fourmolu.yaml

# This is a YAML file specifying a custom configuration for Fourmolu.

version: 0.1

steps: # Customize how each formatting step is run
  - type: AggressiveSpaceRemoval # Remove redundant white space
  - type: Parens # Add parentheses to some expressions
    options:
      application: True # Add parentheses to function application
  - type: Lines # Split long lines
    options:
      lineLength: 80 # Limit line length to 80 characters
      trailingWhitespace: Preserve # Preserve trailing white space
  - type: GroupImports # Sort and group import statements
    options:
      modules:
        - "Data.*"
        - "Control.*"
        - "System.*"
        - "Prelude"
        - "MyModule.*" # Group your own module's imports last

options: # Customize overall formatting options
  maxColumns: 80 # Limit line length to 80 characters
  indent: 2 # Use two spaces for indentation
  trailingWhitespace: Preserve # Preserve trailing white space
  eol: LF # Use LF line endings
  padModuleImports: True # Add padding to import statements
  noSortImports: False # Sort import statements
  singleLinePerTypeSynonym: False # Allow type synonyms on a single line