Move compact vm config from web_ui to the unittest package.

pkg/unittest/lib/compact_vm_config.dart

+// Copyright (c) 2013, 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.
+
+/**
+ * A test configuration that generates a compact 1-line progress bar. The bar is
+ * updated in-place before and after each test is executed. If all test pass,
+ * you should only see a couple lines in the terminal. If a test fails, the
+ * failure is shown and the progress bar continues to be updated below it.
+ */
+library compact_vm_config;
+
+import 'dart:io';
+import 'package:unittest/unittest.dart';
+
+const String _GREEN = '\u001b[32m';
+const String _RED = '\u001b[31m';
+const String _NONE = '\u001b[0m';
+const int MAX_LINE = 80;
+
+class CompactVMConfiguration extends Configuration {
+  Date _start;
+  int _pass = 0;
+  int _fail = 0;
+
+  void onInit() {
+    super.onInit();
+  }
+
+  void onStart() {
+    super.onStart();
+    _start = new Date.now();
+  }
+
+  void onTestStart(TestCase test) {
+    super.onTestStart(test);
+    _progressLine(_start, _pass, _fail, test.description);
+  }
+
+  void onTestResult(TestCase test) {
+    super.onTestResult(test);
+    if (test.result == PASS) {
+      _pass++;
+      _progressLine(_start, _pass, _fail, test.description);
+    } else {
+      _fail++;
+      _progressLine(_start, _pass, _fail, test.description);
+      print('');
+      if (test.message != '') {
+        print(_indent(test.message));
+      }
+
+      if (test.stackTrace != null && test.stackTrace != '') {
+        print(_indent(test.stackTrace));
+      }
+    }
+  }
+
+  String _indent(String str) {
+    return str.split("\n").mappedBy((line) => "  $line").join("\n");
+  }
+
+  void onDone(int passed, int failed, int errors, List<TestCase> results,
+      String uncaughtError) {
+    var success = false;
+    if (passed == 0 && failed == 0 && errors == 0) {
+      print('\nNo tests ran.');
+    } else if (failed == 0 && errors == 0 && uncaughtError == null) {
+      _progressLine(_start, _pass, _fail, 'All tests pass', _GREEN);
+      print('\nAll $passed tests passed.');
+      success = true;
+    } else {
+      _progressLine(_start, _pass, _fail, 'Some tests fail', _RED);
+      print('');
+      if (uncaughtError != null) {
+        print('Top-level uncaught error: $uncaughtError');
+      }
+      print('$passed PASSED, $failed FAILED, $errors ERRORS');
+    }
+
+    if (!success) exit(1);
+  }
+
+  int _lastLength = 0;
+
+  final int _nonVisiblePrefix = 1 + _GREEN.length + _NONE.length;
+
+  void _progressLine(Date startTime, int passed, int failed, String message,
+      [String color = _NONE]) {
+    var duration = (new Date.now()).difference(startTime);
+    var buffer = new StringBuffer();
+    // \r moves back to the beginnig of the current line.
+    buffer.add('\r${_timeString(duration)} ');
+    buffer.add(_GREEN);
+    buffer.add('+');
+    buffer.add(passed);
+    buffer.add(_NONE);
+    if (failed != 0) buffer.add(_RED);
+    buffer.add(' -');
+    buffer.add(failed);
+    if (failed != 0) buffer.add(_NONE);
+    buffer.add(': ');
+    buffer.add(color);
+
+    int nonVisible = _nonVisiblePrefix + color.length  +
+        (failed != 0 ? (_RED.length + _NONE.length) : 0);
+    int len = buffer.length - nonVisible;
+    var mx = MAX_LINE - len;
+    buffer.add(_snippet(message, MAX_LINE - len));
+    buffer.add(_NONE);
+
+    // Pad the rest of the line so that it looks erased.
+    len = buffer.length - nonVisible - _NONE.length;
+    if (len > _lastLength) {
+      _lastLength = len;
+    } else {
+      while (len < _lastLength) {
+        buffer.add(' ');
+        _lastLength--;
+      }
+    }
+    stdout.writeString(buffer.toString());
+  }
+
+  String _padTime(int time) =>
+    (time == 0) ? '00' : ((time < 10) ? '0$time' : '$time');
+
+  String _timeString(Duration duration) {
+    var min = duration.inMinutes;
+    var sec = duration.inSeconds % 60;
+    return '${_padTime(min)}:${_padTime(sec)}';
+  }
+
+  String _snippet(String text, int maxLength) {
+    // Return the full message if it fits
+    if (text.length <= maxLength) return text;
+
+    // If we can fit the first and last three words, do so.
+    var words = text.split(' ');
+    if (words.length > 1) {
+      int i = words.length;
+      var len = words.first.length + 4;
+      do {
+        len += 1 + words[--i].length;
+      } while (len <= maxLength && i > 0);
+      if (len > maxLength || i == 0) i++;
+      if (i < words.length - 4) {
+        // Require at least 3 words at the end.
+        var buffer = new StringBuffer();
+        buffer.add(words.first);
+        buffer.add(' ...');
+        for (; i < words.length; i++) {
+          buffer.add(' ');
+          buffer.add(words[i]);
+        }
+        return buffer.toString();
+      }
+    }
+
+    // Otherwise truncate to return the trailing text, but attempt to start at
+    // the beginning of a word.
+    var res = text.substring(text.length - maxLength + 4);
+    var firstSpace = res.indexOf(' ');
+    if (firstSpace > 0) {
+      res = res.substring(firstSpace);
+    }
+    return '...$res';
+  }
+}
+
+void useCompactVMConfiguration() {
+  configure(new CompactVMConfiguration());
+}