Re: Detect all changes in a buffer

[raman <raman@google.com>]

Karl Fogel <kfogel@red-bean.com> writes:

there was also an effort based around erlang > Lars Tveito <larstvei@ifi.uio.no> writes:
>>I am developing a minor mode that enables real-time collaboration. I
>>wish to detect /all/ changes made to a buffer. So far I'm using
>>`before-change-functions' to detect deletions and
>>`after-change-functions' to detect insertions.
>
> You might already know about these, but just in case:
>
> There was some work on this in the past -- the effort I remember was based on a collaboration protocol called "Obby", but now that I look at https://www.emacswiki.org/emacs/CollaborativeEditing I see there were some other efforts as well.
>
> I don't know if anything there would save you time, but wanted to point it out just in case.
>
> (You raise a good question about `inhibit-modification-hooks', and I don't know the answer to it.)
>
> Best regards,
> -Karl
>
>>The problem is that some functions utilizes
>>`inhibit-modification-hooks', even though they make changes to the
>>buffer. An example is `eshell-send-input'.
>>
>>The first question is whether you have any suggestions as to how to get
>>around this? The second is whether it is considered OK for functions to
>>use this hook even though the function makes changes to the buffer? The
>>documentation for change hooks states "These hook variables let you
>>arrange to take notice of all changes in all buffers" which is not
>>really true if changes are done whilst `inhibit-modification-hooks' is
>>non-nil.
>>
>>- Lars
>

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