cfn-format を Homebrew でインストール

プロジェクトリンク

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コマンドとエイリアス

• cfn-format

プロジェクトの歴史

The upstream rain repository was created in 2019 and describes rain as a development workflow tool for AWS CloudFormation templates and stacks. Its README lists consistent formatting of CloudFormation templates as a key feature of `rain fmt`, including JSON/YAML conversion and YAML comment preservation.

採用の歴史

Homebrew packages `cfn-format` separately from rain, building the `./cmd/cfn-format` target from the rain source repository. This gives package users a narrower formatter binary without installing the broader rain workflow CLI name.

使われ方

The Homebrew formula test runs `cfn-format -v test.template` and expects a formatted-ok message. The rain README documents the broader formatter behavior under `rain fmt`.

パッケージ好きにとっての重要性

cfn-format is package-nerd-interesting because it exposes one subcommand-sized slice of a larger CloudFormation workflow tool as its own formula, the kind of tiny binary split that helps scripts depend on exactly the formatter they need.

タイムライン

• 2019: rain GitHub repository metadata records public repository creation.
• 2019: GitHub release metadata records rain v0.1.0.
• 2026: Homebrew formula builds cfn-format from rain v1.24.4.

Related projects

• rain is the upstream project and broader CloudFormation workflow CLI.
• cfn-flip is the older AWS Labs converter whose CLI usage now points users to `rain fmt`.

ソース

• https://api.github.com/repos/aws-cloudformation/rain
• https://github.com/aws-cloudformation/rain
• https://aws-cloudformation.github.io/rain/rain_fmt.html
• https://github.com/aws-cloudformation/rain#readme
• https://formulae.brew.sh/api/formula/cfn-format.json