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------------------------------------------------------------------
-- macro.lua:
-- Crawl macro framework for Lua.
--
-- Macros are called as Lua coroutines. If the macro yields false, the
-- coroutine is discarded (assuming an error). If the macro yields
-- true, Crawl will start a macro delay for the macro and call the
-- coroutine again next turn. If the macro just returns, the coroutine
-- is assumed to be done.
--
-- Why coroutines: Macros may need to perform actions that take
-- multiple turns, which requires control to return to Crawl to
-- perform world updates between actions. Coroutines are the simplest
-- way to pass control back and forth without losing the macro's
-- state.
------------------------------------------------------------------
function c_macro(fn)
if fn == nil then
if c_macro_coroutine ~= nil then
local coret, mret
coret, mret = coroutine.resume(c_macro_coroutine)
if not coret or not mret then
c_macro_coroutine = nil
c_macro_name = nil
end
if not coret and mret then
error(mret)
end
return (coret and mret)
end
return false
end
if _G[fn] == nil or type(_G[fn]) ~= 'function' then
return false
end
c_macro_name = fn
c_macro_coroutine = coroutine.create(_G[fn])
return c_macro()
end
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