            (and msg (wl-summary-jump-to-msg msg))))
          ((or (string-match "last:" range)
               (string-match "first:" range))
-          (wl-summary-goto-folder-subr (concat "/" range "/" folder)
-                                       'force-update nil nil t))
-         ((string= range "no-sync")
-          ;; do nothing.
-          )
+          (wl-summary-goto-folder-subr
+           (wl-folder-get-elmo-folder (concat "/" range "/"
+                                              (elmo-folder-name-internal
+                                               folder)))
+           'force-update nil nil t))
          (t
-          (setq seen-list (elmo-msgdb-seen-load msgdb-dir))
-          (setq mes (wl-summary-sync-update3 seen-list unset-cursor))
-          (elmo-msgdb-seen-save msgdb-dir nil) ; delete all seen.
-          (if mes (message "%s" mes))))))
+          (wl-summary-sync-update unset-cursor
+                                  (cond ((string= range "all") 'all)
+                                        ((string= range "all-visible")
+                                         'visible-only)))))))
 
 (defvar wl-summary-edit-addresses-candidate-fields
   ;; First element becomes default.
@@ -1234,8 +1166,8 @@ Entering Folder mode calls the value of `wl-summary-mode-hook'."
   ;; returns nil if there's no change.
   (if (elmo-get-hash-val (downcase the-email) wl-address-petname-hash)
       (let (char)
-       (message (format "'%s' already exists. (e)dit/(d)elete/(c)ancel?"
-                        the-email))
+       (message "'%s' already exists. (e)dit/(d)elete/(c)ancel?"
+                the-email)
        (while (not (or (eq (setq char (read-char)) ?\r)
                        (eq char ?\n)
                        (eq char ? )
@@ -1250,31 +1182,29 @@ Entering Folder mode calls the value of `wl-summary-mode-hook'."
              (eq char ?\r)
              (eq char ? ))
          ;; Change Addresses
-         (wl-address-petname-add-or-change
+         (wl-address-add-or-change
           the-email
-          (elmo-get-hash-val the-email wl-address-petname-hash)
           (wl-address-header-extract-realname
            (cdr (assoc
                  (let ((completion-ignore-case t) comp)
                    (setq comp
                          (try-completion the-email wl-address-completion-list))
                    (if (equal comp t) the-email comp))
-                 wl-address-completion-list))) t)
+                 wl-address-completion-list))))
          "edited")
         ((eq char ?d)
          ;; Delete Addresses
          (if (y-or-n-p (format "Delete '%s'? "
                                the-email))
              (progn
-               (wl-address-petname-delete the-email)
+               (wl-address-delete the-email)
                "deleted")
            (message "")
            nil))
         (t (message "")
            nil)))
     ;; Add Petname
-    (wl-address-petname-add-or-change
-     the-email name-in-addr name-in-addr)
+    (wl-address-add-or-change the-email name-in-addr)
     "added"))
 
 (defun wl-summary-edit-addresses (&optional addr-str)
@@ -1285,41 +1215,40 @@ Optional argument ADDR-STR is used as a target address if specified."
   (if (null (wl-summary-message-number))
       (message "No message.")
     (save-excursion
-      (wl-summary-set-message-buffer-or-redisplay))
-    (let* ((charset wl-summary-buffer-mime-charset)
-          (candidates
-           (with-current-buffer (wl-message-get-original-buffer)
-             (wl-summary-edit-addresses-collect-candidate-fields
-              charset)))
-          address pair result)
-      (if addr-str
-         (setq address addr-str)
-       (when candidates
-         (setq address (car (car candidates)))
-         (setq address
-               (completing-read
-                (format "Target address (%s): " address)
-                (mapcar
-                 (function (lambda (x) (cons (car x) (car x))))
-                 candidates)
-                nil nil nil nil address))))
-      (when address
-       (setq pair (assoc address candidates))
-       (unless pair
-         (setq pair (cons address nil)))
-       (when (setq result (wl-summary-edit-addresses-subr (car pair) (cdr pair)))
-         ;; update alias
-         (wl-status-update)
-         (setq address (assoc (car pair) wl-address-list))
-         (if address
-             (message "%s, %s, <%s> is %s."
-                      (nth 2 address)
-                      (nth 1 address)
-                      (nth 0 address)
-                      result)))
+      (let* ((charset wl-summary-buffer-mime-charset)
+            (candidates
+             (with-current-buffer (wl-summary-get-original-buffer)
+               (wl-summary-edit-addresses-collect-candidate-fields
+                charset)))
+            address pair result)
+       (if addr-str
+           (setq address addr-str)
+         (when candidates
+           (setq address (car (car candidates)))
+           (setq address
+                 (completing-read
+                  (format "Target address (%s): " address)
+                  (mapcar
+                   (function (lambda (x) (cons (car x) (car x))))
+                   candidates)
+                  nil nil nil nil address))))
+       (when address
+         (setq pair (assoc address candidates))
+         (unless pair
+           (setq pair (cons address nil)))
+         (when (setq result (wl-summary-edit-addresses-subr (car pair) (cdr pair)))
+           ;; update alias
+           (wl-status-update)
+           (setq address (assoc (car pair) wl-address-list))
+           (if address
+               (message "%s, %s, <%s> is %s."
+                        (nth 2 address)
+                        (nth 1 address)
+                        (nth 0 address)
+                        result)))
 ;;; i'd like to update summary-buffer, but...
 ;;;    (wl-summary-rescan)
-       (run-hooks 'wl-summary-edit-addresses-hook)))))
+         (run-hooks 'wl-summary-edit-addresses-hook))))))
 
 (defun wl-summary-incorporate (&optional arg)
   "Check and prefetch all uncached messages.
@@ -1335,102 +1264,78 @@ If ARG is non-nil, checking is omitted."
   "Returns status-mark. if skipped, returns nil."
   ;; prefetching procedure.
   (save-excursion
-    (let* ((msgdb wl-summary-buffer-msgdb)
+    (let* ((msgdb (wl-summary-buffer-msgdb))
           (mark-alist (elmo-msgdb-get-mark-alist msgdb))
           (number-alist (elmo-msgdb-get-number-alist msgdb))
           (message-id (cdr (assq number number-alist)))
-          (ov (assoc message-id
-                     (elmo-msgdb-get-overview msgdb)))
+          (ov (elmo-msgdb-overview-get-entity message-id msgdb))
           (entity ov)
           (size (elmo-msgdb-overview-entity-get-size ov))
           (inhibit-read-only t)
           (buffer-read-only nil)
+          (file-cached (elmo-file-cache-exists-p message-id))
           (force-read (and size
                            (or (null wl-prefetch-threshold)
                                (< size wl-prefetch-threshold))))
           mark new-mark)
-      (if (or arg
-             (null (elmo-cache-exists-p message-id)))
-         (unwind-protect
-             (progn
-               (when (and size (not force-read) wl-prefetch-confirm)
-                 (setq force-read
-                       (save-restriction
-                         (widen)
-                         (y-or-n-p
-                          (format
-                           "Message from %s has %d bytes.  Prefetch it? "
-                           (concat
-                            "[ "
-                            (save-match-data
-                              (wl-set-string-width
-                               wl-from-width
-                               (wl-summary-from-func-internal
-                                (eword-decode-string
-                                 (elmo-delete-char
-                                  ?\"
-                                  (or
-                                   (elmo-msgdb-overview-entity-get-from ov)
-                                   "??")))))) " ]")
-                           size))))
-                 (message ""))         ; flush.
-               (setq mark (cadr (assq number mark-alist)))
-               (if force-read
-                   (save-excursion
-                     (save-match-data
-                       (if (and (null (elmo-folder-plugged-p
-                                       wl-summary-buffer-folder-name))
-                                elmo-enable-disconnected-operation)
-                           (progn;; append-queue for offline
-                             (elmo-dop-prefetch-msgs
-                              wl-summary-buffer-folder-name (list number))
-                             (setq new-mark
-                                   (cond
-                                    ((string= mark
-                                              wl-summary-unread-uncached-mark)
-                                     wl-summary-unread-cached-mark)
-                                    ((string= mark wl-summary-new-mark)
-                                     (setq wl-summary-buffer-new-count
-                                           (- wl-summary-buffer-new-count 1))
-                                     (setq wl-summary-buffer-unread-count
-                                           (+ wl-summary-buffer-unread-count 1))
-                                     wl-summary-unread-cached-mark)
-                                    ((or (null mark)
-                                         (string= mark wl-summary-read-uncached-mark))
-                                     (setq wl-summary-buffer-unread-count
-                                           (+ wl-summary-buffer-unread-count 1))
-                                     wl-summary-unread-cached-mark)
-                                    (t mark))))
-                         ;; online
-                         (elmo-prefetch-msg wl-summary-buffer-folder-name
-                                            number
-                                            (wl-message-get-original-buffer)
-                                            msgdb)
-                         (setq new-mark
-                               (cond
-                                ((string= mark
-                                          wl-summary-unread-uncached-mark)
-                                 wl-summary-unread-cached-mark)
-                                ((string= mark wl-summary-new-mark)
-                                 (setq wl-summary-buffer-new-count
-                                       (- wl-summary-buffer-new-count 1))
-                                 (setq wl-summary-buffer-unread-count
-                                       (+ wl-summary-buffer-unread-count 1))
-                                 wl-summary-unread-cached-mark)
-                                ((string= mark wl-summary-read-uncached-mark)
-                                 nil)
-                                (t mark))))
-                       (setq mark-alist (elmo-msgdb-mark-set
-                                         mark-alist number new-mark))
-                       (or new-mark (setq new-mark " "))
-                       (elmo-msgdb-set-mark-alist msgdb mark-alist)
-                       (wl-summary-set-mark-modified)
-                       (wl-summary-update-modeline)
-                       (wl-folder-update-unread
-                        wl-summary-buffer-folder-name
-                        (+ wl-summary-buffer-unread-count
-                           wl-summary-buffer-new-count)))
-                     new-mark))))))))
+      (unwind-protect
+         (progn
+           (when (and (or arg (not file-cached))
+                      size (not force-read) wl-prefetch-confirm)
+             (setq force-read
+                   (save-restriction
+                     (widen)
+                     (y-or-n-p
+                      (format
+                       "Message from %s has %d bytes.  Prefetch it? "
+                       (concat
+                        "[ "
+                        (save-match-data
+                          (wl-set-string-width
+                           wl-summary-from-width
+                           (wl-summary-from-func-internal
+                            (eword-decode-string
+                             (elmo-delete-char
+                              ?\"
+                              (or
+                               (elmo-msgdb-overview-entity-get-from ov)
+                               "??")))))) " ]")
+                       size))))
+             (message ""))             ; flush.
+           (setq mark (cadr (assq number mark-alist)))
+           (if force-read
+               (save-excursion
+                 (save-match-data
+                   ;; online
+                   (if (or arg (not file-cached))
+                       (elmo-message-encache
+                        wl-summary-buffer-elmo-folder
+                        number))
+                   (setq new-mark
+                         (cond
+                          ((string= mark
+                                    wl-summary-unread-uncached-mark)
+                           wl-summary-unread-cached-mark)
+                          ((string= mark wl-summary-new-mark)
+                           (setq wl-summary-buffer-new-count
+                                 (- wl-summary-buffer-new-count 1))
+                           (setq wl-summary-buffer-unread-count
+                                 (+ wl-summary-buffer-unread-count 1))
+                           wl-summary-unread-cached-mark)
+                          ((string= mark wl-summary-read-uncached-mark)
+                           nil)
+                          (t mark)))
+                   (setq mark-alist (elmo-msgdb-mark-set
+                                     mark-alist number new-mark))
+                   (or new-mark (setq new-mark " "))
+                   (elmo-msgdb-set-mark-alist msgdb mark-alist)
+                   (wl-summary-set-mark-modified)
+                   (wl-summary-update-modeline)
+                   (wl-folder-update-unread
+                    (wl-summary-buffer-folder-name)
+                    (+ wl-summary-buffer-unread-count
+                       wl-summary-buffer-new-count)))
+                 new-mark)))))))
 
 ;;(defvar wl-summary-message-uncached-marks
 ;;  (list wl-summary-new-mark
@@ -1453,15 +1358,15 @@ If ARG is non-nil, checking is omitted."
        (goto-char (point-min))
        (while (not (eobp))
          (beginning-of-line)
-         (when (looking-at "^ *\\([0-9]+\\)[^0-9]\\([^0-9]\\)")
+         (when (looking-at "^ *\\(-?[0-9]+\\)[^0-9]\\([^0-9]\\)")
            (setq mark (wl-match-buffer 2))
            (setq msg (string-to-int (wl-match-buffer 1)))
            (if (or (and (null prefetch-marks)
                         msg
-                        (null (elmo-cache-exists-p
+                        (null (elmo-file-cache-exists-p
                                (cdr (assq msg
                                           (elmo-msgdb-get-number-alist
-                                           wl-summary-buffer-msgdb))))))
+                                           (wl-summary-buffer-msgdb)))))))
                    (member mark prefetch-marks))
                (setq targets (nconc targets (list msg))))
            (setq entity (wl-thread-get-entity msg))
@@ -1507,16 +1412,17 @@ If ARG is non-nil, checking is omitted."
   (save-excursion
     (save-match-data
       (beginning-of-line)
-      (when (looking-at "^ *\\([0-9]+\\)[^0-9]\\([^0-9]\\)")
+      (when (looking-at "^ *\\(-?[0-9]+\\)[^0-9]\\([^0-9]\\)")
        (goto-char (match-beginning 2))
        (let ((inhibit-read-only t)
              (buffer-read-only nil)
+             (beg (match-beginning 2))
+             (end (match-end 2))
              mark)
          (setq mark (wl-summary-prefetch-msg
                      (string-to-int (wl-match-buffer 1)) arg))
          (when mark
-           (delete-region (match-beginning 2)
-                          (match-end 2))
+           (delete-region beg end)
            (insert mark)
            (if wl-summary-highlight
                (wl-highlight-summary-current-line)))
@@ -1616,7 +1522,7 @@ If ARG is non-nil, checking is omitted."
        (while (not (eobp))
          (wl-summary-mark-as-read t)
          (forward-line 1)))))
-  (wl-summary-count-unread (elmo-msgdb-get-mark-alist wl-summary-buffer-msgdb))
+  (wl-summary-count-unread (elmo-msgdb-get-mark-alist (wl-summary-buffer-msgdb)))
   (wl-summary-update-modeline))
 
 (defun wl-summary-mark-as-unread-region (beg end)
@@ -1649,7 +1555,7 @@ If ARG is non-nil, checking is omitted."
        (while (not (eobp))
          (wl-summary-mark-as-unread)
          (forward-line 1)))))
-  (wl-summary-count-unread (elmo-msgdb-get-mark-alist wl-summary-buffer-msgdb))
+  (wl-summary-count-unread (elmo-msgdb-get-mark-alist (wl-summary-buffer-msgdb)))
   (wl-summary-update-modeline))
 
 (defun wl-summary-mark-as-important-region (beg end)
@@ -1680,16 +1586,16 @@ If ARG is non-nil, checking is omitted."
        (while (not (eobp))
          (wl-summary-mark-as-important)
          (forward-line 1)))))
-  (wl-summary-count-unread (elmo-msgdb-get-mark-alist wl-summary-buffer-msgdb))
+  (wl-summary-count-unread (elmo-msgdb-get-mark-alist (wl-summary-buffer-msgdb)))
   (wl-summary-update-modeline))
 
 (defun wl-summary-mark-as-read-all ()
   (interactive)
   (if (or (not (interactive-p))
          (y-or-n-p "Mark all messages as read? "))
-      (let* ((folder wl-summary-buffer-folder-name)
+      (let* ((folder wl-summary-buffer-elmo-folder)
             (cur-buf (current-buffer))
-            (msgdb wl-summary-buffer-msgdb)
+            (msgdb (wl-summary-buffer-msgdb))
 ;;;         (number-alist (elmo-msgdb-get-number-alist msgdb))
             (mark-alist (elmo-msgdb-get-mark-alist msgdb))
             (malist mark-alist)
@@ -1698,17 +1604,21 @@ If ARG is non-nil, checking is omitted."
             (case-fold-search nil)
             msg mark)
        (message "Setting all msgs as read...")
-       (elmo-mark-as-read folder (wl-summary-collect-unread mark-alist)
-                          msgdb)
+       (elmo-folder-mark-as-read folder
+                                 (elmo-folder-list-unreads
+                                  folder
+                                  (list wl-summary-unread-cached-mark
+                                        wl-summary-unread-uncached-mark
+                                        wl-summary-new-mark)))
        (save-excursion
          (goto-char (point-min))
-         (while (re-search-forward "^ *\\([0-9]+\\)[^0-9]\\([^0-9 ]\\)" nil t)
+         (while (re-search-forward "^ *\\(-?[0-9]+\\)[^0-9]\\([^0-9 ]\\)" nil t)
            (setq msg (string-to-int (wl-match-buffer 1)))
            (setq mark (wl-match-buffer 2))
            (when (and (not (string= mark wl-summary-important-mark))
                       (not (string= mark wl-summary-read-uncached-mark)))
              (delete-region (match-beginning 2) (match-end 2))
-             (if (or (not (elmo-use-cache-p folder msg))
+             (if (or (not (elmo-message-use-cache-p folder msg))
                      (string= mark wl-summary-unread-cached-mark))
                  (progn
                    (insert " ")
@@ -1732,7 +1642,7 @@ If ARG is non-nil, checking is omitted."
        (wl-summary-set-mark-modified)
        (set-buffer cur-buf); why is this needed???
        (elmo-msgdb-set-mark-alist msgdb mark-alist)
-       (wl-folder-update-unread wl-summary-buffer-folder-name 0)
+       (wl-folder-update-unread (wl-summary-buffer-folder-name) 0)
        (setq wl-summary-buffer-unread-count 0)
        (setq wl-summary-buffer-new-count    0)
        (wl-summary-update-modeline)
@@ -1745,15 +1655,15 @@ If ARG is non-nil, checking is omitted."
   (save-excursion
     (let* ((inhibit-read-only t)
           (buffer-read-only nil)
-          (folder wl-summary-buffer-folder-name)
-          (msgdb wl-summary-buffer-msgdb)
+          (folder wl-summary-buffer-elmo-folder)
+          (msgdb (wl-summary-buffer-msgdb))
           (mark-alist (elmo-msgdb-get-mark-alist msgdb))
           (number-alist (elmo-msgdb-get-number-alist msgdb))
           (case-fold-search nil)
           mark number unread new-mark)
 ;;;   (re-search-backward "^ *[0-9]+..[0-9]+/[0-9]+" nil t) ; set cursor line
       (beginning-of-line)
-      (when (looking-at "^ *\\([0-9]+\\)[^0-9]\\([^0-9]\\)")
+      (when (looking-at "^ *\\(-?[0-9]+\\)[^0-9]\\([^0-9]\\)")
        (progn
          (setq mark (wl-match-buffer 2))
          (cond
@@ -1771,9 +1681,11 @@ If ARG is non-nil, checking is omitted."
            (delete-region (match-beginning 2) (match-end 2))
            (goto-char (match-beginning 2))
            (insert new-mark)
-           (elmo-cache-delete (cdr (assq number number-alist))
-                              wl-summary-buffer-folder-name
-                              number)
+           (elmo-file-cache-delete
+            (elmo-file-cache-get-path
+             (elmo-message-field wl-summary-buffer-elmo-folder
+                                 number
+                                 'message-id)))
            (setq mark-alist
                  (elmo-msgdb-mark-set mark-alist number new-mark))
            (elmo-msgdb-set-mark-alist msgdb mark-alist)
@@ -1785,9 +1697,9 @@ If ARG is non-nil, checking is omitted."
 (defun wl-summary-resume-cache-status ()
   "Resume the cache status of all messages in the current folder."
   (interactive)
-  (let* ((folder wl-summary-buffer-folder-name)
+  (let* ((folder wl-summary-buffer-elmo-folder)
         (cur-buf (current-buffer))
-        (msgdb wl-summary-buffer-msgdb)
+        (msgdb (wl-summary-buffer-msgdb))
         (number-alist (elmo-msgdb-get-number-alist msgdb))
         (mark-alist (elmo-msgdb-get-mark-alist msgdb))
         (inhibit-read-only t)
@@ -1797,16 +1709,16 @@ If ARG is non-nil, checking is omitted."
     (message "Resuming cache status...")
     (save-excursion
       (goto-char (point-min))
-      (while (re-search-forward "^ *\\([0-9]+\\)[^0-9]\\([^0-9]\\)" nil t)
+      (while (re-search-forward "^ *\\(-?[0-9]+\\)[^0-9]\\([^0-9]\\)" nil t)
        (setq msg (string-to-int
                   (wl-match-buffer 1)))
        (setq mark (wl-match-buffer 2))
        (setq msgid (cdr (assq msg number-alist)))
        (setq set-mark nil)
-       (if (elmo-cache-exists-p msgid folder msg)
+       (if (elmo-file-cache-exists-p msgid)
            (if (or
                 (string= mark wl-summary-unread-uncached-mark) ; U -> !
-                (string= mark wl-summary-new-mark)             ; N -> !
+                (string= mark wl-summary-new-mark)             ; N -> !
                 )
                (setq set-mark wl-summary-unread-cached-mark)
              (if (string= mark wl-summary-read-uncached-mark)  ; u -> ' '
@@ -1834,7 +1746,7 @@ If ARG is non-nil, checking is omitted."
       (set-buffer-modified-p nil))))
 
