brittany

Format file and output to stdout

$ brittany [source.hs]

$ cat [source.hs] | brittany

$ brittany --write-mode=inplace [*.hs]

$ brittany --check-mode [source.hs]

$ brittany --config-file [brittany.yaml] [source.hs]

$ brittany --columns [100] [source.hs]

brittany [options] [files]

brittany is a Haskell source code formatter that focuses on horizontal space utilization. It reformats code to make maximal use of available width while avoiding lines that are too long.
The formatter uses ghc-exactprint as the parser, supporting full GHC Haskell including extensions.

--write-mode mode

Output mode: stdout, inplace, or display

Exit with error if formatting would change

Maximum line width (default: 80)

Indentation width (default: 2)

Use specific configuration file

Ignore user configuration file

Default user config: ~/.config/brittany/config.yaml
Project config: First brittany.yaml found in current or parent directories.
GHC extensions can be enabled in config:

$ conf_forward:
  options_ghc:
    - -XLambdaCase
    - -XMultiWayIf

Some less common Haskell syntax elements are not fully supported. In-source comments may occasionally be moved or lost. This project is effectively unmaintained; consider using Ormolu or Fourmolu instead.

ormolu(1), fourmolu(1), stylish-haskell(1), ghc(1)