Support overriding the default negated name of a boolean flag.

[wibling]

It would be great to be able to use the args package in contexts where the naming convetion for negated flags are different which requires overriding the default negated flag name (--no-).

This could e.g. be done by adding an optional negatedName parameter to the addFlag method.

[seaneagan]

Could you give an example? Is it still a prefix, or does it replace the whole name?

[wibling]

I was thinking it should just replace the entire negated name.

Something like

parser.addFlag('fast', negatedName: 'slow')

which results in the --slow flags being the opposite of the --fast which in some cases are better than the default --no-fast. This would also allow changing the prefix, by e.g.

parser.addFlag('foo', negatedName: 'nofoo');

giving --nofoo instead of --no-foo.

[wibling]

I just took a look at the code and the way it is structured today seems like it would be much simpler to support a new prefix that overriding the full name.

Solving the second use case above by supporting a new negated prefix would be great too. Completely overriding negated flag names could come as an additional improvement later.