From b7366f80525aa0b0c7ab42f8b378cf46389438a4 Mon Sep 17 00:00:00 2001
From: Carl Worth <cworth@cworth.org>
Date: Wed, 4 Nov 2009 16:15:56 -0800
Subject: [PATCH] notmuch.el: Allow for scrolling backwards through thread with
 DEL

Otherwise known as "Backspace" on keyboards in the real, (rather than
emacs), world. This will go by screenfuls for long messages, and
message by message for short messages. So it does the reverse of the
magic space bar, (but without reversing any tag-changing magic that
the magic space bar might have done).
---
 notmuch.el | 37 +++++++++++++++++++++++++++++++++++++
 1 file changed, 37 insertions(+)

diff --git a/notmuch.el b/notmuch.el
index fc7c48cd..68a01187 100644
--- a/notmuch.el
+++ b/notmuch.el
@@ -42,6 +42,7 @@
     (define-key map "x" 'kill-this-buffer)
     (define-key map "+" 'notmuch-show-add-tag)
     (define-key map "-" 'notmuch-show-remove-tag)
+    (define-key map (kbd "DEL") 'notmuch-show-rewind)
     (define-key map " " 'notmuch-show-advance-marking-read-and-archiving)
     map)
   "Keymap for \"notmuch show\" buffers.")
@@ -272,12 +273,48 @@ simply move to the beginning of the current message."
 	  ))
     (recenter 0)))
 
+(defun notmuch-show-find-previous-message ()
+  "Returns the position of the previous message in the buffer.
+
+Or the position of the beginning of the current message if point
+is originally within the message rather than at the beginning of
+it."
+  ; save-excursion doesn't save our window position
+  ; save-window-excursion doesn't save point
+  ; Looks like we have to use both.
+  (save-excursion
+    (save-window-excursion
+      (notmuch-show-previous-message)
+      (point))))
+
 (defun notmuch-show-mark-read-then-next-unread-message ()
   "Remove unread tag from current message, then advance to next unread message."
   (interactive)
   (notmuch-show-remove-tag "unread")
   (notmuch-show-next-unread-message))
 
+(defun notmuch-show-rewind ()
+  "Do reverse scrolling compared to `notmuch-show-advance-marking-read-and-archiving'
+
+Specifically, if the beginning of the previous email is fewer
+than `window-height' lines from the current point, move to it
+just like `notmuch-show-previous-message'.
+
+Otherwise, just scroll down a screenful of the current message.
+
+This command does not modify any message tags, (it does not undo
+any effects from previous calls to
+`notmuch-show-advance-marking-read-and-archiving'."
+  (interactive)
+  (let ((previous (notmuch-show-find-previous-message)))
+    (if (> (count-lines previous (point)) (- (window-height) next-screen-context-lines))
+	(progn
+	  (condition-case nil
+	      (scroll-down nil)
+	    ((beginning-of-buffer) nil))
+	  (goto-char (window-start)))
+      (notmuch-show-previous-message))))
+
 (defun notmuch-show-advance-marking-read-and-archiving ()
   "Advance through buffer, marking read and archiving.
 
-- 
2.26.2