// Munge is the workhorse the will actually make updates to the PR
func (h AssignUnassignHandler) Munge(obj *github.MungeObject) {
	if !obj.IsPR() {
		return
	}

	comments, err := obj.ListComments()
	if err != nil {
		glog.Errorf("unexpected error getting comments: %v", err)
		return
	}

	fileList, err := obj.ListFiles()
	if err != nil {
		glog.Errorf("Could not list the files for PR %v: %v", obj.Issue.Number, err)
		return
	}

	//get ALL (not just leaf) the people that could potentially own the file based on the blunderbuss.go implementation
	potentialOwners, _ := getPotentialOwners(*obj.Issue.User.Login, h.features, fileList, false)

	toAssign, toUnassign := h.getAssigneesAndUnassignees(obj, comments, fileList, potentialOwners)
	for _, username := range toAssign.List() {
		obj.AssignPR(username)
	}
	obj.UnassignPR(toUnassign.List()...)
}