AssetsInstallCommand.php

<?php

namespace Symfony\Bundle\FrameworkBundle\Command;

use Symfony\Component\Console\Input\InputArgument;
use Symfony\Component\Console\Input\InputOption;
use Symfony\Component\Console\Input\InputInterface;
use Symfony\Component\Console\Output\OutputInterface;
use Symfony\Component\Console\Output\Output;
use Symfony\Bundle\FrameworkBundle\Util\Filesystem;
use Symfony\Component\HttpKernel\Kernel;
use Symfony\Component\Console\Command\Command as BaseCommand;

/*
 * This file is part of the Symfony framework.
 *
 * (c) Fabien Potencier <fabien.potencier@symfony-project.com>
 *
 * This source file is subject to the MIT license that is bundled
 * with this source code in the file LICENSE.
 */

/**
 * AssetsInstallCommand.
 *
 * @author     Fabien Potencier <fabien.potencier@symfony-project.com>
 */
class AssetsInstallCommand extends BaseCommand
{

    /**
     * Holds Kernel instance
     *
     * @var Symfony\Component\HttpKernel\Kernel
     */
    private $kernel;

    /**
     * Holds Filesystem instance
     *
     * @var Symfony\Bundle\FrameworkBundle\Util\Filesystem
     */
    private $filesystem;

    /**
     * Sets Kernel instance
     *
     * @param Symfony\Component\HttpKernel\Kernel $kernel
     */
    public function setKernel(Kernel $kernel)
    {
        $this->kernel = $kernel;
    }

    /**
     * Sets Filesystem instance
     *
     * @param Symfony\Bundle\FrameworkBundle\Util\Filesystem $fs
     */
    public function setFilesystem(Filesystem $fs)
    {
        $this->filesystem = $fs;
    }

    /**
     * @see Command
     */
    protected function configure()
    {
        $this
            ->setDefinition(array(
                new InputArgument('target', InputArgument::REQUIRED, 'The target directory'),
            ))
            ->addOption('symlink', null, InputOption::PARAMETER_NONE, 'Symlinks the assets instead of copying it')
            ->setName('assets:install')
        ;
    }

    /**
     * @see Command
     *
     * @throws \InvalidArgumentException When the target directory does not exist
     */
    protected function execute(InputInterface $input, OutputInterface $output)
    {
        if (!is_dir($input->getArgument('target'))) {
            throw new \InvalidArgumentException(sprintf('The target directory "%s" does not exist.', $input->getArgument('target')));
        }

        foreach ($this->kernel->getBundles() as $bundle) {
            if (is_dir($originDir = $bundle->getPath().'/Resources/public')) {
                $output->writeln(sprintf('Installing assets for <comment>%s\\%s</comment>', $bundle->getNamespacePrefix(), $bundle->getName()));

                $targetDir = $input->getArgument('target').'/bundles/'.preg_replace('/bundle$/', '', strtolower($bundle->getName()));

                $this->filesystem->remove($targetDir);

                if ($input->getOption('symlink')) {
                    $this->filesystem->symlink($originDir, $targetDir);
                } else {
                    $this->filesystem->mkdirs($targetDir, 0777);
                    $this->filesystem->mirror($originDir, $targetDir);
                }
            }
        }
    }
}

AssetsInstallCommandTest.php

<?php

namespace Symfony\Bundle\FrameworkBundle\Command;

use Symfony\Bundle\FrameworkBundle\Command\AssetsInstallCommand;
use Symfony\Component\Console\Input\ArrayInput;
use Symfony\Component\Console\Output\NullOutput;

/*
 * This file is part of the Symfony framework.
 *
 * (c) Fabien Potencier <fabien.potencier@symfony-project.com>
 *
 * This source file is subject to the MIT license that is bundled
 * with this source code in the file LICENSE.
 */

class AssetsInstallCommandTest extends \PHPUnit_Framework_TestCase
{

    /**
     * @covers Symfony\Bundle\FrameworkBundle\AssetsInstallCommand::execute()
     */
    public function testRun()
    {
        $originDir = __DIR__ . '/Resources/public';
        $targetDir = __DIR__ . '/bundles/test';

