DiffusionBrowseFileController.php
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Created: Thu, May 30, 11:13

DiffusionBrowseFileController.php
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	<?php

	final class DiffusionBrowseFileController extends DiffusionBrowseController {

	private $lintCommit;
	private $lintMessages;
	private $coverage;

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

	$before = $request->getStr('before');
	if ($before) {
	return $this->buildBeforeResponse($before);
	}

	$path = $drequest->getPath();

	$preferences = $viewer->loadPreferences();

	$show_blame = $request->getBool(
	'blame',
	$preferences->getPreference(
	PhabricatorUserPreferences::PREFERENCE_DIFFUSION_BLAME,
	false));
	$show_color = $request->getBool(
	'color',
	$preferences->getPreference(
	PhabricatorUserPreferences::PREFERENCE_DIFFUSION_COLOR,
	true));

	$view = $request->getStr('view');
	if ($request->isFormPost() && $view != 'raw' && $viewer->isLoggedIn()) {
	$preferences->setPreference(
	PhabricatorUserPreferences::PREFERENCE_DIFFUSION_BLAME,
	$show_blame);
	$preferences->setPreference(
	PhabricatorUserPreferences::PREFERENCE_DIFFUSION_COLOR,
	$show_color);
	$preferences->save();

	$uri = $request->getRequestURI()
	->alter('blame', null)
	->alter('color', null);

	return id(new AphrontRedirectResponse())->setURI($uri);
	}

	// We need the blame information if blame is on and we're building plain
	// text, or blame is on and this is an Ajax request. If blame is on and
	// this is a colorized request, we don't show blame at first (we ajax it
	// in afterward) so we don't need to query for it.
	$needs_blame = ($show_blame && !$show_color) \|\|
	($show_blame && $request->isAjax());

	$file_content = DiffusionFileContent::newFromConduit(
	$this->callConduitWithDiffusionRequest(
	'diffusion.filecontentquery',
	array(
	'commit' => $drequest->getCommit(),
	'path' => $drequest->getPath(),
	'needsBlame' => $needs_blame,
	)));
	$data = $file_content->getCorpus();

	if ($view === 'raw') {
	return $this->buildRawResponse($path, $data);
	}

	$this->loadLintMessages();
	$this->coverage = $drequest->loadCoverage();

	$binary_uri = null;
	if (ArcanistDiffUtils::isHeuristicBinaryFile($data)) {
	$file = $this->loadFileForData($path, $data);
	$file_uri = $file->getBestURI();

	if ($file->isViewableImage()) {
	$corpus = $this->buildImageCorpus($file_uri);
	} else {
	$corpus = $this->buildBinaryCorpus($file_uri, $data);
	$binary_uri = $file_uri;
	}
	} else {
	// Build the content of the file.
	$corpus = $this->buildCorpus(
	$show_blame,
	$show_color,
	$file_content,
	$needs_blame,
	$drequest,
	$path,
	$data);
	}

	if ($request->isAjax()) {
	return id(new AphrontAjaxResponse())->setContent($corpus);
	}

	require_celerity_resource('diffusion-source-css');

	// Render the page.
	$view = $this->buildActionView($drequest);
	$action_list = $this->enrichActionView(
	$view,
	$drequest,
	$show_blame,
	$show_color);

	$properties = $this->buildPropertyView($drequest, $action_list);
	$object_box = id(new PHUIObjectBoxView())
	->setHeader($this->buildHeaderView($drequest))
	->addPropertyList($properties);

	$content = array();
	$content[] = $object_box;

	$follow = $request->getStr('follow');
	if ($follow) {
	$notice = new AphrontErrorView();
	$notice->setSeverity(AphrontErrorView::SEVERITY_WARNING);
	$notice->setTitle(pht('Unable to Continue'));
	switch ($follow) {
	case 'first':
	$notice->appendChild(
	pht("Unable to continue tracing the history of this file because ".
	"this commit is the first commit in the repository."));
	break;
	case 'created':
	$notice->appendChild(
	pht("Unable to continue tracing the history of this file because ".
	"this commit created the file."));
	break;
	}
	$content[] = $notice;
	}

