Make -c and -f mutually exlusive

Also removes dead code since --color and --no-color are ensured by argparse
to be mutually exclusive.

Move --version to the end of the command line params in -h

gpustat/cli.py

@@ -81,9 +81,10 @@ def main(*argv):
     parser.add_argument('-a', '--show-all', action='store_true',
                         help='Display all gpu properties above')
 
-    parser.add_argument('-c', '--show-cmd', action='store_true',
+    parser_cmd = parser.add_mutually_exclusive_group()
+    parser_cmd.add_argument('-c', '--show-cmd', action='store_true',
                         help='Display cmd name of running process')
-    parser.add_argument(
+    parser_cmd.add_argument(
         '-f', '--show-full-cmd', action='store_true',
         help='Display full command and cpu stats of running process'
     )
@@ -93,10 +94,6 @@ def main(*argv):
                         help='Display PID of running process')
     parser.add_argument('-F', '--show-fan-speed', '--show-fan',
                         action='store_true', help='Display GPU fan speed')
-    parser.add_argument('--json', action='store_true', default=False,
-                        help='Print all the information in JSON format')
-    parser.add_argument('-v', '--version', action='version',
-                        version=('gpustat %s' % __version__))
     parser.add_argument(
         '-e', '--show-codec', nargs='?', const='enc,dec',
         choices=['enc', 'dec', 'enc,dec'],
@@ -107,6 +104,8 @@ def main(*argv):
         choices=['', 'draw', 'limit', 'draw,limit', 'limit,draw'],
         help='Show GPU power usage or draw (and/or limit)'
     )
+    parser.add_argument('--json', action='store_true', default=False,
+                        help='Print all the information in JSON format')
     parser.add_argument(
         '-i', '--interval', '--watch', nargs='?', type=float, default=0,
         help='Use watch mode if given; seconds to wait between updates'
@@ -123,6 +122,8 @@ def main(*argv):
         '--debug', action='store_true', default=False,
         help='Allow to print additional informations for debugging.'
     )
+    parser.add_argument('-v', '--version', action='version',
+                        version=('gpustat %s' % __version__))
     args = parser.parse_args(argv[1:])
     if args.show_all:
         args.show_cmd = True

gpustat/core.py

@@ -548,10 +548,6 @@ def print_formatted(self, fp=sys.stdout, force_color=False, no_color=False,
                         eol_char=os.linesep,
                         ):
         # ANSI color configuration
-        if force_color and no_color:
-            raise ValueError("--color and --no_color can't"
-                             " be used at the same time")
-
         if force_color:
             t_color = Terminal(force_styling=True)