-getMustBeBuildablePackages :: IO [String]
-getMustBeBuildablePackages
- = do xs <- readFile "../core-packages"
- return $ filter ("readline" /=) $ lines xs
+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 ((2 == ) . length) $ map words nonCommentLines
+ requiredLibraries = [ x | 'l':'i':'b':'r':'a':'r':'i':'e':'s':'/':x
+ <- map head requiredLines ]
+ return $ filter ("editline" /=) requiredLibraries