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PonderQuestionHistoryController.php
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			<?php

			final class PonderQuestionHistoryController extends PonderController {

			public function shouldAllowPublic() {
			return true;
			}

			public function handleRequest(AphrontRequest $request) {
			$viewer = $request->getViewer();
			$id = $request->getURIData('id');

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

			$timeline = $this->buildTransactionTimeline(
			$question,
			new PonderQuestionTransactionQuery());
			$timeline->setShouldTerminate(true);

			$qid = $question->getID();

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

			$header = id(new PHUIHeaderView())
			->setHeader($question->getTitle())
			->setHeaderIcon('fa-history');

			$view = id(new PHUITwoColumnView())
			->setHeader($header)
			->setFooter($timeline);

			return $this->newPage()
			->setTitle(pht('Question History'))
			->setCrumbs($crumbs)
			->appendChild($view);
			}

			}