[PATCH 03/13] lib: optionally support single argument date: queries

[David Bremner <david@tethera.net>]

This relies on the FieldProcessor API, which is only present in xapian
>= 1.3.
---
 lib/database-private.h   |  6 ++++++
 lib/database.cc          |  6 ++++++
 lib/parse-time-vrp.cc    | 21 +++++++++++++++++++++
 lib/parse-time-vrp.h     |  5 +++++
 test/T500-search-date.sh |  6 ++++++
 5 files changed, 44 insertions(+)

diff --git a/lib/database-private.h b/lib/database-private.h
index 3fb10f7..30a045e 100644
--- a/lib/database-private.h
+++ b/lib/database-private.h
@@ -144,6 +144,9 @@ operator&=(_notmuch_features &a, _notmuch_features b)
     return a;
 }
 
+#if HAVE_XAPIAN_FIELD_PROCESSOR
+class DateFieldProcessor;
+#endif
 struct _notmuch_database {
     notmuch_bool_t exception_reported;
 
@@ -176,6 +179,9 @@ struct _notmuch_database {
     Xapian::TermGenerator *term_gen;
     Xapian::ValueRangeProcessor *value_range_processor;
     Xapian::ValueRangeProcessor *date_range_processor;
+#if HAVE_XAPIAN_FIELD_PROCESSOR
+    DateFieldProcessor *date_field_processor;
+#endif
     Xapian::ValueRangeProcessor *last_mod_range_processor;
 };
 
diff --git a/lib/database.cc b/lib/database.cc
index 3b342f1..0e3c90c 100644
--- a/lib/database.cc
+++ b/lib/database.cc
@@ -1000,6 +1000,12 @@ notmuch_database_open_verbose (const char *path,
 	notmuch->term_gen->set_stemmer (Xapian::Stem ("english"));
 	notmuch->value_range_processor = new Xapian::NumberValueRangeProcessor (NOTMUCH_VALUE_TIMESTAMP);
 	notmuch->date_range_processor = new ParseTimeValueRangeProcessor (NOTMUCH_VALUE_TIMESTAMP);
+#if HAVE_XAPIAN_FIELD_PROCESSOR
+	/* This currently relies on the query parser to pass anything
+	 * with a .. to the range processor */
+	notmuch->date_field_processor = new DateFieldProcessor();
+	notmuch->query_parser->add_boolean_prefix("date", notmuch->date_field_processor);
+#endif
 	notmuch->last_mod_range_processor = new Xapian::NumberValueRangeProcessor (NOTMUCH_VALUE_LAST_MOD, "lastmod:");
 
 	notmuch->query_parser->set_default_op (Xapian::Query::OP_AND);
diff --git a/lib/parse-time-vrp.cc b/lib/parse-time-vrp.cc
index 03804cf..b15b77c 100644
--- a/lib/parse-time-vrp.cc
+++ b/lib/parse-time-vrp.cc
@@ -64,3 +64,24 @@ ParseTimeValueRangeProcessor::operator() (std::string &begin, std::string &end)
 
     return valno;
 }
+
+#if HAVE_XAPIAN_FIELD_PROCESSOR
+/* XXX TODO: is throwing an exception the right thing to do here? */
+Xapian::Query DateFieldProcessor::operator()(const std::string & str) {
+    time_t from, to, now;
+
+    /* Use the same 'now' for begin and end. */
+    if (time (&now) == (time_t) -1)
+	throw Xapian::QueryParserError("Unable to get current time");
+
+    if (parse_time_string (str.c_str (), &from, &now, PARSE_TIME_ROUND_DOWN))
+	throw Xapian::QueryParserError ("Didn't understand date specification '" + str + "'");
+
+    if (parse_time_string (str.c_str (), &to, &now, PARSE_TIME_ROUND_UP_INCLUSIVE))
+	throw Xapian::QueryParserError ("Didn't understand date specification '" + str + "'");
+
+    return Xapian::Query(Xapian::Query::OP_AND,
+			 Xapian::Query(Xapian::Query::OP_VALUE_GE, 0, Xapian::sortable_serialise ((double) from)),
+			 Xapian::Query(Xapian::Query::OP_VALUE_LE, 0, Xapian::sortable_serialise ((double) to)));
+}
+#endif
diff --git a/lib/parse-time-vrp.h b/lib/parse-time-vrp.h
index 094c4f8..3bd12bf 100644
--- a/lib/parse-time-vrp.h
+++ b/lib/parse-time-vrp.h
@@ -37,4 +37,9 @@ public:
     Xapian::valueno operator() (std::string &begin, std::string &end);
 };
 
+#if HAVE_XAPIAN_FIELD_PROCESSOR
+class DateFieldProcessor : public Xapian::FieldProcessor {
+    Xapian::Query operator()(const std::string & str);
+};
+#endif
 #endif /* NOTMUCH_PARSE_TIME_VRP_H */
diff --git a/test/T500-search-date.sh b/test/T500-search-date.sh
index f5cea42..198a2e6 100755
--- a/test/T500-search-date.sh
+++ b/test/T500-search-date.sh
@@ -12,6 +12,12 @@ test_begin_subtest "Absolute date range with 'same' operator"
 output=$(notmuch search date:2010-12-16..! | notmuch_search_sanitize)
 test_expect_equal "$output" "thread:XXX   2010-12-16 [1/1] Olivier Berger; Essai accentué (inbox unread)"
 
+if [ "${NOTMUCH_HAVE_XAPIAN_FIELD_PROCESSOR}" = "1" ]; then
+    test_begin_subtest "Absolute date field"
+    output=$(notmuch search date:2010-12-16 | notmuch_search_sanitize)
+    test_expect_equal "$output" "thread:XXX   2010-12-16 [1/1] Olivier Berger; Essai accentué (inbox unread)"
+fi
+
 test_begin_subtest "Absolute time range with TZ"
 notmuch search date:18-Nov-2009_02:19:26-0800..2009-11-18_04:49:52-06:00 | notmuch_search_sanitize > OUTPUT
 cat <<EOF >EXPECTED
-- 
2.7.0