[9.x] Add support for lazy loading commands

src/Illuminate/Console/Application.php

@@ -46,6 +46,13 @@ class Application extends SymfonyApplication implements ApplicationContract
      */
     protected static $bootstrappers = [];
 
+    /**
+     * A map of command names to classes.
+     *
+     * @var array
+     */
+    protected $commandMap = [];
+
     /**
      * The Event Dispatcher.
      *
@@ -254,10 +261,16 @@ protected function addToParent(SymfonyCommand $command)
      * Add a command, resolving through the application.
      *
      * @param  string  $command
-     * @return \Symfony\Component\Console\Command\Command
+     * @return \Symfony\Component\Console\Command\Command|null
      */
     public function resolve($command)
     {
+        if (class_exists($command) && ($commandName = $command::getDefaultName())) {
+            $this->commandMap[$commandName] = $command;
+
+            return null;
+        }
+
         return $this->add($this->laravel->make($command));
     }
 
@@ -278,6 +291,18 @@ public function resolveCommands($commands)
         return $this;
     }
 
+    /**
+     * Set the Container Command Loader.
+     *
+     * @return $this
+     */
+    public function setContainerCommandLoader()
+    {
+        $this->setCommandLoader(new ContainerCommandLoader($this->laravel, $this->commandMap));
+
+        return $this;
+    }
+
     /**
      * Get the default input definition for the application.
      *

src/Illuminate/Console/ContainerCommandLoader.php

@@ -0,0 +1,72 @@
+<?php
+
+namespace Illuminate\Console;
+
+use Psr\Container\ContainerInterface;
+use Symfony\Component\Console\CommandLoader\CommandLoaderInterface;
+use Symfony\Component\Console\Exception\CommandNotFoundException;
+
+class ContainerCommandLoader implements CommandLoaderInterface
+{
+    /**
+     * The container instance.
+     *
+     * @var \Psr\Container\ContainerInterface
+     */
+    protected $container;
+
+    /**
+     * A map of command names to classes.
+     *
+     * @var array
+     */
+    protected $commandMap;
+
+    /**
+     * @param  \Psr\Container\ContainerInterface $container
+     * @param  array  $commandMap
+     */
+    public function __construct(ContainerInterface $container, array $commandMap)
+    {
+        $this->container = $container;
+        $this->commandMap = $commandMap;
+    }
+
+    /**
+     * Loads a command.
+     *
+     * @param  string  $name
+     * @return \Symfony\Component\Console\Command\Command
+     *
+     * @throws \Symfony\Component\Console\Exception\CommandNotFoundException
+     */
+    public function get(string $name)
+    {
+        if (! $this->has($name)) {
+            throw new CommandNotFoundException(sprintf('Command "%s" does not exist.', $name));
+        }
+
+        return $this->container->get($this->commandMap[$name]);
+    }
+
+    /**
+     * Checks if a command exists.
+     *
+     * @param  string  $name
+     * @return bool
+     */
+    public function has(string $name)
+    {
+        return $name && isset($this->commandMap[$name]);
+    }
+
+    /**
+     * Get the command names.
+     *
+     * @return string[]
+     */
+    public function getNames()
+    {
+        return array_keys($this->commandMap);
+    }
+}

src/Illuminate/Foundation/Console/Kernel.php

@@ -327,8 +327,10 @@ public function bootstrap()
     protected function getArtisan()
     {
         if (is_null($this->artisan)) {
-            return $this->artisan = (new Artisan($this->app, $this->events, $this->app->version()))
-                                ->resolveCommands($this->commands);
+            $this->artisan = (new Artisan($this->app, $this->events, $this->app->version()))
+                            ->resolveCommands($this->commands);
+
+            return $this->artisan->setContainerCommandLoader();
         }
 
         return $this->artisan;

src/Illuminate/Foundation/Console/stubs/console.stub

@@ -13,6 +13,13 @@ class {{ class }} extends Command
      */
     protected $signature = '{{ command }}';
 
+    /**
+     * The default command name for lazy loading.
+     *
+     * @var string|null
+     */
+    protected static $defaultName = '{{ command }}';
+
     /**
      * The console command description.
      *