Snipets for opencomputers

snipets.lua

--This file is parts of different codes for different tasks
local cmp = require("component")

--get information from gt_batterybuffer
local current, total = 0, 0
local bb = cmp.proxy(--[[bbaddr]])
local current = current + string.gsub(bb.getSensorInformation()[3], "([^0-9]+)", "")
local total = total + string.gsub(bb.getSensorInformation()[4], "([^0-9]+)", "")

--get information from multiple gt_batterybuffer
--init
local current, total = 0, 0
--main
current, total = 0, 0
for bbaddr in pairs(cmp.list("gt_batterybuffer")) do
	local bb = cmp.proxy(bbaddr)
	current = current + string.gsub(bb.getSensorInformation()[3], "([^0-9]+)", "")
	total = total + string.gsub(bb.getSensorInformation()[4], "([^0-9]+)", "")
end

--get a percentage of the computer's remaining energy
local persent = computer.energy() / computer.maxEnergy() * 100

--check file list on exist
local filesTable = {
    "/a",
    "/b",
    "/c"
}

local exists = {}
for _, file in pairs(filesTable) do
    if fs.exists(file) then
        table.insert(exists, file)
    end
end

--detect error and print message
local success, message = fs.remove(file)
if not success then
        io.stderr:write("Cannot delete this file: "..file.." by reason: "..message)
end

--write once and close
io.open(filePath, "w"):write(""):close()

--read all file
io.open(filePath, "r"):read("*a")

--dump file into chatbox(run via lua cmd)
handler = io.open("/home/1", "r")
for value in handler:lines("l") do    component.chat_box.say(value) end

--mikro direction library for drone
local drone = component.proxy(component.list("drone")())

local direction = 1     --1 - 4
local function turnRight()
    direction = direction + 1
    if direction > 4 then
        direction = 1
    end
end

local function turnLeft()
    direction = direction - 1
    if direction < 1 then
        direction = 4
    end
end

local function forward(step)
    if direction == 1 then
        drone.move(step, 0, 0)
    elseif direction == 2 then
        drone.move(0, 0, step)
    elseif direction == 3 then
        drone.move(-step, 0, 0)
    elseif direction == 4 then
        drone.move(0, 0, -step)
    end
end