Added wp-cli migrator command for s3 uplods

<?php

class S3_Uploads_WP_CLI_Command extends WP_CLI_Command {

	/**

	 * @subcommand migrate-attachments

	 * 

	 */

	public function migrate_attachments_to_s3() {

		$attachments = new WP_Query( array(

			'post_type' => 'attachment',

			'posts_per_page' => -1,

			'post_status' => 'all'

		));

		WP_CLI::line( sprintf( 'Attempting to move %d attachments to S3', $attachments->found_posts ) );

		foreach ( $attachments->posts as $attachment ) {

			$this->migrate_attachment_to_s3( array( $attachment->ID ) );

		}

	}

	/**

	 * Migrate a single attachment's files to S3

	 * 

	 * @subcommand migrate-attachment

	 * @synposis <attachment-id>

	 */

	public function migrate_attachment_to_s3( $args ) {

		$old_upload_dir = S3_Uploads::get_instance()->get_original_upload_dir();

		$file = get_post_meta( $args[0], '_wp_attached_file', true );

		if ( file_exists( $path = $old_upload_dir['basedir'] . '/' . $file ) ) {

			copy( $path, get_attached_file( $args[0] ) );

			unlink( $path );

			WP_CLI::success( sprintf( 'Moved attachment %d to S3', $args[0] ) ); 

		} else {

			WP_CLI::line( 'Already moved to S3' );

		}

	}

}

WP_CLI::add_command( 's3-uploads', 'S3_Uploads_WP_CLI_Command' );

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