[notmuch] [PATCH] Make search filters handle disjunctive queries.

[Jed Brown]

notmuch-search-filter accepts now accepts an arbitrary query and will
group if necessary so that we get

  tag:inbox AND (gravy OR biscuits)

notmuch-search-filter-tag now handles multiple terms.  All terms in the
query except AND and OR are interpreted as tags.

Signed-off-by: Jed Brown <jed at 59A2.org>
---
 notmuch.el |   23 ++++++++++++++++++-----
 1 files changed, 18 insertions(+), 5 deletions(-)

diff --git a/notmuch.el b/notmuch.el
index 0cabbe2..43e0566 100644
--- a/notmuch.el
+++ b/notmuch.el
@@ -1057,15 +1057,28 @@ search."
 Runs a new search matching only messages that match both the
 current search results AND the additional query string provided."
   (interactive "sFilter search: ")
-  (notmuch-search (concat notmuch-search-query-string " and " query) notmuch-search-oldest-first))
+  (let ((grouped-query (if (string-match-p "\\<[oO][rR]\\>" query) (concat "( " query " )") query)))
+    (notmuch-search (concat notmuch-search-query-string " and " grouped-query) notmuch-search-oldest-first)))
 
-(defun notmuch-search-filter-by-tag (tag)
-  "Filter the current search results based on a single tag.
+(defun notmuch-search-filter-by-tag (query)
+  "Filter the current search results based on one or more tags.
 
 Runs a new search matching only messages that match both the
-current search results AND that are tagged with the given tag."
+current search results AND that are tagged with the given
+expression involving tags.  For example, the input
+
+  chicken and (gravy or biscuits)
+
+will filter the current search by
+
+  tag:chicken and ( tag:gravy or tag:biscuits )"
   (interactive "sFilter by tag: ")
-  (notmuch-search (concat notmuch-search-query-string " and tag:" tag) notmuch-search-oldest-first))
+  (let ((tagged-query (replace-regexp-in-string "\\([_\+\-]\\|\\w\\)+"
+						(lambda (match) ; Prepend `tag:' to all matches except AND and OR
+						  (if (string-match-p "\\([aA][nN][dD]\\)\\|\\([oO][rR]\\)" match)
+						      match (concat "tag:" match)))
+						query)))
+    (notmuch-search-filter tagged-query)))
 
 (defun notmuch ()
   "Run notmuch to display all mail with tag of 'inbox'"
-- 
1.6.5.3