Lua sleep/timeout/join

[ralpha]

From a Lua script is it possible to sleep/wait on the main thread for something to be loaded?

I know it is possible to use:

dfhack.timeout(120, 'frames', function() dosomething() end)

But this returns the main thread back (don't know if it is handled by threads or something else be still the same).
If I want to wait for some loadingscreen to be done loading I have to do some recursive waiting in order to make this work.
The other solution is apparently to use:

local script = require 'gui.script'
script.start(function()
  dosomething()
end)

But is there some way of doing a thread.join() for the main thread to wait for the execution of the script until it is done?

It is related to: http://www.bay12forums.com/smf/index.php?topic=176439.msg8151854#msg8151854

[lethosor]

The gui.script module is a wrapper around Lua coroutines, which aren't really the same as threads. There isn't a way to tell if one is "done", as far as I know, so detecting when exportlegends has finished would be pretty hard.

If you're interested in waiting for a world to load, test/main.lua does something a bit hacky that works for the title screen - script.delay() delays a coroutine, which is a simple way to poll for a viewscreen change without repeated calls to dfhack.timeout():

dfhack/test/main.lua

Lines 94 to 112 in 5d05cfc

	function ensure_title_screen()
	if df.viewscreen_titlest:is_instance(dfhack.gui.getCurViewscreen()) then
	return
	end
	print('Looking for title screen...')
	for i = 0, 100 do
	local scr = dfhack.gui.getCurViewscreen()
	if df.viewscreen_titlest:is_instance(scr) then
	print('Found title screen')
	break
	else
	scr:feed_key(df.interface_key.LEAVESCREEN)
	delay(10)
	end
	end
	if not df.viewscreen_titlest:is_instance(dfhack.gui.getCurViewscreen()) then
	error('Could not find title screen')
	end
	end

Just like exportlegends, test/main will return without waiting for coroutines to finish. It does support running another command when tests have finished, though. Maybe exportlegends could do this too.

[lethosor]

Assuming this was figured out in DFHack/scripts#152