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DiffusionPathTreeController.php
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			<?php

			final class DiffusionPathTreeController extends DiffusionController {

			public function handleRequest(AphrontRequest $request) {
			$response = $this->loadDiffusionContext();
			if ($response) {
			return $response;
			}

			$drequest = $this->getDiffusionRequest();
			$repository = $drequest->getRepository();

			if (!$repository->canUsePathTree()) {
			return new Aphront404Response();
			}

			$paths = $this->callConduitWithDiffusionRequest(
			'diffusion.querypaths',
			array(
			'path' => $drequest->getPath(),
			'commit' => $drequest->getCommit(),
			));

			$tree = array();
			foreach ($paths as $path) {
			$parts = preg_split('((?<=/))', $path);
			$cursor = &$tree;
			foreach ($parts as $part) {
			if (!is_array($cursor)) {
			$cursor = array();
			}
			if (!isset($cursor[$part])) {
			$cursor[$part] = 1;
			}
			$cursor = &$cursor[$part];
			}
			}

			return id(new AphrontAjaxResponse())->setContent(array('tree' => $tree));
			}
			}