    {-# LANGUAGE DeriveDataTypeable #-}
    {-# LANGUAGE DeriveGeneric #-}
    {-# LANGUAGE OverloadedStrings #-}

    module Distribution.Types.BuildType
      ( BuildType (..)
      , knownBuildTypes
      ) where

    import Distribution.Compat.Prelude
    import Prelude ()

    import Distribution.CabalSpecVersion (CabalSpecVersion (..))
    import Distribution.Parsec
    import Distribution.Pretty

    import qualified Distribution.Compat.CharParsing as P
    import qualified Text.PrettyPrint as Disp

    -- | The type of build system used by this package.
    data BuildType
      = -- | calls @Distribution.Simple.defaultMain@
        Simple
      | -- | calls @Distribution.Simple.defaultMainWithHooks defaultUserHooks@,
        -- which invokes @configure@ to generate additional build
        -- information used by later phases.
        Configure
      | -- | calls @Distribution.Make.defaultMain@
        Make
      | -- | uses user-supplied @Setup.hs@ or @Setup.lhs@ (default)
        Custom
      | Hooks
      deriving ((forall x. BuildType -> Rep BuildType x)
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    instance Binary BuildType
    instance Structured BuildType
    instance NFData BuildType where rnf :: BuildType -> ()
    rnf = BuildType -> ()
    forall a. (Generic a, GNFData (Rep a)) => a -> ()
    genericRnf

    knownBuildTypes :: [BuildType]
    knownBuildTypes :: [BuildType]
    knownBuildTypes = [BuildType
    Simple, BuildType
    Configure, BuildType
    Make, BuildType
    Custom, BuildType
    Hooks]

    instance Pretty BuildType where
      pretty :: BuildType -> Doc
    pretty = String -> Doc
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    . BuildType -> String
    forall a. Show a => a -> String
    show

    instance Parsec BuildType where
      parsec :: forall (m :: * -> *). CabalParsing m => m BuildType
    parsec = do
        name <- (Char -> Bool) -> m String
    forall (m :: * -> *). CharParsing m => (Char -> Bool) -> m String
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    isAlphaNum
        case name of
          String
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    return BuildType
    Simple
          String
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    forall a. a -> m a
    forall (m :: * -> *) a. Monad m => a -> m a
    return BuildType
    Configure
          String
    "Custom" -> BuildType -> m BuildType
    forall a. a -> m a
    forall (m :: * -> *) a. Monad m => a -> m a
    return BuildType
    Custom
          String
    "Make" -> BuildType -> m BuildType
    forall a. a -> m a
    forall (m :: * -> *) a. Monad m => a -> m a
    return BuildType
    Make
          String
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            v <- m CabalSpecVersion
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    askCabalSpecVersion
            if v >= CabalSpecV3_14
              then return Hooks
              else fail "build-type: 'Hooks'. This feature requires cabal-version >= 3.14."
          String
    "Default" -> do
            v <- m CabalSpecVersion
    forall (m :: * -> *). CabalParsing m => m CabalSpecVersion
    askCabalSpecVersion
            if v <= CabalSpecV1_18 -- oldest version needing this, based on hackage-tests
              then do
                parsecWarning PWTBuildTypeDefault "build-type: Default is parsed as Custom for legacy reasons. See https://github.com/haskell/cabal/issues/5020"
                return Custom
              else fail ("unknown build-type: '" ++ name ++ "'")
          String
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    fail (String
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    forall a. [a] -> [a] -> [a]
    ++ String
    name String -> ShowS
    forall a. [a] -> [a] -> [a]
    ++ String
    "'")