Add find_timeouts and caching to tools/gardening

tools/gardening/lib/src/util.dart

 // Copyright (c) 2017, 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.
 
 import 'dart:async';
 import 'dart:convert';
 import 'dart:io';
 
+import 'package:args/args.dart';
+
+import 'cache.dart';
+
 /// Split [text] using [infixes] as infix markers.
 List<String> split(String text, List<String> infixes) {
   List<String> result = <String>[];
   int start = 0;
   for (String infix in infixes) {
     int index = text.indexOf(infix, start);
     if (index == -1)
       throw "'$infix' not found in '$text' from offset ${start}.";
     result.add(text.substring(start, index));
     start = index + infix.length;
   }
   result.add(text.substring(start));
   return result;
 }
 
 /// Pad [text] with spaces to the right to fit [length].
 String padRight(String text, int length) {
   if (text.length < length) return '${text}${' ' * (length - text.length)}';
   return text;
 }
 
-const bool LOG = const bool.fromEnvironment('LOG', defaultValue: false);
+/// Pad [text] with spaces to the left to fit [length].
+String padLeft(String text, int length) {
+  if (text.length < length) return '${' ' * (length - text.length)}${text}';
+  return text;
+}
 
-void log(String text) {
+bool LOG = const bool.fromEnvironment('LOG', defaultValue: false);
+
+void log(Object text) {
   if (LOG) print(text);
 }
 
 /// Reads the content of [uri] as text.
 Future<String> readUriAsText(HttpClient client, Uri uri) async {
   HttpClientRequest request = await client.getUrl(uri);
   HttpClientResponse response = await request.close();
   return await response.transform(UTF8.decoder).join();
 }
+
+ArgParser createArgParser() {
+  ArgParser argParser = new ArgParser();
+  argParser.addFlag('verbose',
+      abbr: 'v', negatable: false, help: "Turn on logging output.");
+  argParser.addOption('cache',
+      help: "Use <dir> for caching test output.\n"
+          "Defaults to 'temp/gardening-cache/'.");
+  return argParser;
+}
+
+void processArgResults(ArgResults argResults) {
+  if (argResults['verbose']) {
+    LOG = true;
+  }
+  if (argResults['cache'] != null) {
+    cache.base = Uri.base.resolve('${argResults['cache']}/');
+  }
+}