* elmo-imap4.el (elmo-imap4-folder-name-syntax): Allow numbers in
[elisp/wanderlust.git] / wl / wl-message.el
index 775758b..71748aa 100644 (file)
@@ -28,6 +28,8 @@
 
 ;;; Code:
 ;;
+(eval-when-compile (require 'cl))
+(eval-when-compile (require 'static))
 
 (require 'wl-vars)
 (require 'wl-highlight)
   'wl-summary-default-get-next-msg)
 
 (defvar wl-message-buffer-prefetch-debug nil)
-(defvar wl-message-buffer-prefetch-timer nil)
 
 (defvar wl-message-buffer nil) ; message buffer.
 
-(defvar wl-message-buffer-cur-summary-buffer nil)
 (defvar wl-message-buffer-cur-folder nil)
 (defvar wl-message-buffer-cur-number nil)
-(defvar wl-message-buffer-cur-flag nil)
+(defvar wl-message-buffer-cur-display-type nil)
 (defvar wl-message-buffer-cur-summary-buffer nil)
+(defvar wl-message-buffer-require-all-header nil)
 (defvar wl-message-buffer-original-buffer nil) ; original buffer.
-(defvar wl-message-buffer-all-header-flag nil)
+(defvar wl-message-buffer-mode-line-formatter nil)
+(defvar wl-message-buffer-flag-indicator nil)
+(defvar wl-message-buffer-mime-entity nil)
 
 (make-variable-buffer-local 'wl-message-buffer-cur-folder)
 (make-variable-buffer-local 'wl-message-buffer-cur-number)
-(make-variable-buffer-local 'wl-message-buffer-cur-flag)
+(make-variable-buffer-local 'wl-message-buffer-cur-display-type)
 (make-variable-buffer-local 'wl-message-buffer-cur-summary-buffer)
+(make-variable-buffer-local 'wl-message-buffer-require-all-header)
 (make-variable-buffer-local 'wl-message-buffer-original-buffer)
-(make-variable-buffer-local 'wl-message-buffer-all-header-flag)
+(make-variable-buffer-local 'wl-message-buffer-mode-line-formatter)
+(make-variable-buffer-local 'wl-message-buffer-flag-indicator)
+(make-variable-buffer-local 'wl-message-buffer-mime-entity)
 
 (defvar wl-fixed-window-configuration nil)
 
 With association ((\"folder\" message \"message-id\") . cache-buffer).")
 
 (defmacro wl-message-buffer-cache-buffer-get (entry)
-  (` (cdr (, entry))))
+  `(cdr ,entry))
 
 (defmacro wl-message-buffer-cache-folder-get (entry)
-  (` (car (car (, entry)))))
+  `(car (car ,entry)))
 
 (defmacro wl-message-buffer-cache-message-get (entry)
-  (` (cdr (car (, entry)))))
+  `(cdr (car ,entry)))
 
 (defmacro wl-message-buffer-cache-entry-make (key buf)
-  (` (cons (, key) (, buf))))
+  `(cons ,key ,buf))
 
 (defmacro wl-message-buffer-cache-hit (key)
   "Return value assosiated with key."
-  (` (wl-message-buffer-cache-buffer-get
-      (assoc (, key) wl-message-buffer-cache))))
+  `(wl-message-buffer-cache-buffer-get
+    (assoc ,key wl-message-buffer-cache)))
 
 (defun wl-message-buffer-cache-sort (entry)
   "Move ENTRY to the top of `wl-message-buffer-cache'."
   (setq wl-message-buffer-cache
        (cons entry (delete entry wl-message-buffer-cache))))
-;  (let* ((pointer (cons nil wl-message-buffer-cache))
-;       (top pointer))
-;    (while (cdr pointer)
-;      (if (equal (car (cdr pointer)) entry)
-;        (setcdr pointer (cdr (cdr pointer)))
-;      (setq pointer (cdr pointer))))
-;    (setcdr pointer (list entry))
-;    (setq wl-message-buffer-cache (cdr top))))
-
-(defconst wl-message-buffer-cache-name    " *WL:Message*")
+;;;  (let* ((pointer (cons nil wl-message-buffer-cache))
+;;;     (top pointer))
+;;;    (while (cdr pointer)
+;;;      (if (equal (car (cdr pointer)) entry)
+;;;      (setcdr pointer (cdr (cdr pointer)))
+;;;    (setq pointer (cdr pointer))))
+;;;    (setcdr pointer (list entry))
+;;;    (setq wl-message-buffer-cache (cdr top))))
+
 (defconst wl-original-message-buffer-name " *Original*")
 
 (defun wl-original-message-mode ()
   "A major mode for original message buffer."
   (setq major-mode 'wl-original-message-mode)
   (setq buffer-read-only t)
-  (elmo-set-buffer-multibyte nil)
+  (set-buffer-multibyte nil)
   (setq mode-name "Wanderlust original message"))
 
 (defun wl-original-message-buffer-get (name)
@@ -131,11 +136,14 @@ If original message buffer already exists, it is re-used."
 
