open Sexplib.Std

type merge_strategy = PreferLeft | PreferRight | RevertToAncestor
[@@deriving sexp]

type statement =
  | CreateBranch of { name: string; hash: string option [@sexp.option] }
  | Checkout of string
  | GetHead
  | GetBranchTip of string
  | UpdateBranchTip of { name: string; hash: string }
  | Merge of { left: string; right: string; strategy: merge_strategy }
[@@deriving sexp]