git-send-email: Do not make @-less message ID

When the original $from address fails to yield a valid-looking
e-mail address, we created a bogus looking message ID, formatted
like this:

	Message-Id: <11823357623688-git-send-email->

This commit fixes it by moving call to make_message_id() to
where it matters, namely, before the $message_id is needed to be
placed in the generated e-mail header; this has an important
side effect of making it clear that $from is already available.

Also throw in Sys::Hostname::hostname() just for fun, although I
suspect that the code would never trigger due to the modified
call sequence that makes sure $from is always available.  This
is based on a suggestion by Michael Hendricks.

Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/git-send-email.perl b/git-send-email.perl
index 7c0c90b..9f75551 100755 (executable)
--- a/git-send-email.perl
+++ b/git-send-email.perl
@@ -412,13 +412,21 @@ sub extract_valid_address {
 # 1 second since the last time we were called.
 
 # We'll setup a template for the message id, using the "from" address:
-my $message_id_from = extract_valid_address($from);
-my $message_id_template = "<%s-git-send-email-$message_id_from>";
 
 sub make_message_id
 {
        my $date = time;
        my $pseudo_rand = int (rand(4200));
+       my $du_part;
+       for ($from, $committer, $author) {
+               $du_part = extract_valid_address($_);
+               last if ($du_part ne '');
+       }
+       if ($du_part eq '') {
+               use Sys::Hostname qw();
+               $du_part = 'user@' . Sys::Hostname::hostname();
+       }
+       my $message_id_template = "<%s-git-send-email-$du_part>";
        $message_id = sprintf $message_id_template, "$date$pseudo_rand";
        #print "new message id = $message_id\n"; # Was useful for debugging
 }
@@ -467,6 +475,8 @@ sub send_message
                $ccline = "\nCc: $cc";
        }
        $from = sanitize_address_rfc822($from);
+       make_message_id();
+
        my $header = "From: $from
 To: $to${ccline}
 Subject: $subject
@@ -533,7 +543,6 @@ X-Mailer: git-send-email $gitversion
 
 $reply_to = $initial_reply_to;
 $references = $initial_reply_to || '';
-make_message_id();
 $subject = $initial_subject;
 
 foreach my $t (@files) {
@@ -627,7 +636,6 @@ foreach my $t (@files) {
                        $references = "$message_id";
                }
        }
-       make_message_id();
 }
 
 if ($compose) {