docs: function split( command ) {
      if ( typeof command !== 'string' ) {
          throw new Error( 'Command must be a string' );
      }
  
      var r = command.match( /[^"\s]+|"(?:\\"|[^"])*"/g );
      if ( ! r ) {
          return [];
      }
  
      return r.map( function ( expr ) {
          var isQuoted = expr.charAt( 0 ) === '"' && expr.charAt( expr.length - 1 ) === '"';
          return isQuoted ? expr.slice( 1, -1 ) : expr;
      } );
  }