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
            });
        //字体图标iconfont的路径
        env.addGlobal('iconfont',require('./config').iconfont);
    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=(view,model)=>{
            ctx.body=env.render(view,Object.assign({},ctx.state||{},model||{}));
            ctx.type='text/html'; 
        }
        await next();
    }
}
module.exports=templating;