Roll custom random string for Dart 2

lib/src/commands/init.dart

@@ -4,7 +4,7 @@ import "package:args/command_runner.dart";
 import 'package:io/ansi.dart';
 import 'package:path/path.dart' as p;
 import 'package:prompts/prompts.dart' as prompts;
-import 'package:random_string/random_string.dart' as rs;
+import '../random_string.dart' as rs;
 import '../util.dart';
 import 'key.dart';
 import 'pub.dart';

lib/src/commands/key.dart

@@ -1,6 +1,6 @@
 import 'dart:io';
 import 'package:args/command_runner.dart';
-import 'package:random_string/random_string.dart' as rs;
+import '../random_string.dart' as rs;
 
 class KeyCommand extends Command {
   @override

lib/src/random_string.dart

@@ -0,0 +1,15 @@
+import 'dart:math';
+
+const String _valid =
+    'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789';
+final Random _rnd = new Random.secure();
+
+String randomAlphaNumeric(int length) {
+  var b = new StringBuffer();
+
+  for (int i = 0; i < length; i++) {
+    b.writeCharCode(_valid.codeUnitAt(_rnd.nextInt(_valid.length)));
+  }
+
+  return b.toString();
+}

pubspec.yaml

@@ -4,7 +4,7 @@ homepage: https://github.com/angel-dart/angel_cli
 name: angel_cli
 version: 1.3.0
 dependencies: 
-  # analyzer: ^0.29.0
+  analyzer: ">=0.32.0"
   args: ^1.0.0
   code_builder: ^3.0.0
   dart_style: ^1.0.0
@@ -18,7 +18,7 @@ dependencies:
   path: ^1.0.0
   prompts: ^1.0.0
   pubspec_parse: ^0.1.2
-  random_string: ^0.0.1
+  quiver: ">=0.29.0"
   recase: ^1.0.0
   watcher: ^0.9.7
   yaml: ^2.0.0