mergeHookInstructions function

String? mergeHookInstructions(String? userInstructions, String? hookInstructions)

Merge user-supplied custom instructions with hook-provided instructions.

User instructions come first; hook instructions are appended. Empty strings normalize to null.

Implementation

String? mergeHookInstructions(
  String? userInstructions,
  String? hookInstructions,
) {
  final user = (userInstructions?.isNotEmpty ?? false) ? userInstructions : null;
  final hook = (hookInstructions?.isNotEmpty ?? false) ? hookInstructions : null;

  if (hook == null) return user;
  if (user == null) return hook;
  return '$user\n\n$hook';
}