 (defun wl-summary-resume-marks-and-highlight ()
-  (let* ((msgdb wl-summary-buffer-msgdb)
+  (let* ((msgdb (wl-summary-buffer-msgdb))
         (mark-alist (elmo-msgdb-get-mark-alist msgdb))
 ;;;     (number-alist (elmo-msgdb-get-number-alist msgdb))
         (count (count-lines (point-min)(point-max)))
@@ -1862,7 +1774,7 @@ If ARG is non-nil, checking is omitted."
     (message "Resuming all marks...done")))
 
 (defun wl-summary-resume-marks ()
-  (let* ((msgdb wl-summary-buffer-msgdb)
+  (let* ((msgdb (wl-summary-buffer-msgdb))
         (mark-alist (elmo-msgdb-get-mark-alist msgdb))
         (number-alist (elmo-msgdb-get-number-alist msgdb))
         (count (length mark-alist))
@@ -1873,7 +1785,7 @@ If ARG is non-nil, checking is omitted."
       (while mark-alist
        (setq entity (car mark-alist))
        (if (setq msg-num (car (rassoc (car entity) number-alist)))
-           (progn 
+           (progn
 ;;;          (goto-char (point-min))
              (if (re-search-forward (format "^ *%s \\( \\)" msg-num) nil t)
                  (progn
@@ -1919,7 +1831,8 @@ If ARG is non-nil, checking is omitted."
              (progn
                (delete-region (match-beginning 0) (match-end 0))
                (delete-char 1) ; delete '\n'
-               )))
+               (setq wl-summary-buffer-number-list
+                     (delq (car msgs) wl-summary-buffer-number-list)))))
        (when (and deleting-info
                   (> len elmo-display-progress-threshold))
          (setq i (1+ i))
@@ -1933,10 +1846,10 @@ If ARG is non-nil, checking is omitted."
                                    (unless deleting-info 'no-msg))
        (wl-thread-cleanup-symbols msgs2))
       (wl-summary-count-unread
-       (elmo-msgdb-get-mark-alist wl-summary-buffer-msgdb))
+       (elmo-msgdb-get-mark-alist (wl-summary-buffer-msgdb)))
       (wl-summary-update-modeline)
       (wl-folder-update-unread
-       wl-summary-buffer-folder-name
+       (wl-summary-buffer-folder-name)
        (+ wl-summary-buffer-unread-count wl-summary-buffer-new-count)))))
 
 (defun wl-summary-set-as-read-mark-alist (mark-alist)
@@ -1951,11 +1864,11 @@ If ARG is non-nil, checking is omitted."
     (while mark-alist
       (setq entity (car mark-alist))
       (when (setq pair (assoc (cadr entity) marks))
-       (if (elmo-use-cache-p wl-summary-buffer-folder-name
-                             (caar mark-alist))
+       (if (elmo-message-use-cache-p wl-summary-buffer-elmo-folder
+                                     (caar mark-alist))
            (if (cdr pair)
                (setcar (cdr entity) (cdr pair))
-               (setq ret-val (delete entity ret-val)))
+             (setq ret-val (delete entity ret-val)))
          (setq ret-val (delete entity ret-val))))
       (setq mark-alist (cdr mark-alist)))
     ret-val))
@@ -2045,29 +1958,26 @@ If ARG is non-nil, checking is omitted."
 (defun wl-summary-sync-marks ()
   "Update marks in summary."
   (interactive)
-  (let ((plugged (elmo-folder-plugged-p wl-summary-buffer-folder-name))
-       (last-progress 0)
+  (let ((last-progress 0)
        (i 0)
-       mark-alist unread-marks msgs mark importants unreads
-       importants-in-db unreads-in-db has-imap4 diff diffs
+       mark-alist unread-marks importants unreads
+       importants-in-db unreads-in-db diff diffs
        mes num-ma progress)
     ;; synchronize marks.
-    (when (not (eq (elmo-folder-get-type
-                   wl-summary-buffer-folder-name)
+    (when (not (eq (elmo-folder-type-internal
+                   wl-summary-buffer-elmo-folder)
                   'internal))
       (message "Updating marks...")
       (setq unread-marks (list wl-summary-unread-cached-mark
                               wl-summary-unread-uncached-mark
                               wl-summary-new-mark)
-           mark-alist (elmo-msgdb-get-mark-alist wl-summary-buffer-msgdb)
-            num-ma (length mark-alist)
-           importants (elmo-list-folder-important
-                       wl-summary-buffer-folder-name
-                       (elmo-msgdb-get-number-alist wl-summary-buffer-msgdb))
-           unreads (elmo-list-folder-unread
-                    wl-summary-buffer-folder-name
-                    (elmo-msgdb-get-number-alist wl-summary-buffer-msgdb)
-                    (elmo-msgdb-get-mark-alist wl-summary-buffer-msgdb)
+           mark-alist (elmo-msgdb-get-mark-alist (wl-summary-buffer-msgdb))
+           num-ma (length mark-alist)
+           importants (elmo-folder-list-importants
+                       wl-summary-buffer-elmo-folder
+                       wl-summary-important-mark)
+           unreads (elmo-folder-list-unreads
+                    wl-summary-buffer-elmo-folder
                     unread-marks))
       (while mark-alist
        (if (string= (cadr (car mark-alist))
@@ -2112,251 +2022,185 @@ If ARG is non-nil, checking is omitted."
        (setq diffs (cdr diffs)))
       (if (interactive-p) (message mes)))))
 
-(defun wl-summary-confirm-appends (appends)
-  (let ((len (length appends))
-       in)
-    (if (> len wl-summary-update-confirm-threshold)
-       (if (y-or-n-p (format "Too many messages(%d).  Continue? " len))
-           appends
-         (setq in wl-summary-update-confirm-threshold)
-         (catch 'end
-           (while t
-             (setq in (read-from-minibuffer "Update number: "
-                                            (int-to-string in))
-                   in (string-to-int in))
-             (if (< len in)
-                 (throw 'end len))
-             (if (y-or-n-p (format "%d messages are disappeared.  OK? "
-                                   (max (- len in) 0)))
-                 (throw 'end in))))
-         (nthcdr (max (- len in) 0) appends))
-      appends)))
-
-(defun wl-summary-sync-update3 (&optional seen-list unset-cursor sync-all)
-  "Update the summary view."
+(defun wl-summary-sync-update (&optional unset-cursor sync-all no-check)
+  "Update the summary view to the newest folder status."
   (interactive)
-  (let* ((folder wl-summary-buffer-folder-name)
-        (cur-buf (current-buffer))
-        (number-alist (elmo-msgdb-get-number-alist wl-summary-buffer-msgdb))
-        (mark-alist (elmo-msgdb-get-mark-alist wl-summary-buffer-msgdb))
-        (overview (elmo-msgdb-get-overview wl-summary-buffer-msgdb))
-;;;     (location (elmo-msgdb-get-location msgdb))
+  (let* ((folder wl-summary-buffer-elmo-folder)
         (case-fold-search nil)
         (elmo-mime-charset wl-summary-buffer-mime-charset)
         (inhibit-read-only t)
         (buffer-read-only nil)
-        diff initial-append-list append-list delete-list has-nntp
-        i num result
         gc-message
-        in-folder
-        in-db curp
-        overview-append
-        entity ret-val crossed crossed2
-        update-thread update-top-list mark
-        expunged msgs unreads importants)
-;;; (setq seen-list nil) ;for debug.
-    (fset 'wl-summary-append-message-func-internal
-         (wl-summary-get-append-message-func))
-    ;; Flush pending append operations (disconnected operation).
-    (setq seen-list
-         (wl-summary-flush-pending-append-operations seen-list))
-    (goto-char (point-max))
-    (wl-folder-confirm-existence folder 'force)
-    (message "Checking folder diff...")
-    (elmo-commit folder)
-    (setq in-folder (elmo-list-folder folder sync-all))
-    (setq in-db (unless sync-all (sort (mapcar 'car number-alist) '<)))
-    (if (not elmo-use-killed-list)
-       (setq diff (if (eq (elmo-folder-get-type folder) 'multi)
-                      (elmo-multi-list-bigger-diff in-folder in-db)
-                    (elmo-list-bigger-diff in-folder in-db)))
-      (setq diff (elmo-list-diff in-folder in-db)))
-    (setq initial-append-list (car diff))
-    (setq delete-list (cadr diff))
-    (message "Checking folder diff...done")
-    ;; Confirm appended message number.
-    (setq append-list (wl-summary-confirm-appends initial-append-list))
-    (when (and elmo-use-killed-list
-              (not (eq (length initial-append-list)
-                       (length append-list)))
-              (setq diff (elmo-list-diff initial-append-list append-list)))
-      (elmo-msgdb-append-to-killed-list folder (car diff)))
-    ;; Setup sync-all
-    (if sync-all (wl-summary-sync-all-init))
-    ;; Don't delete important-marked msgs other than 'internal.
-    (unless (eq (elmo-folder-get-type folder) 'internal)
-      (setq delete-list
-           (wl-summary-delete-important-msgs-from-list delete-list
-                                                       mark-alist)))
-    (if (and has-nntp
-            (elmo-nntp-max-number-precedes-list-active-p))
-       ;; XXX this does not work correctly in rare case.
-       (setq delete-list
-             (wl-summary-delete-canceled-msgs-from-list
-              delete-list
-              wl-summary-buffer-msgdb)))
-    (if (or (equal diff '(nil nil))
-           (equal diff '(nil))
-           (and (eq (length delete-list) 0)
-                (eq (length initial-append-list) 0)))
+        overview number-alist mark-alist
+        curp num i new-msgdb
+        append-list delete-list crossed
+        update-thread update-top-list
+        expunged mes sync-result)
+    (unwind-protect
        (progn
-         ;; For max-number update...
-         (if (and (elmo-folder-contains-type folder 'nntp)
-                  (elmo-nntp-max-number-precedes-list-active-p)
-                  (elmo-update-number folder wl-summary-buffer-msgdb))
-             (wl-summary-set-message-modified)
-           (setq ret-val (format "No update is needed for \"%s\"" folder))))
-      (when delete-list
-       (message "Deleting...")
-       (elmo-msgdb-delete-msgs folder delete-list
-                               wl-summary-buffer-msgdb t) ; reserve cache.
-;;;    (set-buffer cur-buf)
-       (wl-summary-delete-messages-on-buffer delete-list "Deleting...")
-       (message "Deleting...done"))
-;;;   (set-buffer cur-buf)
-      ;; Change "New" marks to "Uncached Unread" marks.
-      (wl-summary-set-status-marks mark-alist
-                                  wl-summary-new-mark
-                                  wl-summary-unread-uncached-mark)
-      (wl-summary-set-status-marks-on-buffer
-       wl-summary-new-mark
-       wl-summary-unread-uncached-mark)
-      (setq num (length append-list))
-      (if append-list
-         (progn
-           (setq i 0)
-           (setq result (elmo-msgdb-create
-                         folder
-                         append-list
-                         wl-summary-new-mark
-                         wl-summary-unread-cached-mark ; !
-                         wl-summary-read-uncached-mark ; u ;; XXXX
-                         wl-summary-important-mark
-                         seen-list))
-           ;; delete duplicated messages.
-           (when (elmo-folder-contains-multi folder)
-             (setq crossed (elmo-multi-delete-crossposts
-                            wl-summary-buffer-msgdb result))
-             (setq result (cdr crossed))
-             (setq crossed (car crossed)))
-           (setq overview-append (car result))
-           (setq wl-summary-buffer-msgdb
-                 (elmo-msgdb-append wl-summary-buffer-msgdb result t))
-           ;; set these value for append-message-func
-           (setq overview (elmo-msgdb-get-overview wl-summary-buffer-msgdb))
-           (setq number-alist (elmo-msgdb-get-number-alist
-                               wl-summary-buffer-msgdb))
-           (setq mark-alist (elmo-msgdb-get-mark-alist
-                             wl-summary-buffer-msgdb))
-;;;        (setq location (elmo-msgdb-get-location msgdb))
-           (setq curp overview-append)
-           (setq num (length curp))
-           (setq wl-summary-delayed-update nil)
-           (elmo-kill-buffer wl-summary-search-buf-name)
-           (while curp
-             (setq entity (car curp))
-             (when (setq update-thread
-                         (wl-summary-append-message-func-internal
-                          entity overview mark-alist
-                          (not sync-all)))
-               (wl-append update-top-list update-thread))
-             (if elmo-use-database
-                 (elmo-database-msgid-put
-                  (car entity) folder
-                  (elmo-msgdb-overview-entity-get-number entity)))
-             (setq curp (cdr curp))
-             (when (> num elmo-display-progress-threshold)
-               (setq i (+ i 1))
-               (if (or (zerop (% i 5)) (= i num))
-                   (elmo-display-progress
-                    'wl-summary-sync-update3 "Updating thread..."
-                    (/ (* i 100) num)))))
-           (when wl-summary-delayed-update
-             (while wl-summary-delayed-update
-               (message "Parent (%d) of message %d is no entity"
-                        (caar wl-summary-delayed-update)
-                        (elmo-msgdb-overview-entity-get-number
-                         (cdar wl-summary-delayed-update)))
-               (when (setq update-thread
-                           (wl-summary-append-message-func-internal
-                            (cdar wl-summary-delayed-update)
-                            overview mark-alist (not sync-all) t))
-                 (wl-append update-top-list update-thread))
-               (setq wl-summary-delayed-update
-                     (cdr wl-summary-delayed-update))))
-           (when (and (eq wl-summary-buffer-view 'thread)
-                      update-top-list)
-             (wl-thread-update-indent-string-thread
-              (elmo-uniq-list update-top-list)))
-           (message "Updating thread...done")
-;;;        (set-buffer cur-buf)
-           ))
-      (wl-summary-set-message-modified)
-      (wl-summary-set-mark-modified)
-      (when (and sync-all (eq wl-summary-buffer-view 'thread))
-       (elmo-kill-buffer wl-summary-search-buf-name)
-       (message "Inserting thread...")
-       (setq wl-thread-entity-cur 0)
-       (wl-thread-insert-top)
-       (message "Inserting thread...done"))
-      (if elmo-use-database
-         (elmo-database-close))
-      (run-hooks 'wl-summary-sync-updated-hook)
-      (setq ret-val (format "Updated (-%d/+%d) message(s)"
-                           (length delete-list) num)))
-    ;; synchronize marks.
-    (if wl-summary-auto-sync-marks
-       (wl-summary-sync-marks))
-    ;; scoring
-    (when wl-use-scoring
-      (setq wl-summary-scored nil)
-      (wl-summary-score-headers nil wl-summary-buffer-msgdb
-                               (and sync-all
-                                    (wl-summary-rescore-msgs number-alist))
-                               sync-all)
-      (when (and wl-summary-scored
-                (setq expunged (wl-summary-score-update-all-lines)))
-       (setq ret-val (concat ret-val
-                             (format " (%d expunged)"
-                                     (length expunged))))))
-    ;; crosspost
-    (setq crossed2 (wl-summary-update-crosspost))
-    (if (or crossed crossed2)
-       (let ((crosses (+ (or crossed 0)
-                         (or crossed2 0))))
-         (setq ret-val
-               (if ret-val
-                   (concat ret-val
-                           (format " (%d crosspost)" crosses))
-                 (format "%d crosspost message(s)" crosses))))
-      (and ret-val
-          (setq ret-val (concat ret-val "."))))
-    ;; Update Folder mode
-    (wl-folder-set-folder-updated folder (list 0
-                                              (wl-summary-count-unread
-                                               (elmo-msgdb-get-mark-alist
-                                                wl-summary-buffer-msgdb))
-                                              (length in-folder)))
-    (wl-summary-update-modeline)
-    (wl-summary-buffer-number-column-detect t)
-    ;;
-    (unless unset-cursor
-      (goto-char (point-min))
-      (if (not (wl-summary-cursor-down t))
-         (progn
-           (goto-char (point-max))
-           (forward-line -1))
-       (if (and wl-summary-highlight
-                (not (get-text-property (point) 'face)))
-           (save-excursion
-             (forward-line (- 0
-                              (or
-                               wl-summary-partial-highlight-above-lines
-                               wl-summary-highlight-partial-threshold)))
-             (wl-highlight-summary (point) (point-max))))))
-    (wl-delete-all-overlays)
-    (set-buffer-modified-p nil)
-    ret-val))
+         (unless wl-summary-buffer-elmo-folder
+           (error "(Internal error) Folder is not set:%s" (buffer-name
+                                                           (current-buffer))))
+         (fset 'wl-summary-append-message-func-internal
+               (wl-summary-get-append-message-func))
+         ;; Flush pending append operations (disconnected operation).
+         ;;(setq seen-list
+         ;;(wl-summary-flush-pending-append-operations seen-list))
+         (goto-char (point-max))
+         (wl-folder-confirm-existence folder 'force)
+         (setq sync-result (elmo-folder-synchronize
+                            folder
+                            wl-summary-new-mark
+                            wl-summary-unread-uncached-mark
+                            wl-summary-unread-cached-mark
+                            wl-summary-read-uncached-mark
+                            wl-summary-important-mark
+                            sync-all no-check))
+         (setq new-msgdb (nth 0 sync-result))
+         (setq delete-list (nth 1 sync-result))
+         (setq crossed (nth 2 sync-result))
+         (if sync-result
+             (progn
+               ;; Setup sync-all
+               (if sync-all (wl-summary-sync-all-init))
+;    (if (and has-nntp
+;           (elmo-nntp-max-number-precedes-list-active-p))
+       ;; XXX this does not work correctly in rare case.
+;      (setq delete-list
+;            (wl-summary-delete-canceled-msgs-from-list
+;             delete-list
+;             (wl-summary-buffer-msgdb))))
+               (when delete-list
+                 (wl-summary-delete-messages-on-buffer delete-list "Deleting...")
+                 (message "Deleting...done"))
+               (when new-msgdb
+                 (wl-summary-set-status-marks-on-buffer
+                  wl-summary-new-mark
+                  wl-summary-unread-uncached-mark))
+               (setq append-list (elmo-msgdb-get-overview new-msgdb))
+               (setq curp append-list)
+               (setq num (length curp))
+               (when append-list
+                 (setq i 0)
+                 ;; set these value for append-message-func
+                 (setq overview (elmo-msgdb-get-overview
+                                 (elmo-folder-msgdb folder)))
+                 (setq number-alist (elmo-msgdb-get-number-alist
+                                     (elmo-folder-msgdb folder)))
+                 (setq mark-alist (elmo-msgdb-get-mark-alist
+                                   (elmo-folder-msgdb folder)))
+                 (setq wl-summary-delayed-update nil)
+                 (elmo-kill-buffer wl-summary-search-buf-name)
+                 (while curp
+                   (setq entity (car curp))
+                   (when (setq update-thread
+                               (wl-summary-append-message-func-internal
+                                entity overview mark-alist
+                                (not sync-all)))
+                     (wl-append update-top-list update-thread))
+                   (if elmo-use-database
+                       (elmo-database-msgid-put
+                        (car entity) (elmo-folder-name-internal folder)
+                        (elmo-msgdb-overview-entity-get-number entity)))
+                   (setq curp (cdr curp))
+                   (when (> num elmo-display-progress-threshold)
+                     (setq i (+ i 1))
+                     (if (or (zerop (% i 5)) (= i num))
+                         (elmo-display-progress
+                          'wl-summary-sync-update "Updating thread..."
+                          (/ (* i 100) num)))))
+                 (when wl-summary-delayed-update
+                   (while wl-summary-delayed-update
+                     (message "Parent (%d) of message %d is no entity"
+                              (caar wl-summary-delayed-update)
+                              (elmo-msgdb-overview-entity-get-number
+                               (cdar wl-summary-delayed-update)))
+                     (when (setq update-thread
+                                 (wl-summary-append-message-func-internal
+                                  (cdar wl-summary-delayed-update)
+                                  overview mark-alist (not sync-all) t))
+                       (wl-append update-top-list update-thread))
+                     (setq wl-summary-delayed-update
+                           (cdr wl-summary-delayed-update))))
+                 (when (and (eq wl-summary-buffer-view 'thread)
+                            update-top-list)
+                   (wl-thread-update-indent-string-thread
+                    (elmo-uniq-list update-top-list)))
+                 (message "Updating thread...done"))
+               (unless (eq wl-summary-buffer-view 'thread)
+                 (wl-summary-make-number-list))
+               (wl-summary-set-message-modified)
+               (wl-summary-set-mark-modified)
+               (when (and sync-all (eq wl-summary-buffer-view 'thread))
+                 (elmo-kill-buffer wl-summary-search-buf-name)
+                 (message "Inserting thread...")
+                 (setq wl-thread-entity-cur 0)
+                 (wl-thread-insert-top)
+                 (message "Inserting thread...done"))
+               (if elmo-use-database
+                   (elmo-database-close))
+               (run-hooks 'wl-summary-sync-updated-hook)
+               (setq mes
+                     (if (and (eq (length delete-list) 0)
+                              (eq num 0))
+                         (format
+                          "No updates for \"%s\"" (elmo-folder-name-internal
+                                                   folder))
+                       (format "Updated (-%d/+%d) message(s)"
+                               (length delete-list) num))))
+           (setq mes "Quit updating.")))
+      ;; synchronize marks.
+      (if (and wl-summary-auto-sync-marks sync-result)
+         (wl-summary-sync-marks))
+      ;; scoring
+      (when wl-use-scoring
+       (setq wl-summary-scored nil)
+       (wl-summary-score-headers nil (wl-summary-buffer-msgdb)
+                                 (and sync-all
+                                      (wl-summary-rescore-msgs number-alist))
+                                 sync-all)
+       (when (and wl-summary-scored
+                  (setq expunged (wl-summary-score-update-all-lines)))
+         (setq mes (concat mes
+                           (format " (%d expunged)"
+                                   (length expunged))))))
+      (if (and crossed (> crossed 0))
+         (setq mes
+               (if mes
+                   (concat mes
+                           (format " (%d crosspost)" crossed))
+                 (format "%d crosspost message(s)" crossed)))
+       (and mes (setq mes (concat mes "."))))
+      ;; Update Folder mode
+      (wl-folder-set-folder-updated
+       (elmo-folder-name-internal folder)
+       (list 0
+            (let ((pair (wl-summary-count-unread
+                         (elmo-msgdb-get-mark-alist
+                          (elmo-folder-msgdb folder)))))
+              (+ (car pair) (cdr pair)))
+            (elmo-folder-messages folder)))
+      (wl-summary-update-modeline)
+      (wl-summary-buffer-number-column-detect t)
+      ;;
+      (unless unset-cursor
+       (goto-char (point-min))
+       (if (not (wl-summary-cursor-down t))
+           (progn
+             (goto-char (point-max))
+             (forward-line -1))
+         (if (and wl-summary-highlight
+                  (not (get-text-property (point) 'face)))
+             (save-excursion
+               (forward-line (- 0
+                                (or
+                                 wl-summary-partial-highlight-above-lines
+                                 wl-summary-highlight-partial-threshold)))
+               (wl-highlight-summary (point) (point-max))))))
+      (setq wl-summary-buffer-msgdb (elmo-folder-msgdb folder))
+      (wl-delete-all-overlays)
+      (set-buffer-modified-p nil)
+      (if mes (message "%s" mes)))))
 
