chore: initial commit Dutra Store POS app

lib/utils/rupiah_input.dart

@@ -0,0 +1,60 @@
+import 'package:flutter/services.dart';
+
+class RupiahInputFormatter extends TextInputFormatter {
+  @override
+  TextEditingValue formatEditUpdate(
+      TextEditingValue oldValue, TextEditingValue newValue) {
+    if (newValue.text.isEmpty) {
+      return newValue;
+    }
+
+    final digits = newValue.text.replaceAll(RegExp(r'[^0-9]'), '');
+    if (digits.isEmpty) {
+      return const TextEditingValue(text: '');
+    }
+
+    final formatted = _formatRupiah(digits);
+
+    int newOffset = formatted.length;
+    if (oldValue.text.isNotEmpty) {
+      final oldLength = oldValue.text.replaceAll(RegExp(r'[^0-9]'), '').length;
+      final newLength = digits.length;
+      final oldCursor = oldValue.selection.baseOffset;
+
+      if (newLength < oldLength) {
+        final digitsBeforeCursor = oldValue.text.substring(0, oldCursor).replaceAll(RegExp(r'[^0-9]'), '').length;
+        newOffset = (digitsBeforeCursor).clamp(0, formatted.length);
+      } else if (oldCursor < oldValue.text.length) {
+        final digitsBeforeCursor = oldValue.text.substring(0, oldCursor).replaceAll(RegExp(r'[^0-9]'), '').length;
+        newOffset = (digitsBeforeCursor).clamp(0, formatted.length);
+      }
+    }
+
+    return TextEditingValue(
+      text: formatted,
+      selection: TextSelection.collapsed(offset: newOffset),
+    );
+  }
+
+  String _formatRupiah(String digits) {
+    final buffer = StringBuffer();
+    final len = digits.length;
+    for (int i = 0; i < len; i++) {
+      if (i > 0 && (len - i) % 3 == 0) {
+        buffer.write('.');
+      }
+      buffer.write(digits[i]);
+    }
+    return buffer.toString();
+  }
+
+  static String formatNumber(int number) {
+    return RupiahInputFormatter()._formatRupiah(number.toString());
+  }
+
+  static int? getRawValue(String formattedText) {
+    final digits = formattedText.replaceAll(RegExp(r'[^0-9]'), '');
+    if (digits.isEmpty) return null;
+    return int.tryParse(digits);
+  }
+}