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README.md
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README.md
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> **Source code spell checker**
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Finds and corrects spelling mistakes among source code:
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- Fast enough to run on monorepos
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- Low false positives so you can run on PRs
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[](https://dev.azure.com/crate-ci/crate-ci/_build/latest?definitionId=11&branchName=master)
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[](https://codecov.io/gh/crate-ci/typos)
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[][Documentation]
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[](https://crates.io/crates/typos)
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## [About](docs/about.md)
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Dual-licensed under [MIT](LICENSE-MIT) or [Apache 2.0](LICENSE-APACHE)
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## [Install](docs/install.md)
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## Documentation
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## [Reference](docs/reference.md)
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- [Installation](#install)
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- [Reference](docs/reference.md)
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- [Comparison with other spell checkers](docs/comparison.md)
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- [Benchmarks](benchsuite/runs)
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- [Design](docs/design.md)
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- [Contribute](CONTRIBUTING.md)
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- [CHANGELOG](CHANGELOG.md)
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## [Contribute](CONTRIBUTING.md)
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## Install
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## License
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[Download](https://github.com/crate-ci/typos/releases) a pre-built binary
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(installable via [gh-install](https://github.com/crate-ci/gh-install).
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Licensed under either of
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* Apache License, Version 2.0, ([LICENSE-APACHE](LICENSE-APACHE) or http://www.apache.org/licenses/LICENSE-2.0)
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* MIT license ([LICENSE-MIT](LICENSE-MIT) or http://opensource.org/licenses/MIT)
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at your option.
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Or use rust to install:
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```bash
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cargo install typos-cli
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```
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[Crates.io]: https://crates.io/crates/typos-cli
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[Documentation]: https://docs.rs/typos
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# About `typos`
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## Design Requirements
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Spell checks source code:
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- Requires special word-splitting logic to handle situations like hex (`0xDEADBEEF`), `c\nescapes`, `snake_case`, `CamelCase`, `SCREAMING_CASE`, and maybe `arrow-case`.
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- Each programming language has its own quirks, like abbreviations, lack of word separator (`copysign`), etc
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- Backwards compatibility might require keeping misspelled words.
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- Case for proper nouns is irrelevant.
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Checking for errors in a CI:
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- No false-positives.
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- On spelling errors, sets the exit code to fail the CI.
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Quick feedback and resolution for developer:
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- Fix errors for the user.
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- Integration into other programs, like editors:
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- `fork`: easy to call into and provides a stable API, including output format
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- linking: either in the language of choice or bindings can be made to language of choice.
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## Design Trade Offs
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### typos uses a blacklist
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Blacklist: Known typos that map to their corresponding word
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- Ignores unknown typos
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- Ignores typos that follow c-escapes if they aren't handled correctly
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Whitelist: A confidence rating is given for how close a word is to one in the whitelist
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- Sensitive to false positives due to hex numbers and c-escapes
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- Traditional spell checkers use a whitelist.
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## Related Spell Checkers
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See also [benchmarks](../benchsuite/runs).
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# Related Spell Checkers
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| | typos | [bloom42/misspell][misspell-rs] | [client9/misspell][misspell-go] | [codespell] | [scspell3k] |
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|----------------|-----------------------|---------------------------------|---------------------------------|-------------|-------------|
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@ -53,6 +19,8 @@ See also [benchmarks](../benchsuite/runs).
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| API | Rust / [JSON Lines] | Rust | ? | Python | None |
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| License | MIT or Apache | AGPL | MIT | GPLv2 | GPLv2 |
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See also [benchmarks](../benchsuite/runs).
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[JSON Lines]: http://jsonlines.org/
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[scspell3k]: https://github.com/myint/scspell
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[misspell-rs]: https://gitlab.com/bloom42/misspell
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32
docs/design.md
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32
docs/design.md
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# Design
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## Requirements
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Spell checks source code:
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- Requires special word-splitting logic to handle situations like hex (`0xDEADBEEF`), `c\nescapes`, `snake_case`, `CamelCase`, `SCREAMING_CASE`, and maybe `arrow-case`.
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- Each programming language has its own quirks, like abbreviations, lack of word separator (`copysign`), etc
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- Backwards compatibility might require keeping misspelled words.
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- Case for proper nouns is irrelevant.
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Checking for errors in a CI:
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- No false-positives.
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- On spelling errors, sets the exit code to fail the CI.
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Quick feedback and resolution for developer:
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- Fix errors for the user.
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- Integration into other programs, like editors:
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- `fork`: easy to call into and provides a stable API, including output format
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- linking: either in the language of choice or bindings can be made to language of choice.
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## Trade Offs
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### typos uses a blacklist
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Blacklist: Known typos that map to their corresponding word
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- Ignores unknown typos
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- Ignores typos that follow c-escapes if they aren't handled correctly
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Whitelist: A confidence rating is given for how close a word is to one in the whitelist
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- Sensitive to false positives due to hex numbers and c-escapes
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- Traditional spell checkers use a whitelist.
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@ -1,11 +0,0 @@
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# Install
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[Download](https://github.com/crate-ci/typos/releases) a pre-built binary
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(installable via [gh-install](https://github.com/crate-ci/gh-install).
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Or use rust to install:
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```bash
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cargo install typos-cli
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```
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