index.js

'use strict';

//dependencies
var path = require('path');
var _ = require('lodash');

//load default engines
var excel = require(path.join(__dirname, 'lib', 'excel'));

//defaults options
var defaults = {
    sheet: 'Sheet',
    flat: true,
    joinFieldName: true,
    fieldSeparator: '_',
    multi: false,
    joinSheetName: false,
    missing: 'NA'
};

/**
 * @constructor
 * @description export js data into different acceptable format  
 * @param {Object} options export options
 * @return {Object} export instance
 * @public
 */
function Export(data, options) {

    //normalize options
    options = options || {};

    //merge defaults
    options = _.merge({}, defaults, options);

    //bind options
    this.options = options;

    //bind and normalize data
    this.data = data;
    if (this.data && !_.isArray(this.data)) {
        this.data = [data];
    }

    //set default engines
    this.use('excel', excel);

}


/**
 * @function
 * @description plugin new export engine
 * @param  {String} name     name of the export engine
 * @param  {Object} exporter valid export engine definition
 * @public
 */
Export.prototype.use = function(name, engine) {
    //extend export with additional exporter engine
    var methods = ['write', 'download'];

    _.forEach(methods, function(method) {
        //prepare method name
        var _method = method + _.capitalize(name);

        //bind export engine functions into export
        this[_method] = function() {

            //invoke export engine method
            return engine[method].apply(this, arguments);

        };

    }.bind(this));
};


//export xlsform template
module.exports = exports = Export;