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-- Returns exitcode 0 if the given package is buildable or is a boot package,
-- and 1 otherwise.
module Main (main) where
import Control.Monad
import System.Directory
import System.Environment
import System.Exit
import System.IO
main :: IO ()
main = do args <- getArgs
case args of
[packagesFile, package] ->
doit packagesFile package
_ ->
error "Syntax: ifBuildable <packages-file> <package>"
doit :: FilePath -> String -> IO ()
doit packagesFile package
= do setCurrentDirectory package
unbuildable <- doesFileExist "unbuildable"
if not unbuildable
then exitWith ExitSuccess
else do mustBeBuildables <- getMustBeBuildables packagesFile
if package `elem` mustBeBuildables
then exitWith ExitSuccess
else do hPutStrLn stderr "Warning: Package is unbuildable"
exitWith (ExitFailure 1)
getMustBeBuildables :: FilePath -> IO [String]
getMustBeBuildables packagesFile
= do xs <- readFile packagesFile
let nonCommentLines = filter (("#" /=) . take 1) $ lines xs
requiredLines = filter ((3 == ) . length) $ map words nonCommentLines
requiredLibraries = [ x | 'l':'i':'b':'r':'a':'r':'i':'e':'s':'/':x
<- map head requiredLines ]
return $ filter ("editline" /=) requiredLibraries
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