More work on the installer skeleton

Author: castarco

src/Command/InfoCommand.php

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+<?php
+
+
+namespace Litipk\JupyterPhpInstaller\Command;
+
+
+final class InfoCommand
+{
+
+}

src/Command/InstallCommand.php

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+<?php
+
+
+namespace Litipk\JupyterPhpInstaller\Command;
+
+
+final class InstallCommand
+{
+
+}

src/Command/UninstallCommand.php

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+<?php
+
+
+namespace Litipk\JupyterPhpInstaller\Command;
+
+
+final class UninstallCommand
+{
+
+}

src/Command/UpdateCommand.php

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+<?php
+
+
+namespace Litipk\JupyterPhpInstaller\Command;
+
+
+final class UpdateCommand
+{
+
+}

src/Console/Application.php

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+<?php
+
+
+namespace Litipk\JupyterPhpInstaller\Console;
+
+
+use Litipk\JupyterPhpInstaller\Command\InfoCommand;
+use Litipk\JupyterPhpInstaller\Command\InstallCommand;
+use Litipk\JupyterPhpInstaller\Command\UninstallCommand;
+use Litipk\JupyterPhpInstaller\Command\UpdateCommand;
+use Litipk\JupyterPhpInstaller\IO\ConsoleIO;
+use Litipk\JupyterPhpInstaller\IO\IOInterface;
+use Litipk\JupyterPhpInstaller\Util\ErrorHandler;
+
+use Symfony\Component\Console\Application as BaseApplication;
+use Symfony\Component\Console\Formatter\OutputFormatter;
+use Symfony\Component\Console\Formatter\OutputFormatterStyle;
+use Symfony\Component\Console\Input\InputInterface;
+use Symfony\Component\Console\Output\ConsoleOutput;
+use Symfony\Component\Console\Output\OutputInterface;
+
+
+/**
+ * The console application that handles the commands
+ */
+final class Application extends BaseApplication
+{
+    /** @var IOInterface */
+    protected $io;
+
+    public function __construct()
+    {
+        static $shutdownRegistered = false;
+
+        if (function_exists('ini_set') && extension_loaded('xdebug')) {
+            ini_set('xdebug.show_exception_trace', false);
+            ini_set('xdebug.scream', false);
+        }
+
+        if (function_exists('date_default_timezone_set') && function_exists('date_default_timezone_get')) {
+            date_default_timezone_set(@date_default_timezone_get());
+        }
+
+        if (!$shutdownRegistered) {
+            $shutdownRegistered = true;
+
+            register_shutdown_function(function () { $this->handleShutdown(); });
+        }
+
+        parent::__construct('Jupyter-PHP Installer', '0.1');
+    }
+
+    /**
+     * Starts the application, boilerplate code.
+     * @param InputInterface|null $input
+     * @param OutputInterface|null $output
+     * @return int
+     */
+    public function run(InputInterface $input = null, OutputInterface $output = null)
+    {
+        if (null === $output) {
+            $output = new ConsoleOutput(
+                ConsoleOutput::VERBOSITY_NORMAL,
+                null,
+                new OutputFormatter(false, [
+                    'highlight' => new OutputFormatterStyle('red'),
+                    'warning' => new OutputFormatterStyle('black', 'yellow'),
+                ])
+            );
+        }
+
+        return parent::run($input, $output);
+    }
+
+    /**
+     * Runs the application's business logic.
+     */
+    public function doRun(InputInterface $input, OutputInterface $output)
+    {
+        $this->io = new ConsoleIO($input, $output, $this->getHelperSet());
+        ErrorHandler::register($this->io);
+        $io = $this->io;
+
+        if (PHP_VERSION_ID < 50509) {
+            $io->writeError(
+                '<warning>'.
+                'This installer only officially supports PHP 5.5.9 and above, you will most likely encounter problems with your PHP '.
+                PHP_VERSION.', upgrading is strongly recommended'.
+                '</warning>'
+            );
+        }
+
+        if (extension_loaded('xdebug')) {
+            $io->writeError(
+                '<warning>'.
+                'You are running PHP-CLI with xdebug enabled. This will have a major impact on the kernel\'s performance.'.
+                '</warning>'
+            );
+        }
+
+        return parent::doRun($input, $output);
+    }
+
+    /**
+     * Initializes all the composer commands.
+     */
+    protected function getDefaultCommands()
+    {
+        $commands = parent::getDefaultCommands();
+        $commands[] = new InstallCommand();
+        $commands[] = new UninstallCommand();
+        $commands[] = new UpdateCommand();
+        $commands[] = new InfoCommand();
+
+
+        if ('phar:' === substr(__FILE__, 0, 5)) {
+            // Nothing to do, yet
+        }
+
+        return $commands;
+    }
+
+    /**
+     * Handles the program shutdown.
+     */
+    private function handleShutdown()
+    {
+        $lastError = error_get_last();
+
+        if (!empty($lastError) && isset($lastError['message'])) {
+            $this->handleShutdownLastError($lastError);
+        }
+    }
+
+    /**
+     * Handles the errors that caused the shutdown.
+     * @param array $lastError
+     */
+    private function handleShutdownLastError(array $lastError)
+    {
+        if (
+            strpos($lastError['message'], 'Allowed memory') !== false  /* Zend PHP out of memory error */ ||
+            strpos($lastError['message'], 'exceeded memory') !== false /* HHVM out of memory errors */
+        ) {
+            $this->explainMemoryErrorSolution();
+        }
+    }
+
+    /**
+     * Explains to the user what can be done to solve the memory error that caused the shutdown.
+     */
+    private function explainMemoryErrorSolution()
+    {
+        if (extension_loaded('xdebug')) {
+            echo "\n" . 'You should disable the Xdebug extension in your php.ini settings file.' . "\n";
+        } else {
+            echo "\n" . 'You should increase the `memory_limit` parameter in your php.ini settings file.' . "\n";
+        }
+    }
+}