class Pronto::Git::Repository

def diff(commit, options = nil)
  target, patches = case commit
                    when :unstaged, :index
                      [head_commit_sha, @repo.index.diff(options)]
                    when :staged
                      [head_commit_sha, head.diff(@repo.index, options)]
                    when :workdir
                      [
                        head_commit_sha,
                        @repo.diff_workdir(
                          head,
                          {
                            include_untracked: true,
                            include_untracked_content: true,
                            recurse_untracked_dirs: true
                          }.merge(options || {})
                        )
                      ]
                    else
                      merge_base = merge_base(commit)
                      patches = @repo.diff(merge_base, head, options)
                      [merge_base, patches]
                    end
  patches.find_similar!(renames: true)
  Patches.new(self, target, patches)
end