/**
* Returns the difference between sourcePath and targetPath as a relative path in
* such a way that if you append the relative path to the source path and collapse
* that, the result is the targetPath.
* @param string $targetPath The target path to map to.
* @param string $sourcePath The source path to start with.
* @return string The relative path from source to target.
*/
public static function diff($sourcePath, $targetPath)
{
$diff = '';
$targetPath = \arc\path::collapse($targetPath);
$sourcePath = \arc\path::collapse($sourcePath);
$commonParent = \arc\path::search($sourcePath, function ($path) use($targetPath, &$diff) {
if (!\arc\path::isChild($targetPath, $path)) {
$diff .= '../';
} else {
return $path;
}
}, false);
$diff .= substr($targetPath, strlen($commonParent));
return $diff;
}
function testIsChild()
{
$this->assertTrue(\arc\path::isChild('/a/b/', '/a/'));
$this->assertFalse(\arc\path::isChild('/b/', '/a/'));
}
