[PATCH v4 4/4] imap-send: match header names case insensitively

["Harald Nordgren via GitGitGadget" <gitgitgadget@gmail.com>]

From: Harald Nordgren <haraldnordgren@gmail.com>

imap-send says "no messages found to send" for a message whose headers
are spelled "from:", "date:" or "subject:", although RFC 5322 treats
header field names as case insensitive. Match the three names in any
case.

Signed-off-by: Harald Nordgren <haraldnordgren@gmail.com>
---
 imap-send.c           |  6 +++---
 t/t9001-send-email.sh | 15 +++++++++++++++
 2 files changed, 18 insertions(+), 3 deletions(-)

diff --git a/imap-send.c b/imap-send.c
index 706c517e51..b8dac92c70 100644
--- a/imap-send.c
+++ b/imap-send.c
@@ -1462,11 +1462,11 @@ static bool has_required_headers(const char *line)
 	bool from = false, date = false, subject = false;
 
 	while ((line = strchr(line, '\n')) && *++line != '\n') {
-		if (starts_with(line, "From: "))
+		if (istarts_with(line, "From: "))
 			from = true;
-		else if (starts_with(line, "Date: "))
+		else if (istarts_with(line, "Date: "))
 			date = true;
-		else if (starts_with(line, "Subject: "))
+		else if (istarts_with(line, "Subject: "))
 			subject = true;
 	}
 	return from && date && subject;
diff --git a/t/t9001-send-email.sh b/t/t9001-send-email.sh
index 1f77c14315..897473e786 100755
--- a/t/t9001-send-email.sh
+++ b/t/t9001-send-email.sh
@@ -2898,4 +2898,19 @@ test_expect_success $PREREQ '--imap-sent-folder stores a copy of the sent patch'
 	test_grep "(1/1) done" err
 '
 
+test_expect_success $PREREQ 'imap-send matches header names in any case' '
+	test_config imap.tunnel ./fake-imap-server &&
+	cat >lowercase.mbox <<-\EOF &&
+	From mboxrd@z Thu Jan  1 00:00:00 1970
+	from: Example <from@example.com>
+	date: Thu, 1 Jan 1970 00:00:00 +0000
+	subject: [PATCH] lowercase headers
+
+	body
+	EOF
+	git imap-send --folder=INBOX <lowercase.mbox 2>err &&
+	test_grep "^Sending 1 message to INBOX folder" err &&
+	test_grep "(1/1) done" err
+'
+
 test_done
-- 
gitgitgadget