Handlebars helpers

date.js

var moment = require('moment');
var isString = require('amp-is-string');

Handlebars.registerHelper('date', function (date, format) {
	var momentDate, formatStr;
	
	// no date is passed in, default to current date
	if ((date && date.data)) {
		momentDate = moment();
	} else {
		// if the date passed in is not a moment type, convert it to moment
		// otherwise use it
		if (!moment.isMoment(date)) {
			momentDate = moment(date);
			// if the date parsing fails
			if (!momentDate.isValid()) {
				throw new Error('The date passed in is invalid');
			}
		} else {
			momentDate = date;
		}
	}
	
	// if no format string, default to 'MM/DD/YYYY'
	formatStr = isString(format) ? format : 'MM/DD/YYYY';
	return momentDate.format(formatStr);
};

ifeq.js

Handlebars.registerHelper('ifeq', function (a, b, options) {
	if (a === b) {
		return options.fn(this);
	} else {
		return options.inverse(this);
	}
});

log.js

Handlebars.registerHelper('log', function (stuff) {
	console.log(stuff);
});

step.js

// step into context
// @param steps - the number of levels to go depeer into the context
function step (steps, options) {
	for (var key in this) {
		if (this.hasOwnProperty(key)) {
			if (steps === 1) {
				return options.fn(this[key]);
			} else {
				step(steps-1);
			}
		}
	}
};
Handlebars.registerHelper('step', step);