(* COCANWIKI - a wiki written in Objective CAML.
 * Written by Richard W.M. Jones <rich@merjis.com>.
 * Copyright (C) 2004 Merjis Ltd.
 * $Id: page_rss.ml,v 1.2 2004/11/02 11:05:59 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.
 *
 *---
 *
 * This generates an RSS feed from a page.  Articles in the RSS feed are
 * mapped to sections in the page.  At the moment it's fairly crude, but
 * it's good enough for blogging at the moment.  We can think about
 * cleaning it up later.
 *)

open Apache
open Registry
open Cgi
open Printf

open Cocanwiki
open Cocanwiki_template

let run r (q : cgi) (dbh : Dbi.connection) hostid {hostname = hostname} _ =
  let template = get_template dbh hostid "page_rss.xml" in

  let page = q#param "page" in
  let page = if page = "" then "index" else page in
  template#set "page" page;

  template#set "hostname" hostname;

  (* Get the title and description of the page. *)
  let sth = dbh#prepare_cached "select id, title, description
                                  from pages
                                 where hostid = ? and url = ?
                                   and redirect is null" in
  sth#execute [`Int hostid; `String page];

  let pageid, title, description =
    match sth#fetch1 () with
	[ `Int id; `String title; `String description ] ->
	  id, title, description
      | _ -> assert false in

  template#set "title" title;
  template#set "description" description;

  (* Get the sections in the live page. *)
  let sth = dbh#prepare_cached "select sectionname, content, ordering
                                  from contents
                                 where pageid = ?
                                   and sectionname is not null
                                 order by ordering" in
  sth#execute [`Int pageid];

  let sections =
    sth#map (function [`String sectionname; `String content; _] ->
	       sectionname, content
	       | _ -> assert false) in

  let sections =
    List.map (fun (sectionname, content) ->
		let content = Wikilib.xhtml_of_content dbh hostid content in
		let linkname = linkname_of_sectionname sectionname in
		[ "sectionname", Template.VarString sectionname;
		  "linkname", Template.VarString linkname;
		  "content", Template.VarString content ]
	     ) sections in

  template#table "sections" sections;

  q#template ~content_type:"application/rss+xml" template

let () =
  register_script ~restrict:[CanView] run