[Console] added a Process helper

src/Symfony/Component/Console/CHANGELOG.md

@@ -5,11 +5,13 @@ CHANGELOG
 -----
 
  * deprecated the dialog helper (use the question helper instead)
+ * added a Process helper
  * deprecated TableHelper in favor of Table
  * deprecated ProgressHelper in favor of ProgressBar
  * added a question helper
  * added a way to set the process name of a command
  * added a way to set a default command instead of `ListCommand`
+ * added a way to set the process title of a command
 
 2.4.0
 -----

src/Symfony/Component/Console/Helper/DebugFormatterHelper.php

@@ -0,0 +1,82 @@
+<?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\Helper;
+
+use Symfony\Component\Console\Helper\Helper;
+
+/**
+ * Helps outputting debug information when running an external program from a command.
+ *
+ * An external program can be a Process, an HTTP request, or anything else.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+class DebugFormatterHelper extends Helper
+{
+    private $colors = array('black', 'red', 'green', 'yellow', 'blue', 'magenta', 'cyan', 'white');
+    private $started = array();
+    private $count = -1;
+
+    public function start($id, $message, $prefix = 'RUN')
+    {
+        $this->started[$id] = array('border' => ++$this->count % count($this->colors));
+
+        return sprintf("%s<bg=blue;fg=white> %s </> <fg=blue>%s</>\n", $this->getBorder($id), $prefix, $message);
+    }
+
+    public function progress($id, $buffer, $error = false, $prefix = 'OUT', $errorPrefix = 'ERR')
+    {
+        $message = '';
+
+        if ($error) {
+            if (!isset($this->started[$id]['err'])) {
+                $message = sprintf("%s<bg=red;fg=white> %s </> ", $this->getBorder($id), $errorPrefix);
+                $this->started[$id]['err'] = true;
+            }
+
+            $message .= str_replace("\n", sprintf("\n%s<bg=red;fg=white> %s </> ", $this->getBorder($id), $errorPrefix), $buffer);
+        } else {
+            if (!isset($this->started[$id]['out'])) {
+                $message = sprintf("%s<bg=green;fg=white> %s </> ", $this->getBorder($id), $prefix);
+                $this->started[$id]['out'] = true;
+            }
+
+            $message .= str_replace("\n", sprintf("\n%s<bg=green;fg=white> %s </> ", $this->getBorder($id), $prefix), $buffer);
+        }
+
+        return $message;
+    }
+
+    public function stop($id, $message, $successful, $prefix = 'RES')
+    {
+        $trailingEOL = isset($this->started[$id]['out']) || isset($this->started[$id]['err']) ? "\n" : '';
+
+        if ($successful) {
+            return sprintf("%s%s<bg=green;fg=white> %s </> <fg=green>%s</>\n", $trailingEOL, $this->getBorder($id), $prefix, $message);
+        }
+
+        return sprintf("%s%s<bg=red;fg=white> %s </> <fg=red>%s</>\n", $trailingEOL, $this->getBorder($id), $prefix, $message);
+    }
+
+    private function getBorder($id)
+    {
+        return sprintf('<bg=%s> </>', $this->colors[$this->started[$id]['border']]);
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    public function getName()
+    {
+        return 'debug_formatter';
+    }
+}

src/Symfony/Component/Console/Helper/ProcessHelper.php

@@ -0,0 +1,93 @@
+<?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\Helper;
+
+use Symfony\Component\Console\Helper\Helper;
+use Symfony\Component\Console\Output\OutputInterface;
+use Symfony\Component\Process\Process;
+
+/**
+ * The Process class provides helpers to run external processes.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+class ProcessHelper extends Helper
+{
+    /**
+     * Runs an external process.
+     *
+     * @param OutputInterface $output   An OutputInterface instance
+     * @param string|Process  $cmd      An instance of Process or a command to run
+     * @param string|null     $error    An error message that must be displayed if something went wrong
+     * @param callback|null   $callback A PHP callback to run whenever there is some
+     *                                  output available on STDOUT or STDERR
+     *
+     * @return Process The process that ran
+     */
+    public function run(OutputInterface $output, $cmd, $error = null, $callback = null)
+    {
+        $verbose = $output->getVerbosity() >= OutputInterface::VERBOSITY_VERY_VERBOSE;
+        $debug = $output->getVerbosity() >= OutputInterface::VERBOSITY_DEBUG;
+
+        $formatter = $this->getHelperSet()->get('debug_formatter');
+
+        $process = $cmd instanceof Process ? $cmd : new Process($cmd);
+
+        if ($verbose) {
+            $output->write($formatter->start(spl_object_hash($process), $process->getCommandLine()));
+        }
+
+        if ($debug) {
+            $callback = $this->wrapCallback($output, $process, $callback);
+        }
+
+        $process->run($callback);
+
+        if ($verbose) {
+            $message = $process->isSuccessful() ? 'Command ran successfully' : sprintf('%s Command did not run sucessfully', $process->getExitCode());
+            $output->write($formatter->stop(spl_object_hash($process), $message, $process->isSuccessful()));
+        }
+
+        if (!$process->isSuccessful() && null !== $error) {
+            $output->writeln(sprintf('<error>%s</error>'), $error);
+        }
+
+        return $process;
+    }
+
+    /**
+     * Wraps a Process callback to add debugging output.
+     *
+     * @param OutputInterface $output   An OutputInterface interface
+     * @param callable|null   $callback A PHP callable
+     */
+    public function wrapCallback(OutputInterface $output, Process $process, $callback = null)
+    {
+        $formatter = $this->getHelperSet()->get('debug_formatter');
+
+        return function ($type, $buffer) use ($output, $process, $callback, $formatter) {
+            $output->write($formatter->progress(spl_object_hash($process), $buffer, 'err' === $type));
+
+            if (null !== $callback) {
+                $callback($type, $buffer);
+            }
+        };
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    public function getName()
+    {
+        return 'process';
+    }
+}

src/Symfony/Component/Console/composer.json

@@ -24,6 +24,7 @@
     },
     "suggest": {
         "symfony/event-dispatcher": "",
+        "symfony/process": "",
         "psr/log": "For using the console logger"
     },
     "autoload": {