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A fork of Elixir's code formatter, with added freedom.
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.formatter.exs add message to .formatter.exs May 18, 2018

🇺🇸🇺🇸🇺🇸 Freedom Formatter 🇺🇸🇺🇸🇺🇸

A fork of Elixir's code formatter, with added freedom. Build Status Version

Freedom Formatter respects .formatter.exs and supports all features of the standard code formatter, as well as additional features unlikely to arrive soon in core Elixir.

Freedom Formatter



{:freedom_formatter, "~> 1.0", only: :dev}


mix fformat


Elixir's code formatter does not intend to support trailing commas, or indeed any additional settings, until at least January 2019. See Elixir issues #7689 and #6646 for more information.

Thanks to software freedom, we can use tomorrow's formatter today.

Project Goals

  • To provide a compatible alternative to the Elixir formatter, available separately from the core Elixir distribution
  • To allow developers and teams to benefit from standardized code formatting while retaining a style they find more productive
  • To be a testbed for new formatting features and options, maintaining the easiest possible path to possible inclusion in core Elixir.

Added features

Freedom Formatter supports all Elixir's standard code formatting options, as well as:

  • :trailing_comma - if set true, multi-line list, map, and struct literals will include a trailing comma after the last item or pair in the data structure. Does not affect argument lists, tuples, or lists/maps/structs rendered on a single line.

Authorship and License

Freedom Formatter is released under the same license as Elixir itself, the Apache License Version 2.0, included here as the file LICENSE.

Freedom Formatter is based upon the Elixir code formatter, whose implementation and tests are included in this project. The core Elixir formatter was written by José Valim, with contributions from Andrea Leopardi and others.

Customizations to the formatter are written by Pete Gamache.

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