Add a (barely tested) pwgen command

sbws/__main__.py

 import sbws.commands.client
 import sbws.commands.generate
 import sbws.commands.init
+import sbws.commands.pwgen
 import sbws.commands.server
 import sbws.commands.stats
 from sbws.util.config import get_config
@@ -31,6 +32,7 @@ def create_parser():
     sbws.commands.client.gen_parser(sub)
     sbws.commands.generate.gen_parser(sub)
     sbws.commands.init.gen_parser(sub)
+    sbws.commands.pwgen.gen_parser(sub)
     sbws.commands.server.gen_parser(sub)
     sbws.commands.stats.gen_parser(sub)
     return p
@@ -81,6 +83,8 @@ def main():
                      'a': def_args, 'kw': def_kwargs},
         'init': {'f': sbws.commands.init.main,
                  'a': def_args, 'kw': def_kwargs},
+        'pwgen': {'f': sbws.commands.pwgen.main,
+                  'a': def_args, 'kw': def_kwargs},
         'server': {'f': sbws.commands.server.main,
                    'a': def_args, 'kw': def_kwargs},
         'stats': {'f': sbws.commands.stats.main,

sbws/commands/pwgen.py

+from argparse import ArgumentDefaultsHelpFormatter
+import random
+
+PW_LEN = 64
+ALPHABET = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789'
+
+
+def gen_parser(sub):
+    d = 'Generate a password suitable for use by a sbws client for '\
+        'authenticating to an sbws server.'
+    sub.add_parser('pwgen', formatter_class=ArgumentDefaultsHelpFormatter,
+                   description=d)
+
+
+def rand_char():
+    return random.choice(ALPHABET)
+
+
+def rand_str():
+    s = ''
+    while len(s) < PW_LEN:
+        s += rand_char()
+    return s
+
+
+def main(args, conf, log_):
+    global log
+    log = log_
+    s = rand_str()
+    print(s)