added anyhow, improve hamburger menu, improve dw articles

src/error.rs

@@ -0,0 +1,34 @@
+use actix_web::{HttpResponse, ResponseError};
+use std::fmt;
+
+/// Wraps any error so it can be returned with `?` from request handlers.
+/// Always surfaces as a 500 to the client; the real error is logged.
+pub struct AppError(anyhow::Error);
+
+impl fmt::Debug for AppError {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        fmt::Debug::fmt(&self.0, f)
+    }
+}
+
+impl fmt::Display for AppError {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        fmt::Display::fmt(&self.0, f)
+    }
+}
+
+impl ResponseError for AppError {
+    fn error_response(&self) -> HttpResponse {
+        log::error!("Unhandled error: {:?}", self.0);
+        HttpResponse::InternalServerError().finish()
+    }
+}
+
+impl<E> From<E> for AppError
+where
+    E: Into<anyhow::Error>,
+{
+    fn from(err: E) -> Self {
+        AppError(err.into())
+    }
+}