bug#36644: Git log search

[Dmitry Gutov]

Hi Juri,

On 14.07.2019 1:27, Juri Linkov wrote:
> It would be very useful to have the command to grep git logs,
> for instance, to search commits by bug numbers in format "bug#36789"
> and many other such use cases:

I like the idea.

> +;; - log-search (pattern)
> +;;
> +;;   Search for PATTERN in the revision log.

Is pattern a regexp or a verbatim string? That should be documented. Git 
supports regexps, but maybe we should look at what other backends can 
support as well.

I wonder if the format of the output should be specified as well. E.g. 
by saying that it's the same as for print-log, long version.

> +(defun vc-git-log-search (buffer pattern)
> +  (vc-setup-buffer buffer)
> +  (vc-git-command
> +   buffer 'async nil
> +   "log"
> +   "--no-color" "-i" (format "--grep=%s" pattern)))

Should this use shell-quote-argument?