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 1.2 2004/10/23 10:13:20 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
31 (* This is used to generate the id fields from URLs on the site menu. *)
33 let str = String.copy str in
34 for i = 0 to String.length str - 1 do
35 if not (isalnum str.[i]) then str.[i] <- '_'
41 try Sys.getenv "COCANWIKI_TEMPLATES"
42 with Not_found -> "/usr/share/cocanwiki/templates" in
44 try (Unix.stat path).Unix.st_kind = Unix.S_DIR
45 with Unix.Unix_error _ -> false in
46 if not (is_dir base) then
47 failwith ("environment variable $COCANWIKI_TEMPLATES " ^
48 "must be set to point to my 'templates' directory " ^
49 "(see README file for more details)");
52 (* The webserver gets restarted regularly enough that this is reasonable. *)
53 let { tm_year = year } = gmtime (time ())
54 let year = year + 1900
56 (* Cache of precompiled templates, arranged by full path. *)
57 let cache = Hashtbl.create 32
59 let _get_template filename =
60 let path = base // filename in
61 let stat = Unix.stat path in
62 let mtime = stat.st_mtime in
65 let template, old_mtime = Hashtbl.find cache path in
66 if old_mtime < mtime then (
67 (* The template has changed on disk since it was compiled. Reload. *)
68 let template = Template.template path in
69 Hashtbl.replace cache path (template, mtime);
75 (* Template not seen before, so load it. *)
76 let template = Template.template path in
77 Hashtbl.replace cache path (template, mtime);
80 let get_template ?page (dbh : Dbi.connection) hostid filename =
81 let template = _get_template filename in
83 (* Get standard fields concerning this host from the database. *)
86 "select h.theme_css, p.name, p.url
87 from hosts h left outer join powered_by p on h.powered_by = p.id
89 sth#execute [`Int hostid];
91 let theme_css, powered_by_name, powered_by_url =
92 match sth#fetch1 () with
93 | [ a; b; c] -> a, b, c
94 | _ -> assert false in
97 | `Null -> "/_css/standard.css"
98 | `String file -> file
99 | _ -> assert false in
100 let powered_by_name, powered_by_url =
101 match powered_by_name, powered_by_url with
103 let url = "http://sandbox.merjis.com/" in
104 let name = Cocanwiki_version.package ^ " " ^
105 Cocanwiki_version.version in
107 | `String name, `String url -> name, url
108 | _ -> assert false in
110 template#set "theme_css" theme_css;
111 template#set "powered_by_name" powered_by_name;
112 template#set "powered_by_url" powered_by_url;
115 let sth = dbh#prepare_cached "select url, label, ordering from sitemenu
116 where hostid = ? order by ordering" in
117 sth#execute [`Int hostid];
122 | Some "index" -> true
124 template#conditional "is_homepage" is_homepage;
126 let table = sth#map (function [`String url; `String label; _] ->
130 | Some page when page = url -> false
132 let id = id_of_url url in
133 [ "url", Template.VarString url;
134 "label", Template.VarString label;
135 "is_linked", Template.VarConditional is_linked;
136 "id", Template.VarString id ]
137 | _ -> assert false) in
139 template#table "sitemenu" table;
142 template#set "cocanwiki_package" Cocanwiki_version.package;
143 template#set "cocanwiki_version" Cocanwiki_version.version;
145 (* Copyright year. *)
146 template#set "year" (string_of_int year);