send-email: be more lenient and just catch obvious mistakes.

This cleans up the pattern matching subroutine by introducing
two variables to hold regexp to approximately match local-part
and domain in the e-mail address.  It is meant to catch obvious
mistakes with a cheap check.

The patch also moves "scalar" to force Email::Valid->address()
to work in !wantarray environment to extract_valid_address;
earlier it was in the caller of the subroutine, which was way
too error prone.

Signed-off-by: Junio C Hamano <junkio@cox.net>

diff --git a/git-send-email.perl b/git-send-email.perl
index a7a7797..700d0c3 100755 (executable)
--- a/git-send-email.perl
+++ b/git-send-email.perl
@@ -312,16 +312,18 @@ our ($message_id, $cc, %mail, $subject, $reply_to, $references, $message);
 
 sub extract_valid_address {
        my $address = shift;
+       my $local_part_regexp = '[^<>"\s@]+';
+       my $domain_regexp = '[^.<>"\s@]+\.[^<>"\s@]+';
 
        # check for a local address:
-       return $address if ($address =~ /^([\w\-.]+)$/);
+       return $address if ($address =~ /^($local_part_regexp)$/);
 
        if ($have_email_valid) {
-               return Email::Valid->address($address);
+               return scalar Email::Valid->address($address);
        } else {
                # less robust/correct than the monster regexp in Email::Valid,
                # but still does a 99% job, and one less dependency
-               $address =~ /([\w\-.]+@[\w\-.]+)/;
+               $address =~ /($local_part_regexp\@$domain_regexp)/;
                return $1;
        }
 }
@@ -384,7 +386,7 @@ X-Mailer: git-send-email $gitversion
                defined $pid or die $!;
                if (!$pid) {
                        exec($smtp_server,'-i',
-                            map { scalar extract_valid_address($_) }
+                            map { extract_valid_address($_) }
                             @recipients) or die $!;
                }
                print $sm "$header\n$message";