Retrieve related subCommand

* When a command is added , add by cascad all subcommand managed by main command
* Could be useful to load only 'Oject' command and retrieve all its related 'Verb' command

Author: camlafit

src/Application.php

@@ -200,6 +200,11 @@ public function add(Command $command, string $alias = '', bool $default = false)
 
         $this->commands[$name] = $command->version($this->version)->onExit($this->onExit)->bind($this);
 
+        if (method_exists($command, "getSubCommands")) {
+            foreach ($command->getSubCommands() as $subcommand) {
+                $this->add($subcommand);
+            }
+        }
         return $this;
     }
 

src/Input/Command.php

@@ -450,4 +450,19 @@ protected function progress(?int $total = null): ProgressBar
     {
         return new ProgressBar($total, $this->writer());
     }
+
+
+    /**
+     * Get all related subCommands
+     *
+     * by default is an empty array
+     * could be populated by any way
+     * Return is an array[Command]
+     *
+     * @return array Command
+     */
+    public function getSubCommands(): Array
+    {
+        return [];
+    }
 }