handlebars-helpers.js

const $log = require('../utils/logger');
const Handlebars = require('handlebars');
const fse = require('fs-extra');
const moment = require('moment');

Handlebars.registerHelper('replace', (options) => '');
Handlebars.registerHelper('noop', (options) => options.fn(this));
Handlebars.registerHelper('for', (options) => $log.log(options));

Handlebars.registerHelper('capitalize', function (value) {
    return (value && typeof value === 'string') ? value.replace(/\b\w/g, l => l.toUpperCase()) : '';
});

Handlebars.registerHelper('eachWithSort', (array, key, direction, opts) => {
    let data;
    if (opts.data) {
        data  = Handlebars.createFrame(opts.data);
    }

    const sorted = array.sort((a, b) => {
        a = a[key];
        b = b[key];
        if (direction === '-') {
            return a < b ? 1 : a == b ? 0 : -1;

        } else {
            return a > b ? 1 : a == b ? 0 : -1;

        }

    });

    let s = '';
    sorted.forEach((e, i) => {
        if (data) {
            data.index = i;
        }

        s += opts.fn(e, data);
    });

    return s;
});

Handlebars.registerHelper('formatDate', function (value, format) {
    format = format || 'MMM Do YY';
    return moment.utc(value).format(format);
});


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

    return options.inverse(this);
});

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

    return options.inverse(this);
});

Handlebars.registerPartials = function registerPartials (files) {
    const partials = {};
    files.forEach((file) => {
        if ([ `.html`, `.svg`, `.md` ].indexOf(file.extension) === -1) {
            return;
        }

        // calling require here to avoid circular dependencies
        // http://selfcontained.us/2012/05/08/node-js-circular-dependencies/
        const Render = require('./render');
        const fm = Render.extract(file);
        const partial = Object.assign({}, file, {
            content: fm.content,
            variables: fm.fm,
            name: file.name.replace('.html', ''),
        });
        partials[partial.name] = partial;

        Handlebars.registerPartial(partial.name, partial.content);
        Handlebars.registerPartial(file.name, partial.content);

    });

    return partials;
};

module.exports = Handlebars;