fix compile with no default features

src/main.rs

@@ -20,12 +20,10 @@ use crate::database::UpEndDatabase;
 mod addressing;
 mod database;
 mod filesystem;
+mod previews;
 mod routes;
 mod util;
 
-#[cfg(feature = "previews")]
-mod previews;
-
 const VERSION: &str = env!("CARGO_PKG_VERSION");
 
 fn main() -> Result<()> {

src/previews/mod.rs

@@ -26,6 +26,7 @@ pub struct PreviewStore {
     locks: Mutex<HashMap<Hash, Arc<Mutex<PathBuf>>>>,
 }
 
+#[cfg(feature = "previews")]
 impl PreviewStore {
     pub fn new<P: AsRef<Path>>(path: P, db: Arc<UpEndDatabase>) -> Self {
         PreviewStore {

src/routes.rs

@@ -220,7 +220,9 @@ pub async fn delete_object(
 #[get("/api/all/attributes")]
 pub async fn get_all_attributes(state: web::Data<State>) -> Result<HttpResponse, Error> {
     let connection = state.upend.connection().map_err(ErrorInternalServerError)?;
-    let result = connection.get_all_attributes().map_err(ErrorInternalServerError)?;
+    let result = connection
+        .get_all_attributes()
+        .map_err(ErrorInternalServerError)?;
     Ok(HttpResponse::Ok().json(result))
 }
 
@@ -322,6 +324,7 @@ pub async fn get_thumbnail(
     state: web::Data<State>,
     hash: web::Path<String>,
 ) -> Result<NamedFile, Error> {
+    #[cfg(feature = "previews")]
     if let Some(preview_store) = &state.preview_store {
         let address =
             Address::decode(&decode(hash.into_inner()).map_err(ErrorInternalServerError)?)
@@ -337,13 +340,12 @@ pub async fn get_thumbnail(
                     file = file.set_content_type(mime);
                 }
             }
-            Ok(file)
+            return Ok(file);
         } else {
-            Err(ErrorBadRequest(
+            return Err(ErrorBadRequest(
                 "Address does not refer to a previewable object.",
-            ))
+            ));
         }
-    } else {
-        Err(error::ErrorNotImplemented("Previews not enabled."))
     }
+    Err(error::ErrorNotImplemented("Previews not enabled."))
 }