+
+ local $lei->{opt} = { augment => 1 };
+ $wcb = $wcb_get->('mboxo', $fn);
+ $wcb->(\($x = $buf . "\nx\n"), $deadbeef) for (1..2);
+ $commit->($wcb);
+ open $fh, '<', $fn or BAIL_OUT $!;
+ my @x;
+ PublicInbox::MboxReader->mboxo($fh, sub { push @x, $as_orig->(@_) });
+ is(scalar(@x), 2, 'augmented mboxo');
+ is($x[0], $cmp, 'original message preserved');
+ is($x[1], $buf . "\nx\n", 'new message appended');
+}
+
+{ # stdout support
+ open my $tmp, '+>', undef or BAIL_OUT $!;
+ local $lei->{1} = $tmp;
+ my $wcb = $wcb_get->('mboxrd', '/dev/stdout');
+ $wcb->(\(my $x = $buf), $deadbeef);
+ $commit->($wcb);
+ seek($tmp, 0, SEEK_SET) or BAIL_OUT $!;
+ my $cmp = '';
+ PublicInbox::MboxReader->mboxrd($tmp, sub { $cmp .= $as_orig->(@_) });
+ is($cmp, $buf, 'message written to stdout');
+}
+
+SKIP: { # FIFO support
+ use POSIX qw(mkfifo);
+ my $fn = "$tmpdir/fifo";
+ mkfifo($fn, 0600) or skip("mkfifo not supported: $!", 1);
+ sysopen(my $cat, $fn, O_RDONLY|O_NONBLOCK) or BAIL_OUT $!;
+ my $wcb = $wcb_get->('mboxo', $fn);
+ $wcb->(\(my $x = $buf), $deadbeef);
+ $commit->($wcb);
+ my $cmp = '';
+ $cat->blocking(1);
+ PublicInbox::MboxReader->mboxo($cat, sub { $cmp .= $as_orig->(@_) });
+ is($cmp, $buf, 'message written to FIFO');
+}
+
+{ # Maildir support
+ my $mdr = PublicInbox::MdirReader->new;
+ my $md = "$tmpdir/maildir/";
+ my $wcb = $wcb_get->('maildir', $md);
+ is(ref($wcb), 'CODE', 'got Maildir callback');
+ my $b4dc0ffee = { blob => 'badc0ffee', kw => [] };
+ $wcb->(\(my $x = $buf), $b4dc0ffee);
+
+ my @f;
+ $mdr->maildir_each_file($md, sub { push @f, shift });
+ open my $fh, $f[0] or BAIL_OUT $!;
+ is(do { local $/; <$fh> }, $buf, 'wrote to Maildir');
+
+ $wcb = $wcb_get->('maildir', $md);
+ my $deadcafe = { blob => 'deadcafe', kw => [] };
+ $wcb->(\($x = $buf."\nx\n"), $deadcafe);
+
+ my @x = ();
+ $mdr->maildir_each_file($md, sub { push @x, shift });
+ is(scalar(@x), 1, 'wrote one new file');
+ ok(!-f $f[0], 'old file clobbered');
+ open $fh, $x[0] or BAIL_OUT $!;
+ is(do { local $/; <$fh> }, $buf."\nx\n", 'wrote new file to Maildir');
+
+ local $lei->{opt}->{augment} = 1;
+ $wcb = $wcb_get->('maildir', $md);
+ $wcb->(\($x = $buf."\ny\n"), $deadcafe);
+ $wcb->(\($x = $buf."\ny\n"), $b4dc0ffee); # skipped by dedupe
+ @f = ();
+ $mdr->maildir_each_file($md, sub { push @f, shift });
+ is(scalar grep(/\A\Q$x[0]\E\z/, @f), 1, 'old file still there');
+ my @new = grep(!/\A\Q$x[0]\E\z/, @f);
+ is(scalar @new, 1, '1 new file written (b4dc0ffee skipped)');
+ open $fh, $x[0] or BAIL_OUT $!;
+ is(do { local $/; <$fh> }, $buf."\nx\n", 'old file untouched');
+ open $fh, $new[0] or BAIL_OUT $!;
+ is(do { local $/; <$fh> }, $buf."\ny\n", 'new file written');