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+ Sat, 01 Jun 2013 01:16:32 -0700 (PDT)\r
+From: Mark Walters <markwalters1009@gmail.com>\r
+To: notmuch@notmuchmail.org, Austin Clements <aclements@csail.mit.edu>,\r
+ Adam Wolfe Gordon <awg+notmuch@xvx.ca>\r
+Subject: [PATCH v4 5/5] emacs: show: implement lazy hidden part handling\r
+Date: Sat, 1 Jun 2013 09:15:47 +0100\r
+Message-Id: <1370074547-24677-6-git-send-email-markwalters1009@gmail.com>\r
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+\r
+This adds the actual code to do the lazy insertion of hidden parts.\r
+\r
+We use a memory inefficient but simple method: when we come to insert\r
+the part if it is hidden we just store all of the arguments to the\r
+part insertion function as a button property. This means when we want\r
+to show the part we can just resume where we left off.\r
+\r
+One thing is that we can't tell if a lazy part will produce text until\r
+we try to render it so when unhiding a part we check to see if it\r
+rendered; if not we invoke the default part handler (e.g. an external\r
+viewer).\r
+---\r
+ emacs/notmuch-show.el | 52 ++++++++++++++++++++++++++++++++++++++++++-------\r
+ 1 file changed, 45 insertions(+), 7 deletions(-)\r
+\r
+diff --git a/emacs/notmuch-show.el b/emacs/notmuch-show.el\r
+index 49f85ba..92f481b 100644\r
+--- a/emacs/notmuch-show.el\r
++++ b/emacs/notmuch-show.el\r
+@@ -488,12 +488,14 @@ message at DEPTH in the current thread."\r
+ ;; return button\r
+ button))\r
+ \r
+-;; This is taken from notmuch-wash: maybe it should be unified?\r
+ (defun notmuch-show-toggle-part-invisibility (&optional button)\r
+ (interactive)\r
+ (let* ((button (or button (button-at (point))))\r
+- (overlay (button-get button 'overlay)))\r
+- (when overlay\r
++ (overlay (button-get button 'overlay))\r
++ (lazy-part (button-get button :notmuch-lazy-part)))\r
++ ;; We have a part to toggle if there is an overlay or if there is a lazy part.\r
++ ;; If neither is present we cannot toggle the part so we just return nil.\r
++ (when (or overlay lazy-part)\r
+ (let* ((show (button-get button :notmuch-part-hidden))\r
+ (new-start (button-start button))\r
+ (button-label (button-get button :base-label))\r
+@@ -509,7 +511,15 @@ message at DEPTH in the current thread."\r
+ (move-overlay button new-start (point))\r
+ (delete-region (point) old-end))\r
+ (goto-char (min old-point (1- (button-end button))))\r
+- (overlay-put overlay 'invisible (not show))))))\r
++ ;; Return nil if there is a lazy-part, it is empty, and we are\r
++ ;; trying to show it. In all other cases return t.\r
++ (if lazy-part\r
++ (when show\r
++ (button-put button :notmuch-lazy-part nil)\r
++ (notmuch-show-lazy-part lazy-part button))\r
++ ;; else there must be an overlay.\r
++ (overlay-put overlay 'invisible (not show))\r
++ t)))))\r
+ \r
+ ;; MIME part renderers\r
+ \r
+@@ -807,6 +817,28 @@ message at DEPTH in the current thread."\r
+ ;; Return true if we created an overlay.\r
+ t))\r
+ \r
++(defun notmuch-show-lazy-part (part-args button)\r
++ ;; Insert the lazy part after the button for the part.\r
++ (save-excursion\r
++ (goto-char (1+ (button-end button)))\r
++ (let* ((inhibit-read-only t)\r
++ ;; We need to use markers for the start and end of the part\r
++ ;; because the part insertion functions do not guarantee\r
++ ;; to leave point at the end of the part.\r
++ (part-beg (copy-marker (point) nil))\r
++ (part-end (copy-marker (point) t))\r
++ ;; We have to save the depth as we can't find the depth\r
++ ;; when narrowed.\r
++ (depth (notmuch-show-get-depth)))\r
++ (save-restriction\r
++ (narrow-to-region part-beg part-end)\r
++ (delete-region part-beg part-end)\r
++ (apply #'notmuch-show-insert-bodypart-internal part-args)\r
++ (indent-rigidly part-beg part-end depth))\r
++ ;; Create the overlay. If the lazy-part turned out to be empty/not\r
++ ;; showable this returns nil.\r
++ (notmuch-show-create-part-overlays button part-beg part-end))))\r
++\r
+ (defun notmuch-show-insert-bodypart (msg part depth &optional hide)\r
+ "Insert the body part PART at depth DEPTH in the current thread.\r
+ \r
+@@ -825,7 +857,11 @@ If HIDE is non-nil then initially hide this part."\r
+ (notmuch-show-insert-part-header nth mime-type content-type (plist-get part :filename))))\r
+ (content-beg (point)))\r
+ \r
+- (notmuch-show-insert-bodypart-internal msg part mime-type nth depth button)\r
++ (if (not hide)\r
++ (notmuch-show-insert-bodypart-internal msg part mime-type nth depth button)\r
++ (button-put button :notmuch-lazy-part\r
++ (list msg part mime-type nth depth button)))\r
++\r
+ ;; Some of the body part handlers leave point somewhere up in the\r
+ ;; part, so we make sure that we're down at the end.\r
+ (goto-char (point-max))\r
+@@ -2009,8 +2045,10 @@ is destroyed when FN returns."\r
+ (defun notmuch-show-part-button-default (&optional button)\r
+ (interactive)\r
+ (let ((button (or button (button-at (point)))))\r
+- (if (button-get button 'overlay)\r
+- (notmuch-show-toggle-part-invisibility button)\r
++ ;; Try to toggle the part, if that fails then call the default\r
++ ;; action. The toggle fails if the part has no emacs renderable\r
++ ;; content.\r
++ (unless (notmuch-show-toggle-part-invisibility button)\r
+ (call-interactively notmuch-show-part-button-default-action))))\r
+ \r
+ (defun notmuch-show-save-part ()\r
+-- \r
+1.7.10.4\r
+\r
projects / notmuch-archives.git / commitdiff