simonwheatley · Jul 2, 2014 · Jul 2, 2014 · Jul 2, 2014 · Jul 3, 2014 · Jul 15, 2014
diff --git a/ComposerScript/Installer.php b/ComposerScript/Installer.php
@@ -0,0 +1,212 @@
+<?php 
+
+namespace ComposerScript;
+
+use Composer\Script\Event;
+
+class Installer {
+
+	/**
+	 * Hooks the post-package-install Composer event
+	 *
+	 * After a package is installed, we need to write
+	 * process the package in case it's a MU plugin
+	 * and we need to add the require files.
+	 *
+	 * @param Event $event A Composer Event object
+	 * @return void
+	 * @author Simon Wheatley
+	 **/
+	public static function post_package_install( Event $event ) {
+		$composer  = $event->getComposer();
+		$io        = $event->getIO();
+		$operation = $event->getOperation();
+		$package   = $operation->getPackage();
+		$im        = $composer->getInstallationManager();
+
+		$install_path = $im->getInstallPath( $package );
+
+		self::handle_plugin_requires( $install_path, $io );
+	}
+
+	/**
+	 * Hooks the pre-package-update Composer event
+	 *
+	 * Before a package is updated, we need to remove
+	 * related require files, in case they are stale
+	 * (we will recreate the required files after the
+	 * package has been updated).
+	 *
+	 * @param Event $event A Composer Event object
+	 * @return void
+	 * @author Simon Wheatley
+	 **/
+	public static function pre_package_update( Event $event ) {
+		$composer  = $event->getComposer();
+		$io        = $event->getIO();
+		$operation = $event->getOperation();
+		$package   = $operation->getTargetPackage();
+		$im        = $composer->getInstallationManager();
+
+		$install_path = $im->getInstallPath( $package );
+
+		self::remove_require_files( $install_path, $io );
+	}
+
+	/**
+	 * Hooks the post-package-update Composer event
+	 *
+	 * After the package is updated, we write any
+	 * require files we need.
+	 * 
+	 * @param Event $event A Composer Event object
+	 * @return void
+	 * @author Simon Wheatley
+	 **/
+	public static function post_package_update( Event $event ) {
+		$composer  = $event->getComposer();
+		$io        = $event->getIO();
+		$operation = $event->getOperation();
+		$package   = $operation->getTargetPackage();
+		$im        = $composer->getInstallationManager();
+
+		$install_path = $im->getInstallPath( $package );
+
+		self::handle_plugin_requires( $install_path, $io );
+	}
+
+	/**
+	 * Hooks the pre-package-uninstall Composer event
+	 * 
+	 * Before the package is uninstalled, while it still
+	 * exists, we remove the require files.
+	 *
+	 * @param Event $event A Composer Event object
+	 * @return void
+	 * @author Simon Wheatley
+	 **/
+	public static function pre_package_uninstall( Event $event ) {
+		$composer  = $event->getComposer();
+		$io        = $event->getIO();
+		$operation = $event->getOperation();
+		$package   = $operation->getPackage();
+		$im        = $composer->getInstallationManager();
+
+		$install_path = $im->getInstallPath( $package );
+
+		self::remove_require_files( $install_path, $io );
+	}
+
+	/**
+	 * Process a mu-plugins installed package, creating the relevant
+	 * require file(s).
+	 *
+	 * @param string $install_path The path to the package
+	 * @param IOInterface $io The Composer IOInterface, for writing messages
+	 * @return void
+	 * @author Simon Wheatley
+	 **/
+	protected static function handle_plugin_requires( $install_path, $io ) {
+		if ( 'htdocs/wp-content/mu-plugins' == dirname( $install_path ) ) {
+			$plugin_files = self::get_plugin_files( $install_path );
+			foreach ( $plugin_files as $plugin_file => $plugin_name ) {
+				self::write_plugin_require( $io, $plugin_name, $plugin_file, $install_path );
+			}
+		}
+	}
+
+	/**
+	 * Remove the require file for a mu-plugins installed package.
+	 *
+	 * @param string $install_path The path to the package
+	 * @param IOInterface $io The Composer IOInterface, for writing messages
+	 * @return void
+	 * @author Simon Wheatley
+	 **/
+	protected static function remove_require_files( $install_path, $io ) {
+		if ( 'htdocs/wp-content/mu-plugins' == dirname( $install_path ) ) {
+			$plugin_files = self::get_plugin_files( $install_path );
+			foreach ( $plugin_files as $plugin_file => $plugin_name ) {
+				self::remove_plugin_require( $io, $plugin_name, $plugin_file, $install_path );
+			}
+		}
+
+	}
+
+	/**
+	 * Get all the plugin files within the package, and their plugin names.
