class Bookmark {
    constructor( path , max_display_name_length, display_name = null ){
	this.path = path
	if( display_name == null ){
	    this.display_name = path.substr(-max_display_name_length )
	}
	else{
	    this.display_name = display_name.substr( -max_display_name_length )
	}
    }
}