 (defun wl-message-buffer-create ()
   "Create a new message buffer."
-  (let* ((buffer (generate-new-buffer wl-message-buffer-cache-name))
+  (let* ((buffer (generate-new-buffer wl-message-buffer-name))
         (name (buffer-name buffer)))
     (with-current-buffer buffer
       (setq wl-message-buffer-original-buffer
-           (wl-original-message-buffer-get name)))
+           (wl-original-message-buffer-get name))
+      (when wl-message-use-header-narrowing
+       (wl-message-header-narrowing-setup))
+      (run-hooks 'wl-message-buffer-created-hook))
     buffer))
 
 (defun wl-message-buffer-cache-add (key)
@@ -145,9 +153,12 @@ Return its cache buffer."
        (buf nil))
     (if (< len wl-message-buffer-cache-size)
        (setq buf (wl-message-buffer-create))
-      (setq buf (wl-message-buffer-cache-buffer-get
-                (nth (1- len) wl-message-buffer-cache)))
-      (setcdr (nthcdr (- len 2) wl-message-buffer-cache) nil))
+      (let ((entry (nth (1- len) wl-message-buffer-cache)))
+       (if (buffer-live-p
+            (setq buf (wl-message-buffer-cache-buffer-get entry)))
+           (setcdr (nthcdr (- len 2) wl-message-buffer-cache) nil)
+         (setq wl-message-buffer-cache (delq entry wl-message-buffer-cache))
+         (setq buf (wl-message-buffer-create)))))
     (setq wl-message-buffer-cache
          (cons (wl-message-buffer-cache-entry-make key buf)
                wl-message-buffer-cache))
@@ -172,7 +183,7 @@ Return its cache buffer."
           wl-message-buffer
           (get-buffer-window wl-message-buffer))
       (delete-window (get-buffer-window wl-message-buffer)))
-  (wl-kill-buffers (regexp-quote wl-message-buffer-cache-name))
+  (wl-kill-buffers (regexp-quote wl-message-buffer-name))
   (setq wl-message-buffer-cache nil))
 
 ;;; Message buffer handling from summary buffer.
@@ -197,8 +208,8 @@ Return its cache buffer."
        (mes (cdr wl-message-window-size))
        whi)
     (when (and window
-              (not (eq (save-excursion (set-buffer (window-buffer window))
-                                       wl-message-buffer-cur-summary-buffer)
+              (not (eq (with-current-buffer (window-buffer window)
+                         wl-message-buffer-cur-summary-buffer)
                        (current-buffer))))
       (delete-window window)
       (run-hooks 'wl-message-window-deleted-hook)
@@ -252,68 +263,64 @@ If ARG is specified, narrow to ARGth page."
   "Scroll down current message by LINES.
 Returns non-nil if top of message."
   (interactive)
-  (let (cur-buf top real-top)
-    (unless (eq major-mode 'mime-view-mode)
-      (when (buffer-live-p wl-message-buffer)
-       (setq cur-buf (current-buffer))
-       (wl-message-select-buffer wl-message-buffer)))
-    (move-to-window-line 0)
-    (if (and wl-break-pages
-            (bobp)
-            (not (setq real-top (save-restriction (widen) (bobp)))))
-       (progn
-         (wl-message-narrow-to-page -1)
-         (goto-char (point-max))
-         (recenter))
-      (if (not (bobp))
-         (condition-case nil
-             (scroll-down lines)
-           (error))
-       (setq top t)))
-    (if real-top
-       (let ((f (assq (mime-preview-original-major-mode)
-                      mime-preview-over-to-previous-method-alist)))
-         (if f (funcall (cdr f))))
-      (when cur-buf
-       (select-window (get-buffer-window cur-buf))))
+  (let (top real-top)
+    (save-selected-window
+      (unless (eq major-mode 'mime-view-mode)
+       (when (buffer-live-p wl-message-buffer)
+         (wl-message-select-buffer wl-message-buffer)))
+      (move-to-window-line 0)
+      (if (and wl-break-pages
+              (bobp)
+              (not (setq real-top (save-restriction (widen) (bobp)))))
+         (progn
+           (wl-message-narrow-to-page -1)
+           (goto-char (point-max))
+           (recenter))
+       (if (not (bobp))
+           (condition-case nil
+               (scroll-down (or lines wl-message-scroll-amount))
+             (error))
+         (setq top t)))
+      (if real-top
+         (let ((f (assq (mime-preview-original-major-mode)
+                        mime-preview-over-to-previous-method-alist)))
+           (if f (funcall (cdr f))))))
     top))
 
