albanm/nsi-routes

// A route builder that create routes for rendering handlebars templates
// The template source is fetched from a file and the file's changes are watched automatically

var fs = require('fs');
var path = require('path');
var handlebars = require('handlebars');

module.exports = function handlebarsRoute(fileName, routeName) {
    var that = this;
    var template = null;
    routeName = routeName || 'handlebars.' + path.basename(fileName, '.hbs');

    that.log('info', routeName + ' - Initialize');

    if (that.options.watch) {
        fs.watch(fileName, {
            persistent: false
        }, function() {
            that.log('info', routeName + ' - Template changed');
            template = null;
        });
    }

    return that.wrap(function(body, headers, callback) {
        if (!template) {
            fs.readFile(fileName, 'utf8', function(err, data) {
                if (err) throw err;
                template = handlebars.compile(data);
                var responseBody = template({
                    body: body,
                    headers: headers
                });
                callback(null, responseBody, headers);
            });
        } else {
            var responseBody = template({
                body: body,
                headers: headers
            });
            // use nextTick to make the route asynchronous
            process.nextTick(function() {
                callback(null, responseBody, headers);
            });
        }
    }, routeName);
};