+(* COCANWIKI - a wiki written in Objective CAML.
+ * Written by Richard W.M. Jones <rich@merjis.com>.
+ * Copyright (C) 2004 Merjis Ltd.
+ * $Id: broken_links.ml,v 1.1 2004/10/09 16:25:08 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 Apache
+open Registry
+open Cgi
+open Printf
+
+open Cocanwiki
+open Cocanwiki_template
+
+let keys h = Hashtbl.fold (fun key _ xs -> key :: xs) h []
+
+let run r (q : cgi) (dbh : Dbi.connection) hostid _ _ =
+ let template = get_template dbh hostid "broken_links.html" in
+
+ (* The links table (to_url) field can now point to a non-existant
+ * page. It's from this observation that we are able to retrieve
+ * the complete list of broken links. Links to empty template pages
+ * aren't broken links either because some of the content is
+ * synthesized.
+ *)
+ let sth =
+ dbh#prepare_cached
+ "select l.from_url, p.title, l.to_url
+ from links l, pages p
+ where l.hostid = ?
+ and l.hostid = p.hostid and l.from_url = p.url
+ and p.redirect is null
+ and not exists (select id from pages
+ where hostid = l.hostid and url = l.to_url)
+ and not exists (select id from templates
+ where l.to_url ~ url_regexp)
+ order by 3, 1 desc" in
+ sth#execute [`Int hostid];
+
+ (* Group the links together. *)
+ let h = Hashtbl.create 32 in
+ sth#iter (function [`String from_url; `String from_title; `String to_url] ->
+ let a = try Hashtbl.find h to_url with Not_found -> [] in
+ let a = (from_url, from_title) :: a in
+ Hashtbl.replace h to_url a
+ | _ -> assert false);
+
+ let keys = List.sort compare (keys h) in
+ let table =
+ List.map
+ (fun to_url ->
+ let values = Hashtbl.find h to_url in
+ let table =
+ List.map
+ (fun (from_url, from_title) ->
+ [ "page", Template.VarString from_url;
+ "title", Template.VarString from_title ]) values in
+ [ "url", Template.VarString to_url;
+ "references", Template.VarTable table ]) keys in
+
+ template#table "links" table;
+
+ q#template template
+
+let () =
+ register_script ~restrict:[CanView] run