 (defun wl-message-next-page (&optional lines)
   "Scroll up current message by LINES.
 Returns non-nil if bottom of message."
   (interactive)
-  (let (cur-buf bottom)
-    (unless (eq major-mode 'mime-view-mode)
-      (when (buffer-live-p wl-message-buffer)
-       (setq cur-buf (current-buffer))
-       (wl-message-select-buffer wl-message-buffer)))
-    (move-to-window-line -1)
-    (if (save-excursion
-         (end-of-line)
-         (and (pos-visible-in-window-p)
-              (eobp)))
-       (if (or (null wl-break-pages)
-               (save-excursion
-                 (save-restriction
-                   (widen) (forward-line) (eobp))))
-           (setq bottom t)
-         (wl-message-narrow-to-page 1)
-         (setq bottom nil))
-      (condition-case ()
-         (static-if (boundp 'window-pixel-scroll-increment)
-             ;; XEmacs 21.2.20 and later.
-             (let (window-pixel-scroll-increment)
-               (scroll-up lines))
-           (scroll-up lines))
-       (end-of-buffer
-        (goto-char (point-max))))
-      (setq bottom nil))
-    (if (eobp)
-       (let ((f (assq (mime-preview-original-major-mode)
-                      mime-preview-over-to-next-method-alist)))
-         (if f (funcall (cdr f))))
-      (when cur-buf
-       (select-window (get-buffer-window cur-buf))))
+  (let (bottom)
+    (save-selected-window
+      (unless (eq major-mode 'mime-view-mode)
+       (when (buffer-live-p wl-message-buffer)
+         (wl-message-select-buffer wl-message-buffer)))
+      (move-to-window-line -1)
+      (if (save-excursion
+           (end-of-line)
+           (and (pos-visible-in-window-p)
+                (eobp)))
+         (if (or (null wl-break-pages)
+                 (save-excursion
+                   (save-restriction
+                     (widen) (forward-line) (eobp))))
+             (setq bottom t)
+           (wl-message-narrow-to-page 1)
+           (setq bottom nil))
+       (condition-case ()
+           (static-if (boundp 'window-pixel-scroll-increment)
+               ;; XEmacs 21.2.20 and later.
+               (let (window-pixel-scroll-increment)
+                 (scroll-up (or lines wl-message-scroll-amount)))
+             (scroll-up (or lines wl-message-scroll-amount)))
+         (end-of-buffer
+          (goto-char (point-max))))
+       (setq bottom nil))
+      (if (eobp)
+         (let ((f (assq (mime-preview-original-major-mode)
+                        mime-preview-over-to-next-method-alist)))
+           (if f (funcall (cdr f))))))
     bottom))
 
 
@@ -334,15 +341,22 @@ Returns non-nil if bottom of message."
   (setq mode-name "Message"))
 
 (defun wl-message-exit ()
-  "Move to summary buffer."
+  "Move to summary buffer or mother buffer."
   (interactive)
-  (let (summary-buf summary-win)
-    (if (setq summary-buf wl-message-buffer-cur-summary-buffer)
-       (if (setq summary-win (get-buffer-window summary-buf))
-           (select-window summary-win)
-         (switch-to-buffer summary-buf)
-         (wl-message-select-buffer wl-message-buffer)
-         (select-window (get-buffer-window summary-buf))))
+  (let (summary-buf summary-win mother-buffer)
+    (cond ((setq summary-buf wl-message-buffer-cur-summary-buffer)
+          (unless (buffer-live-p summary-buf)
+            (error "Summary buffer not found: %s"
+                   wl-message-buffer-cur-folder))
+          (if (setq summary-win (get-buffer-window summary-buf))
+              (select-window summary-win)
+            (switch-to-buffer summary-buf)
+            (wl-message-select-buffer wl-message-buffer)
+            (select-window (get-buffer-window summary-buf))))
+         ((setq mother-buffer mime-mother-buffer)
+          (kill-buffer (current-buffer))
+          (when (buffer-live-p mother-buffer)
+            (switch-to-buffer mother-buffer))))
     (run-hooks 'wl-message-exit-hook)))
 
 (defun wl-message-toggle-disp-summary ()
@@ -364,7 +378,9 @@ Returns non-nil if bottom of message."
 
