[PATCH v2 1/2] contrib: pick: add thread based utility functions

[Mark Walters]

Previously notmuch-pick had no thread based functionality. This adds a
macro to iterate through all messages in a thread. To simplify this it
adds a text-property marker to the first message of each thread.
---
 contrib/notmuch-pick/notmuch-pick.el |   24 ++++++++++++++++++++++++
 1 files changed, 24 insertions(+), 0 deletions(-)

diff --git a/contrib/notmuch-pick/notmuch-pick.el b/contrib/notmuch-pick/notmuch-pick.el
index 10a2bf7..8030842 100644
--- a/contrib/notmuch-pick/notmuch-pick.el
+++ b/contrib/notmuch-pick/notmuch-pick.el
@@ -583,6 +583,29 @@ than only the current message."
 	  (message (format "Command '%s' exited abnormally with code %d"
 			   shell-command exit-code)))))))
 
+(defun notmuch-pick-thread-top ()
+  (interactive)
+  (while (not (notmuch-pick-get-prop :first))
+    (forward-line -1)))
+
+(defun notmuch-pick-thread-mapcar (function)
+  "Iterate through all messages in the current thread
+ and call FUNCTION for side effects."
+  (save-excursion
+    (notmuch-pick-thread-top)
+    (loop collect (funcall function)
+	  do (forward-line)
+	  while (and (notmuch-pick-get-message-properties)
+		     (not (notmuch-pick-get-prop :first))))))
+
+(defun notmuch-pick-get-messages-ids-thread-search ()
+  "Return a search string for all message ids of messages in the current thread."
+  (mapconcat 'identity
+	     (notmuch-pick-thread-mapcar 'notmuch-pick-get-message-id)
+	     " or "))
+
+;; Functions below here display the pick buffer itself.
+
 (defun notmuch-pick-clean-address (address)
   "Try to clean a single email ADDRESS for display. Return
 AUTHOR_NAME if present, otherwise return AUTHOR_EMAIL. Return
@@ -680,6 +703,7 @@ unchanged ADDRESS if parsing fails."
 	(push "├" tree-status)))
 
       (push (concat (if replies "┬" "─") "►") tree-status)
+      (plist-put msg :first (and first (eq 0 depth)))
       (notmuch-pick-goto-and-insert-msg (plist-put msg :tree-status tree-status))
       (pop tree-status)
       (pop tree-status)
-- 
1.7.9.1