fourmolu.yaml

indentation: 2
comma-style: leading # for lists, tuples etc. - can also be 'trailing'
record-brace-space: false # rec {x = 1} vs. rec{x = 1}
indent-wheres: true # 'false' means save space by only half-indenting the 'where' keyword
import-export-style: diff-friendly
respectful: true # don't be too opinionated about newlines etc.
haddock-style: single-line # '--' vs. '{-'
newlines-between-decls: 1 # number of newlines between top-level declarations
single-constraint-parens: auto
let-style: inline

# The fixity of operators affects how Fourmolu formats them.
# Without this directive, we'd get really wonky corrections that would do things like turn this:
# ```
# exprA && exprB
# ```
# Into
# ```
# expr
#  && exprB
# ``
# For operator heavy code, like Aeson parsers, it would be even worse than this.
# Fourmolu says that it can automatically detect fixities in most cases,
# but I had to specify these manually to get reasonable formatting.
# Docs: https://github.com/fourmolu/fourmolu#language-extensions-dependencies-and-fixities
# If you have issues with operator formatting, usually you can find the right fixity in the haddocks.
fixities:
- infixr 0 $
- infixr 2 ||
- infixl 3 <|>
- infixr 3 &&
- infix 4 ==
- infixl 4 <$>, <*>
- infixr 6 <>