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{-# LANGUAGE DeriveGeneric #-}
{-# LANGUAGE FlexibleContexts #-}
{-# LANGUAGE FlexibleInstances #-}
{-# LANGUAGE MultiParamTypeClasses #-}
{-# LANGUAGE OverloadedStrings #-}
{-# LANGUAGE StandaloneDeriving #-}
{-# LANGUAGE TypeFamilies #-}
{-# LANGUAGE TypeOperators #-}
{-# LANGUAGE UndecidableInstances #-}
-- | Module that deals with handling config options
module LintConfig where
import Control.Monad.Identity (Identity)
import Data.Aeson (FromJSON (parseJSON), defaultOptions,
eitherDecode)
import Data.Aeson.Types (genericParseJSON)
import qualified Data.ByteString.Char8 as C8
import qualified Data.ByteString.Lazy as LB
import Data.Text (Text)
import GHC.Generics (Generic (Rep, from, to), K1 (..),
M1 (..), (:*:) (..))
import WithCli (Proxy (..))
import WithCli.Pure (Argument (argumentType, parseArgument))
type family HKD f a where
HKD Identity a = a
HKD f a = f a
data LintConfig f = LintConfig
{ assemblies :: HKD f [Text]
, scriptInject :: HKD f (Maybe Text)
} deriving (Generic)
deriving instance (Show (HKD a (Maybe Text)), Show (HKD a [Text]))
=> Show (LintConfig a)
instance (FromJSON (HKD a (Maybe Text)), FromJSON (HKD a [Text]))
=> FromJSON (LintConfig a) where
parseJSON = genericParseJSON defaultOptions
-- need to define this one extra, since Aeson will not make
-- Maybe fields optional if the type isn't given explicitly.
--
-- Whoever said instances had confusing semantics?
instance {-# Overlapping #-} FromJSON (LintConfig Maybe) where
parseJSON = genericParseJSON defaultOptions
-- | generic typeclass for things that are "patchable"
class GPatch i m where
gappend :: i p -> m p -> i p
-- generic instances. It's category theory, but with confusing names!
instance GPatch (K1 a k) (K1 a (Maybe k)) where
gappend _ (K1 (Just k')) = K1 k'
gappend (K1 k) (K1 Nothing) = K1 k
{-# INLINE gappend #-}
instance (GPatch i o, GPatch i' o')
=> GPatch (i :*: i') (o :*: o') where
gappend (l :*: r) (l' :*: r') = gappend l l' :*: gappend r r'
{-# INLINE gappend #-}
instance GPatch i o
=> GPatch (M1 _a _b i) (M1 _a' _b' o) where
gappend (M1 x) (M1 y) = M1 (gappend x y)
{-# INLINE gappend #-}
-- | A patch function. For (almost) and a :: * -> *,
-- take an a Identity and an a Maybe, then replace all appropriate
-- values in the former with those in the latter.
--
-- There isn't actually any useful reason for this function to be this
-- abstract, I just wanted to play around with higher kinded types for
-- a bit.
patch ::
( Generic (f Maybe)
, Generic (f Identity)
, GPatch (Rep (f Identity))
(Rep (f Maybe))
)
=> f Identity
-> f Maybe
-> f Identity
patch x y = to (gappend (from x) (from y))
instance (FromJSON (LintConfig a)) => Argument (LintConfig a) where
parseArgument str =
case eitherDecode (LB.fromStrict $ C8.pack str) of
Left _ -> Nothing
Right res -> Just res
argumentType Proxy = "LintConfig"
|
