emacs: add a filter option to show

Show the current thread with a different filter (i.e., open messages
in the thread matching the new query).

Bound to 'l' for "limit".

Note that it is not the same as filter in search mode as it replaces
the existing query rather than ANDing with it (but it does keep the
thread-id part of the query).

diff --git a/emacs/notmuch-show.el b/emacs/notmuch-show.el
index a978d3c6701d0573565cc3d90680fe5690ad0550..4dee34bfd9cfb2d6b1ad876884142d48427e1f26 100644 (file)
--- a/emacs/notmuch-show.el
+++ b/emacs/notmuch-show.el
@@ -47,6 +47,7 @@
 (declare-function notmuch-tree "notmuch-tree"
                  (&optional query query-context target buffer-name open-target))
 (declare-function notmuch-tree-get-message-properties "notmuch-tree" nil)
+(declare-function notmuch-read-query "notmuch" (prompt))
 
 (defcustom notmuch-message-headers '("Subject" "To" "Cc" "Date")
   "Headers that should be shown in a message, in this order.
@@ -1372,6 +1373,7 @@ reset based on the original query."
     (define-key map (kbd "<backtab>") 'notmuch-show-previous-button)
     (define-key map (kbd "TAB") 'notmuch-show-next-button)
     (define-key map "f" 'notmuch-show-forward-message)
+    (define-key map "l" 'notmuch-show-filter-thread)
     (define-key map "r" 'notmuch-show-reply-sender)
     (define-key map "R" 'notmuch-show-reply)
     (define-key map "|" 'notmuch-show-pipe-message)
@@ -1660,6 +1662,16 @@ user decision and we should not override it."
     (save-excursion
       (funcall notmuch-show-mark-read-function (window-start) (window-end)))))
 
+(defun notmuch-show-filter-thread (query)
+  "Filter or LIMIT the current thread based on a new query string.
+
+Reshows the current thread with matches defined by the new query-string."
+  (interactive (list (notmuch-read-query "Filter thread: ")))
+  (let ((msg-id (notmuch-show-get-message-id)))
+    (setq notmuch-show-query-context (if (string= query "") nil query))
+    (notmuch-show-refresh-view t)
+    (notmuch-show-goto-message msg-id)))
+
 ;; Functions for getting attributes of several messages in the current
 ;; thread.