 (defun wl-message-get-original-buffer ()
   "Get original buffer for current message buffer."
-  wl-message-buffer-original-buffer)
+  (if (buffer-live-p wl-message-buffer-original-buffer)
+      wl-message-buffer-original-buffer
+    (wl-original-message-buffer-get (buffer-name (current-buffer)))))
 
 (defun wl-message-add-buttons-to-body (start end)
   (save-excursion
@@ -409,22 +425,77 @@ Returns non-nil if bottom of message."
               (nth 3 entry) (match-string (nth 4 entry))))
            (goto-char end)))))))
 
-(defun wl-message-redisplay (folder number flag &optional force-reload)
+;; display-type object definition.
+(defun wl-message-make-display-type (mime header)
+  (let (symbol)
+    (prog1
+       (setq symbol (intern (format "%s-%s-header" mime header)))
+      (put symbol
+          'wl-message-display-type
+          (list :mime mime :header header)))))
+
+(defun wl-message-display-type-property (display-type prop)
+  (plist-get (get display-type 'wl-message-display-type) prop))
+
+(defun wl-message-mime-analysis-p (display-type &optional header-or-body)
+  (let ((mode (wl-message-display-type-property display-type :mime)))
+    (case header-or-body
+      (header
+       (memq mode '(mime header-only)))
+      (t
+       (eq mode 'mime)))))
+
+(defun wl-message-display-all-header-p (display-type)
+  (eq (wl-message-display-type-property display-type :header) 'all))
+
+(defun wl-message-display-no-merge-p (display-type)
+  (eq (wl-message-display-type-property display-type :mime) 'no-merge))
+
+(defun wl-message-buffer-display-type (&optional message-buffer)
+  (if message-buffer
+      (with-current-buffer message-buffer
+       wl-message-buffer-cur-display-type)
+    wl-message-buffer-cur-display-type))
+
+(defun wl-message-flag-indicator (flags)
+  (let ((flags (elmo-get-global-flags flags)))
+    (if (null flags)
+       ""
+      (concat
+       " ("
+       (mapconcat
+       (lambda (flag)
+         (let ((indicator (capitalize (symbol-name flag)))
+               face)
+           (when (and (assq flag wl-summary-flag-alist)
+                      (facep
+                       (setq face (intern
+                                   (format "wl-highlight-summary-%s-flag-face"
+                                           flag)))))
+             (put-text-property 0 (length indicator) 'face face indicator))
+           indicator))
+       (sort flags
+             (lambda (l r)
+               (> (length (memq (assq l wl-summary-flag-alist)
+                                wl-summary-flag-alist))
+                  (length (memq (assq r wl-summary-flag-alist)
+                                wl-summary-flag-alist)))))
+       ", ")
+       ")"))))
+
+(defun wl-message-redisplay (folder number display-type &optional force-reload)
   (let* ((default-mime-charset wl-mime-charset)
         (buffer-read-only nil)
         (summary-buf (current-buffer))
-        message-buf
-        strategy entity
-        cache-used
-        header-end real-fld-num summary-win delim)
+        message-buf entity summary-win flags)
     (setq buffer-read-only nil)
-    (setq cache-used (wl-message-buffer-display
-                     folder number flag force-reload))
-    (setq wl-message-buffer (car cache-used))
+    (setq wl-message-buffer (wl-message-buffer-display
+                            folder number display-type force-reload))
     (setq message-buf wl-message-buffer)
     (wl-message-select-buffer wl-message-buffer)
 
     (set-buffer message-buf)
+    (wl-deactivate-region)
     (make-local-variable 'truncate-partial-width-windows)
     (setq truncate-partial-width-windows nil)
     (setq truncate-lines wl-message-truncate-lines)
@@ -432,44 +503,44 @@ Returns non-nil if bottom of message."
     (setq wl-message-buffer-cur-summary-buffer summary-buf)
     (setq wl-message-buffer-cur-folder (elmo-folder-name-internal folder))
     (setq wl-message-buffer-cur-number number)
+    (setq wl-message-buffer-flag-indicator
+         (wl-message-flag-indicator (elmo-message-flags folder number)))
+    (wl-line-formatter-setup
+     wl-message-buffer-mode-line-formatter
+     wl-message-mode-line-format
+     wl-message-mode-line-format-spec-alist)
     (setq mode-line-buffer-identification
-         (format "Wanderlust: << %s / %s >>"
-                 (if (memq 'modeline wl-use-folder-petname)
-                     (wl-folder-get-petname (elmo-folder-name-internal
-                                             folder))
-                   (elmo-folder-name-internal folder)) number))
-    ;; highlight body
-;    (when wl-highlight-body-too
-;      (wl-highlight-body))
-    (condition-case ()
-       (wl-message-narrow-to-page)
-      (error nil)); ignore errors.
-    (setq cache-used (cdr cache-used))
+         (funcall wl-message-buffer-mode-line-formatter))
+;;;    ;; highlight body
+;;;    (when wl-highlight-body-too
+;;;      (wl-highlight-body))
+    (ignore-errors (wl-message-narrow-to-page))
     (goto-char (point-min))
     (when (re-search-forward "^$" nil t)
       (wl-message-add-buttons-to-header (point-min) (point))
       (wl-message-add-buttons-to-body (point) (point-max)))
+    (when (and wl-message-use-header-narrowing
+              (not (wl-message-display-all-header-p display-type)))
+      (wl-message-header-narrowing))
     (goto-char (point-min))
-    (unwind-protect
-       (save-excursion
-         (run-hooks 'wl-message-redisplay-hook))
-      ;; go back to summary mode
-      (set-buffer-modified-p nil)
-      (setq buffer-read-only t)
-      (set-buffer summary-buf)
-      (setq summary-win (get-buffer-window summary-buf))
-      (if (window-live-p summary-win)
-         (select-window summary-win)))
-    cache-used))
+    (ignore-errors (run-hooks 'wl-message-redisplay-hook))
+    ;; go back to summary mode
+    (set-buffer-modified-p nil)
+    (setq buffer-read-only t)
+    (set-buffer summary-buf)
+    (setq summary-win (get-buffer-window summary-buf))
+    (if (window-live-p summary-win)
+       (select-window summary-win))))
 
