[PATCH] send-email: support coloring dry-run output

["Nguyễn Thái Ngọc Duy" <pclouds@gmail.com>]

It highlights sendmail command and subject lines. The most important
lines to me.

I'm no Perl expert. This patch is by no means for submission. But
maybe it'll motivate someone to do a proper patch.

Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
---
 git-send-email.perl |    6 +++++-
 1 files changed, 5 insertions(+), 1 deletions(-)

diff --git a/git-send-email.perl b/git-send-email.perl
index ef30c55..033ca5e 100755
--- a/git-send-email.perl
+++ b/git-send-email.perl
@@ -1157,9 +1157,13 @@ X-Mailer: git-send-email $gitversion
 			    print "RCPT TO:<$entry>\n";
 			}
 		} else {
+			print color 'yellow';
 			print "Sendmail: $smtp_server ".join(' ',@sendmail_parameters)."\n";
+			print color 'reset';
 		}
-		print $header, "\n";
+		my $colored_header = $header;
+		$colored_header =~ s/^(Subject: .*)/color("bold").$1.color("reset")/em;
+		print $colored_header, "\n";
 		if ($smtp) {
 			print "Result: ", $smtp->code, ' ',
 				($smtp->message =~ /\n([^\n]+\n)$/s), "\n";
-- 
1.7.8.36.g69ee2