validatePath method

String? validatePath(String? path)

Normalizes a file system path so it can be safely consumed by dart:io.

• Returns null when path is null or empty.
• Prepends a leading / on non-Windows platforms when missing.
• Removes a single trailing separator (/ or \\).
• Collapses repeated separators into a single platform-specific one.

Implementation

String? validatePath(String? path) {
  if (path == null || path.isEmpty) return null;

  String normalized = path;
  if (!Platform.isWindows && !normalized.startsWith('/')) {
    normalized = '/$normalized';
  }

  if (normalized.endsWith('/') || normalized.endsWith(r'\')) {
    normalized = normalized.substring(0, normalized.length - 1);
  }

  return normalized.replaceAll(RegExp(r'[/\\]+'), pathJoin);
}