[PATCH v2 1/8] emacs/tree: return true if a thread was found in next-thread

[William Casarin <jb55@jb55.com>]

This will allow us to pop back to parent buffers when there are no
more threads to jump to.

Signed-off-by: William Casarin <jb55@jb55.com>
---
 emacs/notmuch-tree.el | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/emacs/notmuch-tree.el b/emacs/notmuch-tree.el
index c00315e8..4bc05160 100644
--- a/emacs/notmuch-tree.el
+++ b/emacs/notmuch-tree.el
@@ -620,10 +620,14 @@ message will be \"unarchived\", i.e. the tag changes in
   (notmuch-tree-thread-top))
 
 (defun notmuch-tree-next-thread ()
+  "Get the next thread in the current tree. Returns t if a thread was
+found or nil if not."
   (interactive)
   (forward-line 1)
-  (while (not (or (notmuch-tree-get-prop :first) (eobp)))
-    (forward-line 1)))
+  (let (end)
+    (while (not (or (notmuch-tree-get-prop :first) (setq end (eobp))))
+      (forward-line 1))
+    (not end)))
 
 (defun notmuch-tree-thread-mapcar (function)
   "Iterate through all messages in the current thread
-- 
2.23.0