+# Some user information should not be exposed in commit metadata, etc.
+# This generates a cloaked form of such information.
+sub cloak ($) {
+ my $user=shift;
+ # cloak email address using http://xmlns.com/foaf/spec/#term_mbox_sha1sum
+ if ($user=~m/(.+)@/) {
+ my $nick=$1;
+ eval q{use Digest::SHA};
+ return $user if $@;
+ return $nick.'@'.Digest::SHA::sha1_hex("mailto:$user");
+ }
+ else {
+ return $user;
+ }
+}
+