	$renamed = $request->getStr('renamed');
	if ($renamed) {
	$notice = new AphrontErrorView();
	$notice->setSeverity(AphrontErrorView::SEVERITY_NOTICE);
	$notice->setTitle(pht('File Renamed'));
	$notice->appendChild(
	pht("File history passes through a rename from '%s' to '%s'.",
	$drequest->getPath(), $renamed));
	$content[] = $notice;
	}

	$content[] = $corpus;
	$content[] = $this->buildOpenRevisions();

	$crumbs = $this->buildCrumbs(
	array(
	'branch' => true,
	'path' => true,
	'view' => 'browse',
	));

	$basename = basename($this->getDiffusionRequest()->getPath());

	return $this->buildApplicationPage(
	array(
	$crumbs,
	$content,
	),
	array(
	'title' => $basename,
	));
	}

	private function loadLintMessages() {
	$drequest = $this->getDiffusionRequest();
	$branch = $drequest->loadBranch();

	if (!$branch \|\| !$branch->getLintCommit()) {
	return;
	}

	$this->lintCommit = $branch->getLintCommit();

	$conn = id(new PhabricatorRepository())->establishConnection('r');

	$where = '';
	if ($drequest->getLint()) {
	$where = qsprintf(
	$conn,
	'AND code = %s',
	$drequest->getLint());
	}

	$this->lintMessages = queryfx_all(
	$conn,
	'SELECT * FROM %T WHERE branchID = %d %Q AND path = %s',
	PhabricatorRepository::TABLE_LINTMESSAGE,
	$branch->getID(),
	$where,
	'/'.$drequest->getPath());
	}

	private function buildCorpus(
	$show_blame,
	$show_color,
	DiffusionFileContent $file_content,
	$needs_blame,
	DiffusionRequest $drequest,
	$path,
	$data) {

	if (!$show_color) {
	$style =
	"border: none; width: 100%; height: 80em; font-family: monospace";
	if (!$show_blame) {
	$corpus = phutil_tag(
	'textarea',
	array(
	'style' => $style,
	),
	$file_content->getCorpus());
	} else {
	$text_list = $file_content->getTextList();
	$rev_list = $file_content->getRevList();
	$blame_dict = $file_content->getBlameDict();

	$rows = array();
	foreach ($text_list as $k => $line) {
	$rev = $rev_list[$k];
	$author = $blame_dict[$rev]['author'];
	$rows[] =
	sprintf("%-10s %-20s %s", substr($rev, 0, 7), $author, $line);
	}

	$corpus = phutil_tag(
	'textarea',
	array(
	'style' => $style,
	),
	implode("\n", $rows));
	}
	} else {
	require_celerity_resource('syntax-highlighting-css');
	$text_list = $file_content->getTextList();
	$rev_list = $file_content->getRevList();
	$blame_dict = $file_content->getBlameDict();

	$text_list = implode("\n", $text_list);
	$text_list = PhabricatorSyntaxHighlighter::highlightWithFilename(
	$path,
	$text_list);
	$text_list = explode("\n", $text_list);

	$rows = $this->buildDisplayRows($text_list, $rev_list, $blame_dict,
	$needs_blame, $drequest, $show_blame, $show_color);

	$corpus_table = javelin_tag(
	'table',
	array(
	'class' => "diffusion-source remarkup-code PhabricatorMonospaced",
	'sigil' => 'phabricator-source',
	),
	$rows);

	if ($this->getRequest()->isAjax()) {
	return $corpus_table;
	}

	$id = celerity_generate_unique_node_id();

	$projects = $drequest->loadArcanistProjects();
	$langs = array();
	foreach ($projects as $project) {
	$ls = $project->getSymbolIndexLanguages();
	if (!$ls) {
	continue;
	}
	$dep_projects = $project->getSymbolIndexProjects();
	$dep_projects[] = $project->getPHID();
	foreach ($ls as $lang) {
	if (!isset($langs[$lang])) {
	$langs[$lang] = array();
	}
	$langs[$lang] += $dep_projects + array($project);
	}
	}

	$lang = last(explode('.', $drequest->getPath()));

	if (isset($langs[$lang])) {
	Javelin::initBehavior(
	'repository-crossreference',
	array(
	'container' => $id,
	'lang' => $lang,
	'projects' => $langs[$lang],
	));
	}

	$corpus = phutil_tag(
	'div',
	array(
	'id' => $id,
	),
	$corpus_table);

