while (<$fh>) {
($cmt, $type) = split / /;
next if $type ne 'blob';
++$n;
$str = $git->cat_file($cmt);
$mime = PublicInbox::MIME->new($str);
while (<$fh>) {
($cmt, $type) = split / /;
next if $type ne 'blob';
++$n;
$str = $git->cat_file($cmt);
$mime = PublicInbox::MIME->new($str);