A pass-through option for IOCapture

Internals & Design
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2

I came up with the start of a possible implementation at Allow pass-through of output by goerz · Pull Request #20 · JuliaDocs/IOCapture.jl · GitHub

The core of it is this snippet:

output = IOBuffer()
temp = IOBuffer()
buffer_redirect_task = @async begin
    write(temp, pipe)
    temp_data = take!(temp)
    write(output, temp_data)
    write(default_stdout, temp_data)
end

See also my comment at Add a `tee` option · Issue #19 · JuliaDocs/IOCapture.jl · GitHub

If there’s any low-level IO expert who could weigh in on whether this is a sane approach, please leave a comment on the issue or PR.

I also played around a little with the Tee struct from Write to file and stdout - #3 by Tamas_Papp, but it doesn’t seem like redirect_stdout can be called with a Tee object. If someone knows how to define the appropriate method of redirect_stdout to make that work, that would still be a possible alternative.

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