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phab/src/applications/diffusion/query/history/DiffusionMercurialHistoryQuery.php
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DiffusionMercurialHistoryQuery.php
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<?php
final class DiffusionMercurialHistoryQuery extends DiffusionHistoryQuery {
protected function executeQuery() {
$drequest = $this->getRequest();
$repository = $drequest->getRepository();
$path = $drequest->getPath();
$commit_hash = $drequest->getStableCommitName();
$path = DiffusionPathIDQuery::normalizePath($path);
$path = ltrim($path, '/');
// NOTE: Older versions of Mercurial give different results for these
// commands (see T1268):
//
// $ hg log -- ''
// $ hg log
//
// All versions of Mercurial give different results for these commands
// (merge commits are excluded with the "." version):
//
// $ hg log -- .
// $ hg log
//
// If we don't have a path component in the query, omit it from the command
// entirely to avoid these inconsistencies.
// NOTE: When viewing the history of a file, we don't use "-b", because
// Mercurial stops history at the branchpoint but we're interested in all
// ancestors. When viewing history of a branch, we do use "-b", and thus
// stop history (this is more consistent with the Mercurial worldview of
// branches).
if (strlen($path)) {
$path_arg = csprintf('-- %s', $path);
$branch_arg = '';
} else {
$path_arg = '';
// NOTE: --branch used to be called --only-branch; use -b for
// compatibility.
$branch_arg = csprintf('-b %s', $drequest->getBranch());
}
list($stdout) = $repository->execxLocalCommand(
'log --debug --template %s --limit %d %C --rev %s::0 %C',
'{node};{parents}\\n',
($this->getOffset() + $this->getLimit()), // No '--skip' in Mercurial.
$branch_arg,
$commit_hash,
$path_arg);
$lines = explode("\n", trim($stdout));
$lines = array_slice($lines, $this->getOffset());
$hash_list = array();
$parent_map = array();
$last = null;
foreach (array_reverse($lines) as $line) {
list($hash, $parents) = explode(';', $line);
$parents = trim($parents);
if (!$parents) {
if ($last === null) {
$parent_map[$hash] = array('...');
} else {
$parent_map[$hash] = array($last);
}
} else {
$parents = preg_split('/\s+/', $parents);
foreach ($parents as $parent) {
list($plocal, $phash) = explode(':', $parent);
if (!preg_match('/^0+$/', $phash)) {
$parent_map[$hash][] = $phash;
}
}
// This may happen for the zeroth commit in repository, both hashes
// are "000000000...".
if (empty($parent_map[$hash])) {
$parent_map[$hash] = array('...');
}
}
// The rendering code expects the first commit to be "mainline", like
// Git. Flip the order so it does the right thing.
$parent_map[$hash] = array_reverse($parent_map[$hash]);
$hash_list[] = $hash;
$last = $hash;
}
$hash_list = array_reverse($hash_list);
$this->parents = $parent_map;
return $this->loadHistoryForCommitIdentifiers($hash_list);
}
}
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