Colored book selector

local list = { --This contains the numbers and colors. You can extend this to as long as you'd like - it's not hardcoded anywhere else
    [1] = colors.blue,
    [2] = colors.yellow,
    [3] = colors.white,
    [4] = colors.green,
    [5] = colors.red
}

local function drawList(selected, offX, offY) --This function will draw the list with the selected item at the given offsets
    for i=1,#list do
        term.setCursorPos(offX, offY)
        term.setTextColor(list[i])
        if i==selected then
            term.write("["..i.."]")
        else
            term.write(" "..i.." ")
        end
        offY=offY+1
    end
end

local function run() --This just captures key presses and adds or subtracts from the selected variable depending on the key event. If the user presses enter, it returns true
    while true do
        local startX, startY = 3,3
        local selected = 1
        while true do
            drawList(selected, startX, startY)
            local e = {os.pullEvent()}
            if e[1] == "key" then
                if e[2] == keys.up then
                    selected = selected>1 and selected - 1 or selected
                elseif e[2] == keys.down then
                    selected = selected<#list and selected+1 or selected
                elseif e[2] == keys.enter then
                    return selected
                end
            end
        end
    end
end

while true do --The main loop.
    local result = run()
    --Now you've got the result in number format. I'm not sure what you were trying to do with the book function, but I can imagine that you'll be able
    --to use this now. If you need the actual color value instead of the number, you can just use list[result] and it will give you the color.
end