To format only specific Ruby files with rubyfmt, name those paths on the command line—for example, rubyfmt -i lib/a.rb lib/b.rb rewrites those files in place. For broader runs, use .rubyfmtignore or rubyfmt’s Git-ignore and header options to control which files are included. Formatting selected files is different from formatting selected lines inside a file, which the Formatto VS Code extension supports only experimentally.
Install rubyfmt
The rubyfmt project README describes it as “A fast, opinionated Ruby formatter written in Rust.” It documents installation through Homebrew or by building from source with Cargo and putting the resulting executable on your PATH. Homebrew lists the package as a Ruby autoformatter and links to the official rubyfmt repository. Check the README and your installed version’s command-line help for current installation details.
Format only named files from the command line
Passing explicit paths is the simplest way to avoid formatting the rest of a project. The official rubyfmt README documents these command forms:
| Command | Result |
|---|---|
rubyfmt lib/a.rb lib/b.rb |
Formats the named files and writes formatted output to standard output. |
rubyfmt -i lib/a.rb lib/b.rb |
Formats the named files in place. |
rubyfmt -c lib/a.rb lib/b.rb |
Shows a diff for the named files. |
Use -c when you want to inspect proposed changes before deciding whether to write them. Use -i only when you intend to modify the specified files. The README also documents passing directories to process multiple files; directory-wide discovery is broader than naming individual paths, so apply ignore controls before using it on a project tree.
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Exclude files from directory-wide formatting
Use a rubyfmt ignore file
Create a .rubyfmtignore file at the repository root and list paths or patterns using .gitignore syntax. This is useful for excluding generated files or directories when you want to format a wider part of the project without naming every file individually.
Account for Git-ignored files
rubyfmt respects .gitignore by default, so files ignored by Git are normally omitted during discovery. Pass --include-gitignored when you specifically want rubyfmt to include files that Git ignore rules would otherwise exclude. The behavior and options are documented in the project README.
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Opt files in or out with header comments
rubyfmt can use a comment at the top of a file as a per-file formatting control, but the control takes effect only when its matching command-line flag is enabled.
- For an opt-in workflow, place
# rubyfmt: trueat the top of files eligible for formatting, then run rubyfmt with--header-opt-in. - For an opt-out workflow, put
# rubyfmt: falseat the top of files to skip, then use--header-opt-out.
These are alternative policies: choose the one that fits the repository. A header comment by itself does not activate either policy; the corresponding CLI option does. See the rubyfmt README for the documented options.
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Format changed Ruby files in VS Code
The Formatto extension supports rubyfmt and provides a Format Pending Changes command for modified Ruby files in open Git repositories. Because the command operates on files on disk, save unsaved editor changes first; otherwise, those buffer edits are not included in the pending-changes operation.
- Install and configure Formatto in VS Code, then confirm that rubyfmt is the selected formatter. The extension defaults to rubyfmt.
- Save any modified files whose current buffer contents you want formatted.
- Run Format Pending Changes to format modified Ruby files in the open Git repository.
For an individual document, use VS Code’s Format Document command or enable Format on Save after configuring the extension. The extension lists .rb, .rbs, .rbi, .gemspec, and .podspec among the supported rubyfmt file extensions.
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Configure Formatto’s rubyfmt options
Formatto’s settings let you choose a formatter, set formatto.rubyfmtPath if the executable is not found at the expected location, add rubyfmt arguments such as --header-opt-in, and define exclusions with formatto.excludePatterns. Consult the Formatto extension listing for the extension’s current settings and instructions.
Can rubyfmt format only selected lines?
Choosing files to format is a supported command-line workflow; formatting an arbitrary selection of lines within a file is a different operation. Formatto’s range formatting is experimental and heuristic. An incomplete or syntactically broken selection may not change, and formatting a range can produce output different from formatting the entire document. The extension documentation notes that Ruby formatters normally work on complete, syntactically valid code, so do not rely on range formatting as a dependable substitute for whole-file formatting.
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Does rubyfmt use a style configuration file?
The official rubyfmt README reviewed for this guide documents file paths and directories, ignore behavior, and optional header controls; it does not describe a general style configuration file. Do not assume a .rubyfmt.yml file configures this project: a similarly named rfmt project is a different formatter. For current behavior, check the README and CLI help for the rubyfmt version you have installed.
Quick Recap
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