From 973391222fbb5d72ffd2d469a221baffa10e0415 Mon Sep 17 00:00:00 2001
From: "David E. Wheeler" <david@justatheory.com>
Date: Mon, 16 Jan 2012 10:58:24 -0800
Subject: [PATCH 1/2] Eliminate `undef` warnings.

---
 Makefile.PL          |  1 +
 lib/Text/Markdown.pm |  3 +++
 t/05empty_markdown.t | 10 ++++++++++
 3 files changed, 14 insertions(+)
 create mode 100644 t/05empty_markdown.t

diff --git a/Makefile.PL b/Makefile.PL
index 9c8f66f..b324098 100644
--- a/Makefile.PL
+++ b/Makefile.PL
@@ -19,6 +19,7 @@ test_requires  'Test::More'      => '0.42';
 test_requires  'Test::Exception' => undef;
 test_requires  'List::MoreUtils' => undef;
 test_requires 'Test::Differences' => undef;
+test_requires 'Test::NoWarnings' => undef;
 test_requires  'FindBin'         => undef;
 
 if ($Module::Install::AUTHOR) {
diff --git a/lib/Text/Markdown.pm b/lib/Text/Markdown.pm
index 1c1f93e..1821315 100644
--- a/lib/Text/Markdown.pm
+++ b/lib/Text/Markdown.pm
@@ -266,6 +266,9 @@ sub urls {
 sub _CleanUpDoc {
     my ($self, $text) = @_;
 
+    # An empty file can end up getting passed as undef.
+    return "\n\n" unless defined $text;
+
     # Standardize line endings:
     $text =~ s{\r\n}{\n}g;  # DOS to Unix
     $text =~ s{\r}{\n}g;    # Mac to Unix
diff --git a/t/05empty_markdown.t b/t/05empty_markdown.t
new file mode 100644
index 0000000..b4beafd
--- /dev/null
+++ b/t/05empty_markdown.t
@@ -0,0 +1,10 @@
+use strict;
+use warnings;
+#use Test::More tests => 21;
+use Test::More 'no_plan';
+use Text::Markdown;
+use Test::NoWarnings;
+
+my $m = Text::Markdown->new;
+ok $m->markdown(''), 'Parse empty string';
+ok $m->markdown(undef), 'Parse undef';

From 984f5e9d4d699e6f1b63ee2df6c79086c1d1d29a Mon Sep 17 00:00:00 2001
From: "David E. Wheeler" <david@justatheory.com>
Date: Mon, 16 Jan 2012 11:01:47 -0800
Subject: [PATCH 2/2] Update plan.

---
 t/05empty_markdown.t | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/t/05empty_markdown.t b/t/05empty_markdown.t
index b4beafd..b3aaf72 100644
--- a/t/05empty_markdown.t
+++ b/t/05empty_markdown.t
@@ -1,7 +1,6 @@
 use strict;
 use warnings;
-#use Test::More tests => 21;
-use Test::More 'no_plan';
+use Test::More tests => 3;
 use Text::Markdown;
 use Test::NoWarnings;