Feedback cleanup

This patch splits pretty printing representation from IO operations.

- `Pp` is kept in charge of the abstract pretty printing representation.
- The `Feedback` module provides interface for doing printing IO.

The patch continues work initiated for 8.5 and has the following effects:

- The following functions in `Pp`: `pp`, `ppnl`, `pperr`, `pperrnl`,
  `pperr_flush`, `pp_flush`, `flush_all`, `msg`, `msgnl`, `msgerr`,
  `msgerrnl`, `message` are removed. `Feedback.msg_*` functions must be
  used instead.

- Feedback provides different backends to handle output, currently,
  `stdout`, `emacs` and CoqIDE backends are provided.

- Clients cannot specify flush policy anymore, thus `pp_flush` et al are
  gone.

- `Feedback.feedback` takes an `edit_or_state_id` instead of the old
  mix.

Lightly tested: Test-suite passes, Proof General and CoqIDE seem to work.

1 files changed, 2 insertions, 2 deletions

diff --git a/plugins/extraction/extract_env.ml b/plugins/extraction/extract_env.ml
index 67c1c5901..a03be5743 100644
--- a/plugins/extraction/extract_env.ml
+++ b/plugins/extraction/extract_env.ml
@@ -541,7 +541,7 @@ let print_structure_to_file (fn,si,mo) dry struc =
     (if dry then None else si);
   (* Print the buffer content via Coq standard formatter (ok with coqide). *)
   if not (Int.equal (Buffer.length buf) 0) then begin
-    Pp.msg_notice (str (Buffer.contents buf));
+    Feedback.msg_notice (str (Buffer.contents buf));
     Buffer.reset buf
   end
 
@@ -635,7 +635,7 @@ let simple_extraction r =
       in
       let ans = flag ++ print_one_decl struc (modpath_of_r r) d in
       reset ();
-      Pp.msg_notice ans
+      Feedback.msg_notice ans
   | _ -> assert false