	Javelin::initBehavior('load-blame', array('id' => $id));
	}

	$edit = $this->renderEditButton();
	$file = $this->renderFileButton();
	$header = id(new PHUIHeaderView())
	->setHeader(pht('File Contents'))
	->addActionLink($edit)
	->addActionLink($file);

	$corpus = id(new PHUIObjectBoxView())
	->setHeader($header)
	->appendChild($corpus);

	return $corpus;
	}

	private function enrichActionView(
	PhabricatorActionListView $view,
	DiffusionRequest $drequest,
	$show_blame,
	$show_color) {

	$viewer = $this->getRequest()->getUser();
	$base_uri = $this->getRequest()->getRequestURI();

	$view->addAction(
	id(new PhabricatorActionView())
	->setName(pht('Show Last Change'))
	->setHref(
	$drequest->generateURI(
	array(
	'action' => 'change',
	)))
	->setIcon('fa-backward'));

	if ($show_blame) {
	$blame_text = pht('Disable Blame');
	$blame_icon = 'fa-exclamation-circle lightgreytext';
	$blame_value = 0;
	} else {
	$blame_text = pht('Enable Blame');
	$blame_icon = 'fa-exclamation-circle';
	$blame_value = 1;
	}

	$view->addAction(
	id(new PhabricatorActionView())
	->setName($blame_text)
	->setHref($base_uri->alter('blame', $blame_value))
	->setIcon($blame_icon)
	->setUser($viewer)
	->setRenderAsForm($viewer->isLoggedIn()));

	if ($show_color) {
	$highlight_text = pht('Disable Highlighting');
	$highlight_icon = 'fa-star-o grey';
	$highlight_value = 0;
	} else {
	$highlight_text = pht('Enable Highlighting');
	$highlight_icon = 'fa-star';
	$highlight_value = 1;
	}

	$view->addAction(
	id(new PhabricatorActionView())
	->setName($highlight_text)
	->setHref($base_uri->alter('color', $highlight_value))
	->setIcon($highlight_icon)
	->setUser($viewer)
	->setRenderAsForm($viewer->isLoggedIn()));

	$href = null;
	if ($this->getRequest()->getStr('lint') !== null) {
	$lint_text = pht('Hide %d Lint Message(s)', count($this->lintMessages));
	$href = $base_uri->alter('lint', null);

	} else if ($this->lintCommit === null) {
	$lint_text = pht('Lint not Available');
	} else {
	$lint_text = pht(
	'Show %d Lint Message(s)',
	count($this->lintMessages));
	$href = $this->getDiffusionRequest()->generateURI(array(
	'action' => 'browse',
	'commit' => $this->lintCommit,
	))->alter('lint', '');
	}

	$view->addAction(
	id(new PhabricatorActionView())
	->setName($lint_text)
	->setHref($href)
	->setIcon('fa-exclamation-triangle')
	->setDisabled(!$href));

	return $view;
	}

	private function renderEditButton() {
	$request = $this->getRequest();
	$user = $request->getUser();

	$drequest = $this->getDiffusionRequest();

	$repository = $drequest->getRepository();
	$path = $drequest->getPath();
	$line = nonempty((int)$drequest->getLine(), 1);

	$callsign = $repository->getCallsign();
	$editor_link = $user->loadEditorLink($path, $line, $callsign);
	$template = $user->loadEditorLink($path, '%l', $callsign);

	$icon_edit = id(new PHUIIconView())
	->setIconFont('fa-pencil');
	$button = id(new PHUIButtonView())
	->setTag('a')
	->setText(pht('Open in Editor'))
	->setHref($editor_link)
	->setIcon($icon_edit)
	->setID('editor_link')
	->setMetadata(array('link_template' => $template))
	->setDisabled(!$editor_link);

	return $button;
	}

	private function renderFileButton($file_uri = null) {

	$base_uri = $this->getRequest()->getRequestURI();

	if ($file_uri) {
	$text = pht('Download Raw File');
	$href = $file_uri;
	$icon = 'fa-download';
	} else {
	$text = pht('View Raw File');
	$href = $base_uri->alter('view', 'raw');
	$icon = 'fa-file-text';
	}