 ;; Use message buffer cache.
-(defun wl-message-buffer-display (folder number flag
+(defun wl-message-buffer-display (folder number display-type
                                         &optional force-reload unread)
-  (let* ((msg-id (elmo-message-field folder number 'message-id))
+  (let* ((msg-id (ignore-errors
+                  (elmo-message-field folder number 'message-id)))
         (fname (elmo-folder-name-internal folder))
         (hit (wl-message-buffer-cache-hit (list fname number msg-id)))
-        (read nil)
-        cache-used)
+        (redisplay nil)
+        entity)
     (when (and hit (not (buffer-live-p hit)))
       (wl-message-buffer-cache-delete (list fname number msg-id))
       (setq hit nil))
@@ -478,59 +549,79 @@ Returns non-nil if bottom of message."
          ;; move hit to the top.
          (wl-message-buffer-cache-sort
           (wl-message-buffer-cache-entry-make (list fname number msg-id) hit))
-         ;; buffer cache is used.
-         (setq cache-used t)
          (with-current-buffer hit
-           (unless (eq wl-message-buffer-cur-flag flag)
-             (setq read t))))
+           ;; Rewind to the top page
+           (widen)
+           (goto-char (point-min))
+           (ignore-errors (wl-message-narrow-to-page))
+           (setq entity wl-message-buffer-mime-entity)
+           (unless (eq wl-message-buffer-cur-display-type display-type)
+             (setq redisplay t))))
       ;; delete tail and add new to the top.
       (setq hit (wl-message-buffer-cache-add (list fname number msg-id)))
-      (setq read t))
-    (if (or force-reload read)
-       (condition-case err
-           (save-excursion
-             (set-buffer hit)
-             (setq
-              cache-used
-              (wl-message-display-internal folder number flag
-                                           force-reload unread))
-             (setq wl-message-buffer-cur-flag flag))
-         (quit
-          (wl-message-buffer-cache-delete)
-          (error "Display message %s/%s is quitted" fname number))
-         (error
-          (wl-message-buffer-cache-delete)
-          (signal (car err) (cdr err))
-          nil))) ;; will not be used
-    (cons hit cache-used)))
-
-(defun wl-message-display-internal (folder number flag
-                                          &optional force-reload unread)
-  (let ((default-mime-charset wl-mime-charset))
-    (setq wl-message-buffer-all-header-flag (eq flag 'all-header))
-    (prog1
-       (if (eq flag 'as-is)
-           (let (wl-highlight-x-face-function)
-             (prog1 (elmo-mime-display-as-is folder number
-                                             (current-buffer)
-                                             (wl-message-get-original-buffer)
-                                             'wl-original-message-mode
-                                             force-reload
-                                             unread
-                                             (wl-message-define-keymap))
-               (let (buffer-read-only)
-                 (wl-highlight-message (point-min) (point-max) t))))
-         (elmo-mime-message-display folder number
-                                    (current-buffer)
-                                    (wl-message-get-original-buffer)
-                                    'wl-original-message-mode
-                                    force-reload
-                                    unread
-                                    (wl-message-define-keymap)))
-      (run-hooks 'wl-message-display-internal-hook)
-      (setq buffer-read-only t))))
-
-(defsubst wl-message-buffer-prefetch-p (folder &optional number)
+      (setq redisplay t))
+    (when (or force-reload redisplay)
+      (condition-case err
+         (with-current-buffer hit
+           (when (or force-reload
+                     (null entity)
+                     (not (elmo-mime-entity-display-p
+                           entity
+                           (if (wl-message-mime-analysis-p display-type)
+                               'mime
+                             'as-is)))
+                     (if (wl-message-display-no-merge-p display-type)
+                         (elmo-mime-entity-reassembled-p entity)
+                       (elmo-mime-entity-fragment-p entity)))
+             (setq entity (elmo-message-mime-entity
+                           folder
+                           number
+                           (wl-message-get-original-buffer)
+                           (and wl-message-auto-reassemble-message/partial
+                                (not (wl-message-display-no-merge-p
+                                      display-type)))
+                           force-reload
+                           unread
+                           (not (wl-message-mime-analysis-p display-type)))))
+           (unless entity
+             (error "Cannot display message %s/%s" fname number))
+           (wl-message-display-internal entity display-type))
+       (quit
+        (wl-message-buffer-cache-delete)
+        (error "Display message %s/%s is quitted" fname number))
+       (error
+        (wl-message-buffer-cache-delete)
+        (signal (car err) (cdr err))
+        nil))) ;; will not be used
+    hit))
+
+(defun wl-message-display-internal (entity display-type)
+  (let ((default-mime-charset wl-mime-charset)
+       (elmo-mime-charset wl-mime-charset)
+       (wl-message-buffer-require-all-header
+        (wl-message-display-all-header-p display-type)))
+    (if (wl-message-mime-analysis-p display-type)
+       (elmo-mime-entity-display entity
+                                 (current-buffer)
+                                 'wl-original-message-mode
+                                 (wl-message-define-keymap))
+      (let* ((elmo-mime-display-header-analysis
+             (wl-message-mime-analysis-p display-type 'header))
+            (wl-highlight-x-face-function
+             (and elmo-mime-display-header-analysis
+                  wl-highlight-x-face-function)))
+       (elmo-mime-entity-display-as-is entity
+                                       (current-buffer)
+                                       'wl-original-message-mode
+                                       (wl-message-define-keymap))
+       (let (buffer-read-only)
+         (wl-highlight-message (point-min) (point-max) t))))
+    (setq wl-message-buffer-cur-display-type display-type
+         wl-message-buffer-mime-entity entity)
+    (run-hooks 'wl-message-display-internal-hook)
+    (setq buffer-read-only t)))
+
+(defun wl-message-buffer-prefetch-p (folder &optional number)
   (and (or (not number)
           (elmo-message-file-p folder number)
           (let ((size (elmo-message-field folder number 'size)))
@@ -562,8 +653,8 @@ Returns non-nil if bottom of message."
            (t wl-message-buffer-prefetch-folder-list)))))
 
