(* COCANWIKI scripts.
 * Written by Richard W.M. Jones <rich@merjis.com>.
 * Copyright (C) 2004 Merjis Ltd.
 * $Id: diff.ml,v 1.3 2004/09/07 14:58:34 rich Exp $
 *)

open Apache
open Registry
open Cgi
open Printf

open Cocanwiki
open Cocanwiki_template
open Cocanwiki_diff

let template = get_template "diff.html"

let run r (q : cgi) (dbh : Dbi.connection) (hostid, _, _) _ =
  let page = q#param "page" in
  let page = if page = "" then "index" else page in

  (* "version" parameter, required, is the newest version.  If the
   * "old_version" parameter is given then we compare against that.
   * Otherwise we look in the database to find the version of this
   * page previous to "version", and use that as "old_version".  If
   * there is no older version in the database, then we compare against
   * version '0' which means a blank page.
   *
   * NB. In case you hadn't worked it out yet, version numbers are
   * page.ids.
   *)
  let version = int_of_string (q#param "version") in

  let diff, old_version =
    try
      let old_version = int_of_string (q#param "old_version") in
      get_diff dbh hostid page ~old_version ~version ()
    with
	Not_found ->
	  get_diff dbh hostid page ~version () in

  template#set "version" (string_of_int version);
  template#set "old_version" (string_of_int old_version);
  template#set "page" page;
  template#set "diff" diff;

  q#template template

let () =
  register_script run