util/pluginloader.lua

-- Prosody IM
-- Copyright (C) 2008-2010 Matthew Wild
-- Copyright (C) 2008-2010 Waqas Hussain
-- 
-- This project is MIT/X11 licensed. Please see the
-- COPYING file in the source package for more information.
--


local plugin_dir = CFG_PLUGINDIR or "./plugins/";

local io_open, os_time = io.open, os.time;
local loadstring, pairs = loadstring, pairs;

local datamanager = require "util.datamanager";

module "pluginloader"

local function load_from_datastore(name)
	local content = datamanager.load(name, nil, "plugins");
	if not content or not content[1] then return nil, "Resource not found"; end
	return content[1], name;
end

local function load_file(name)
	local file, err = io_open(plugin_dir..name);
	if not file then return file, err; end
	local content = file:read("*a");
	file:close();
	return content, name;
end

function load_resource(plugin, resource, loader)
	if not resource then
		resource = "mod_"..plugin..".lua";
	end
	loader = loader or load_file;

	local content, err = loader(plugin.."/"..resource);
	if not content then content, err = loader(resource); end
	-- TODO add support for packed plugins
	
	if not content and loader == load_file then
		return load_resource(plugin, resource, load_from_datastore);
	end
	
	return content, err;
end

function store_resource(plugin, resource, content, metadata)
	if not resource then
		resource = "mod_"..plugin..".lua";
	end
	local store = { content };
	if metadata then
		for k,v in pairs(metadata) do
			store[k] = v;
		end
	end
	datamanager.store(plugin.."/"..resource, nil, "plugins", store);
end

function load_code(plugin, resource)
	local content, err = load_resource(plugin, resource);
	if not content then return content, err; end
	return loadstring(content, "@"..err);
end

return _M;