JuliaLang/julia

Redirect output to an IOBuffer

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#12,711 opened on Aug 20, 2015

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 (19 comments) (20 reactions) (0 assignees)Julia (48,709 stars) (5,773 forks)batch import
help wantedio

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

Tech stack
None
Domain
developer experience
Issue type
feature
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
half day
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
stale
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
clear
Prerequisites
Basic understanding of Julia I/OFamiliarity with IOBuffer
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
45
Research direction
Examine the base I/O stream implementation in Julia, likely in base/stream.jl, to understand how redirect stdout currently works. The goal is to add a method that accepts an IOBuffer. Check the issue comments for any proposed solutions or discussions. Consider also adding support for a do block syntax as mentioned in the aside.