(* COCANWIKI - a wiki written in Objective CAML.
 * Written by Richard W.M. Jones <rich@merjis.com>.
 * Copyright (C) 2004 Merjis Ltd.
 * $Id: cocanwiki_files.ml,v 1.2 2004/09/09 12:21:22 rich Exp $
 *
 * 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; see the file COPYING.  If not, write to
 * the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 *)

open Printf

(*----- File functions. -----*)

let (//) = Filename.concat

let rec input_all_lines chan =
  try
    let line = input_line chan in
    line :: input_all_lines chan
  with
      End_of_file -> []

let input_all chan =
  let buf = Buffer.create 16384 in
  let tmpsize = 16384 in
  let tmp = String.create tmpsize in
  let n = ref 0 in
  while n := input chan tmp 0 tmpsize; !n > 0 do
    Buffer.add_substring buf tmp 0 !n;
  done;
  Buffer.contents buf

let input_file filename =
  let chan = open_in_bin filename in
  let data = input_all chan in
  close_in chan;
  data

let output_file filename data =
  let chan = open_out_bin filename in
  output_string chan data;
  close_out chan

let output_tempfile data =
  let filename, chan = Filename.open_temp_file "tmp" ".tmp" in
  output_string chan data;
  close_out chan;
  filename

(*----- Command functions. -----*)

let cmd cmd =
  let code = Sys.command cmd in
  if code <> 0 then failwith (cmd ^ ": error code " ^ string_of_int code)

let copy infile outfile =
  cmd (sprintf "cp %s %s" infile outfile)

let pget cmd =
  let chan = Unix.open_process_in cmd in
  let lines = input_all_lines chan in
  let stat = Unix.close_process_in chan in
  (match stat with
       Unix.WEXITED 0 -> ()
     | Unix.WEXITED i ->
	 failwith ("command failed with code " ^ string_of_int i)
     | Unix.WSIGNALED i ->
	 failwith ("command killed by signal " ^ string_of_int i)
     | Unix.WSTOPPED i ->
	 failwith ("command stopped by signal " ^ string_of_int i));
  lines

let unlink file =
  try Unix.unlink file with Unix.Unix_error _ -> ()