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phab/src/applications/diffusion/query/lowlevel/DiffusionLowLevelGitRefQuery.php
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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 $isTag;
private $isOriginBranch;
public function withIsTag($is_tag) {
$this->isTag = $is_tag;
return $this;
}
public function withIsOriginBranch($is_origin_branch) {
$this->isOriginBranch = $is_origin_branch;
return $this;
}
protected function executeQuery() {
$repository = $this->getRepository();
$prefixes = array();
$any = ($this->isTag || $this->isOriginBranch);
if (!$any) {
throw new Exception(pht('Specify types of refs to query.'));
}
if ($this->isOriginBranch) {
if ($repository->isWorkingCopyBare()) {
$prefix = 'refs/heads/';
} else {
$remote = DiffusionGitBranch::DEFAULT_GIT_REMOTE;
$prefix = 'refs/remotes/'.$remote.'/';
}
$prefixes[] = $prefix;
}
if ($this->isTag) {
$prefixes[] = 'refs/tags/';
}
$order = '-creatordate';
$futures = array();
foreach ($prefixes as $prefix) {
$futures[$prefix] = $repository->getLocalCommandFuture(
'for-each-ref --sort=%s --format=%s %s',
$order,
$this->getFormatString(),
$prefix);
}
// Resolve all the futures first. We want to iterate over them in prefix
// order, not resolution order.
foreach (new FutureIterator($futures) as $prefix => $future) {
$future->resolvex();
}
$results = array();
foreach ($futures as $prefix => $future) {
list($stdout) = $future->resolvex();
$stdout = rtrim($stdout);
if (!strlen($stdout)) {
continue;
}
// 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", $stdout);
foreach ($lines as $line) {
$fields = $this->extractFields($line);
$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']);
$short = substr($fields['refname'], strlen($prefix));
if ($short == 'HEAD') {
continue;
}
$ref = id(new DiffusionRepositoryRef())
->setShortName($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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