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#!/usr/bin/env runhaskell
{-# LANGUAGE MultiParamTypeClasses, FlexibleInstances #-}
import Distribution.Simple
import Distribution.PackageDescription
import Distribution.Version
import Distribution.Simple.LocalBuildInfo
import Distribution.Simple.Program
import Distribution.Verbosity
import Data.Char (isSpace)
import Data.List (dropWhile,reverse)
import Data.String (fromString)
import Control.Monad
main = defaultMainWithHooks simpleUserHooks {
hookedPrograms = [pgconfigProgram],
confHook = \pkg flags -> do
lbi <- confHook simpleUserHooks pkg flags
bi <- psqlBuildInfo lbi
return lbi {
localPkgDescr = updatePackageDescription
(Just bi, [(fromString "runtests", bi)]) (localPkgDescr lbi)
}
}
-- 'ConstOrId' is a @Cabal-1.16@ vs @Cabal-1.18@ compatibility hack,
-- 'programFindLocation' has a new (unused in this case)
-- parameter. 'ConstOrId' adds this parameter when types say it is
-- mandatory.
class FindProgramLocation a b where
constOrId :: a -> b
instance FindProgramLocation (IO (Maybe FilePath)) (IO (Maybe FilePath)) where
constOrId = id
instance FindProgramLocation (IO (Maybe FilePath)) (ProgramSearchPath -> IO (Maybe FilePath)) where
constOrId = const
instance FindProgramLocation (IO (Maybe FilePath)) (ProgramSearchPath -> IO (Maybe (FilePath, [FilePath]))) where
constOrId x = liftM (fmap (\x -> (x, []))) . const x
pgconfigProgram = (simpleProgram "pgconfig or pg_config") {
programFindLocation = \verbosity -> constOrId $ do
pgconfig <- findProgramLocation verbosity "pgconfig"
pg_config <- findProgramLocation verbosity "pg_config"
return (pgconfig `mplus` pg_config)
}
psqlBuildInfo :: LocalBuildInfo -> IO BuildInfo
psqlBuildInfo lbi = do
(pgconfigProg, _) <- requireProgram verbosity
pgconfigProgram (withPrograms lbi)
let pgconfig = rawSystemProgramStdout verbosity pgconfigProg
incDir <- pgconfig ["--includedir"]
libDir <- pgconfig ["--libdir"]
return emptyBuildInfo {
extraLibDirs = [strip libDir],
includeDirs = [strip incDir]
}
where
verbosity = normal -- honestly, this is a hack
strip x = dropWhile isSpace $ reverse $ dropWhile isSpace $ reverse x