Source file `show.ml`

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(*******************************************************************************)
(*  Volgo - a Versatile OCaml Library for Git Operations                       *)
(*  Copyright (C) 2024-2025 Mathieu Barbin <mathieu.barbin@gmail.com>          *)
(*                                                                             *)
(*  This file is part of Volgo.                                                *)
(*                                                                             *)
(*  Volgo is free software; you can redistribute it and/or modify it under     *)
(*  the terms of the GNU Lesser General Public License as published by the     *)
(*  Free Software Foundation either version 3 of the License, or any later     *)
(*  version, with the LGPL-3.0 Linking Exception.                              *)
(*                                                                             *)
(*  Volgo is distributed in the hope that it will be useful, but WITHOUT ANY   *)
(*  WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS  *)
(*  FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License and    *)
(*  the file `NOTICE.md` at the root of this repository for more details.      *)
(*                                                                             *)
(*  You should have received a copy of the GNU Lesser General Public License   *)
(*  and the LGPL-3.0 Linking Exception along with this library. If not, see    *)
(*  <http://www.gnu.org/licenses/> and <https://spdx.org>, respectively.       *)
(*******************************************************************************)

open! Import

let interpret_output (output : Vcs.Git.Output.t) =
  Vcs.Git.Result.exit_code output ~accept:[ 0, `Present; 128, `Absent ]
  |> Result.map ~f:(function
    | `Present -> `Present (Vcs.File_contents.create output.stdout)
    | `Absent -> `Absent)
;;

module Make (Runtime : Runtime.S) = struct
  type t = Runtime.t

  let show_file_at_rev t ~repo_root ~rev ~path =
    Runtime.git
      t
      ~cwd:(repo_root |> Vcs.Repo_root.to_absolute_path)
      ~args:
        [ "show"
        ; Printf.sprintf
            "%s:%s"
            (rev |> Vcs.Rev.to_string)
            (path |> Vcs.Path_in_repo.to_string)
        ]
      ~f:interpret_output
  ;;
end