bug#25277: 24.5; Allow predicate, not just Boolean value, for `global-auto-revert-ignore-buffer'

[Lars Ingebrigtsen]

Drew Adams <drew.adams@oracle.com> writes:

> Enhancement request.  Provide an easy way to specify a predicate that
> inhibits (or activates) auto-revert for a given buffer.
>
> See this question, for example:
> http://emacs.stackexchange.com/q/29591/105
>
> I provided this answer, but it might be helpful if Emacs provided a
> variable whose value is a predicate that determines whether the current
> buffer can be auto-reverted.  Emacs provides a variable,
> `global-auto-revert-ignore-buffer', to test for auto-reversion.  In
> addition or instead, it could provide a predicate-valued variable.
>
> Simpler, perhaps, is to let the value of
> `global-auto-revert-ignore-buffer' be, alternatively, a predicate, which
> is called when the buffer is set up (e.g. `after-file-hook', for a file
> buffer).  The return value would be handled just like the current value
> of `global-auto-revert-ignore-buffer' is handled now.

I think that makes sense.  What parameter(s) would the predicate take?
The buffer or the file name... or both?  Hm...  Looking at the code
where `global-auto-revert-ignore-buffer' is consulted, we're in the
correct buffer, but it may not have a file name, so I guess the buffer
should be the parameter?

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