Restructure folders (#411)

template_engines/askama/src/main.rs

@@ -0,0 +1,40 @@
+use std::collections::HashMap;
+
+use actix_web::{web, App, HttpResponse, HttpServer, Result};
+use askama::Template;
+
+#[derive(Template)]
+#[template(path = "user.html")]
+struct UserTemplate<'a> {
+    name: &'a str,
+    text: &'a str,
+}
+
+#[derive(Template)]
+#[template(path = "index.html")]
+struct Index;
+
+async fn index(query: web::Query<HashMap<String, String>>) -> Result<HttpResponse> {
+    let s = if let Some(name) = query.get("name") {
+        UserTemplate {
+            name,
+            text: "Welcome!",
+        }
+        .render()
+        .unwrap()
+    } else {
+        Index.render().unwrap()
+    };
+    Ok(HttpResponse::Ok().content_type("text/html").body(s))
+}
+
+#[actix_web::main]
+async fn main() -> std::io::Result<()> {
+    // start http server
+    HttpServer::new(move || {
+        App::new().service(web::resource("/").route(web::get().to(index)))
+    })
+    .bind("127.0.0.1:8080")?
+    .run()
+    .await
+}