Complete day 4 part 1

lib/day4/command.dart

@@ -3,6 +3,27 @@ import "dart:io";
 
 import "package:args/command_runner.dart";
 
+List getAdjacent(List<List<bool>> map, int idx, int idy) {
+  var adjacentValues = [];
+  for (int x in [-1, 0, 1]) {
+    for (int y in [-1, 0, 1]) {
+      if (x == 0 && y == 0) {
+        continue;
+      }
+      var xSlewed = idx + x;
+      var ySlewed = idy + y;
+      //print("$xSlewed, $ySlewed");
+      try {
+        //print(map[ySlewed][xSlewed]);
+        adjacentValues.insert(adjacentValues.length, map[ySlewed][xSlewed]);
+      } on RangeError {
+        continue;
+      }
+    }
+  }
+  return adjacentValues;
+}
+
 class Day4Command extends Command {
   // The [name] and [description] properties must be defined by every
   // subclass.
@@ -32,5 +53,36 @@ class Day4Command extends Command {
     var filePath = argResults!.rest[0];
 
     print("Parsing file: $filePath");
+    var inputFile = File(filePath);
+    var paperRollMap = await inputFile
+        .openRead()
+        .transform(utf8.decoder)
+        .transform(LineSplitter())
+        .map((line) {
+          return line
+              .split('')
+              .map((ch) => (ch == "@") ? true : false)
+              .toList(growable: false);
+        })
+        .toList();
+    //print(paperRollMap);
+    //print(getAdjacent(paperRollMap, 0, 0));
+
+    int accumulator = 0;
+    for (var (y, row) in paperRollMap.indexed) {
+      for (var (x, columnValue) in row.indexed) {
+        if (columnValue == true) {
+          var numAdjacent = getAdjacent(
+            paperRollMap,
+            x,
+            y,
+          ).where((value) => value).length;
+          if (numAdjacent < 4) {
+            accumulator++;
+          }
+        }
+      }
+    }
+    print("Part 1 Result: $accumulator");
   }
 }