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    my($self, $identifier) = @_;
    $self->{_prereqs}->feature($identifier);
}

sub prereq { shift->prereqs }

sub prereqs {
    my $self = shift;
    $self->{_prereqs}->as_cpan_meta;
}

sub merged_requirements {
    my $self = shift;
    $self->{_prereqs}->merged_requirements;
}

sub effective_prereqs {
    my($self, $features) = @_;
    $self->prereqs_with(@{$features || []});
}

sub prereqs_with {
    my($self, @feature_identifiers) = @_;

    my @others = map { $self->feature($_)->prereqs } @feature_identifiers;
    $self->prereqs->with_merged_prereqs(\@others);
}

sub prereq_specs {
    my $self = shift;
    $self->prereqs->as_string_hash;
}

sub prereq_for_module {
    my($self, $module) = @_;
    $self->{_prereqs}->find($module);
}

sub options_for_module {
    my($self, $module) = @_;
    my $prereq = $self->prereq_for_module($module) or return;
    $prereq->requirement->options;
}

sub merge_meta {
    my($self, $file, $version) = @_;

    require CPAN::Meta;

    $version ||= $file =~ /\.yml$/ ? '1.4' : '2';

    my $prereq = $self->prereqs;

    my $meta = CPAN::Meta->load_file($file);
    my $prereqs_hash = $prereq->with_merged_prereqs($meta->effective_prereqs)->as_string_hash;
    my $struct = { %{$meta->as_struct}, prereqs => $prereqs_hash };

    CPAN::Meta->new($struct)->save($file, { version => $version });
}

sub _d($) {
    require Data::Dumper;
    chomp(my $value = Data::Dumper->new([$_[0]])->Terse(1)->Dump);
    $value;
}

sub _default_cpanfile {
    my $file = Cwd::abs_path('cpanfile');
    untaint $file;
}

sub to_string {
    my($self, $include_empty) = @_;

    my $mirrors = $self->mirrors;
    my $prereqs = $self->prereq_specs;

    my $code = '';
    $code .= $self->_dump_mirrors($mirrors);
    $code .= $self->_dump_prereqs($prereqs, $include_empty);

    for my $feature ($self->features) {
        $code .= "feature @{[ _d $feature->{identifier} ]}, @{[ _d $feature->{description} ]} => sub {\n";
        $code .= $self->_dump_prereqs($feature->{prereqs}->as_string_hash, $include_empty, 4);
        $code .= "};\n\n";
    }

    $code =~ s/\n+$/\n/s;
    $code;
}

sub _dump_mirrors {
    my($self, $mirrors) = @_;

    my $code = "";

    for my $url (@$mirrors) {
        $code .= "mirror @{[ _d $url ]};\n";
    }

    $code =~ s/\n+$/\n/s;
    $code;
}

sub _dump_prereqs {
    my($self, $prereqs, $include_empty, $base_indent) = @_;

    my $code = '';
    for my $phase (qw(runtime configure build test develop)) {
        my $indent = $phase eq 'runtime' ? '' : '    ';
        $indent .= (' ' x ($base_indent || 0));

        my($phase_code, $requirements);
        $phase_code .= "on $phase => sub {\n" unless $phase eq 'runtime';

        for my $type (qw(requires recommends suggests conflicts)) {
            for my $mod (sort keys %{$prereqs->{$phase}{$type}}) {
                my $ver = $prereqs->{$phase}{$type}{$mod};
                $phase_code .= $ver eq '0'
                             ? "${indent}$type @{[ _d $mod ]}"
                             : "${indent}$type @{[ _d $mod ]}, @{[ _d $ver ]}";