caught exception when parsing arguments.

bin/nostr_console.dart

@@ -6,6 +6,10 @@ import 'package:args/args.dart';
 import 'package:crypto/crypto.dart';
 import 'dart:convert'; // for the utf8.encode method
 
+// name of executable
+String exename = "nostr_console";
+String version = "0.0.1";
+
 // well known disposable test private key
 const String testPrivateKey = "9d00d99c8dfad84534d3b395280ca3b3e81be5361d69dc0abf8e0fdf5a9d52f9";
 const String testPublicKey  = "e8caa2028a7090ffa85f1afee67451b309ba2f9dee655ec8f7e0a02c29388180";
@@ -24,7 +28,9 @@ const String helpArg     = "help";
 int numLastDays = 1; 
 
 void printUsage() {
-String usage = """usage: dartcl [OPTIONS] 
+String usage = """$exename version $version
+
+usage: $exename [OPTIONS] 
 
   OPTIONS
 
@@ -150,9 +156,10 @@ Future<void> main(List<String> arguments) async {
                               ..addOption(prikeyArg, abbr:"p")
                               ..addOption(lastdaysArg, abbr:"d")
                               ..addOption(relayArg, abbr:"r")
-                              ..addFlag(helpArg, abbr:"h", defaultsTo: false);
-    ArgResults argResults = parser.parse(arguments);
+                              ..addFlag(helpArg, abbr:"h", defaultsTo: false)..allowsAnything;
 
+    try {
+      ArgResults argResults = parser.parse(arguments);
       if( argResults[helpArg]) {
         printUsage();
         return;
@@ -185,6 +192,13 @@ Future<void> main(List<String> arguments) async {
         });
         return;
       } 
+    } on FormatException catch (e) {
+      print(e.message);
+      return;
+    } on Exception catch (e) {
+      print(e);
+      return;
+    }    
 
     // the default in case no arguments are given is:
     // get a user's events, then from its type 3 event, gets events of its follows,

pubspec.yaml

@@ -1,6 +1,6 @@
 name: nostr_console
 description: A sample command-line application.
-version: 1.0.0
+version: 0.0.1
 # homepage: https://www.example.com
 
 environment: