1 (* COCANWIKI - a wiki written in Objective CAML.
2 * Written by Richard W.M. Jones <rich@merjis.com>.
3 * Copyright (C) 2004 Merjis Ltd.
4 * $Id: cocanwiki_template.ml,v 1.6 2004/10/17 19:43:19 rich Exp $
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program; see the file COPYING. If not, write to
18 * the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
19 * Boston, MA 02111-1307, USA.
21 * This module wraps around the Template library. It provides caching
22 * of templates and fills in standard fields on a host-specific basis.
29 open Cocanwiki_strings
32 (* This is used to generate the id fields from URLs on the site menu. *)
34 let str = String.copy str in
35 for i = 0 to String.length str - 1 do
36 if not (isalnum str.[i]) then str.[i] <- '_'
42 try Sys.getenv "COCANWIKI_TEMPLATES"
43 with Not_found -> "/usr/share/cocanwiki/templates" in
45 try (Unix.stat path).Unix.st_kind = Unix.S_DIR
46 with Unix.Unix_error _ -> false in
47 if not (is_dir base) then
48 failwith ("environment variable $COCANWIKI_TEMPLATES " ^
49 "must be set to point to my 'templates' directory " ^
50 "(see README file for more details)");
53 (* The webserver gets restarted regularly enough that this is reasonable. *)
54 let { tm_year = year } = gmtime (time ())
55 let year = year + 1900
57 (* Cache of precompiled templates, arranged by full path. *)
58 let cache = Hashtbl.create 32
60 let _get_template filename =
61 let path = base // filename in
62 let stat = Unix.stat path in
63 let mtime = stat.st_mtime in
66 let template, old_mtime = Hashtbl.find cache path in
67 if old_mtime < mtime then (
68 (* The template has changed on disk since it was compiled. Reload. *)
69 let template = Template.template path in
70 Hashtbl.replace cache path (template, mtime);
76 (* Template not seen before, so load it. *)
77 let template = Template.template path in
78 Hashtbl.replace cache path (template, mtime);
81 let get_template ?page (dbh : Dbi.connection) hostid filename =
82 let template = _get_template filename in
84 (* Get standard fields concerning this host from the database. *)
85 let sth = dbh#prepare_cached "select theme_css from hosts
87 sth#execute [`Int hostid];
90 match sth#fetch1 () with
91 [ `Null ] -> "/_css/standard.css"
92 | [ `String file ] -> file
93 | _ -> assert false in
95 template#set "theme_css" theme_css;
98 let sth = dbh#prepare_cached "select url, label, ordering from sitemenu
99 where hostid = ? order by ordering" in
100 sth#execute [`Int hostid];
105 | Some "index" -> true
107 template#conditional "is_homepage" is_homepage;
109 let table = sth#map (function [`String url; `String label; _] ->
113 | Some page when page = url -> false
115 let id = id_of_url url in
116 [ "url", Template.VarString url;
117 "label", Template.VarString label;
118 "is_linked", Template.VarConditional is_linked;
119 "id", Template.VarString id ]
120 | _ -> assert false) in
122 template#table "sitemenu" table;
125 template#set "cocanwiki_package" Cocanwiki_version.package;
126 template#set "cocanwiki_version" Cocanwiki_version.version;
128 (* Copyright year. *)
129 template#set "year" (string_of_int year);