Source file `log.ml`

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(*
 *  This file is part of the Watson Conversation Service OCaml API project.
 *
 * Copyright 2016-2017 IBM Corporation
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *)

exception Error of string * string

let column s =
  if s = "" then ""
  else ": "^s

let warning (module_name: string) (msg: string) : unit =
  Format.eprintf "[Warning%s] %s@." (column module_name) msg

let error_recovery = ref true

let print_error module_name msg =
  Format.eprintf "[Error%s] %s@." (column module_name) msg

let error (module_name: string) (default: 'a option) (msg: string) : 'a =
  begin match !error_recovery, default with
  | true, Some v ->
      print_error module_name msg;
      v
  | false, Some _
  | _, None -> raise (Error (module_name, msg))
  end

let debug_message = ref false

let debug (module_name: string) (msg: string) : unit =
  if !debug_message then
    Format.eprintf "[Debug%s] %s@." (column module_name) msg