feat: add version command

packages/command/bin/flutter_gen_command.dart

@@ -3,14 +3,15 @@ import 'dart:io';
 import 'package:args/args.dart';
 import 'package:flutter_gen_core/flutter_generator.dart';
 import 'package:flutter_gen_core/utils/cast.dart';
+import 'package:flutter_gen_core/utils/version.dart';
 
 void main(List<String> args) {
   final parser = ArgParser();
   parser.addOption(
     'config',
     abbr: 'c',
-    defaultsTo: 'pubspec.yaml',
     help: 'Set the path of pubspec.yaml.',
+    defaultsTo: 'pubspec.yaml',
   );
 
   parser.addFlag(
@@ -20,12 +21,21 @@ void main(List<String> args) {
     defaultsTo: false,
   );
 
+  parser.addFlag(
+    'version',
+    abbr: 'v',
+    help: 'FlutterGen version',
+    defaultsTo: false,
+  );
+
   ArgResults results;
   try {
     results = parser.parse(args);
     if (results.wasParsed('help')) {
-      // ignore: avoid_print
-      print(parser.usage);
+      stdout.writeln(parser.usage);
+      return;
+    } else if (results.wasParsed('version')) {
+      stdout.writeln(flutterGenVersion);
       return;
     }
   } on FormatException catch (e) {

packages/core/lib/flutter_generator.dart

@@ -1,8 +1,7 @@
-// ignore_for_file: avoid_print
-
 import 'dart:io';
 
 import 'package:dart_style/dart_style.dart';
+import 'package:flutter_gen_core/utils/version.dart';
 import 'package:path/path.dart';
 
 import 'generators/assets_generator.dart';
@@ -26,6 +25,7 @@ class FlutterGenerator {
   final String fontsName;
 
   Future<void> build() async {
+    stdout.writeln(flutterGenVersion);
     Config config;
     try {
       config = await loadPubspecConfig(pubspecFile);
@@ -55,7 +55,7 @@ class FlutterGenerator {
       final colors =
           File(normalize(join(pubspecFile.parent.path, output, colorsName)));
       writeAsString(generated, file: colors);
-      print('Generated: ${colors.absolute.path}');
+      stdout.writeln('Generated: ${colors.absolute.path}');
     }
 
     if (flutterGen.assets.enabled && flutter.assets.isNotEmpty) {
@@ -66,17 +66,17 @@ class FlutterGenerator {
       final assets =
           File(normalize(join(pubspecFile.parent.path, output, assetsName)));
       writeAsString(generated, file: assets);
-      print('Generated: ${assets.absolute.path}');
+      stdout.writeln('Generated: ${assets.absolute.path}');
     }
 
     if (flutterGen.fonts.enabled && flutter.fonts.isNotEmpty) {
       final generated = generateFonts(formatter, flutter.fonts);
       final fonts =
           File(normalize(join(pubspecFile.parent.path, output, fontsName)));
       writeAsString(generated, file: fonts);
-      print('Generated: ${fonts.absolute.path}');
+      stdout.writeln('Generated: ${fonts.absolute.path}');
     }
 
-    print('FlutterGen finished.');
+    stdout.writeln('FlutterGen finished.');
   }
 }

packages/core/lib/settings/config.dart

@@ -13,8 +13,7 @@ class Config {
 }
 
 Future<Config> loadPubspecConfig(File pubspecFile) async {
-  // ignore: avoid_print
-  print('FlutterGen Loading ... '
+  stdout.writeln('FlutterGen Loading ... '
       '${normalize(join(
     basename(pubspecFile.parent.path),
     basename(pubspecFile.path),

packages/core/lib/utils/version.dart

@@ -0,0 +1,3 @@
+import 'package:flutter_gen_core/version.gen.dart';
+
+String flutterGenVersion = 'FlutterGen v$packageVersion';

packages/core/lib/version.gen.dart

@@ -0,0 +1,2 @@
+/// DO NOT MODIFY BY HAND, Generated by version_gen
+String packageVersion = '4.0.1';

packages/core/pubspec.lock

@@ -491,6 +491,13 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "1.3.0"
+  version_gen:
+    dependency: "direct dev"
+    description:
+      name: version_gen
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "1.0.1"
   vm_service:
     dependency: transitive
     description:

packages/core/pubspec.yaml

@@ -10,6 +10,9 @@ issue_tracker: https://github.com/FlutterGen/flutter_gen/issues
 environment:
   sdk: '>=2.12.0 <3.0.0'
 
+version_gen:
+  path: lib/
+
 dependencies:
   path: '>=1.8.0 <2.0.0'
   yaml: '>=3.0.0 <4.0.0'
@@ -31,3 +34,4 @@ dev_dependencies:
   flutter_lints: '>=1.0.4 <2.0.0'
   build_runner: '>=2.0.0 <3.0.0'
   json_serializable: '>=5.0.0 <6.0.0'
+  version_gen: '>=1.0.1 <2.0.0'