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module Main (main) where
import Data.List
import Distribution.Simple
import Distribution.PackageDescription
import Distribution.PreProcess
import Distribution.Setup
import Distribution.Simple.LocalBuildInfo
import System.Environment
main :: IO ()
main = do args <- getArgs
let (ghcArgs, args') = extractGhcArgs args
(_, args'') = extractConfigureArgs args'
hooks = defaultUserHooks {
buildHook = add_ghc_options ghcArgs
$ buildHook defaultUserHooks }
withArgs args'' $ defaultMainWithHooks hooks
extractGhcArgs :: [String] -> ([String], [String])
extractGhcArgs = extractPrefixArgs "--ghc-option="
extractConfigureArgs :: [String] -> ([String], [String])
extractConfigureArgs = extractPrefixArgs "--configure-option="
extractPrefixArgs :: String -> [String] -> ([String], [String])
extractPrefixArgs prefix args
= let f [] = ([], [])
f (x:xs) = case f xs of
(wantedArgs, otherArgs) ->
case removePrefix prefix x of
Just wantedArg ->
(wantedArg:wantedArgs, otherArgs)
Nothing ->
(wantedArgs, x:otherArgs)
in f args
removePrefix :: String -> String -> Maybe String
removePrefix "" ys = Just ys
removePrefix _ "" = Nothing
removePrefix (x:xs) (y:ys)
| x == y = removePrefix xs ys
| otherwise = Nothing
type Hook a = PackageDescription -> LocalBuildInfo -> Maybe UserHooks -> a
-> IO ()
add_ghc_options :: [String] -> Hook a -> Hook a
add_ghc_options args f pd lbi muhs x
= do let lib' = case library pd of
Just lib ->
let bi = libBuildInfo lib
opts = options bi ++ [(GHC, args)]
bi' = bi { options = opts }
in lib { libBuildInfo = bi' }
Nothing -> error "Expected a library"
pd' = pd { library = Just lib' }
f pd' lbi muhs x
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