ArcanistPrompt.php
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	<?php

	final class ArcanistPrompt
	extends Phobject {

	private $key;
	private $workflow;
	private $description;
	private $query;

	public function setKey($key) {
	$this->key = $key;
	return $this;
	}

	public function getKey() {
	return $this->key;
	}

	public function setWorkflow(ArcanistWorkflow $workflow) {
	$this->workflow = $workflow;
	return $this;
	}

	public function getWorkflow() {
	return $this->workflow;
	}

	public function setDescription($description) {
	$this->description = $description;
	return $this;
	}

	public function getDescription() {
	return $this->description;
	}

	public function setQuery($query) {
	$this->query = $query;
	return $this;
	}

	public function getQuery() {
	return $this->query;
	}

	public function execute() {
	$workflow = $this->getWorkflow();
	if ($workflow) {
	$workflow_ok = $workflow->hasPrompt($this->getKey());
	} else {
	$workflow_ok = false;
	}

	if (!$workflow_ok) {
	throw new Exception(
	pht(
	'Prompt ("%s") is executing, but it is not properly bound to the '.
	'invoking workflow. You may have called "newPrompt()" to execute a '.
	'prompt instead of "getPrompt()". Use "newPrompt()" when defining '.
	'prompts and "getPrompt()" when executing them.',
	$this->getKey()));
	}

	$query = $this->getQuery();
	if (!strlen($query)) {
	throw new Exception(
	pht(
	'Prompt ("%s") has no query text!',
	$this->getKey()));
	}

	$options = '[y/N]';
	$default = 'N';

	try {
	phutil_console_require_tty();
	} catch (PhutilConsoleStdinNotInteractiveException $ex) {
	// TOOLSETS: Clean this up to provide more details to the user about how
	// they can configure prompts to be answered.

	// Throw after echoing the prompt so the user has some idea what happened.
	echo $query."\n";
	throw $ex;
	}

	// NOTE: We're making stdin nonblocking so that we can respond to signals
	// immediately. If we don't, and you ^C during a prompt, the program does
	// not handle the signal until fgets() returns.

	$stdin = fopen('php://stdin', 'r');
	if (!$stdin) {
	throw new Exception(pht('Failed to open stdin for reading.'));
	}

	$ok = stream_set_blocking($stdin, false);
	if (!$ok) {
	throw new Exception(pht('Unable to set stdin nonblocking.'));
	}

	echo "\n";

	$result = null;
	while (true) {
	echo tsprintf(
	'<bg:cyan> %s </bg> %s %s ',
	'>>>',
	$query,
	$options);

	while (true) {
	$read = array($stdin);
	$write = array();
	$except = array();

	$ok = @stream_select($read, $write, $except, 1);
	if ($ok === false) {
	// NOTE: We may be interrupted by a system call, particularly if
	// the window is resized while a prompt is shown and the terminal
	// sends SIGWINCH.

	// If we are, just continue below and try to read from stdin. If
	// we were interrupted, we should read nothing and continue
	// normally. If the pipe is broken, the read should fail.
	}

	$response = '';
	while (true) {
	$bytes = fread($stdin, 8192);
	if ($bytes === false) {
	throw new Exception(
	pht('fread() from stdin failed with an error.'));
	}

	if (!strlen($bytes)) {
	break;
	}

	$response .= $bytes;
	}

	if (!strlen($response)) {
	continue;
	}

	break;
	}

	$response = trim($response);
	if (!strlen($response)) {
	$response = $default;
	}

	if (phutil_utf8_strtolower($response) == 'y') {
	$result = true;
	break;
	}

	if (phutil_utf8_strtolower($response) == 'n') {
	$result = false;
	break;
	}
	}

	if (!$result) {
	throw new ArcanistUserAbortException();
	}

	}

	}

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