fourmolu.yaml

# The MIT License (MIT)

# Copyright (c) 2016-2025 Objectionary.com

# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:

# The above copyright notice and this permission notice shall be included
# in all copies or substantial portions of the Software.

# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
# SOFTWARE.
# Number of spaces per indentation step
indentation: 2

# Max line length for automatic line breaking
column-limit: none

# Styling of arrows in type signatures (choices: trailing, leading, or leading-args)
function-arrows: trailing

# How to place commas in multi-line lists, records, etc. (choices: leading or trailing)
comma-style: leading

# Styling of import/export lists (choices: leading, trailing, or diff-friendly)
import-export-style: diff-friendly

# Whether to full-indent or half-indent 'where' bindings past the preceding body
indent-wheres: false

# Whether to leave a space before an opening record brace
record-brace-space: false

# Number of spaces between top-level declarations
newlines-between-decls: 1

# How to print Haddock comments (choices: single-line, multi-line, or multi-line-compact)
haddock-style: single-line

# How to print module docstring
haddock-style-module: null

# Styling of let blocks (choices: auto, inline, newline, or mixed)
let-style: auto

# How to align the 'in' keyword with respect to the 'let' keyword (choices: left-align, right-align, or no-space)
in-style: right-align

# Whether to put parentheses around a single constraint (choices: auto, always, or never)
single-constraint-parens: always

# Output Unicode syntax (choices: detect, always, or never)
unicode: never

# Give the programmer more choice on where to insert blank lines
respectful: true

# Fixity information for operators
# listed explicitly to ensure consistent formatting
# between HLS and standalone versions of fourmolu
# https://github.com/haskell/haskell-language-server/issues/3882
fixities:
  - infixr 9  .
  - infixr 5  ++
  - infixl 4  <$
  - infixl 1  >>, >>=
  - infixr 1  =<<
  - infixr 0  $, $!
  - infixl 4 <*>, <*, *>, <**>

# Module reexports Fourmolu should know about
reexports: []