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-- tools for registering callbacks periodically

local _ENV = mkmodule("repeat-util")

repeating = repeating or {}

dfhack.onStateChange.repeatUtilStateChange = function(code)

if code == SC_WORLD_UNLOADED then

repeating = {}

end

end

function isScheduled(name)

return repeating[name] ~= nil

end

function listScheduled()

local result = {}

for name, _ in pairs(repeating) do

table.insert(result, name)

end

return result

end

function cancel(name)

if not repeating[name] then

return false

end

if repeating[name] ~= -1 then

dfhack.timeout_active(repeating[name], nil)

end

repeating[name] = nil

return true

end

function scheduleEvery(name, time, timeUnits, func)

cancel(name)

local function helper()

local now_ms = dfhack.getTickCount()

func()

dfhack.internal.recordRepeatRuntime(name, now_ms)

if repeating[name] then

repeating[name] = dfhack.timeout(time, timeUnits, helper)

end

end

repeating[name] = -1

helper()

end

function scheduleUnlessAlreadyScheduled(name, time, timeUnits, func)

if repeating[name] then

return

end

scheduleEvery(name, time, timeUnits, func)

end

return _ENV