[PATCH] emacs: notmuch search bugfix

[Mark Walters]

The recent change to use json for notmuch-search.el introduced a bug
in the code for keeping position on refresh. The problem is a
comparison between (plist-get result :thread) and a thread-id returned
by notmuch-search-find-thread-id: the latter is prefixed with
"thread:"

We fix this by adding an option to notmuch-search-find-thread-id to
return the bare thread-id. It appears that notmuch-search-refresh-view
is the only caller of notmuch-search that supplies a thread-id so this
change should be safe (but could theoretically break users .emacs
functions).
---

This is a different version of the bugfix suggested in the parent to
this thread. I think it is nicer but there is a slight risk of breaking
users .emacs lisp functions.

In general I think the thread: prefix should be present where the term
is "really" a search term, but absent when it is must be a thread-id,
and this fits with that idea.

With 0.14 freeze pretty close it might be best to apply this to master
and the simpler no breakage option (in id:"87boinpqfg.fsf at qmul.ac.uk")
to the branch.

Best wishes 

Mark

 emacs/notmuch.el |   10 ++++++----
 1 files changed, 6 insertions(+), 4 deletions(-)

diff --git a/emacs/notmuch.el b/emacs/notmuch.el
index d2d82a9..0fff58a 100644
--- a/emacs/notmuch.el
+++ b/emacs/notmuch.el
@@ -475,10 +475,12 @@ BEG."
 	(push (plist-get (notmuch-search-get-result pos) property) output)))
     output))
 
-(defun notmuch-search-find-thread-id ()
-  "Return the thread for the current thread"
+(defun notmuch-search-find-thread-id (&optional bare)
+  "Return the thread for the current thread
+
+If BARE is set then do not prefix with \"thread:\""
   (let ((thread (plist-get (notmuch-search-get-result) :thread)))
-    (when thread (concat "thread:" thread))))
+    (when thread (concat (when (not bare) "thread:") thread))))
 
 (defun notmuch-search-find-thread-id-region (beg end)
   "Return a list of threads for the current region"
@@ -993,7 +995,7 @@ same relative position within the new buffer."
   (interactive)
   (let ((target-line (line-number-at-pos))
 	(oldest-first notmuch-search-oldest-first)
-	(target-thread (notmuch-search-find-thread-id))
+	(target-thread (notmuch-search-find-thread-id t))
 	(query notmuch-search-query-string)
 	(continuation notmuch-search-continuation))
     (notmuch-kill-this-buffer)
-- 
1.7.9.1