129 lines
3.5 KiB
Haskell
129 lines
3.5 KiB
Haskell
{-# LANGUAGE NoImplicitPrelude #-}
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{-# LANGUAGE OverloadedStrings #-}
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{-# LANGUAGE ScopedTypeVariables #-}
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{-# LANGUAGE RankNTypes #-}
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{-# LANGUAGE TypeFamilies, FlexibleContexts, ConstraintKinds #-}
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{-# LANGUAGE QuasiQuotes #-}
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module Utils
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( module Utils
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) where
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import ClassyPrelude.Yesod
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import Utils.DB as Utils
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import Utils.Common as Utils
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import Text.Blaze (Markup, ToMarkup)
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-- import Data.Map (Map)
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-- import qualified Data.Map as Map
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-- import qualified Data.List as List
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import Control.Monad.Trans.Except (ExceptT(..), throwE, runExceptT)
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import Control.Monad.Trans.Maybe (MaybeT(..))
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import Control.Monad.Catch
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-----------
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-- Yesod --
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-----------
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newtype MsgRendererS site = MsgRenderer { render :: (forall msg. RenderMessage site msg => msg -> Text) }
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getMsgRenderer :: forall m site. (MonadHandler m, HandlerSite m ~ site) => m (MsgRendererS site)
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getMsgRenderer = do
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mr <- getMessageRender
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return $ MsgRenderer (mr . SomeMessage :: forall msg. RenderMessage site msg => msg -> Text)
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---------------------
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-- Text and String --
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---------------------
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tickmark :: IsString a => a
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tickmark = fromString "✔"
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text2Html :: Text -> Html
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text2Html = toHtml -- prevents ambiguous types
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toWgt :: (ToMarkup a, MonadBaseControl IO m, MonadThrow m, MonadIO m) =>
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a -> WidgetT site m ()
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toWgt = toWidget . toHtml
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text2widget :: (MonadBaseControl IO m, MonadThrow m, MonadIO m) =>
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Text -> WidgetT site m ()
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text2widget t = [whamlet|#{t}|]
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str2widget :: (MonadBaseControl IO m, MonadThrow m, MonadIO m) =>
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String -> WidgetT site m ()
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str2widget s = [whamlet|#{s}|]
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withFragment :: ( Monad m
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) => MForm m (a, WidgetT site IO ()) -> Markup -> MForm m (a, WidgetT site IO ())
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withFragment form html = (flip fmap) form $ \(x, widget) -> (x, toWidget html >> widget)
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------------
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-- Tuples --
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------------
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----------
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-- Maps --
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----------
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-----------
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-- Maybe --
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-----------
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whenIsJust :: Monad m => Maybe a -> (a -> m ()) -> m ()
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whenIsJust (Just x) f = f x
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whenIsJust Nothing _ = return ()
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maybeT :: Monad m => m a -> MaybeT m a -> m a
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maybeT x m = runMaybeT m >>= maybe x return
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catchIfMaybeT :: (MonadCatch m, Exception e) => (e -> Bool) -> m a -> MaybeT m a
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catchIfMaybeT p act = catchIf p (lift act) (const mzero)
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---------------
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-- Exception --
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---------------
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maybeExceptT :: Monad m => e -> m (Maybe b) -> ExceptT e m b
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maybeExceptT err act = lift act >>= maybe (throwE err) return
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maybeMExceptT :: Monad m => (m e) -> m (Maybe b) -> ExceptT e m b
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maybeMExceptT err act = lift act >>= maybe (lift err >>= throwE) return
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whenExceptT :: Monad m => Bool -> e -> ExceptT e m ()
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whenExceptT b err = when b $ throwE err
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whenMExceptT :: Monad m => Bool -> (m e) -> ExceptT e m ()
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whenMExceptT b err = when b $ lift err >>= throwE
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guardExceptT :: Monad m => Bool -> e -> ExceptT e m ()
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guardExceptT b err = unless b $ throwE err
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guardMExceptT :: Monad m => Bool -> (m e) -> ExceptT e m ()
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guardMExceptT b err = unless b $ lift err >>= throwE
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exceptT :: Monad m => (e -> m b) -> (a -> m b) -> ExceptT e m a -> m b
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exceptT f g = either f g <=< runExceptT
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catchIfMExceptT :: (MonadCatch m, Exception e) => (e -> m e') -> (e -> Bool) -> m a -> ExceptT e' m a
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catchIfMExceptT err p act = catchIf p (lift act) (throwE <=< lift . err)
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------------
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-- Monads --
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------------
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shortCircuitM :: Monad m => (a -> Bool) -> m a -> m a -> (a -> a -> a) -> m a
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shortCircuitM sc mx my op = do
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x <- mx
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case sc x of
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True -> return x
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False -> op <$> pure x <*> my
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