(******************************************************************************)
(* OASIS: architecture for building OCaml libraries and applications          *)
(*                                                                            *)
(* Copyright (C) 2011-2016, Sylvain Le Gall                                   *)
(* Copyright (C) 2008-2011, OCamlCore SARL                                    *)
(*                                                                            *)
(* This library is free software; you can redistribute it and/or modify it    *)
(* under the terms of the GNU Lesser General Public License as published by   *)
(* the Free Software Foundation; either version 2.1 of the License, or (at    *)
(* your option) any later version, with the OCaml static compilation          *)
(* exception.                                                                 *)
(*                                                                            *)
(* This library is distributed in the hope that it will be useful, but        *)
(* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY *)
(* or FITNESS FOR A PARTICULAR PURPOSE. See the file COPYING for more         *)
(* details.                                                                   *)
(*                                                                            *)
(* You should have received a copy of the GNU Lesser General Public License   *)
(* along with this library; if not, write to the Free Software Foundation,    *)
(* Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA              *)
(******************************************************************************)


(** Generate standard development files
    @author Sylvain Le Gall
*)


open OASISFileTemplate
open OASISGettext
open OASISTypes
open OASISPlugin
open OASISSchema


let plugin = `Extra, "DevFiles", Some OASISConf.version_short


let self_id, all_id =
  Extra.create plugin


let all_targets =
  [
    "build";
    "doc";
    "test";
    "all";
    "install";
    "uninstall";
    "reinstall";
    "clean";
    "distclean";
    "configure";
  ]


type t =
  {
    makefile_notargets: string list;
    enable_makefile:    bool;
    enable_configure:   bool;
  }


let pivot_data =
  data_new_property plugin


let generator =
  let makefile_notargets =
    new_field
      OASISPackage.schema
      all_id
      "MakefileNoTargets"
      ~default:[]
      (OASISValues.comma_separated
         (OASISValues.choices
            (fun _ -> s_ "target")
            (List.rev_map (fun s -> s, s) all_targets)))
      (fun () ->
         s_ "Targets to disable when generating Makefile")
      pivot_data (fun _ t -> t.makefile_notargets)
  in

  let enable_makefile =
    new_field
      OASISPackage.schema
      all_id
      "EnableMakefile"
      ~default:true
      OASISValues.boolean
      (fun () ->
         s_ "Generate Makefile")
      pivot_data (fun _ t -> t.enable_makefile)
  in

  let enable_configure =
    new_field
      OASISPackage.schema
      all_id
      "EnableConfigure"
      ~default:true
      OASISValues.boolean
      (fun () ->
         s_ "Generate configure script")
      pivot_data (fun _ t -> t.enable_configure)
  in

  (fun data ->
     {
       makefile_notargets = makefile_notargets data;
       enable_makefile    = enable_makefile data;
       enable_configure   = enable_configure data;
     })


