Support loading different config files from the command line

Closes #84. Logs, PID files, and relay DBs will name themselves differently for every instance, to prevent conflicts. The default is always config.yml.

.gitignore

@@ -1,4 +1,4 @@
-config.yml
+*.yml
 build/
 __pycache__/
 *.py[cod]
@@ -6,4 +6,4 @@ __pycache__/
 *~
 *.save*
 *.db
-pylink.pid
+*.pid

conf.py

@@ -1,5 +1,19 @@
 import yaml
+import sys
 
-with open("config.yml", 'r') as f:
+global confname
+try:
+    # Get the config name from the command line, falling back to config.yml
+    # if not given.
+    fname = sys.argv[1]
+    confname = fname.split('.', 1)[0]
+except IndexError:
+    # confname is used for logging and PID writing, so that each
+    # instance uses its own files. fname is the actual name of the file
+    # we load.
+    confname = 'pylink'
+    fname = 'config.yml'
+
+with open(fname, 'r') as f:
     global conf
     conf = yaml.load(f)

log.py

@@ -2,7 +2,7 @@ import logging
 import sys
 import os
 
-from conf import conf
+from conf import conf, confname
 
 level = conf['bot'].get('loglevel') or 'DEBUG'
 try:
@@ -21,7 +21,7 @@ logging.basicConfig(level=level, format=_format)
 
 # Set log file to $CURDIR/log/pylink
 logformat = logging.Formatter(_format)
-logfile = logging.FileHandler(os.path.join(logdir, 'pylink.log'), mode='w')
+logfile = logging.FileHandler(os.path.join(logdir, '%s.log' % confname), mode='w')
 logfile.setFormatter(logformat)
 
 global log

main.py

@@ -205,7 +205,7 @@ if __name__ == '__main__':
     protocols_folder = [os.path.join(os.getcwd(), 'protocols')]
 
     # Write a PID file.
-    with open('pylink.pid', 'w') as f:
+    with open('%s.pid' % conf.confname, 'w') as f:
         f.write(str(os.getpid()))
 
     # Import plugins first globally, because they can listen for events

plugins/relay.py

@@ -10,8 +10,12 @@ from collections import defaultdict
 
 import utils
 from log import log
+from conf import confname
 
-dbname = "pylinkrelay.db"
+dbname = "pylinkrelay"
+if confname != 'pylink':
+    dbname += '-%s' % confname
+dbname += '.db'
 relayusers = defaultdict(dict)
 
 def relayWhoisHandlers(irc, target):