support --options flag and other analysis options flags in DDC

pkg/dev_compiler/lib/src/compiler/command.dart

 // Copyright (c) 2016, 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:io';
 import 'package:analyzer/src/command_line/arguments.dart'
     show
         defineAnalysisArguments,
         filterUnknownArguments,
         ignoreUnrecognizedFlagsFlag;
@@ skipping 14 matching lines @@
 ///
 /// This handles argument parsing, usage, error handling.
 /// See bin/dartdevc.dart for the actual entry point, which includes Bazel
 /// worker support.
 int compile(List<String> args, {void printFn(Object obj)}) {
   printFn ??= print;
 
   ArgResults argResults;
   AnalyzerOptions analyzerOptions;
   try {
-    var parser = _argParser();
+    var parser = ddcArgParser();
     if (args.contains('--$ignoreUnrecognizedFlagsFlag')) {
       args = filterUnknownArguments(args, parser);
     }
     argResults = parser.parse(args);
     analyzerOptions = new AnalyzerOptions.fromArguments(argResults);
   } on FormatException catch (error) {
     printFn('$error\n\n$_usageMessage');
     return 64;
   }
 
@@ skipping 30 matching lines @@
     dartdevc arguments: ${args.join(' ')}
     dart --version: ${Platform.version}
 ```
 $error
 $stackTrace
 ```''');
     return 70;
   }
 }
 
-ArgParser _argParser({bool hide: true}) {
+ArgParser ddcArgParser({bool hide: true}) {
   var argParser = new ArgParser(allowTrailingOptions: true)
     ..addFlag('help',
         abbr: 'h',
         help: 'Display this message.\n'
             'Add --verbose to show hidden options.',
         negatable: false)
     ..addFlag('verbose', abbr: 'v', help: 'Verbose output.')
     ..addFlag(ignoreUnrecognizedFlagsFlag,
         help: 'Ignore unrecognized command line flags.',
         defaultsTo: false,
@@ skipping 17 matching lines @@
   var length = list1.length;
   if (length != list2.length) return true;
   for (var i = 0; i < length; ++i) {
     if (list1[i] != list2[i]) return true;
   }
   return false;
 }
 
 void _compile(ArgResults argResults, AnalyzerOptions analyzerOptions,
     void printFn(Object obj)) {
-  var compiler = new ModuleCompiler(analyzerOptions);
+  var libraryRoot = argResults['library-root'] as String;
+  if (libraryRoot != null) {
+    libraryRoot = path.absolute(libraryRoot);
+  } else {
+    libraryRoot = Directory.current.path;
+  }
+
+  var compiler = new ModuleCompiler(libraryRoot, analyzerOptions);
   var compilerOpts = new CompilerOptions.fromArguments(argResults);
   var outPaths = argResults['out'] as List<String>;
   var moduleFormats = parseModuleFormatOption(argResults);
   bool singleOutFile = argResults['single-out-file'];
   if (singleOutFile) {
     for (var format in moduleFormats) {
       if (format != ModuleFormat.amd && format != ModuleFormat.legacy) {
         _usageException('Format $format cannot be combined with '
             'single-out-file. Only amd and legacy modes are supported.');
       }
     }
   }
 
   if (outPaths.isEmpty) {
     _usageException('Please include the output file location. For example:\n'
         '    -o PATH/TO/OUTPUT_FILE.js');
   } else if (outPaths.length != moduleFormats.length) {
     _usageException('Number of output files (${outPaths.length}) must match '
         'number of module formats (${moduleFormats.length}).');
   }
 
   // TODO(jmesserly): for now the first one is special. This will go away once
   // we've removed the "root" and "module name" variables.
   var firstOutPath = outPaths[0];
 
-  var libraryRoot = argResults['library-root'] as String;
-  if (libraryRoot != null) {
-    libraryRoot = path.absolute(libraryRoot);
-  } else {
-    libraryRoot = Directory.current.path;
-  }
   var moduleRoot = argResults['module-root'] as String;
   String modulePath;
   if (moduleRoot != null) {
     moduleRoot = path.absolute(moduleRoot);
     if (!path.isWithin(moduleRoot, firstOutPath)) {
       _usageException('Output file $firstOutPath must be within the module '
           'root directory $moduleRoot');
     }
     modulePath =
         path.withoutExtension(path.relative(firstOutPath, from: moduleRoot));
@@ skipping 52 matching lines @@
 
   _usageException(
       'Imported file "${source.uri}" was not found as a summary or source '
       'file. Please pass in either the summary or the source file '
       'for this import.');
   return null; // unreachable
 }
 
 String get _usageMessage =>
     'Dart Development Compiler compiles Dart into a JavaScript module.'
-    '\n\n${_argParser(hide: !_verbose).usage}';
+    '\n\n${ddcArgParser(hide: !_verbose).usage}';
 
 void _usageException(String message) {
   throw new UsageException(message, _usageMessage);
 }
 
 /// Thrown when the input source code has errors.
 class CompileErrorException implements Exception {
   toString() => '\nPlease fix all errors before compiling (warnings are okay).';
 }