some minor code cleanup

app/Main.hs

@@ -37,20 +37,17 @@ findChoirDay today table = maybe
 main' :: App ()
 main' = do
   args <- liftIO getArgs
-  case L.uncons args of
-    Nothing -> fail "We need exactly one config path as option"
-    Just (headArgs,_) ->  do
+  case args of
+    [] -> fail "Please provide a config file"
+    (headArgs : _) ->  do
       config <- parseConfigFile headArgs
       -- we want to handle these while we have the config in scope
-      result <- liftIO $ runApp $ do
+      handleE (\error' -> reportErrorMail config error') $ do
         bs <- request
         table <- except $ parseBString bs
         today <- liftIO getToday
         record <- except $ findChoirDay today table
         send (mailDomain config) (mailUsername config) (mailPassword config) (mailTo config) (mailFrom config) (mailSubject record) (mailText record)
-      case result of
-        Right x -> return x
-        Left error' -> reportErrorMail config error'