Create dart-progress-for-futuret.dart

source/dart-progress-for-futuret.dart

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+// Want to support my work 🤝? https://buymeacoffee.com/vandad
+
+import 'dart:io' show stdout;
+import 'dart:async' show Future, Stream;
+
+const loadingSequence = ['⢿', '⣻', '⣽', '⣾', '⣷', '⣯', '⣟', '⡿'];
+const escape = '\x1B[38;5;';
+const color = '${escape}1m';
+const textColor = '${escape}6m';
+
+String progress({required int value, required String text}) {
+  final progress = '$color${loadingSequence[value % loadingSequence.length]}';
+  final coloredText = '$textColor$text';
+  return '$progress\t$coloredText';
+}
+
+Future<T> performWithProgress<T>({
+  required Future<T> task,
+  required String progressText,
+}) {
+  final stream = Stream<String>.periodic(
+    Duration(milliseconds: 100),
+    (value) => progress(
+      value: value,
+      text: progressText,
+    ),
+  );
+
+  final subscription = stream.listen(
+    (event) {
+      stdout.write('\r $event');
+    },
+  );
+
+  task.whenComplete(() {
+    stdout.write('\r ✅\t$progressText');
+    stdout.write('\n');
+    subscription.cancel();
+  });
+
+  return task;
+}
+
+final task1 = Future.delayed(Duration(seconds: 1), () => 'Result 1');
+final task2 = Future.delayed(Duration(seconds: 2), () => 'Result 2');
+final task3 = Future.delayed(Duration(seconds: 3), () => 'Result 3');
+
+void main(List<String> args) async {
+  var result = await performWithProgress(
+    task: task1,
+    progressText: 'Loading task 1',
+  );
+  print('\tTask 1 result: $result');
+  result = await performWithProgress(
+    task: task2,
+    progressText: 'Loading task 2',
+  );
+  print('\tTask 2 result: $result');
+  result = await performWithProgress(
+    task: task3,
+    progressText: 'Loading task 3',
+  );
+  print('\tTask 3 result: $result');
+}