1 files changed, 47 insertions, 0 deletions
diff --git a/yarnutils/vars.py b/yarnutils/vars.py
new file mode 100644
index 0000000..9404ffa
--- /dev/null
+++ b/yarnutils/vars.py
@@ -0,0 +1,47 @@
+# Copyright 2017  Lars Wirzenius
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+#
+# =*= License: GPL-3+ =*=
+
+
+import os
+import yaml
+
+
+class Variables(object):
+
+    _basename = 'vars.yaml'
+
+    def __init__(self, dirname):
+        self._filename = os.path.join(dirname, self._basename)
+        self._dict = self._load()
+
+    def _load(self):
+        if os.path.exists(self._filename):
+            with open(self._filename) as f:
+                return yaml.safe_load(f)
+        else:
+            return {}
+
+    def _save(self, values):
+        with open(self._filename, 'w') as f:
+            return yaml.safe_dump(values, stream=f)
+
+    def __getitem__(self, key):
+        return self._dict.get(key)
+
+    def __setitem__(self, key, value):
+        self._dict[key] = value
+        self._save(self._dict)