Composer

Composer is a PHP package management tool to help manage your project or libraries' dependencies. This project allows use of Composer from Drush.

Installation

drush dl composer-8

Manual

git clone --branch 8.x-1.x http://git.drupal.org/project/composer.git ~/.drush/composer

Since this is Drush extension that works across all versions of Drush, it doesn't need a different release for each different Drupal version. Hence this just being an 8.x project.

Usage

drush composer

Lists all available Composer commands.

drush composer install

Parses composer.json, and installs all dependencies

drush composer update

Updates your dependencies to the latest version, and updates cached information.

drush composer init

Walk through a wizard to create your own composer.json file.

drush composer create-project symfony/symfony

Downloads the symfony/symfony project and all its dependencies.

Modules

This is a list of some of the Drupal modules that integrate with Composer.

Composer Manager

Provides a user interface to let you know when you should update your dependencies, along with a single library space and autoloader.

Composer Autoload

This module automatically loads all autoload.php files and cache them appropriately.

Composer Vendor

Similar to Composer Autoload, but expects your vendor code to be at sites/all/vendor.

Symfony module

An example of a Drupal module using Composer for its external dependencies.

Git Wrapper

Allows integration with a Git repository.

Example

The following is an example of a composer.json file that will download the latest in the 1.0.* branch of Monolog...

{
    "require": {
        "monolog/monolog": "1.0.*"
    }
}

See Packagist for a repository of available packages to install and depend on.