Re: vc-region-history: HG?

["Óscar Fuentes" <ofv@wanadoo.es>]

Richard Copley <rcopley@gmail.com> writes:

> On 16 January 2018 at 18:41, Óscar Fuentes <ofv@wanadoo.es> wrote:
>> Uwe Brauer <oub@mat.ucm.es> writes:
>>
>>> But, what is the underlying git command? I tried to debug the function
>>> and couldn't figure it out.
>
> Uwe,
>
> To see the backend command, set 'vc-command-messages' to t
> before issuing a VC command in Emacs.
>
> For vc-command history the messages logged are:
>
> Running git --no-pager diff-index --exit-code -p HEAD  -- Makefile.in
> in foreground...
> Running git --no-pager diff-index --exit-code -p HEAD  -- Makefile.in...OK = 0
> Running git --no-pager log -p -L... . in background... done
>
> In this case I'm not sure that tells the whole story and I expect Emacs does
> some of the work. I didn't put much effort into understanding the output but
> perhaps it will give you a useful hint.
>
>> From vc-git-region-history:
>>
>> (vc-git-command buffer 'async nil "log" "-p" ;"--follow" ;FIXME: not supported?
>>                 (format "-L%d,%d:%s" lfrom lto (file-relative-name file)))
>>
>>
>> lfrom and lto are line numbers.

In case it is not clear, the command is

git log -p -L10,20:foo.c

for printing the history of lines 10 to 20 of file foo.c