Re: Thoughts on support for vc-diff unsaved buffer contents?

[Campbell Barton <ideasman42@gmail.com>]

On 24-11-22 6:44 PM, Juri Linkov wrote:
>> Hi, recently I've run into a situation where it's necessary to calculate
>> modified line ranges without first saving the buffer (where "modified" is
>> determined by a version control diff).
>>
>> I'm curious if this is something that might be supported - or, is already
>> supported (although I'm fairly sure it's not).
> 
> 'diff-no-select' as well as 'multi-file-diff-no-select' accept
> unsaved buffers as their arguments.

Thanks for the suggestion.

The part I'm not sure about regarding `diff-no-select' & 
`diff-buffer-with-file' is how they could work with version-control 
(vc-diff or a related functions).

As far as I can see the diff needs to be generated by version-control 
(git/hg/svn etc) instead of a file - since the "original" file 
necessarily exist as a file on disk.