Fantomas vs gofmt

Fantomas formats F# source code according to configuration, using default rules based on Microsoft’s F# style guide. Settings are also available for G-Research conventions. It runs as a .NET tool, and local installation is recommended when a repository needs to keep a fixed version. The command line accepts folders or files with `.fs`, `.fsi`, `.fsx`, `.ml` or `.mli` extensions; source files are expected to parse with the F# compiler before formatting. A limited selection of options can be placed in `.editorconfig` for automatic use by the command-line tool. For continuous integration checks, `dotnet fantomas check` reports formatting drift and exits with a failure code when files need formatting. Setup guides are available for JetBrains Rider, Visual Studio Code and Visual Studio, and the official site links to an online tool for trying the formatter and its settings. Fantomas and its library are available under the Apache 2.0 license. The project is described as an fsprojects incubation project. It is free and open source, with web access listed alongside Linux, macOS and Windows.

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.