relative_path_helper.js

var tag_helpers = {
    relative_path: function(basePath) { // I want basePath in this scope.
        var pathDepth = basePath.split('/').length -2;
        var path = new Array(pathDepth + 1).join('../');
        return path;
    }
};

module.exports = {
    get: function(basePath, file_extension, options, callback){
        return callback(null, { "tag": tag_helpers }, {}, new Date());
    }
};