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{-# LANGUAGE OverloadedStrings #-}
module GenPaths (genPaths) where
import Control.Applicative
import Control.Exception
import Control.Monad
import Data.List (isSuffixOf)
import Distribution.Package
import Distribution.PackageDescription
import Distribution.PackageDescription.Parse (readPackageDescription)
import Distribution.Verbosity (silent)
import Distribution.Version
import System.Directory
genPaths :: IO ()
genPaths = do
(nm,ver) <- getCabalFile >>= getNameVersion
let file = "Paths_" ++ nm ++ ".hs"
check file >> do
putStrLn $ "Writing " ++ file ++ "..."
writeFile file $ "module Paths_" ++ nm ++ " where\n"
++ "import Data.Version\n"
++ "\n"
++ "version :: Version\n"
++ "version = " ++ show ver ++ "\n"
where
check file = do
exist <- doesFileExist file
when exist . throwIO . userError $ file ++ " already exists"
getNameVersion :: FilePath -> IO (String,Version)
getNameVersion file = do
desc <- readPackageDescription silent file
let pkg = package . packageDescription $ desc
PackageName nm = pkgName pkg
name = map (trans '-' '_') nm
version = pkgVersion pkg
return (name, version)
where
trans c1 c2 c
| c == c1 = c2
| otherwise = c
getCabalFile :: IO FilePath
getCabalFile = do
cnts <- (filter isCabal <$> getDirectoryContents ".")
>>= filterM doesFileExist
case cnts of
[] -> throwIO $ userError "Cabal file does not exist"
cfile:_ -> return cfile
where
isCabal nm = ".cabal" `isSuffixOf` nm && length nm > 6
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