Button version of Cycler

CyclerB.lua

--[[ 	
    Cycler B(utton version)

    [PLAY] = A hijacked button that (repeatedly pressing) allows you to cycle through various options that this button can do: change ML state to the next one, use [PlAY] normally, shoot a bookmark image
    Straight after [PLAY]
        [Half_Shutter_Press] = reverse state change cycle direction (black = to the right, red = anitclocto the left)
        [MENU] = select/run option
        [anykey] other than [PLAY] or [MENU] when cycling = normal action plus resets cycle and show the ML state you are in
    
    Options and ML states are shown in RHS of the ML top bar

    The script can be switched off in the ML Shoot menu

    Version 1.24
    Garry George April  2019
    http://photography.grayheron.net/
--]]																							

config_ref = 1 -- start cam in nulled out state, see reset function below
config_states = {"NULL", "ETTR","AUTO","ZOOM","DISO","WAVE"} -- add/change as required but make sure you manage changes in function reset
button = KEY.PLAY -- could use KEY.INFO or KEY.MENU etc, but best not to use KEY.SET
select_button = KEY.MENU -- could use KEY.INFO or KEY.PLAY etc, but best not to use KEY.SET
cycled = true -- ensures ML states nulled out on cam start
selected = false
button_pressed = false
direction = 1 -- used to cycle ML states 'clockwise' or 'anticlockwise'
bookmark_apex = 11 -- APEX shutter value for (dark) bookmark, could be 10 or 12 etc. Note script auto resets the shutter after a bookmark image
current_shutter = camera.shutter.apex
options = {"CYCL","PLAY","BOOK"} -- add more or change, but ensure you reflect changes below in function reset
option = 1
use_normally = false 
last_key = 0
option_1_vis = false
switched_off = false
CON = {"ON","OFF"}

function reset(m)
    if switched_off then return true end

    if selected then 
        selected = false
        button_pressed = false -- reset [button]
        if option == 1 then -- cycle ML states 
            config_ref = config_ref + direction
            if config_ref > #config_states then config_ref = 1 end
            if config_ref < 1 then config_ref = #config_states end
            cycled = true
        elseif option == 2 then -- normal button action
            use_normally = true
            option = 1 -- reset button to cycle
            key.press(button)
        elseif option == 3 then -- take a bookmark image
            current_shutter = camera.shutter.apex
            camera.shutter.apex = bookmark_apex
            camera.shoot()
            camera.shutter.apex = current_shutter
            option = 1 -- reset button to cycle
        end
    end

    
    if cycled then -- change ML state: adapt this framework as required
        if config_ref == 1 then -- reset (null out) everything (note put menus to be managed here and manage state changes below, ie cycling in both directions)
            menu.set("Expo","Auto ETTR",0)
            menu.set("Shoot","Advanced Bracket",0)
            menu.set("Expo","Dual ISO",0)
            menu.set("Overlay","Magic Zoom",0)
            menu.set("Overlay","Waveform",0)
            display.clear()
        elseif config_ref == 2 then -- switch to ETTR
            menu.set("Shoot","Advanced Bracket",0)
            menu.set("Expo","Auto ETTR",1) 
        elseif config_ref == 3 then -- switch to bracketing
            menu.set("Expo","Auto ETTR",0)
            menu.set("Overlay","Magic Zoom",0)
            menu.set("Shoot","Advanced Bracket",1)
        elseif config_ref == 4 then -- switch to Magic Zoom
            menu.set("Shoot","Advanced Bracket",0)
            menu.set("Expo","Dual ISO",0)
            menu.set("Overlay","Magic Zoom",1)
        elseif config_ref == 5 then -- switch to Dual ISO
            menu.set("Overlay","Magic Zoom",0)
            menu.set("Overlay","Waveform",0)
            display.clear()
            menu.set("Expo","Dual ISO",1)
        elseif config_ref == 6 then -- switch to Waveform
            menu.set("Expo","Dual ISO",0)
            menu.set("Overlay","Waveform",1)
        -- add other state changes here, plus add to config_states table
        -- elseif config_ref == 7 etc
        end
        cycled = false
    end
end
 
function testkeys(kk)
    if switched_off then return true end
    
    if (kk == KEY.UNPRESS_HALFSHUTTER) and last_key == KEY.HALFSHUTTER and option_1_vis then -- reset and change direction of ML state changes
        direction = -direction
        last_key = kk
        return true
    end
    
    if kk == button then
        if use_normally then
            use_normally = false
            button_pressed = false -- reset [button]
            option = 1 -- reset button to cycle option
            last_key = kk
            return true
        end

        if (not button_pressed) then -- first push of cycler button in this sequence
            button_pressed = true
            return false
        else -- cycle through options
            button_pressed = true
            option = option + 1
            if option > #options then option = 1 end
            return false
        end
    end

    if kk == select_button and button_pressed then
        selected = true
        button_pressed = false -- reset [button]
        return false
    end
    
    last_key = kk
    return true
end

lv.info
{
    name = "Cycler State",
    value = "",
    priority = 100,
    update = function(this)
        if switched_off then 
            this.value = ""
            return true
        end
        this.background = COLOR.WHITE
        this.foreground = COLOR.BLACK 
        option_1_vis = false
        if not button_pressed then
            this.value = config_states[config_ref]
        else
            if option == 1 then
                option_1_vis = true
                if direction == -1 and option == 1 then this.foreground = COLOR.RED end
                local last = config_ref - 1
                if last < 1 then last = #config_states end
                local next = config_ref + 1
                if next > #config_states then next = 1 end
                this.value = config_states[last].."/"..config_states[config_ref].."/"..config_states[next]
            else 
                option_1_vis = false
                this.value = options[option] 
            end
        end
    end
}

Scaler_Menu = menu.new
{
    parent = "Shoot",
    name = "Scaler",
    help = "Helps to control ML state changes",
    depends_on = DEPENDS_ON.LIVEVIEW,
    choices = CON,
    update = function(this)
        if this.value == "ON" then switched_off = false else switched_off = true end
    end,
}

event.shoot_task = reset
event.keypress = testkeys