 (defsubst wl-message-buffer-prefetch-clear-timer ()
-;;;     cannot use for the bug of fsf-compat package (1.09).
-;;;    (cancel-function-timers 'wl-message-buffer-prefetch-subr)
+;;; cannot use for the bug of fsf-compat package (1.09).
+;;;  (cancel-function-timers 'wl-message-buffer-prefetch-subr)
   (if (fboundp 'run-with-idle-timer)
       (if (featurep 'xemacs)
          (let ((p itimer-list))
@@ -587,32 +678,26 @@ Returns non-nil if bottom of message."
      'wl-message-buffer-prefetch-subr
      folder number count summary charset)))
 
-(defvar wl-message-buffer-prefetch-move-spec-plugged-alist nil)
-(defvar wl-message-buffer-prefetch-move-spec-unplugged-alist nil)
+(defvar wl-message-buffer-prefetch-move-spec-alist nil)
 
 (defun wl-message-buffer-prefetch-get-next (folder number summary)
   (if (buffer-live-p summary)
       (with-current-buffer summary
-       (let* ((wl-summary-move-spec-plugged-alist
-               (or wl-message-buffer-prefetch-move-spec-plugged-alist
-                   wl-summary-move-spec-plugged-alist))
-              (wl-summary-move-spec-unplugged-alist
-               (or wl-message-buffer-prefetch-move-spec-unplugged-alist
-                   wl-summary-move-spec-unplugged-alist))
-              (next (funcall wl-message-buffer-prefetch-get-next-function
-                             number)))
-         (if (and next
-                  (not (wl-message-buffer-prefetch-p folder next)))
-             ;; for Multi folder
-             (wl-message-buffer-prefetch-get-next
-              folder next summary)
-           next)))))
+       (let ((wl-summary-move-spec-alist
+              (or wl-message-buffer-prefetch-move-spec-alist
+                  wl-summary-move-spec-alist))
+             (next number))
+         (while (and (setq next (funcall
+                                 wl-message-buffer-prefetch-get-next-function
+                                 next))
+                     (not (wl-message-buffer-prefetch-p folder next))))
+         next))))
 
