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Add rustfilt-like implementation - #95

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Mark-Simulacrum:add-rustfilt
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Add rustfilt-like implementation#95
Mark-Simulacrum wants to merge 1 commit into
rust-lang:mainfrom
Mark-Simulacrum:add-rustfilt

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@Mark-Simulacrum

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This is essentially trivial (no argument handling etc) but it would be enough for ~all of my use cases and is ~2x faster than published rustfilt due to the demangle_stream usage, which has landed upstream but hasn't been released.

@luser, would you be up for moving ownership of rustfilt on crates.io into my / T-compiler hands? I think if so, then it would make more sense to have a clean-room implementation of it (or re-license under MIT OR Apache), and then publish under that name.

If we don't hear back my suggestion is to move forward with this -- rustfilt has a few more features, e.g., support for file paths, --hashes, and demangling arguments rather than only stdin/stdout, but in my experience the implementation here is very often sufficient. This is basically zero effort to maintain, and we can (IMO) drop it if rustfilt is more actively maintained.

This is a much simpler implementation (no argument handling etc) but
suffices for ~all of my use cases and is ~2x faster (due to the
demangle_stream usage, which has landed upstream but hasn't been
released).
@luser

luser commented Sep 8, 2026

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@luser, would you be up for moving ownership of rustfilt on crates.io into my / T-compiler hands? I think if so, then it would make more sense to have a clean-room implementation of it (or re-license under MIT OR Apache), and then publish under that name.

I would be happy to hand it over! It has only ever been a thin wrapper around rustc_demangle anyway, I just found it useful for my day-to-day needs.

@luser

luser commented Sep 8, 2026

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Please let me know what I'd need to do to transfer ownership. I'm happy to transfer the repo into the rust-lang org if that would also be helpful.

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