        $filesystem = $this->getMockFilesystem();
        $filesystem->expects($this->once())
            ->method('remove')
            ->with($targetDir)
        ;
        $filesystem->expects($this->once())
            ->method('mkdirs')
            ->with($targetDir, 0777)
        ;
        $filesystem->expects($this->once())
            ->method('mirror')
            ->with($originDir, $targetDir)
        ;

        $bundle = $this->getMockBundle();
        $bundle->expects($this->any())
            ->method('getName')
            ->will($this->returnValue('TestBundle'))
        ;
        $bundle->expects($this->once())
            ->method('getPath')
            ->will($this->returnValue(__DIR__))
        ;

        $kernel = $this->getMockKernel();
        $kernel->expects($this->once())
            ->method('getBundles')
            ->will($this->returnValue(array($bundle)))
        ;

        $command = new AssetsInstallCommand();
        $command->setKernel($kernel);
        $command->setFilesystem($filesystem);
        $command->run(new ArrayInput(array('target' => __DIR__)), new NullOutput());
    }

    /**
     * Gets Filesystem mock instance
     *
     * @return Symfony\Bundle\FrameworkBundle\Util\Filesystem
     */
    private function getMockFilesystem()
    {
        return $this->getMock('Symfony\Bundle\FrameworkBundle\Util\Filesystem', array(), array(), '', false, false);
    }

    /**
     * Gets Bundle mock instance
     *
     * @return Symfony\Component\HttpKernel\Bundle\Bundle
     */
    private function getMockBundle()
    {
        return $this->getMock('Symfony\Component\HttpKernel\Bundle\Bundle', array(), array(), '', false, false);
    }

    /**
     * Gets Kernel mock instance
     *
     * @return Symfony\Component\HttpKernel\Kernel
     */
    private function getMockKernel()
    {
        return $this->getMock('Symfony\Component\HttpKernel\Kernel', array(), array(), '', false, false);
    }

}

console.xml

<?xml version="1.0" ?>

<container xmlns="http://www.symfony-project.org/schema/dic/services"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://www.symfony-project.org/schema/dic/services http://www.symfony-project.org/schema/dic/services/services-1.0.xsd">

    <parameters>
        <parameter key="console.command.assets_install.class">Symfony\Bundle\FrameworkBundle\Command\AssetsInstallCommand</parameter>
        <parameter key="console.command.init_bundle.class">Symfony\Bundle\FrameworkBundle\Command\InitBundleCommand</parameter>
        <parameter key="console.command.router_debug.class">Symfony\Bundle\FrameworkBundle\Command\RouterDebugCommand</parameter>
        <parameter key="console.command.router_apache_dumper.class">Symfony\Bundle\FrameworkBundle\Command\RouterApacheDumperCommand</parameter>
    </parameters>

    <services>
        <service id="console.command.assets_install" class="%console.command.assets_install.class%">
            <tag name="console.command" />
            <call method="setKernel">
                <argument type="service" id="kernel">
            </call>
            <call method="setFilesystem">
                <service class="Symfony\Bundle\FrameworkBundle\Util\Filesystem" shared="false">
            </call>
        </service>

        <service id="console.command.init_bundle" class="%console.command.init_bundle.class%">
            <tag name="console.command" />
        </service>

        <service id="console.command.router_debug" class="%console.command.router_debug.class%">
            <tag name="console.command" />
        </service>

        <service id="console.command.router_apache_dumper" class="%console.command.router_apache_dumper.class%">
            <tag name="console.command" />
        </service>
    </services>
</container>

I like the looks of this. How about adding an attribute to the tag that identifies the command tag name so they can be lazily loaded, similar to template helpers?

good idea Kris, this is a work in progress for tomorrow's blog post:)

Why not have the kernel and filesystem injected into the constructor of the command? since they are required for the execute method to be used anyway. Like this http://gist.github.com/627873.