How to integrate LESS into ZendFramework 2

Question

I have found this tutorial which is for ZendFramework 1. I download less and put it under project/vendor/.

Leafo
└── Less
    ├── Lessc.php
    └── Lessify.php

In project/module/Application/Module.php

...
public function onBootstrap(MvcEvent $e)
{
    ...
    $this->compileLess();
}
...
public function compileLess()
{
    if (APPLICATION_ENV == 'production') {
        return;
    }
    require_once PROJECT_PATH . '/vendor/Leafo/Less/Lessc.php';

    $less_file = PROJECT_PATH . '/public/less/style.less';
    $css_file = PROJECT_PATH . '/public/css/style.css';

    $lessc = new \Leafo\Less\Lessc($less_file);
    file_put_contents($css_file, $lessc->parse());
}

Unfortunately, I get the error below

Fatal error: Class 'Leafo\Less\Lessc' not found in /Users/jslim/public_html/littlepinktree/module/Application/Module.php on line 53

I have a few questions here:

1. How do I integrate 3rd party library to ZF2 (if the 3rd party library is not using namespace)?
2. Is there any example showing how to integrate LESS to ZF2?

Answer 1

You need to register the Leafo namespace in the autoloader. Let's say you have this tree:

MyProject
└── vendor
        Leafo
        └── Less
            ├── Lessc.php
            └── Lessify.php

Than you have to register the namespace like this:

    Zend\Loader\AutoloaderFactory::factory(array(
        'Zend\Loader\StandardAutoloader' => array(
            'autoregister_zf' => true,
            'namespaces' => array(
                'Leafo' => '/MyProject/vendor/Leafo',
            ),
        )
    ));

If you'r using the ZendSkeletonApplication you can change this in the init_autoloader.php file.

Answer 2

I have solved this by putting the whole director in ./module/Application/src/Less

NOTE: I used back the original structure as follow

src
├── Application
│   └── Controller
│       └── IndexController.php
└── Less
    ├── LICENSE
    ├── Makefile
    ├── README.md
    ├── composer.json
    ├── docs
    │   └── docs.md
    ├── lessc.inc.php
    ├── lessify
    ├── lessify.inc.php
    ├── package.sh
    ├── plessc
    └── tests
        ├── ApiTest.php
        ├── InputTest.php
        ├── README.md
        ├── bootstrap.sh
        ├── inputs
        ├── outputs
        └── sort.php

Use class map in Application module ./module/Application/Module.php

public function getAutoloaderConfig()
{
    return array(
        'Zend\Loader\ClassMapAutoloader' => array(
            __DIR__ . '/autoload_classmap.php',
        ),
        'Zend\Loader\StandardAutoloader' => array(
            'namespaces' => array(
                __NAMESPACE__ => __DIR__ . '/src/' . __NAMESPACE__,
            ),
        ),
    );
}

Then generate autoload_classmap.php

<?php
// Generated by ZF2's ./bin/classmap_generator.php
return array(
    'Application\Module'                     => __DIR__ . '/Module.php',
    'Application\Controller\IndexController' => __DIR__ . '/src/Application/Controller/IndexController.php',
    'lessc'                                  => __DIR__ . '/src/Less/lessc.inc.php',
    'lessc_parser'                           => __DIR__ . '/src/Less/lessc.inc.php',
    'lessc_formatter_classic'                => __DIR__ . '/src/Less/lessc.inc.php',
    'lessc_formatter_compressed'             => __DIR__ . '/src/Less/lessc.inc.php',
    'lessc_formatter_lessjs'                 => __DIR__ . '/src/Less/lessc.inc.php',
    'easyparse'                              => __DIR__ . '/src/Less/lessify.inc.php',
    'tagparse'                               => __DIR__ . '/src/Less/lessify.inc.php',
    'nodecounter'                            => __DIR__ . '/src/Less/lessify.inc.php',
    'lessify'                                => __DIR__ . '/src/Less/lessify.inc.php',
    'ApiTest'                                => __DIR__ . '/src/Less/tests/ApiTest.php',
    'InputTest'                              => __DIR__ . '/src/Less/tests/InputTest.php',
    'lesscNormalized'                        => __DIR__ . '/src/Less/tests/sort.php',
    'SortingFormatter'                       => __DIR__ . '/src/Less/tests/sort.php',
);

Finally, I can use it

public function compileLess()
{
    if (APPLICATION_ENV == 'production') {
        return;
    }
    $less_file = PROJECT_PATH . '/public/less/style.less';
    $css_file = PROJECT_PATH . '/public/css/style.css';

    $lessc = new \lessc($less_file);
    file_put_contents($css_file, $lessc->parse());
}