From 1d51ab954726cb478325cba0046fedd7d931b8b3 Mon Sep 17 00:00:00 2001
From: Andy Lu <andy@stitchdata.com>
Date: Tue, 13 Nov 2018 19:52:06 +0000
Subject: [PATCH 1/2] Add key property to function call, clean up whitespace

---
 README.md | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/README.md b/README.md
index 7c064f7..7073a57 100644
--- a/README.md
+++ b/README.md
@@ -29,9 +29,10 @@ library:
 import singer
 
 singer.write_schema('my_table',
-                {'properties':{'id': {'type': 'string', 'key': True}}})
+	            {'properties':{'id': {'type': 'string', 'key': True}}},
+		    ['id'])
 singer.write_records('my_table',
-                 [{'id': 'b'}, {'id':'d'}])
+                     [{'id': 'b'}, {'id':'d'}])
 singer.write_state({'my_table': 'd'})
 ```
 

From f3715e2f8c1caa3c5e0d62762d2a24c33b6f1f2d Mon Sep 17 00:00:00 2001
From: Andy Lu <andy@stitchdata.com>
Date: Fri, 16 Nov 2018 19:33:46 +0000
Subject: [PATCH 2/2] Add update_config_file() and unittest

---
 singer/utils.py     |  3 +++
 tests/test_utils.py | 21 ++++++++++++++++++++-
 2 files changed, 23 insertions(+), 1 deletion(-)

diff --git a/singer/utils.py b/singer/utils.py
index 4cd179d..3efdccf 100644
--- a/singer/utils.py
+++ b/singer/utils.py
@@ -185,6 +185,9 @@ def check_config(config, required_keys):
     if missing_keys:
         raise Exception("Config is missing required keys: {}".format(missing_keys))
 
+def update_config_file(config_path, new_config):
+    with open(config_path, 'w') as output:
+        output.write(json.dumps(new_config, indent=2))
 
 def backoff(exceptions, giveup):
     """Decorates a function to retry up to 5 times using an exponential backoff
diff --git a/tests/test_utils.py b/tests/test_utils.py
index bb26da6..0783510 100644
--- a/tests/test_utils.py
+++ b/tests/test_utils.py
@@ -3,7 +3,7 @@
 import pytz
 import logging
 import singer.utils as u
-
+import json
 
 class TestFormat(unittest.TestCase):
     def test_small_years(self):
@@ -33,3 +33,22 @@ def test_exception_fn(self):
         def foo():
             raise RuntimeError("foo")
         self.assertRaises(RuntimeError, foo)
+
+class TestUpdateConfig(unittest.TestCase):
+    def test_file_changed(self):
+        original_config = {'key_a': 'val_a'}
+
+        with open('config.json', 'w') as file:
+            file.write(json.dumps(original_config))
+
+        changed_config = {'key_b': 'val_b'}
+
+        u.update_config_file('config.json', changed_config)
+
+        read_config = u.load_json('config.json')
+
+        self.assertEqual(changed_config.get('key_b'), read_config.get('key_b'))
+
+    def tearDown(self):
+        import os
+        os.remove('config.json')