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  return [ @ARGV ];
}

sub lines_of {
  map +(chomp,$_)[1], do { local @ARGV = ($_[0]); <> };
}

sub stripspace {
  my ($text) = @_;
  $text =~ /^(\s+)/ && $text =~ s/^$1//mg;
  $text;
}

sub import {
  $_[1] && $_[1] eq '-run_script'
    and return shift->new->run_script;
}

sub new {
  bless {
    option_parser => Getopt::Long::Parser->new(
      config => [ qw(require_order pass_through bundling no_auto_abbrev) ]
    ),
  }, $_[0];
}

sub run_script {
  my ($self, $args) = @_;
  my @args = $args ? @$args : @ARGV;
  (my $cmd = shift @args || 'help') =~ s/-/_/g;

  if (my $meth = $self->can("script_command_${cmd}")) {
    $self->$meth(\@args);
  } else {
    die "No such command ${cmd}";
  }
}

sub script_command_help {
  print "Try `perldoc fatpack` for how to use me\n";
}

sub script_command_pack {
  my ($self, $args) = @_;

  my @modules = split /\r?\n/, $self->trace(args => $args);
  my @packlists = $self->packlists_containing(\@modules);

  my $base = catdir(cwd, 'fatlib');
  $self->packlists_to_tree($base, \@packlists);

  my $file = shift @$args;
  print $self->fatpack_file($file);
}

sub script_command_trace {
  my ($self, $args) = @_;

  $args = $self->call_parser($args => [
    'to=s' => \my $file,
    'to-stderr' => \my $to_stderr,
    'use=s' => \my @additional_use
  ]);

  die "Can't use to and to-stderr on same call" if $file && $to_stderr;

  $file ||= 'fatpacker.trace';

  if (!$to_stderr and -e $file) {
    unlink $file or die "Couldn't remove old trace file: $!";
  }
  my $arg = do {
    if ($to_stderr) {
      ">&STDERR"
    } elsif ($file) {
      ">>${file}"
    }
  };

  $self->trace(
    use => \@additional_use,
    args => $args,
    output => $arg,
  );
}

sub trace {
  my ($self, %opts) = @_;

  my $output = $opts{output};
  my $trace_opts = join ',', $output||'>&STDOUT', @{$opts{use}||[]};

  local $ENV{PERL5OPT} = join ' ',
    ($ENV{PERL5OPT}||()), '-MApp::FatPacker::Trace='.$trace_opts;

  my @args = @{$opts{args}||[]};

  if ($output) {
    # user specified output target, JFDI
    system $^X, @args;
    return;
  } else {
    # no output target specified, slurp
    open my $out_fh, "$^X @args |";
    return do { local $/; <$out_fh> };
  }
}

sub script_command_packlists_for {
  my ($self, $args) = @_;
  foreach my $pl ($self->packlists_containing($args)) {
    print "${pl}\n";
  }
}

sub packlists_containing {
  my ($self, $targets) = @_;
  my @targets;
  {
    local @INC = ('lib', @INC);
    foreach my $t (@$targets) {
      unless (eval { require $t; 1}) {
        warn "Failed to load ${t}: $@\n"
            ."Make sure you're not missing a packlist as a result\n";
        next;
      }
      push @targets, $t;
    }
  }
  my @search = grep -d $_, map catdir($_, 'auto'), @INC;
  my %pack_rev;
  find({
    no_chdir => 1,