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local core = {}
--- Create a boolean toggle with on/off callbacks.
function core.toggle(on, off)
local state = false
return {
set = function(v)
if v == state then
return state
end
state = not not v
if state then
on()
else
off()
end
return state
end,
get = function()
return state
end,
toggle = function(self)
return self.set(not state)
end,
}
end
--- Create a resettable timeout using blocking sleep (matches waywall execution model).
--- Calls `f()` only if this invocation is the last one.
function core.resettable_timeout(sleep, f)
local gen = 0
return function(delay_ms)
gen = gen + 1
local my = gen
sleep(delay_ms)
if my == gen then
f()
end
end
end
--- Shallow table copy
function core.copy(t)
local r = {}
for k, v in pairs(t) do
r[k] = v
end
return r
end
--- Merge (dst gets missing fields from src)
function core.merge(dst, src)
for k, v in pairs(src or {}) do
if dst[k] == nil then
dst[k] = v
end
end
return dst
end
return core
|
