DiffusionLowLevelGitRefQuery.php
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	<?php

	/**
	* Execute and parse a low-level Git ref query using `git for-each-ref`. This
	* is useful for returning a list of tags or branches.
	*/
	final class DiffusionLowLevelGitRefQuery extends DiffusionLowLevelQuery {

	private $refTypes;

	public function withRefTypes(array $ref_types) {
	$this->refTypes = $ref_types;
	return $this;
	}

	protected function executeQuery() {
	$type_branch = PhabricatorRepositoryRefCursor::TYPE_BRANCH;
	$type_tag = PhabricatorRepositoryRefCursor::TYPE_TAG;
	$type_ref = PhabricatorRepositoryRefCursor::TYPE_REF;

	$ref_types = $this->refTypes;
	if (!$ref_types) {
	$ref_types = array($type_branch, $type_tag, $type_ref);
	}

	$ref_types = array_fuse($ref_types);

	$with_branches = isset($ref_types[$type_branch]);
	$with_tags = isset($ref_types[$type_tag]);
	$with_refs = isset($ref_types[$type_ref]);

	$repository = $this->getRepository();

	$prefixes = array();

	$branch_prefix = 'refs/heads/';
	$tag_prefix = 'refs/tags/';

	if ($with_refs \|\| count($ref_types) > 1) {
	// If we're loading refs or more than one type of ref, just query
	// everything.
	$prefix = 'refs/';
	} else {
	if ($with_branches) {
	$prefix = $branch_prefix;
	}
	if ($with_tags) {
	$prefix = $tag_prefix;
	}
	}

	$branch_len = strlen($branch_prefix);
	$tag_len = strlen($tag_prefix);

	list($stdout) = $repository->execxLocalCommand(
	'for-each-ref --sort=%s --format=%s -- %s',
	'-creatordate',
	$this->getFormatString(),
	$prefix);

	$stdout = rtrim($stdout);
	if (!strlen($stdout)) {
	return array();
	}

	$remote_prefix = 'refs/remotes/';
	$remote_len = strlen($remote_prefix);

	// NOTE: Although git supports --count, we can't apply any offset or
	// limit logic until the very end because we may encounter a HEAD which
	// we want to discard.

	$lines = explode("\n", $stdout);
	$results = array();
	foreach ($lines as $line) {
	$fields = $this->extractFields($line);

	$refname = $fields['refname'];
	if (!strncmp($refname, $branch_prefix, $branch_len)) {
	$short = substr($refname, $branch_len);
	$type = $type_branch;
	} else if (!strncmp($refname, $tag_prefix, $tag_len)) {
	$short = substr($refname, $tag_len);
	$type = $type_tag;
	} else if (!strncmp($refname, $remote_prefix, $remote_len)) {
	// If we've found a remote ref that we didn't recognize as naming a
	// branch, just ignore it. This can happen if we're observing a remote,
	// and that remote has its own remotes. We don't care about their
	// state and they may be out of date, so ignore them.
	continue;
	} else {
	$short = $refname;
	$type = $type_ref;
	}

	// If this isn't a type of ref we care about, skip it.
	if (empty($ref_types[$type])) {
	continue;
	}

	// If this is the local HEAD, skip it.
	if ($short == 'HEAD') {
	continue;
	}

	$creator = $fields['creator'];
	$matches = null;
	if (preg_match('/^(.*) ([0-9]+) ([0-9+-]+)$/', $creator, $matches)) {
	$fields['author'] = $matches[1];
	$fields['epoch'] = (int)$matches[2];
	} else {
	$fields['author'] = null;
	$fields['epoch'] = null;
	}

	$commit = nonempty($fields['*objectname'], $fields['objectname']);

	$ref = id(new DiffusionRepositoryRef())
	->setRefType($type)
	->setShortName($short)
	->setCommitIdentifier($commit)
	->setRawFields($fields);

	$results[] = $ref;
	}

	return $results;
	}

	/**
	* List of git `--format` fields we want to grab.
	*/
	private function getFields() {
	return array(
	'objectname',
	'objecttype',
	'refname',
	'*objectname',
	'*objecttype',
	'subject',
	'creator',
	);
	}

	/**
	* Get a string for `--format` which enumerates all the fields we want.
	*/
	private function getFormatString() {
	$fields = $this->getFields();

	foreach ($fields as $key => $field) {
	$fields[$key] = '%('.$field.')';
	}

	return implode('%01', $fields);
	}

	/**
	* Parse a line back into fields.
	*/
	private function extractFields($line) {
	$fields = $this->getFields();
	$parts = explode("\1", $line, count($fields));

	$dict = array();
	foreach ($fields as $index => $field) {
	$dict[$field] = idx($parts, $index);
	}

	return $dict;
	}

	}

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