Remove most Setup.hs hacks

Setup.hs

@@ -1,107 +1,9 @@
 #!/usr/bin/env runhaskell
-{-# LANGUAGE RecordWildCards, NamedFieldPuns #-}
+
 import Distribution.Simple
-import Distribution.Simple.Utils
-import Distribution.Simple.Setup
-import Distribution.Simple.Install
 import Distribution.Simple.Program
-import Distribution.Simple.Register
-import Distribution.Simple.BuildPaths
-import qualified Distribution.Simple.InstallDirs as ID
-import Distribution.Simple.LocalBuildInfo
-import Distribution.PackageDescription
-
-import qualified Data.Map as M
-import Data.Map (Map)
-
-import Control.Arrow
-import Control.Applicative
-import Control.Monad
-import Data.List
-import Data.Maybe
-import Data.Version
-import Data.Monoid
-import System.Process
-import System.Exit
-import System.FilePath
-import System.Directory (renameFile)
 
 main :: IO ()
 main = defaultMainWithHooks $ simpleUserHooks {
-   instHook = inst,
-   copyHook = copy,
-   buildHook = \pd lbi hooks flags -> (buildHook simpleUserHooks) pd (patchLibexecdir lbi) hooks flags,
    hookedPrograms = [ simpleProgram "shelltest" ]
  }
-
-patchLibexecdir :: LocalBuildInfo -> LocalBuildInfo
-patchLibexecdir lbi = let
-    idirtpl     = installDirTemplates lbi
-    libexecdir' = toPathTemplate $ fromPathTemplate (libexecdir idirtpl) </> "$abi/$pkgid"
-    lbi' = lbi { installDirTemplates = idirtpl { libexecdir = libexecdir' } }
-  in
-    lbi'
-
--- mostly copypasta from 'defaultInstallHook'
-inst ::
-    PackageDescription -> LocalBuildInfo -> UserHooks -> InstallFlags -> IO ()
-inst pd lbi _uf ifl = do
-  let copyFlags = defaultCopyFlags {
-                      copyDistPref   = installDistPref ifl,
-                      copyDest       = toFlag NoCopyDest,
-                      copyVerbosity  = installVerbosity ifl
-                  }
-  xInstallTarget pd lbi copyFlags (\pd' lbi' -> install pd' lbi' copyFlags)
-  let registerFlags = defaultRegisterFlags {
-                          regDistPref  = installDistPref ifl,
-                          regInPlace   = installInPlace ifl,
-                          regPackageDB = installPackageDB ifl,
-                          regVerbosity = installVerbosity ifl
-                      }
-  when (hasLibs pd) $ register pd lbi registerFlags
-
-copy :: PackageDescription -> LocalBuildInfo -> UserHooks -> CopyFlags -> IO ()
-copy pd lbi _uh cf =
-    xInstallTarget pd lbi cf (\pd' lbi' -> install pd' lbi' cf)
-
-xInstallTarget :: PackageDescription
-               -> LocalBuildInfo
-               -> CopyFlags
-               -> (PackageDescription -> LocalBuildInfo -> IO ())
-               -> IO ()
-xInstallTarget pd lbi cf fn = do
-  let (extended, regular) = partition isInternal (executables pd)
-
-  let pd_regular = pd { executables = regular }
-
-  _ <- flip mapM extended $ \exe -> do
-    let pd_extended = onlyExePackageDesc [exe] pd
-    fn pd_extended lbi
-
-    let lbi' = patchLibexecdir lbi
-        copydest  = fromFlag (copyDest cf)
-        verbosity = fromFlag (copyVerbosity cf)
-        InstallDirs { bindir, libexecdir } = absoluteInstallDirs pd lbi' copydest
-        progprefix = substPathTemplate (packageId pd) lbi (progPrefix lbi)
-        progsuffix = substPathTemplate (packageId pd) lbi (progSuffix lbi)
-        fixedExeBaseName = progprefix ++ exeName exe ++ progsuffix
-
-        fixedExeFileName = bindir </> fixedExeBaseName <.> exeExtension
-        newExeFileName   = libexecdir </> fixedExeBaseName <.> exeExtension
-
-    when (exeName exe == "ghc-mod-real") $ do
-        createDirectoryIfMissingVerbose verbosity True libexecdir
-        renameFile fixedExeFileName newExeFileName
-
-  fn pd_regular lbi
-
- where
-   isInternal :: Executable -> Bool
-   isInternal exe =
-    fromMaybe False $ (=="True") <$> lookup "x-internal" (customFieldsBI $ buildInfo exe)
-
-onlyExePackageDesc :: [Executable] -> PackageDescription -> PackageDescription
-onlyExePackageDesc exes pd = emptyPackageDescription {
-                     package = package pd
-                   , executables = exes
-                   }

ghc-mod.cabal

@@ -92,7 +92,7 @@ Extra-Source-Files:     ChangeLog
 
 Custom-Setup
   Setup-Depends:         base
-                       , Cabal >= 1.18 && < 1.25
+                       , Cabal >= 1.18 && < 2.1
                        , containers
                        , filepath
                        , directory