AR Controller programm.

.lua

if #arg < 1 then
    error("Missing argument: File path")
end
 
filePath = arg[1]
if not fs.exists(filePath) then
    error("File not found.")
end
file = fs.open(filePath, "r")
 
width = 0
height = 0
repeat
    line = file.readLine()
    if line ~= nil then
        if #line > width then
            width = #line
        end
        height = height + 1
    end
until line == nil
 
controller = peripheral.find("arController")
if controller == nil then
    error("Controller not found.")
end
controller.setRelativeMode(true, width, height)
 
os.run({}, "ar_paint.lua", filePath, 0, 0, width, height)