let main ctxt pkg =
  let t =
    generator pkg.schema_data
  in
  let (makefile_setup_deps, packages) =
    match ctxt.update with
      | OASISSetupUpdate.Dynamic -> (" _oasis", " -linkpkg -package oasis.dynrun")
      | OASISSetupUpdate.Weak -> (" _oasis", "")
      | OASISSetupUpdate.NoUpdate -> ("", "")
  in
  let compiled_setup_ml =
    OASISFeatures.package_test OASISFeatures.compiled_setup_ml pkg
  in
  if compiled_setup_ml && not t.enable_makefile then
    OASISMessage.error
      ~ctxt:ctxt.ctxt
      "The alpha feature compiled_setup_ml doesn't work without a Makefile if \
       DevFiles in enabled";
  let ctxt =
    (* Generate Makefile (for standard dev. env.) *)
    if t.enable_makefile then
      begin
        let buff =
          Buffer.create 13
        in
        let targets =
          let excludes =
            OASISUtils.SetString.of_list t.makefile_notargets
          in
          List.filter
            (fun t -> not (OASISUtils.SetString.mem t excludes))
            all_targets
        in
        let add_one_target ?(need_configure=true) ?(other_depends=[]) nm =
          let setup_deps l = if compiled_setup_ml then "$(SETUP)" :: l else l in
          let deps =
            String.concat " "
              ((if need_configure then
                  (fun l -> "setup.data" :: setup_deps l)
                else
                  (fun l -> setup_deps l))
                 other_depends)
          in
          let deps = if deps <> "" then " " ^ deps else deps in
          Printf.bprintf buff
            "%s:%s\n\
             \t$(SETUP) -%s $(%sFLAGS)\n\n"
            nm
            deps
            nm (OASISString.uppercase_ascii nm)
        in
        Buffer.add_string
          buff
          (if compiled_setup_ml then
             "\nSETUP = ./setup.exe\n\n"
           else
             "\nSETUP = ocaml setup.ml\n\n"
          );
        List.iter
          (function
            | "distclean" when compiled_setup_ml ->
              Printf.bprintf buff
                "distclean: $(SETUP)\n\
                 \t$(SETUP) -distclean $(DISTCLEANFLAGS)\n\
                 \t$(RM) $(SETUP)\n\n";
            | "all" | "clean" | "distclean" as nm ->
              add_one_target ~need_configure:false nm
            | "test" | "doc" as nm ->
              add_one_target ~other_depends:["build"] nm
            | "configure" ->
              let add_configure_target nm =
                Printf.bprintf buff
                  "%s:%s\n\
                   \t$(SETUP) -configure $(CONFIGUREFLAGS)\n\n"
                  nm
                  (if compiled_setup_ml then " $(SETUP)" else "");
              in
              add_configure_target "setup.data";
              add_configure_target "configure";
            | nm ->
              add_one_target nm)
          targets;
        if compiled_setup_ml then begin
          Printf.bprintf buff
            "setup.exe: setup.ml%s\n\
             \tocamlfind ocamlopt -o $@%s setup.ml || ocamlfind ocamlc -o $@%s setup.ml || true\n\
             \t$(RM) setup.cmi setup.cmo setup.cmx setup.o\n\n"
            makefile_setup_deps packages packages;
        end;
        Buffer.add_string buff (".PHONY: "^(String.concat " " targets)^"\n");

        OASISPlugin.add_file
          {(template_make "Makefile" comment_sh []
              (OASISString.split_newline ~do_trim:false
                 (Buffer.contents buff)) []) with
             important = true}
          ctxt
      end
    else
      ctxt
  in

  let ctxt =
    (* Generate configure (for standard dev. env.) *)
    if t.enable_configure then
      let ocaml_setup_configure =
        let cmd =
          if compiled_setup_ml then
            Printf.sprintf
              "if [ ! -e setup.exe ] || [ _oasis -nt setup.exe ] || [ setup.ml -nt setup.exe ] || [ configure -nt setup.exe ]; then\n  \
               ocamlfind ocamlopt -o setup.exe%s setup.ml || ocamlfind ocamlc -o setup.exe%s setup.ml || exit 1\n  \
               rm -f setup.cmi setup.cmo setup.cmx setup.o\n\
               fi\n\
               ./setup.exe -configure \"$@\""
              packages packages
          else
            "ocaml setup.ml -configure \"$@\""
        in
        [""; cmd; "# OASIS_STOP"]
      in
      begin
        let tmpl =
          template_of_string_list
            ~ctxt:ctxt.OASISPlugin.ctxt
            ~template:true
            "configure"
            comment_sh
            (DevFilesData.configure @ ocaml_setup_configure)
        in
        OASISPlugin.add_file
          {tmpl with perm = 0o755; important = true}
          ctxt
      end
    else
      ctxt
  in

  ctxt


let init () =
  Extra.register_act self_id main;
  register_help
    plugin
    {(help_default DevFilesData.readme_template_mkd) with
       help_order = 60};
  register_generator_package all_id pivot_data generator
