On Tue, Aug 14, 2018 at 1:01 PM Jeff King <p...@peff.net> wrote: > > On Tue, Aug 14, 2018 at 10:28:13AM -0700, Matthew DeVore wrote: > > > The name "tree:0" allows later filtering based on depth, i.e. "tree:1" > > would filter out all but the root tree and blobs. In order to avoid > > confusion between 0 and capital O, the documentation was worded in a > > somewhat round-about way that also hints at this future improvement to > > the feature. > > I'm OK with this as a name, since we're explicitly not supporting deeper > depths. But I'd note that "depth" is actually a tricky characteristic, > as it's not a property of the object itself, but rather who refers to > it. So: > > - it's expensive to compute, because you have to actually walk all of > the possible commits and trees that could refer to it. This > prohibits a lot of other optimizations like reachability bitmaps > (though with some complexity you could cache the depths, too). I think what the user likely wants is to use the minimum depth based on the commits in the traversal, not every commit in the repo - is this what you mean?
> > - you have to define it as something like "the minimum depth at which > this object is found", since there may be multiple depths > > I think you can read that second definition between the lines of: > > > +The form '--filter=tree:<depth>' omits all blobs and trees deeper than > > +<depth> from the root tree. Currently, only <depth>=0 is supported. > > But I wonder if we should be more precise. It doesn't matter now, but it > may help set expectations if the feature does come later. > Makes sense. I changed it like this - diff --git a/Documentation/rev-list-options.txt b/Documentation/rev-list-options.txt index 0b5f77ad3..5f1672913 100644 --- a/Documentation/rev-list-options.txt +++ b/Documentation/rev-list-options.txt @@ -732,8 +732,10 @@ the requested refs. The form '--filter=sparse:path=<path>' similarly uses a sparse-checkout specification contained in <path>. + -The form '--filter=tree:<depth>' omits all blobs and trees deeper than -<depth> from the root tree. Currently, only <depth>=0 is supported. +The form '--filter=tree:<depth>' omits all blobs and trees whose depth +from the root tree is >= <depth> (minimum depth if an object is located +at multiple depths in the commits traversed). Currently, only <depth>=0 +is supported, which omits all blobs and trees. --no-filter:: Turn off any previous `--filter=` argument. > -Peff
