search: add YYYYMMDD search range via "d:" prefix

This is similar to mairix in that it uses a "d:" prefix; but
only takes YYYYMMDD, for now.  Using custom date/time parsers
via Perl will be much more work:

	nntp://news.gmane.org/20151005222157.GE5880@survex.com

Anyhow, this ought to be more human-friendly than searching by
Unix timestamps, but it requires reindexing to take advantage of.

1 files changed, 9 insertions, 0 deletions

diff --git a/t/search.t b/t/search.t
index 2685348c..db94c0a3 100644
--- a/t/search.t
+++ b/t/search.t
@@ -315,6 +315,15 @@ sub filter_mids {
                 'UTF-8 subject preserved');
 }
 
+{
+        my $res = $ro->query('d:19931002..20101002');
+        ok(scalar @{$res->{msgs}} > 0, 'got results within range');
+        $res = $ro->query('d:20101003..');
+        is(scalar @{$res->{msgs}}, 0, 'nothing after 20101003');
+        $res = $ro->query('d:..19931001');
+        is(scalar @{$res->{msgs}}, 0, 'nothing before 19931001');
+}
+
 done_testing();
 
 1;