chore: 初始化脚手架 — sunny_mochi 企业级 Flutter 模板

Core 基础设施：Flavor 三包体系、Drift+SQLCipher 加密数据库 7 拦截器 Dio 网络栈、CrashReporter 崩溃日志、Sealed Failure 错误体系 5 色板主题系统、Auth 认证骨架（Clean Architecture）、Dev Panel、Mock Adapter 通过验证：flutter analyze（0 errors）、flutter test（全绿）、staging APK 74.8MB
2026-05-14 12:51:05 +08:00
commit 61017f1c39
204 changed files with 15386 additions and 0 deletions
@@ -0,0 +1,36 @@
+import 'package:intl/intl.dart';
+
+extension DateTimeX on DateTime {
+  /// yyyy-MM-dd
+  String get fmtDate => DateFormat('yyyy-MM-dd').format(this);
+
+  /// yyyy-MM-dd HH:mm:ss
+  String get fmtDateTime => DateFormat('yyyy-MM-dd HH:mm:ss').format(this);
+
+  /// HH:mm
+  String get fmtHm => DateFormat('HH:mm').format(this);
+
+  /// 友好相对时间："刚刚 / 5 分钟前 / 昨天 18:24 / 03-15 / 2024-03-15"
+  String get toFriendly {
+    final now = DateTime.now();
+    final diff = now.difference(this);
+
+    if (diff.inSeconds < 60) return '刚刚';
+    if (diff.inMinutes < 60) return '${diff.inMinutes} 分钟前';
+    if (diff.inHours < 24 && now.day == day) {
+      return '今天 $fmtHm';
+    }
+    if (diff.inDays < 2 && now.day - day == 1) {
+      return '昨天 $fmtHm';
+    }
+    if (year == now.year) {
+      return DateFormat('MM-dd HH:mm').format(this);
+    }
+    return fmtDate;
+  }
+}
+
+extension NullableDateTimeX on DateTime? {
+  String get orPlaceholder => this?.fmtDateTime ?? '-';
+  String get orPlaceholderDate => this?.fmtDate ?? '-';
+}