Use stty for terminal width detection

[vgarvardt]

tput is not available in some systems, like Alpine that is widely used in CI tasks. stty is more widely available and is part of coreutils.

[andrewmclagan]

Agreed, many folks (including us) are using Docker with Alpine images. stty is the go IMO

[mikeerickson]

@vgarvardt I use this writer with docker, but all of our images are based on ubuntu:latest or ubuntu16.04 so it didnt dawn on me to try it with alpine

I will test this against both ubuntu:latest and ubuntu:16.04 and if all is fine there as well, I will get it merged and be part of the next release.

Thanks for the PR :-)

[skluck]

Can I suggest the following change @vgarvardt - it wasn't working for me in CI (CircleCI with default debian php:$version images).

It also defaults to 120 width when non interactive:

private function getWidth()
{
    exec('stty size 2>/dev/null', $out, $exit);
    if ($exit !== 0) {
        return '120';
    }

    // 'stty size' output example: 36 120
    return (int) explode(' ', array_pop($out))[1];
}

The stderr redirect is needed because in debian when non-tty some warning output would be displayed.

I tested it with the following commands:

# interactive
docker run -v $(pwd):/app -w /app --rm -it php:7.2 vendor/bin/phpunit
docker run -v $(pwd):/app -w /app --rm -it php:7.2-alpine vendor/bin/phpunit

# non-interactive
docker run -v $(pwd):/app -w /app --rm php:7.2 vendor/bin/phpunit
docker run -v $(pwd):/app -w /app --rm php:7.2-alpine vendor/bin/phpunit