energy.lua

local storages = {
    peripheral.wrap("modular_accumulator_0"),
    peripheral.wrap("modular_accumulator_1")
}
local screen = peripheral.wrap("monitor_0")

term.redirect(screen)
term.clear()

function centerText(text)
    local x, y = term.getSize()
    local x2, y2 = term.getCursorPos()
    term.setCursorPos(math.ceil((x / 2) - (text:len() / 2)), y2)
    screen.write(text)
end

function createProgressBar(storagePercentFormated)
    local fullBarLength = math.floor(storagePercentFormated / 10)
    local progressBar = ""
    for i = 1, fullBarLength do
        progressBar = progressBar .. "#"
    end
    for i = 1, 10 - fullBarLength do
        progressBar = progressBar .. " "
    end
    progressBar = "[" .. progressBar .. "]"
    return progressBar
end

function updateScreen(storage, index)
    screen.setCursorPos(1, 6 + index * 4)
    local storagePercent = storage.getPercent()
    local storageCapacity = storage.getCapacity()
    local storagePercentFormated = tonumber(string.format("%.1f", storagePercent))
    centerText("[[ Battery "..index.." ]]")
    screen.setCursorPos(1, 7 + index * 4)
    if (storagePercent >= 75) and (storagePercent <= 100) then
        screen.setTextColor(32)
    elseif (storagePercent >= 50) and (storagePercent < 75) then
        screen.setTextColor(16)
    elseif (storagePercent >= 0) and (storagePercent < 50) then
        screen.setTextColor(16384)
    end
    centerText(createProgressBar(storagePercentFormated.."  "..storagePercentFormated.."%"))
end

while true do
    for index, storage in ipairs(storages) do
        updateScreen(storage, index)
    end
    sleep(0.5)
end