Re: [PATCH 6/7] parse_color: recognize "no$foo" to clear the $foo attribute

> You can turn on ANSI text attributes like "reverse" by
> putting "reverse" in your color spec. However, you cannot
> ask to turn reverse off.
>
> For common cases, this does not matter. You would turn on
> "reverse" at the start of a colored section, and then clear
> all attributes with a "reset". However, you may wish to turn
> on some attributes, then selectively disable others. For
> example:
>
>   git log --format="%C(bold ul yellow)%h%C(noul) %s"
>
> underlines just the hash, but without the need to re-specify
> the rest of the attributes. This can also help third-party
> programs, like contrib/diff-highlight, that want to turn
> some attribute on/off without disrupting existing coloring.
>
> Note that some attribute specifications are probably
> nonsensical (e.g., "bold nobold"). We do not bother to flag
> such constructs, and instead let the terminal sort it out.
>
> Signed-off-by: Jeff King <peff@peff.net>