rust-lang / rust-lang/libs-team
REQUEST: Implement fmt::LowerHex and fmt::UpperHex for Vec<u8> and [u8].
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- Dominant language
- Rust
- Stars
- 178
- Forks
- 28
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- Merged PRs (30d)
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Description
Problem
Printing byte strings as hex is a very common thing to do. Currently we need to implement is manually or use a third-party crate like hex.
We have the hex traits in fmt though, currently only implemented on integer types. I figured we couldn't have them on Vec<u8> because maybe it was generically implemented on Vec<impl fmt::LowerHex>, but that's not the case.
Is there a reason this isn't done?
Proposed Solution
Implement fmt::LowerHex and fmt::UpperHex for Vec and [u8].
Notes
No response
Contributor guide
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First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Start by locating the existing fmt::LowerHex and fmt::UpperHex implementations for integer types and the relevant Vec and [u8] entry points. Add coverage to the relevant formatting tests and verify that both byte-string types produce the expected lower- and uppercase hexadecimal output.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- rust
- Domain
- backend
- Issue type
- Feature
- Difficulty
- 3/5
- Estimated time
- 1-2 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 45/100