Re: tools for easily "uncommitting" parts of a patch I just commited?

[Junio C Hamano <gitster@pobox.com>]

Jeff King <peff@peff.net> writes:

>> I still think it's worth while to add a check for git-commit which
>> does something like check when we say "git commit <files>" and if the
>> index already has those files marked as being changed, compare them
>> with the current contents of the file as in the checkout and quick
>> saying "please don't do that" so as to avoid the problem in the first
>> place.
> ...
> I suspect both of those would complain about legitimate workflows.
>
> I dunno.  I do not ever use "git commit <file>" myself.

Users are different.  I do use this all the time, and it is not
unusual at all to have changed contents on paths other than <file>
already added to the index when I do so, i.e. an unrelated small
typofix in <file> jumping ahead of the real changes I am working on
in other parts of the tree.

"Please don't do that" would break.  Jacob says "avoid the problem",
but I do not see a problem in allowing it (it could be that the
problem Jacob has is in other parts of his workflow, but I do not
know what it is offhand).