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Utils.lua
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Utils.lua
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-- Crafting Mod - Brewing in Minetest
-- Copyright (C) 2020
--
-- This library is free software; you can redistribute it and/or
-- modify it under the terms of the GNU Lesser General Public
-- License as published by the Free Software Foundation; either
-- version 2.1 of the License, or (at your option) any later version.
--
-- This library 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
-- Lesser General Public License for more details.
--
-- You should have received a copy of the GNU Lesser General Public
-- License along with this library; if not, write to the Free Software
-- Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
utils = brewery.utils
--@returns - true if it added the key successfully
-- - false if it didn't add the key
function utils.add_to_set(set, key)
assert(set, "set can't be null")
assert(key, "key can't be null")
set[key] = true
return set[key] == true
end
--@returns - true if it contains the key
-- - false if it doesn't
function utils.contains_set(set, key)
return set[key] ~= nil
end
--@returns - true if it was successfully removed
-- - false if it wasn't
function utils.remove_set(set, key)
assert(set, "set can't be null")
assert(key, "key can't be null")
set[key] = nil
return set[key] == nil
end
--@returns - the OS date time
function utils.get_current_time()
return os.date("*t")
end
--Checks if a given meta data contains a string, and if it doesn't
--it return's the alternative string
--@params meta - the metadata of the node/item
--@params meta_string - the value to look for inside the metadata
--@params alternative - the alternative string to write
function utils.meta_string_alt(meta, meta_string, alternative)
assert(meta, "meta can't be null")
assert(alternative,"alternative can't be null")
local string = meta:get_string(meta_string)
if string == "" then return alternative
else return string end
end