Manually implement show and pp for Node types.

Author: zoj613

lib/node.ml

@@ -12,7 +12,6 @@ module GroupNode = struct
   type t =
     | Root
     | Cons of t * string
-    [@@deriving show]
 
   let create parent name =
     if rep_ok name then
@@ -87,14 +86,16 @@ module GroupNode = struct
     | _, Root -> false
     | v, Cons (parent, _) -> parent = v
 
-  let show n = to_path n
+  let show = to_path
+
+  let pp fmt t =
+    Format.fprintf fmt "%s" @@ show t
 end
 
 module ArrayNode = struct
   type t =
     {parent : GroupNode.t
     ;name :  string}
-    [@@deriving show]
 
   let create parent name =
     if rep_ok name then
@@ -145,4 +146,7 @@ module ArrayNode = struct
   let to_metakey p = to_key p ^ "/zarr.json"
 
   let show = to_path
+
+  let pp fmt t =
+    Format.fprintf fmt "%s" @@ show t
 end

test/test_node.ml

@@ -129,7 +129,7 @@ let array_node = [
   let s = "/some/dir/moredirs/path/pname" in
   let n = ArrayNode.of_path s |> Result.get_ok in
   assert_equal "pname" @@ ArrayNode.name n;
-  assert_equal ~printer:Fun.id s @@ ArrayNode.to_path n;
+  assert_equal ~printer:Fun.id s @@ ArrayNode.show n;
 
   (* parent tests *)
   assert_equal
@@ -138,8 +138,10 @@ let array_node = [
     ArrayNode.parent (ArrayNode.of_path "/nodename" |> Result.get_ok);
 
   (* equality tests *)
+  let n' = (ArrayNode.of_path s |> Result.get_ok) in
   assert_equal
-    true @@ ArrayNode.(n = (ArrayNode.of_path s |> Result.get_ok));
+    ~printer:ArrayNode.show n n';
+  assert_equal true ArrayNode.(n = n');
   assert_equal
     false @@
     ArrayNode.(n = Result.get_ok @@ ArrayNode.of_path (s ^ "/more"));