<?php
/*
* This file is part of the Symfony package.
*
* (c) Fabien Potencier <fabien@symfony.com>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace Symfony\Component\Console;
use Symfony\Component\Console\Input\StringInput;
use Symfony\Component\Console\Output\ConsoleOutput;
use Symfony\Component\Process\ProcessBuilder;
use Symfony\Component\Process\PhpExecutableFinder;
/**
* A Shell wraps an Application to add shell capabilities to it.
*
* Support for history and completion only works with a PHP compiled
* with readline support (either --with-readline or --with-libedit)
*
* @author Fabien Potencier <fabien@symfony.com>
* @author Martin Hasoň <martin.hason@gmail.com>
*/
class Shell
{
private $application;
private $history;
private $output;
private $hasReadline;
private $processIsolation = false;
/**
* Constructor.
*
* If there is no readline support for the current PHP executable
* a \RuntimeException exception is thrown.
*
* @param Application $application An application instance
*/
public function __construct(Application $application)
{
$this->hasReadline = function_exists('readline');
$this->application = $application;
$this->history = getenv('HOME').'/.history_'.$application->getName();
$this->output = new ConsoleOutput();
}
/**
* Runs the shell.
*/
public function run()
{
$this->application->setAutoExit(false);
$this->application->setCatchExceptions(true);
if ($this->hasReadline) {
readline_read_history($this->history);
readline_completion_function(array($this, 'autocompleter'));
}
$this->output->writeln($this->getHeader());
$php = null;
if ($this->processIsolation) {
$finder = new PhpExecutableFinder();
$php = $finder->find();
$this->output->writeln(<<<EOF
<info>Running with process isolation, you should consider this:</info>
* each command is executed as separate process,
* commands don't support interactivity, all params must be passed explicitly,
* commands output is not colorized.
EOF
);
}
while (true) {
$command = $this->readline();
if (false === $command) {
$this->output->writeln("\n");
break;
}
if ($this->hasReadline) {
readline_add_history($command);
readline_write_history($this->history);
}
if ($this->processIsolation) {
$pb = new ProcessBuilder();
$process = $pb
->add($php)
->add($_SERVER['argv'][0])
->add($command)
->inheritEnvironmentVariables(true)
->getProcess()
;
$output = $this->output;
$process->run(function ($type, $data) use ($output) {
$output->writeln($data);
});
$ret = $process->getExitCode();
} else {
$ret = $this->application->run(new StringInput($command), $this->output);
}
if (0 !== $ret) {
$this->output->writeln(sprintf('<error>The command terminated with an error status (%s)</error>', $ret));
}
}
}
/**
* Returns the shell header.
*
* @return string The header string
*/
protected function getHeader()
{
return <<<EOF
Welcome to the <info>{$this->application->getName()}</info> shell (<comment>{$this->application->getVersion()}</comment>).
At the prompt, type <comment>help</comment> for some help,
or <comment>list</comment> to get a list of available commands.
To exit the shell, type <comment>^D</comment>.
EOF;
}
/**
* Renders a prompt.
*
* @return string The prompt
*/
protected function getPrompt()
{
// using the formatter here is required when using readline
return $this->output->getFormatter()->format($this->application->getName().' > ');
}
protected function getOutput()
{
return $this->output;
}
protected function getApplication()
{
return $this->application;
}
/**
* Tries to return autocompletion for the current entered text.
*
* @param string $text The last segment of the entered text
*
* @return Boolean|array A list of guessed strings or true
*/
private function autocompleter($text)
{
$info = readline_info();
$text = substr($info['line_buffer'], 0, $info['end']);
if ($info['point'] !== $info['end']) {
return true;
}
// task name?
if (false === strpos($text, ' ') || !$text) {
return array_keys($this->application->all());
}
// options and arguments?
try {
$command = $this->application->find(substr($text, 0, strpos($text, ' ')));
} catch (\Exception $e) {
return true;
}
$list = array('--help');
foreach ($command->getDefinition()->getOptions() as $option) {
$list[] = '--'.$option->getName();
}
return $list;
}
/**
* Reads a single line from standard input.
*
* @return string The single line from standard input
*/
private function readline()
{
if ($this->hasReadline) {
$line = readline($this->getPrompt());
} else {
$this->output->write($this->getPrompt());
$line = fgets(STDIN, 1024);
$line = (!$line && strlen($line) == 0) ? false : rtrim($line);
}
return $line;
}
public function getProcessIsolation()
{
return $this->processIsolation;
}
public function setProcessIsolation($processIsolation)
{
$this->processIsolation = (Boolean) $processIsolation;
if ($this->processIsolation && !class_exists('Symfony\\Component\\Process\\Process')) {
throw new \RuntimeException('Unable to isolate processes as the Symfony Process Component is not installed.');
}
}
}
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