Re: [PATCH/alternative/raw and rough] setup.c: denote repo wide pathspecs by ':'

> HEAD:path is repo wide already
>
> :path is also, after this patch
>
> Note that when you have a file named :foo now, it can already be
> mistaken as the blob at "foo" in the index (or HEAD) already, in places
> where rev:path makes sense. So you would need quotation before my patch.

>> Another, less cryptic choice, is to make these special notations
>> separate from true pathspecs. For example, instead of ":foo" we can
>> say "--root foo". get_pathspec() and friends can be updated to remove
>> --root and rewrite the next pathspec. Extensibility is obvious.
>
> Only that some commands have "--root" as an option, and even if not,
> it's just too much to type.

>> Back to what I'm writing above, '-' may be chosen over ':' even
>> without separation because UNIXers are trained that '-' is usually the
>> beginning of something special, I suppose most of us would go with
>> ./-blah for file names.
>
> If ":" is crazy which is in line with our current notation, then how do
> you call "-"? "-" is
>
> - a short option identifier
> - a negation (attributes)
> - a notation for stdin