 (defun wl-summary-set-score-mark (mark)
   (save-excursion
@@ -2365,7 +2209,7 @@ If ARG is non-nil, checking is omitted."
          (buffer-read-only nil)
          msg-num
          cur-mark)
-      (when (looking-at "^ *\\([0-9]+\\)\\([^0-9]\\)")
+      (when (looking-at "^ *\\(-?[0-9]+\\)\\([^0-9]\\)")
        (setq msg-num  (string-to-int (wl-match-buffer 1)))
        (setq cur-mark (wl-match-buffer 2))
        (when (member cur-mark (list " "
@@ -2401,15 +2245,11 @@ If ARG is non-nil, checking is omitted."
                 (string-to-int
                  (read-from-minibuffer "Jump to Message(No.): ")))))
     (setq num (int-to-string num))
-    (if (re-search-forward (concat "^[ \t]*" num "[^0-9]") nil t)
-       (progn
-         (beginning-of-line)
-         t)
-      (if (re-search-backward (concat "^[ \t]*" num "[^0-9]") nil t)
-         (progn
-           (beginning-of-line)
-           t)
-       nil))))
+    (beginning-of-line)
+    (if (or (re-search-forward (concat "^[ \t]*" num "[^0-9]") nil t)
+           (re-search-backward (concat "^[ \t]*" num "[^0-9]") nil t))
+       (progn (beginning-of-line) t)
+      nil)))
 
 (defun wl-summary-highlight-msgs (msgs)
   (save-excursion
@@ -2432,75 +2272,39 @@ If ARG is non-nil, checking is omitted."
 (defun wl-summary-message-number ()
   (save-excursion
     (beginning-of-line)
-    (if (looking-at "^ *\\([0-9]+\\)")
+    (if (looking-at "^ *\\(-?[0-9]+\\)")
        (string-to-int (wl-match-buffer 1))
       nil)))
 
 (defun wl-summary-move (src dsts-msgs)
   (let* ((dsts (car dsts-msgs))                ; (+foo +bar)
 ;;;     (msgs (cdr dsts-msgs))         ; (1 2 3)
-;;;     (msgdb wl-summary-buffer-msgdb)
+;;;     (msgdb (wl-summary-buffer-msgdb))
 ;;;     result)
         )
     (while dsts
       (setq dsts (cdr dsts)))))
 
-(defun wl-summary-flush-pending-append-operations (&optional seen-list)
-  "Execute append operations that are done while offline status."
-  (when (and (elmo-folder-plugged-p wl-summary-buffer-folder-name)
-            elmo-enable-disconnected-operation)
-    (let* ((resumed-list (elmo-dop-append-list-load
-                         wl-summary-buffer-folder-name t))
-          (append-list (elmo-dop-append-list-load
-                        wl-summary-buffer-folder-name))
-          (appends (append resumed-list append-list))
-          (number-alist (elmo-msgdb-get-number-alist wl-summary-buffer-msgdb))
-          dels pair)
-      (when appends
-       (while appends
-         (if (setq pair (rassoc (car appends) number-alist))
-             (setq dels (append dels (list (car pair)))))
-         (setq appends (cdr appends)))
-       (when dels
-         (setq seen-list
-               (elmo-msgdb-add-msgs-to-seen-list-subr
-                dels
-                wl-summary-buffer-msgdb
-                (concat wl-summary-important-mark
-                        wl-summary-read-uncached-mark)
-                seen-list))
-         (message "Resuming summary status...")
-         (elmo-msgdb-delete-msgs wl-summary-buffer-folder-name
-                                 dels wl-summary-buffer-msgdb t)
-         (wl-summary-delete-messages-on-buffer dels)
-         (message "Resuming summary status...done"))
-       ;; delete resume-file
-       (elmo-dop-append-list-save wl-summary-buffer-folder-name nil t)
-       (when append-list
-         (elmo-dop-flush-pending-append-operations
-          wl-summary-buffer-folder-name append-list)))))
-  seen-list)
-
 (defun wl-summary-delete-all-msgs ()
   (interactive)
   (let ((cur-buf (current-buffer))
-       (dels (elmo-list-folder wl-summary-buffer-folder-name)))
+       (dels (elmo-folder-list-messages wl-summary-buffer-elmo-folder)))
     (set-buffer cur-buf)
     (if (null dels)
        (message "No message to delete.")
       (if (y-or-n-p (format "%s has %d message(s).  Delete all? "
-                           wl-summary-buffer-folder-name
+                           (wl-summary-buffer-folder-name)
                            (length dels)))
          (progn
            (message "Deleting...")
-           (elmo-delete-msgs wl-summary-buffer-folder-name dels
-                             wl-summary-buffer-msgdb)
-           (elmo-msgdb-delete-msgs wl-summary-buffer-folder-name
-                                   dels wl-summary-buffer-msgdb)
-;;;        (elmo-msgdb-save wl-summary-buffer-folder-name nil)
+           (elmo-folder-delete-messages
+            wl-summary-buffer-elmo-folder dels)
+           (elmo-msgdb-delete-msgs (wl-summary-buffer-msgdb)
+                                   dels)
+;;;        (elmo-msgdb-save (wl-summary-buffer-folder-name) nil)
            (wl-summary-set-message-modified)
            (wl-summary-set-mark-modified)
-           (wl-folder-set-folder-updated wl-summary-buffer-folder-name
+           (wl-folder-set-folder-updated (wl-summary-buffer-folder-name)
                                          (list 0 0 0))
 ;;; for thread.
 ;;;        (setq wl-thread-top-entity '(nil t nil nil))
@@ -2563,14 +2367,17 @@ If ARG, without confirm."
                (wl-folder-get-entity-id entity))))
   (wl-summary-goto-folder-subr wl-summary-last-visited-folder nil nil nil t))
 
-(defun wl-summary-sticky-p (&optional fld)
-  (if fld
-      (get-buffer (wl-summary-sticky-buffer-name fld))
+(defun wl-summary-sticky-p (&optional folder)
+  (if folder
+      (get-buffer (wl-summary-sticky-buffer-name
+                  (elmo-folder-name-internal folder)))
     (not (string= wl-summary-buffer-name (buffer-name)))))
 
-(defun wl-summary-always-sticky-folder-p (fld)
+(defun wl-summary-always-sticky-folder-p (folder)
   (or (eq t wl-summary-always-sticky-folder-list)
-      (wl-string-match-member fld wl-summary-always-sticky-folder-list)))
+      (wl-string-match-member
+       (elmo-folder-name-internal folder)
+       wl-summary-always-sticky-folder-list)))
 
 (defun wl-summary-stick (&optional force)
   "Make current summary buffer sticky."
@@ -2581,29 +2388,32 @@ If ARG, without confirm."
       (wl-summary-toggle-disp-msg 'off)
       (wl-summary-switch-to-clone-buffer
        (wl-summary-sticky-buffer-name
-       wl-summary-buffer-folder-name))
+       (wl-summary-buffer-folder-name)))
 ;;; ???hang up
 ;;;   (rename-buffer (wl-summary-sticky-buffer-name
-;;;                  wl-summary-buffer-folder-name)))
-      (message "Folder `%s' is now sticky." wl-summary-buffer-folder-name))))
+;;;                  (wl-summary-buffer-folder-name))))
+      (message "Folder `%s' is now sticky." (wl-summary-buffer-folder-name)))))
 
 (defun wl-summary-switch-to-clone-buffer (buffer-name)
   (let ((cur-buf (current-buffer))
        (msg (wl-summary-message-number))
        (buf (get-buffer-create buffer-name))
-       (folder wl-summary-buffer-folder-name)
+       (folder wl-summary-buffer-elmo-folder)
        (copy-variables
         (append '(wl-summary-buffer-view
                   wl-summary-buffer-refile-list
                   wl-summary-buffer-delete-list
                   wl-summary-buffer-copy-list
                   wl-summary-buffer-target-mark-list
-                  wl-summary-buffer-msgdb
+                  wl-summary-buffer-elmo-folder
                   wl-summary-buffer-number-column
                   wl-summary-buffer-number-regexp
                   wl-summary-buffer-message-modified
                   wl-summary-buffer-mark-modified
-                  wl-summary-buffer-thread-modified)
+                  wl-summary-buffer-thread-modified
+                  wl-summary-buffer-number-list
+                  wl-summary-buffer-msgdb
+                  wl-summary-buffer-folder-name)
                 (and (eq wl-summary-buffer-view 'thread)
                      '(wl-thread-entity-hashtb
                        wl-thread-entities
@@ -2612,7 +2422,7 @@ If ARG, without confirm."
                      '(wl-summary-scored
                        wl-summary-default-score
                        wl-summary-important-above
-                       wl-summary-temp-above
+                       wl-summary-target-above
                        wl-summary-mark-below
                        wl-summary-expunge-below))
                 (and (featurep 'wl-score)
@@ -2633,7 +2443,7 @@ If ARG, without confirm."
     (switch-to-buffer buf)
     (kill-buffer cur-buf)
     (wl-summary-count-unread
-     (elmo-msgdb-get-mark-alist wl-summary-buffer-msgdb))
+     (elmo-msgdb-get-mark-alist (wl-summary-buffer-msgdb)))
     (wl-summary-update-modeline)
     (if msg
        (if (eq wl-summary-buffer-view 'thread)
@@ -2647,60 +2457,66 @@ If ARG, without confirm."
           (get-buffer (wl-summary-sticky-buffer-name folder)))
       (get-buffer wl-summary-buffer-name)))
 
-(defun wl-summary-get-buffer-create (folder &optional force-sticky)
+(defun wl-summary-get-buffer-create (name &optional force-sticky)
   (if force-sticky
       (get-buffer-create
-       (wl-summary-sticky-buffer-name folder))
-    (or (get-buffer (wl-summary-sticky-buffer-name folder))
+       (wl-summary-sticky-buffer-name name))
+    (or (get-buffer (wl-summary-sticky-buffer-name name))
        (get-buffer-create wl-summary-buffer-name))))
 
-(defun wl-summary-disp-msg (folder disp-msg)
-  (let (disp mes-win)
-    (if (and disp-msg
-            wl-summary-buffer-disp-msg)
-       (let ((view-message-buffer (get-buffer wl-message-buf-name))
-             (number (wl-summary-message-number))
-             cur-folder cur-number sel-win)
-         (when view-message-buffer
-           (save-excursion
-             (set-buffer view-message-buffer)
-             (setq cur-folder wl-message-buffer-cur-folder
-                   cur-number wl-message-buffer-cur-number))
-           (when (and (string= folder cur-folder)
-                      (eq number cur-number))
-             (setq sel-win (selected-window))
-             (wl-select-buffer view-message-buffer)
-             (select-window sel-win)
-             (setq disp t)))))
-    (if (not disp)
-       (setq wl-summary-buffer-disp-msg nil))
-    (when (and (not disp)
-              (setq mes-win (wl-message-buffer-window)))
-      (delete-window mes-win)
-      (run-hooks 'wl-summary-toggle-disp-off-hook))))
-
-(defun wl-summary-goto-folder-subr (&optional folder scan-type other-window
+(defun wl-summary-make-number-list ()
+  (setq wl-summary-buffer-number-list
+       (mapcar
+        (lambda (x) (elmo-msgdb-overview-entity-get-number x))
+        (elmo-msgdb-get-overview (wl-summary-buffer-msgdb)))))
+
+(defun wl-summary-auto-select-msg-p (unread-msg)
+  (and unread-msg
+       (not (string=
+            (cadr (assoc unread-msg
+                         (elmo-msgdb-get-mark-alist
+                          (wl-summary-buffer-msgdb))))
+            wl-summary-important-mark))))
+
+(defsubst wl-summary-open-folder (folder)
+  ;; Select folder
+  (let ((elmo-mime-charset wl-summary-buffer-mime-charset))
+    (unwind-protect
+       (elmo-folder-open folder 'load-msgdb)
+      ;; For compatibility
+      (setq wl-summary-buffer-msgdb (elmo-folder-msgdb folder))
+      (setq wl-summary-buffer-folder-name (elmo-folder-name-internal
+                                          folder)))))
+
+(defun wl-summary-goto-folder-subr (&optional name scan-type other-window
                                              sticky interactive scoring)
   "Display target folder on summary."
   (interactive)
   (let* ((keep-cursor (memq this-command
                            wl-summary-keep-cursor-command))
-        (fld (or folder (wl-summary-read-folder wl-default-folder)))
-        (cur-fld wl-summary-buffer-folder-name)
-        buf mes hilit reuse-buf
+        (name (or name (wl-summary-read-folder wl-default-folder)))
+        (cur-fld wl-summary-buffer-elmo-folder)
+        folder buf mes hilit reuse-buf
         retval entity)
-    (if (string= fld "")
-       (setq fld wl-default-folder))
-    (when (and (not (string= cur-fld fld)) ; folder is moved.
+    (if (string= name "")
+       (setq name wl-default-folder))
+    (setq folder (wl-folder-get-elmo-folder name))
+    (when (and (not (string=
+                    (and cur-fld (elmo-folder-name-internal cur-fld))
+                    (elmo-folder-name-internal folder))) ; folder is moved.
               (eq major-mode 'wl-summary-mode)) ; called in summary.
-      (setq wl-summary-last-visited-folder wl-summary-buffer-folder-name)
+      (setq wl-summary-last-visited-folder (wl-summary-buffer-folder-name))
+      (run-hooks 'wl-summary-exit-pre-hook)
       (wl-summary-cleanup-temp-marks (wl-summary-sticky-p))
-      (wl-summary-save-status 'keep)) ;; keep current buffer, anyway.
-    (setq buf (wl-summary-get-buffer-create fld sticky))
+      (wl-summary-save-view)
+      (elmo-folder-commit wl-summary-buffer-elmo-folder))
+    (setq buf (wl-summary-get-buffer-create (elmo-folder-name-internal folder)
+                                           sticky))
     (setq reuse-buf
          (save-excursion
            (set-buffer buf)
-           (string= fld wl-summary-buffer-folder-name)))
+           (string= (elmo-folder-name-internal folder)
+                    (wl-summary-buffer-folder-name))))
     (unwind-protect
        (if reuse-buf
            (if interactive
@@ -2711,7 +2527,7 @@ If ARG, without confirm."
          (set-buffer buf)
          (unless (eq major-mode 'wl-summary-mode)
            (wl-summary-mode))
-         (wl-summary-buffer-set-folder fld)
+         (wl-summary-buffer-set-folder folder)
          (setq wl-summary-buffer-disp-msg nil)
          (setq wl-summary-buffer-last-displayed-msg nil)
          (setq wl-summary-buffer-current-msg nil)
@@ -2719,14 +2535,13 @@ If ARG, without confirm."
                (inhibit-read-only t)
                (buffer-read-only nil))
            (erase-buffer)
-           ;; resume summary cache
+           ;; Resume summary view
            (if wl-summary-cache-use
-               (let* ((dir (elmo-msgdb-expand-path fld))
+               (let* ((dir (elmo-folder-msgdb-path folder))
                       (cache (expand-file-name wl-summary-cache-file dir))
                       (view (expand-file-name wl-summary-view-file dir)))
                  (when (file-exists-p cache)
-                   (as-binary-input-file
-                    (insert-file-contents cache))
+                   (insert-file-contents-as-binary cache)
                    (elmo-set-buffer-multibyte
                     default-enable-multibyte-characters)
                    (decode-mime-charset-region
@@ -2735,22 +2550,23 @@ If ARG, without confirm."
                  (when (file-exists-p view)
                    (setq wl-summary-buffer-view
                          (wl-summary-load-file-object view)))
-                 (if (eq wl-summary-buffer-view 'thread)
-                     (wl-thread-resume-entity fld))))
-           ;; Load msgdb
-           (setq wl-summary-buffer-msgdb nil) ; new msgdb
-           (setq wl-summary-buffer-msgdb
-                 (wl-summary-msgdb-load-async fld))
-           (if (null wl-summary-buffer-msgdb)
-               (setq wl-summary-buffer-msgdb
-                     (elmo-msgdb-load (elmo-string fld))))
+                 (wl-thread-resume-entity folder)
+                 (wl-summary-open-folder folder))
+             (setq wl-summary-buffer-view
+                   (wl-summary-load-file-object
+                    (expand-file-name wl-summary-view-file
+                                      (elmo-folder-msgdb-path folder))))
+             (wl-summary-open-folder folder)
+             (wl-summary-rescan))
            (wl-summary-count-unread
-            (elmo-msgdb-get-mark-alist wl-summary-buffer-msgdb))
+            (elmo-msgdb-get-mark-alist (wl-summary-buffer-msgdb)))
            (wl-summary-update-modeline)))
+      (unless (eq wl-summary-buffer-view 'thread)
+       (wl-summary-make-number-list))
       (wl-summary-buffer-number-column-detect t)
-      (wl-summary-disp-msg fld (and reuse-buf keep-cursor))
+      (wl-summary-toggle-disp-msg (if wl-summary-buffer-disp-msg 'on 'off))
       (unless (and reuse-buf keep-cursor)
-       (setq hilit wl-summary-highlight)
+       ;(setq hilit wl-summary-highlight)
        (unwind-protect
            (let ((wl-summary-highlight (if reuse-buf wl-summary-highlight))
                  (wl-use-scoring
@@ -2758,7 +2574,7 @@ If ARG, without confirm."
              (if (and (not scan-type)
                       interactive
                       (not wl-ask-range))
-                 (setq scan-type (wl-summary-get-sync-range fld)))
+                 (setq scan-type (wl-summary-get-sync-range folder)))
              (cond
               ((eq scan-type nil)
                (wl-summary-sync 'unset-cursor))
@@ -2767,32 +2583,37 @@ If ARG, without confirm."
               ((eq scan-type 'no-sync))
               ((or (eq scan-type 'force-update)
                    (eq scan-type 'update))
-               (setq mes (wl-summary-sync-force-update 'unset-cursor)))))
+               (setq mes (wl-summary-sync-force-update
+                          'unset-cursor 'no-check)))))
          (if interactive
              (switch-to-buffer buf)
            (set-buffer buf))
          ;; stick always-sticky-folder
-         (when (wl-summary-always-sticky-folder-p fld)
+         (when (wl-summary-always-sticky-folder-p folder)
            (or (wl-summary-sticky-p) (wl-summary-stick t)))
          (run-hooks 'wl-summary-prepared-pre-hook)
          (set-buffer-modified-p nil)
          (goto-char (point-min))
          (if (wl-summary-cursor-down t)
-             (let ((unreadp (wl-thread-next-mark-p
-                             (wl-thread-entity-get-mark
-                              (wl-summary-message-number))
-                             wl-summary-move-order)))
-               (cond ((and wl-auto-select-first unreadp)
+             (let ((unreadp (wl-summary-next-message
+                             (wl-summary-message-number)
+                             'down t)))
+               (cond ((and wl-auto-select-first
+                           (wl-summary-auto-select-msg-p unreadp))
+                      ;; wl-auto-select-first is non-nil and
+                      ;; unreadp is non-nil but not important
                       (setq retval 'disp-msg))
-                     ((not unreadp)
+                     ((not (wl-summary-auto-select-msg-p unreadp))
+                      ;; unreadp is nil or important
                       (setq retval 'more-next))))
            (goto-char (point-max))
            (if (elmo-folder-plugged-p folder)
                (forward-line -1)
              (wl-summary-prev))
            (setq retval 'more-next))
-         (setq wl-summary-highlight hilit)
+         ;(setq wl-summary-highlight hilit)
          (if (and wl-summary-highlight
+                  (not wl-summary-lazy-highlight)
                   (not reuse-buf))
              (if (and wl-summary-highlight-partial-threshold
                       (> (count-lines (point-min) (point-max))
@@ -2805,9 +2626,6 @@ If ARG, without confirm."
                                    wl-summary-highlight-partial-threshold)))
                    (wl-highlight-summary (point) (point-max)))
                (wl-highlight-summary (point-min) (point-max))))
-         (if (null wl-summary-buffer-msgdb) ;; one more try.
-             (setq wl-summary-buffer-msgdb
-                   (elmo-msgdb-load (elmo-string fld))))
          (if (eq retval 'disp-msg)
              (wl-summary-redisplay))
          (if mes (message "%s" mes))
@@ -2816,7 +2634,8 @@ If ARG, without confirm."
     ;; set current entity-id
     (if (and (not folder)
             (setq entity
-                  (wl-folder-search-entity-by-name fld
+                  (wl-folder-search-entity-by-name (elmo-folder-name-internal
+                                                    folder)
                                                    wl-folder-entity
                                                    'folder)))
        ;; entity-id is unknown.
@@ -2885,7 +2704,7 @@ If ARG, without confirm."
     (error (ding)
           (message "Error in wl-summary-line-inserted-hook"))))
 
