Use predefined config locations

ankisyncd/config.py

@@ -0,0 +1,29 @@
+import configparser
+import logging
+import os.path
+
+
+def location():
+    dirname = os.path.dirname
+    realpath = os.path.realpath
+    choices = [
+        "/etc/ankisyncd/ankisyncd.conf",
+        os.environ.get("XDG_CONFIG_DIR") and
+            (os.path.join(os.environ['XDG_CONFIG_DIR'], "ankisyncd", "ankisyncd.conf")) or
+            os.path.join(os.path.expanduser("~"), ".config", "ankisyncd", "ankisyncd.conf"),
+        os.path.join(dirname(dirname(realpath(__file__))), "ankisyncd.conf"),
+    ]
+    for path in choices:
+        logging.debug("config.location: trying", path)
+        if os.path.isfile(path):
+            logging.debug("config.location: choosing", path)
+            return path
+
+    logging.error("No config found, looked in", ", ".join(choices))
+
+
+def load(path=location()):
+    logging.info("Loading config from {}".format(path))
+    parser = configparser.ConfigParser()
+    parser.read(path)
+    return parser['sync_app']