DiffusionMercurialRequest.php
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	<?php

	/**
	* @group diffusion
	*/
	final class DiffusionMercurialRequest extends DiffusionRequest {

	protected function getSupportsBranches() {
	return true;
	}

	protected function didInitialize() {
	// Expand abbreviated hashes to full hashes so "/rXnnnn" (i.e., fewer than
	// 40 characters) works correctly.
	if (!$this->commit) {
	return;
	}

	if (strlen($this->commit) == 40) {
	return;
	}

	$this->expandCommitName();
	}

	public function getBranch() {
	if ($this->branch) {
	return $this->branch;
	}

	if ($this->repository) {
	return $this->repository->getDefaultBranch();
	}

	throw new Exception("Unable to determine branch!");
	}

	public function getCommit() {
	if ($this->commit) {
	return $this->commit;
	}
	return $this->getBranch();
	}

	public function getStableCommitName() {
	if (!$this->stableCommitName) {
	if ($this->commit) {
	$this->stableCommitName = $this->commit;
	} else {

	// NOTE: For branches with spaces in their name like "a b", this
	// does not work properly:
	//
	// $ hg log --rev 'a b'
	//
	// We can use revsets instead:
	//
	// $ hg log --rev branch('a b')
	//
	// ...but they require a somewhat newer version of Mercurial. Instead,
	// use "-b" flag with limit 1 for greatest compatibility across
	// versions.

	list($this->stableCommitName) = $this->repository->execxLocalCommand(
	'log --template=%s -b %s --limit 1',
	'{node}',
	$this->getBranch());
	}
	}
	return $this->stableCommitName;
	}

	}