-(defun wl-summary-insert-summary (entity database mark-alist dummy &optional dummy)
+(defun wl-summary-insert-summary (entity database mark-alist dummy &optional dumm)
   (let ((overview-entity entity)
        summary-line msg)
     (setq msg (elmo-msgdb-overview-entity-get-number entity))
@@ -2899,7 +2718,7 @@ If ARG, without confirm."
 
 (defun wl-summary-default-subject-filter (subject)
   (let ((case-fold-search t))
-    (setq subject (elmo-replace-in-string subject "[ \t]*\\(re\\|was\\):" ""))
+    (setq subject (elmo-replace-in-string subject "[ \t]*\\(re\\|was\\)[:>]" ""))
     (setq subject (elmo-replace-in-string subject "[ \t]" ""))
     (elmo-replace-in-string subject "^\\[.*\\]" "")))
 
@@ -2944,15 +2763,15 @@ If ARG, without confirm."
     (run-hooks 'wl-summary-insert-headers-hook)))
 
 (defun wl-summary-search-by-subject (entity overview)
-  (let ((buf (get-buffer-create wl-summary-search-buf-name))
-       (folder-name wl-summary-buffer-folder-name)
+  (let ((summary-buf (current-buffer))
+       (buf (get-buffer-create wl-summary-search-buf-name))
+       (folder-name (wl-summary-buffer-folder-name))
        match founds found-entity)
-    (save-excursion
-      (set-buffer buf)
+    (with-current-buffer buf
       (let ((case-fold-search t))
-       (when (or (not (string= wl-summary-buffer-folder-name folder-name))
+       (when (or (not (string= wl-summary-search-buf-folder-name folder-name))
                  (zerop (buffer-size)))
-         (setq wl-summary-buffer-folder-name folder-name)
+         (setq wl-summary-search-buf-folder-name folder-name)
          (wl-summary-insert-headers
           overview
           (function
@@ -2964,23 +2783,26 @@ If ARG, without confirm."
                     (elmo-msgdb-overview-entity-get-subject entity)))
        (if (string= match "")
            (setq match "\n"))
-       (goto-char (point-max))
+       (goto-char (point-min))
        (while (and (not founds)
-                   (not (= (point) (point-min)))
-                   (search-backward match nil t))
+                   (not (= (point) (point-max)))
+                   (search-forward match nil t))
          ;; check exactly match
-         (when (and (bolp)
-                    (= (point-at-eol)
-                       (match-end 0)))
+         (when (and (eolp)
+                    (= (point-at-bol)
+                       (match-beginning 0)))
            (setq found-entity (wl-summary-get-alike))
            (if (and found-entity
                     ;; Is founded entity myself or children?
                     (not (string=
                           (elmo-msgdb-overview-entity-get-id entity)
-                          (elmo-msgdb-overview-entity-get-id (car found-entity))))
-                    (not (wl-thread-descendant-p
-                          (elmo-msgdb-overview-entity-get-number entity)
-                          (elmo-msgdb-overview-entity-get-number (car found-entity)))))
+                          (elmo-msgdb-overview-entity-get-id
+                           (car found-entity))))
+                    (with-current-buffer summary-buf
+                      (not (wl-thread-descendant-p
+                            (elmo-msgdb-overview-entity-get-number entity)
+                            (elmo-msgdb-overview-entity-get-number
+                             (car found-entity))))))
                ;; return matching entity
                (setq founds found-entity))))
        (if founds
@@ -3009,8 +2831,9 @@ If ARG, without confirm."
          ;; Search parent by subject.
          (when (and (null parent-number)
                     wl-summary-search-parent-by-subject-regexp
-                    (string-match wl-summary-search-parent-by-subject-regexp
-                                  (elmo-msgdb-overview-entity-get-subject entity)))
+                    (string-match
+                     wl-summary-search-parent-by-subject-regexp
+                     (elmo-msgdb-overview-entity-get-subject entity)))
            (let ((found (wl-summary-search-by-subject entity overview)))
              (when (and found
                         (not (member found wl-summary-delayed-update)))
@@ -3083,8 +2906,8 @@ If ARG, without confirm."
     (let* (eol
          (inhibit-read-only t)
          (buffer-read-only nil)
-         (folder wl-summary-buffer-folder-name)
-         (msgdb wl-summary-buffer-msgdb)
+         (folder wl-summary-buffer-elmo-folder)
+         (msgdb (wl-summary-buffer-msgdb))
          (mark-alist (elmo-msgdb-get-mark-alist msgdb))
 ;;;      (number-alist (elmo-msgdb-get-number-alist msgdb))
          new-mark visible mark)
@@ -3109,7 +2932,7 @@ If ARG, without confirm."
              (re-search-forward
               (format (concat "^ *\\("
                               (if number (int-to-string number)
-                                "[0-9]+")
+                                "-?[0-9]+")
                               "\\)[^0-9]\\(%s\\|%s\\)")
                       wl-summary-read-uncached-mark
                       " ") eol t))
@@ -3120,14 +2943,14 @@ If ARG, without confirm."
              (setq new-mark (if (string= mark
                                          wl-summary-read-uncached-mark)
                                 wl-summary-unread-uncached-mark
-                              (if (elmo-use-cache-p folder number)
+                              (if (elmo-message-use-cache-p folder number)
                                   wl-summary-unread-mark
                                 wl-summary-unread-uncached-mark))))
            ;; server side mark
            (unless no-server-update
-             (unless (elmo-mark-as-unread folder (list number)
-                                          msgdb)
-               (error "Setting mark failed")))
+             (save-match-data
+               (unless (elmo-folder-unmark-read folder (list number))
+                 (error "Setting mark failed"))))
            (when visible
              (delete-region (match-beginning 2) (match-end 2))
              (insert new-mark))
@@ -3141,7 +2964,7 @@ If ARG, without confirm."
                    (+ 1 wl-summary-buffer-unread-count))
              (wl-summary-update-modeline)
              (wl-folder-update-unread
-              folder
+              (wl-summary-buffer-folder-name)
               (+ wl-summary-buffer-unread-count
                  wl-summary-buffer-new-count)))
            (wl-summary-set-mark-modified)
@@ -3182,8 +3005,8 @@ If optional argument NUMBER is specified, mark message specified by NUMBER."
   (save-excursion
     (let ((inhibit-read-only t)
          (buffer-read-only nil)
-          (buf (current-buffer))
-          sol eol rs re)
+         (buf (current-buffer))
+         sol eol rs re)
       (beginning-of-line)
       (setq sol (point))
       (end-of-line)
@@ -3266,15 +3089,13 @@ If optional argument NUMBER is specified, mark message specified by NUMBER."
       (message "No marks")
     (save-excursion
       (let ((del-fld (wl-summary-get-delete-folder
-                     wl-summary-buffer-folder-name))
+                     (wl-summary-buffer-folder-name)))
            (start (point))
            (unread-marks (list wl-summary-unread-cached-mark
                                wl-summary-unread-uncached-mark
                                wl-summary-new-mark))
            (refiles (append moves dels))
-           (refile-executed 0)
            (refile-failures 0)
-           (copy-executed 0)
            (copy-failures 0)
            (copy-len (length copies))
            refile-len
@@ -3294,25 +3115,25 @@ If optional argument NUMBER is specified, mark message specified by NUMBER."
              (wl-inverse-alist refiles wl-summary-buffer-refile-list))
        (goto-char start)               ; avoid moving cursor to
                                        ; the bottom line.
+       (when (> refile-len elmo-display-progress-threshold)
+         (elmo-progress-set 'elmo-folder-move-messages
+                            refile-len "Moving messages..."))
        (while dst-msgs
-;;;      (elmo-msgdb-add-msgs-to-seen-list
-;;;       (car (car dst-msgs))         ;dst-folder
-;;;       (cdr (car dst-msgs))         ;msgs
-;;;       wl-summary-buffer-msgdb
-;;;       (concat wl-summary-important-mark
-;;;               wl-summary-read-uncached-mark))
          (setq result nil)
          (condition-case nil
-             (setq result (elmo-move-msgs wl-summary-buffer-folder-name
-                                          (cdr (car dst-msgs))
-                                          (car (car dst-msgs))
-                                          wl-summary-buffer-msgdb
-                                          refile-len
-                                          refile-executed
-                                          (not (null (cdr dst-msgs)))
-                                          nil ; no-delete
-                                          nil ; same-number
-                                          unread-marks))
+             (setq result (elmo-folder-move-messages
+                           wl-summary-buffer-elmo-folder
+                           (cdr (car dst-msgs))
+                           (if (eq 'null (car (car dst-msgs)))
+                               'null
+                             (wl-folder-get-elmo-folder
+                              (car (car dst-msgs))))
+                           (wl-summary-buffer-msgdb)
+                           (not (null (cdr dst-msgs)))
+                           nil ; no-delete
+                           nil ; same-number
+                           unread-marks
+                           t))
            (error nil))
          (if result                    ; succeeded.
              (progn
@@ -3321,33 +3142,31 @@ If optional argument NUMBER is specified, mark message specified by NUMBER."
                ;; update refile-alist.
                (setq wl-summary-buffer-refile-list
                      (wl-delete-associations (cdr (car dst-msgs))
-                                            wl-summary-buffer-refile-list)))
+                                             wl-summary-buffer-refile-list)))
            (setq refile-failures
                  (+ refile-failures (length (cdr (car dst-msgs))))))
-         (setq refile-executed (+ refile-executed (length (cdr (car dst-msgs)))))
          (setq dst-msgs (cdr dst-msgs)))
+       (elmo-progress-clear 'elmo-folder-move-messages)
        ;; end refile
        ;; begin cOpy...
        (setq dst-msgs (wl-inverse-alist copies wl-summary-buffer-copy-list))
+       (when (> copy-len elmo-display-progress-threshold)
+         (elmo-progress-set 'elmo-folder-move-messages
+                            copy-len "Copying messages..."))
        (while dst-msgs
-;;;      (elmo-msgdb-add-msgs-to-seen-list
-;;;       (car (car dst-msgs))         ;dst-folder
-;;;       (cdr (car dst-msgs))         ;msgs
-;;;       wl-summary-buffer-msgdb
-;;;       (concat wl-summary-important-mark
-;;;               wl-summary-read-uncached-mark))
          (setq result nil)
          (condition-case nil
-             (setq result (elmo-move-msgs wl-summary-buffer-folder-name
-                                          (cdr (car dst-msgs))
-                                          (car (car dst-msgs))
-                                          wl-summary-buffer-msgdb
-                                          copy-len
-                                          copy-executed
-                                          (not (null (cdr dst-msgs)))
-                                          t ; t is no-delete (copy)
-                                          nil ; same number
-                                          unread-marks))
+             (setq result (elmo-folder-move-messages
+                           wl-summary-buffer-elmo-folder
+                           (cdr (car dst-msgs))
+                           (wl-folder-get-elmo-folder
+                            (car (car dst-msgs)))
+                           (wl-summary-buffer-msgdb)
+                           (not (null (cdr dst-msgs)))
+                           t ; t is no-delete (copy)
+                           nil ; same number
+                           unread-marks
+                           t))
            (error nil))
          (if result                    ; succeeded.
              (progn
@@ -3359,13 +3178,19 @@ If optional argument NUMBER is specified, mark message specified by NUMBER."
                                              wl-summary-buffer-copy-list)))
            (setq copy-failures
                  (+ copy-failures (length (cdr (car dst-msgs))))))
-         (setq copy-executed (+ copy-executed (length (cdr (car dst-msgs)))))
          (setq dst-msgs (cdr dst-msgs)))
+       ;; Hide progress bar.
+       (elmo-progress-clear 'elmo-folder-move-messages)
        ;; end cOpy
        (wl-summary-folder-info-update)
        (wl-summary-set-message-modified)
        (wl-summary-set-mark-modified)
        (run-hooks 'wl-summary-exec-hook)
+       (unless (and wl-message-buffer
+                    (eq (wl-summary-message-number)
+                        (with-current-buffer wl-message-buffer
+                          wl-message-buffer-cur-number)))
+         (wl-summary-toggle-disp-msg 'off))
        (set-buffer-modified-p nil)
        (message (concat "Executing ... done"
                         (if (> refile-failures 0)
@@ -3381,7 +3206,7 @@ If optional argument NUMBER is specified, mark message specified by NUMBER."
   (let ((fld (completing-read
              (format "Folder name %s(%s): " (or purpose "")
                      default)
-             (or wl-folder-completion-func
+             (or wl-folder-completion-function
                  (if (memq 'read-folder wl-use-folder-petname)
                      (wl-folder-get-entity-with-petname)
                    wl-folder-entity-hashtb))
@@ -3392,11 +3217,16 @@ If optional argument NUMBER is specified, mark message specified by NUMBER."
        (setq fld default))
     (setq fld (elmo-string (wl-folder-get-realname fld)))
     (if (string-match "\n" fld)
-       (error "Not supported folder name: %s" fld))    
+       (error "Not supported folder name: %s" fld))
     (unless no-create
       (if ignore-error
-         (ignore-errors (wl-folder-confirm-existence fld))
-       (wl-folder-confirm-existence fld)))
+         (condition-case nil
+             (wl-folder-confirm-existence
+              (wl-folder-get-elmo-folder
+               fld))
+           (error))
+       (wl-folder-confirm-existence (wl-folder-get-elmo-folder
+                                     fld))))
     fld))
 
 (defun wl-summary-print-destination (msg-num folder)
@@ -3423,11 +3253,6 @@ If optional argument NUMBER is specified, mark message specified by NUMBER."
       (insert folder)
       (set-buffer-modified-p nil))))
 
-;; override.
-(when wl-on-nemacs
-  (defun wl-summary-print-destination (msg-num &optional folder))
-  (defun wl-summary-remove-destination ()))
-
 (defsubst wl-summary-get-mark (number)
   "Return a temporal mark of message specified by NUMBER."
   (or (and (memq number wl-summary-buffer-delete-list) "D")
@@ -3449,7 +3274,7 @@ If folder is read-only, message should be copied.
 See `wl-refile-policy-alist' for more details."
   (interactive)
   (let ((policy (wl-get-assoc-list-value wl-refile-policy-alist
-                                        wl-summary-buffer-folder-name)))
+                                        (wl-summary-buffer-folder-name))))
     (cond ((eq policy 'copy)
           (if (interactive-p)
               (call-interactively 'wl-summary-copy)
@@ -3466,16 +3291,14 @@ If optional argument NUMBER is specified, mark message specified by NUMBER."
   (wl-summary-refile-subr 'copy (interactive-p) dst number))
 
