AK+LibTimeZone: Add debug only formatter for Optional

I found this handy for debugging, and so might others.

This now also adds a formatter for TimeZone::TimeZone. This is needed
for FormatIfSupported<Optional<TimeZone::TimeZone>> to compile. As
FormatIfSupported sees a formatter for Optional exists, but not that
there's not one for TimeZone::TimeZone.

1 files changed, 9 insertions, 0 deletions

diff --git a/Userland/Libraries/LibTimeZone/TimeZone.h b/Userland/Libraries/LibTimeZone/TimeZone.h
index e813c9d7ad..52e20170f3 100644
--- a/Userland/Libraries/LibTimeZone/TimeZone.h
+++ b/Userland/Libraries/LibTimeZone/TimeZone.h
@@ -9,6 +9,7 @@
 #include <AK/Array.h>
 #include <AK/DeprecatedString.h>
 #include <AK/Error.h>
+#include <AK/Format.h>
 #include <AK/Optional.h>
 #include <AK/StringView.h>
 #include <AK/Time.h>
@@ -74,3 +75,11 @@ StringView region_to_string(Region region);
 Vector<StringView> time_zones_in_region(StringView region);
 
 }
+
+template<>
+struct AK::Formatter<TimeZone::TimeZone> : Formatter<FormatString> {
+    ErrorOr<void> format(FormatBuilder& builder, TimeZone::TimeZone const& time_zone)
+    {
+        return Formatter<FormatString>::format(builder, TimeZone::time_zone_to_string(time_zone));
+    }
+};