feat dart: mv basePath to ApiClient

Changing the basePath is pretty annoying otherwise, because
you would need to set the basePath for every Api.

Author: d3v-cl

modules/swagger-codegen/src/main/resources/dart/api.mustache

@@ -4,7 +4,6 @@ part of api;
 
 
 class {{classname}} {
-  String basePath = "{{basePath}}";
   final ApiClient apiClient;
 
   {{classname}}([ApiClient apiClient]) : apiClient = apiClient ?? defaultApiClient;
@@ -73,8 +72,7 @@ class {{classname}} {
       {{/formParams}}
     }
 
-    var response = await apiClient.invokeAPI(basePath,
-                                             path,
+    var response = await apiClient.invokeAPI(path,
                                              '{{httpMethod}}',
                                              queryParams,
                                              postBody,

modules/swagger-codegen/src/main/resources/dart/api_client.mustache

@@ -9,6 +9,7 @@ class QueryParam {
 
 class ApiClient {
 
+  String basePath;
   var client = new {{#browserClient}}Browser{{/browserClient}}Client();
 
   Map<String, String> _defaultHeaderMap = {};
@@ -20,7 +21,7 @@ class ApiClient {
   final _RegList = new RegExp(r'^List<(.*)>$');
   final _RegMap = new RegExp(r'^Map<String,(.*)>$');
 
-  ApiClient() {
+  ApiClient({this.basePath: "{{{basePath}}}"}) {
     // Setup authentications (key: authentication name, value: authentication).{{#authMethods}}{{#isBasic}}
     _authentications['{{name}}'] = new HttpBasicAuth();{{/isBasic}}{{#isApiKey}}
     _authentications['{{name}}'] = new ApiKeyAuth({{#isKeyInHeader}}"header"{{/isKeyInHeader}}{{^isKeyInHeader}}"query"{{/isKeyInHeader}}, "{{keyParamName}}");{{/isApiKey}}{{#isOAuth}}
@@ -113,8 +114,7 @@ class ApiClient {
 
   // We don't use a Map<String, String> for queryParams.
   // If collectionFormat is 'multi' a key might appear multiple times.
-  Future<Response> invokeAPI(String host,
-                             String path,
+  Future<Response> invokeAPI(String path,
                              String method,
                              List<QueryParam> queryParams,
                              Object body,
@@ -130,7 +130,7 @@ class ApiClient {
                          '?' + ps.join('&') :
                          '';
 
-    String url = host + path + queryString;
+    String url = basePath + path + queryString;
 
     headerParams.addAll(_defaultHeaderMap);
     headerParams['Content-Type'] = contentType;