On Wed, Aug 14, 2013 at 09:28:24AM +0200, Matthieu Moy wrote:
> Junio C Hamano <gitster@xxxxxxxxx> writes:
>
> > Jeff King <peff@xxxxxxxx> writes:
> >
> >> I guess we could do something like:
> >>
> >> [include "repo:...your regex here..."]
> >> path = .gitconfig-only-for-some-repos
> >> [include "env:USE_MY_MAGIC_CONFIG"]
> >> path = .gitconfig-only-when-magic-env-set
> >
> > I am not sure if "env" is very useful, but there certainly are other
> > possibilities (e.g. apply this only on this host, only for members
> > of this UNIX group, etc.)
>
> I have already wished I had "git version >= XXX" here (but that's tricky
> to implement).
I assume it is "because version XXX understands config option Y, but
older versions do not"[1]. Rather than ask for version XXX, then, you
could ask for
[include "option:Y"]
path = ...
and versions which understand Y (which happens to be XXX or greater)
would internally know that and consider the conditional true.
This whole discussion is basically implementing conditional config. In
my patch, the conditional is limited only to including other config. But
if you have many such conditions (and especially if each one only has
one varying config key), the result can be unwieldy. Another way of
doing this would be to introduce a conditional syntax to ignore or
respect some part of the file. The problem is that it would be tricky to
do in a backwards-compatible way.
-Peff
[1] I used to run into this with pager.*, which originally could only be
a bool, but later learned to take custom pagers. I solved it with:
git config --file .gitconfig-pager pager.diff ...
git config --global include.path .gitconfig-pager
which does not need a version or option conditional, because the
option was added _before_ the include feature. IOW, older versions
of git ignore it, and any which actually respect the include will
know how to handle custom pagers. But that does not work with
changes that came after the include feature was added. :)
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