 (defun wl-message-buffer-prefetch (folder number count
                                          &optional summary charset)
   (let* ((summary (or summary (get-buffer wl-summary-buffer-name)))
         (num number))
-    (when (and count
+    (when (and (> count 0)
               (wl-message-buffer-prefetch-p folder))
       (unless (wl-message-buffer-prefetch-p folder number)
        (setq num
@@ -626,7 +711,7 @@ Returns non-nil if bottom of message."
                                               &optional summary charset)
   (let* ((summary (or summary (get-buffer wl-summary-buffer-name)))
         next)
-    (when (and count
+    (when (and (> count 0)
               (wl-message-buffer-prefetch-p folder))
       (setq next (wl-message-buffer-prefetch-get-next folder number summary))
       (when next
@@ -648,7 +733,10 @@ Returns non-nil if bottom of message."
                   (key (list (elmo-folder-name-internal folder)
                              number message-id))
                   (hit (wl-message-buffer-cache-hit key))
-                  result time1 time2 sec micro)
+                  (display-type (wl-message-make-display-type
+                                 wl-summary-buffer-display-mime-mode
+                                 wl-summary-buffer-display-header-mode))
+                  time1 time2 sec micro)
              (when wl-message-buffer-prefetch-debug
                (message "%d: count %d, hit %s" number count (buffer-name hit)))
              (if (and hit (buffer-live-p hit))
@@ -664,8 +752,10 @@ Returns non-nil if bottom of message."
                (when wl-message-buffer-prefetch-debug
                  (setq time1 (current-time))
                  (message "Prefetching %d..." number))
-               (setq result (wl-message-buffer-display
-                             folder number 'mime nil 'unread))
+               (wl-message-buffer-display folder number
+                                          display-type nil 'unread)
+               (when (elmo-message-use-cache-p folder number)
+                 (elmo-message-set-cached folder number t))
                (when wl-message-buffer-prefetch-debug
                  (setq time2 (current-time))
                  (setq sec  (- (nth 1 time2)(nth 1 time1)))
@@ -688,15 +778,16 @@ Returns non-nil if bottom of message."
        (when wl-message-buffer-prefetch-debug
          (message "Buffer Cached Messages: %s"
                   (mapconcat
-                   '(lambda (cache)
-                      (if (numberp (nth 1 (car cache)))
-                          (if (string=
-                               (nth 0 (car cache))
-                               (elmo-folder-name-internal folder))
-                              (format "%d"
-                                      (nth 1 (car cache)))
-                            (format "*%d" (nth 1 (car cache))))
-                        "-"))
+
+                   (lambda (cache)
+                     (if (numberp (nth 1 (car cache)))
+                         (if (string=
+                              (nth 0 (car cache))
+                              (elmo-folder-name-internal folder))
+                             (format "%d"
+                                     (nth 1 (car cache)))
+                           (format "*%d" (nth 1 (car cache))))
+                       "-"))
                    wl-message-buffer-cache " "))) )))
 
 (defvar wl-message-button-map (make-sparse-keymap))
@@ -731,8 +822,7 @@ Returns non-nil if bottom of message."
       (wl-summary-redisplay)))
 
 (defun wl-message-uu-substring (buf outbuf &optional first last)
-  (save-excursion
-    (set-buffer buf)
+  (with-current-buffer buf
     (search-forward "\n\n")
     (let ((sp (point))
          ep filename case-fold-search)
@@ -743,20 +833,134 @@ Returns non-nil if bottom of message."
                  (setq filename (buffer-substring (match-beginning 1)(match-end 1)))
                (throw 'done nil)))
          (re-search-forward "^M.*$" nil t)) ; uuencoded string
-       (beginning-of-line)
-       (setq sp (point))
+       (setq sp (point-at-bol))
        (goto-char (point-max))
        (if last
            (re-search-backward "^end" sp t)
          (re-search-backward "^M.*$" sp t)) ; uuencoded string
        (forward-line 1)
        (setq ep (point))
-       (set-buffer outbuf)
-       (goto-char (point-max))
-       (insert-buffer-substring buf sp ep)
-       (set-buffer buf)
+       (with-current-buffer outbuf
+         (goto-char (point-max))
+         (insert-buffer-substring buf sp ep))
        filename))))
 
