add lua-script for http://www.katsomo.fi/?treeId= urls

Original php-code made by Toni Korhonen, and I made lua script based
on that example.

share/lua/playlist/katsomo.lua

+--[[
+   Translate www.katsomo.fi video webpages URLs to the corresponding
+   movie URL
+
+ $Id$
+ Copyright © 2009 the VideoLAN team
+
+ 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; if not, write to the Free Software
+ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
+--]]
+
+-- Probe function.
+function probe()
+    return vlc.access == "http"
+        and string.match( vlc.path, "www.katsomo.fi" )
+end
+
+function find( haystack, needle )
+    local _,_,r = string.find( haystack, needle )
+    return r
+end
+
+-- Parse function.
+function parse()
+    p = {}
+    while true
+    do
+        line = vlc.readline()
+        if not line then break end
+        if string.match( line, "<title>" )
+        then
+            title = vlc.strings.decode_uri( find( line, "<title>(.-)<" ) )
+            vlc.msg.info("found title: "..title)
+        end
+        if string.match( line, "<li class=\"program\"" )
+        then
+            description = vlc.strings.resolve_xml_special_chars( find( line, "title=\"(.-)\"" ) )
+            vlc.msg.info("found description:"..description)
+        end
+        for programid in string.gmatch( line, "<li class=\"program\" id=\"program(.-)\"" ) do
+            vlc.msg.info("found program id "..programid)
+            path = "http://www.katsomo.fi/metafile.asx?p="..programid.."&bw=800"
+            table.insert( p, { path = path; name = title; description = description; url = vlc.path;} )
+        end
+    end
+    return p
+end