Change Meta.load to return the simplified meta

It's always simplified anyway

src/findlib.ml

@@ -99,11 +99,7 @@ module Config = struct
     if not (Path.exists conf_file) then
       die "@{<error>Error@}: ocamlfind toolchain %s isn't defined in %a \
            (context: %s)" toolchain Path.pp path context;
-    let vars =
-      (Meta.simplify { name = ""
-                     ; entries = Meta.load (Path.to_string conf_file)
-                     }).vars
-    in
+    let vars = (Meta.load ~name:"" ~fn:(Path.to_string conf_file)).vars in
     { vars = String_map.map vars ~f:Rules.of_meta_rules
     ; preds = Ps.make [toolchain]
     }
@@ -167,7 +163,7 @@ end
 type t =
   { stdlib_dir : Path.t
   ; path       : Path.t list
-  ; builtins   : Meta.t String_map.t
+  ; builtins   : Meta.Simplified.t String_map.t
   ; packages   : (string, (Package.t, Unavailable_reason.t) result) Hashtbl.t
   }
 
@@ -233,7 +229,7 @@ let parse_package t ~meta_file ~name ~parent_dir ~vars =
 
 (* Parse all the packages defined in a META file and add them to
    [t.packages] *)
-let parse_and_acknowledge_meta t ~dir ~meta_file (meta : Meta.t) =
+let parse_and_acknowledge_meta t ~dir ~meta_file (meta : Meta.Simplified.t) =
   let rec loop ~dir ~full_name (meta : Meta.Simplified.t) =
     let vars = String_map.map meta.vars ~f:Rules.of_meta_rules in
     let dir, res =
@@ -243,13 +239,13 @@ let parse_and_acknowledge_meta t ~dir ~meta_file (meta : Meta.t) =
     List.iter meta.subs ~f:(fun (meta : Meta.Simplified.t) ->
       loop ~dir ~full_name:(sprintf "%s.%s" full_name meta.name) meta)
   in
-  loop ~dir ~full_name:meta.name (Meta.simplify meta)
+  loop ~dir ~full_name:meta.name meta
 
 (* Search for a <package>/META file in the findlib search path, parse
    it and add its contents to [t.packages] *)
 let find_and_acknowledge_meta t ~fq_name =
   let root_name = root_package_name fq_name in
-  let rec loop dirs : (Path.t * Path.t * Meta.t) option =
+  let rec loop dirs : (Path.t * Path.t * Meta.Simplified.t) option =
     match dirs with
     | dir :: dirs ->
       let sub_dir = Path.relative dir root_name in
@@ -257,18 +253,14 @@ let find_and_acknowledge_meta t ~fq_name =
       if Path.exists fn then
         Some (sub_dir,
               fn,
-              { name    = root_name
-              ; entries = Meta.load (Path.to_string fn)
-              })
+              Meta.load ~name:root_name ~fn:(Path.to_string fn))
       else
         (* Alternative layout *)
         let fn = Path.relative dir ("META." ^ root_name) in
         if Path.exists fn then
           Some (dir,
                 fn,
-                { name    = root_name
-                ; entries = Meta.load (Path.to_string fn)
-                })
+                Meta.load ~fn:(Path.to_string fn) ~name:root_name)
         else
           loop dirs
     | [] ->

src/import.ml

@@ -11,7 +11,14 @@ let ksprintf = Printf.ksprintf
 let initial_cwd = Sys.getcwd ()
 
 module String_set = Set.Make(String)
-module String_map = Map.Make(String)
+module String_map = struct
+  include Map.Make(String)
+
+  let pp f fmt t =
+    Format.pp_print_list (fun fmt (k, v) ->
+      Format.fprintf fmt "@[<hov 2>(%s@ =@ %a)@]" k f v
+    ) fmt (to_list t)
+end
 
 module Int_set = Set.Make(Int)
 module Int_map = Map.Make(Int)

src/meta.ml

@@ -102,10 +102,6 @@ module Parse = struct
       error lb "'package' or variable name expected"
 end
 
-let load fn =
-  Io.with_lexbuf_from_file fn ~f:(fun lb ->
-      Parse.entries lb 0 [])
-
 module Simplified = struct
   module Rules = struct
     type t =
@@ -145,6 +141,14 @@ let rec simplify t =
         in
         { pkg with vars = String_map.add pkg.vars rule.var rules })
 
+let load ~fn ~name =
+  { name
+  ; entries =
+      Io.with_lexbuf_from_file fn ~f:(fun lb ->
+        Parse.entries lb 0 [])
+  }
+  |> simplify
+
 let rule var predicates action value =
   Rule { var; predicates; action; value }
 let requires ?(preds=[]) pkgs =
@@ -225,7 +229,7 @@ let builtins ~stdlib_dir =
     else
       [ compiler_libs; str; unix; bigarray; threads ]
   in
-  List.map libs ~f:(fun t -> t.name, t)
+  List.map libs ~f:(fun t -> t.name, simplify t)
   |> String_map.of_list_exn
 
 let string_of_action = function

src/meta.mli

@@ -25,8 +25,6 @@ and predicate =
   | Pos of string
   | Neg of string
 
-val load : string -> entry list
-
 module Simplified : sig
   module Rules : sig
     type t =
@@ -42,10 +40,10 @@ module Simplified : sig
     }
 end
 
-val simplify : t -> Simplified.t
+val load : fn:string -> name:string -> Simplified.t
 
 (** Builtin META files for libraries distributed with the compiler. For when ocamlfind is
     not installed. *)
-val builtins : stdlib_dir:Path.t -> t String_map.t
+val builtins : stdlib_dir:Path.t -> Simplified.t String_map.t
 
 val pp : Format.formatter -> entry list -> unit

test/unit-tests/tests.mlt

@@ -10,6 +10,7 @@ let print_pkg ppf pkg =
 ;;
 
 #install_printer print_pkg;;
+#install_printer String_map.pp;;
 
 [%%expect{|
 val print_pkg : Format.formatter -> Jbuilder.Findlib.Package.t -> unit =
@@ -50,16 +51,19 @@ Findlib.Package.requires pkg;;
 open Meta
 
 let meta =
-  { name = "foo"
-  ; entries = Meta.load "test/unit-tests/findlib-db/foo/META"
-  }
+  Meta.load ~name:"foo" ~fn:"test/unit-tests/findlib-db/foo/META"
 
 [%%expect{|
-val meta : Jbuilder.Meta.t =
-  {name = "foo";
-   entries =
-    [Rule {var = "requires"; predicates = []; action = Set; value = "bar"};
-     Rule
-      {var = "requires"; predicates = [Pos "ppx_driver"]; action = Set;
-       value = "baz"}]}
+val meta : Jbuilder.Meta.Simplified.t =
+  {Jbuilder.Meta.Simplified.name = "foo";
+   vars =
+    (requires =
+      {Jbuilder.Meta.Simplified.Rules.set_rules =
+        [{Jbuilder__Meta.var = "requires"; predicates = [];
+          action = Jbuilder__Meta.Set; value = "bar"};
+         {Jbuilder__Meta.var = "requires";
+          predicates = [Jbuilder__Meta.Pos "ppx_driver"];
+          action = Jbuilder__Meta.Set; value = "baz"}];
+       add_rules = []});
+   subs = []}
 |}]