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PhutilConsole.php
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Thu, May 9, 09:10

PhutilConsole.php
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<?php
/*
* Copyright 2012 Facebook, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/**
* Provides access to the command-line console. Instead of reading from or
* writing to stdin/stdout/stderr directly, this class provides a richer API
* including support for ANSI color and formatting, convenience methods for
* prompting the user, and the ability to interact with stdin/stdout/stderr
* in some other process instead of this one.
*
* @task construct Construction
* @task interface Interfacing with the User
* @task internal Internals
* @group console
*/
final class PhutilConsole {
private static $console;
private $server;
private $channel;
private $messages = array();
/* -( Console Construction )----------------------------------------------- */
/**
* Use @{method:newLocalConsole} or @{method:newRemoteConsole} to construct
* new consoles.
*
* @task construct
*/
private function __construct() {
// <private>
}
/**
* Get the current console. If there's no active console, a new local console
* is created (see @{method:newLocalConsole} for details). You can change the
* active console with @{method:setConsole}.
*
* @return PhutilConsole Active console.
* @task construct
*/
public static function getConsole() {
if (empty(self::$console)) {
self::setConsole(self::newLocalConsole());
}
return self::$console;
}
/**
* Set the active console.
*
* @param PhutilConsole
* @return void
* @task construct
*/
public static function setConsole(PhutilConsole $console) {
self::$console = $console;
}
/**
* Create a new console attached to stdin/stdout/stderr of this process.
* This is how consoles normally work -- for instance, writing output with
* @{method:writeOut} prints directly to stdout. If you don't create a
* console explicitly, a new local console is created for you.
*
* @return PhutilConsole A new console which operates on the pipes of this
* process.
* @task construct
*/
public static function newLocalConsole() {
$console = new PhutilConsole();
$console->server = new PhutilConsoleServer();
return $console;
}
public static function newRemoteConsole() {
$io_channel = new PhutilSocketChannel(
fopen('php://stdin', 'r'),
fopen('php://stdout', 'w'));
$protocol_channel = new PhutilPHPObjectProtocolChannel($io_channel);
$console = new PhutilConsole();
$console->channel = $protocol_channel;
return $console;
}
/* -( Interfacing with the User )------------------------------------------ */
public function confirm($prompt, $default = false) {
$message = id(new PhutilConsoleMessage())
->setType(PhutilConsoleMessage::TYPE_CONFIRM)
->setData(
array(
'prompt' => $prompt,
'default' => $default,
));
$this->writeMessage($message);
$response = $this->waitForMessage();
return $response->getData();
}
public function writeOut($pattern /*, ... */) {
$args = func_get_args();
return $this->writeTextMessage(PhutilConsoleMessage::TYPE_OUT, $args);
}
public function writeErr($pattern /*, ... */) {
$args = func_get_args();
return $this->writeTextMessage(PhutilConsoleMessage::TYPE_ERR, $args);
}
/* -( Internals )---------------------------------------------------------- */
private function writeTextMessage($type, array $argv) {
$message = id(new PhutilConsoleMessage())
->setType($type)
->setData($argv);
$this->writeMessage($message);
return $this;
}
private function writeMessage(PhutilConsoleMessage $message) {
if ($this->channel) {
$this->channel->write($message);
$this->channel->flush();
} else {
$response = $this->server->handleMessage($message);
if ($response) {
$this->messages[] = $response;
}
}
return $this;
}
private function waitForMessage() {
if ($this->channel) {
$message = $this->channel->waitForMessage();
} else if ($this->messages) {
$message = array_shift($this->messages);
} else {
throw new Exception("waitForMessage() called with no messages!");
}
return $message;
}
}

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