Setup day 5

bin/adventofcode2025.dart

@@ -2,6 +2,7 @@ import 'package:adventofcode2025/day1/command.dart' as day1;
 import 'package:adventofcode2025/day2/command.dart' as day2;
 import 'package:adventofcode2025/day3/command.dart' as day3;
 import 'package:adventofcode2025/day4/command.dart' as day4;
+import 'package:adventofcode2025/day5/command.dart' as day5;
 
 import 'package:args/command_runner.dart';
 
@@ -11,5 +12,6 @@ void main(List<String> arguments) {
     ..addCommand(day2.Day2Command())
     ..addCommand(day3.Day3Command())
     ..addCommand(day4.Day4Command())
+    ..addCommand(day5.Day5Command())
     ..run(arguments);
 }

inputs/day5/small.txt

@@ -0,0 +1,11 @@
+3-5
+10-14
+16-20
+12-18
+
+1
+5
+8
+11
+17
+32

lib/day4/command.dart

@@ -55,7 +55,7 @@ class Day4Command extends Command {
   final name = "day4";
 
   @override
-  final description = "Run Advent of Code 2025 Day 3";
+  final description = "Run Advent of Code 2025 Day 4";
 
   Day4Command() {
     // we can add command specific arguments here.

lib/day5/command.dart

@@ -0,0 +1,45 @@
+import "dart:convert";
+import "dart:io";
+
+import "package:args/command_runner.dart";
+
+class Day5Command extends Command {
+  // The [name] and [description] properties must be defined by every
+  // subclass.
+  @override
+  final name = "day5";
+
+  @override
+  final description = "Run Advent of Code 2025 Day 5";
+
+  Day5Command() {
+    // we can add command specific arguments here.
+    // [argParser] is automatically created by the parent class.
+  }
+
+  // [run] may also return a Future.
+  @override
+  Future<void> run() async {
+    // [argResults] is set before [run()] is called and contains the flags/options
+    // passed to this command.
+
+    if (argResults!.rest.length != 1) {
+      print(
+        "Expected 1 positional arguments, found ${argResults!.rest.length}",
+      );
+      exit(1);
+    }
+    var filePath = argResults!.rest[0];
+
+    print("Parsing file: $filePath");
+    var inputFile = File(filePath);
+    var result = await inputFile
+        .openRead()
+        .transform(utf8.decoder)
+        .transform(LineSplitter())
+        .map((line) {
+          return line;
+        })
+        .toList();
+  }
+}