(*
    ||M||  This file is part of HELM, an Hypertextual, Electronic        
    ||A||  Library of Mathematics, developed at the Computer Science     
    ||T||  Department, University of Bologna, Italy.                     
    ||I||                                                                
    ||T||  HELM is free software; you can redistribute it and/or         
    ||A||  modify it under the terms of the GNU General Public License   
    \   /  version 2 or (at your option) any later version.              
     \ /   This software is distributed as is, NO WARRANTY.              
      V_______________________________________________________________ *)

module F = Format
module O = MetaOutput

type out_channel = Pervasives.out_channel * F.formatter

(* internal functions *******************************************************)

let hal_dir = "hal"

let hal_ext = ".hal"

(* interface functions ******************************************************)

let open_out f name =      
   let _ = Sys.command (Printf.sprintf "mkdir -p %s" hal_dir) in
   let och = open_out (Filename.concat hal_dir (name ^ hal_ext)) in
   let frm = F.formatter_of_out_channel och in
   F.pp_set_margin frm max_int;
   f (och, frm)

let write_entity f (_, frm) entity =
   O.pp_entity f frm entity
   
let close_out f (och, _) =
   close_out och; f ()