gofmt vs Spotless

gofmt is the Go source formatter distributed with Go installations, available on Linux, macOS, and Windows. It formats Go programs using tabs for indentation and spaces for alignment. With no path, it reads standard input; given a directory, it processes .go files recursively while skipping files whose names begin with a period. By default, reformatted source is written to standard output. Flags can show differences, list files that need formatting, apply rewrite rules, simplify code, or report all errors. The rewrite option uses patterns and replacements written as valid Go expressions. gofmt can also arrange documentation comments into canonical paragraphs, lists, headings, links, and code blocks. The Go project documents integrations for Vim, Emacs, Eclipse, and Sublime Text, plus Git pre-commit hooks and Mercurial. Since Go 1.18, it reads and formats files concurrently, with memory use limited in proportion to GOMAXPROCS. The executable is equivalent to go fmt. It is free, included in the Go installation, and distributed under a BSD-style license.

Spotless formats source code and can check files for formatting violations or apply fixes. It supports languages and formats including Java, Kotlin, JavaScript, Python, SQL, YAML, and Markdown, with formatter options such as Google Java Format, ktlint, Prettier, ESLint, Black, and ScalaFmt. The project integrates with Gradle and Maven and links to an external SBT integration. Its README links to VS Code and IntelliJ integrations. Spotless lists automatic idempotency and encoding safeguards for Gradle, Maven, and SBT. Git-based features include ratcheting from a Git reference for Gradle and Maven, and Git-defined line endings for all three build tools. Some capabilities, including ratcheting and fast incremental formatting, are unavailable in SBT. The repository identifies the license as Apache-2.0. Spotless is available for Linux, macOS, and Windows. DiffPlug directs questions to its forum and lists a technical support contact; security disclosures can be sent to [email protected]. Its plan listing includes a free plan at free, billed free forever with no registration required, and also lists a free trial.