git-send-email: SIG{TERM,INT} handlers

A single signal handler is used for both SIGTERM and
SIGINT in order to clean up after an uncouth termination
of git-send-email.

In particular, the handler resets the text color (this cleanup
was already present), turns on tty echoing (in case termination
occurrs during a masked Password prompt), and informs the user
of of any temporary files created by --compose.

Signed-off-by: Michael Witten <mfwitten@mit.edu>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

git-send-email.perl

@@ -24,8 +24,6 @@
 use Term::ANSIColor;
 use Git;
 
-$SIG{INT} = sub { print color("reset"), "\n"; exit };
-
 package FakeTerm;
 sub new {
 	my ($class, $reason) = @_;
@@ -201,6 +199,29 @@ sub format_2822_time {
     "aliasesfile" => \@alias_files,
 );
 
+# Handle Uncouth Termination
+sub signal_handler {
+
+	# Make text normal
+	print color("reset"), "\n";
+
+	# SMTP password masked
+	system "stty echo";
+
+	# tmp files from --compose
+	if (-e $compose_filename) {
+		print "'$compose_filename' contains an intermediate version of the email you were composing.\n";
+	}
+	if (-e ($compose_filename . ".final")) {
+		print "'$compose_filename.final' contains the composed email.\n"
+	}
+
+	exit;
+};
+
+$SIG{TERM} = \&signal_handler;
+$SIG{INT}  = \&signal_handler;
+
 # Begin by accumulating all the variables (defined above), that we will end up
 # needing, first, from the command line: