[PATCH v3 4/5] contrib: contacts: add mailmap support

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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potentially outdated ones recorded with commits.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@xxxxxxxxxxxxxx>
---
 contrib/contacts/git-contacts | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/contrib/contacts/git-contacts b/contrib/contacts/git-contacts
index 4553add..d80f7d1 100755
--- 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) {
-- 
1.8.3.3.803.gd114dc6

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