Removed fixed dependencies

packages/usage/lib/src/usage_impl_io.dart

 // 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.
 
+library usage_impl_io;
+
 import 'dart:async';
-import 'dart:convert' show JSON, JsonEncoder;
+import 'dart:convert' show JSON;
 import 'dart:io';
 
 import 'package:path/path.dart' as path;
 
 import 'usage_impl.dart';
 
-/// An interface to a Google Analytics session, suitable for use in command-line
-/// applications.
-///
-/// `trackingId`, `applicationName`, and `applicationVersion` values should be supplied.
-/// `analyticsUrl` is optional, and lets user's substitute their own analytics URL for
-/// the default.
-///
-/// `documentDirectory` is where the analytics settings are stored. It
-/// defaults to the user home directory. For regular `dart:io` apps this doesn't need to
-/// be supplied. For Flutter applications, you should pass in a value like
-/// `PathProvider.getApplicationDocumentsDirectory()`.
-class AnalyticsIO extends AnalyticsImpl {
-  AnalyticsIO(
-      String trackingId, String applicationName, String applicationVersion,
-      {String analyticsUrl, Directory documentDirectory})
-      : super(
-            trackingId,
-            new IOPersistentProperties(applicationName,
-                documentDirPath: documentDirectory?.path),
-            new IOPostHandler(),
-            applicationName: applicationName,
-            applicationVersion: applicationVersion,
-            analyticsUrl: analyticsUrl) {
-    final String locale = getPlatformLocale();
-    if (locale != null) {
-      setSessionValue('ul', locale);
-    }
-  }
+String _createUserAgent() {
+  // Mozilla/5.0 (iPhone; U; CPU iPhone OS 5_1_1 like Mac OS X; en)
+  // Dart/1.8.0-edge.41170 (macos; macos; macos; null)
+  String os = Platform.operatingSystem;
+  String locale = Platform.environment['LANG'];
+  return "Dart/${_dartVersion()} (${os}; ${os}; ${os}; ${locale})";
 }
 
-String _createUserAgent() {
-  final String locale = getPlatformLocale() ?? '';
-
-  if (Platform.isAndroid) {
-    return 'Mozilla/5.0 (Android; Mobile; ${locale})';
-  } else if (Platform.isIOS) {
-    return 'Mozilla/5.0 (iPhone; U; CPU iPhone OS like Mac OS X; ${locale})';
-  } else if (Platform.isMacOS) {
-    return 'Mozilla/5.0 (Macintosh; Intel Mac OS X; Macintosh; ${locale})';
-  } else if (Platform.isWindows) {
-    return 'Mozilla/5.0 (Windows; Windows; Windows; ${locale})';
-  } else if (Platform.isLinux) {
-    return 'Mozilla/5.0 (Linux; Linux; Linux; ${locale})';
-  } else {
-    // Dart/1.8.0 (macos; macos; macos; en_US)
-    String os = Platform.operatingSystem;
-    return "Dart/${getDartVersion()} (${os}; ${os}; ${os}; ${locale})";
-  }
-}
-
-String userHomeDir() {
+String _userHomeDir() {
   String envKey = Platform.operatingSystem == 'windows' ? 'APPDATA' : 'HOME';
   String value = Platform.environment[envKey];
   return value == null ? '.' : value;
 }
 
-String getDartVersion() {
+String _dartVersion() {
   String ver = Platform.version;
   int index = ver.indexOf(' ');
   if (index != -1) ver = ver.substring(0, index);
   return ver;
 }
 
 class IOPostHandler extends PostHandler {
   final String _userAgent;
   final HttpClient mockClient;
 
-  HttpClient _client;
+  IOPostHandler({HttpClient this.mockClient}) : _userAgent = _createUserAgent();
 
-  IOPostHandler({this.mockClient}) : _userAgent = _createUserAgent();
+  Future sendPost(String url, Map<String, dynamic> parameters) {
+    // Add custom parameters for OS and the Dart version.
+    parameters['cd1'] = Platform.operatingSystem;
+    parameters['cd2'] = 'dart ${_dartVersion()}';
 
-  @override
-  Future sendPost(String url, Map<String, dynamic> parameters) async {
     String data = postEncode(parameters);
 
-    if (_client == null) {
-      _client = mockClient != null ? mockClient : new HttpClient();
-      _client.userAgent = _userAgent;
-    }
-
-    try {
-      HttpClientRequest req = await _client.postUrl(Uri.parse(url));
+    HttpClient client = mockClient != null ? mockClient : new HttpClient();
+    client.userAgent = _userAgent;
+    return client.postUrl(Uri.parse(url)).then((HttpClientRequest req) {
       req.write(data);
-      HttpClientResponse response = await req.close();
+      return req.close();
+    }).then((HttpClientResponse response) {
       response.drain();
-    } catch (exception) {
+    }).catchError((e) {
       // Catch errors that can happen during a request, but that we can't do
-      // anything about, e.g. a missing internet connection.
-    }
+      // anything about, e.g. a missing internet conenction.
+    });
   }
-
-  @override
-  void close() => _client?.close();
 }
 
-JsonEncoder _jsonEncoder = new JsonEncoder.withIndent('  ');
-
 class IOPersistentProperties extends PersistentProperties {
   File _file;
   Map _map;
 
-  IOPersistentProperties(String name, {String documentDirPath}) : super(name) {
+  IOPersistentProperties(String name) : super(name) {
     String fileName = '.${name.replaceAll(' ', '_')}';
-    documentDirPath ??= userHomeDir();
-    _file = new File(path.join(documentDirPath, fileName));
-    if (!_file.existsSync()) {
-      _file.createSync();
-    }
-    syncSettings();
+    _file = new File(path.join(_userHomeDir(), fileName));
+    _file.createSync();
+    String contents = _file.readAsStringSync();
+    if (contents.isEmpty) contents = '{}';
+    _map = JSON.decode(contents);
   }
 
-  IOPersistentProperties.fromFile(File file) : super(path.basename(file.path)) {
-    _file = file;
-    if (!_file.existsSync()) {
-      _file.createSync();
-    }
-    syncSettings();
-  }
+  dynamic operator[](String key) => _map[key];
 
-  @override
-  dynamic operator [](String key) => _map[key];
-
-  @override
-  void operator []=(String key, dynamic value) {
-    if (value == null && !_map.containsKey(key)) return;
-    if (_map[key] == value) return;
-
+  void operator[]=(String key, dynamic value) {
     if (value == null) {
       _map.remove(key);
     } else {
       _map[key] = value;
     }
 
-    try {
-      _file.writeAsStringSync(_jsonEncoder.convert(_map) + '\n');
-    } catch (_) {}
-  }
-
-  @override
-  void syncSettings() {
-    try {
-      String contents = _file.readAsStringSync();
-      if (contents.isEmpty) contents = '{}';
-      _map = JSON.decode(contents);
-    } catch (_) {
-      _map = {};
-    }
+    _file.writeAsStringSync(JSON.encode(_map) + '\n');
   }
 }
-
-/// Return the string for the platform's locale; return's `null` if the locale
-/// can't be determined.
-String getPlatformLocale() {
-  String locale = Platform.localeName;
-  if (locale == null) return null;
-
-  if (locale != null) {
-    // Convert `en_US.UTF-8` to `en_US`.
-    int index = locale.indexOf('.');
-    if (index != -1) locale = locale.substring(0, index);
-
-    // Convert `en_US` to `en-us`.
-    locale = locale.replaceAll('_', '-').toLowerCase();
-  }
-
-  return locale;
-}