(* Virt-resize UI.
 * Copyright (C) 2011 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.
 *)

(** General-purpose utility code used everywhere. *)

val (+^) : int64 -> int64 -> int64
val (-^) : int64 -> int64 -> int64
val ( *^ ) : int64 -> int64 -> int64
val (/^) : int64 -> int64 -> int64
val (&^) : int64 -> int64 -> int64
  (** Int64 arithmetic operators. *)

type ('a, 'b) either = Left of 'a | Right of 'b
  (** A value which is either an ['a] or a ['b], just like Haskell's
      "Either" type. *)

val verbose : unit -> bool
val set_verbose_flag : unit -> unit
  (** If this contains [true] then {!debug} will send debugging
      messages to stderr, else debugging messages are dropped.

      This is set through the --verbose command line option. *)

val debug : ('a, unit, string, unit) format4 -> 'a
  (** A printf-like function for writing debugging messages. *)

val failwith : ('a, unit, string, 'b) format4 -> 'a
  (** Replacement for standard OCaml [failwith] function.  This can
      take a printf-like argument list, and also logs errors on stderr
      when verbose is enabled. *)

val trace : unit -> bool
val set_trace_flag : unit -> unit
  (** If this contains [true] then calls to libguestfs are traced.

      This is set through the [-x] command line option. *)

val connect_uri : unit -> string option
val set_connect_uri : string option -> unit
  (** The libvirt connection URI.

      This is set through the [--connect] command line option. *)

val utf8_copyright : string (** UTF-8 copyright symbol *)
val utf8_rarrow : string (** UTF-8 RIGHTWARDS ARROW *)

val human_size : int64 -> string
  (** Convert a number of bytes into a human readable string. *)

val human_size_1k : int64 -> string
  (** Same as {!human_size} but the argument is 1KB blocks (used for
      disk usage). *)

val unique : unit -> int
  (** Return a new integer each time called. *)

val find_map : ('a -> 'b option) -> 'a list -> 'b
  (** [find_map f xs] calls function [f] on each member of [xs] in order.
      If [f] returns [Some b] then we stop and return [b].  If all calls
      to [f] return [None] then this raises [Not_found]. *)

val markup_escape : string -> string
  (** Like g_markup_escape but with extra protection for strings
      containing \0 characters. *)

val libguestfs_version_string : unit -> string
  (** Return the version of libguestfs as a string. *)

val libvirt_version_string : unit -> string
  (** Return the version of libvirt as a string. *)