Neater Unity 2018 projects with git submodules and sparse checkout

addpackage.sh

# Usage
# addpackage [repo url] [package directory name] [Assets dirs to include]
# Example: ./addpackage.sh https://github.com/georgejecook/UnityTimelineEvents.git UnityTimelineEvents "TimelineEvents/*"

git clone --depth=1 --no-checkout $1 Packages/$2/repo
git submodule add $1 Packages/$2/repo
git -C Packages/$2/repo/ config core.sparseCheckout true
git submodule absorbgitdirs
echo Assets/$3 >> .git/modules/Packages/$2/repo/info/sparse-checkout
git submodule update --init --force --checkout Packages/$2/repo

package.json

{
  "name": "com.ixxy.unitytimelineevents",
  "displayName": "Unity Timeline Events",
  "version": "0.0.1",
  "unity": "2018.1",
  "description": "test",
  "dependencies": { }
}