(* Copyright (C) 2000, HELM Team.
 * 
 * This file is part of HELM, an Hypertextual, Electronic
 * Library of Mathematics, developed at the Computer Science
 * Department, University of Bologna, Italy.
 * 
 * HELM is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 * 
 * HELM 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
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with HELM; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston,
 * MA  02111-1307, USA.
 * 
 * For details, see the HELM World-Wide-Web page,
 * http://cs.unibo.it/helm/.
 *)

type flag = Postgres | Galax | Stat | Quiet | Warn

val string_of_flags : flag list -> string
val flags_of_string : string -> flag list

exception InvalidConnection

type handle

val init      : flag list -> (string -> unit) -> handle
val close     : handle -> unit
val connected : handle -> bool

val init_if_connected : flag list -> (string -> unit) -> handle

(* The following functions allow to read the handle internal fields. 
 * For exclusive use of the interpreter.  
 *)

val log       : handle -> string -> unit
val set       : handle -> flag -> bool   
val pgc       : handle -> Postgres.connection