0efd4183e1
Examples on how to add ghc extra_libs, libraries from hackage are included svn path=/nixpkgs/trunk/; revision=10565
48 lines
2 KiB
Haskell
48 lines
2 KiB
Haskell
-- packages: filepath,Cabal,directory
|
|
{-# OPTIONS_GHC -fglasgow-exts #-}
|
|
module Main where
|
|
import Distribution.InstalledPackageInfo (InstalledPackageInfo (..))
|
|
import Distribution.Package (showPackageId)
|
|
import System.FilePath
|
|
import System.Environment
|
|
import System.Directory
|
|
import System.IO
|
|
import System.Exit
|
|
import Data.List
|
|
|
|
usage = unlines [
|
|
" usage a) <app-name> split in_path out_path"
|
|
, " b) <app-anme> join out_path"
|
|
, "This small helper executable servers two purposes:"
|
|
, "a) split the main package db created by ghc installation into single libs"
|
|
, " so that nix can add them piecwise as needed to buildInputs"
|
|
, "b) merge databases into one single file, so when building a library"
|
|
, " we can create one db containing all dependencies passed by GHC_PACKAGE_PATH"
|
|
, " I think this is a better solution than patching and mantaining cabal so"
|
|
, " that it support GHC_PACKAGE_PATH (not only by accident) ?"
|
|
]
|
|
|
|
mySplit :: (Eq Char) => [Char] ->[[ Char ]]
|
|
mySplit [] = []
|
|
mySplit list = let (l, l') = span (not . (`elem` ":;")) list
|
|
in l: mySplit (drop 1 l')
|
|
|
|
myReadFile f = doesFileExist f >>= \fe ->
|
|
if fe then readFile f
|
|
else do hPutStrLn stderr $ "unable to read file " ++ f
|
|
exitWith (ExitFailure 1)
|
|
|
|
main = do
|
|
args <- getArgs
|
|
case args of
|
|
["split", inFile, outDir] -> do
|
|
-- prior to 6.9.x (when exactly) this must be InstalledPackageInfo only (not InstalledPackageInfo_ String)
|
|
-- (packagedb :: [InstalledPackageInfo_ String] ) <- fmap read $ myReadFile inFile
|
|
(packagedb :: [InstalledPackageInfo] ) <- fmap read $ myReadFile inFile
|
|
mapM_ (\pi -> let fn = outDir </> (showPackageId $ package pi) ++ ".conf"
|
|
in writeFile fn (show [pi])
|
|
) packagedb
|
|
["join", outpath] -> do
|
|
getEnv "GHC_PACKAGE_PATH" >>= mapM myReadFile . nub . mySplit
|
|
>>= writeFile outpath . show . concat . map (read :: String -> [InstalledPackageInfo])
|
|
_ -> putStrLn usage
|