Provide a raw ByteString version of FilePath and environment APIs

The new module System.Posix.ByteString provides exactly the same API
as System.Posix, except that:

  - There is a new type: RawFilePath = ByteString

  - All functions mentioning FilePath in the System.Posix API
    use RawFilePath in the System.Posix.ByteString API

  - RawFilePaths are not subject to Unicode locale encoding and
    decoding, unlike FilePaths.  They are the exact bytes passed to and
    returned from the underlying POSIX API.

  - Similarly for functions that deal in environment
    strings (System.Posix.Env): these use untranslated ByteStrings
    in System.Posix.Environment

  - There is a new function

     System.Posix.ByteString.getArgs :: [ByteString]

    returning the raw untranslated arguments as passed to exec() when
    the program was started.

1 files changed, 43 insertions, 12 deletions

diff --git a/unix.cabal b/unix.cabal
index a6f95e4..d07f043 100644
--- a/unix.cabal
+++ b/unix.cabal
@@ -27,19 +27,10 @@ Cabal-Version: >= 1.6
 Library
     exposed-modules:
         System.Posix
-        System.Posix.DynamicLinker.Module
-        System.Posix.DynamicLinker.Prim
-        System.Posix.Directory
-        System.Posix.DynamicLinker
-        System.Posix.Env
+        System.Posix.ByteString
+
         System.Posix.Error
-        System.Posix.Files
-        System.Posix.IO
-        System.Posix.Process
-        System.Posix.Process.Internals
         System.Posix.Resource
-        System.Posix.Temp
-        System.Posix.Terminal
         System.Posix.Time
         System.Posix.Unistd
         System.Posix.User
@@ -47,7 +38,47 @@ Library
         System.Posix.Signals.Exts
         System.Posix.Semaphore
         System.Posix.SharedMem
-    build-depends:	base >= 4.2 && < 4.5
+
+        System.Posix.ByteString.FilePath
+
+        System.Posix.Directory
+        System.Posix.Directory.ByteString
+
+        System.Posix.DynamicLinker.Module
+        System.Posix.DynamicLinker.Module.ByteString
+        System.Posix.DynamicLinker.Prim
+        System.Posix.DynamicLinker.Common
+        System.Posix.DynamicLinker.ByteString
+        System.Posix.DynamicLinker
+
+        System.Posix.Files
+        System.Posix.Files.ByteString
+
+        System.Posix.IO
+        System.Posix.IO.ByteString
+
+        System.Posix.Env
+        System.Posix.Env.ByteString
+
+        System.Posix.Process
+        System.Posix.Process.Internals
+        System.Posix.Process.ByteString
+
+        System.Posix.Temp
+        System.Posix.Temp.ByteString
+
+        System.Posix.Terminal
+        System.Posix.Terminal.ByteString
+
+    other-modules:
+        System.Posix.Directory.Common
+        System.Posix.Files.Common
+        System.Posix.IO.Common
+        System.Posix.Process.Common
+        System.Posix.Terminal.Common
+
+    build-depends:      base >= 4.2 && < 4.5,
+                        bytestring >= 0.9.2.0 && < 0.10
     extensions: CPP, ForeignFunctionInterface, EmptyDataDecls
     if impl(ghc >= 7.1)
         extensions: NondecreasingIndentation