Re: [PATCH 4/4] Implement git commit and status as a builtin commands.

> Note though, that Kristian had a similar check at the end of his email,
> that included "only" (but lacked the bool conversion). The original
> reason why I thought that it would be better was that for example
> "git commit --all --only foo" didn't care about "only" at all. But that
> actually was because the --all + paths usage check was broken. So the
> fixed version actually refuses to use accept that, but with a (IMHO) not
> so good error message:
> 
> $ git commit -a -o file
> Paths with -a does not make sense.
> 
> Given that some people are used to just pass -a all the time, they might
> just automatically pass it together with -o. And I think that we
> actually want to tell them that -a + -o makes no sense instead. Just
> like we do for -a + -i, which is kind of the complementary usage error.
> 
> So I'd go for a correct version of Kristian's suggestion:
> 
> if (!!also + !!only + !!all + !!interactive > 1)
> 	die("Only one of --include/--only/--all/--interactive can be used.");