os_utils

function midpoint(width, height)
    local x = math.floor(width / 2)
    local y = math.floor(height / 2)

    return x, y
end

function getXPosOfString(str, startX)
    local length = string.len(str)
    local midpoint
    if length % 2 == 0 then
        -- Accept that the string can't be centered on a single character, so generate a best guess
        midpoint = length / 2
    else
        -- The string can be centered on a single character, so select that character
        midpoint = math.floor(length / 2) - 1
    end
    return startX - midpoint
end

function hasKey(table, key)
    for k,v in pairs(table) do
        if k == key then
            return true
        end
    end

    return false
end

return { midpoint = midpoint, hasKey = hasKey, getXPosOfString = getXPosOfString }