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']

ankisyncd/sync_app.py

@@ -42,7 +42,6 @@ from anki.consts import REM_CARD, REM_NOTE
 from ankisyncd.users import SimpleUserManager, SqliteUserManager
 
 
-
 class SyncCollectionHandler(anki.sync.Syncer):
     operations = ['meta', 'applyChanges', 'start', 'applyGraves', 'chunk', 'applyChunk', 'sanityCheck2', 'finish']
 
@@ -755,15 +754,14 @@ def make_app(global_conf, **local_conf):
 def main():
     from wsgiref.simple_server import make_server
     from ankisyncd.thread import shutdown
+    import ankisyncd.config
     logging.basicConfig(level=logging.INFO)
 
-    if len(sys.argv) < 2:
-        print("usage: {} configfile".format(os.path.basename(sys.argv[0])), file=sys.stderr)
-        exit(1)
-
-    parser = ConfigParser()
-    parser.read(sys.argv[1])
-    config = parser['sync_app']
+    if len(sys.argv) > 1:
+        # backwards compat
+        config = ankisyncd.config.load(sys.argv[1])
+    else:
+        config = ankisyncd.config.load()
 
     ankiserver = SyncApp(config)
     httpd = make_server(config['host'], int(config['port']), ankiserver)