utils.js

const fs = require('fs');
const path = require('path');

function loadUserConfig() {
    const file = path.resolve(process.cwd(), 'handlebars.config.js');
    const flavors = [
        file, // handlebars.config.js
        file.replace('.js', '.json'), // handlebars.config.json
        file.replace('handlebars.', 'hbs.'), // hbs.config.js
        file.replace('handlebars.', 'hbs.').replace('.js', '.json'), // hbs.config.json
    ];

    if (fs.existsSync(flavors[0])) { // eslint-disable-line no-sync
        return require(flavors[0]); // eslint-disable-line global-require
    }

    if (fs.existsSync(flavors[1])) { // eslint-disable-line no-sync
        return JSON.parse(fs.readFileSync(flavors[1], { encoding: 'utf-8' })); // eslint-disable-line no-sync
    }

    if (fs.existsSync(flavors[2])) { // eslint-disable-line no-sync
        return require(flavors[2]); // eslint-disable-line global-require
    }

    if (fs.existsSync(flavors[3])) { // eslint-disable-line no-sync
        return JSON.parse(fs.readFileSync(flavors[3], { encoding: 'utf-8' })); // eslint-disable-line no-sync
    }

    return {};
}

const parseSimpleLayout = (str, opts) => {
    const layoutPattern = /{{!<\s+([A-Za-z0-9._\-/]+)\s*}}/;
    const matches = str.match(layoutPattern);

    if (matches) {
        let layout = matches[1];

        if (opts.layouts && layout[0] !== '.') {
            layout = path.resolve(opts.layouts, layout);
        }

        const hbsLayout = path.resolve(process.cwd(), `${layout}.hbs`);

        if (fs.existsSync(hbsLayout)) { // eslint-disable-line no-sync
            const content = fs.readFileSync(hbsLayout, { encoding: 'utf-8' }); // eslint-disable-line no-sync
            return content.replace('{{{body}}}', str);
        }

        const handlebarsLayout = hbsLayout.replace('.hbs', '.handlebars');

        if (fs.existsSync(handlebarsLayout)) { // eslint-disable-line no-sync
            const content = fs.readFileSync(handlebarsLayout, { encoding: 'utf-8' }); // eslint-disable-line no-sync
            return content.replace('{{{body}}}', str);
        }
    }

    return str;
};

module.exports = {
    loadUserConfig,
    parseSimpleLayout,
};