improve output, make it pub global activatable

pkgs/puppy/bin/for_all_package_dirs.dart

@@ -1,37 +1,42 @@
-#!/usr/bin/env dart
+// Copyright (c) 2025, the Dart project authors. Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
 
 import 'dart:io';
 
+import 'package:io/ansi.dart';
+import 'package:io/io.dart';
+
 Future<void> main(List<String> args) async {
   if (args.isEmpty) {
     print('Need something to execute!');
-    exitCode = 1;
+    exitCode = ExitCode.usage.code;
     return;
   }
 
   final exe = args.first;
   final extraArgs = args.skip(1).toList();
 
-  Future<void> inspectDirectory(
-    Directory dir,
-  ) async {
+  final exits = <String, int>{};
+
+  Future<void> inspectDirectory(Directory dir) async {
     final pubspecs = dir
         .listSync()
         .whereType<File>()
         .where((element) => element.uri.pathSegments.last == 'pubspec.yaml')
         .toList();
 
     if (pubspecs.isNotEmpty) {
-      print(dir.path);
+      print(green.wrap(dir.path));
       final proc = await Process.start(
         exe,
         extraArgs,
         mode: ProcessStartMode.inheritStdio,
         workingDirectory: dir.path,
-        runInShell: true,
       );
 
-      await proc.exitCode;
+      // TODO(kevmoo): display a summary of results on completion
+      exits[dir.path] = await proc.exitCode;
     }
 
     for (var subDir in dir.listSync().whereType<Directory>().where((element) =>

pkgs/puppy/pubspec.yaml

@@ -4,5 +4,11 @@ publish_to: none
 environment:
   sdk: ^3.6.0
 
+dependencies:
+  io: ^1.0.5
+
 dev_dependencies:
   dart_flutter_team_lints: ^3.0.0
+
+executables:
+  for_all_package_dirs: