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package Term::Size::Perl;

use strict;

require Exporter;

our @ISA = qw(Exporter);
our @EXPORT_OK = qw(chars pixels);

our $VERSION = '0.031';

=head1 NAME

Term::Size::Perl - Perl extension for retrieving terminal size (Perl version)

=head1 SYNOPSIS

    use Term::Size::Perl;

    ($columns, $rows) = Term::Size::Perl::chars *STDOUT{IO};
    ($x, $y) = Term::Size::Perl::pixels;

=head1 DESCRIPTION

Yet another implementation of C<Term::Size>. Now
in pure Perl, with the exception of a C probe run
on build time.

=head2 FUNCTIONS

=over 4

=item B<chars>

    ($columns, $rows) = chars($h);
    $columns = chars($h);

C<chars> returns the terminal size in units of characters
corresponding to the given filehandle C<$h>.
If the argument is omitted, C<*STDIN{IO}> is used.
In scalar context, it returns the terminal width.

=item B<pixels>

    ($x, $y) = pixels($h);
    $x = pixels($h);

C<pixels> returns the terminal size in units of pixels
corresponding to the given filehandle C<$h>.
If the argument is omitted, C<*STDIN{IO}> is used.
In scalar context, it returns the terminal width.

Many systems with character-only terminals will return C<(0, 0)>.

=back

=head1 SEE ALSO

It all began with L<Term::Size> by Tim Goodwin. You may want to
have a look at:

L<Term::Size>

L<Term::Size::Win32>

L<Term::Size::ReadKey>

Please reports bugs via GitHub,
L<https://github.com/aferreira/cpan-Term-Size-Perl/issues>.
When reporting bugs, it may be helpful to attach the F<Params.pm> generated by
the probe at build time.

=head1 AUTHOR

Adirano Ferreira, E<lt>ferreira@cpan.orgE<gt>

=head1 COPYRIGHT AND LICENSE

Copyright (C) 2006-2007, 2017-2018 by Adriano Ferreira

This library is free software; you can redistribute it and/or modify
it under the same terms as Perl itself.

=cut

require Term::Size::Perl::Params;
my %params = Term::Size::Perl::Params::params();

# ( row, col, x, y )
sub _winsize {
    my $h = shift || *STDIN;
    return unless -t $h;
    my $sz = "\0" x $params{winsize}{sizeof};
    ioctl($h, $params{TIOCGWINSZ}{value}, $sz)
        or return;
    return unpack $params{winsize}{mask}, $sz;
}

sub chars {
    my @sz = _winsize(shift);
    return unless @sz;
    return @sz[1, 0] if wantarray;
    return $sz[1];
}

sub pixels {
    my @sz = _winsize(shift);
    return unless @sz;
    return @sz[2, 3] if wantarray;
    return $sz[2];
}

1;