src/Baum/Node.php
public function makeFirstChildOf($node) {
    if ( $node->children()->count() == 0 )
      return $this->makeChildOf($node);

    return $this->moveToLeftOf($node->children()->first());
  }
public function makeFirstChildOf($node) {
    if ( $node->children()->count() == 0 )
      return $this->makeChildOf($node);

    return $this->moveToLeftOf($node->children()->first());
  }
Make the node the first child of ...

@return \Baum\Node