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Мой текущий код генерирует следующее сообщение об ошибке, когда линии являются раскомментирована, который является первым блокатор:Snap render list in Hamlet
Couldn't match expected type `String -> String' with actual type `String' In the return type of a call of `renderHtml' Probable cause: `renderHtml' is applied to too many arguments In the expression: renderHtml ($ (shamletFile "fileList.hamlet")) In an equation for `myTemplate': myTemplate = renderHtml ($ (shamletFile "fileList.hamlet"))
Код:
site :: Snap()
site =
ifTop (writeBS "hello world") <|>
route [ ("foo", writeBS "ba"),
("view_root_json_files", listRootFilesHandler)
] <|>
dir "static" (serveDirectory ".")
--myTemplate :: String -> String
--myTemplate = renderHtml ($(shamletFile "fileList.hamlet"))
toText :: [FilePath] -> Text
toText = foldMap (flip snoc '\n' . pack)
listRootFilesHandler :: Snap()
listRootFilesHandler = do
filenames <- liftIO $ getDirectoryContents "data"
let filtered_filenames = filter (not . isPrefixOf ".") filenames
writeText $ toText filtered_filenames