first cut cmdline analysis server launcher

pkg/analysis_server/bin/dartdeps.dart

Index: pkg/analysis_server/bin/dartdeps.dart
diff --git a/pkg/analysis_server/bin/dartdeps.dart b/pkg/analysis_server/bin/dartdeps.dart
new file mode 100644
index 0000000000000000000000000000000000000000..e67cd1e029dae09954ba4358a48fcfc49b198a8e
--- /dev/null
+++ b/pkg/analysis_server/bin/dartdeps.dart
@@ -0,0 +1,104 @@
+// Copyright (c) 2014, 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:io';
+
+import 'package:args/args.dart';
+import 'package:analysis_server/src/analysis_manager.dart';
+
+/**
+ * Start analysis server as a separate process and use the websocket protocol
+ * to analyze the application specified on the command line.
+ */
+void main(List<String> args) {
+  _DartDependencyAnalyzer analyzer = new _DartDependencyAnalyzer();
+  analyzer.start(args);
+}
+
+/**
+ * Instances of [_DartDependencyAnalyzer] launch an analysis server and use
+ * that server to analyze the dependencies of an application.
+ */
+class _DartDependencyAnalyzer {
+  /**
+   * The name of the application that is used to start the analyzer.
+   */
+  static const BINARY_NAME = 'dartdeps';
+
+  /**
+   * The name of the option used to print usage information.
+   */
+  static const String HELP_OPTION = "help";
+
+  /**
+   * Parse the command line arguments to determine the application to be
+   * analyzed, then launch and manage an analysis server to do the work.
+   * If there is a problem with the given arguments, then return a non zero
+   * value, otherwise return zero.
+   */
+  void start(List<String> args) {
+    var parser = new ArgParser();
+    parser.addFlag(HELP_OPTION, help:
+        "print this help message without starting analysis", defaultsTo: false,
+        negatable: false);
+
+    // Parse arguments
+    ArgResults results = parser.parse(args);
+    if (results[HELP_OPTION]) {
+      printUsage(parser);
+      return;
+    }
+    if (results.rest.length == 0) {
+      printUsage(parser);
+      exitCode = 1;
+      return;
+    }
+    Directory appDir = new Directory(results.rest[0]);
+    if (!appDir.existsSync()) {
+      print('Specified application directory does not exist: $appDir');
+      print('');
+      printUsage(parser);
+      exitCode = 1;
+      return;
+    }
+    if (results.rest.length > 1) {
+      print('Unexpected arguments after $appDir');
+      print('');
+      printUsage(parser);
+      exitCode = 1;
+      return;
+    }
+
+    // Assume that the analysis server entry point is in the same directory
+    StringBuffer path = new StringBuffer();
+    path.write(FileSystemEntity.parentOf(Platform.script.toFilePath()));
+    path.write(Platform.pathSeparator);
+    path.write("server.dart");
+
+    // Launch analysis server
+    AnalysisManager.start(path.toString()).then(analyze);
+  }
+
+  void analyze(AnalysisManager mgr) {
+    print("Analyzing...");
+    new Timer(new Duration(seconds: 5), () {
+      if (mgr.stop()) {
+        print("stopped");
+      } else {
+        print("already stopped");
+      }
+    });
+  }
+
+  /**
+   * Print information about how to use the server.
+   */
+  void printUsage(ArgParser parser) {
+    print('Usage: $BINARY_NAME [flags] <application_directory>');
+    print('');
+    print('Supported flags are:');
+    print(parser.getUsage());
+  }
+}