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Support for command line apps #41

@jlubeck

Description

@jlubeck

Use case

Trying to create a -v flag for my command line application, and when I import 'package:package_info_plus/package_info_plus.dart'; I'm getting these errors:

../../../flutter/packages/flutter/lib/src/services/binary_messenger.dart:7:8: Error: Not found: 'dart:ui'
import 'dart:ui' as ui;
       ^
../../../flutter/packages/flutter/lib/src/services/binding.dart:8:8: Error: Not found: 'dart:ui'
import 'dart:ui' as ui;
       ^
../../../flutter/packages/flutter/lib/src/services/font_loader.dart:7:8: Error: Not found: 'dart:ui'
import 'dart:ui';
       ^
../../../flutter/packages/flutter/lib/src/services/platform_messages.dart:7:8: Error: Not found: 'dart:ui'
import 'dart:ui' as ui;
       ^
../../../flutter/packages/flutter/lib/src/services/platform_views.dart:7:8: Error: Not found: 'dart:ui'
import 'dart:ui';
       ^
../../../flutter/packages/flutter/lib/src/services/raw_keyboard.dart:6:8: Error: Not found: 'dart:ui'
import 'dart:ui';
       ^
../../../flutter/packages/flutter/lib/src/services/system_channels.dart:6:8: Error: Not found: 'dart:ui'
import 'dart:ui';
       ^
../../../flutter/packages/flutter/lib/src/services/system_chrome.dart:7:8: Error: Not found: 'dart:ui'
import 'dart:ui';
       ^
../../../flutter/packages/flutter/lib/src/services/system_chrome.dart:13:1: Error: Not found: 'dart:ui'
export 'dart:ui' show Brightness;
^
../../../flutter/packages/flutter/lib/src/services/text_editing.dart:6:8: Error: Not found: 'dart:ui'
import 'dart:ui' show hashValues, TextAffinity, TextPosition, TextRange;
       ^

Which makes sense because command line apps don't have the dart:uilibrary

Proposal

It would be great to be able to get my pubspec version from my command line app, like I do on my other apps.

Thanks!

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