ArcanistGitLocalState.php
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	<?php

	final class ArcanistGitLocalState
	extends ArcanistRepositoryLocalState {

	private $localCommit;
	private $localRef;
	private $localPath;

	public function getLocalRef() {
	return $this->localRef;
	}

	public function getLocalPath() {
	return $this->localPath;
	}

	protected function executeSaveLocalState() {
	$api = $this->getRepositoryAPI();

	$commit = $api->getWorkingCopyRevision();

	list($ref) = $api->execxLocal('rev-parse --abbrev-ref HEAD');
	$ref = trim($ref);
	if ($ref === 'HEAD') {
	$ref = null;
	$where = pht(
	'Saving local state (at detached commit "%s").',
	$api->getDisplayHash($commit));
	} else {
	$where = pht(
	'Saving local state (on ref "%s" at commit "%s").',
	$ref,
	$api->getDisplayHash($commit));
	}

	$this->localRef = $ref;
	$this->localCommit = $commit;

	if ($ref !== null) {
	$this->localPath = $api->getPathToUpstream($ref);
	}

	$log = $this->getWorkflow()->getLogEngine();
	$log->writeTrace(pht('SAVE STATE'), $where);
	}

	protected function executeRestoreLocalState() {
	$api = $this->getRepositoryAPI();
	$log = $this->getWorkflow()->getLogEngine();

	$ref = $this->localRef;
	$commit = $this->localCommit;

	if ($ref !== null) {
	$where = pht(
	'Restoring local state (to ref "%s" at commit "%s").',
	$ref,
	$api->getDisplayHash($commit));
	} else {
	$where = pht(
	'Restoring local state (to detached commit "%s").',
	$api->getDisplayHash($commit));
	}

	$log->writeStatus(pht('LOAD STATE'), $where);

	if ($ref !== null) {
	$api->execxLocal('checkout -B %s %s --', $ref, $commit);

	// TODO: We save, but do not restore, the upstream configuration of
	// this branch.

	} else {
	$api->execxLocal('checkout %s --', $commit);
	}

	$api->execxLocal('submodule update --init --recursive');
	}

	protected function executeDiscardLocalState() {
	// We don't have anything to clean up in Git.
	return;
	}

	protected function newRestoreCommandsForDisplay() {
	$api = $this->getRepositoryAPI();
	$ref = $this->localRef;
	$commit = $this->localCommit;

	$commands = array();

	if ($ref !== null) {
	$commands[] = csprintf(
	'git checkout -B %s %s --',
	$ref,
	$api->getDisplayHash($commit));
	} else {
	$commands[] = csprintf(
	'git checkout %s --',
	$api->getDisplayHash($commit));
	}

	// NOTE: We run "submodule update" in the real restore workflow, but
	// assume users can reasonably figure that out on their own.

	return $commands;
	}

	protected function canStashChanges() {
	return true;
	}

	protected function getIgnoreHints() {
	return array(
	pht(
	'To configure Git to ignore certain files in this working copy, '.
	'add the file paths to "%s".',
	'.git/info/exclude'),
	);
	}

	protected function saveStash() {
	$api = $this->getRepositoryAPI();

	// NOTE: We'd prefer to "git stash create" here, because using "push"
	// and "pop" means we're affecting the stash list as a side effect.

	// However, under Git 2.21.1, "git stash create" exits with no output,
	// no error, and no effect if the working copy contains only untracked
	// files. For now, accept mutations to the stash list.

	$api->execxLocal('stash push --include-untracked --');

	$log = $this->getWorkflow()->getLogEngine();
	$log->writeStatus(
	pht('SAVE STASH'),
	pht('Saved uncommitted changes from working copy.'));

	return true;
	}

	protected function restoreStash($stash_ref) {
	$api = $this->getRepositoryAPI();

	$log = $this->getWorkflow()->getLogEngine();
	$log->writeStatus(
	pht('LOAD STASH'),
	pht('Restoring uncommitted changes to working copy.'));

	// NOTE: Under Git 2.21.1, "git stash apply" does not accept "--".
	$api->execxLocal('stash apply');
	}

	protected function discardStash($stash_ref) {
	$api = $this->getRepositoryAPI();

	// NOTE: Under Git 2.21.1, "git stash drop" does not accept "--".
	$api->execxLocal('stash drop');
	}

	private function getDisplayStashRef($stash_ref) {
	return substr($stash_ref, 0, 12);
	}

	}

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