Fourmolu formatting in CI (#13)

* Started formatting work

* Some fourmolu options

* Add fourmolu to CI

* Remove stray file

Author: MaximilianAlgehed

.github/workflows/ci.yaml

@@ -53,6 +53,10 @@ jobs:
       run: |
         nix-shell --arg withoutDevTools true --run 'cabal test all --test-options "--xml=test-results.xml"'
 
+    - name: Formatting
+      run: |
+        nix-shell --arg withoutDevTools false --run './fmt.sh check'
+
     - name: Upload build & test artifacts
       uses: actions/upload-artifact@v2
       with:

fmt.sh

@@ -1,2 +1,4 @@
 #!/bin/bash
-find . -type f -name *.hs | xargs -n1 fourmolu -i
+MODE=${1:-inplace}
+fourmolu -m $MODE -c $(find quickcheck-dynamic* -type f -name *.hs)
+exit $?

fourmolu.yaml

@@ -1,8 +1,10 @@
 indentation: 2
 comma-style: leading # for lists, tuples etc. - can also be 'trailing'
+function-arrows: leading
 record-brace-space: false # rec {x = 1} vs. rec{x = 1}
 indent-wheres: false # 'false' means save space by only half-indenting the 'where' keyword
 diff-friendly-import-export: true # 'false' uses Ormolu-style lists
 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
+-o: -XImportQualifiedPost