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PhabricatorGitGraphStream.php
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Created
Tue, Nov 19, 01:18

PhabricatorGitGraphStream.php
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<?php
final class PhabricatorGitGraphStream
extends PhabricatorRepositoryGraphStream {
private $repository;
private $iterator;
private $startCommit;
private $parents = array();
private $dates = array();
public function __construct(
PhabricatorRepository $repository,
$start_commit = null) {
$this->repository = $repository;
$this->startCommit = $start_commit;
if ($start_commit !== null) {
$future = $repository->getLocalCommandFuture(
'log --format=%s %s --',
'%H%x01%P%x01%ct',
$start_commit);
} else {
$future = $repository->getLocalCommandFuture(
'log --format=%s --all --',
'%H%x01%P%x01%ct');
}
$this->iterator = new LinesOfALargeExecFuture($future);
$this->iterator->setDelimiter("\n");
$this->iterator->rewind();
}
public function getParents($commit) {
if (!isset($this->parents[$commit])) {
$this->parseUntil($commit);
}
$parents = $this->parents[$commit];
// NOTE: In Git, it is possible for a commit to list the same parent more
// than once. See T5226. Discard duplicate parents.
return array_unique($parents);
}
public function getCommitDate($commit) {
if (!isset($this->dates[$commit])) {
$this->parseUntil($commit);
}
return $this->dates[$commit];
}
private function parseUntil($commit) {
if ($this->isParsed($commit)) {
return;
}
$gitlog = $this->iterator;
while ($gitlog->valid()) {
$line = $gitlog->current();
$gitlog->next();
$line = trim($line);
if (!strlen($line)) {
break;
}
list($hash, $parents, $epoch) = explode("\1", $line);
if ($parents) {
$parents = explode(' ', $parents);
} else {
// First commit.
$parents = array();
}
$this->dates[$hash] = $epoch;
$this->parents[$hash] = $parents;
if ($this->isParsed($commit)) {
return;
}
}
if ($this->startCommit !== null) {
throw new Exception(
pht(
'Commit "%s" is not a reachable ancestor of "%s".',
$commit,
$this->startCommit));
} else {
throw new Exception(
pht(
'Commit "%s" is not a reachable ancestor of any ref.',
$commit));
}
}
private function isParsed($commit) {
return isset($this->dates[$commit]);
}
}

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