 (defun wl-summary-refile-subr (copy-or-refile interactive &optional dst number)
-  (interactive)
   (let* ((buffer-num (wl-summary-message-number))
         (msg-num (or number buffer-num))
         (msgid (and msg-num
-                    (cdr (assq msg-num
-                               (elmo-msgdb-get-number-alist
-                                wl-summary-buffer-msgdb)))))
+                    (elmo-message-field wl-summary-buffer-elmo-folder
+                                        msg-num 'message-id)))
         (entity (and msg-num
                      (elmo-msgdb-overview-get-entity
-                      msg-num wl-summary-buffer-msgdb)))
+                      msg-num (wl-summary-buffer-msgdb))))
         (variable
          (intern (format "wl-summary-buffer-%s-list" copy-or-refile)))
         folder mark already tmp-folder)
@@ -3499,8 +3322,9 @@ If optional argument NUMBER is specified, mark message specified by NUMBER."
                                 (or (wl-refile-guess entity) wl-trash-folder)
                                 (format "for %s" copy-or-refile)))))
       ;; Cache folder hack by okada@opaopa.org
-      (if (and (eq (car (elmo-folder-get-spec
-                        (wl-folder-get-realname folder))) 'cache)
+      (if (and (eq (elmo-folder-type-internal
+                   (wl-folder-get-elmo-folder
+                    (wl-folder-get-realname folder))) 'cache)
               (not (string= folder
                             (setq tmp-folder
                                   (concat "'cache/"
@@ -3509,14 +3333,8 @@ If optional argument NUMBER is specified, mark message specified by NUMBER."
          (progn
            (setq folder tmp-folder)
            (message "Force refile to %s." folder)))
-      (if (string= folder wl-summary-buffer-folder-name)
+      (if (string= folder (wl-summary-buffer-folder-name))
          (error "Same folder"))
-      (unless (or (elmo-folder-plugged-p wl-summary-buffer-folder-name)
-                 (and (eq (elmo-folder-get-type wl-summary-buffer-folder-name) 'pipe)
-                      (elmo-folder-plugged-p
-                       (elmo-pipe-spec-dst (elmo-folder-get-spec wl-summary-buffer-folder-name))))
-                 (elmo-cache-exists-p msgid))
-       (error "Unplugged (no cache or msgid)"))
       (if (or (string= folder wl-queue-folder)
              (string= folder wl-draft-folder))
          (error "Don't %s messages to %s" copy-or-refile folder))
@@ -3570,11 +3388,11 @@ If optional argument NUMBER is specified, mark message specified by NUMBER."
     (if (and (eq wl-summary-buffer-view 'thread)
             open-all)
        (wl-thread-open-all))
-    (let* ((spec wl-summary-buffer-folder-name)
+    (let* ((spec (wl-summary-buffer-folder-name))
           (overview (elmo-msgdb-get-overview
-                     wl-summary-buffer-msgdb))
+                     (wl-summary-buffer-msgdb)))
           (mark-alist (elmo-msgdb-get-mark-alist
-                       wl-summary-buffer-msgdb))
+                       (wl-summary-buffer-msgdb)))
           checked-dsts
           (count 0)
           number dst thr-entity)
@@ -3587,10 +3405,10 @@ If optional argument NUMBER is specified, mark message specified by NUMBER."
                         (wl-folder-get-realname
                          (wl-refile-guess-by-rule
                           (elmo-msgdb-overview-get-entity
-                           number wl-summary-buffer-msgdb))))
+                           number (wl-summary-buffer-msgdb)))))
                   (not (equal dst spec)))
          (when (not (member dst checked-dsts))
-           (wl-folder-confirm-existence dst)
+           (wl-folder-confirm-existence (wl-folder-get-elmo-folder dst))
            (setq checked-dsts (cons dst checked-dsts)))
          (if (wl-summary-refile dst number)
              (incf count))
@@ -3610,7 +3428,7 @@ If optional argument NUMBER is specified, mark message specified by NUMBER."
                  (when (and (setq dst
                                   (wl-refile-guess-by-rule
                                    (elmo-msgdb-overview-get-entity
-                                    (car messages) wl-summary-buffer-msgdb)))
+                                    (car messages) (wl-summary-buffer-msgdb))))
                             (not (equal dst spec)))
                    (if (wl-summary-refile dst (car messages))
                        (incf count))
@@ -3638,7 +3456,7 @@ If optional argument NUMBER is specified, unmark message specified by NUMBER."
        (setq visible t))
       ;; Delete mark on buffer.
       (when (and visible
-                (looking-at "^ *\\([0-9]+\\)\\([^0-9]\\)"))
+                (looking-at "^ *\\(-?[0-9]+\\)\\([^0-9]\\)"))
        (goto-char (match-end 2))
        (or number
            (setq number (string-to-int (wl-match-buffer 1))))
@@ -3720,10 +3538,10 @@ If optional argument NUMBER is specified, mark message specified by NUMBER."
       ;; guess by first msg
       (let* ((msgid (cdr (assq (wl-summary-message-number)
                               (elmo-msgdb-get-number-alist
-                               wl-summary-buffer-msgdb))))
+                               (wl-summary-buffer-msgdb)))))
             (function (intern (format "wl-summary-%s" copy-or-refile)))
             (entity (assoc msgid (elmo-msgdb-get-overview
-                                  wl-summary-buffer-msgdb)))
+                                  (wl-summary-buffer-msgdb))))
             folder)
        (if entity
            (setq folder (wl-summary-read-folder (wl-refile-guess entity)
@@ -3807,12 +3625,12 @@ If optional argument NUMBER is specified, mark message specified by NUMBER."
   (wl-summary-target-mark-region (point-min) (point-max))
   (setq wl-summary-buffer-target-mark-list
        (mapcar 'car
-               (elmo-msgdb-get-number-alist wl-summary-buffer-msgdb))))
+               (elmo-msgdb-get-number-alist (wl-summary-buffer-msgdb)))))
 
 (defun wl-summary-delete-all-mark (mark)
   (goto-char (point-min))
   (let ((case-fold-search nil))
-    (while (re-search-forward (format "^ *[0-9]+%s"
+    (while (re-search-forward (format "^ *-?[0-9]+%s"
                                      (regexp-quote mark)) nil t)
       (wl-summary-unmark))
     (cond ((string= mark "*")
@@ -3859,10 +3677,12 @@ If optional argument NUMBER is specified, mark message specified by NUMBER."
 
 (defun wl-summary-pick (&optional from-list delete-marks)
   (interactive)
-  (let ((result (elmo-msgdb-search
-                wl-summary-buffer-folder-name
-                (elmo-read-search-condition wl-summary-pick-field-default)
-                wl-summary-buffer-msgdb)))
+  (let* ((condition (car (elmo-parse-search-condition
+                         (elmo-read-search-condition
+                          wl-summary-pick-field-default))))
+        (result (elmo-folder-search wl-summary-buffer-elmo-folder
+                                    condition
+                                    from-list)))
     (if delete-marks
       (let ((mlist wl-summary-buffer-target-mark-list))
        (while mlist
@@ -3870,21 +3690,22 @@ If optional argument NUMBER is specified, mark message specified by NUMBER."
            (wl-summary-unmark))
          (setq mlist (cdr mlist)))
        (setq wl-summary-buffer-target-mark-list nil)))
-    (if from-list
-       (setq result (elmo-list-filter from-list result)))
-    (message "%d message(s) are picked." (length result))
-    (if (null result)
-       (message "No message was picked.")
-      (wl-summary-target-mark-msgs result))))
+    (if result
+       (progn
+         (wl-summary-target-mark-msgs result)
+         (message "%d message(s) are picked." (length result)))
+      (message "No message was picked."))))
 
 (defun wl-summary-unvirtual ()
   "Exit from current virtual folder."
   (interactive)
   (if (eq 'filter
-         (elmo-folder-get-type wl-summary-buffer-folder-name))
-      (wl-summary-goto-folder-subr (nth 2 (elmo-folder-get-spec
-                                          wl-summary-buffer-folder-name))
-                                  'update nil nil t)
+         (elmo-folder-type-internal wl-summary-buffer-elmo-folder))
+      (wl-summary-goto-folder-subr
+       (elmo-folder-name-internal
+       (elmo-filter-folder-target-internal
+        wl-summary-buffer-elmo-folder))
+       'update nil nil t)
     (error "This folder is not filtered")))
 
 (defun wl-summary-virtual (&optional arg)
@@ -3897,7 +3718,7 @@ If ARG, exit virtual folder."
                                         (elmo-read-search-condition
                                          wl-summary-pick-field-default)
                                         "/"
-                                        wl-summary-buffer-folder-name)
+                                        (wl-summary-buffer-folder-name))
                                 'update nil nil t)))
 
 (defun wl-summary-delete-all-temp-marks ()
@@ -3941,7 +3762,7 @@ If ARG, exit virtual folder."
          (buffer-read-only nil)
          msg-num
          cur-mark)
-      (when (looking-at "^ *\\([0-9]+\\)\\([^0-9]\\)")
+      (when (looking-at "^ *\\(-?[0-9]+\\)\\([^0-9]\\)")
        (setq msg-num  (string-to-int (wl-match-buffer 1)))
        (setq cur-mark (wl-match-buffer 2))
        (goto-char (match-end 1))
@@ -3972,8 +3793,8 @@ If ARG, exit virtual folder."
              (delq (car mlist) wl-summary-buffer-target-mark-list))
        (setq mlist (cdr mlist))))))
 
-(defun wl-summary-target-mark-prefetch ()
-  (interactive)
+(defun wl-summary-target-mark-prefetch (&optional ignore-cache)
+  (interactive "P")
   (save-excursion
     (let* ((mlist (nreverse wl-summary-buffer-target-mark-list))
           (inhibit-read-only t)
@@ -3984,7 +3805,7 @@ If ARG, exit virtual folder."
           skipped
           new-mark)
       (while mlist
-       (setq new-mark (wl-summary-prefetch-msg (car mlist)))
+       (setq new-mark (wl-summary-prefetch-msg (car mlist) ignore-cache))
        (if new-mark
            (progn
              (message "Prefetching... %d/%d message(s)"
@@ -3992,7 +3813,7 @@ If ARG, exit virtual folder."
              (when (wl-summary-jump-to-msg (car mlist))
                (wl-summary-unmark)
                (when new-mark
-                 (when (looking-at "^ *[0-9]+[^0-9]\\([^0-9]\\)")
+                 (when (looking-at "^ *-?[0-9]+[^0-9]\\([^0-9]\\)")
                    (delete-region (match-beginning 1) (match-end 1)))
                  (goto-char (match-beginning 1))
                  (insert new-mark)
@@ -4020,10 +3841,10 @@ If ARG, exit virtual folder."
       (when (re-search-forward regexp nil t)
        (setq msgid (cdr (assq (setq number (wl-summary-message-number))
                               (elmo-msgdb-get-number-alist
-                               wl-summary-buffer-msgdb)))
+                               (wl-summary-buffer-msgdb))))
              entity (assoc msgid
                            (elmo-msgdb-get-overview
-                            wl-summary-buffer-msgdb)))
+                            (wl-summary-buffer-msgdb))))
        (if (null entity)
            (error "Cannot %s" copy-or-refile))
        (funcall function
@@ -4084,7 +3905,7 @@ If ARG, exit virtual folder."
              (delq (car mlist) wl-summary-buffer-target-mark-list))
        (setq mlist (cdr mlist)))
       (wl-summary-count-unread
-       (elmo-msgdb-get-mark-alist wl-summary-buffer-msgdb))
+       (elmo-msgdb-get-mark-alist (wl-summary-buffer-msgdb)))
       (wl-summary-update-modeline))))
 
 (defun wl-summary-target-mark-mark-as-unread ()
@@ -4114,7 +3935,7 @@ If ARG, exit virtual folder."
              (delq (car mlist) wl-summary-buffer-target-mark-list))
        (setq mlist (cdr mlist)))
       (wl-summary-count-unread
-       (elmo-msgdb-get-mark-alist wl-summary-buffer-msgdb))
+       (elmo-msgdb-get-mark-alist (wl-summary-buffer-msgdb)))
       (wl-summary-update-modeline))))
 
 (defun wl-summary-target-mark-mark-as-important ()
@@ -4144,7 +3965,7 @@ If ARG, exit virtual folder."
              (delq (car mlist) wl-summary-buffer-target-mark-list))
        (setq mlist (cdr mlist)))
       (wl-summary-count-unread
-       (elmo-msgdb-get-mark-alist wl-summary-buffer-msgdb))
+       (elmo-msgdb-get-mark-alist (wl-summary-buffer-msgdb)))
       (wl-summary-update-modeline))))
 
 (defun wl-summary-target-mark-save ()
@@ -4152,7 +3973,8 @@ If ARG, exit virtual folder."
   (save-excursion
     (goto-char (point-min))
     (let ((wl-save-dir
-          (wl-read-directory-name "Save to directory: " wl-tmp-dir))
+          (wl-read-directory-name "Save to directory: "
+                                  wl-temporary-file-directory))
          (regexp (concat "^" wl-summary-buffer-number-regexp "\\(\\*\\)"))
          number mlist)
       (if (null (file-exists-p wl-save-dir))
@@ -4179,8 +4001,8 @@ If ARG, exit virtual folder."
     (let* (eol
           (inhibit-read-only t)
           (buffer-read-only nil)
-          (folder wl-summary-buffer-folder-name)
-          (msgdb wl-summary-buffer-msgdb)
+          (folder wl-summary-buffer-elmo-folder)
+          (msgdb (wl-summary-buffer-msgdb))
           (mark-alist (elmo-msgdb-get-mark-alist msgdb))
 ;;;       (number-alist (elmo-msgdb-get-number-alist msgdb))
           (case-fold-search nil)
@@ -4189,11 +4011,12 @@ If ARG, exit virtual folder."
          (progn
            (setq visible (wl-summary-jump-to-msg number))
            (setq mark (cadr (assq number mark-alist))))
+       ;; interactive
        (setq visible t))
       (beginning-of-line)
       (if (or (not visible)
              (looking-at
-              (format "^ *\\([0-9]+\\)[^0-9]\\(%s\\|%s\\|%s\\|%s\\).*$"
+              (format "^ *\\(-?[0-9]+\\)[^0-9]\\(%s\\|%s\\|%s\\|%s\\).*$"
                       (regexp-quote wl-summary-read-uncached-mark)
                       (regexp-quote wl-summary-unread-uncached-mark)
                       (regexp-quote wl-summary-unread-cached-mark)
@@ -4216,14 +4039,16 @@ If ARG, exit virtual folder."
            (setq number (or number (string-to-int (wl-match-buffer 1))))
            ;; set server side mark...
            (setq new-mark (if (and uncached
-                                   (if (elmo-use-cache-p folder number)
+                                   (if (elmo-message-use-cache-p folder number)
                                        (not (elmo-folder-local-p folder)))
                                    (not cached))
                               wl-summary-read-uncached-mark
                             nil))
            (if (not leave-server-side-mark-untouched)
-               (setq marked (elmo-mark-as-read folder
-                                               (list number) msgdb)))
+               (save-match-data
+                 (setq marked (elmo-folder-mark-as-read
+                               folder
+                               (list number)))))
            (if (or leave-server-side-mark-untouched
                    marked)
                (progn
@@ -4235,7 +4060,7 @@ If ARG, exit virtual folder."
                               (1- wl-summary-buffer-new-count))))
                  (wl-summary-update-modeline)
                  (wl-folder-update-unread
-                  folder
+                  (wl-summary-buffer-folder-name)
                   (+ wl-summary-buffer-unread-count
                      wl-summary-buffer-new-count))
                  (when (or stat cached)
@@ -4248,11 +4073,7 @@ If ARG, exit virtual folder."
                    (elmo-msgdb-set-mark-alist msgdb mark-alist)
                    (wl-summary-set-mark-modified))
                  (if (and visible wl-summary-highlight)
-                     (wl-highlight-summary-current-line nil nil t))
-                 (if (not notcrosses)
-                     (wl-summary-set-crosspost nil
-                                               (and wl-summary-buffer-disp-msg
-                                                    (interactive-p)))))
+                     (wl-highlight-summary-current-line nil nil t)))
              (if mark (message "Warning: Changing mark failed.")))))
       (set-buffer-modified-p nil)
       (if stat
@@ -4264,15 +4085,15 @@ If ARG, exit virtual folder."
                                               mark
                                               no-server-update)
   (interactive)
-  (if (eq (elmo-folder-get-type wl-summary-buffer-folder-name)
+  (if (eq (elmo-folder-type-internal wl-summary-buffer-elmo-folder)
          'internal)
       (error "Cannot process mark in this folder"))
   (save-excursion
     (let* (eol
          (inhibit-read-only t)
          (buffer-read-only nil)
-         (folder wl-summary-buffer-folder-name)
-         (msgdb wl-summary-buffer-msgdb)
+         (folder wl-summary-buffer-elmo-folder)
+         (msgdb (wl-summary-buffer-msgdb))
          (mark-alist (elmo-msgdb-get-mark-alist msgdb))
          (number-alist (elmo-msgdb-get-number-alist msgdb))
          message-id visible)
@@ -4282,7 +4103,7 @@ If ARG, exit virtual folder."
            (setq mark (or mark (cadr (assq number mark-alist)))))
        (setq visible t))
       (when visible
-       (if (null (wl-summary-message-number))
+       (if (null (setq number (wl-summary-message-number)))
            (progn
              (message "No message.")
              (setq visible nil))
@@ -4290,22 +4111,30 @@ If ARG, exit virtual folder."
          (setq eol (point))
          (re-search-backward (concat "^" wl-summary-buffer-number-regexp
                                      "..../..") nil t)) ; set cursor line
-       )
-      (beginning-of-line)
-      (if (re-search-forward "^ *\\([0-9]+\\)[^0-9]\\([^0-9]\\)" eol t)
+       (beginning-of-line))
+      (if (or (and (not visible)
+                  (assq number (elmo-msgdb-get-number-alist msgdb)))
+             (re-search-forward "^ *\\(-?[0-9]+\\)[^0-9]\\([^0-9]\\)" eol t))
          (progn
            (setq number (or number (string-to-int (wl-match-buffer 1))))
            (setq mark (or mark (wl-match-buffer 2)))
-           (setq message-id (cdr (assq number number-alist)))
+           (setq message-id (elmo-message-field
+                             wl-summary-buffer-elmo-folder
+                             number
+                             'message-id))
            (if (string= mark wl-summary-important-mark)
                (progn
                  ;; server side mark
-                 (unless no-server-update
-                   (elmo-unmark-important folder (list number) msgdb)
-                   (elmo-msgdb-global-mark-delete message-id))
-                 ;; Remove cache if local folder.
-                 (if (elmo-folder-local-p folder)
-                     (elmo-cache-delete message-id folder number))
+                 (save-match-data
+                   (unless no-server-update
+                     (elmo-folder-unmark-important folder (list number))
+                     (elmo-msgdb-global-mark-delete message-id))
+                   ;; Remove cache if local folder.
+                   (if (and (elmo-folder-local-p folder)
+                            (not (eq 'mark
+                                     (elmo-folder-type-internal folder))))
+                       (elmo-file-cache-delete
+                        (elmo-file-cache-get-path message-id))))
                  (when visible
                    (delete-region (match-beginning 2) (match-end 2))
                    (insert " "))
@@ -4314,20 +4143,20 @@ If ARG, exit virtual folder."
                                             number
                                             nil)))
              ;; server side mark
-             (unless no-server-update
-               (elmo-mark-as-important folder (list number) msgdb))
+             (save-match-data
+               (unless no-server-update
+                 (elmo-folder-mark-as-important folder (list number))))
              (when visible
                (delete-region (match-beginning 2) (match-end 2))
                (insert wl-summary-important-mark))
              (setq mark-alist
                    (elmo-msgdb-mark-set mark-alist
-                                        (string-to-int (wl-match-buffer 1))
+                                        number
                                         wl-summary-important-mark))
-             ;; Force cache message!!
-             (save-match-data
-               (unless (elmo-cache-exists-p message-id)
-                 (elmo-force-cache-msg folder number message-id
-                                       (elmo-msgdb-get-location msgdb))))
+             (if (elmo-file-cache-exists-p message-id)
+                 (elmo-folder-mark-as-read folder (list number))
+               ;; Force cache message.
+               (elmo-message-encache folder number 'read))
              (unless no-server-update
                (elmo-msgdb-global-mark-set message-id
                                            wl-summary-important-mark)))
@@ -4375,8 +4204,7 @@ If ARG, exit virtual folder."
       (setq linked (wl-thread-entity-get-linked thr-entity)))
     (if (string= thr-str "")
        (setq no-parent t)) ; no parent
-    (if (and wl-summary-width
-            wl-summary-indent-length-limit
+    (if (and wl-summary-indent-length-limit
             (< wl-summary-indent-length-limit
                (string-width thr-str)))
        (setq thr-str (wl-set-string-width
@@ -4385,8 +4213,8 @@ If ARG, exit virtual folder."
     (setq from
          (wl-set-string-width
           (if children-num
-              (- wl-from-width (length children-num) 2)
-            wl-from-width)
+              (- wl-summary-from-width (length children-num) 2)
+            wl-summary-from-width)
           (elmo-delete-char ?\n
                             (wl-summary-from-func-internal
                              (elmo-msgdb-overview-entity-get-from entity)))))
@@ -4428,8 +4256,8 @@ If ARG, exit virtual folder."
                                         subject parent-subject)))
                               (wl-summary-subject-func-internal subject) ""))
                     (if (and (not wl-summary-width)
-                             wl-subject-length-limit)
-                        (truncate-string subject wl-subject-length-limit)
+                             wl-summary-subject-length-limit)
+                        (truncate-string subject wl-summary-subject-length-limit)
                       subject)))))
     (if wl-summary-width (setq line
                               (wl-set-string-width
@@ -4448,11 +4276,12 @@ If ARG, exit virtual folder."
       (setq wl-summary-buffer-number-column
            (or
             (if (and update
-                     (setq end (if (re-search-forward "^ *[0-9]+[^0-9]" nil t)
+                     (setq end (if (re-search-forward
+                                    "^ *-?[0-9]+[^0-9]" nil t)
                                    (point))))
                 (- end (progn (beginning-of-line) (point)) 1))
             (wl-get-assoc-list-value wl-summary-number-column-alist
-                                     wl-summary-buffer-folder-name)
+                                     (wl-summary-buffer-folder-name))
             wl-summary-default-number-column))
       (setq wl-summary-buffer-number-regexp
            (wl-repeat-string "." wl-summary-buffer-number-column)))))
@@ -4463,111 +4292,90 @@ If ARG, exit virtual folder."
        (wl-match-string 1 wday-str)
       (elmo-date-get-week year month mday))))
 
