+sub mkmaildir ($) {
+ my ($maildir) = @_;
+ for (qw(new tmp cur)) {
+ my $d = "$maildir/$_";
+ next if -d $d;
+ require File::Path;
+ if (!File::Path::mkpath($d) && !-d $d) {
+ die "failed to mkpath($d): $!\n";
+ }
+ }
+}
+
+sub git_to_mail { # git->cat_async callback
+ my ($bref, $oid, $type, $size, $arg) = @_;
+ if ($type ne 'blob') {
+ if ($type eq 'missing') {
+ warn "missing $oid\n";
+ } else {
+ warn "unexpected type=$type for $oid\n";
+ }
+ }
+ if ($size > 0) {
+ my ($write_cb, $kw) = @$arg;
+ $write_cb->($bref, $oid, $kw);
+ }
+}
+
+sub reap_compress { # dwaitpid callback
+ my ($lei, $pid) = @_;
+ my $cmd = delete $lei->{"pid.$pid"};
+ return if $? == 0;
+ $lei->fail("@$cmd failed", $? >> 8);
+}
+
+sub compress_dst {
+ my ($out, $sfx, $lei) = @_;
+ my $cmd = [];
+ if ($sfx eq 'gz') {
+ $cmd->[0] = which($lei->{env}->{GZIP} // 'pigz') //
+ which('gzip') //
+ die "pigz or gzip missing for $sfx\n";
+ # TODO: use IO::Compress::Gzip
+ push @$cmd, '-c'; # stdout
+ push @$cmd, '--rsyncable' if $lei->{opt}->{rsyncable};
+ } else {
+ die "TODO $sfx"
+ }
+ pipe(my ($r, $w)) or die "pipe: $!";
+ my $rdr = { 0 => $r, 1 => $out, 2 => $lei->{2} };
+ my $pid = spawn($cmd, $lei->{env}, $rdr);
+ $lei->{"pid.$pid"} = $cmd;
+ my $pp = gensym;
+ tie *$pp, 'PublicInbox::ProcessPipe', $pid, $w, \&reap_compress, $lei;
+ my $tmp = File::Temp->new("$sfx.lock-XXXXXX", TMPDIR => 1);
+ my $pipe_lk = ($lei->{opt}->{jobs} // 0) > 1 ? bless({
+ lock_path => $tmp->filename,
+ tmp => $tmp
+ }, 'PublicInbox::Lock') : undef;
+ ($pp, $pipe_lk);
+}
+
+sub write_cb {
+ my ($cls, $dst, $lei) = @_;
+ if ($dst =~ s!\A(mbox(?:rd|cl|cl2|o))?:!!) {
+ my $m = "eml2$1";
+ my $eml2mbox = $cls->can($m) or die "$cls->$m missing";
+ my ($out, $pipe_lk);
+ open $out, '>>', $dst or die "open $dst: $!";
+ my $atomic = !!(($lei->{opt}->{jobs} // 0) > 1);
+ if ($dst =~ /\.(gz|bz2|xz)\z/) {
+ ($out, $pipe_lk) = compress_dst($out, $1, $lei);
+ }
+ sub {
+ my ($buf, $oid, $kw) = @_;
+ $buf = $eml2mbox->(PublicInbox::Eml->new($buf), $kw);
+ my $lock = $pipe_lk->lock_for_scope if $pipe_lk;
+ write_in_full($out, $buf, $atomic);
+ }
+ }
+}
+