Recursive folder copy in Dart: An updated Dart web_ui build script which recursively copies a folder and its contents to another location. Useful when building for a defined vhost (e.g. Apache with PHP back end for your Dart app) and don't want the build script to relativize your paths to go "one folder up" back from /out into /web to get CSS an…

build.dart

import 'dart:io';
import 'package:web_ui/component_build.dart';

// Ref: http://www.dartlang.org/articles/dart-web-components/tools.html
main() {
  build(new Options().arguments, ['web/index.html']);
  //recursiveFolderCopySync('web/assets', 'web/out/assets');
}

bool isSymlink(String pathString) {
  var path = new Path(pathString);

  var parentPath = path.directoryPath;
  var fullParentPath = new File.fromPath(parentPath).fullPathSync();
  var expectedPath = new Path(fullParentPath).append(path.filename).toString();

  var fullPath = new File.fromPath(path).fullPathSync();

  return fullPath != expectedPath;
}

void recursiveFolderCopySync(String path1, String path2) {
  Directory dir1 = new Directory(path1);
  if (!dir1.existsSync()) {
    throw new Exception(
        'Source directory "${dir1.path}" does not exist, nothing to copy'
    );
  }
  Directory dir2 = new Directory(path2);
  if (!dir2.existsSync()) {
    dir2.createSync(recursive: true);
  }
  
  dir1.listSync().forEach((element) {
    if (!isSymlink(element.path)) {
      Path elementPath = new Path(element.path);
      String newPath = "${dir2.path}/${elementPath.filename}";
      if (element is File) {
        File newFile = new File(newPath);
        newFile.writeAsBytesSync(element.readAsBytesSync());
      } else if (element is Directory) {
        recursiveFolderCopySync(element.path, newPath);
      } else {
        throw new Exception('File is neither File nor Directory. HOW?!');
      }
    }
  });
  
}