(* -*- tuareg -*- *)

(* Build a functorized version of the protocol with the
   `tezos-protocol-compiler` This is bit hackish...

   AFAIK the current version of jbuilder (1.0+beta16) does not allow
   to compile with a custom `rule` the `(modules)` of a library.

   A trick is to provide the `.cmx` through the `(library_flags)` and
   to generate a empty `.ml` to correctly handle the dependencies... *)

#require "unix"

let prefix = "proto_"
let dirname = Filename.basename @@ Filename.dirname @@ Sys.getcwd ()

let predefined_version = None (* to be substituted in opam packages *)

let version =
  match predefined_version with
  | Some version -> version
  | None ->
    let x = String.length prefix in
    let n = String.length dirname in
    if not (n >= x && String.sub dirname 0 x = prefix) then
      failwith "unexpected directory name" ;
    String.sub dirname x (n - x)

let path =
  match predefined_version with
  | None -> "src/proto_" ^ version ^ "/lib_protocol"
  | Some _ -> "."

let sources =
  let d = Unix.opendir "src" in
  let rec loop acc =
    match Unix.readdir d with
    | exception End_of_file ->
        Unix.closedir d ;
        acc
    | file ->
        let acc =
          if Filename.check_suffix file ".mli"
          || Filename.check_suffix file ".ml" then
            ("src/" ^ file) :: acc
          else
            acc
        in
        loop acc in
  loop []

module M = Unix

let () = Format.kasprintf Jbuild_plugin.V1.send {|

(jbuild_version 1)

(rule
 ((targets (tezos_protocol_%s.o
            tezos_protocol_%s.cmx
            tezos_protocol_%s.cmi
            tezos_protocol_%s_dummy.ml))
  (deps ((glob_files src/*.ml)
         (glob_files src/*.mli)
         src/TEZOS_PROTOCOL))
  (action (with-stdout-to ${path-no-dep:tezos_protocol_%s_dummy.ml}
           (chdir ${ROOT}
                  (run ${bin:tezos-protocol-compiler} -static ${path-no-dep:tezos_protocol_%s} ${path-no-dep:src}))))))

(library
 ((name tezos_protocol_%s)
  (public_name tezos-protocol-%s)
  (library_flags (:standard -linkall %s/tezos_protocol_%s.cmx))
  (flags (:standard -safe-string))
  (wrapped false)
  (modes (native))
  (modules (Tezos_protocol_%s_dummy))))

(install
  ((section lib)
   (files   ("tezos_protocol_%s.cmx" "tezos_protocol_%s.cmi"))
   (package tezos-protocol-%s)))

(alias
 ((name runtest_sandbox)
  (deps (tezos_protocol_%s.cmx))))

(alias
 ((name runtest_indent)
  (deps (@[<v>%a@]))
  (action (run bash ${libexec:tezos-stdlib:test-ocp-indent.sh} ${^}))))

|}
    version version version version version version version version
    path
    version version version version version version
    Format.(pp_print_list (fun ppf -> Format.fprintf ppf "%S"))
    sources