initial commit

lib/foundation/log.dart

@@ -0,0 +1,99 @@
+import 'dart:io';
+
+import 'package:flutter/foundation.dart';
+import 'package:venera/utils/ext.dart';
+
+class LogItem {
+  final LogLevel level;
+  final String title;
+  final String content;
+  final DateTime time = DateTime.now();
+
+  @override
+  toString() => "${level.name} $title $time \n$content\n\n";
+
+  LogItem(this.level, this.title, this.content);
+}
+
+enum LogLevel { error, warning, info }
+
+class Log {
+  static final List<LogItem> _logs = <LogItem>[];
+
+  static List<LogItem> get logs => _logs;
+
+  static const maxLogLength = 3000;
+
+  static const maxLogNumber = 500;
+
+  static bool ignoreLimitation = false;
+
+  /// only for debug
+  static const String? logFile = null;
+
+  static void printWarning(String text) {
+    print('\x1B[33m$text\x1B[0m');
+  }
+
+  static void printError(String text) {
+    print('\x1B[31m$text\x1B[0m');
+  }
+
+  static void addLog(LogLevel level, String title, String content) {
+    if (!ignoreLimitation && content.length > maxLogLength) {
+      content = "${content.substring(0, maxLogLength)}...";
+    }
+
+    if (kDebugMode) {
+      switch (level) {
+        case LogLevel.error:
+          printError(content);
+        case LogLevel.warning:
+          printWarning(content);
+        case LogLevel.info:
+          print(content);
+      }
+    }
+
+    var newLog = LogItem(level, title, content);
+
+    if (newLog == _logs.lastOrNull) {
+      return;
+    }
+
+    _logs.add(newLog);
+    if(logFile != null) {
+      File(logFile!).writeAsString(newLog.toString(), mode: FileMode.append);
+    }
+    if (_logs.length > maxLogNumber) {
+      var res = _logs.remove(
+          _logs.firstWhereOrNull((element) => element.level == LogLevel.info));
+      if (!res) {
+        _logs.removeAt(0);
+      }
+    }
+  }
+
+  static info(String title, String content) {
+    addLog(LogLevel.info, title, content);
+  }
+
+  static warning(String title, String content) {
+    addLog(LogLevel.warning, title, content);
+  }
+
+  static error(String title, String content) {
+    addLog(LogLevel.error, title, content);
+  }
+
+  static void clear() => _logs.clear();
+
+  @override
+  String toString() {
+    var res = "Logs\n\n";
+    for (var log in _logs) {
+      res += log.toString();
+    }
+    return res;
+  }
+}