Proposal: overhaul System.Process

[Duncan Coutts]

On Tue, 2008-04-22 at 15:52 -0700, Don Stewart wrote:
> duncan.coutts:

> > > > I would have thought (ExitCode,String) was more appropriate.
> > > 
> > > Yes, definitely.
> > 
> > Yes, I mentioned this to Don previously when he published his popen
> > code. I think he agreed.

> I'd changed, but not pushed out, process-light:

> readProcess :: FilePath                     -- ^ command to run
>             -> [String]                     -- ^ any arguments
>             -> String                       -- ^ standard input
>             -> IO (Either (ExitCode,String) String)  -- ^ either the stdout, or an exitcode and any output

You don't need the Either. ExitCode already covers the case when the
process terminates successfully.

Duncan