splitpatch is a useful tool to break patch file to pieces. http://manpages.ubuntu.com/manpages/zesty/man1/splitpatch.1.html https://github.com/benjsc/splitpatch
It's quite similar to splitdiff from patchutils package. So necessity of splitpatch is questionable.
Which distributions provide it already? https://repology.org/metapackage/splitpatch/versions
@jstein: For new packages, please put the HOMEPAGE in the URL field and put the short description in the Summary. Thanks.