[PATCH WIP v2 5/6] emacs: show: add an update seen function to post-command-hook

[Mark Walters <markwalters1009@gmail.com>]

Add a function stub for updating seen messages to the
post-command-hook. This dummy function gets called with parameters the
start and end of the current window and can decide what to mark seen
based on that.

Since this is in the post-command-hook it should get called after most
user actions (exceptions include user resizing the window) so it
should be possible to make sure the seen status gets updated whether
the user uses notmuch commands like next-message or normal emacs
commands like scroll-up.

It also removes all of the old mark read/seen points to give a clean
slate for testing new mark read/seen algorithms.
---
 emacs/notmuch-show.el |   32 +++++++++++++++++---------------
 1 files changed, 17 insertions(+), 15 deletions(-)

diff --git a/emacs/notmuch-show.el b/emacs/notmuch-show.el
index 261c2e3..6b6e94a 100644
--- a/emacs/notmuch-show.el
+++ b/emacs/notmuch-show.el
@@ -1142,6 +1142,8 @@ function is used."
   (let ((inhibit-read-only t))
 
     (notmuch-show-mode)
+    (add-hook 'post-command-hook #'notmuch-show-command-hook nil t)
+
     ;; Don't track undo information for this buffer
     (set 'buffer-undo-list t)
 
@@ -1585,6 +1587,16 @@ we are not marking them."
   (notmuch-show-mark-all-seen-read not-mark)
   (notmuch-kill-this-buffer))
 
+(defun notmuch-show-do-seen (start end)
+  "Update seen status for all messages between start and end."
+  )
+
+(defun notmuch-show-command-hook ()
+  (when (eq major-mode 'notmuch-show-mode)
+    ;; We need to redisplay to get window-start and window-end correct.
+    (redisplay)
+    (notmuch-show-do-seen (window-start) (window-end))))
+
 ;; Functions for getting attributes of several messages in the current
 ;; thread.
 
@@ -1720,9 +1732,7 @@ If a prefix argument is given and this is the last message in the
 thread, navigate to the next thread in the parent search buffer."
   (interactive "P")
   (if (notmuch-show-goto-message-next)
-      (progn
-	(notmuch-show-mark-seen)
-	(notmuch-show-message-adjust))
+      (notmuch-show-message-adjust)
     (if pop-at-end
 	(notmuch-show-next-thread)
       (goto-char (point-max)))))
@@ -1733,7 +1743,6 @@ thread, navigate to the next thread in the parent search buffer."
   (if (= (point) (notmuch-show-message-top))
       (notmuch-show-goto-message-previous)
     (notmuch-show-move-to-message-top))
-  (notmuch-show-mark-seen)
   (notmuch-show-message-adjust))
 
 (defun notmuch-show-next-open-message (&optional pop-at-end)
@@ -1748,9 +1757,7 @@ to show, nil otherwise."
     (while (and (setq r (notmuch-show-goto-message-next))
 		(not (notmuch-show-message-visible-p))))
     (if r
-	(progn
-	  (notmuch-show-mark-seen)
-	  (notmuch-show-message-adjust))
+	(notmuch-show-message-adjust)
       (if pop-at-end
 	  (notmuch-show-next-thread)
 	(goto-char (point-max))))
@@ -1763,9 +1770,7 @@ to show, nil otherwise."
     (while (and (setq r (notmuch-show-goto-message-next))
 		(not (notmuch-show-get-prop :match))))
     (if r
-	(progn
-	  (notmuch-show-mark-seen)
-	  (notmuch-show-message-adjust))
+	(notmuch-show-message-adjust)
       (goto-char (point-max)))))
 
 (defun notmuch-show-open-if-matched ()
@@ -1776,8 +1781,7 @@ to show, nil otherwise."
 (defun notmuch-show-goto-first-wanted-message ()
   "Move to the first open message and mark it read"
   (goto-char (point-min))
-  (if (notmuch-show-message-visible-p)
-      (notmuch-show-mark-seen)
+  (unless (notmuch-show-message-visible-p)
     (notmuch-show-next-open-message))
   (when (eobp)
     ;; There are no matched non-excluded messages so open all matched
@@ -1785,8 +1789,7 @@ to show, nil otherwise."
     (notmuch-show-mapc 'notmuch-show-open-if-matched)
     (force-window-update)
     (goto-char (point-min))
-    (if (notmuch-show-message-visible-p)
-	(notmuch-show-mark-seen)
+    (unless (notmuch-show-message-visible-p)
       (notmuch-show-next-open-message))))
 
 (defun notmuch-show-previous-open-message ()
@@ -1796,7 +1799,6 @@ to show, nil otherwise."
 		  (notmuch-show-goto-message-previous)
 		(notmuch-show-move-to-message-top))
 	      (not (notmuch-show-message-visible-p))))
-  (notmuch-show-mark-seen)
   (notmuch-show-message-adjust))
 
 (defun notmuch-show-view-raw-message ()
-- 
1.7.9.1