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[SR-9918] FileHandle should conform to TextOutputStream #3538

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sindresorhus opened this issue Feb 13, 2019 · 3 comments
Open

[SR-9918] FileHandle should conform to TextOutputStream #3538

sindresorhus opened this issue Feb 13, 2019 · 3 comments
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Foundation New Feature

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@sindresorhus
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Previous ID SR-9918
Radar rdar://problem/48032239
Original Reporter @sindresorhus
Type New Feature
Additional Detail from JIRA
Votes 0
Component/s Foundation
Labels New Feature
Assignee None
Priority Medium

md5: 1fba25807ce87df0c8054a24e5f11a3f

Issue Description:

That would make it easier to work with stdout, stderr, and other file handles. For example, using stderr with `print()` [1].

Currently, every project has to include this extension:

extension FileHandle: TextOutputStream {
    public func write(_ string: String) {
        write(string.data(using: .utf8)!)
    }
}

And then it can be used like this:

var standardError = FileHandle.standardError
print("foo", to: &standardError)

Relevant Stack Overflow question: https://stackoverflow.com/questions/24041554/how-can-i-output-to-stderr-with-swift

[1]: https://forums.swift.org/t/rework-print-by-adding-observable-standardoutput-and-standarderror-streams-to-standard-library/7775/3
@belkadan
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cc @millenomi, @milseman

@millenomi
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Contributor

I like it, and I'll see what timeframe can have this if we do it. But as with all requests that add API surface, we can take feedback, but promise nothing.

@milseman
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Mannequin

milseman mannequin commented Feb 13, 2019

SGTM. Also, it seems kinda weird that there's no way to access stderr in the standard library, and no way to name stdout/stderr.

@swift-ci swift-ci transferred this issue from apple/swift-issues Apr 25, 2022
@shahmishal shahmishal transferred this issue from apple/swift May 5, 2022
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@millenomi @sindresorhus @belkadan