/**
* @throws \BuildException
*/
public function main()
{
GemsAssert::noneEmptyString($this->file, "File parameter not set.");
$text = GemsFile::read($this->file);
$lines = GemsFile::toArray($text);
$version = GemsVersion::get($lines);
$str = self::inc($version);
// replace last line with new version
$text = _::create($lines)->snip(1)->push($str)->join(PHP_EOL);
GemsFile::write($this->file, $text);
}