-(defmacro wl-summary-cursor-move-regex ()
-  (` (let ((mark-alist
-           (if (elmo-folder-plugged-p wl-summary-buffer-folder-name)
-               (cond ((eq wl-summary-move-order 'new)
-                      (list
-                       (list
-                        wl-summary-new-mark)
-                       (list
-                        wl-summary-unread-uncached-mark
-                        wl-summary-unread-cached-mark
-                        wl-summary-important-mark)))
-                     ((eq wl-summary-move-order 'unread)
-                      (list
-                      (list
-                       wl-summary-unread-uncached-mark
-                       wl-summary-unread-cached-mark
-                       wl-summary-new-mark)
-                      (list
-                       wl-summary-important-mark)))
-                     (t
-                      (list
-                      (list
-                       wl-summary-unread-uncached-mark
-                       wl-summary-unread-cached-mark
-                       wl-summary-new-mark
-                       wl-summary-important-mark))))
-             (cond ((eq wl-summary-move-order 'unread)
-                    (list
-                    (list
-                     wl-summary-unread-cached-mark)
-                    (list
-                     wl-summary-important-mark)))
-                   (t
-                    (list
-                    (list
-                     wl-summary-unread-cached-mark
-                     wl-summary-important-mark)))))))
-       (mapcar
-       (function
-        (lambda (mark-list)
-          (concat wl-summary-message-regexp
-                  ".\\("
-                  (mapconcat 'regexp-quote
-                             mark-list
-                             "\\|")
-                  "\\)\\|"
-                  wl-summary-message-regexp "\\*")))
-       mark-alist))))
-
-;;
-;; Goto unread or important
-;;
-(defun wl-summary-cursor-up (&optional hereto)
-  (interactive "P")
-  (if (and (not wl-summary-buffer-target-mark-list)
-          (eq wl-summary-buffer-view 'thread))
-      (progn
-       (if (eobp)
-           (forward-line -1))
-       (wl-thread-jump-to-prev-unread hereto))
-    (if hereto
-       (end-of-line)
-      (beginning-of-line))
-    (let ((case-fold-search nil)
-         regex-list)
-      (setq regex-list (wl-summary-cursor-move-regex))
-      (catch 'done
-       (while regex-list
-         (when (re-search-backward
-                (car regex-list)
-                nil t nil)
-           (beginning-of-line)
-           (throw 'done t))
-         (setq regex-list (cdr regex-list)))
-       (beginning-of-line)
-       (throw 'done nil)))))
-
+(defvar wl-summary-move-spec-plugged-alist
+  (` ((new . ((t . nil)
+             (p . (, wl-summary-new-mark))
+             (p . (, (wl-regexp-opt
+                      (list wl-summary-unread-uncached-mark
+                            wl-summary-unread-cached-mark))))
+             (p . (, (regexp-quote wl-summary-important-mark)))))
+      (unread . ((t . nil)
+                (p . (, (wl-regexp-opt
+                         (list wl-summary-new-mark
+                               wl-summary-unread-uncached-mark
+                               wl-summary-unread-cached-mark))))
+                (p . (, (regexp-quote wl-summary-important-mark))))))))
+
+(defvar wl-summary-move-spec-unplugged-alist
+  (` ((new . ((t . nil)
+             (p . (, wl-summary-unread-cached-mark))
+             (p . (, (regexp-quote wl-summary-important-mark)))))
+      (unread . ((t . nil)
+                (p . (, wl-summary-unread-cached-mark))
+                (p . (, (regexp-quote wl-summary-important-mark))))))))
+
+(defsubst wl-summary-next-message (num direction hereto)
+  (if wl-summary-buffer-next-message-function
+      (funcall wl-summary-buffer-next-message-function num direction hereto)
+    (let ((cur-spec (cdr (assq wl-summary-move-order
+                              (if (elmo-folder-plugged-p
+                                   wl-summary-buffer-elmo-folder)
+                                  wl-summary-move-spec-plugged-alist
+                                wl-summary-move-spec-unplugged-alist))))
+         (nums (memq num (if (eq direction 'up)
+                             (reverse wl-summary-buffer-number-list)
+                           wl-summary-buffer-number-list)))
+         marked-list nums2)
+      (unless hereto (setq nums (cdr nums)))
+      (setq nums2 nums)
+      (if cur-spec
+         (catch 'done
+           (while cur-spec
+             (setq nums nums2)
+             (cond ((eq (car (car cur-spec)) 'p)
+                    (if (setq marked-list
+                              (elmo-folder-list-messages-mark-match
+                               wl-summary-buffer-elmo-folder
+                               (cdr (car cur-spec))))
+                        (while nums
+                          (if (memq (car nums) marked-list)
+                              (throw 'done (car nums)))
+                          (setq nums (cdr nums)))))
+                   ((eq (car (car cur-spec)) 't)
+                    (if wl-summary-buffer-target-mark-list
+                        (while nums
+                          (if (memq (car nums)
+                                    wl-summary-buffer-target-mark-list)
+                              (throw 'done (car nums)))
+                          (setq nums (cdr nums))))))
+             (setq cur-spec (cdr cur-spec))))
+       (car nums)))))
+
+(defsubst wl-summary-cursor-move (direction hereto)
+  (when (and (eq direction 'up)
+            (eobp))
+    (forward-line -1)
+    (setq hereto t))
+  (let (num)
+    (when (setq num (wl-summary-next-message (wl-summary-message-number)
+                                            direction hereto))
+      (if (numberp num)
+         (wl-thread-jump-to-msg num))
+      t)))
 ;;
 ;; Goto unread or important
 ;; returns t if next message exists in this folder.
 (defun wl-summary-cursor-down (&optional hereto)
   (interactive "P")
-  (if (and (null wl-summary-buffer-target-mark-list)
-          (eq wl-summary-buffer-view 'thread))
-      (wl-thread-jump-to-next-unread hereto)
-    (if hereto
-       (beginning-of-line)
-      (end-of-line))
-    (let ((case-fold-search nil)
-         regex-list)
-      (setq regex-list (wl-summary-cursor-move-regex))
-      (catch 'done
-       (while regex-list
-         (when (re-search-forward
-                (car regex-list)
-                nil t nil)
-           (beginning-of-line)
-           (throw 'done t))
-         (setq regex-list (cdr regex-list)))
-       (beginning-of-line)
-       (throw 'done nil)))))
+  (wl-summary-cursor-move 'down hereto))
+
+(defun wl-summary-cursor-up (&optional hereto)
+  (interactive "P")
+  (wl-summary-cursor-move 'up hereto))
 
 (defun wl-summary-save-view-cache ()
   (save-excursion
-    (let* ((dir (elmo-msgdb-expand-path wl-summary-buffer-folder-name))
+    (let* ((dir (elmo-folder-msgdb-path wl-summary-buffer-elmo-folder))
           (cache (expand-file-name wl-summary-cache-file dir))
           (view (expand-file-name wl-summary-view-file dir))
           (save-view wl-summary-buffer-view)
@@ -4605,7 +4413,7 @@ If ARG, exit virtual folder."
               (elmo-folder-plugged-p folder)
               (wl-get-assoc-list-value
                wl-folder-sync-range-alist
-               folder))
+               (elmo-folder-name-internal folder)))
              wl-default-sync-range)))
 
 ;; redefined for wl-summary-sync-update
@@ -4613,6 +4421,7 @@ If ARG, exit virtual folder."
   "returns update or all or rescan."
   ;; for the case when parts are expanded in the bottom of the folder
   (let ((input-range-list '("update" "all" "rescan" "first:" "last:"
+                           "cache-status"
                            "no-sync" "rescan-noscore" "all-visible"))
        (default (or (wl-get-assoc-list-value
                      wl-folder-sync-range-alist
@@ -4630,10 +4439,9 @@ If ARG, exit virtual folder."
 
 (defun wl-summary-toggle-disp-folder (&optional arg)
   (interactive)
-  (let (fld-buf fld-win
-       (view-message-buffer (wl-message-get-buffer-create))
-       (cur-buf (current-buffer))
-       (summary-win (get-buffer-window (current-buffer))))
+  (let ((cur-buf (current-buffer))
+       (summary-win (get-buffer-window (current-buffer)))
+       fld-buf fld-win)
     (cond
      ((eq arg 'on)
       (setq wl-summary-buffer-disp-folder t)
@@ -4644,8 +4452,9 @@ If ARG, exit virtual folder."
      ((eq arg 'off)
       (setq wl-summary-buffer-disp-folder nil)
       ;; hide your wl-message window!
-      (wl-select-buffer view-message-buffer)
-      (delete-window)
+      (when (buffer-live-p wl-message-buffer)
+       (wl-message-select-buffer wl-message-buffer)
+       (delete-window))
       (select-window (get-buffer-window cur-buf))
       ;; display wl-folder window!!
       (if (setq fld-buf (get-buffer wl-folder-buffer-name))
@@ -4669,7 +4478,8 @@ If ARG, exit virtual folder."
            (setq wl-summary-buffer-disp-folder t)))
       (if (not wl-summary-buffer-disp-folder)
          ;; hide message window
-         (let ((mes-win (get-buffer-window view-message-buffer))
+         (let ((mes-win (and wl-message-buffer
+                             (get-buffer-window wl-message-buffer)))
                (wl-stay-folder-window t))
            (if mes-win (delete-window mes-win))
            ;; hide your folder window
@@ -4682,13 +4492,13 @@ If ARG, exit virtual folder."
            (run-hooks 'wl-summary-toggle-disp-folder-off-hook)
            ;; resume message window.
            (when mes-win
-             (wl-select-buffer view-message-buffer)
+             (wl-message-select-buffer wl-message-buffer)
              (run-hooks 'wl-summary-toggle-disp-folder-message-resumed-hook)
-             (select-window (get-buffer-window cur-buf)))
-           )
+             (select-window (get-buffer-window cur-buf))))
        ;; hide message window
-       (let ((mes-win (get-buffer-window view-message-buffer))
-             (wl-stay-folder-window t))
+       (let ((wl-stay-folder-window t)
+             (mes-win (and wl-message-buffer
+                           (get-buffer-window wl-message-buffer))))
          (if mes-win (delete-window mes-win))
          (select-window (get-buffer-window cur-buf))
          ;; display wl-folder window!!
@@ -4706,37 +4516,39 @@ If ARG, exit virtual folder."
          ;; resume message window.
          (run-hooks 'wl-summary-toggle-disp-folder-on-hook)
          (when mes-win
-           (wl-select-buffer view-message-buffer)
+           (wl-message-select-buffer wl-message-buffer)
            (run-hooks 'wl-summary-toggle-disp-folder-message-resumed-hook)
-           (select-window (get-buffer-window cur-buf))))
-       ))))
+           (select-window (get-buffer-window cur-buf))))))))
   (run-hooks 'wl-summary-toggle-disp-folder-hook))
 
 (defun wl-summary-toggle-disp-msg (&optional arg)
   (interactive)
-  (let (fld-buf fld-win
-       (view-message-buffer (wl-message-get-buffer-create))
-       (cur-buf (current-buffer))
+  (let ((cur-buf (current-buffer))
+       fld-buf fld-win
        summary-win)
     (cond
      ((eq arg 'on)
       (setq wl-summary-buffer-disp-msg t)
-      ;; hide your folder window
-      (if (and (not wl-stay-folder-window)
-              (setq fld-buf (get-buffer wl-folder-buffer-name)))
-         (if (setq fld-win (get-buffer-window fld-buf))
-             (delete-window fld-win))))
+      (save-excursion
+       ;; hide your folder window
+       (if (and (not wl-stay-folder-window)
+                (setq fld-buf (get-buffer wl-folder-buffer-name)))
+           (if (setq fld-win (get-buffer-window fld-buf))
+               (unless (one-window-p fld-win)
+                 (delete-window fld-win))))))
      ((eq arg 'off)
       (wl-delete-all-overlays)
       (setq wl-summary-buffer-disp-msg nil)
       (save-excursion
-        (wl-select-buffer view-message-buffer)
-        (delete-window)
-       (and (get-buffer-window cur-buf)
-            (select-window (get-buffer-window cur-buf)))
-        (run-hooks 'wl-summary-toggle-disp-off-hook)))
+       (when (buffer-live-p wl-message-buffer)
+         (wl-message-select-buffer wl-message-buffer)
+         (delete-window)
+         (and (get-buffer-window cur-buf)
+              (select-window (get-buffer-window cur-buf))))
+       (run-hooks 'wl-summary-toggle-disp-off-hook)))
      (t
-      (if (get-buffer-window view-message-buffer) ; already displayed
+      (if (and wl-message-buffer
+              (get-buffer-window wl-message-buffer)) ; already displayed
          (setq wl-summary-buffer-disp-msg nil)
        (setq wl-summary-buffer-disp-msg t))
       (if wl-summary-buffer-disp-msg
@@ -4749,7 +4561,7 @@ If ARG, exit virtual folder."
            (run-hooks 'wl-summary-toggle-disp-on-hook))
        (wl-delete-all-overlays)
        (save-excursion
-         (wl-select-buffer view-message-buffer)
+         (wl-message-select-buffer wl-message-buffer)
          (delete-window)
          (select-window (get-buffer-window cur-buf))
          (run-hooks 'wl-summary-toggle-disp-off-hook))
@@ -4757,6 +4569,7 @@ If ARG, exit virtual folder."
        )))))
 
 (defun wl-summary-next-line-content ()
+  "Show next line of the message."
   (interactive)
   (let ((cur-buf (current-buffer)))
     (wl-summary-toggle-disp-msg 'on)
@@ -4781,37 +4594,32 @@ If ARG, exit virtual folder."
   (wl-message-prev-page))
 
 (defsubst wl-summary-no-mime-p (folder)
-  (wl-string-match-member folder wl-summary-no-mime-folder-list))
-
-(defun wl-summary-set-message-buffer-or-redisplay (&optional ignore-original)
-  ;; if current message is not displayed, display it.
-  ;; return t if exists.
-  (let ((folder wl-summary-buffer-folder-name)
+  (wl-string-match-member (elmo-folder-name-internal folder)
+                         wl-summary-no-mime-folder-list))
+
+(defun wl-summary-set-message-buffer-or-redisplay (&rest args)
+  "Set message buffer.
+If message is not displayed yet, display it.
+Return t if message exists."
+  (let ((folder wl-summary-buffer-elmo-folder)
        (number (wl-summary-message-number))
-       cur-folder cur-number message-last-pos
-       (view-message-buffer (wl-message-get-buffer-create)))
-    (save-excursion
-      (set-buffer view-message-buffer)
-      (setq cur-folder wl-message-buffer-cur-folder)
-      (setq cur-number wl-message-buffer-cur-number))
-    (if (and (not ignore-original)
-            (not
-             (and (eq number (wl-message-original-buffer-number))
-                  (string= folder (wl-message-original-buffer-folder)))))
+       cur-folder cur-number message-last-pos)
+    (when (buffer-live-p wl-message-buffer)
+      (save-window-excursion
+       (wl-message-select-buffer wl-message-buffer)
+       (setq cur-folder wl-message-buffer-cur-folder)
+       (setq cur-number wl-message-buffer-cur-number)))
+    (if (and (string= (elmo-folder-name-internal folder) (or cur-folder ""))
+            (eq number (or cur-number 0)))
        (progn
-         (if (wl-summary-no-mime-p folder)
-             (wl-summary-redisplay-no-mime folder number)
-           (wl-summary-redisplay-internal folder number))
-         nil)
-      (if (and (string= folder (or cur-folder ""))
-              (eq number (or cur-number 0)))
-         (progn
-           (set-buffer view-message-buffer)
-           t)
-       (if (wl-summary-no-mime-p folder)
-           (wl-summary-redisplay-no-mime folder number)
-         (wl-summary-redisplay-internal folder number))
-       nil))))
+         (set-buffer wl-message-buffer)
+         t)
+      (if (wl-summary-no-mime-p folder)
+         (wl-summary-redisplay-no-mime folder number)
+       (wl-summary-redisplay-internal folder number))
+      (when (buffer-live-p wl-message-buffer)
+       (set-buffer wl-message-buffer))
+      nil)))
 
 (defun wl-summary-target-mark-forward (&optional arg)
   (interactive "P")
@@ -4853,11 +4661,12 @@ If ARG, exit virtual folder."
     (wl-summary-jump-to-msg (car mlist))
     (wl-summary-reply arg t)
     (goto-char (point-max))
-    (setq start-point (point))
+    (setq start-point (point-marker))
     (setq draft-buf (current-buffer))
     (save-window-excursion
       (while mlist
        (set-buffer summary-buf)
+       (delete-other-windows)
        (wl-summary-jump-to-msg (car mlist))
        (wl-summary-redisplay)
        (set-buffer draft-buf)
@@ -4881,13 +4690,13 @@ If ARG, exit virtual folder."
   (interactive)
   (let* ((original (wl-summary-message-number))
         (msgid (elmo-string (or id (read-from-minibuffer "Message-ID: "))))
-        (number-alist (elmo-msgdb-get-number-alist wl-summary-buffer-msgdb))
+        (number-alist (elmo-msgdb-get-number-alist (wl-summary-buffer-msgdb)))
         msg otherfld schar
         (errmsg
          (format "No message with id \"%s\" in the folder." msgid)))
     (if (setq msg (car (rassoc msgid number-alist)))
 ;;;    (wl-summary-jump-to-msg-internal
-;;;     wl-summary-buffer-folder-name msg 'no-sync)
+;;;     (wl-summary-buffer-folder-name) msg 'no-sync)
        (progn
          (wl-thread-jump-to-msg msg)
          t)
@@ -4902,10 +4711,11 @@ If ARG, exit virtual folder."
              t ; succeed.
            ;; Back to original.
            (wl-summary-jump-to-msg-internal
-            wl-summary-buffer-folder-name original 'no-sync))
+            (wl-summary-buffer-folder-name) original 'no-sync))
        (cond ((eq wl-summary-search-via-nntp 'confirm)
+              (require 'elmo-nntp)
               (message "Search message in nntp server \"%s\" <y/n/s(elect)>?"
-                       elmo-default-nntp-server)
+                       elmo-nntp-default-server)
               (setq schar (read-char))
               (cond ((eq schar ?y)
                      (wl-summary-jump-to-msg-by-message-id-via-nntp msgid))
@@ -4929,19 +4739,19 @@ If ARG, exit virtual folder."
         user server port type spec)
     (if server-spec
        (if (string-match "^-" server-spec)
-           (setq spec (elmo-nntp-get-spec server-spec)
-                 user (nth 2 spec)
-                 server (nth 3 spec)
-                 port (nth 4 spec)
-                 type (nth 5 spec))
+           (setq spec (wl-folder-get-elmo-folder server-spec)
+                 user (elmo-net-folder-user-internal spec)
+                 server (elmo-net-folder-server-internal spec)
+                 port (elmo-net-folder-port-internal spec)
+                 type (elmo-net-folder-stream-type-internal spec))
          (setq server server-spec)))
     (when (setq ret (elmo-nntp-get-newsgroup-by-msgid
                     msgid
-                    (or server elmo-default-nntp-server)
-                    (or user elmo-default-nntp-user)
-                    (or port elmo-default-nntp-port)
-                    (or type elmo-default-nntp-stream-type)))
-      (setq newsgroups (wl-parse-newsgroups ret))
+                    (or server elmo-nntp-default-server)
+                    (or user elmo-nntp-default-user)
+                    (or port elmo-nntp-default-port)
+                    (or type elmo-nntp-default-stream-type)))
+      (setq newsgroups (elmo-nntp-parse-newsgroups ret))
       (setq folder (concat "-" (car newsgroups)
                           (elmo-nntp-folder-postfix user server port type)))
       (catch 'found
@@ -4956,12 +4766,12 @@ If ARG, exit virtual folder."
     (if ret
        (wl-summary-jump-to-msg-internal folder nil 'update msgid)
       (message "No message id \"%s\" in nntp server \"%s\"."
-              msgid (or server elmo-default-nntp-server))
+              msgid (or server elmo-nntp-default-server))
       nil)))
 
