Fix error propagation in format-cabal.sh

scripts/format-cabal.sh

@@ -18,6 +18,6 @@ fi
 # Check Cabal files with cabal-fmt
 echo "Formatting Cabal source files with cabal-fmt version ${cabal_fmt_required_version}"
 # shellcheck disable=SC2016
-if ! git ls-files --exclude-standard --no-deleted --deduplicate '*.cabal' | xargs -L 1 sh -c 'echo "$0" && cabal-fmt -i "$0"'; then
+if ! git ls-files --exclude-standard --no-deleted --deduplicate '*.cabal' | xargs -L 1 sh -c 'echo "$0" && cabal-fmt -c "$0" 2>/dev/null || (cabal-fmt -i "$0" && exit 1)'; then
     exit 1
 fi

scripts/pre-commit.sh

@@ -22,6 +22,6 @@ if [ ! "${unstaged_cabal_files}" = "" ]; then
 fi
 
 # Run various checks and formatters
-./scripts/check-cabal.sh
-./scripts/format-cabal.sh
-./scripts/format-stylish.sh
+./scripts/check-cabal.sh || exit 1
+./scripts/format-cabal.sh || exit 1
+./scripts/format-stylish.sh || exit 1