Flutter日志工具类

// flog.dart
// ilog("msg info"); 调用方式

import 'package:flutter/foundation.dart';
import 'package:stack_trace/stack_trace.dart';

const String _tag = "fred_";
const bool _logOpen = true;

enum FLogMode {
  debug,    // 💚 DEBUG
  warning,  // 💛 WARNING
  info,     // 💙 INFO
  error,    // ❤️ ERROR
}

void _log(dynamic msg, FLogMode mode){
  if (kReleaseMode || _logOpen == false) { // release 模式不打印
    return;
  }
  var chain = Chain.current(); // Chain.forTrace(StackTrace.current);
  // 将 core 和 flutter 包的堆栈合起来（即相关数据只剩其中一条）
  chain = chain.foldFrames((frame) => frame.isCore || frame.package == "flutter");
  // 取出所有信息帧
  final frames = chain.toTrace().frames;

  // 找到当前函数的信息帧
  final idx;

  var modeStr = "";
  switch(mode) {
    case FLogMode.debug:
      modeStr = "💚 DEBUG";
      idx = frames.indexWhere((element) => element.member == "dlog");
      break;
    case FLogMode.warning:
      modeStr = "💛 WARNING";
      idx = frames.indexWhere((element) => element.member == "wlog");
      break;
    case FLogMode.info:
      modeStr = "💙 INFO";
      idx = frames.indexWhere((element) => element.member == "ilog");
      break;
    case FLogMode.error:
      modeStr = "❤️ ERROR";
      idx = frames.indexWhere((element) => element.member == "elog");
      break;
  }

  if (idx == -1 || idx+1 >= frames.length) {
    return;
  }
  // 调用当前函数的函数信息帧
  final frame = frames[idx+1];

  print("$_tag${frame.uri.toString().split("/").last}(${frame.line}) :: $modeStr  - $msg ");
}

void dlog(dynamic msg, { FLogMode mode = FLogMode.debug }) {
  _log(msg, mode);
}

void elog(dynamic msg, { FLogMode mode = FLogMode.error }) {
  _log(msg, mode);
}

void ilog(dynamic msg, { FLogMode mode = FLogMode.info }) {
  _log(msg, mode);
}

void wlog(dynamic msg, { FLogMode mode = FLogMode.warning }) {
  _log(msg, mode);
}