Whats the best way to spawn an external process with vibe and process its stdout and stderr

[christian.koestlin]

Recently I wanted to wrap a small d program around an external 
process and stream its stdout/stderr to the original 
stdout/stderr of the d program (no other output while the 
external process is running).

I first tried to implement this with vibe's fibers, but after 
failing first try, I resolved to std.concurrency to get the thing 
done.

It's not a bad solution, but a fiber based thing should be so 
much nicer, so I tried again in an isolated project 
(https://github.com/gizmomogwai/vibe-process).

Unfortunately my `v0` looks nice, but does not process the output 
as it should.
`v2` is my favorite, but far aways from the clean solution of 
`v0`.

So the question is, how to make a nicer solution, that also 
really cleans up in the end.

Kind regards,
Christian