Add log level config option

* Log levels can now be set via the command line and the configuration
  file.
* ServerConfig.load() function takes a file-like object now, rather than
  a string

Signed-off-by: Alek Ratzloff <alekratz@gmail.com>

omnibot/__main__.py

@@ -1,20 +1,40 @@
+import argparse
 import asyncio
 import logging
 
 from .config import ServerConfig
 from .bot import Bot
 
+parser = argparse.ArgumentParser(description="Run an IRC bot")
+parser.add_argument(
+    "-c", "--config", type=argparse.FileType("r"), default="config.toml"
+)
+parser.add_argument(
+    "--loglevel",
+    type=str,
+    choices=["DEBUG", "INFO", "WARNING", "ERROR", "CRITICAL"],
+    required=False,
+)
+args = parser.parse_args()
+
+config = ServerConfig()
+config.load(args.config)
+
+# Set log level now
+loglevel = logging.INFO
+if args.loglevel:
+    loglevel = getattr(logging, args.loglevel)
+elif config.loglevel:
+    loglevel = getattr(logging, config.loglevel)
+
 logging.basicConfig(
-    level=logging.INFO,
+    level=loglevel,
     format="%(asctime)s - %(name)-12s - %(levelname)-8s - %(message)s",
 )
 log = logging.getLogger(__name__)
 
-log.debug("Loading config")
-config = ServerConfig()
-config.load("config.toml")
+log.info("Loaded config file %s", args.config)
 log.debug("Using configuration: %s", config)
-
 bot = Bot(config)
 
 try: