contrib: contacts: add mailmap support

The purpose of git-contacts is to determine a list of people who might
have some interest in a patch or set of changes. It can be used as
git-send-email's --cc-cmd argument or the computed list might be used to
ask for comments on a proposed change.  As such, it is important to
report up-to-date email addresses in the computed list rather than
potentially outdated ones recorded with commits.  Apply git's mailmap
functionality to the retrieved contacts in order to achieve this goal.

Signed-off-by: Eric Sunshine <sunshine@sunshineco.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/contrib/contacts/git-contacts b/contrib/contacts/git-contacts
index 4553add0a6e0a7619b1c6b092d02bea126a14e0b..d80f7d1b6e6928dc7d24a56720caf13220f95236 100755 (executable)
--- a/contrib/contacts/git-contacts
+++ b/contrib/contacts/git-contacts
@@ -133,6 +133,23 @@ sub scan_rev_args {
        close $f;
 }
 
+sub mailmap_contacts {
+       my ($contacts) = @_;
+       my %mapped;
+       my $pid = open2 my $reader, my $writer, qw(git check-mailmap --stdin);
+       for my $contact (keys(%$contacts)) {
+               print $writer "$contact\n";
+               my $canonical = <$reader>;
+               chomp $canonical;
+               $mapped{$canonical} += $contacts->{$contact};
+       }
+       close $reader;
+       close $writer;
+       waitpid($pid, 0);
+       die "git-check-mailmap error: $?\n" if $?;
+       return \%mapped;
+}
+
 if (!@ARGV) {
        die "No input revisions or patch files\n";
 }
@@ -161,6 +178,7 @@ for my $commit (values %commits) {
                $contacts->{$contact}++;
        }
 }
+$contacts = mailmap_contacts($contacts);
 
 my $ncommits = scalar(keys %commits);
 for my $contact (keys %$contacts) {