class Pronto::Github

def pull
  @pull ||= if env_pull_id
              @github_pull.pull_by_id(env_pull_id)
            elsif @repo.branch
              @github_pull.pull_by_branch(@repo.branch)
            elsif @repo.head_detached?
              @github_pull.pull_by_commit(@repo.head_commit_sha)
            end
end