Github user ran-z commented on a diff in the pull request:

    https://github.com/apache/incubator-ariatosca/pull/107#discussion_r115935686
  
    --- Diff: aria/cli/core/aria.py ---
    @@ -65,15 +58,33 @@ def __init__(self, *args, **kwargs):
             super(MutuallyExclusiveOption, self).__init__(*args, **kwargs)
     
         def handle_parse_result(self, ctx, opts, args):
    -        if self.mutually_exclusive.intersection(opts) and self.name in 
opts:
    +        if (self.name in opts) and 
self.mutually_exclusive.keys().intersection(opts):
                 raise click.UsageError(
                     'Illegal usage: `{0}` is mutually exclusive with '
                     'arguments: [{1}] ({2}).'.format(
                         self.name,
                         self.mutuality_string,
                         self.mutuality_error_message))
    -        return super(MutuallyExclusiveOption, self).handle_parse_result(
    -            ctx, opts, args)
    +        return super(MutuallyExclusiveOption, 
self).handle_parse_result(ctx, opts, args)
    +
    +
    +def mutually_exclusive_option(*param_decls, **attrs):
    +    """
    +    Makes options mutually exclusive. The decorator must pass a a 
``mutually_exclusive`` argument
    +    with a list of argument names with which the option is mutually 
exclusive.
    +
    +    NOTE: All mutually exclusive options must use this. It's not enough to 
use it in just one of the
    +    options.
    +    """
    +    def decorator(func):
    +        if 'help' in attrs:
    --- End diff --
    
    could you please document this func a bit more?
    I'm not sure what are `param_decls` and `attrs` in this case, why `help` is 
being inspected, and why the internal `__click_params__` is accessed directly 
here.


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