WordCamp Vegas Simple-Sample wp-cli Backup Plugin

wclv.php

<?php

// Let WP_CLI know we exist!
// Earlier versions of wp-cli used WP_CLI::addCommand()
WP_CLI::add_command( 'wclv', 'WCLV_Backup_Command' );

/**
 * The WCLV Backup Plugin
 *
 * @package WCLV_Backup
 * @subpackage commands/community
 * @maintainer Mike Schroder
 */
class WCLV_Backup_Command extends WP_CLI_Command {

	/**
	 * Backup your WordPress install.
	 *
	 * @param array $args
	 * @param array $assoc_args
	 */
	function backup( $args, $assoc_args ) {
		$filename = $dbname = null;

		// If a filename isn't specified, default to "Site's Title.tar.gz".
		if ( empty( $args ) )
			$filename = '../' . escapeshellarg( get_bloginfo() ) . '.tar.gz';
		else
			$filename = $args[0];

		// If --no-db is specified, don't include the database in backup
		if ( ! isset( $assoc_args['no-db'] ) ) {
			$dbname = '../database_temp.sql';

			// This is cheating a bit, since wp-cli doesn't currently support
			// running commands within commands without re-launching itself.
			WP_CLI::run_command( array( 'db', 'export', $dbname ), array() );
		}

		// GZ/Tar and Backup the install!
		WP_CLI::line( "Backing up to '$filename' ..." );
		$result = WP_CLI::launch( "tar -zcvf $filename . $dbname", false );

		// If we created a database backup, remove the temp file.
		if ( $dbname && ! unlink( $dbname ) )
			WP_CLI::warning( "Couldn't remove temporary database backup, '$dbname'." );

		// Will automatically exit on WP_CLI::error, but not WP_CLI::success.
		if ( 0 == $result ) {
			WP_CLI::success( "Backup Complete." );
		} else {
			WP_CLI::error( "Backup Failed." );
		}
	}

	/**
	 * Output syntax for command
	 */
	public static function help() {
		WP_CLI::line( "usage: wp wclv backup [--no-db] [path/to/file]" );
	}
}