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Short answer: The reviewed rubyfmt documentation does not publish a supported Ruby-version range, so check the requirements for the exact release before adopting it—especially on projects using an older Ruby runtime. You can manage which files it formats with ignore files, command-line options, and file headers; for VS Code, the documented current setup uses Ruby LSP and the community rubyfmt formatter add-on.

Which Ruby versions does rubyfmt support?

The official rubyfmt README does not state a minimum supported Ruby version or provide a Ruby compatibility matrix. That absence is not proof that every Ruby version works. rubyfmt is written in Rust, but it parses and formats Ruby source; the formatter’s implementation language does not establish which Ruby syntax or runtime versions a particular release supports.

Before adding it to a project, check the requirements and compatibility notes for the exact rubyfmt release you plan to install. This is particularly important if the project is tied to an older Ruby runtime. Do not apply requirements published for a differently named tool such as rfmt; it is a separate project.

How do I install rubyfmt?

Homebrew

The project README’s quick-start command is:

brew install rubyfmt

Homebrew listed stable version 0.14.1 on October 4, 2026, with bottles for Apple Silicon on macOS Tahoe, Sequoia, and Sonoma; Intel macOS Sonoma; and Linux ARM64 and x86_64. These are Homebrew’s package and platform details as of that date, not a statement about supported Ruby versions. Check the Homebrew rubyfmt formula for current package information.

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Build from source

The project README also documents building with Cargo. After building, put target/release/rubyfmt-main on your PATH under the name rubyfmt, so commands and editor integrations can find the executable.

How do I control which files rubyfmt formats?

rubyfmt documents file-selection controls rather than a general style-configuration file. They let a team choose where formatting runs without implying that options such as line length, quote style, or indent width are configurable.

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  • .rubyfmtignore at the project root excludes paths using .gitignore-style syntax.
  • By default, rubyfmt respects .gitignore. Use --include-gitignored to include ignored files.
  • --header-opt-in limits formatting to files that begin with # rubyfmt: true.
  • --header-opt-out skips files that begin with # rubyfmt: false.

The command-line interface supports these common operations:

Task Command Result
Print formatted output rubyfmt file.rb Writes the formatted content to standard output.
Format in place rubyfmt -i file.rb Changes the file directly.
Show a diff rubyfmt -c file.rb Outputs a diff rather than simply replacing the file.
Format standard input cat file.rb | rubyfmt Reads Ruby source from the pipe and formats it.
Format multiple files rubyfmt path/to/directory The README says directories can be passed to format multiple files.

How do I set up rubyfmt in VS Code?

The project’s current documented route is Ruby LSP with the ruby-lsp-rubyfmt-formatter add-on. Ruby LSP lists rubyfmt as a formatter supplied by a community add-on, so the setup requires both the Ruby LSP extension and the add-on.

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  1. Install the Ruby LSP extension in VS Code.
  2. Add the formatter add-on to your project development group with bundle add ruby-lsp-rubyfmt-formatter --group development, or install it globally with gem install ruby-lsp-rubyfmt-formatter.
  3. Set Ruby LSP as the default formatter for Ruby and enable format-on-save. In VS Code settings, set rubyLsp.formatter to rubyfmt.

The available formatter setting is also listed in the Ruby LSP VS Code extension settings. The rubyfmt README includes a path using the older Ruby VS Code extension, but marks that extension deprecated; it should be treated as a legacy option, not the recommended starting point. The README also lists Formatto as another route.

Which other editors have documented integrations?

Editor Documented integration Notes
Neovim null-ls formatting source null_ls.builtins.formatting.rubyfmt Uses the null-ls integration documented by the project.
Vim Install the repository’s Vim plug-in through vim-plug or native packages. Set g:rubyfmt_path if the executable is not on PATH.
RubyMine and other JetBrains IDEs Install File Watchers and import the project’s watchers.xml. The README says the watcher can optionally be made global.
Sublime Text Install the Rubyfmt plug-in through Package Control. The plug-in documents executable settings and format-on-save enabled by default. It cannot format files with syntax errors.
Atom Install the rubyfmt package from Settings > Packages. The README documents format-on-save and a keyboard shortcut.

These integrations are documented routes, not guarantees of compatibility with every editor release. If an editor does not format, confirm that it can find the rubyfmt executable on its PATH and check whether its plug-in is still maintained. The Sublime Text Package Control listing says the Rubyfmt plug-in was last modified six years ago.

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What does the project say about maintenance?

The project README says its original author is no longer working on open source in their spare time and that other contributors work regularly on rubyfmt; it also welcomes contributors with commit access who merge changes that pass CI. That statement describes the project’s maintenance context, but does not promise a support period or predictable release cadence.

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