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system/Commands/Help.php

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+<?php
+
+/**
+ * This file is part of CodeIgniter 4 framework.
+ *
+ * (c) CodeIgniter Foundation <admin@codeigniter.com>
+ *
+ * For the full copyright and license information, please view
+ * the LICENSE file that was distributed with this source code.
+ */
+
+namespace CodeIgniter\Commands;
+
+use CodeIgniter\CLI\BaseCommand;
+
+/**
+ * CI Help command for the spark script.
+ *
+ * Lists the basic usage information for the spark script,
+ * and provides a way to list help for other commands.
+ */
+class Help extends BaseCommand
+{
+    /**
+     * The group the command is lumped under
+     * when listing commands.
+     *
+     * @var string
+     */
+    protected $group = 'CodeIgniter';
+
+    /**
+     * The Command's name
+     *
+     * @var string
+     */
+    protected $name = 'help';
+
+    /**
+     * the Command's short description
+     *
+     * @var string
+     */
+    protected $description = 'Displays basic usage information.';
+
+    /**
+     * the Command's usage
+     *
+     * @var string
+     */
+    protected $usage = 'help command_name';
+
+    /**
+     * the Command's Arguments
+     *
+     * @var array
+     */
+    protected $arguments = [
+        'command_name' => 'The command name [default: "help"]',
+    ];
+
+    /**
+     * the Command's Options
+     *
+     * @var array
+     */
+    protected $options = [];
+
+    /**
+     * Displays the help for spark commands.
+     */
+    public function run(array $params)
+    {
+        $command  = array_shift($params);
+        $command  = $command ?? 'help';
+        $commands = $this->commands->getCommands();
+
+        if (! $this->commands->verifyCommand($command, $commands)) {
+            return;
+        }
+
+        $class = new $commands[$command]['class']($this->logger, $this->commands);
+        $class->showHelp();
+    }
+}