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DiffusionLowLevelMercurialBranchesQuery.php
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			<?php

			/**
			* Execute and parse a low-level Mercurial branches query using `hg branches`.
			*/
			final class DiffusionLowLevelMercurialBranchesQuery
			extends DiffusionLowLevelQuery {

			private $contains;

			public function withContainsCommit($commit) {
			$this->contains = $commit;
			return $this;
			}

			protected function executeQuery() {
			$repository = $this->getRepository();

			$specs = array();
			if ($this->contains !== null) {
			$specs['all'] = hgsprintf(
			'(descendants(%s) and head())',
			$this->contains);
			$specs['open'] = hgsprintf(
			'(descendants(%s) and head() and not closed())',
			$this->contains);
			} else {
			$specs['all'] = hgsprintf('head()');
			$specs['open'] = hgsprintf('head() and not closed()');
			}

			$futures = array();
			foreach ($specs as $key => $spec) {
			$futures[$key] = $repository->getLocalCommandFuture(
			'log --template %s --rev %s',
			'{node}\1{branch}\2',
			$spec);
			}

			$branches = array();
			$open = array();
			foreach (new FutureIterator($futures) as $key => $future) {
			list($stdout) = $future->resolvex();

			$lines = explode("\2", $stdout);
			$lines = array_filter($lines);
			foreach ($lines as $line) {
			list($node, $branch) = explode("\1", $line);
			$id = $node.'/'.$branch;
			if (empty($branches[$id])) {
			$branches[$id] = id(new DiffusionRepositoryRef())
			->setShortName($branch)
			->setCommitIdentifier($node);
			}

			if ($key == 'open') {
			$open[$id] = true;
			}
			}
			}

			foreach ($branches as $id => $branch) {
			$branch->setRawFields(
			array(
			'closed' => (empty($open[$id])),
			));
			}

			return array_values($branches);
			}

			}