Produce sparse_paths_type option for sparse checkouts to designate "cone" or "no-cone"

[paulhovey]

I believe this should resolve #360 and #363 . It exposes a sparse_paths_type which will pass --cone or --no-cone` to git.

It also updates the regex package, as mentioned in #363 .

I'm open to any feedback on this, I'm just someone with the same issue and access to GLM-5.2 🙂

[jacebrowning]

@paulhovey thanks for the PR! I'd really like to see a solution here doesn't require a new field for such a specific usage. Can the need for "cone" be inferred at all? Would always passing --no-cone work for the majority of cases? Please discuss further on the issues if needed.

I'll pull the regex upgrade into another PR.

[paulhovey]

Hi Jace, understood about not wanting to introduce a new config option, but I'm not sure a better way off the top of my head. Using --no-cone is not recommended, so I think staying with the default is what gitman should be doing: https://git-scm.com/docs/git-sparse-checkout#_internalsnon_cone_problems

However, some people may have a specific reason for needing --no-cone, and this would enable them. I'll think on this a little more, but an extra toggle might be the only way to do this, since I don't think it can be strictly inferred.

Thanks for pulling the regex into a separate PR!