From 5c7a43091596b35ae620ec454569fc0a34ab1f1d Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Fran=C3=A7ois=20Schmidts?= <francois.schmidts@gmail.com>
Date: Sun, 22 Oct 2017 21:57:54 +0200
Subject: [PATCH] adding test, fixing config export

---
 tests/test_the_conf.py | 23 +++++++++++++++++++++++
 the_conf/node.py       |  3 +++
 the_conf/the_conf.py   | 27 +++++++++++++++------------
 3 files changed, 41 insertions(+), 12 deletions(-)

diff --git a/tests/test_the_conf.py b/tests/test_the_conf.py
index ce36c83..8f581b4 100644
--- a/tests/test_the_conf.py
+++ b/tests/test_the_conf.py
@@ -40,6 +40,19 @@ def test_conf_from_obj(self):
         tc.option = 1
         self.assertEqual('1', tc.option)
 
+    def test_casting(self):
+        metaconf = {'parameters': [
+                        {'option1': {'type': str, 'default': 'a'}},
+                        {'option2': {'type': int, 'default': '1'}},
+                    ],
+                    'config_files': []}
+        tc = TheConf(metaconf, cmd_line_opts=[])
+        self.assertEqual('a', tc.option1)
+        self.assertEqual(1, tc.option2)
+        tc.option1, tc.option2 = 'b', '2'
+        self.assertEqual('b', tc.option1)
+        self.assertEqual(2, tc.option2)
+
     def test_trigger_error_w_required(self):
         metaconf = {'parameters': [
                         {'option': {'type': str, 'required': True}}],
@@ -48,3 +61,13 @@ def test_trigger_error_w_required(self):
                 TheConf, metaconf, cmd_line_opts=[])
         tc = TheConf(metaconf, cmd_line_opts=['--option=stuff'])
         self.assertEqual('stuff', tc.option)
+
+    def test_extract_config(self):
+        metaconf = {'parameters': [{'option': [
+                        {'option': {'type': str, 'default': 'a'}}]}],
+                    'config_files': []}
+        tc = TheConf(metaconf, cmd_line_opts=[])
+        self.assertEqual('a', tc.option.option)
+        self.assertEqual({}, tc.extract_config())
+        tc.option.option = 'b'
+        self.assertEqual({'option': {'option': 'b'}}, tc.extract_config())
diff --git a/the_conf/node.py b/the_conf/node.py
index fa5229f..69d6c85 100644
--- a/the_conf/node.py
+++ b/the_conf/node.py
@@ -61,6 +61,9 @@ def _load_parameter(self, name, settings):
         if has_default and settings['required']:
             raise ValueError(
                     "%r required parameter can't have default value" % path)
+
+        if 'type' in settings and 'default' in settings:
+            settings['default'] = settings['type'](settings['default'])
         self._parameters[name] = settings
 
     def _set_to_path(self, path, value, overwrite=False):
diff --git a/the_conf/the_conf.py b/the_conf/the_conf.py
index ce0f969..59a2c1d 100644
--- a/the_conf/the_conf.py
+++ b/the_conf/the_conf.py
@@ -71,20 +71,23 @@ def load(self):
                 raise ValueError('loading finished and %r is not set'
                         % '.'.join(path))
 
-    def write(self, config_file=None):
-        if config_file is None and not self._config_files:
-            raise ValueError('no config file to write in')
+    def extract_config(self):
         config = {}
         for paths, value, param in self._get_path_val_param():
             if value is node.NoValue:
                 continue
+            if 'default' in param and value == param['default']:
+                continue
             curr_config = config
-            for path in paths:
-                if path != paths[-1]:
-                    if path not in curr_config:
-                        curr_config[path] = {}
-                        curr_config = curr_config[path]
-                else:
-                    curr_config[path] = value
-
-        files.write(config, config_file or self._config_files[0])
+            for path in paths[:-1]:
+                curr_config[path] = {}
+                curr_config = curr_config[path]
+            curr_config[paths[-1]] = value
+        return config
+
+    def write(self, config_file=None):
+        if config_file is None and not self._config_files:
+            raise ValueError('no config file to write in')
+
+        files.write(self.extract_config(),
+                config_file or self._config_files[0])