Allow exporting for .ini config files

kaptan/handlers/ini_handler.py

@@ -22,6 +22,8 @@
 
 
 class KaptanIniParser(configparser.RawConfigParser):
+    def from_dict(self, dictionary):
+        self._sections = dictionary
 
     def as_dict(self):
         d = dict(self._sections)
@@ -39,5 +41,10 @@ def load(self, value):
         config.read_file(StringIO(value))
         return config.as_dict()
 
-    def dump(self, file_):
-        raise NotImplementedError("Exporting .ini files is not supported.")
+    def dump(self, data, file_=None):
+        if file_ is None:
+            raise NotImplementedError("Exporting .ini as string is not supported.")
+        config = KaptanIniParser()
+        config.from_dict(data)
+        with open(file_, 'w') as fp:
+            config.write(fp)

tests/test_kaptan.py

@@ -220,6 +220,30 @@ def test_ini_file_handler(tmpdir, testconfig):
     ) == 'mysql://poor_user:poor_password@localhost/poor_posts'
 
 
+def test_ini_file_dump(tmpdir):
+    testdict = {
+        "development": {
+            "DATABASE_URI": "mysql://root:123456@localhost/posts"
+        },
+        "production": {
+            "DATABASE_URI": "mysql://poor_user:poor_password@localhost/poor_posts"  # NOQA
+        }
+    }
+
+    config = kaptan.Kaptan()
+    config.import_config(testdict)
+
+    ini_file = tmpdir.join('config.ini')
+    config.export('ini', file_=str(ini_file))
+
+    ini_config = kaptan.Kaptan(handler='ini')
+    ini_config.import_config(str(ini_file))
+
+    assert ini_config.get(
+        'production.database_uri'
+    ) == 'mysql://poor_user:poor_password@localhost/poor_posts'
+
+
 def test_py_file_handler(testconfig, tmpdir, monkeypatch):
     py_file = tmpdir.join('config.py')
     py_file.write("""DATABASE = 'mysql://root:123456@localhost/girlz'