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Re: "git shortlog -sn --follow -- <path>" counts all commits to entire repo

On Fri, Sep 08, 2017 at 03:38:17PM +0900, Junio C Hamano wrote:

> > I suspect a better solution might involve actually building on
> > log-tree.c to do the traversal (since this internal traversal is
> > supposed to be equivalent to "git log | git shortlog").
> Probably.  That approach would also have an added benefit that when
> "--follow" is fixed to keep track of which path it is following per
> traversal for "git log", the result from "git shortlog --follow"
> would automatically become correct, I guess?

Yeah. It depends on exactly how such a fix is made. I think one
improvement would be to actually bump --follow handling into the
limit_list() stage, so that we properly handle history simplification
over followed paths. In which case get_revision() would just never
return the uninteresting commits, and the current shortlog code would
Just Work.

That said, I don't think we can go wrong by making shortlog's traversal
more like log's. Any changes we make to --follow will be aimed at and
tested with git-log, so the more code they share the more likely it is
that shortlog won't bitrot.