rewrote OSX library copier in Haskell, now with recursive copying of library deps

Build/OSXMkLibs.hs

@@ -0,0 +1,69 @@
+{- OSX library copier
+ -
+ - Copyright 2012 Joey Hess <joey@kitenet.net>
+ -
+ - Licensed under the GNU GPL version 3 or higher.
+ -}
+
+module Build.OSXMkLibs where
+
+import Control.Applicative
+import System.Environment
+import Data.Maybe
+import System.FilePath
+import System.Directory
+import System.IO
+import Control.Monad
+import Data.List
+
+import Utility.PartialPrelude
+import Utility.Directory
+import Utility.Process
+import Utility.Monad
+import Utility.SafeCommand
+import Utility.Path
+
+{- Recursively find and install libs, until nothing new to install is found. -}
+mklibs :: FilePath -> [FilePath] -> IO [FilePath]
+mklibs appbase libdirs = do
+	new <- catMaybes <$> installLibs appbase
+	if null new
+		then return (libdirs++new)
+		else mklibs appbase (libdirs++new)
+
+{- Returns directories into which new libs were installed. -}
+installLibs :: FilePath -> IO [Maybe FilePath]
+installLibs appbase = do
+	needlibs <- otool appbase
+	forM needlibs $ \lib -> do
+		let libdir = parentDir lib
+		let dest = appbase </> lib
+		ifM (doesFileExist dest)
+			( return Nothing
+			, do
+				createDirectoryIfMissing True (appbase </> libdir)
+				_ <- boolSystem "cp" [File lib, File dest]
+				return $ Just libdir
+			)
+
+otool :: FilePath -> IO [FilePath]
+otool appbase = do
+	files <- filterM doesFileExist =<< dirContentsRecursive appbase
+	s <- readProcess "otool" ("-L" : files)
+	return $ nub $ parseOtool s
+
+parseOtool :: String -> [FilePath]
+parseOtool = catMaybes . map parse . lines
+  where
+	parse l
+		| "\t" `isPrefixOf` l = headMaybe $ words l
+		| otherwise = Nothing
+
+main :: IO ()
+main = getArgs >>= go
+  where
+	go [] = error "specify OSXAPP_BASE"
+	go (appbase:_) = do
+		libdirs <- mklibs appbase []
+		writeFile (appbase </> "libdirs") $
+			unlines $ nub libdirs