efmt

An Erlang code formatter.

Features

• Opinionated: only maximum line length is configurable by users
• Emacs Erlang Mode friendly indentation
• Preserves non-whitespace tokens of the original text as-is
  • Ensures the code after formatting keeps the same semantic meaning
• Provides a rebar3 plugin: rebar3_efmt
• Thorough macro support (MACROANDPREPROCESS.md)

An Formatting Example

Before

```erlang -module(example). -export( [fac/1] ).

fac(1) -> 1; fac(N) -> N*fac(N-1). ```

After

```erlang -module(example). -export([fac/1]).

fac(1) -> 1; fac(N) -> N * fac(N - 1). ```

Please refer to FORMAT_RULES.md about the formatting style.

Installation

Usage

Editor Integrations

TODO

Comparison with other formatters

erlfmt

• formatting style
• error handling
• macro handling
• formatting speed
• development phase

Limitations

There are some limitations that are not planned to be addressed in the future: - Only supports UTF-8 files - Doesn't process parse transforms - That is, if a parse transform has introduced custom syntaxes in your Erlang code, efmt could fail