feat(Logger): debugging interface

src/Logger.ml

@@ -0,0 +1,22 @@
+include LoggerSigs
+
+type 'a Effect.t +=
+  | Debug : Diagnostic.loctext -> unit Effect.t
+  | CallBegin : Diagnostic.loctext -> unit Effect.t
+  | CallEnd : Diagnostic.loctext -> unit Effect.t
+
+let debug_loctext t = Effect.perform @@ Debug t
+let debug ?loc s = debug_loctext @@ Diagnostic.loctext ?loc s
+let debugf ?loc = Diagnostic.kloctextf ?loc debug_loctext
+
+let stalk_open_loctext t = Effect.perform @@ CallBegin t
+let stalk_close_loctext t = Effect.perform @@ CallEnd t
+let stalk ?loc s f =
+  stalk_open_loctext (Diagnostic.loctext ?loc s);
+  Fun.protect f
+    ~finally:(fun () -> stalk_close_loctext (Diagnostic.loctext ?loc s))
+let stalkf ?loc =
+  Diagnostic.ktextf @@ fun t f ->
+  stalk_open_loctext {Range.value = t; loc};
+  Fun.protect f
+    ~finally:(fun () -> stalk_close_loctext {Range.value = t; loc})

src/Logger.mli

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+include module type of LoggerSigs
+
+module Make () : S

src/LoggerSigs.ml

@@ -0,0 +1,7 @@
+module type S =
+sig
+  val debug : ?loc:Range.t -> string -> unit
+  val debugf : ?loc:Range.t -> ('a, Format.formatter, unit, unit) format4 -> 'a
+  val stalk : ?loc:Range.t -> string -> (unit -> 'a) -> 'a
+  val stalkf : ?loc:Range.t -> ('b, Format.formatter, unit, (unit -> 'a) -> 'a) format4 -> 'b
+end