	$iconview = id(new PHUIIconView())
	->setIconFont($icon);
	$button = id(new PHUIButtonView())
	->setTag('a')
	->setText($text)
	->setHref($href)
	->setIcon($iconview);

	return $button;
	}


	private function buildDisplayRows(
	array $text_list,
	array $rev_list,
	array $blame_dict,
	$needs_blame,
	DiffusionRequest $drequest,
	$show_blame,
	$show_color) {

	$handles = array();
	if ($blame_dict) {
	$epoch_list = ipull(ifilter($blame_dict, 'epoch'), 'epoch');
	$epoch_min = min($epoch_list);
	$epoch_max = max($epoch_list);
	$epoch_range = ($epoch_max - $epoch_min) + 1;

	$author_phids = ipull(ifilter($blame_dict, 'authorPHID'), 'authorPHID');
	$handles = $this->loadViewerHandles($author_phids);
	}

	$line_arr = array();
	$line_str = $drequest->getLine();
	$ranges = explode(',', $line_str);
	foreach ($ranges as $range) {
	if (strpos($range, '-') !== false) {
	list($min, $max) = explode('-', $range, 2);
	$line_arr[] = array(
	'min' => min($min, $max),
	'max' => max($min, $max),
	);
	} else if (strlen($range)) {
	$line_arr[] = array(
	'min' => $range,
	'max' => $range,
	);
	}
	}

	$display = array();

	$line_number = 1;
	$last_rev = null;
	$color = null;
	foreach ($text_list as $k => $line) {
	$display_line = array(
	'epoch' => null,
	'commit' => null,
	'author' => null,
	'target' => null,
	'highlighted' => null,
	'line' => $line_number,
	'data' => $line,
	);

	if ($show_blame) {
	// If the line's rev is same as the line above, show empty content
	// with same color; otherwise generate blame info. The newer a change
	// is, the more saturated the color.

	$rev = idx($rev_list, $k, $last_rev);

	if ($last_rev == $rev) {
	$display_line['color'] = $color;
	} else {
	$blame = $blame_dict[$rev];

	if (!isset($blame['epoch'])) {
	$color = '#ffd'; // Render as warning.
	} else {
	$color_ratio = ($blame['epoch'] - $epoch_min) / $epoch_range;
	$color_value = 0xE6 * (1.0 - $color_ratio);
	$color = sprintf(
	'#%02x%02x%02x',
	$color_value,
	0xF6,
	$color_value);
	}

	$display_line['epoch'] = idx($blame, 'epoch');
	$display_line['color'] = $color;
	$display_line['commit'] = $rev;

	$author_phid = idx($blame, 'authorPHID');
	if ($author_phid && $handles[$author_phid]) {
	$author_link = $handles[$author_phid]->renderLink();
	} else {
	$author_link = $blame['author'];
	}
	$display_line['author'] = $author_link;

	$last_rev = $rev;
	}
	}

	if ($line_arr) {
	if ($line_number == $line_arr[0]['min']) {
	$display_line['target'] = true;
	}
	foreach ($line_arr as $range) {
	if ($line_number >= $range['min'] &&
	$line_number <= $range['max']) {
	$display_line['highlighted'] = true;
	}
	}
	}

	$display[] = $display_line;
	++$line_number;
	}

	$request = $this->getRequest();
	$viewer = $request->getUser();

	$commits = array_filter(ipull($display, 'commit'));
	if ($commits) {
	$commits = id(new DiffusionCommitQuery())
	->setViewer($viewer)
	->withRepository($drequest->getRepository())
	->withIdentifiers($commits)
	->execute();
	$commits = mpull($commits, null, 'getCommitIdentifier');
	}

	$revision_ids = id(new DifferentialRevision())
	->loadIDsByCommitPHIDs(mpull($commits, 'getPHID'));
	$revisions = array();
	if ($revision_ids) {
	$revisions = id(new DifferentialRevisionQuery())
	->setViewer($viewer)
	->withIDs($revision_ids)
	->execute();
	}

	$phids = array();
	foreach ($commits as $commit) {
	if ($commit->getAuthorPHID()) {
	$phids[] = $commit->getAuthorPHID();
	}
	}
	foreach ($revisions as $revision) {
	if ($revision->getAuthorPHID()) {
	$phids[] = $revision->getAuthorPHID();
	}
	}
	$handles = $this->loadViewerHandles($phids);

