Add find_timeouts and caching to tools/gardening

tools/gardening/lib/src/util.dart

Index: tools/gardening/lib/src/util.dart
diff --git a/tools/gardening/lib/src/util.dart b/tools/gardening/lib/src/util.dart
index 278d4e3c29db43e3ba67ceb562614b2e77a1c319..66f986944367fe9fb7bfb4fbf7565bca703e2c0c 100644
--- a/tools/gardening/lib/src/util.dart
+++ b/tools/gardening/lib/src/util.dart
@@ -6,6 +6,10 @@ 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>[];
@@ -27,9 +31,15 @@ String padRight(String text, int 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;
+}
+
+bool LOG = const bool.fromEnvironment('LOG', defaultValue: false);
 
-void log(String text) {
+void log(Object text) {
   if (LOG) print(text);
 }
 
@@ -39,3 +49,22 @@ Future<String> readUriAsText(HttpClient client, Uri uri) async {
   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']}/');
+  }
+}