-- inc.lua
--
-- Usage: <action application="set" data="ext=${lua(inc.lua $1 -30)}" />
assert(stream, 'this is API command')
local number = assert(argv[1])
local delta  = argv[2] or 1
local result = tonumber(number) + tonumber(delta)
local fmt = string.format("%%.%dd", #number)
result = string.format(fmt, result)
stream:write(result)