better if-not-match

.jjconflict-side-0/src/data_file.ml

@@ -0,0 +1,35 @@
+open Bos.OS
+open Syntax
+open Crypto
+
+let read fname =
+  let* b = File.exists fname |> Syntax.unwrap_err_msg in
+  match b with
+  | false -> Ok None
+  | true ->
+      let+ content = File.read fname |> Syntax.unwrap_err_msg in
+      Some content
+
+let write_eddsa fname priv =
+  EddsaPrivateKey.to_octets priv |> File.write fname |> Syntax.unwrap_err_msg
+
+let write_rsa fname priv =
+  RsaPrivateKey.to_octets priv |> File.write fname |> Syntax.unwrap_err_msg
+
+let read_eddsa fname =
+  let* opt = read fname in
+  match opt with
+  | None -> Ok None
+  | Some data -> (
+      EddsaPrivateKey.of_octets data |> function
+      | Error e -> Error e
+      | Ok v -> Ok (Some v))
+
+let read_rsa fname =
+  let* opt = read fname in
+  match opt with
+  | None -> Ok None
+  | Some data -> (
+      RsaPrivateKey.of_octets data |> function
+      | Error e -> Error e
+      | Ok v -> Ok (Some v))