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--------------------------------------------------------------------------------
-- | There are a number of steps that sort items: 'Imports' and 'ModuleHeader',
-- and maybe more in the future. This module provides consistent sorting
-- utilities.
{-# LANGUAGE LambdaCase #-}
module Language.Haskell.Stylish.Ordering
( compareLIE
, compareWrappedName
, unwrapName
) where
--------------------------------------------------------------------------------
import Data.Char (isUpper)
import Data.Ord (comparing)
import GHC.Hs
import RdrName (RdrName)
import SrcLoc (unLoc)
--------------------------------------------------------------------------------
import Language.Haskell.Stylish.GHC (showOutputable)
import Outputable (Outputable)
--------------------------------------------------------------------------------
-- | NOTE: Can we get rid off this by adding a properly sorting newtype around
-- 'RdrName'?
compareLIE :: LIE GhcPs -> LIE GhcPs -> Ordering
compareLIE = comparing $ ieKey . unLoc
where
-- | The implementation is a bit hacky to get proper sorting for input specs:
-- constructors first, followed by functions, and then operators.
ieKey :: IE GhcPs -> (Int, String)
ieKey = \case
IEVar _ n -> nameKey n
IEThingAbs _ n -> nameKey n
IEThingAll _ n -> nameKey n
IEThingWith _ n _ _ _ -> nameKey n
IEModuleContents _ n -> nameKey n
_ -> (2, "")
--------------------------------------------------------------------------------
compareWrappedName :: IEWrappedName RdrName -> IEWrappedName RdrName -> Ordering
compareWrappedName = comparing nameKey
--------------------------------------------------------------------------------
unwrapName :: IEWrappedName n -> n
unwrapName (IEName n) = unLoc n
unwrapName (IEPattern n) = unLoc n
unwrapName (IEType n) = unLoc n
--------------------------------------------------------------------------------
nameKey :: Outputable name => name -> (Int, String)
nameKey n = case showOutputable n of
o@('(' : _) -> (2, o)
o@(o0 : _) | isUpper o0 -> (0, o)
o -> (1, o)
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