head thoughts

[tonymorris]

TODO

• make _ExitSuccess more polymorphic 7454505
• Replicate System.Process module, with these differences
  • Write classy lenses for CreateProcess.
  • Write classy prisms for StdStream.
  • Write classy prisms for CmdSpec.
  • Export data types but not fields or functions.
  • Rewrite fields and functions with the same name, but:
    • polymorphic (i.e. use the classy lens) and using better ExitCode structure.
    • Use MaybeT instead of IO (Maybe X).