+	 *
+	 * @param strong $install_path The path to the Composer package (a mu-plugins subdirectory)
+	 * @return array An array of plugin paths (key) and plugin names (value)
+	 * @author Simon Wheatley
+	 **/
+	protected static function get_plugin_files( $install_path ) {
+		$files = array();
+		foreach ( glob( "{$install_path}*.php" ) as $file ) {
+			$file_contents = file_get_contents( $file, false, null, -1, 8192 );
+			if ( preg_match( '/^[ \t\/*#@]*Plugin Name:(.*)$/mi', $file_contents, $matches ) ) {
+				$files[ $file ] = trim( $matches[1] );
+			}
+		}
+		return $files;
+	}
+
+	/**
+	 * Write a basic plugin file, which requires the relevant file
+	 * inside mu-plugins/[folder].
+	 *
+	 * @param IOInterface $io The Composer IOInterface, for writing messages
+	 * @param array $plugin_name A plugin name
+	 * @param array $plugin_file A plugin file path
+	 * @param string $install_path The path to the Composer package (a mu-plugins subdirectory)
+	 * @return void
+	 * @author Simon Wheatley
+	 **/
+	protected static function write_plugin_require( $io, $plugin_name, $plugin_file, $install_path ) {
+		$lines = array();
+		$lines[] = '<?php';
+		$lines[] = '/**';
+		$lines[] = sprintf( ' * Plugin Name: %s', $plugin_name );
+		$lines[] = ' * ';
+		$lines[] = ' * This file was autogenerated by a Composer install script ';
+		$lines[] = sprintf( ' * located at: %s.', __FILE__ );
+		$lines[] = ' */';
+		$lines[] = '';
+		$lines[] = sprintf( 'require_once( dirname( __FILE__ ) . \'/%s/%s\' );', basename( dirname( $plugin_file ) ), basename( $plugin_file ) );
+		$lines[] = '';
+		$file_contents = implode( PHP_EOL, $lines );
+		$require_plugin_file = self::require_plugin_file_path( $install_path, $plugin_file );
+		file_put_contents( $require_plugin_file, $file_contents );
+		$io->write( sprintf( 'Created auto-require file for "%s" at %s', $plugin_name, $require_plugin_file ) );
+	}
+
+	/**
+	 * Remove the basic plugin file, which requires the relevant file
+	 * inside mu-plugins/[folder].
+	 *
+	 * @param IOInterface $io The Composer IOInterface, for writing messages
+	 * @param array $plugin_name A plugin name
+	 * @param array $plugin_file A plugin file path
+	 * @param string $install_path The path to the Composer package (a mu-plugins subdirectory)
+	 * @return void
+	 * @author Simon Wheatley
+	 **/
+	protected static function remove_plugin_require( $io, $plugin_name, $plugin_file, $install_path ) {
+		$require_plugin_file = self::require_plugin_file_path( $install_path, $plugin_file );
+		unlink( $require_plugin_file );
+		$io->write( sprintf( 'Removed auto-require file for "%s" at %s', $plugin_name, $require_plugin_file ) );
+	}
+
+
+	/**
+	 * Provide the file path for a file within the mu-plugins folder.
+	 *
+	 * @param string $install_path The path to the Composer package (a mu-plugins subdirectory)
+	 * @param string $plugin_file  The path to the plugin file within the Composer package
+	 * @return string A file path
+	 * @author Simon Wheatley
+	 **/
+	static function require_plugin_file_path( $install_path, $plugin_file ) {
+		return sprintf( '%s/auto-require-%s', dirname( $install_path ), basename( $plugin_file ) );
+	}
+}
diff --git a/composer.json b/composer.json
@@ -20,14 +20,38 @@
 	},
 	"require"     : {
 		"wpackagist-plugin/query-monitor"                  : "dev-master",
+		"wpackagist-plugin/responsible"                    : "@stable",
 		"php"                                              : ">=5.2.4"
 	},
 	"require-dev" : {
 	},
 	"extra"       : {
 		"installer-paths": {
+ 			"htdocs/wp-content/mu-plugins/{$name}/": [
+				"wpackagist-plugin/responsible"
+			],
 			"htdocs/wp-content/plugins/{$name}/"     : ["type:wordpress-plugin"],
 			"htdocs/wp-content/themes/{$name}/"      : ["type:wordpress-theme"]
 		}
-	}
-}
+	},
+	"autoload": {
+	    "psr-0": {
+	        "ComposerScript\\Installer" : ""
+	    }
+	},
+    "scripts": {
+    	"pre-package-uninstall" : [
+			"ComposerScript\\Installer::pre_package_uninstall"
+        ],
+        "pre-package-update": [
+			"ComposerScript\\Installer::pre_package_update"
+        ],
+        "post-package-update": [
+			"ComposerScript\\Installer::post_package_update"
+        ],
+        "post-package-install": [
+			"ComposerScript\\Installer::post_package_install"
+        ]
+    }
+
+}