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HarbormasterBuildGraph.php
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			<?php

			/**
			* Directed graph representing a build plan
			*/
			final class HarbormasterBuildGraph extends AbstractDirectedGraph {

			private $stepMap;

			public static function determineDependencyExecution(
			HarbormasterBuildPlan $plan) {

			$steps = id(new HarbormasterBuildStepQuery())
			->setViewer(PhabricatorUser::getOmnipotentUser())
			->withBuildPlanPHIDs(array($plan->getPHID()))
			->execute();

			$steps_by_phid = mpull($steps, null, 'getPHID');
			$step_phids = mpull($steps, 'getPHID');

			if (count($steps) === 0) {
			return array();
			}

			$graph = id(new HarbormasterBuildGraph($steps_by_phid))
			->addNodes($step_phids);

			$raw_results = $graph->getNodesInRoughTopologicalOrder();

			$results = array();
			foreach ($raw_results as $node) {
			$results[] = array(
			'node' => $steps_by_phid[$node['node']],
			'depth' => $node['depth'],
			'cycle' => $node['cycle'],
			);
			}

			return $results;
			}

			public function __construct($step_map) {
			$this->stepMap = $step_map;
			}

			protected function loadEdges(array $nodes) {
			$map = array();
			foreach ($nodes as $node) {
			$step = $this->stepMap[$node];

			try {
			$deps = $step->getStepImplementation()->getDependencies($step);
			} catch (Exception $ex) {
			$deps = array();
			}

			$map[$node] = array();
			foreach ($deps as $dep) {
			$map[$node][] = $dep;
			}
			}

			return $map;
			}

			}