// {app_root}/config/plugin.js
exports.nunjucks = {
  enable: true,
  package: 'egg-view-nunjucks',
};

// {app_root}/config/config.default.js
exports.view = {
  defaultViewEngine: 'nunjucks',
  mapping: {
    '.nj': 'nunjucks',
  },
};

// {app_root}/app/controller/test.js
class TestController extends Controller {
  async list() {
    const ctx = this.ctx;
    // ctx.body = await ctx.renderString('{{ name }}', { name: 'local' });
    // not need to assign `ctx.render` to `ctx.body`
    // https://github.com/mozilla/nunjucks/blob/6f3e4a36a71cfd59ddc8c1fc5dcd77b8c24d83f3/nunjucks/src/environment.js#L318
    await ctx.render('test.nj', { name: 'view test' }, {
      path: '***'
    });
  }
}

// {app_root}/app/extend/filter.js
exports.hello = name => `hi, ${name}`;

// so you could use it at template
// {app_root}/app/controller/test.js
class TestController extends Controller {
  async list() {
    const ctx = this.ctx;
    ctx.body = await ctx.renderString('{{ name | hello }}', { name: 'egg' }, {
      path: '***'
    });
  };
}

// {app_root}/app.js
const markdown = require('nunjucks-markdown');
const marked = require('marked');

module.exports = app => {
  markdown.register(app.nunjucks, marked);
};