First pass at a generic reusable command line option parser.

lib/args/example.dart

Index: lib/args/example.dart
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+// Copyright (c) 2012, 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.
+
+/// This is an example of converting the args in test.dart to use this API.
+/// It shows what it looks like to build an [ArgParser] and then, when the code
+/// is run, demonstrates what the generated usage text looks like.
+#library('example');
+
+#import('dart:io');
+
+#import('args.dart');
+
+main() {
+  var parser = new ArgParser();
+
+  parser.addOption('mode', abbr: 'm', defaultsTo: 'debug',
+      help: 'Mode in which to run the tests',
+      allowed: ['all', 'debug', 'release']);
+
+  parser.addOption('compiler', abbr: 'c', defaultsTo: 'none',
+      help: 'Specify any compilation step (if needed).',
+      allowed: ['none', 'dart2js', 'dartc', 'frog'],
+      allowedHelp: {
+        'none': 'Do not compile the Dart code (run native Dart code on the VM).\n'

[Siggi Cherem (dart-lang), 2012/05/02 22:07:43]

80 col

[Bob Nystrom, 2012/05/03 00:23:40]

Done.

+          '(only valid with the following runtimes: vm, drt)',
+        'dart2js': 'Compile dart code to JavaScript by running dart2js (leg).\n'
+          '(only valid with the following runtimes: same as frog)',
+        'dartc': 'Perform static analysis on Dart code by running dartc.\n'
+          '(only valid with the following runtimes: none)',
+        'frog': '(DEPRECATED) Compile dart code to JavaScript by running the\n'
+          'frog compiler. (only valid with the following runtimes: d8,\n'
+          'drt, chrome, safari, ie, firefox, opera, none (compile only))'
+      });
+
+  parser.addOption('runtime', abbr: 'r', defaultsTo: 'vm',
+      help: 'Where the tests should be run.',
+      allowed: ['vm', 'd8', 'drt', 'dartium', 'ff', 'firefox', 'chrome',
+              'safari', 'ie', 'opera', 'none'],
+      allowedHelp: {
+        'vm': 'Run Dart code on the standalone dart vm.',
+        'd8': 'Run JavaScript from the command line using v8.',
+        'drt': 'Run Dart or JavaScript in the headless version of Chrome,\n'
+          'DumpRenderTree.',
+        'dartium': 'Run Dart or JavaScript in Dartium.',
+        'ff': 'Run JavaScript in Firefox',
+        'chrome': 'Run JavaScript in Chrome',
+        'safari': 'Run JavaScript in Safari',
+        'ie': 'Run JavaScript in Internet Explorer',
+        'opera': 'Run JavaScript in Opera',
+        'none': 'No runtime, compile only (for example, used for dartc static\n'
+          'analysis tests).',
+      });
+
+  parser.addOption('arch', abbr: 'a', defaultsTo: 'ia32',
+      help: 'The architecture to run tests for',
+      allowed: ['all', 'ia32', 'x64', 'simarm']);
+
+  parser.addOption('system', abbr: 's', defaultsTo: Platform.operatingSystem(),
+      help: 'The operating system to run tests on',
+      allowed: ['linux', 'macos', 'windows']);
+
+  parser.addFlag('checked', defaultsTo: false,
+      help: 'Run tests in checked mode');
+
+  parser.addFlag('host-checked', defaultsTo: false,
+      help: 'Run compiler in checked mode');
+
+  parser.addOption('timeout', abbr: 't',
+      help: 'Timeout in seconds');
+
+  parser.addOption('progress', abbr: 'p', defaultsTo: 'compact',
+      help: 'Progress indication mode',
+      allowed: ['compact', 'color', 'line', 'verbose', 'silent', 'status',
+                'buildbot']);
+
+  parser.addFlag('report', defaultsTo: false,
+      help: 'Print a summary report of the number of tests, by expectation');
+
+  parser.addOption('tasks', abbr: 'j',
+      defaultsTo: Platform.numberOfProcessors().toString(),
+      help: 'The number of parallel tasks to run');
+
+  parser.addOption('shards', defaultsTo: '1',
+      help: 'The number of instances that the tests will be sharded over');
+
+  parser.addOption('shard', defaultsTo: '1',
+      help: 'The index of this instance when running in sharded mode');
+
+  parser.addFlag('verbose', abbr: 'v', defaultsTo: false,
+      help: 'Verbose output');
+
+  parser.addFlag('list', defaultsTo: false,
+      help: 'List tests only, do not run them');
+
+  parser.addFlag('keep-generated-tests', defaultsTo: false,
+      help: 'Keep the generated files in the temporary directory');
+
+  parser.addFlag('valgrind', defaultsTo: false,
+      help: 'Run tests through valgrind');
+
+  parser.addOption('special-command',
+      help: """Special command support. Wraps the command line in
+a special command. The special command should contain
+an '@' character which will be replaced by the normal
+command.
+
+For example if the normal command that will be executed
+is 'dart file.dart' and you specify special command
+'python -u valgrind.py @ suffix' the final command will be
+'python -u valgrind.py dart file.dart suffix'""");
+
+  parser.addFlag('time',
+      help: 'Print timing information after running tests',
+      defaultsTo: false);
+
+  parser.addOption('frog',    help: 'Path to frog script or executable');
+  parser.addOption('dart',    help: 'Path to dart executable');
+  parser.addOption('drt',     help: 'Path to DumpRenderTree executable');
+  parser.addOption('dartium', help: 'Path to Dartium Chrome executable');
+  parser.addOption('froglib', help: 'Path to frog library');
+
+  parser.addFlag('batch', abbr: 'b',
+      help: 'Run browser tests in batch mode',
+      defaultsTo: true);
+
+  print(parser.getUsage());
+}