dart fix --dry-run での確認フローを追加

scripts/check-format-ci.sh

@@ -1,8 +1,42 @@
 #!/usr/bin/env bash
 
+# for terminate any remaining background jobs when the script exits.
+trap '[ 0 -lt $(jobs | wc -l) ] && kill -SIGKILL $(jobs -p)' EXIT
+
+# wait for all child processes to finish and returns a non-zero status if any of them fail.
+wait_for_all(){
+  for pid in $@; do
+    wait ${pid} || return 1
+  done
+}
+
+find_files() {
+  find . -name "*.dart" -not \( -name "*.freezed.dart" -o -name "*.g.dart" -o -name "*.gen.dart" -o -path "*/gen/*.dart" -o -path "./.dart_tool/*" \) -print0
+}
+
 files=()
 while IFS= read -r -d $'\0' file; do
-    files+=("$file")
-done < <(find . -name "*.dart" -not \( -name "*.freezed.dart" -o -name "*.g.dart" -o -name "*.gen.dart" -o -path "*/gen/*.dart" -o -path "./.dart_tool/*" \) -print0)
+  files+=("$file")
+done < <(find_files)
+
+PIDS=()
+for file in "${files[@]}"; do
+  # limit jobs to 5
+  if [ "$(jobs -r | wc -l)" -ge 5 ]; then
+      wait "$(jobs -r -p | head -1)"
+  fi
+
+  (
+    # Note: The script relies on the 'Nothing to fix!' output from 'dart fix --dry-run'.
+    # This dependency might be an issue if the output format changes in future Dart versions.
+    if ! dart fix --dry-run "$file" | grep -q "Nothing to fix!"; then
+      echo "Fixes might be needed for $file"
+      exit 1
+    fi
+  ) &
+  PIDS+=($!)
+done
 
 dart format -o none --set-exit-if-changed "${files[@]}"
+
+wait_for_all ${PIDS[@]}