[stm] Make toplevels standalone executables.

We turn coqtop "plugins" into standalone executables, which will be
installed in `COQBIN` and located using the standard `PATH`
mechanism. Using dynamic linking for `coqtop` customization didn't
make a lot of sense, given that only one of such "plugins" could be
loaded at a time. This cleans up some code and solves two problems:

- `coqtop` needing to locate plugins,
- dependency issues as plugins in `stm` depended on files in `toplevel`.

In order to implement this, we do some minor cleanup of the toplevel
API, making it functional, and implement uniform build rules. In
particular:

- `stm` and `toplevel` have become library-only directories,
- a new directory, `topbin`, contains the new executables,
- 4 new binaries have been introduced, for coqide and the stm.
- we provide a common and cleaned up way to locate toplevels.

5 files changed, 90 insertions, 0 deletions

diff --git a/topbin/coqproofworker_bin.ml b/topbin/coqproofworker_bin.ml
new file mode 100644
index 000000000..7ae91cfbd
--- /dev/null
+++ b/topbin/coqproofworker_bin.ml
@@ -0,0 +1,14 @@
+(************************************************************************)
+(*         *   The Coq Proof Assistant / The Coq Development Team       *)
+(*  v      *   INRIA, CNRS and contributors - Copyright 1999-2018       *)
+(* <O___,, *       (see CREDITS file for the list of authors)           *)
+(*   \VV/  **************************************************************)
+(*    //   *    This file is distributed under the terms of the         *)
+(*         *     GNU Lesser General Public License Version 2.1          *)
+(*         *     (see LICENSE file for the text of the license)         *)
+(************************************************************************)
+
+module W = AsyncTaskQueue.MakeWorker(Stm.ProofTask) ()
+
+let () =
+  WorkerLoop.start ~init:W.init_stdout ~loop:W.main_loop
diff --git a/topbin/coqqueryworker_bin.ml b/topbin/coqqueryworker_bin.ml
new file mode 100644
index 000000000..98c858121
--- /dev/null
+++ b/topbin/coqqueryworker_bin.ml
@@ -0,0 +1,13 @@
+(************************************************************************)
+(*         *   The Coq Proof Assistant / The Coq Development Team       *)
+(*  v      *   INRIA, CNRS and contributors - Copyright 1999-2018       *)
+(* <O___,, *       (see CREDITS file for the list of authors)           *)
+(*   \VV/  **************************************************************)
+(*    //   *    This file is distributed under the terms of the         *)
+(*         *     GNU Lesser General Public License Version 2.1          *)
+(*         *     (see LICENSE file for the text of the license)         *)
+(************************************************************************)
+
+module W = AsyncTaskQueue.MakeWorker(Stm.QueryTask) ()
+
+let () = WorkerLoop.start ~init:W.init_stdout ~loop:W.main_loop
diff --git a/topbin/coqtacticworker_bin.ml b/topbin/coqtacticworker_bin.ml
new file mode 100644
index 000000000..2634baa83
--- /dev/null
+++ b/topbin/coqtacticworker_bin.ml
@@ -0,0 +1,13 @@
+(************************************************************************)
+(*         *   The Coq Proof Assistant / The Coq Development Team       *)
+(*  v      *   INRIA, CNRS and contributors - Copyright 1999-2018       *)
+(* <O___,, *       (see CREDITS file for the list of authors)           *)
+(*   \VV/  **************************************************************)
+(*    //   *    This file is distributed under the terms of the         *)
+(*         *     GNU Lesser General Public License Version 2.1          *)
+(*         *     (see LICENSE file for the text of the license)         *)
+(************************************************************************)
+
+module W = AsyncTaskQueue.MakeWorker(Stm.TacTask) ()
+
+let () = WorkerLoop.start ~init:W.init_stdout ~loop:W.main_loop
diff --git a/topbin/coqtop_bin.ml b/topbin/coqtop_bin.ml
new file mode 100644
index 000000000..4490db59e
--- /dev/null
+++ b/topbin/coqtop_bin.ml
@@ -0,0 +1,16 @@
+(************************************************************************)
+(*         *   The Coq Proof Assistant / The Coq Development Team       *)
+(*  v      *   INRIA, CNRS and contributors - Copyright 1999-2018       *)
+(* <O___,, *       (see CREDITS file for the list of authors)           *)
+(*   \VV/  **************************************************************)
+(*    //   *    This file is distributed under the terms of the         *)
+(*         *     GNU Lesser General Public License Version 2.1          *)
+(*         *     (see LICENSE file for the text of the license)         *)
+(************************************************************************)
+
+let drop_setup () = Mltop.remove ()
+
+(* Main coqtop initialization *)
+let _ =
+  drop_setup ();
+  Coqtop.(start_coq coqtop_toplevel)
diff --git a/topbin/coqtop_byte_bin.ml b/topbin/coqtop_byte_bin.ml
new file mode 100644
index 000000000..abe397830
--- /dev/null
+++ b/topbin/coqtop_byte_bin.ml
@@ -0,0 +1,34 @@
+(************************************************************************)
+(*         *   The Coq Proof Assistant / The Coq Development Team       *)
+(*  v      *   INRIA, CNRS and contributors - Copyright 1999-2018       *)
+(* <O___,, *       (see CREDITS file for the list of authors)           *)
+(*   \VV/  **************************************************************)
+(*    //   *    This file is distributed under the terms of the         *)
+(*         *     GNU Lesser General Public License Version 2.1          *)
+(*         *     (see LICENSE file for the text of the license)         *)
+(************************************************************************)
+
+let drop_setup () =
+  begin try
+    (* Enable rectypes in the toplevel if it has the directive #rectypes *)
+    begin match Hashtbl.find Toploop.directive_table "rectypes" with
+      | Toploop.Directive_none f -> f ()
+      | _ -> ()
+    end
+    with
+    | Not_found -> ()
+  end;
+  let ppf = Format.std_formatter in
+  Mltop.(set_top
+           { load_obj = (fun f -> if not (Topdirs.load_file ppf f)
+                          then CErrors.user_err Pp.(str ("Could not load plugin "^f))
+                        );
+             use_file = Topdirs.dir_use ppf;
+             add_dir  = Topdirs.dir_directory;
+             ml_loop  = (fun () -> Toploop.loop ppf);
+           })
+
+(* Main coqtop initialization *)
+let _ =
+  drop_setup ();
+  Coqtop.(start_coq coqtop_toplevel)