diff: include commit message when formatting patch

When formatting a patch as email we do not include the commit's
message in the formatted patch output. Implement this and add a
test that verifies behavior.

1 files changed, 41 insertions, 0 deletions

diff --git a/tests/diff/format_email.c b/tests/diff/format_email.c
index 18ad99bd5..8a0128898 100644
--- a/tests/diff/format_email.c
+++ b/tests/diff/format_email.c
@@ -97,6 +97,47 @@ void test_diff_format_email__simple(void)
 		email, "9264b96c6d104d0e07ae33d3007b6a48246c6f92", &opts);
 }
 
+void test_diff_format_email__with_message(void)
+{
+	git_diff_format_email_options opts = GIT_DIFF_FORMAT_EMAIL_OPTIONS_INIT;
+	const char *email = "From 627e7e12d87e07a83fad5b6bfa25e86ead4a5270 Mon Sep 17 00:00:00 2001\n" \
+	"From: Patrick Steinhardt <ps@pks.im>\n" \
+	"Date: Tue, 24 Nov 2015 13:34:39 +0100\n" \
+	"Subject: [PATCH] Modify content with message\n" \
+	"\n" \
+	"Modify content of file3.txt by appending a new line. Make this\n" \
+	"commit message somewhat longer to test behavior with newlines\n" \
+	"embedded in the message body.\n" \
+	"\n" \
+	"Also test if new paragraphs are included correctly.\n" \
+	"---\n" \
+	" file3.txt | 1 +\n" \
+	" 1 file changed, 1 insertion(+), 0 deletions(-)\n" \
+	"\n" \
+	"diff --git a/file3.txt b/file3.txt\n" \
+	"index 9a2d780..7309653 100644\n" \
+	"--- a/file3.txt\n" \
+	"+++ b/file3.txt\n" \
+	"@@ -3,3 +3,4 @@ file3!\n" \
+	" file3\n" \
+	" file3\n" \
+	" file3\n" \
+	"+file3\n" \
+	"--\n" \
+	"libgit2 0.23.0\n" \
+	"\n";
+
+	opts.body = "Modify content of file3.txt by appending a new line. Make this\n" \
+	"commit message somewhat longer to test behavior with newlines\n" \
+	"embedded in the message body.\n" \
+	"\n" \
+	"Also test if new paragraphs are included correctly.";
+
+	assert_email_match(
+		email, "627e7e12d87e07a83fad5b6bfa25e86ead4a5270", &opts);
+}
+
+
 void test_diff_format_email__multiple(void)
 {
 	git_oid oid;