Implement 'compact' progress indicator.

tools/testing/dart/test_progress.dart

+// Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+#library("test_progress");
+
+#import("test_runner.dart");
+
+class ProgressIndicator {
+  ProgressIndicator() : _startTime = new Date.now();
+
+  void testAdded() => _foundTests++;
+
+  void start(TestCase test) {
+    _printProgress();
+  }
+
+  void done(TestCase test) {
+    if (test.output.unexpectedOutput) {
+      _failedTests++;
+      _printFailureOutput(test);
+    } else {
+      _passedTests++;
+    }
+    _printProgress();
+  }
+
+  abstract _printProgress();
+
+  String _pad(String s, int length) {
+    StringBuffer buffer = new StringBuffer();
+    for (int i = s.length; i < length; i++) {
+      buffer.add(' ');
+    }
+    buffer.add(s);
+    return buffer.toString();
+  }
+
+  String _padTime(int time) {
+    if (time == 0) {
+      return '00';
+    } else if (time < 10) {
+      return '0$time';
+    } else {
+      return '$time';
+    }
+  }
+
+  String _timeString() {
+    Duration d = (new Date.now()).difference(_startTime);
+    var min = d.inMinutes;
+    var sec = d.inSeconds;
+    return '${_padTime(min)}:${_padTime(sec)}';
+  }
+
+  void _printFailureOutput(TestCase test) {
+    print('FAILED: ${test.displayName}');
+    if (!test.output.stdout.isEmpty()) {
+      print('\nstdout:');
+      test.output.stdout.forEach((s) => print(s));
+    }
+    if (!test.output.stderr.isEmpty()) {
+      print('\nstderr:');
+      test.output.stderr.forEach((s) => print(s));
+    }
+    print('\nCommand line: ${test.commandLine}');
+  }
+
+  int _completedTests() => _passedTests + _failedTests;
+
+  int _foundTests = 0;
+  int _passedTests = 0;
+  int _failedTests = 0;
+  Date _startTime;
+}
+
+
+class CompactProgressIndicator extends ProgressIndicator {
+  void _printProgress() {
+    var percent = ((_completedTests() / _foundTests) * 100).floor().toString();
+    var percentPadded = _pad(percent, 5);
+    var passedPadded = _pad(_passedTests.toString(), 5);
+    var failedPadded = _pad(_failedTests.toString(), 5);
+    var progressLine = 
+      '[${_timeString()} | $percentPadded% | +$passedPadded | -$failedPadded]';
+    // TODO(ager): Instead of using print we should write this to
+    // stdout and use \r to reuse the same line.
+    print(progressLine);
+  }
+}
+