	Javelin::initBehavior('phabricator-oncopy', array());

	$engine = null;
	$inlines = array();
	if ($this->getRequest()->getStr('lint') !== null && $this->lintMessages) {
	$engine = new PhabricatorMarkupEngine();
	$engine->setViewer($viewer);

	foreach ($this->lintMessages as $message) {
	$inline = id(new PhabricatorAuditInlineComment())
	->setID($message['id'])
	->setSyntheticAuthor(
	ArcanistLintSeverity::getStringForSeverity($message['severity']).
	' '.$message['code'].' ('.$message['name'].')')
	->setLineNumber($message['line'])
	->setContent($message['description']);
	$inlines[$message['line']][] = $inline;

	$engine->addObject(
	$inline,
	PhabricatorInlineCommentInterface::MARKUP_FIELD_BODY);
	}

	$engine->process();
	require_celerity_resource('differential-changeset-view-css');
	}

	$rows = $this->renderInlines(
	idx($inlines, 0, array()),
	$show_blame,
	(bool)$this->coverage,
	$engine);

	foreach ($display as $line) {

	$line_href = $drequest->generateURI(
	array(
	'action' => 'browse',
	'line' => $line['line'],
	'stable' => true,
	));

	$blame = array();
	$style = null;
	if (array_key_exists('color', $line)) {
	if ($line['color']) {
	$style = 'background: '.$line['color'].';';
	}

	$before_link = null;
	$commit_link = null;
	$revision_link = null;
	if (idx($line, 'commit')) {
	$commit = $line['commit'];

	if (idx($commits, $commit)) {
	$tooltip = $this->renderCommitTooltip(
	$commits[$commit],
	$handles,
	$line['author']);
	} else {
	$tooltip = null;
	}

	Javelin::initBehavior('phabricator-tooltips', array());
	require_celerity_resource('aphront-tooltip-css');

	$commit_link = javelin_tag(
	'a',
	array(
	'href' => $drequest->generateURI(
	array(
	'action' => 'commit',
	'commit' => $line['commit'],
	)),
	'sigil' => 'has-tooltip',
	'meta' => array(
	'tip' => $tooltip,
	'align' => 'E',
	'size' => 600,
	),
	),
	phutil_utf8_shorten($line['commit'], 9, ''));

	$revision_id = null;
	if (idx($commits, $commit)) {
	$revision_id = idx($revision_ids, $commits[$commit]->getPHID());
	}

	if ($revision_id) {
	$revision = idx($revisions, $revision_id);
	if ($revision) {
	$tooltip = $this->renderRevisionTooltip($revision, $handles);
	$revision_link = javelin_tag(
	'a',
	array(
	'href' => '/D'.$revision->getID(),
	'sigil' => 'has-tooltip',
	'meta' => array(
	'tip' => $tooltip,
	'align' => 'E',
	'size' => 600,
	),
	),
	'D'.$revision->getID());
	}
	}

	$uri = $line_href->alter('before', $commit);
	$before_link = javelin_tag(
	'a',
	array(
	'href' => $uri->setQueryParam('view', 'blame'),
	'sigil' => 'has-tooltip',
	'meta' => array(
	'tip' => pht('Skip Past This Commit'),
	'align' => 'E',
	'size' => 300,
	),
	),
	"\xC2\xAB");
	}

	$blame[] = phutil_tag(
	'th',
	array(
	'class' => 'diffusion-blame-link',
	),
	$before_link);

	$object_links = array();
	$object_links[] = $commit_link;
	if ($revision_link) {
	$object_links[] = phutil_tag('span', array(), '/');
	$object_links[] = $revision_link;
	}

	$blame[] = phutil_tag(
	'th',
	array(
	'class' => 'diffusion-rev-link',
	),
	$object_links);
	}

	$line_link = phutil_tag(
	'a',
	array(
	'href' => $line_href,
	'style' => $style,
	),
	$line['line']);

	$blame[] = javelin_tag(
	'th',
	array(
	'class' => 'diffusion-line-link',
	'sigil' => 'phabricator-source-line',
	'style' => $style,
	),
	$line_link);

