Set up fourmolu as the formatter for 'troupec' (Haskell code)

Author: ssoelvsten

.github/workflows/fourmolu.yml

@@ -0,0 +1,21 @@
+name: fourmolu
+
+on:
+  push:
+    branches: [ master, dev ]
+    paths: [ '**.hs' ]
+  pull_request_target:
+    branches: [ master, dev ]
+    paths: [ '**.hs' ]
+
+jobs:
+  format:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v5
+
+      - uses: haskell-actions/run-fourmolu@v9
+        with:
+          version: "0.17.0.0"
+          follow-symbolic-links: false
+          working-directory: "./compiler"

compiler/Makefile

@@ -11,6 +11,13 @@ clean:
 	rm -rf ../bin
 # If problems still persist after this, remove all GHC compilers in ~/.stack/programs/**/
 
+# https://github.com/fourmolu/fourmolu
+format:
+	fourmolu -i *.hs */*.hs
+
+format/check:
+	fourmolu --mode check *.hs */*.hs
+
 ghci-irtester:
 	stack ghci --main-is Troupe-compiler:exe:irtester --no-load
 

compiler/README.md

@@ -1 +1,5 @@
-# PicoML-compiler
+# TroupeC: Troupe Compiler
+
+## Formatting
+
+The Haskell code is formatted with [`fourmolu`](https://github.com/fourmolu/fourmolu).

compiler/fourmolu.yaml

@@ -0,0 +1,75 @@
+# Number of spaces per indentation step
+indentation: 4
+
+# 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
+
+# Rules for grouping import declarations
+import-grouping: legacy
+
+# 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: multi-line
+
+# How to print module docstring
+haddock-style-module: null
+
+# Styling of let blocks (choices: auto, inline, newline, or mixed)
+let-style: inline
+
+# 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 keywords then and else should be indented or hanging off the current indentation.
+if-style: hanging
+
+# Whether to put parentheses around a single constraint (choices: auto, always, or never)
+single-constraint-parens: always
+
+# Whether to put parentheses around a single deriving class (choices: auto, always, or never)
+single-deriving-parens: always
+
+# Whether to sort constraints
+sort-constraints: true
+
+# Whether to sort derived classes
+sort-derived-classes: true
+
+# Whether to sort deriving clauses
+sort-deriving-clauses: true
+
+# Whether to place section operators (those that are infixr 0, such as $) in trailing position, continuing the expression indented below
+trailing-section-operators: true
+
+# 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
+fixities: []
+
+# Module reexports Fourmolu should know about
+reexports: []
+
+# Modules defined by the current Cabal package for import grouping
+local-modules: []
+