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Make levenshtein distance case insensitive. #10224

Merged
merged 2 commits into from
Dec 24, 2021
Merged

Make levenshtein distance case insensitive. #10224

merged 2 commits into from
Dec 24, 2021

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MidasLamb
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When typing in a single character shortcut as a capital, it always
returns b as the suggestion as every one-letter abbreviation
is a lev distance 1 away from the capitalized one.
By making the levenshtein distance case insensitive, the case-mismatched
one-letter abbriviation (e.g. C to c) will be suggested, rather
than b

@MidasLamb
Make levenshtein distance case insensitive.
4252879 
When typing in a single character shortcut as a capital, it always
returns `b` as the suggestion as every one-letter abbreviation
is a lev distance 1 away from the capitalized one.
By making the levenshtein distance case insensitive, the case-mismatched
one-letter abbriviation (e.g. `C` to `c`) will be suggested, rather
than `b`
@rust-highfive
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Thanks for the pull request, and welcome! The Rust team is excited to review your changes, and you should hear from @alexcrichton (or someone else) soon.

Please see the contribution instructions for more information.

@rust-highfive rust-highfive added the S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. label Dec 21, 2021
@alexcrichton
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Thanks for the PR! Do you know if there's precedent for doing something like this? Do other levenshtein-using "did you mean" systems also do case-insensitive compares?

@MidasLamb
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I couldn't find any precedent for this, I just noticed that I accidentally had caps lock on and I found it weird that it would suggest b when I typed C.
Conceptually I find that C to c should have less distance than C to b, but for Levenshtein a change is a change, and there is no metric for "how far" the letters are apart that it needs to change into.
Potentially we could change the scoring such that changing capitalization has a cost (i.e. 0.5) as a special case, but that would be a bigger and more complex change (this basically does the same thing except with a cost of 0 for change of capitalization).

@alexcrichton
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Ok well at least seems reasonable to me. Can you add comments to the .to_lowercase() calls though as to why they're being made?

@MidasLamb
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Will do!

@joshtriplett
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Looks good to me!

@bors r+

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bors commented Dec 24, 2021

📌 Commit f0992e3 has been approved by joshtriplett

@bors bors added S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. and removed S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. labels Dec 24, 2021
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bors commented Dec 24, 2021

⌛ Testing commit f0992e3 with merge 1f12b88...

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bors commented Dec 24, 2021

☀️ Test successful - checks-actions
Approved by: joshtriplett
Pushing 1f12b88 to master...

@bors bors merged commit 1f12b88 into rust-lang:master Dec 24, 2021
@ehuss ehuss mentioned this pull request Jan 5, 2022
Merged
bors added a commit to rust-lang-ci/rust that referenced this pull request Jan 5, 2022
@bors
Auto merge of rust-lang#92567 - ehuss:update-cargo, r=ehuss
26c9b00 
Update cargo

10 commits in fcef61230c3b6213b6b0d233a36ba4ebd1649ec3..358e79fe56fe374649275ca7aebaafd57ade0e8d
2021-12-17 02:30:38 +0000 to 2022-01-04 18:39:45 +0000
- Make rmeta_required no longer depend on whether timing is enabled (rust-lang/cargo#10254)
- The first version of pull request template (rust-lang/cargo#10218)
- Stabilize the `strip` profile option, now that rustc has stable `-C strip` (rust-lang/cargo#10088)
- Update docs for windows ssh-agent. (rust-lang/cargo#10248)
- Fix typo: substract -> subtract (rust-lang/cargo#10244)
- timings: Fix tick mark alignment (rust-lang/cargo#10239)
- Remove unused lifetimes (rust-lang/cargo#10238)
- Make levenshtein distance case insensitive. (rust-lang/cargo#10224)
- [docs] Adds basic CI yaml for GitHub Actions (rust-lang/cargo#10212)
- Add function for parsing already-read manifest (rust-lang/cargo#10209)
@ehuss ehuss added this to the 1.59.0 milestone Feb 6, 2022
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@MidasLamb @rust-highfive @alexcrichton @joshtriplett @bors @ehuss