(* Guestfs Browser.
 * Copyright (C) 2010 Red Hat Inc.
 *
 * This program 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.
 *
 * This program 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 this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 *)

open Printf

let (+^) = Int64.add
let (-^) = Int64.sub
let ( *^ ) = Int64.mul
let (/^) = Int64.div

type ('a, 'b) either = Left of 'a | Right of 'b

let verbose = ref false
let set_verbose_flag () = verbose := true
let verbose () = !verbose

let write_flag = ref false
let set_write_flag () = write_flag := true
let write_flag () = !write_flag

let debug fs =
  let f str =
    if verbose () then (
      prerr_string Config.package;
      prerr_string ": ";
      prerr_string str;
      prerr_newline ()
    )
  in
  ksprintf f fs

let failwith fs =
  let f str =
    if verbose () then (prerr_string str; prerr_newline ());
    raise (Failure str)
  in
  ksprintf f fs

let utf8_rarrow = "\xe2\x86\x92"

let human_size_1k i =
  if i < 1024L then
    sprintf "%LdK" i
  else if i < 1024L *^ 1024L then
    sprintf "%.1fM" (Int64.to_float i /. 1024.)
  else
    sprintf "%.1fG" (Int64.to_float i /. 1024. /. 1024.)