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

module Distribution.Types.BenchmarkInterface (
    BenchmarkInterface(..),
) where

import Prelude ()
import Distribution.Compat.Prelude

import Distribution.Types.BenchmarkType
import Distribution.Version

-- | The benchmark interfaces that are currently defined. Each
-- benchmark must specify which interface it supports.
--
-- More interfaces may be defined in future, either new revisions or
-- totally new interfaces.
--
data BenchmarkInterface =

     -- | Benchmark interface \"exitcode-stdio-1.0\". The benchmark
     -- takes the form of an executable. It returns a zero exit code
     -- for success, non-zero for failure. The stdout and stderr
     -- channels may be logged. It takes no command line parameters
     -- and nothing on stdin.
     --
     BenchmarkExeV10 Version FilePath

     -- | A benchmark that does not conform to one of the above
     -- interfaces for the given reason (e.g. unknown benchmark type).
     --
   | BenchmarkUnsupported BenchmarkType
   deriving (Eq, Generic, Read, Show, Typeable, Data)

instance Binary BenchmarkInterface

instance Monoid BenchmarkInterface where
    mempty  =  BenchmarkUnsupported (BenchmarkTypeUnknown mempty nullVersion)
    mappend = (<>)

instance Semigroup BenchmarkInterface where
    a <> (BenchmarkUnsupported _) = a
    _ <> b                        = b