t = {
    {text = "Button 1", x = 1, y = 1, txtCol = colours.red, bgCol = colours.lime},
    {text = "Button 2", x = 1, y = 2, txtCol = colours.red, bgCol = colours.lime},
    {text = "Button 3", x = 1, y = 3, txtCol = colours.red, bgCol = colours.lime}
}


mon = peripherial.wrap("side")

function writeButtons(_table)
    for i, v in pairs(_table) do
        term.setCursorPos(v.x, v.y)
        term.setTextColour(v.txtCol)
        term.setBackgroundColour(v.bgCol)
        write(v.text)
    end
end

function isValidClick(_table, mx, my)

    for i, v in pairs(_table) do
        if mx >= v.x and mx <= (v.x + #v.text) and my == v.y then
             return true, v.text
        end
    end
    return false, nil
end

writeButtons(t)

while true do
    _, but, x, y = os.pullEvent("monitor_touch")
    bClick, option = isValidClick(t, x, y)
    if bClick then
    -- Yes, it's a valid click. Now let's do something with the returned text 'option'
    if option == "Button 1" then -- button 1...

    elseif option == "Button 2" then

    elseif option == "Button 3" then

    end
end