Remove io dependency

This made the SimplePrinter incompatible with the web platform for little
upside. I'd rather not maintain a seperate colors class but the stdlib defines
it in 'io' which is not great.

Author: haarts

README.md

@@ -90,6 +90,10 @@ var logger = Logger(
 ```
 
 
+You can try to auto detect if the attached terminal supports ANSI escape 
+characters by using the output of `io.stdout.supportsAnsiEscapes` as value for 
+the `colors` argument (assuming you have imported the `io` package with `import 'dart:io' as io;`).
+
 ## LogFilter
 
 The `LogFilter` decides which log events should be shown and which don't.<br>
@@ -180,4 +184,4 @@ AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 SOFTWARE.
-```
+```

example/main.dart

@@ -1,5 +1,4 @@
 import 'package:logger/logger.dart';
-import 'package:logger/src/printers/simple_printer.dart';
 
 var logger = Logger(
   printer: PrettyPrinter(),

lib/logger.dart

@@ -12,13 +12,11 @@ export 'src/outputs/memory_output.dart';
 
 export 'src/printers/pretty_printer.dart';
 export 'src/printers/logfmt_printer.dart';
+export 'src/printers/simple_printer.dart';
 
 export 'src/log_output.dart'
     if (dart.library.io) 'src/outputs/file_output.dart';
 
-export 'src/log_printer.dart'
-    if (dart.library.io) 'src/printers/simple_printer.dart';
-
 export 'src/log_filter.dart';
 export 'src/log_output.dart';
 export 'src/log_printer.dart';

lib/src/ansi_color.dart

@@ -1,3 +1,4 @@
+/// This class handles colorizing of terminal output.
 class AnsiColor {
   /// ANSI Control Sequence Introducer, signals the terminal for new settings.
   static const ansiEsc = '\x1B[';

lib/src/printers/simple_printer.dart

@@ -1,10 +1,8 @@
 import 'dart:convert';
-import 'dart:io' as io;
-
-import 'package:io/ansi.dart';
 
 import 'package:logger/src/logger.dart';
 import 'package:logger/src/log_printer.dart';
+import 'package:logger/src/ansi_color.dart';
 
 /// Outputs simple log messages:
 /// ```
@@ -21,24 +19,18 @@ class SimplePrinter extends LogPrinter {
   };
 
   static final levelColors = {
-    Level.verbose: darkGray,
-    Level.debug: defaultForeground,
-    Level.info: blue,
-    Level.warning: yellow,
-    Level.error: magenta,
-    Level.wtf: red,
+    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),
   };
 
   bool printTime;
-
-  /// You can override the auto detected color support with this property. This
-  /// is useful when Dart incorrectly reports a terminal not supporting colors.
-  /// This happens, for example, when running the Dart program under Tmux or
-  /// screen. See https://github.com/dart-lang/sdk/issues/31606.
   bool useColor;
 
-  SimplePrinter({this.printTime = false})
-      : useColor = io.stdout.supportsAnsiEscapes;
+  SimplePrinter({this.printTime = false, this.useColor = true});
 
   @override
   List<String> log(LogEvent event) {
@@ -52,7 +44,7 @@ class SimplePrinter extends LogPrinter {
     var prefix = levelPrefixes[level];
     var color = levelColors[level];
 
-    return overrideAnsiOutput(useColor, () => color.wrap(prefix));
+    return useColor ? color(prefix) : prefix;
   }
 
   String _stringifyMessage(dynamic message) {

pubspec.yaml

@@ -1,14 +1,11 @@
 name: logger
 description: Small, easy to use and extensible logger which prints beautiful logs.
-version: 0.8.3
+version: 0.9.0
 homepage: https://github.com/leisim/logger
 
 environment:
   sdk: ">=2.2.0 <3.0.0"
 
-dependencies:
-  io: ^0.3.3
-
 dev_dependencies:
   test: any
   pedantic: ^1.9.0

test/printers/simple_printer_test.dart

@@ -6,7 +6,7 @@ const ansiEscapeLiteral = '\x1B';
 
 void main() {
   var event = LogEvent(
-    Level.debug,
+    Level.verbose,
     'some message',
     'some error',
     StackTrace.current,
@@ -20,7 +20,7 @@ void main() {
     var outputs = plainPrinter.log(event);
 
     expect(outputs, hasLength(1));
-    expect(outputs[0], '[D]  some message  ERROR: some error');
+    expect(outputs[0], '[V]  some message  ERROR: some error');
   });
 
   group('color', () {