[ComputerCraft] Screen Calibrator

-- ComputerCraft Screen Calibrator
-- For whenever you need a bigger display
-- but the monitors change IDs on reboots

if (not(fs.exists("monitorScreen")) or (monitorScreen == nil)) then
    -- Put this in startup file: os.loadAPI("/monitorScreen")
    shell.run("delete /monitorScreen")
    shell.run("pastebin get SeNab0j9 /monitorScreen")
    term.clear()
    term.setCursorPos(1,1)
    term.write('Put this in startup file:')

    term.setCursorPos(1,3)
    term.write('os.loadAPI("/monitorScreen")')
    term.setCursorPos(1,4)
    return
end

local monitors_selectedLine = {}
local monitors = monitorScreen.getMonitors()

function drawMonitor(monitor_name)
    local monitor = peripheral.wrap(monitor_name)
    local id = monitorScreen.getMonitorID(monitor_name)

    monitor.setBackgroundColor(colors.black)
    monitor.setTextColor(colors.white)
    monitor.setTextScale(2)

    monitor.clear()
    monitor.setCursorPos(1,1)

    monitor.write("Screen name: "..monitor_name)

    monitor.setCursorPos(1,2)
    monitor.write("Current screen: "..id)

    monitor.setCursorPos(1,4)
    monitor.write("Screen selection:")

    for i=1, #monitors, 1 do
        monitor.setCursorPos(1,i+5)
        if (id==i) then
            monitor.setBackgroundColor(colors.green)
            monitor.write("Active  : Screen "..i)
        else
            if (monitors_selectedLine[monitor_name] == nil) then
                monitor.setBackgroundColor(colors.black)
                monitor.write("Select  : Screen "..i)
            else
                if monitors_selectedLine[monitor_name] == i then
                    monitor.setBackgroundColor(colors.orange)
                    monitor.write("Selected: Screen "..i)
                else
                    monitor.setBackgroundColor(colors.black)
                    monitor.write("Select  : Screen "..i)
                end
            end
        end
    end


    monitor.setTextColor(colors.white)

    if monitors_selectedLine[monitor_name] == nil then
        monitor.setBackgroundColor(colors.green)
        monitors_selectedLine[monitor_name] = id
    else
        if monitors_selectedLine[monitor_name] == id then
            monitor.setBackgroundColor(colors.green)
        else
            monitor.setBackgroundColor(colors.orange)
        end
    end

    monitor.setCursorPos(20,2)
    monitor.write("[SAVE]")

    monitor.setBackgroundColor(colors.black)
end

for _, monitor_name in pairs(monitors) do
    drawMonitor(monitor_name)
end

while true do
    local event, monitor, x, y = os.pullEvent()
    if (event == "monitor_touch") then
        if ((y > 5) and (y<=#monitors+5)) then
            monitors_selectedLine[monitor] = y-5
            drawMonitor(monitor)
        end

        if (y==2) then
            if ((x>=20) and (x<=25)) then
                monitorScreen.setMonitorID(monitor, monitors_selectedLine[monitor])
                drawMonitor(monitor)
            end
        end
    end
end