Plug-in for autoscroll

[pachpict]

(I didn't think this was appropriate for the issues list until I'd discussed it here first to flesh it out and understand better.)

I have a customer who wishes their Braille display running Micro editor to autoscroll (for read-only mode, but that's besides the point). I assume the best way of doing this is to develop a plug-in but I've never written anything in Lua.

What follows is roughly what I'm looking to achieve:

local micro = import("micro")
# I don't know how `config.NoComplete` works
function init()
	config.MakeCommand("autoscroll", autoscrollCommand, config.NoComplete)
	config.TryBindKey("F12", "command:autoscroll", true)
function autoscrollCommand()
	# Wait X (20) seconds.
	# Move down by X lines (ideally move down by same number as PgDn would, so perhaps simulate a PgDn key press).
	# Cancel autoscroll if function is called again.

I've looked at the existing plug-ins but am missing the following:

• How should I do a delay? Answers given online seem platform specific.
• Can I trigger a keypress from within a function?
• I can work out the cancelling it part myself.

Thank you in advance for your patience. I know I am missing some basic knowledge here and apologise if it is well documented somewhere that I overlooked. That's why I haven't opened an issue yet.

---

EDIT: jump looks like the correct command to trigger for moving down X lines. I would prefer to simulate a PgDn key but it is of no practical consideration really.

[cutelisp]

Made a little sketch with your requirements, surely this need improvements for proper use, such as a way to adjust the delay.
Hope it helps, feel free to ask smth

local micro = import("micro")
local config = import("micro/config")
local time = import("time")
local delay = time.ParseDuration("20s") 

local is_on = false

function init()
    config.MakeCommand("autoscroll", toggle, config.NoComplete)
    config.TryBindKey("F12", "command:autoscroll", true)
    micro.SetStatusInfoFn("autoscroll.status") -- Add $(autoscroll.status) to "statusformatl"
end

function status()
    return is_on and "Autoscroll " or ""
end

function toggle(bp)
    is_on = not is_on
    if is_on then
        micro.After(delay, function() autoscroll(bp) end) 
    end
end

function autoscroll(bp)
    if not is_on then return end
    bp:PageDown()
    micro.After(delay, function() autoscroll(bp) end)
end

function preEscape(bp)
    if is_on then is_on = false end
end

[pachpict]

(Deleted my last post as I thought I was running on the latest version but that was a mistake on my part. It therefore wasn't working because there was no micro.After function.)

The above works wonderfully, thanks @cutelisp for all your help, and thanks from our customers!