Re: [RFC/PATCH] grep --no-index: allow to grep without git exclusions

Bert Wesarg [off-list ref] writes:

It should be. But I think that unveils one of the shortcomings of the
(any) option parser: You wont get notified when an option was given,
regardless of its value. To handle the above I would have to use
OPTION_CALLBACK to set an addition flag exc_given (like it is done in
git-ls-files) and test against this.

Prepare a three-value variable, initialized to -1, set it to 0 on --no-foo
and set it to 1 on --foo. Use the default if the variable is still -1.