HList-0.4.0.0: Setup.lhs

#!/usr/bin/runhaskell
\begin{code}
{-# OPTIONS_GHC -Wall #-}
module Main (main) where

import Language.Haskell.Extension
    ( Extension(EnableExtension, UnknownExtension, DisableExtension) )
import Data.List ( nub )
import Data.Version ( showVersion )
import Distribution.Package
    ( PackageName(PackageName),
      PackageId,
      InstalledPackageId,
      packageVersion,
      packageName )
import Distribution.PackageDescription ()
import Distribution.Simple
    ( defaultMainWithHooks, UserHooks(..), simpleUserHooks )
import Distribution.Simple.Utils
    ( rewriteFile, createDirectoryIfMissingVerbose )
import Distribution.Simple.BuildPaths ( autogenModulesDir )
import Distribution.Simple.Setup ()
import Distribution.Simple.LocalBuildInfo ()
import System.FilePath ( (</>) )
import Distribution.Verbosity ( Verbosity )
import Distribution.PackageDescription ()
import Distribution.Simple.LocalBuildInfo ()
import Distribution.PackageDescription
    ( TestSuite(testName),
      PackageDescription,
      Library(libBuildInfo),
      allExtensions )
import Distribution.Simple.Compiler ()
import Distribution.Simple.Setup
    ( BuildFlags(buildVerbosity),
      ConfigFlags(..),
      Flag(Flag, NoFlag),
      fromFlag )
import Distribution.Simple.LocalBuildInfo
    ( LocalBuildInfo(configFlags),
      ComponentLocalBuildInfo(componentPackageDeps),
      withTestLBI,
      withLibLBI )
import Data.Maybe

main :: IO ()
main = defaultMainWithHooks simpleUserHooks
  { buildHook = \pkg lbi hooks flags -> do
     generateBuildModule (fromFlag (buildVerbosity flags)) pkg lbi
     buildHook simpleUserHooks pkg lbi hooks flags
  }

generateBuildModule :: Verbosity -> PackageDescription -> LocalBuildInfo -> IO ()
generateBuildModule verbosity pkg lbi = do
  let dir = autogenModulesDir lbi
  createDirectoryIfMissingVerbose verbosity True dir
  withLibLBI pkg lbi $ \ lib libcfg -> do
    withTestLBI pkg lbi $ \suite suitecfg -> do
      rewriteFile (dir </> "Build_" ++ testName suite ++ ".flags") $ unlines $
        [ hc , unwords (formatdeps (testDeps libcfg suitecfg) ++ exts lib) ]
  where
    hc = case configHcPath (configFlags lbi) of
            Flag a -> a
            NoFlag -> fromMaybe "ghc" (lookup "ghc" (configProgramPaths (configFlags lbi)))
    formatdeps = map (formatone . snd)
    formatone p = case packageName p of
      PackageName n -> "-package=" ++ n ++ "-" ++ showVersion (packageVersion p)

    exts lib = [ "-X" ++ se
                    | e <- allExtensions (libBuildInfo lib),
                      Just se <- [case e of
                        EnableExtension x -> Just (show x)
                        UnknownExtension x -> Just x
                        DisableExtension x -> Just ("No" ++ show x)
                  ]
                ]

testDeps :: ComponentLocalBuildInfo -> ComponentLocalBuildInfo -> [(InstalledPackageId, PackageId)]
testDeps xs ys = nub $ componentPackageDeps xs ++ componentPackageDeps ys


\end{code}
Adapted from:

Copyright 2012-2015 Edward Kmett

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   may be used to endorse or promote products derived from this software
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