Re: How to undo previously set configuration? (again)

[Barret Rhoden <brho@google.com>]

Hi -

On 4/25/19 10:36 AM, Jonathan Nieder wrote:
> Hi,
> 
> Ævar Arnfjörð Bjarmason wrote:
> 
>> Because we don't have some general config facility for this it keeps
>> coming up, and various existing/proposed options have their own little
>> custom hacks for doing it, e.g. this for Barret Rhoden's proposed "blame
>> skip commits" feature
>> https://public-inbox.org/git/878swhfzxb.fsf@evledraar.gmail.com/
>> (b.t.w. I*meant*  /dev/null in that E-Mail, but due to PEBCAK wrote
>> /dev/zero).
> I'm confused.  Isn't that bog-standard Git usage, not a custom hack?
> That is, I thought the intended behavior is always
> 
>   1. For single-valued options, last value wins.
>   2. For multi-valued options, empty clears the list.
>   3. When there is a special behavior triggered by not supplying the
>      option at all, offer an explicit value like "default" that triggers
>      the same behavior, too.
> 
> and that any instance of a command that isn't following that is a bug.

Not sure if it's meant to be the standard, but I just went with the 
style used by credential.helper.  This was suggested to me by Johannes 
in [1]:

On 2019-01-18 at 10:47 Johannes Schindelin <Johannes.Schindelin@gmx.de>
wrote:
> A better idea IMHO would be to use an OPT_STRING_LIST() for
> `--ignore-revs-file`, too, and to allow for multiple
> `blame.ignoreRevsFile` config entries (with our usual trick of handling an
> empty setting by resetting the list of paths that were accumulated so
> far, see e.g. how `credential.helper` is handled).

[1] 
https://public-inbox.org/git/nycvar.QRO.7.76.6.1901181038540.41@tvgsbejvaqbjf.bet/

Barret