prot - Stupid Lua Program

function displayHelp()
    print("prot <filename>")
end

tArg = {...}

function doIt()
    fileName = tArg[1]
    if protectedFiles == nil then
        protectedFiles = {}
    end
    file = fs.open(fileName, "a")
    table.insert(protectedFiles, fileName)
    fs.open = function(path, mode)
        for a = 1, #protectedFiles do
            if mode == "w" or mode == "wb" or mode == "a" then
                if string.find(protectedFiles[a], path) ~= nil then
                    return false
                else
                    oldFsOpen(path, mode)
                end
            else
                oldFsOpen(path, mode)
            end
        end
    end
end

if tArg[ 1 ] == nil then
    displayHelp()
    return false
else
    doIt()
end