templating.js

const nunjucks = require('nunjucks');

function createEnv(path, opts) {
  var
     autoescape = opts.autoescape === undefined ? true : opts.autoescape,
     noCache = opts.noCache || false,
     watch = opts.watch || false,
     throwOnUndefined = opts.throwOnUndefined || false,
     env = new nunjucks.Environment(
      new nunjucks.FileSystemLoader(path || 'views', {
        noCache: noCache,
        watch: watch,
      }), {
	autoescape: autoescape,
	throwOnUndefined: throwOnUndefined
      });
     if (opts.filters) {
        for(var f in opts.filters) {
	  env.addFilter(f,opts.filters[f]);
	}
     }
     return env;
}

function templating(path,opts) {
  var env = createEnv(path, opts);
  return async (ctx,next) => {
    ctx.render = function (view, model) {
      ctx.response.body = env.render(view, Object.assign({}, ctx.state || {}, model || {}));
      ctx.response.type = 'text/html';
    };
    await next();
  };
}

module.exports = templating;