/**
* @return null|string
*/
private function readMercurial()
{
$hgDir = Path::combine($this->repositoryRoot, '.hg');
if (!is_dir($hgDir) || !OS::hasBinary('hg')) {
return null;
}
$hg = Exec::create('hg', '--repository', $this->repositoryRoot);
// Removes everything but the tag if distance is zero.
$hg->run('log', '-r', '.', '--template', '{latesttag}{sub(\'^-0-m.*\', \'\', \'-{latesttagdistance}-m{node|short}\')}');
$tag = Dot::get($hg->getOutput(), 0);
// Actual null if no lines were returned or `hg log` returned actual "null".
// Either way, need to fall back to the revision id.
if ($tag === null || $tag === 'null' || Strings::startsWith($tag, 'null-')) {
$hg->run('id', '-i');
$tag = Dot::get($hg->getOutput(), 0);
// Remove 'dirty' plus from revision id
$tag = rtrim($tag, '+');
}
$summary = $hg->run('summary')->getOutput();
$isDirty = 0 === count(array_filter($summary, function ($line) {
return preg_match('/^commit: .*\\(clean\\)$/', $line) === 1;
}));
if ($isDirty) {
$tag .= '-dirty';
}
return $tag;
}
