osutils.lua

local w,h = term.getSize()
crash = function(reason)
  if type(reason) ~= "string" then
    error("String excepted, got "..type(reason))
  end
  term.setBackgroundColor(colors.blue)
  term.setTextColor(colors.white)
  term.clear()
  term.setCursorPos(1,1)
  print("Something goes wrong!")
  print("Reason: "..reason)
  sleep(0.5)
  os.reboot()
end

runCons = function()
  shell.run("fg /sys/apps/console")
end

editWall = function()
  shell.run("fg edit /data/wallpaper")
end

local writeCentered = function(s,y)
  term.setCursorPos(math.floor((w/2)-(string.len(s)/2)),y)
  write(s)
end

local logonBasic = function()
  write("Username: ")
  local usr = read()
  write("Password: ")
  local pas = read("*")
  return usr,pas
end

logon = function()
  local logged = false
  while not logged do
    local user,pass = logonBasic()
    term.setBackgroundColor(colors.blue)
    term.setTextColor(colors.white)
    term.clear()
    term.setCursorPos(1, 1)
    paintutils.drawLine(1,1,w,1,colors.white)
    paintutils.drawLine(1,h,w,h,colors.white)
    term.setBackgroundColor(colors.blue)
    term.setTextColor(colors.white)
    term.setCursorPos(1,2)
    if not fs.isDir("/usr/"..user) then
      printError("Invaild Username!")
    else
      local a = fs.open("/usr/"..user.."/pass","r")
      local uPass = a.readLine()
      a.close()
      if pass ~= uPass then
        printError("Invaild Password!")
      else
        logged = true
        writeCentered("Welcome!",math.floor(h/2))
        sleep(5)
      end
    end
  end
end

formatSize = function(size)
  if type(size) ~= "number" then
    error("Attempt to format size in "..type(size))
  end
  local format = nil
  local sizes = {
    [1] = {symbol="KB",num=1},
    [2] = {symbol="MB",num=2},
    [3] = {symbol="GB",num=3}
  }
  for i=1,#sizes do
    if i==1 then
      if size >= 1000^sizes[i].num then
        format = math.floor(size / (1000^sizes[i].num)) .. " " .. sizes[i].symbol
      end
    else
      if size >= 1000^sizes[i].num and size < 1000^sizes[i-1].num then
        format = math.floor(size / (1000^sizes[i].num)) .. " " .. sizes[i].symbol
      end
    end
  end
  if format == nil then
    format = size.." B"
  end
  return format
end