Change documentation and add configfile argument

Configuration options are from previous commit documented directly in
example configuration file. So they don't have to be documented in
readme.

New argument configfile was added because if user uses default paths
for configuration files, it can be sometime unclear what file was used.
This prints path to used file.
Also as small feature, if no identifier is specified as argument neither
in configuration file help text is printed.

1 files changed, 18 insertions, 0 deletions

diff --git a/mcwrapper b/mcwrapper
index 8b0c253..ddf1d8d 100755
--- a/mcwrapper
+++ b/mcwrapper
@@ -324,16 +324,26 @@ def print_help():
     print('       Decrease verbose level of output.')
     print('   --config CONFIG_FILE')
     print('       Specify configuration file to be used.')
+    print('   --configfile')
+    print('       prints used configuration file and exits.')
     print(' IDENTIFIER')
     print('   Identifier for new server. This allows multiple servers running with this')
     print('   wrapper.  Identifier is word without spaces and preferably without special')
     print('   characters.')
     sys.exit(_EC_OK)
 
+def print_conffile():
+    if '__file__' in vars(conf):
+        print(conf.__file__)
+    else:
+        print("No configuration file used.")
+    sys.exit(_EC_OK)
+
 if __name__ == '__main__':
     identifier = None
     use_config = None
     verbose_level = 0
+    print_config_file = False
     i = 1
     while i < len(sys.argv):
         arg = sys.argv[i]
@@ -353,6 +363,8 @@ if __name__ == '__main__':
                     else:
                         use_config = sys.argv[i]
                         i += 1
+                elif arg == '--configfile':
+                    print_config_file = True
                 continue
             else:
                 for l in arg[1:]:
@@ -372,10 +384,16 @@ if __name__ == '__main__':
     # Parsing args ends
 
     load_conf(use_config)
+
+    if print_config_file:
+        print_conffile()
+
     conf.verbose_level += verbose_level
     # Set identifier if provided
     if identifier:
         conf.identifier = identifier
+    elif not "identifier" in vars(conf):
+        print_help()
 
     signal.signal(signal.SIGTERM, __signal_term__)
     signal.signal(signal.SIGINT, __signal_term__)