1 files changed, 95 insertions, 0 deletions
diff --git a/lib/kDL.ml b/lib/kDL.ml
new file mode 100644
index 0000000..550c26f
--- /dev/null
+++ b/lib/kDL.ml
@@ -0,0 +1,95 @@
+(*─────────────────────────────────────────────────────────────────────────────┐
+│ SPDX-FileCopyrightText: 2025 toastal <https://toast.al/contact/>             │
+│ SPDX-License-Identifier: LGPL-2.1-or-later WITH OCaml-LGPL-linking-exception │
+└─────────────────────────────────────────────────────────────────────────────*)
+(* extend & fix casing for ocaml-kdl *)
+include Kdl
+
+let of_flow flow =
+	try
+		Eio.Buf_read.parse_exn
+			(fun buf -> Eio.Buf_read.take_all buf |> Kdl.of_string)
+			~max_size: max_int
+			flow
+	with
+		| exn -> failwith (Printexc.to_string exn)
+
+let to_flow flow doc =
+	Eio.Buf_write.with_flow flow @@ fun buf ->
+	let out_string s off len =
+		String.sub s off len |> Eio.Buf_write.string buf
+	in
+	let flush () = () in
+	let ppf = Format.make_formatter out_string flush in
+
+	(* replace spaces with tabs for indentation *)
+	let base_fmt = Format.pp_get_formatter_out_functions ppf () in
+	let tabbed_fmt = {base_fmt with
+		out_indent = (fun n -> base_fmt.out_string (String.make n '\t') 0 n)
+	}
+	in
+	Format.pp_set_formatter_out_functions ppf tabbed_fmt;
+
+	(* enable utf-8 and pretty-print *)
+	Fmt.set_utf_8 ppf true;
+	pp ppf doc;
+	Format.pp_print_flush ppf ()
+
+module L = KDL_lens_result
+
+module Valid = struct
+	type err = [
+		| L.lerr
+		| `ParseError of Kdl.error
+		| `OneRequired of string list
+		| `OnlyOneOf of string list
+		| `InvalidLatestCmd of string
+		| `InvalidHashAlgorithm of string
+	]
+	[@@deriving show]
+	type 'a t = ('a, err list) result
+	let pp ~(ok : 'a Fmt.t) : 'a t Fmt.t =
+		Fmt.result ~ok ~error: (Fmt.list pp_err)
+	let map = Result.map
+	let map1 (f : 'a -> 'b) (vx : ('a, err) result) : 'b t =
+		match vx with
+		| Ok x -> Ok (f x)
+		| Error e -> Error [e]
+	let map_error = Result.map_error
+	let pure x = Ok x
+	let and_map (vx : 'a t) (vf : ('a -> 'b) t) =
+		match vx, vf with
+		| Ok x, Ok f -> Ok (f x)
+		| Error e, Ok _ -> Error e
+		| Ok _, Error e -> Error e
+		| Error e1, Error e2 -> Error (e2 @ e1)
+	let product (vx : 'a t) (vy : 'b t) =
+		match vx, vy with
+		| Ok x, Ok y -> Ok (x, y)
+		| Error e, Ok _ -> Error e
+		| Ok _, Error e -> Error e
+		| Error e1, Error e2 -> Error (e2 @ e1)
+	let and_map1 (vx : ('a, err) result) (vf : ('a -> 'b) t) =
+		match vx, vf with
+		| Ok x, Ok f -> Ok (f x)
+		| Error e, Ok _ -> Error [e]
+		| Ok _, Error e -> Error e
+		| Error e1, Error e2 -> Error (e2 @ [e1])
+	let bind = Result.bind
+	let lift_lens (r : ('a, L.lerr) result) : ('a, err list) result =
+		Result.map_error (fun e -> ([e] :> err list)) r
+	let ll = lift_lens
+	let (let+) vx f = map f vx
+	let (and+) = product
+	let (let*) = bind
+end
+
+type 'a codec = {
+	to_kdl: 'a -> t;
+	of_kdl: t -> 'a Valid.t
+}
+
+type 'a node_codec = {
+	to_node: 'a -> node;
+	of_node: node -> 'a Valid.t
+}