 (defun wl-summary-jump-to-msg-internal (folder msg scan-type &optional msgid)
   (let (wl-auto-select-first entity)
-    (if (or (string= folder wl-summary-buffer-folder-name)
+    (if (or (string= folder (wl-summary-buffer-folder-name))
            (y-or-n-p
             (format
              "Message was found in the folder \"%s\". Jump to it? "
@@ -4974,7 +4784,7 @@ If ARG, exit virtual folder."
                (setq msg
                      (car (rassoc msgid
                                   (elmo-msgdb-get-number-alist
-                                   wl-summary-buffer-msgdb)))))
+                                   (wl-summary-buffer-msgdb))))))
            (setq entity (wl-folder-search-entity-by-name folder
                                                          wl-folder-entity
                                                          'folder))
@@ -5063,32 +4873,32 @@ If ARG, exit virtual folder."
   "Reply to current message. Default is \"wide\" reply.
 Reply to author if invoked with ARG."
   (interactive "P")
-  (let ((folder wl-summary-buffer-folder-name)
+  (let ((folder wl-summary-buffer-elmo-folder)
        (number (wl-summary-message-number))
        (summary-buf (current-buffer))
        mes-buf)
-    (if number
-       (unwind-protect
-           (progn
-             (wl-summary-redisplay-internal folder number)
-             (wl-select-buffer
-              (get-buffer (setq mes-buf (wl-current-message-buffer))))
-             (set-buffer mes-buf)
-             (goto-char (point-min))
-             (or wl-draft-use-frame
-                 (split-window-vertically))
-             (other-window 1)
-             (when (setq mes-buf (wl-message-get-original-buffer))
-               (wl-draft-reply mes-buf arg summary-buf)
-               (unless without-setup-hook
-                 (run-hooks 'wl-mail-setup-hook)))
-             t)))))
+    (when number
+      (save-excursion
+       (wl-summary-redisplay-internal folder number))
+      (setq mes-buf wl-message-buffer)
+      (wl-message-select-buffer wl-message-buffer)
+      (set-buffer mes-buf)
+      (goto-char (point-min))
+      (unless wl-draft-use-frame
+       (split-window-vertically)
+       (other-window 1))
+      (when (setq mes-buf (wl-message-get-original-buffer))
+       (wl-draft-reply mes-buf arg summary-buf)
+       (unless without-setup-hook
+         (run-hooks 'wl-mail-setup-hook)))
+      t)))
 
 (defun wl-summary-write ()
   "Write a new draft from Summary."
   (interactive)
   (wl-draft nil nil nil nil nil
-           nil nil nil nil nil nil (current-buffer))
+           nil nil nil nil nil nil (current-buffer)
+           nil (wl-summary-buffer-folder-name))
   (run-hooks 'wl-mail-setup-hook)
   (mail-position-on-field "To"))
 
@@ -5097,64 +4907,69 @@ Reply to author if invoked with ARG."
     wl-folder-guess-mailing-list-by-refile-rule
     wl-folder-guess-mailing-list-by-folder-name)
   "Newsgroups or Mailing List address guess functions list.
-Call from `wl-summary-write-current-folder'")
+Call from `wl-summary-write-current-folder'.
+When guess function return nil, challenge next guess-function.")
 
 (defun wl-summary-write-current-folder (&optional folder)
   "Write message to current FOLDER's newsgroup or mailing-list.
 Use function list is `wl-summary-write-current-folder-functions'."
   (interactive)
-  (let (newsgroups to cc)
-    ;; default FOLDER is current buffer folder
-    (setq folder (or folder wl-summary-buffer-folder-name))
-    (let ((flist wl-summary-write-current-folder-functions)
-         guess-list)
-      (while flist
-       (setq guess-list (funcall (car flist) folder))
-       (if (or (nth 0 guess-list)      ; To:
-;;;            (nth 1 guess-list)      ; Cc:
-               (nth 2 guess-list))     ; Newsgroups:
-           (setq flist nil)
-         (setq flist (cdr flist))))
-      (if guess-list
-         (progn
-           (wl-draft (nth 0 guess-list) ; To:
-                     nil nil
-                     (nth 1 guess-list) ; Cc:
-                     nil               
-                     (nth 2 guess-list)) ; Newsgroups:
-           (run-hooks 'wl-mail-setup-hook))
-;;;    (error "%s is not newsgroup" folder)
-       (error "Can't guess by folder %s" folder)))))
+  ;; default FOLDER is current buffer folder
+  (setq folder (or folder (wl-summary-buffer-folder-name)))
+  (let ((func-list wl-summary-write-current-folder-functions)
+       guess-list guess-func)
+    (while func-list
+      (setq guess-list (funcall (car func-list) folder))
+      (if (null guess-list)
+         (setq func-list (cdr func-list))
+       (setq guess-func (car func-list))
+       (setq func-list nil)))
+    (when (null guess-func)
+      (error "Can't guess by folder %s" folder))
+    (unless (or (stringp (nth 0 guess-list))
+               (stringp (nth 1 guess-list))
+               (stringp (nth 2 guess-list)))
+      (error "Invalid value return guess function `%s'"
+            (symbol-name guess-func)))
+    (wl-draft (nth 0 guess-list) nil nil ; To:
+             (nth 1 guess-list) nil    ; Cc:
+             (nth 2 guess-list)        ; Newsgroups:
+             nil nil nil nil nil nil nil
+             folder)
+    (run-hooks 'wl-mail-setup-hook)
+    (mail-position-on-field "Subject")))
 
 (defun wl-summary-forward (&optional without-setup-hook)
   ""
   (interactive)
-  (let ((folder wl-summary-buffer-folder-name)
+  (let ((folder wl-summary-buffer-elmo-folder)
        (number (wl-summary-message-number))
        (summary-buf (current-buffer))
        (wl-draft-forward t)
+       mes-buf
        entity subject num)
     (if (null number)
        (message "No message.")
-      (wl-summary-redisplay-internal folder number)
-      (wl-select-buffer (get-buffer wl-message-buf-name))
-      (or wl-draft-use-frame
-         (split-window-vertically))
-      (other-window 1)
+      (if (and (elmo-message-use-cache-p folder number)
+              (eq (elmo-file-cache-status
+                   (elmo-file-cache-get
+                    (elmo-message-field folder number 'message-id)))
+                  'section))
+         ;; Reload.
+         (wl-summary-redisplay-internal nil nil 'force-reload)
+       (wl-summary-redisplay-internal folder number))
+      (setq mes-buf wl-message-buffer)
+      (wl-message-select-buffer mes-buf)
+      (unless wl-draft-use-frame
+       (split-window-vertically)
+       (other-window 1))
       ;; get original subject.
       (if summary-buf
          (save-excursion
            (set-buffer summary-buf)
-           (setq num (wl-summary-message-number))
-           (setq entity (assoc (cdr (assq num
-                                          (elmo-msgdb-get-number-alist
-                                           wl-summary-buffer-msgdb)))
-                               (elmo-msgdb-get-overview
-                                wl-summary-buffer-msgdb)))
-           (and entity
-                (setq subject
-                      (or (elmo-msgdb-overview-entity-get-subject entity)
-                          "")))))
+           (setq subject
+                 (or (elmo-message-field folder number 'subject) ""))))
+      (set-buffer mes-buf)
       (wl-draft-forward subject summary-buf)
       (unless without-setup-hook
        (run-hooks 'wl-mail-setup-hook)))))
@@ -5165,48 +4980,26 @@ Use function list is `wl-summary-write-current-folder-functions'."
   (wl-summary-read))
 
 (defun wl-summary-read ()
-  ""
+  "Proceed reading message in the summary buffer."
   (interactive)
-  (let ((folder wl-summary-buffer-folder-name)
-       (number (wl-summary-message-number))
-       cur-folder cur-number message-last-pos
-       (view-message-buffer (get-buffer-create wl-message-buf-name))
-        (sticky-buf-name (and (wl-summary-sticky-p) wl-message-buf-name))
-        (summary-buf-name (buffer-name)))
-    (save-excursion
-      (set-buffer view-message-buffer)
-      (when (and sticky-buf-name
-                 (not (wl-local-variable-p 'wl-message-buf-name
-                                          (current-buffer))))
-        (make-local-variable 'wl-message-buf-name)
-        (setq wl-message-buf-name sticky-buf-name)
-        (make-local-variable 'wl-message-buffer-cur-summary-buffer)
-        (setq wl-message-buffer-cur-summary-buffer summary-buf-name))
-      (setq cur-folder wl-message-buffer-cur-folder)
-      (setq cur-number wl-message-buffer-cur-number))
+  (let ((cur-buf (current-buffer)))
     (wl-summary-toggle-disp-msg 'on)
-    (if (and (string= folder cur-folder)
-            (eq number cur-number))
-       (progn
-         (if (wl-summary-next-page)
-             (wl-summary-down t)))
-;;;        (wl-summary-scroll-up-content)))
-      (if (wl-summary-no-mime-p folder)
-         (wl-summary-redisplay-no-mime folder number)
-       (wl-summary-redisplay-internal folder number)))))
+    (when (wl-summary-set-message-buffer-or-redisplay 'ignore-original)
+      (set-buffer cur-buf)
+      (if (wl-message-next-page)
+         (wl-summary-down t)))))
 
 (defun wl-summary-prev (&optional interactive)
   ""
   (interactive)
   (if wl-summary-move-direction-toggle
       (setq wl-summary-move-direction-downward nil))
-  (let ((type (elmo-folder-get-type wl-summary-buffer-folder-name))
-       (skip-mark-regexp (mapconcat
+  (let ((skip-mark-regexp (mapconcat
                           'regexp-quote
                           wl-summary-skip-mark-list ""))
        goto-next regex-list regex next-entity finfo)
     (beginning-of-line)
-    (if (elmo-folder-plugged-p wl-summary-buffer-folder-name)
+    (if (elmo-folder-plugged-p wl-summary-buffer-elmo-folder)
        (setq regex (format "^%s[^%s]"
                            wl-summary-buffer-number-regexp
                            skip-mark-regexp))
@@ -5223,8 +5016,8 @@ Use function list is `wl-summary-write-current-folder-functions'."
          (if wl-summary-buffer-disp-msg
              (wl-summary-redisplay)))
       (if (or interactive (interactive-p))
-         (if wl-summary-buffer-prev-folder-func
-             (funcall wl-summary-buffer-prev-folder-func)
+         (if wl-summary-buffer-prev-folder-function
+             (funcall wl-summary-buffer-prev-folder-function)
            (when wl-auto-select-next
              (setq next-entity (wl-summary-get-prev-folder))
              (if next-entity
@@ -5240,13 +5033,12 @@ Use function list is `wl-summary-write-current-folder-functions'."
   (interactive)
   (if wl-summary-move-direction-toggle
       (setq wl-summary-move-direction-downward t))
-  (let ((type (elmo-folder-get-type wl-summary-buffer-folder-name))
-       (skip-mark-regexp (mapconcat
+  (let ((skip-mark-regexp (mapconcat
                           'regexp-quote
                           wl-summary-skip-mark-list ""))
        goto-next regex regex-list next-entity finfo)
     (end-of-line)
-    (if (elmo-folder-plugged-p wl-summary-buffer-folder-name)
+    (if (elmo-folder-plugged-p wl-summary-buffer-elmo-folder)
        (setq regex (format "^%s[^%s]"
                            wl-summary-buffer-number-regexp
                            skip-mark-regexp))
@@ -5263,8 +5055,8 @@ Use function list is `wl-summary-write-current-folder-functions'."
        (if wl-summary-buffer-disp-msg
            (wl-summary-redisplay))
       (if (or interactive (interactive-p))
-         (if wl-summary-buffer-next-folder-func
-             (funcall wl-summary-buffer-next-folder-func)
+         (if wl-summary-buffer-next-folder-function
+             (funcall wl-summary-buffer-next-folder-function)
            (when wl-auto-select-next
              (setq next-entity (wl-summary-get-next-folder))
              (if next-entity
@@ -5285,8 +5077,8 @@ Use function list is `wl-summary-write-current-folder-functions'."
          (wl-summary-redisplay))
     (if (or interactive
            (interactive-p))
-       (if wl-summary-buffer-prev-folder-func
-           (funcall wl-summary-buffer-prev-folder-func)
+       (if wl-summary-buffer-prev-folder-function
+           (funcall wl-summary-buffer-prev-folder-function)
          (let (next-entity finfo)
            (when wl-auto-select-next
              (progn
@@ -5343,8 +5135,8 @@ Use function list is `wl-summary-write-current-folder-functions'."
          (wl-summary-redisplay))
     (if (or interactive
            (interactive-p))
-       (if wl-summary-buffer-next-folder-func
-           (funcall wl-summary-buffer-next-folder-func)
+       (if wl-summary-buffer-next-folder-function
+           (funcall wl-summary-buffer-next-folder-function)
          (let (next-entity finfo)
            (when wl-auto-select-next
              (setq next-entity (wl-summary-get-next-unread-folder)))
@@ -5374,19 +5166,17 @@ Use function list is `wl-summary-write-current-folder-functions'."
 (defun wl-summary-redisplay (&optional arg)
   (interactive "P")
   (if (and (not arg)
-          (wl-summary-no-mime-p wl-summary-buffer-folder-name))
+          (wl-summary-no-mime-p wl-summary-buffer-elmo-folder))
       (wl-summary-redisplay-no-mime)
     (wl-summary-redisplay-internal nil nil arg)))
 
 (defsubst wl-summary-redisplay-internal (&optional folder number force-reload)
   (interactive)
-  (let* ((msgdb wl-summary-buffer-msgdb)
-        (fld (or folder wl-summary-buffer-folder-name))
+  (let* ((msgdb (wl-summary-buffer-msgdb))
+        (folder (or folder wl-summary-buffer-elmo-folder))
         (num (or number (wl-summary-message-number)))
         (wl-mime-charset      wl-summary-buffer-mime-charset)
         (default-mime-charset wl-summary-buffer-mime-charset)
-        (wl-message-redisplay-func
-         wl-summary-buffer-message-redisplay-func)
         fld-buf fld-win thr-entity)
     (if (and wl-thread-open-reading-thread
             (eq wl-summary-buffer-view 'thread)
@@ -5405,42 +5195,51 @@ Use function list is `wl-summary-write-current-folder-functions'."
                   (setq fld-buf (get-buffer wl-folder-buffer-name)))
              (if (setq fld-win (get-buffer-window fld-buf))
                  (delete-window fld-win)))
-          (setq wl-current-summary-buffer (current-buffer))
-         (if (wl-message-redisplay fld num 'mime msgdb force-reload)
-             (wl-summary-mark-as-read nil
-                                      ;; cached, then change server-mark.
-                                      (if wl-message-cache-used
-                                          nil
-                                        ;; plugged, then leave server-mark.
-                                        (if (and
-                                             (not
-                                              (elmo-folder-local-p
-                                               wl-summary-buffer-folder-name))
-                                             (elmo-folder-plugged-p
-                                              wl-summary-buffer-folder-name))
-                                            'leave))
-                                      t ; displayed
-                                      nil
-                                      'cached ; cached by reading.
-                                      )
-           )
+         (setq wl-current-summary-buffer (current-buffer))
+         (wl-summary-mark-as-read
+          nil
+          ;; not fetched, then change server-mark.
+          (if (wl-message-redisplay folder num 'mime
+                                    (or force-reload
+                                        (string= (elmo-folder-name-internal
+                                                  folder)
+                                                 wl-draft-folder)))
+              nil
+            ;; plugged, then leave server-mark.
+            (if (and
+                 (not
+                  (elmo-folder-local-p
+                   wl-summary-buffer-elmo-folder))
+                 (elmo-folder-plugged-p
+                  wl-summary-buffer-elmo-folder))
+                'leave))
+          t ; displayed
+          nil
+          'cached ; cached by reading.
+          )
          (setq wl-summary-buffer-current-msg num)
          (when wl-summary-recenter
            (recenter (/ (- (window-height) 2) 2))
-           (if (not wl-summary-width)
+           (if (not wl-summary-indent-length-limit)
                (wl-horizontal-recenter)))
          (wl-highlight-summary-displaying)
-         (wl-cache-prefetch-next fld num (current-buffer))
+         (when wl-message-buffer-prefetch-depth
+           (if (not (< wl-message-buffer-prefetch-depth
+                       wl-message-buffer-cache-size))
+               (error (concat
+                       "`wl-message-buffer-prefetch-depth' must be smaller than "
+                       "`wl-message-buffer-cache-size' - 1.")))
+           (wl-message-buffer-prefetch-next folder num
+                                            wl-message-buffer-prefetch-depth
+                                            (current-buffer)
+                                            wl-summary-buffer-mime-charset))
          (run-hooks 'wl-summary-redisplay-hook))
       (message "No message to display."))))
 
 (defun wl-summary-redisplay-no-mime (&optional folder number)
   (interactive)
-  (let* ((msgdb wl-summary-buffer-msgdb)
-        (fld (or folder wl-summary-buffer-folder-name))
+  (let* ((fld (or folder wl-summary-buffer-elmo-folder))
         (num (or number (wl-summary-message-number)))
-        (wl-mime-charset      wl-summary-buffer-mime-charset)
-        (default-mime-charset wl-summary-buffer-mime-charset)
         wl-break-pages)
     (if num
        (progn
@@ -5448,12 +5247,14 @@ Use function list is `wl-summary-write-current-folder-functions'."
          (setq wl-summary-buffer-last-displayed-msg
                wl-summary-buffer-current-msg)
          (setq wl-current-summary-buffer (current-buffer))
-         (wl-normal-message-redisplay fld num 'no-mime msgdb)
+         (wl-message-redisplay fld num 'as-is
+                               (string= (elmo-folder-name-internal fld)
+                                        wl-draft-folder))
          (wl-summary-mark-as-read nil nil t)
          (setq wl-summary-buffer-current-msg num)
          (when wl-summary-recenter
            (recenter (/ (- (window-height) 2) 2))
-           (if (not wl-summary-width)
+           (if (not wl-summary-indent-length-limit)
                (wl-horizontal-recenter)))
          (wl-highlight-summary-displaying)
          (run-hooks 'wl-summary-redisplay-hook))
@@ -5463,24 +5264,24 @@ Use function list is `wl-summary-write-current-folder-functions'."
 
