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1Clear out junk files and repair common Windows errors2Fix the driver behind crashes, sound loss and screen glitches3Repair Windows errors before they cause bigger problemsalofmt is a configurable Ruby source formatter written in Rust and powered by Prism. It can format Ruby files in place, check whether they already match the formatter’s output, or show proposed changes. It is pre-1.0 software, so check its support for the syntax used in your project before relying on it.
What alofmt does
alofmt takes Ruby source with compact or inconsistent layout and formats it into a more structured style. Its documentation illustrates multiline formatting for constructs including chained expressions, blocks, hashes, and comments, but does not promise identical coverage for every Ruby construct.
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The project offers both a command-line formatter and a Rust library interface. The documentation reviewed identifies version 0.1.0, dated August 28, 2026, and says the project is available under the MIT license. Project documentation
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The documented source installation route uses Cargo:
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cargo install --locked alofmtFrom a project directory, choose the command that matches what you want to do:
| Goal | Command | Effect |
|---|---|---|
| Format files | alofmt --write . |
Formats discovered Ruby files in place. |
| Check formatting | alofmt --check . |
Checks formatting without changing files. |
| Review proposed formatting | alofmt --check --diff . |
Shows proposed changes while checking. |
For a single file, running alofmt without --write or --check prints formatted output. Use - as the input to read source from standard input. The tool discovers .rb and .rbi files, respects .gitignore, and formats files in parallel. These are documented behaviors, not a quantified performance claim. Project documentation
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How to configure formatting
alofmt reads settings from .alofmt.toml. It searches the current directory and its parent directories for the nearest configuration file; command-line options take precedence over configuration values for that run.
Documented settings include line_width, indent_width, quote_style, and trailing_commas. The stated defaults include two-space indentation and preserving existing quotes. Check the project documentation for the accepted values and complete configuration syntax before adding a file to a repository. Project documentation
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What Ruby syntax does it support?
The project describes support for a broad, growing portion of Ruby syntax, not complete Ruby syntax coverage. alofmt is powered by Prism, and the documentation says unsupported Prism nodes return an error rather than being partially or lossily formatted.
That failure behavior is useful to know before adopting it in a formatter workflow: test it on the syntax your application and tooling actually use, including any Ruby interface files you intend it to process. The reviewed documentation does not provide a Ruby-version compatibility matrix, so it does not establish compatibility for every Ruby release. Project documentation
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Using alofmt from Rust
Developers building Rust tools around Ruby source can use alofmt’s library interface. The documented API includes format_with_options and a FormatOptions structure; the docs also describe allocation-free checks. Consult the API documentation for signatures and integration details. Project documentation
What to verify before adopting it
- Run it against a representative part of your codebase and note whether the Ruby constructs you use are supported.
- Review a diff before applying formatting broadly, particularly when introducing a new formatter to an existing repository.
- Decide whether formatting should be an explicit local action or a check in your automated workflow; use
--writeto modify files and--checkto check without changing them. - Set project-wide conventions in
.alofmt.tomlwhen the documented options meet your needs, and account for any command-line overrides used by scripts.
The documentation promotes speed and parallel processing but gives no benchmark figures, test methodology, or comparison with other formatters. The reviewed material therefore does not establish a measured speed advantage. Project documentation
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