Setup framework for running days from single command

bin/adventofcode2025.dart

@@ -1,5 +1,29 @@
-import 'package:adventofcode2025/adventofcode2025.dart' as adventofcode2025;
+import 'dart:io';
+
+import 'package:adventofcode2025/day1/main.dart' as day1;
+
+import 'package:args/args.dart';
+
+const help = 'help';
+const dayNumber = 'day';
 
 void main(List<String> arguments) {
-  print('Hello world: ${adventofcode2025.calculate()}!');
+  final parser = ArgParser()
+    ..addFlag(help, negatable: false, abbr: 'h')
+    ..addOption(dayNumber, mandatory: true, abbr: "d");
+  var results = parser.parse(arguments);
+
+  if (results.flag(help)) {
+    print(parser.usage);
+    exit(0);
+  }
+
+  var day = results.option(dayNumber);
+
+  switch (day) {
+    case '1':
+      day1.run();
+    default:
+      print("'$day' is not a valid value for option $dayNumber");
+  }
 }

lib/adventofcode2025.dart

@@ -1,3 +0,0 @@
-int calculate() {
-  return 6 * 7;
-}

lib/day1/main.dart

@@ -0,0 +1,3 @@
+void run() {
+  print("Hello World Day 1");
+}

pubspec.lock

@@ -18,7 +18,7 @@ packages:
     source: hosted
     version: "8.1.1"
   args:
-    dependency: transitive
+    dependency: "direct main"
     description:
       name: args
       sha256: d0481093c50b1da8910eb0bb301626d4d8eb7284aa739614d2b394ee09e3ea04

pubspec.yaml

@@ -8,6 +8,7 @@ environment:
 
 # Add regular dependencies here.
 dependencies:
+  args: ^2.7.0
   # path: ^1.8.0
 
 dev_dependencies: