modlib/mod.lua

-- get modpath wrapper
function get_resource(modname, resource)
    return minetest.get_modpath(modname) .. "/" .. resource
end

-- get resource + dofile
function include(modname, file)
    dofile(get_resource(modname, file))
end

-- loadfile with table env
function include_class(classname, filename)
    _G[classname] = setmetatable(_G[classname] or {}, {__index = _G, __call = _G})
    local class = assert(loadfile(filename))
    setfenv(class, _G[classname])
    class()
    return _G[classname]
end

-- runs main.lua in table env
function include_mod(modname)
    include_class(modname, get_resource(modname, "main.lua"))
end

function extend_mod(modname, filename)
    include_class(modname, get_resource(modname, filename .. ".lua"))
end

function extend_mod_string(modname, string)
    _G[modname] = setmetatable(_G[modname] or {}, {__index = _G, __call = _G})
    local string = assert(loadstring(string))
    setfenv(string, _G[modname])
    string()
    return _G[modname]
end