Git [submodules] are encoded as commits when walking a Git tree. To
allow the support of them in `radicle-surf`, the tree entry is checked
for this case. The entry will be treated such that it is has a name,
prefix, Oid, and the submodule's URL.
It's important to note that the Oid is not usable within the context
of the repository that is being browsed, since they are entirely
separate.
Instead, the URL should be used in conjunction with the Oid for
browsing purposes outside of `radicle-surf`. However, in a future
iteration it may be considered to be able to browse the local contents
of the submodule, if possible.
N.b. getting the submodule and its URL is not supported for a bare
repository, since it will complain about not having a working tree.
[submodules]: https://git-scm.com/book/en/v2/Git-Tools-Submodules
Signed-off-by: Fintan Halpenny <fintan.halpenny@gmail.com>
X-Clacks-Overhead: GNU Terry Pratchett
