feature #9776 [Console] Added the possibility to set a different default command (danielcsgomes)

This PR was squashed before being merged into the 2.5-dev branch (closes #9776).

Discussion
----------

[Console] Added the possibility to set a different default command

I am not quite sure if this is the best approach to solve the issue but the solution I provide works. Let me know your suggestions to improve it.

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | yes
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | #8058
| License       | MIT
| Doc PR       | symfony/symfony-docs#3426

Commits
-------

418de05 [Console] Added the possibility to set a different default command

src/Symfony/Component/Console/Application.php

@@ -67,6 +67,7 @@ class Application
     private $helperSet;
     private $dispatcher;
     private $terminalDimensions;
+    private $defaultCommand;
 
     /**
      * Constructor.
@@ -80,6 +81,7 @@ class Application
     {
         $this->name = $name;
         $this->version = $version;
+        $this->defaultCommand = 'list';
         $this->helperSet = $this->getDefaultHelperSet();
         $this->definition = $this->getDefaultInputDefinition();
 
@@ -179,8 +181,8 @@ class Application
         }
 
         if (!$name) {
-            $name = 'list';
-            $input = new ArrayInput(array('command' => 'list'));
+            $name = $this->defaultCommand;
+            $input = new ArrayInput(array('command' => $this->defaultCommand));
         }
 
         // the command name MUST be the first element of the input
@@ -1096,4 +1098,14 @@ class Application
 
         return array_keys($alternatives);
     }
+
+    /**
+     * Sets the default Command name.
+     *
+     * @param string $commandName The Command name
+     */
+    public function setDefaultCommand($commandName)
+    {
+        $this->defaultCommand = $commandName;
+    }
 }

src/Symfony/Component/Console/CHANGELOG.md

@@ -4,6 +4,7 @@ CHANGELOG
 2.5.0
 -----
 
+* added a way to set a default command instead of `ListCommand`
 * added a way to set the process name of a command
 
 2.4.0

src/Symfony/Component/Console/Tests/ApplicationTest.php

@@ -894,6 +894,28 @@ class ApplicationTest extends \PHPUnit_Framework_TestCase
 
         return $dispatcher;
     }
+
+    public function testSetRunCustomDefaultCommand()
+    {
+        $command = new \FooCommand();
+
+        $application = new Application();
+        $application->setAutoExit(false);
+        $application->add($command);
+        $application->setDefaultCommand($command->getName());
+
+        $tester = new ApplicationTester($application);
+        $tester->run(array());
+        $this->assertEquals('interact called'.PHP_EOL.'called'.PHP_EOL, $tester->getDisplay(), 'Application runs the default set command if different from \'list\' command');
+
+        $application = new CustomDefaultCommandApplication();
+        $application->setAutoExit(false);
+
+        $tester = new ApplicationTester($application);
+        $tester->run(array());
+
+        $this->assertEquals('interact called'.PHP_EOL.'called'.PHP_EOL, $tester->getDisplay(), 'Application runs the default set command if different from \'list\' command');
+    }
 }
 
 class CustomApplication extends Application
@@ -918,3 +940,18 @@ class CustomApplication extends Application
         return new HelperSet(array(new FormatterHelper()));
     }
 }
+
+class CustomDefaultCommandApplication extends Application
+{
+    /**
+     * Overwrites the constructor in order to set a different default command.
+     */
+    public function __construct()
+    {
+        parent::__construct();
+
+        $command = new \FooCommand();
+        $this->add($command);
+        $this->setDefaultCommand($command->getName());
+    }
+}