feat(printer):create one line printer with stack trace

lib/src/printers/one_line_printer.dart

@@ -0,0 +1,151 @@
+import 'dart:convert';
+import 'package:logger/src/ansi_color.dart';
+import 'package:logger/src/log_printer.dart';
+import 'package:logger/src/logger.dart';
+
+/// An implementation of [LogPrinter] that prints everything on one line,
+/// including the function that called the logger function. This makes it
+/// possible to use VSCode's log filter more efficiently.
+/// For example:
+///
+/// ```
+/// [D] _HomePageState.someFunction (package:my_app/pages/home/HomePage.dart:141:12) some_message
+/// ```
+///
+/// So by filtering by 'HomePage' one can see all the logs by that page.
+///
+/// It is also possible to print the time. Anonymous functions have been
+/// replaced by <a> to save space.
+class OneLinePrinter extends LogPrinter {
+  @override
+
+  /// Matches a stacktrace line as generated on Android/iOS devices.
+  /// For example:
+  /// #1      Logger.log (package:logger/src/logger.dart:115:29)
+  static final _deviceStackTraceRegex =
+      RegExp(r'#[0-9]+[\s]+(.+) \(([^\s]+)\)');
+
+  /// Matches a stacktrace line as generated by Flutter web.
+  /// For example:
+  /// packages/logger/src/printers/pretty_printer.dart 91:37
+  static final _webStackTraceRegex =
+      RegExp(r'^((packages|dart-sdk)\/[^\s]+\/)');
+
+  /// Matches a stacktrace line as generated by browser Dart.
+  /// For example:
+  /// dart:sdk_internal
+  /// package:logger/src/logger.dart
+  static final _browserStackTraceRegex =
+      RegExp(r'^(?:package:)?(dart:[^\s]+|[^\s]+)');
+
+  static final levelPrefixes = {
+    Level.verbose: '[V]',
+    Level.debug: '[D]',
+    Level.info: '[I]',
+    Level.warning: '[W]',
+    Level.error: '[E]',
+    Level.wtf: '[WTF]',
+  };
+
+  static final levelColors = {
+    Level.verbose: AnsiColor.fg(AnsiColor.grey(0.5)),
+    Level.debug: AnsiColor.none(),
+    Level.info: AnsiColor.fg(12),
+    Level.warning: AnsiColor.fg(208),
+    Level.error: AnsiColor.fg(196),
+    Level.wtf: AnsiColor.fg(199),
+  };
+
+  final bool printTime;
+  final bool colors;
+
+  OneLinePrinter({this.printTime = false, this.colors = true});
+
+  bool _discardDeviceStacktraceLine(String line) {
+    var match = _deviceStackTraceRegex.matchAsPrefix(line);
+    if (match == null) {
+      return false;
+    }
+    return match.group(2)!.startsWith('package:logger');
+  }
+
+  bool _discardWebStacktraceLine(String line) {
+    var match = _webStackTraceRegex.matchAsPrefix(line);
+    if (match == null) {
+      return false;
+    }
+    return match.group(1)!.startsWith('packages/logger') ||
+        match.group(1)!.startsWith('dart-sdk/lib');
+  }
+
+  bool _discardBrowserStacktraceLine(String line) {
+    var match = _browserStackTraceRegex.matchAsPrefix(line);
+    if (match == null) {
+      return false;
+    }
+    return match.group(1)!.startsWith('package:logger') ||
+        match.group(1)!.startsWith('dart:');
+  }
+
+  String? formatStackTrace(StackTrace? stackTrace, int methodCount) {
+    var lines = stackTrace.toString().split('\n');
+
+    var formatted = <String>[];
+    var count = 0;
+    for (var line in lines) {
+      if (_discardDeviceStacktraceLine(line) ||
+          _discardWebStacktraceLine(line) ||
+          _discardBrowserStacktraceLine(line) ||
+          line.isEmpty) {
+        continue;
+      }
+
+      line = line.replaceFirst(RegExp(r'#\d+\s+'), '');
+      //shorten anonymous closures to <a>
+      formatted.add('${line.replaceFirst(".<anonymous closure>", '<a>')}');
+      if (++count == methodCount) {
+        break;
+      }
+    }
+
+    if (formatted.isEmpty) {
+      return null;
+    } else {
+      return formatted.join('\n');
+    }
+  }
+
+  @override
+  List<String> log(LogEvent event) {
+    String? stackTraceStr;
+    //methodCount is 1 to save space.
+    if (event.stackTrace == null) {
+      stackTraceStr = formatStackTrace(StackTrace.current, 1);
+    } else {
+      stackTraceStr = formatStackTrace(event.stackTrace, 1);
+    }
+    var messageStr = _stringifyMessage(event.message);
+    var errorStr = event.error != null ? '  ERROR: ${event.error}' : '';
+    var timeStr = printTime ? 'TIME: ${DateTime.now().toIso8601String()}' : '';
+    return [
+      '${_labelFor(event.level)} $stackTraceStr $timeStr $messageStr$errorStr'
+    ];
+  }
+
+  String _labelFor(Level level) {
+    var prefix = levelPrefixes[level]!;
+    var color = levelColors[level]!;
+
+    return colors ? color(prefix) : prefix;
+  }
+
+  String _stringifyMessage(dynamic message) {
+    final finalMessage = message is Function ? message() : message;
+    if (finalMessage is Map || finalMessage is Iterable) {
+      var encoder = JsonEncoder.withIndent(null);
+      return encoder.convert(finalMessage);
+    } else {
+      return finalMessage.toString();
+    }
+  }
+}