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..a4e591c7258b901e4f6dc3e71b142a9123eeedd2 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;
+}
 
-void log(String text) {
+bool LOG = const bool.fromEnvironment('LOG', defaultValue: false);
+
+void log(Object text) {
   if (LOG) print(text);
 }
 
@@ -39,3 +49,25 @@ 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');
+  argParser.addOption('cache');
+  return argParser;
+}
+
+void processArgResults(ArgResults argResults) {
+  if (argResults['verbose']) {
+    LOG = true;
+  }
+  if (argResults['cache'] != null) {
+    cache.base = Uri.base.resolve('${argResults['cache']}/');
+  }
+}
+
+void printOptions() {

[Dmitry Stefantsov, 2017/04/06 09:16:10]

Maybe pass 'argParser' here and use 'print(argParser.usage)' instead of
formatting it by hand?

[Johnni Winther, 2017/04/06 10:06:07]

Good call! Done.

+  print("  --verbose, -v           Turn on logging output.");
+  print("  --cache=<dir>           Use <dir> for caching test output.");
+  print("                          Defaults to 'temp/gardening-cache/'.");
+}