PonderAnswerHistoryController.php
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	<?php

	final class PonderAnswerHistoryController extends PonderController {

	private $id;

	public function willProcessRequest(array $data) {
	$this->id = $data['id'];
	}

	public function processRequest() {
	$request = $this->getRequest();
	$viewer = $request->getUser();

	$answer = id(new PonderAnswerQuery())
	->setViewer($viewer)
	->withIDs(array($this->id))
	->executeOne();
	if (!$answer) {
	return new Aphront404Response();
	}

	$xactions = id(new PonderAnswerTransactionQuery())
	->setViewer($viewer)
	->withObjectPHIDs(array($answer->getPHID()))
	->execute();

	$engine = id(new PhabricatorMarkupEngine())
	->setViewer($viewer);
	foreach ($xactions as $xaction) {
	if ($xaction->getComment()) {
	$engine->addObject(
	$xaction->getComment(),
	PhabricatorApplicationTransactionComment::MARKUP_FIELD_COMMENT);
	}
	}
	$engine->process();

	$timeline = id(new PhabricatorApplicationTransactionView())
	->setUser($viewer)
	->setObjectPHID($answer->getPHID())
	->setTransactions($xactions)
	->setMarkupEngine($engine);

	$qid = $answer->getQuestion()->getID();
	$aid = $answer->getID();

	$crumbs = $this->buildApplicationCrumbs();
	$crumbs->addTextCrumb("Q{$qid}", "/Q{$qid}");
	$crumbs->addTextCrumb("A{$aid}", "/Q{$qid}#{$aid}");
	$crumbs->addTextCrumb(pht('History'));

	return $this->buildApplicationPage(
	array(
	$crumbs,
	$timeline,
	),
	array(
	'title' => pht('Answer History'),
	'device' => true,
	));
	}

	}