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Steve Schnepp
Steve Schnepp

Reputation: 4680

How do I retrieve the terminal width in Perl?

I want to output a progress bar, but how do I retrieve the terminal width in Perl?

A core Perl solution would be preferred, since I don't have access to a compiler, just an already installed 5.8.2 Perl.

Upvotes: 15

Views: 11396

Answers (4)

roryrjb
roryrjb

Reputation: 889

This obviously depends on the platform, but a very simple solution that works out of the box on Linux is this:

my $width = `tput cols`;

Upvotes: 15

Matt Ryall
Matt Ryall

Reputation: 10545

The FAQ which ships with Perl has the answer to this question. If you run perldoc -q "screen size", you'll get the following:

How do I get the screen size?

If you have Term::ReadKey module installed from CPAN, you can use it to fetch the width and height in characters and in pixels:

use Term::ReadKey;
($wchar, $hchar, $wpixels, $hpixels) = GetTerminalSize();

This is more portable than the raw "ioctl", but not as illustrative:

require 'sys/ioctl.ph';
die "no TIOCGWINSZ" unless defined &TIOCGWINSZ;
open(TTY, "+</dev/tty") or die "No tty: $!";
unless (ioctl(TTY, &TIOCGWINSZ, $winsize='')) {
    die sprintf "$0: ioctl TIOCGWINSZ (%08x: $!)\n", &TIOCGWINSZ;
}
($row, $col, $xpixel, $ypixel) = unpack('S4', $winsize);
print "(row,col) = ($row,$col)";
print "  (xpixel,ypixel) = ($xpixel,$ypixel)" if $xpixel || $ypixel;
print "\n";

So you can use the last one if you want a pure Perl solution, or install Term::ReadKey from CPAN if you want a simpler solution in your code but more up-front set-up.

Upvotes: 35

brian d foy
brian d foy

Reputation: 132783

If you want to make a progress bar, don't sweat the details. Use one of the many progress bar modules on CPAN and be done with it.

Upvotes: 8

Dan
Dan

Reputation: 63390

Term::Size::Any looks to be what you're after.

Upvotes: 6

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