feat(cli): add basic help information

cli/lib/main.dart

@@ -1,3 +1,39 @@
-void main(List<String> arguments) {
-  print('Hello world!');
+import 'dart:io';
+
+import 'package:args/args.dart';
+import 'package:path/path.dart' as path;
+
+Future<void> main(List<String> arguments) async {
+  final parser = ArgParser();
+
+  parser.addFlag('help', abbr: 'h', negatable: false, help: 'Prints usage information', defaultsTo: false);
+  parser.addFlag('receive', abbr: 'r', negatable: false, help: 'Start a server to receive files', defaultsTo: false);
+  parser.addFlag('send', abbr: 's', negatable: false, help: 'Setups a client to send files', defaultsTo: false);
+
+  final results = parser.parse(arguments);
+
+  if (results['help']) {
+    _printUsage(parser);
+    return;
+  }
+
+  final receive = results['receive'] as bool;
+  final send = results['send'] as bool;
+
+  if (receive) {
+    print('Starting server...');
+  } else if (send) {
+    print('Setting up client...');
+  } else {
+    _printUsage(parser);
+  }
+}
+
+void _printUsage(ArgParser parser) {
+  print('The LocalSend CLI to send and receive files locally.');
+  print('');
+  print('Usage: ${path.basename(Platform.executable)} [options]');
+  print('');
+  print('Options:');
+  print(parser.usage);
 }

cli/pubspec.lock

@@ -18,7 +18,7 @@ packages:
     source: hosted
     version: "6.2.0"
   args:
-    dependency: transitive
+    dependency: "direct main"
     description:
       name: args
       sha256: eef6c46b622e0494a36c5a12d10d77fb4e855501a91c1b9ef9339326e58f0596
@@ -164,10 +164,10 @@ packages:
     dependency: transitive
     description:
       name: meta
-      sha256: a6e590c838b18133bb482a2745ad77c5bb7715fb0451209e1a7567d416678b8e
+      sha256: "7687075e408b093f36e6bbf6c91878cc0d4cd10f409506f7bc996f68220b9136"
       url: "https://pub.dev"
     source: hosted
-    version: "1.10.0"
+    version: "1.12.0"
   mime:
     dependency: transitive
     description:
@@ -193,13 +193,13 @@ packages:
     source: hosted
     version: "2.1.0"
   path:
-    dependency: transitive
+    dependency: "direct main"
     description:
       name: path
-      sha256: "8829d8a55c13fc0e37127c29fedf290c102f4e40ae94ada574091fe0ff96c917"
+      sha256: "087ce49c3f0dc39180befefc60fdb4acd8f8620e5682fe2476afd0b3688bb4af"
       url: "https://pub.dev"
     source: hosted
-    version: "1.8.3"
+    version: "1.9.0"
   pool:
     dependency: transitive
     description:

cli/pubspec.yaml

@@ -7,8 +7,10 @@ environment:
   sdk: ^3.1.1
 
 dependencies:
+  args: 2.4.2
   common:
     path: ../common
+  path: 1.9.0
 
 dev_dependencies:
   lints: ^2.0.0