+;;; Header narrowing courtesy of Hideyuki Shirai.
+(defun wl-message-header-narrowing ()
+  "Narrowing headers."
+  (unless (eq this-command 'wl-summary-redisplay-all-header)
+    (save-excursion
+      (save-restriction
+       (goto-char (point-min))
+       (if (re-search-forward "^$" nil t)
+           (beginning-of-line)
+         (goto-char (point-max)))
+       (narrow-to-region (point-min) (point))
+       (let ((fields wl-message-header-narrowing-fields))
+         (while fields
+           (wl-message-header-narrowing-1 (concat "^" (car fields) ":"))
+           (setq fields (cdr fields))))))))
+
+(defvar wl-message-header-narrowing-map (make-sparse-keymap))
+(define-key wl-message-header-narrowing-map [mouse-2]
+  'wl-message-header-narrowing-again-at-mouse)
+
+(defvar wl-message-header-narrowing-widen-map (make-sparse-keymap))
+(define-key wl-message-header-narrowing-widen-map [mouse-2]
+  'wl-message-header-narrowing-widen-at-mouse)
+
+(defun wl-message-header-narrowing-again-at-mouse (event)
+  (interactive "e")
+  (save-window-excursion
+    (save-excursion
+      (mouse-set-point event)
+      (wl-message-header-narrowing))))
+
+(defun wl-message-header-narrowing-1 (hregexp)
+  (let ((case-fold-search t)
+       ov start end)
+    (goto-char (point-min))
+    (while (re-search-forward hregexp nil t)
+      (setq start (match-beginning 0))
+      (forward-line 1)
+      (setq end (progn (while (looking-at "^[ \t]") (forward-line))
+                      (forward-line -1)
+                      (line-end-position)))
+      (if (<= (count-lines start end) wl-message-header-narrowing-lines)
+         (forward-line 1)
+       (goto-char start)
+       (forward-line (1- wl-message-header-narrowing-lines))
+       (end-of-line)
+       (setq start (point))
+       (unless (eq (get-char-property start 'invisible)
+                   'wl-message-header-narrowing)
+         (setq ov (or
+                   (let ((ovs (overlays-at start))
+                         ov)
+                     (while (and ovs (not (overlayp ov)))
+                       (if (overlay-get (car ovs)
+                                        'wl-message-header-narrowing)
+                           (setq ov (car ovs)))
+                       (setq ovs (cdr ovs)))
+                     ov)
+                   (make-overlay start end)))
+         (overlay-put ov 'wl-message-header-narrowing t)
+         (overlay-put ov 'evaporate t)
+         (overlay-put ov 'invisible 'wl-message-header-narrowing)
+         (overlay-put ov 'after-string
+                      wl-message-header-narrowing-string))))))
+
+(defun wl-message-header-narrowing-widen-at-mouse (event)
+  (interactive "e")
+  (save-selected-window
+    (select-window (posn-window (event-start event)))
+    (let* ((win (selected-window))
+          (wpos (window-start win))
+          (pos (mouse-set-point event))
+          (ovs (overlays-in (1- pos) (1+ pos)))        ;; Uum...
+          ov)
+      (while (and ovs (not (overlayp ov)))
+       (when (overlay-get (car ovs) 'wl-message-header-narrowing)
+         (setq ov (car ovs)))
+       (setq ovs (cdr ovs)))
+      (when (overlayp ov)
+       (overlay-put ov 'face 'wl-message-header-narrowing-face)
+       (overlay-put ov 'local-map wl-message-header-narrowing-map)
+       (overlay-put ov 'invisible nil)
+       (overlay-put ov 'after-string nil))
+      (set-window-start win wpos))))
+
+(defun wl-message-header-narrowing-setup ()
+  (when (boundp 'line-move-ignore-invisible)
+    (set (make-local-variable 'line-move-ignore-invisible) t))
+  (set-text-properties 0 (length wl-message-header-narrowing-string)
+                      `(face
+                        wl-message-header-narrowing-face
+                        keymap
+                        ,wl-message-header-narrowing-widen-map)
+                      wl-message-header-narrowing-string))
+
+(defun wl-message-header-narrowing-toggle ()
+  "Toggle header narrowing."
+  (interactive)
+  (when wl-message-use-header-narrowing
+    (save-excursion
+      (goto-char (point-min))
+      (if (re-search-forward "^$" nil t)
+         (beginning-of-line)
+       (goto-char (point-max)))
+      (let ((ovs (overlays-in (point-min) (point)))
+           ov hn-ovs)
+       (while (setq ov (car ovs))
+         (when (overlay-get ov 'wl-message-header-narrowing)
+           (setq hn-ovs (cons ov hn-ovs)))
+         (setq ovs (cdr ovs)))
+       (if hn-ovs
+           (while hn-ovs
+             (delete-overlay (car hn-ovs))
+             (setq hn-ovs (cdr hn-ovs)))
+         (wl-message-header-narrowing))))))
+
 (require 'product)
 (product-provide (provide 'wl-message) (require 'wl-version))