lib: Begin a settings file

Right now I just have functions for set and get wrapped in a context
manager for splitting the setting string into section and key values.

Signed-off-by: Anna Schumaker <Anna@NoWheyCreamery.com>

lib/__init__.py

@@ -1,2 +1,3 @@
 # Copyright 2020 (c) Anna Schumaker.
 from . import publisher
+from . import settings

lib/settings.py

@@ -0,0 +1,23 @@
+# Copyright 2021 (c) Anna Schumaker.
+import configparser
+
+config = configparser.ConfigParser()
+
+class Prepare:
+    def __init__(self, setting):
+        self.setting = setting
+    def __enter__(self):
+        return self.setting.split(".")
+    def __exit__(self, exp_type, exp_value, traceback):
+        return exp_type == None
+
+
+def get(setting, default=None):
+    with Prepare(setting) as (section, key):
+        return config.get(section, key, fallback=default)
+
+def set(setting, value):
+    with Prepare(setting) as (section, key):
+        if not config.has_section(section):
+            config.add_section(section)
+        config.set(section, key, str(value))

lib/test_settings.py

@@ -0,0 +1,17 @@
+# Copyright 2021 (c) Anna Schumaker.
+from . import settings
+import unittest
+import configparser
+
+class TestSettings(unittest.TestCase):
+    def test_init(self):
+        self.assertIsInstance(settings.config, configparser.ConfigParser)
+
+    def test_set_get(self):
+        self.assertIsNone(settings.get("test.key"))
+
+        settings.set("test.key", 42)
+        self.assertEqual(settings.get("test.key"), "42")
+        self.assertIsNone(settings.get("test.nokey"))
+        self.assertEqual(settings.get("test.nokey", 1), 1)
+        self.assertEqual(settings.get("no.key", 1), 1)