	Javelin::initBehavior('phabricator-line-linker');

	if ($line['target']) {
	Javelin::initBehavior(
	'diffusion-jump-to',
	array(
	'target' => 'scroll_target',
	));
	$anchor_text = phutil_tag(
	'a',
	array(
	'id' => 'scroll_target',
	),
	'');
	} else {
	$anchor_text = null;
	}

	$blame[] = phutil_tag(
	'td',
	array(
	),
	array(
	$anchor_text,

	// NOTE: See phabricator-oncopy behavior.
	"\xE2\x80\x8B",

	// TODO: [HTML] Not ideal.
	phutil_safe_html(str_replace("\t", ' ', $line['data'])),
	));

	if ($this->coverage) {
	require_celerity_resource('differential-changeset-view-css');
	$cov_index = $line['line'] - 1;

	if (isset($this->coverage[$cov_index])) {
	$cov_class = $this->coverage[$cov_index];
	} else {
	$cov_class = 'N';
	}

	$blame[] = phutil_tag(
	'td',
	array(
	'class' => 'cov cov-'.$cov_class,
	),
	'');
	}

	$rows[] = phutil_tag(
	'tr',
	array(
	'class' => ($line['highlighted'] ?
	'phabricator-source-highlight' :
	null),
	),
	$blame);

	$cur_inlines = $this->renderInlines(
	idx($inlines, $line['line'], array()),
	$show_blame,
	$this->coverage,
	$engine);
	foreach ($cur_inlines as $cur_inline) {
	$rows[] = $cur_inline;
	}
	}

	return $rows;
	}

	private function renderInlines(
	array $inlines,
	$needs_blame,
	$has_coverage,
	$engine) {

	$rows = array();
	foreach ($inlines as $inline) {
	$inline_view = id(new DifferentialInlineCommentView())
	->setMarkupEngine($engine)
	->setInlineComment($inline)
	->render();

	$row = array_fill(0, ($needs_blame ? 3 : 1), phutil_tag('th'));

	$row[] = phutil_tag('td', array(), $inline_view);

	if ($has_coverage) {
	$row[] = phutil_tag(
	'td',
	array(
	'class' => 'cov cov-I',
	));
	}

	$rows[] = phutil_tag('tr', array('class' => 'inline'), $row);
	}

	return $rows;
	}

	private function loadFileForData($path, $data) {
	$file = PhabricatorFile::buildFromFileDataOrHash(
	$data,
	array(
	'name' => basename($path),
	'ttl' => time() + 60 * 60 * 24,
	'viewPolicy' => PhabricatorPolicies::POLICY_NOONE,
	));

	$unguarded = AphrontWriteGuard::beginScopedUnguardedWrites();
	$file->attachToObject(
	$this->getRequest()->getUser(),
	$this->getDiffusionRequest()->getRepository()->getPHID());
	unset($unguarded);

	return $file;
	}

	private function buildRawResponse($path, $data) {
	$file = $this->loadFileForData($path, $data);
	return id(new AphrontRedirectResponse())->setURI($file->getBestURI());
	}

	private function buildImageCorpus($file_uri) {
	$properties = new PHUIPropertyListView();

	$properties->addImageContent(
	phutil_tag(
	'img',
	array(
	'src' => $file_uri,
	)));

	$file = $this->renderFileButton($file_uri);
	$header = id(new PHUIHeaderView())
	->setHeader(pht('Image'))
	->addActionLink($file);

	return id(new PHUIObjectBoxView())
	->setHeader($header)
	->addPropertyList($properties);
	}

	private function buildBinaryCorpus($file_uri, $data) {

	$size = new PhutilNumber(strlen($data));
	$text = pht('This is a binary file. It is %s byte(s) in length.', $size);
	$text = id(new PHUIBoxView())
	->addPadding(PHUI::PADDING_LARGE)
	->appendChild($text);

	$file = $this->renderFileButton($file_uri);
	$header = id(new PHUIHeaderView())
	->setHeader(pht('Details'))
	->addActionLink($file);

	$box = id(new PHUIObjectBoxView())
	->setHeader($header)
	->appendChild($text);

	return $box;
	}

	private function buildBeforeResponse($before) {
	$request = $this->getRequest();
	$drequest = $this->getDiffusionRequest();

	// NOTE: We need to get the grandparent so we can capture filename changes
	// in the parent.

