--[[
LuCI - Internationalisation

Description:
A very minimalistic but yet effective internationalisation module

FileId:
$Id$

License:
Copyright 2008 Steven Barth <steven@midlink.org>

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

	http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.

]]--

--- LuCI translation library.
module("luci.i18n", package.seeall)
require("luci.util")

local tparser = require "luci.template.parser"

table   = {}
i18ndir = luci.util.libpath() .. "/i18n/"
loaded  = {}
context = luci.util.threadlocal()
default = "en"

--- Clear the translation table.
function clear()
end

--- Load a translation and copy its data into the translation table.
-- @param file	Language file
-- @param lang	Two-letter language code
-- @param force	Force reload even if already loaded (optional)
-- @return		Success status
function load(file, lang, force)
end

--- Load a translation file using the default translation language.
-- Alternatively load the translation of the fallback language.
-- @param file	Language file
-- @param force	Force reload even if already loaded (optional)
function loadc(file, force)
end

--- Set the context default translation language.
-- @param lang	Two-letter language code
function setlanguage(lang)
	context.lang   = lang:gsub("_", "-")
	context.parent = (context.lang:match("^([a-z][a-z])_"))
	if not tparser.load_catalog(context.lang, i18ndir) then
		if context.parent then
			tparser.load_catalog(context.parent, i18ndir)
			return context.parent
		end
	end
	return context.lang
end

--- Return the translated value for a specific translation key.
-- @param key	Default translation text
-- @return		Translated string
function translate(key)
	return tparser.translate(key) or key
end

--- Return the translated value for a specific translation key and use it as sprintf pattern.
-- @param key		Default translation text
-- @param ...		Format parameters
-- @return			Translated and formatted string
function translatef(key, ...)
	return tostring(translate(key)):format(...)
end

--- Return the translated value for a specific translation key
-- and ensure that the returned value is a Lua string value.
-- This is the same as calling <code>tostring(translate(...))</code>
-- @param key		Default translation text
-- @return			Translated string
function string(key)
	return tostring(translate(key))
end

--- Return the translated value for a specific translation key and use it as sprintf pattern.
-- Ensure that the returned value is a Lua string value.
-- This is the same as calling <code>tostring(translatef(...))</code>
-- @param key		Default translation text
-- @param ...		Format parameters
-- @return			Translated and formatted string
function stringf(key, ...)
	return tostring(translate(key)):format(...)
end