From 9df103679a9487abf4b1a9b28677e284004d71f2 Mon Sep 17 00:00:00 2001
From: Ian Jackson <ijackson@chiark.greenend.org.uk>
Date: Mon, 4 May 2020 01:26:16 +0100
Subject: [PATCH] TOML::Tiny: Provide hook for formatting DateTime objects

---
 README.pod              | 10 ++++++++++
 lib/TOML/Tiny.pm        | 11 +++++++++++
 lib/TOML/Tiny/Writer.pm |  3 ++-
 3 files changed, 23 insertions(+), 1 deletion(-)

diff --git a/README.pod b/README.pod
index 78a96b9..b04c46d 100644
--- a/README.pod
+++ b/README.pod
@@ -184,6 +184,16 @@ Dates and times which weren't built with DateTime come out as strings.
 Specifying C<inflate_float>, C<inflate_integer>, and
 C<inflate_datetime> is likely to be helpful with this option.
 
+=item datetime_formatter
+
+When encoding a DateTime object, by default C<TOML::Tiny> will use the
+default formatter.  This is not right for TOML which requires RFC3339.
+If you have C<DateTime::Format::RFC3339> available, use this instead:
+
+  my $parser = TOML::Tiny->new(
+    datetime_formatter => DateTime::Format::RFC3339->new(),
+  );
+
 =back
 
 =head2 decode
diff --git a/lib/TOML/Tiny.pm b/lib/TOML/Tiny.pm
index e68f548..89acb36 100644
--- a/lib/TOML/Tiny.pm
+++ b/lib/TOML/Tiny.pm
@@ -52,6 +52,7 @@ sub encode {
   my ($self, $data) = @_;
   TOML::Tiny::Writer::to_toml($data,
     strict_arrays => $self->{strict_arrays},
+    datetime_formatter => $self->{datetime_formatter},
     no_string_guessing => $self->{no_string_guessing},
   );
 }
@@ -241,6 +242,16 @@ Dates and times which weren't built with DateTime come out as strings.
 Specifying C<inflate_float>, C<inflate_integer>, and
 C<inflate_datetime> is likely to be helpful with this option.
 
+=item datetime_formatter
+
+When encoding a DateTime object, by default C<TOML::Tiny> will use the
+default formatter.  This is not right for TOML which requires RFC3339.
+If you have C<DateTime::Format::RFC3339> available, use this instead:
+
+  my $parser = TOML::Tiny->new(
+    datetime_formatter => DateTime::Format::RFC3339->new(),
+  );
+
 =back
 
 =head2 decode
diff --git a/lib/TOML/Tiny/Writer.pm b/lib/TOML/Tiny/Writer.pm
index 831d2e5..4e2275a 100644
--- a/lib/TOML/Tiny/Writer.pm
+++ b/lib/TOML/Tiny/Writer.pm
@@ -110,7 +110,8 @@ sub to_toml {
     }
 
     when (/DateTime/) {
-      return $data->stringify;
+      my $formatter = $param{datetime_formatter};
+      return $formatter ? $formatter->format_datetime($data) : "$data";
     }
 
     when ('Math::BigInt') {
-- 
2.30.2