fourmolu-nix options
The following options can be set in a flake-parts configuration.
If you want to use lib, you don't need fourmolu. part of options.
{
settings = {
indentaion = 4;
};
}
fourmolu.package
fourmolu derivation to use.
Type: package
Default:
pkgs.haskellPackages.fourmolu
fourmolu.devShell
A development shell with fourmolu installed.
Type: package (read only)
fourmolu.settings
fourmolu configuration
Type: submodule
Default:
{ }
fourmolu.settings.column-limit
Max line length for automatic line breaking
Type: value “none” (singular enum) or (positive integer, meaning >0)
Default:
"none"
Example:
80
fourmolu.settings.comma-style
How to place commas in multi-line lists, records, etc.
Type: one of “trailing”, “leading”
Default:
"leading"
fourmolu.settings.extensions
List of ghc extensions to pass to fourmolu
Type: list of string
Default:
[ ]
fourmolu.settings.function-arrows
Styling of arrows in type signatures
Type: one of “trailing”, “leading”, “leading-args”
Default:
"trailing"
Example:
"leading"
fourmolu.settings.haddock-style
How to print Haddock comments
Type: one of “single-line”, “multi-line”, “multi-line-compact”
Default:
"multi-line"
fourmolu.settings.haddock-style-module
How to print module docstring
Type: one of “single-line”, “multi-line”, “multi-line-compact”
Default:
"multi-line"
fourmolu.settings.import-export-style
Styling of import/export lists
Type: one of “trailing”, “leading”, “diff-friendly”
Default:
"diff-friendly"
Example:
"leading"
fourmolu.settings.in-style
How to align the ‘in’ keyword with respect to the ‘let’ keyword
Type: one of “right-align”, “left-align”, “no-space”
Default:
"right-align"
fourmolu.settings.indent-wheres
Whether to full-indent or half-indent ‘where’ bindings past the preceding body
Type: boolean
Default:
false
fourmolu.settings.indentation
Number of spaces per indentation step
Type: positive integer, meaning >0
Default:
2
Example:
4
fourmolu.settings.let-style
Styling of let blocks
Type: one of “auto”, “inline”, “newline”, “mixed”
Default:
"auto"
fourmolu.settings.newlines-between-decls
Number of spaces between top-level declarations
Type: positive integer, meaning >0
Default:
1
fourmolu.settings.options
Fourmolu options to pass to wrapped fourmolu
Type: list of string
Default:
[ ]
fourmolu.settings.record-brace-space
Whether to leave a space before an opening record brace
Type: boolean
Default:
false
fourmolu.settings.respectful
Give the programmer more choice on where to insert blank lines
Type: boolean
Default:
true
fourmolu.settings.single-constraint-parens
Whether to put parentheses around a single constraint
Type: one of “auto”, “always”, “never”
Default:
"always"
fourmolu.settings.unicode
Output Unicode syntax
Type: one of “detect”, “always”, “never”
Default:
"never"
fourmolu.wrapper
The fourmolu package, wrapped with the settings as arguments.
Type: package (read only)
Default:
wrapped fourmolu command