 (defun wl-summary-redisplay-all-header (&optional folder number)
   (interactive)
-  (let* ((msgdb wl-summary-buffer-msgdb)
-        (fld (or folder wl-summary-buffer-folder-name))
+  (let* ((fld (or folder wl-summary-buffer-elmo-folder))
         (num (or number (wl-summary-message-number)))
         (wl-mime-charset      wl-summary-buffer-mime-charset)
-        (default-mime-charset wl-summary-buffer-mime-charset)
-        (wl-message-redisplay-func wl-summary-buffer-message-redisplay-func))
+        (default-mime-charset wl-summary-buffer-mime-charset))
     (if num
        (progn
          (setq wl-summary-buffer-disp-msg t)
          (setq wl-summary-buffer-last-displayed-msg
                wl-summary-buffer-current-msg)
          (setq wl-current-summary-buffer (current-buffer))
-         (if (wl-message-redisplay fld num 'all-header msgdb); t if displayed.
+         (if (wl-message-redisplay fld num 'all-header
+                                   (string= (elmo-folder-name-internal fld)
+                                            wl-draft-folder))
              (wl-summary-mark-as-read nil nil t))
          (setq wl-summary-buffer-current-msg num)
          (when wl-summary-recenter
            (recenter (/ (- (window-height) 2) 2))
-           (if (not wl-summary-width)
+           (if (not wl-summary-indent-length-limit)
                (wl-horizontal-recenter)))
          (wl-highlight-summary-displaying)
          (run-hooks 'wl-summary-redisplay-hook))
@@ -5489,13 +5290,12 @@ Use function list is `wl-summary-write-current-folder-functions'."
 (defun wl-summary-jump-to-current-message ()
   (interactive)
   (let (message-buf message-win)
-    (if (setq message-buf (get-buffer wl-message-buf-name))
+    (if (setq message-buf wl-message-buffer)
        (if (setq message-win (get-buffer-window message-buf))
            (select-window message-win)
-         (wl-select-buffer (get-buffer wl-message-buf-name)))
+         (wl-message-select-buffer wl-message-buffer))
       (wl-summary-redisplay)
-      (wl-select-buffer (get-buffer wl-message-buf-name)))
-    (goto-char (point-min))))
+      (wl-message-select-buffer wl-message-buffer))))
 
 (defun wl-summary-cancel-message ()
   "Cancel an article on news."
@@ -5509,7 +5309,7 @@ Use function list is `wl-summary-write-current-folder-functions'."
          (set-buffer message-buf))
       (unless (wl-message-news-p)
        (set-buffer summary-buf)
-       (if (and (eq (elmo-folder-get-type wl-summary-buffer-folder-name)
+       (if (and (eq (elmo-folder-type-internal wl-summary-buffer-elmo-folder)
                     'nntp)
                 (y-or-n-p "Cannot get Newsgroups. Fetch again? "))
            (progn
@@ -5551,14 +5351,13 @@ Use function list is `wl-summary-write-current-folder-functions'."
   "Supersede current message."
   (interactive)
   (let ((summary-buf (current-buffer))
-       (mmelmo-force-fetch-entire-message t)
        message-buf from)
     (wl-summary-set-message-buffer-or-redisplay)
     (if (setq message-buf (wl-message-get-original-buffer))
        (set-buffer message-buf))
     (unless (wl-message-news-p)
       (set-buffer summary-buf)
-      (if (and (eq (elmo-folder-get-type wl-summary-buffer-folder-name)
+      (if (and (eq (elmo-folder-type-internal wl-summary-buffer-elmo-folder)
                   'nntp)
               (y-or-n-p "Cannot get Newsgroups. Fetch again? "))
          (progn
@@ -5579,16 +5378,15 @@ Use function list is `wl-summary-write-current-folder-functions'."
                      "Supersedes: " message-id "\n"
                      (and followup-to
                           (concat "Followup-To: " followup-to "\n")))))
-       (set-buffer (wl-message-get-original-buffer))
+    (if message-buf (set-buffer message-buf))
        (wl-draft-edit-string (buffer-substring (point-min) (point-max)))))))
 
 (defun wl-summary-save (&optional arg wl-save-dir)
   (interactive)
   (let ((filename)
-       (num (wl-summary-message-number))
-       (mmelmo-force-fetch-entire-message t))
+       (num (wl-summary-message-number)))
     (if (null wl-save-dir)
-       (setq wl-save-dir wl-tmp-dir))
+       (setq wl-save-dir wl-temporary-file-directory))
     (if num
        (save-excursion
          (setq filename (expand-file-name
@@ -5615,7 +5413,8 @@ Use function list is `wl-summary-write-current-folder-functions'."
       (narrow-to-region beg end)
       (goto-char (point-min))
       (let ((wl-save-dir
-            (wl-read-directory-name "Save to directory: " wl-tmp-dir)))
+            (wl-read-directory-name "Save to directory: "
+                                    wl-temporary-file-directory)))
        (if (null (file-exists-p wl-save-dir))
            (make-directory wl-save-dir))
        (if (eq wl-summary-buffer-view 'thread)
@@ -5661,13 +5460,10 @@ Use function list is `wl-summary-write-current-folder-functions'."
       (if (or (not (interactive-p))
              (y-or-n-p "Print ok? "))
          (progn
-           (let* ((message-buffer (get-buffer wl-message-buf-name))
-;;;               (summary-buffer (get-buffer wl-summary-buffer-name))
-                  (buffer (generate-new-buffer " *print*")))
-             (set-buffer message-buffer)
+           (let ((buffer (generate-new-buffer " *print*")))
              (copy-to-buffer buffer (point-min) (point-max))
              (set-buffer buffer)
-             (funcall wl-print-buffer-func)
+             (funcall wl-print-buffer-function)
              (kill-buffer buffer)))
        (message "")))))
 
@@ -5681,18 +5477,17 @@ Use function list is `wl-summary-write-current-folder-functions'."
        (let ((summary-buffer (current-buffer))
              wl-break-pages)
          (save-excursion
-;;;        (wl-summary-set-message-buffer-or-redisplay)
-           (wl-summary-redisplay-internal)
-           (let* ((message-buffer (get-buffer wl-message-buf-name))
-                  (buffer (generate-new-buffer " *print*"))
+           (wl-summary-set-message-buffer-or-redisplay)
+           ;; (wl-summary-redisplay-internal)
+           (let* ((buffer (generate-new-buffer " *print*"))
                   (entity (progn
                             (set-buffer summary-buffer)
                             (assoc (cdr (assq
                                          (wl-summary-message-number)
                                          (elmo-msgdb-get-number-alist
-                                          wl-summary-buffer-msgdb)))
+                                          (wl-summary-buffer-msgdb))))
                                    (elmo-msgdb-get-overview
-                                    wl-summary-buffer-msgdb))))
+                                    (wl-summary-buffer-msgdb)))))
                   (wl-ps-subject
                    (and entity
                         (or (elmo-msgdb-overview-entity-get-subject entity)
@@ -5704,7 +5499,7 @@ Use function list is `wl-summary-write-current-folder-functions'."
                    (and entity
                         (or (elmo-msgdb-overview-entity-get-date entity) ""))))
              (run-hooks 'wl-ps-preprint-hook)
-             (set-buffer message-buffer)
+             (set-buffer wl-message-buffer)
              (copy-to-buffer buffer (point-min) (point-max))
              (set-buffer buffer)
              (unwind-protect
@@ -5715,7 +5510,7 @@ Use function list is `wl-summary-write-current-folder-functions'."
                         (list "/pagenumberstring load"
                               (concat "(" wl-ps-date ")"))))
                    (run-hooks 'wl-ps-print-hook)
-                   (funcall wl-ps-print-buffer-func filename))
+                   (funcall wl-ps-print-buffer-function filename))
                (kill-buffer buffer)))))
       (message ""))))
 
@@ -5723,119 +5518,24 @@ Use function list is `wl-summary-write-current-folder-functions'."
     (fset 'wl-summary-print-message 'wl-summary-print-message-with-ps-print))
 
 (defun wl-summary-folder-info-update ()
-  (let ((folder (elmo-string wl-summary-buffer-folder-name))
+  (let ((folder (elmo-string (wl-summary-buffer-folder-name)))
        (num-db (elmo-msgdb-get-number-alist
-                wl-summary-buffer-msgdb)))
+                (wl-summary-buffer-msgdb))))
     (wl-folder-set-folder-updated folder
                                  (list 0
                                        (+ wl-summary-buffer-unread-count
                                           wl-summary-buffer-new-count)
                                        (length num-db)))))
 
-(defun wl-summary-get-newsgroups ()
-  (let ((spec-list (elmo-folder-get-primitive-spec-list
-                   (elmo-string wl-summary-buffer-folder-name)))
-       ng-list)
-    (while spec-list
-      (when (eq (caar spec-list) 'nntp)
-       (wl-append ng-list (list (nth 1 (car spec-list)))))
-      (setq spec-list (cdr spec-list)))
-    ng-list))
-
-(defun wl-summary-set-crosspost (&optional type redisplay)
-  (let* ((number (wl-summary-message-number))
-        (spec (elmo-folder-number-get-spec wl-summary-buffer-folder-name
-                                           number))
-        (folder (nth 1 spec))
-        message-buf newsgroups)
-    (when (eq (car spec) 'nntp)
-      (if redisplay
-         (wl-summary-redisplay))
-      (save-excursion
-       (if (setq message-buf (wl-message-get-original-buffer))
-           (set-buffer message-buf))
-       (setq newsgroups (std11-field-body "newsgroups")))
-      (when newsgroups
-       (let* ((msgdb wl-summary-buffer-msgdb)
-              (num-db (elmo-msgdb-get-number-alist msgdb))
-              (ng-list (wl-summary-get-newsgroups)) ;; for multi folder
-              crosspost-folders)
-         (when (setq crosspost-folders
-                     (elmo-list-delete ng-list
-                                       (wl-parse-newsgroups newsgroups t)))
-           (elmo-crosspost-message-set (cdr (assq number num-db)) ;;message-id
-                                       crosspost-folders
-                                       type) ;;not used
-           (setq wl-crosspost-alist-modified t)))))))
-
-(defun wl-summary-is-crosspost-folder (spec-list fld-list)
-  (let (fld flds)
-    (while spec-list
-      (if (and (eq (caar spec-list) 'nntp)
-              (member (setq fld (nth 1 (car spec-list))) fld-list))
-         (wl-append flds (list fld)))
-      (setq spec-list (cdr spec-list)))
-    flds))
-
-(defun wl-summary-update-crosspost ()
-  (let* ((msgdb wl-summary-buffer-msgdb)
-        (number-alist (elmo-msgdb-get-number-alist msgdb))
-        (mark-alist (elmo-msgdb-get-mark-alist msgdb))
-        (spec-list (elmo-folder-get-primitive-spec-list
-                    (elmo-string wl-summary-buffer-folder-name)))
-        (alist elmo-crosspost-message-alist)
-        (crossed 0)
-        mark ngs num)
-    (when (assq 'nntp spec-list)
-      (while alist
-       (when (setq ngs
-                   (wl-summary-is-crosspost-folder
-                    spec-list
-                    (nth 1 (car alist))))
-         (when (setq num (car (rassoc (caar alist) number-alist)))
-           (if (and (setq mark (cadr (assq num mark-alist)))
-                    (member mark (list wl-summary-new-mark
-                                       wl-summary-unread-uncached-mark
-                                       wl-summary-unread-cached-mark)))
-               (setq crossed (1+ crossed)))
-           (if (wl-summary-jump-to-msg num)
-               (wl-summary-mark-as-read t);; opened
-             (wl-summary-mark-as-read t nil nil num)));; closed
-         ;; delete if message does't exists.
-         (elmo-crosspost-message-delete (caar alist) ngs)
-         (setq wl-crosspost-alist-modified t))
-       (setq alist (cdr alist))))
-    (if (> crossed 0)
-       crossed)))
-
-(defun wl-crosspost-alist-load ()
-  (setq elmo-crosspost-message-alist (elmo-crosspost-alist-load))
-  (setq wl-crosspost-alist-modified nil))
-
-(defun wl-crosspost-alist-save ()
-  (when wl-crosspost-alist-modified
-    ;; delete non-exists newsgroups
-    (let ((alist elmo-crosspost-message-alist)
-         newsgroups)
-      (while alist
-       (setq newsgroups
-             (elmo-delete-if
-              '(lambda (x)
-                 (not (intern-soft x wl-folder-newsgroups-hashtb)))
-              (nth 1 (car alist))))
-       (if newsgroups
-           (setcar (cdar alist) newsgroups)
-         (setq elmo-crosspost-message-alist
-               (delete (car alist) elmo-crosspost-message-alist)))
-       (setq alist (cdr alist)))
-      (elmo-crosspost-alist-save elmo-crosspost-message-alist)
-      (setq wl-crosspost-alist-modified nil))))
+(defun wl-summary-get-original-buffer ()
+  "Get original buffer for the current summary."
+  (save-excursion
+    (wl-summary-set-message-buffer-or-redisplay)
+    (wl-message-get-original-buffer)))
 
 (defun wl-summary-pack-number (&optional arg)
   (interactive "P")
-  (setq wl-summary-buffer-msgdb
-       (elmo-pack-number
-        wl-summary-buffer-folder-name wl-summary-buffer-msgdb arg))
+  (elmo-folder-pack-numbers wl-summary-buffer-elmo-folder)
   (let (wl-use-scoring)
     (wl-summary-rescan)))
 
@@ -5854,7 +5554,7 @@ Use function list is `wl-summary-write-current-folder-functions'."
        (set-buffer summary-buf)
        (wl-summary-jump-to-msg (car mlist))
        (wl-summary-redisplay)
-       (set-buffer (setq orig-buf (wl-message-get-original-buffer)))
+       (set-buffer (setq orig-buf (wl-summary-get-original-buffer)))
        (goto-char (point-min))
        (cond ((= i 1) ; first
               (if (setq filename (wl-message-uu-substring
@@ -5871,15 +5571,15 @@ Use function list is `wl-summary-write-current-folder-functions'."
       (set-buffer tmp-buf)
       (message "Exec %s..." wl-prog-uudecode)
       (unwind-protect
-         (let ((decode-dir wl-tmp-dir))
+         (let ((decode-dir wl-temporary-file-directory))
            (if (not wl-prog-uudecode-no-stdout-option)
                (setq filename (read-file-name "Save to file: "
                                               (expand-file-name
                                                (elmo-safe-filename filename)
-                                               wl-tmp-dir)))
+                                               wl-temporary-file-directory)))
              (setq decode-dir
                    (wl-read-directory-name "Save to directory: "
-                                           wl-tmp-dir))
+                                           wl-temporary-file-directory))
              (setq filename (expand-file-name filename decode-dir)))
            (if (file-exists-p filename)
                (or (yes-or-no-p (format "File %s exists. Save anyway? "
@@ -5907,123 +5607,50 @@ Use function list is `wl-summary-write-current-folder-functions'."
                (message "Saved as %s" filename)))
        (kill-buffer tmp-buf)))))
 
-(defun wl-summary-drop-unsync ()
-  "Drop all unsync messages."
-  (interactive)
-  (if (elmo-folder-pipe-p wl-summary-buffer-folder-name)
-      (error "You cannot drop unsync messages in this folder"))
-  (if (or (not (interactive-p))
-         (y-or-n-p "Drop all unsync messages? "))
-      (let* ((folder-list (elmo-folder-get-primitive-folder-list
-                          wl-summary-buffer-folder-name))
-            (is-multi (elmo-multi-p wl-summary-buffer-folder-name))
-            (sum 0)
-            (multi-num 0)
-            pair)
-       (message "Dropping...")
-       (while folder-list
-         (setq pair (elmo-max-of-folder (car folder-list)))
-         (when is-multi ;; dirty hack...
-           (incf multi-num)
-           (setcar pair (+ (* multi-num elmo-multi-divide-number)
-                           (car pair))))
-         (elmo-msgdb-set-number-alist
-          wl-summary-buffer-msgdb
-          (nconc
-           (elmo-msgdb-get-number-alist wl-summary-buffer-msgdb)
-           (list (cons (car pair) nil))))
-         (setq sum (+ sum (cdr pair)))
-         (setq folder-list (cdr folder-list)))
-       (wl-summary-set-message-modified)
-       (wl-folder-set-folder-updated wl-summary-buffer-folder-name
-                                     (list 0
-                                           (+ wl-summary-buffer-unread-count
-                                              wl-summary-buffer-new-count)
-                                           sum))
-       (message "Dropping...done"))))
+;; Someday
+;; (defun wl-summary-drop-unsync ()
+;;   "Drop all unsync messages."
+;;   (interactive)
+;;   (if (elmo-folder-pipe-p (wl-summary-buffer-folder-name))
+;;       (error "You cannot drop unsync messages in this folder"))
+;;   (if (or (not (interactive-p))
+;;       (y-or-n-p "Drop all unsync messages? "))
+;;       (let* ((folder-list (elmo-folder-get-primitive-folder-list
+;;                        (wl-summary-buffer-folder-name)))
+;;          (is-multi (elmo-multi-p (wl-summary-buffer-folder-name)))
+;;          (sum 0)
+;;          (multi-num 0)
+;;          pair)
+;;     (message "Dropping...")
+;;     (while folder-list
+;;       (setq pair (elmo-folder-message-numbers (car folder-list)))
+;;       (when is-multi ;; dirty hack...
+;;         (incf multi-num)
+;;         (setcar pair (+ (* multi-num elmo-multi-divide-number)
+;;                         (car pair))))
+;;       (elmo-msgdb-set-number-alist
+;;        (wl-summary-buffer-msgdb)
+;;        (nconc
+;;         (elmo-msgdb-get-number-alist (wl-summary-buffer-msgdb))
+;;         (list (cons (car pair) nil))))
+;;       (setq sum (+ sum (cdr pair)))
+;;       (setq folder-list (cdr folder-list)))
+;;     (wl-summary-set-message-modified)
+;;     (wl-folder-set-folder-updated (wl-summary-buffer-folder-name)
+;;                                   (list 0
+;;                                         (+ wl-summary-buffer-unread-count
+;;                                            wl-summary-buffer-new-count)
+;;                                         sum))
+;;     (message "Dropping...done"))))
 
 (defun wl-summary-default-get-next-msg (msg)
-  (let (next)
-    (if (and (not wl-summary-buffer-target-mark-list)
-            (eq wl-summary-buffer-view 'thread)
-            (if (eq wl-summary-move-direction-downward nil)
-                (setq next (wl-thread-get-prev-unread msg))
-              (setq next (wl-thread-get-next-unread msg))))
-       next
-      (save-excursion
-       (wl-summary-jump-to-msg msg)
-       (let (wl-summary-buffer-disp-msg)
-         (if (eq wl-summary-move-direction-downward nil)
-             (unless (wl-summary-cursor-up)
-               (wl-summary-prev))
-           (unless (wl-summary-cursor-down)
-             (wl-summary-next)))
-         (wl-summary-message-number))))))
-
-(defsubst wl-cache-prefetch-p (fld &optional num)
-  (cond ((and num wl-cache-prefetch-folder-type-list)
-        (memq
-         (elmo-folder-number-get-type fld num)
-         wl-cache-prefetch-folder-type-list))
-       (wl-cache-prefetch-folder-type-list
-        (let ((list wl-cache-prefetch-folder-type-list)
-              type)
-          (catch 'done
-            (while (setq type (pop list))
-              (if (elmo-folder-contains-type fld type)
-                  (throw 'done t))))))
-       ((consp wl-cache-prefetch-folder-list)
-        (wl-string-match-member fld wl-cache-prefetch-folder-list))
-       (t
-        wl-cache-prefetch-folder-list)))
-
-(defconst wl-cache-prefetch-idle-time
-  (if (featurep 'lisp-float-type) (/ (float 1) (float 10)) 1))
-
-(defun wl-cache-prefetch-next (fld msg &optional summary)
-  (if (wl-cache-prefetch-p fld)
-      (if elmo-use-buffer-cache
-;;;      (message "`elmo-use-buffer-cache' is nil, cache prefetch is disable.")
-       (save-excursion
-         (set-buffer (or summary (get-buffer wl-summary-buffer-name)))
-         (let ((next (funcall wl-cache-prefetch-get-next-func msg)))
-           (when (and next
-                      (wl-cache-prefetch-p fld next))
-             (if (not (fboundp 'run-with-idle-timer))
-                 (when (sit-for wl-cache-prefetch-idle-time)
-                   (wl-cache-prefetch-message fld next summary))
-               (run-with-idle-timer
-                wl-cache-prefetch-idle-time
-                nil
-                'wl-cache-prefetch-message fld next summary)
-               (sit-for 0))))))))
-
-(defvar wl-cache-prefetch-debug nil)
-(defun wl-cache-prefetch-message (folder msg summary &optional next)
-  (when (buffer-live-p summary)
-    (save-excursion
-      (set-buffer summary)
-      (when (string= folder wl-summary-buffer-folder-name)
-       (unless next
-         (setq next msg))
-       (let* ((msgdb wl-summary-buffer-msgdb)
-              (message-id (cdr (assq next
-                                     (elmo-msgdb-get-number-alist msgdb)))))
-         (if (not (elmo-buffer-cache-hit (list folder next message-id)))
-             (let* ((size (elmo-msgdb-overview-entity-get-size
-                           (assoc message-id
-                                  (elmo-msgdb-get-overview msgdb)))))
-               (when (or (elmo-local-file-p folder next)
-                         (not (and (integerp size)
-                                   wl-cache-prefetch-threshold
-                                   (>= size wl-cache-prefetch-threshold)
-                                   (not (elmo-cache-exists-p message-id
-                                                             folder next)))))
-                 (if wl-cache-prefetch-debug
-                     (message "Reading %d..." msg))
-                 (elmo-buffer-cache-message folder next msgdb nil 'unread)
-                 (if wl-cache-prefetch-debug
-                     (message "Reading %d... done" msg))))))))))
+  (or (wl-summary-next-message msg
+                              (if wl-summary-move-direction-downward 'down
+                                'up)
+                              nil)
+      (cadr (memq msg (if wl-summary-move-direction-downward
+                         wl-summary-buffer-number-list
+                       (reverse wl-summary-buffer-number-list))))))
 
 (defun wl-summary-save-current-message ()
   "Save current message for `wl-summary-yank-saved-message'."