Term::Size::Unix - Retrieve terminal size (Unix version)

    use Term::Size::Unix;

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

  THIS IS AN UNOFFICIAL PATCH AGAINST Term-Size 0.2 DISTRIBUTION 
  FOUND ON CPAN (http://search.cpan.org/~timpx/Term-Size-0.2/).
  IT IS UNOFFICIAL IN THE SENSE THAT THE AUTHOR Tim Goodwin 
  HASN'T APPROVED IT (YET, I HOPE). BECAUSE OF THIS, THIS 
  DISTRIBUTION IS NOT INDEXED AND AVAILABLE VIA cpan OR cpanp 
  SHELLS UNLESS YOU EXPLICITLY SAY 
  "install FERREIRA/Term-Size-0.203.tar.gz". 

  THIS IS UNDELICATE? I THINK IT IS IN A CERTAIN SENSE. BUT IT 
  IS A WAY TO UNFREEZE THE CURRENT DISTRIBUTION STATUS. IF TIM 
  DISAPPROVES, I WILL REMOVE THIS DISTRIBUTION RIGHT AWAY. 
  IF HE APPROVES, I WILL REMOVE THIS DISTRIBUTION RIGHT AWAY 
  AND WORK OUT (AFTER BEEN GIVEN MAINTAINERSHIP STATUS) 
  A DISTRIBUTION WITHOUT THIS NOTE AND WHICH INDEXES CORRECTLY.

Term::Size is a Perl module which provides a straightforward way to retrieve the terminal size.

Both functions take an optional filehandle argument, which defaults to *STDIN{IO}. They both return a list of two values, which are the current width and height, respectively, of the terminal associated with the specified filehandle.

Term::Size::chars returns the size in units of characters, whereas Term::Size::pixels uses units of pixels.

In a scalar context, both functions return the first element of the list, that is, the terminal width.

The functions may be imported.

If you need to pass a filehandle to either of the Term::Size functions, beware that the *STDOUT{IO} syntax is only supported in Perl 5.004 and later. If you have an earlier version of Perl, or are interested in backwards compatibility, use *STDOUT instead.

1. Refuse to run in a too narrow window.

    use Term::Size;

    die "Need 80 column screen" if Term::Size::chars *STDOUT{IO} < 80;

2. Track window size changes.

    use Term::Size 'chars';

    my $changed = 1;

    while (1) {
            local $SIG{'WINCH'} = sub { $changed = 1 };

            if ($changed) {
                    ($cols, $rows) = chars;
                    # Redraw, or whatever.
                    $changed = 0;
            }
    }

Both functions return undef if there is an error.

If the terminal size information is not available, the functions will normally return (0, 0), but this depends on your system. On character only terminals, pixels will normally return (0, 0).

It only works on Unix systems.

Tim Goodwin, <tim@uunet.pipex.com>, 1997-04-23.

Candidate for maintainership: Adriano Ferreira, <ferreira@cpan.org>, 2006-05-19.