	$parent = $this->loadParentCommitOf($before);
	$old_filename = null;
	$was_created = false;
	if ($parent) {
	$grandparent = $this->loadParentCommitOf($parent);

	if ($grandparent) {
	$rename_query = new DiffusionRenameHistoryQuery();
	$rename_query->setRequest($drequest);
	$rename_query->setOldCommit($grandparent);
	$rename_query->setViewer($request->getUser());
	$old_filename = $rename_query->loadOldFilename();
	$was_created = $rename_query->getWasCreated();
	}
	}

	$follow = null;
	if ($was_created) {
	// If the file was created in history, that means older commits won't
	// have it. Since we know it existed at 'before', it must have been
	// created then; jump there.
	$target_commit = $before;
	$follow = 'created';
	} else if ($parent) {
	// If we found a parent, jump to it. This is the normal case.
	$target_commit = $parent;
	} else {
	// If there's no parent, this was probably created in the initial commit?
	// And the "was_created" check will fail because we can't identify the
	// grandparent. Keep the user at 'before'.
	$target_commit = $before;
	$follow = 'first';
	}

	$path = $drequest->getPath();
	$renamed = null;
	if ($old_filename !== null &&
	$old_filename !== '/'.$path) {
	$renamed = $path;
	$path = $old_filename;
	}

	$line = null;
	// If there's a follow error, drop the line so the user sees the message.
	if (!$follow) {
	$line = $this->getBeforeLineNumber($target_commit);
	}

	$before_uri = $drequest->generateURI(
	array(
	'action' => 'browse',
	'commit' => $target_commit,
	'line' => $line,
	'path' => $path,
	));

	$before_uri->setQueryParams($request->getRequestURI()->getQueryParams());
	$before_uri = $before_uri->alter('before', null);
	$before_uri = $before_uri->alter('renamed', $renamed);
	$before_uri = $before_uri->alter('follow', $follow);

	return id(new AphrontRedirectResponse())->setURI($before_uri);
	}

	private function getBeforeLineNumber($target_commit) {
	$drequest = $this->getDiffusionRequest();

	$line = $drequest->getLine();
	if (!$line) {
	return null;
	}

	$raw_diff = $this->callConduitWithDiffusionRequest(
	'diffusion.rawdiffquery',
	array(
	'commit' => $drequest->getCommit(),
	'path' => $drequest->getPath(),
	'againstCommit' => $target_commit));
	$old_line = 0;
	$new_line = 0;

	foreach (explode("\n", $raw_diff) as $text) {
	if ($text[0] == '-' \|\| $text[0] == ' ') {
	$old_line++;
	}
	if ($text[0] == '+' \|\| $text[0] == ' ') {
	$new_line++;
	}
	if ($new_line == $line) {
	return $old_line;
	}
	}

	// We didn't find the target line.
	return $line;
	}

	private function loadParentCommitOf($commit) {
	$drequest = $this->getDiffusionRequest();
	$user = $this->getRequest()->getUser();

	$before_req = DiffusionRequest::newFromDictionary(
	array(
	'user' => $user,
	'repository' => $drequest->getRepository(),
	'commit' => $commit,
	));

	$parents = DiffusionQuery::callConduitWithDiffusionRequest(
	$user,
	$before_req,
	'diffusion.commitparentsquery',
	array(
	'commit' => $commit,
	));

	return head($parents);
	}

	private function renderRevisionTooltip(
	DifferentialRevision $revision,
	array $handles) {
	$viewer = $this->getRequest()->getUser();

	$date = phabricator_date($revision->getDateModified(), $viewer);
	$id = $revision->getID();
	$title = $revision->getTitle();
	$header = "D{$id} {$title}";

	$author = $handles[$revision->getAuthorPHID()]->getName();

	return "{$header}\n{$date} \xC2\xB7 {$author}";
	}

	private function renderCommitTooltip(
	PhabricatorRepositoryCommit $commit,
	array $handles,
	$author) {

	$viewer = $this->getRequest()->getUser();

	$date = phabricator_date($commit->getEpoch(), $viewer);
	$summary = trim($commit->getSummary());

	if ($commit->getAuthorPHID()) {
	$author = $handles[$commit->getAuthorPHID()]->getName();
	}

	return "{$summary}\n{$date} \xC2\xB7 {$author}";
	}

	}

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