RE: grep-command: Ignore case if case-fold-search is non-nil

[Tino Calancha <tino.calancha@gmail.com>]

On Sun, 18 Sep 2016, Drew Adams wrote:

>>> Just because you might want to search the current buffer
>>> case-(in)sensitively, that in no way implies that you want to
>>> search a set of files somewhere the same way.
>>>
>>> `grep' is an external command.  It is not about acting (e.g.,
>>> searching) buffers within Emacs.
>> Ok, let me change my question.
>>
>> Should `grep' family of commands in Emacs pass '-i' as default,
>> regardless of the `case-fold-search' value in current buffer,
>> if the user didn't customize `grep-command'?
>
> That's a better question.  I don't see why it should, but
> it's a fair question.
>
> The real point, I think, is that users can get their
> preferred default behavior by customizing `grep-command'.
> What the default value of that option is, is a secondary
> consideration.  What's the argument for changing to -i
> for the default?
After Eli answers, i agree is not good idea changing a long
standing default value.  I actually customize `grep-command' to
do what i like to do, and i keep it case insensitive.
My only concern now i that `rgrep', `lgrep' follow case-fold-search
but `grep-find' do not.  It's a minor thing, though.