JuliaLang/julia

Redirect output to an IOBuffer

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#12,711 opened on Aug 20, 2015

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help wantedio

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Description

It'd be really nice to be able to redirect stdout/err to an IOBuffer:

julia> b = IOBuffer()
IOBuffer(data=UInt8[...], readable=true, writable=true, seekable=true, append=false, size=0, maxsize=Inf, ptr=1, mark=-1)

julia> redirect_stdout(b)
ERROR: MethodError: `redirect_stdout` has no method matching redirect_stdout(::Base.AbstractIOBuffer{Array{UInt8,1}})

I thought I saw another similar issue the other day, but was unable to locate it.

(Aside/another issue it would be nice to write this as a do block.)

Contributor guide

Research direction
Study the existing redirect stdout function in base/stream.jl and add a new method that accepts an IOBuffer. Also look at redirect stderr. Write tests and ensure it works with do block syntax.
Tech stack
julia
Domain
clideveloper experience
Issue type
Feature
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
2
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-3 hours
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
GitJulia
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
80