EventViewer

function switchColors()
  local alphabet = {"a","b","c","d","e","f"}
  for i,v in pairs(colors) do
    if tonumber(v) then
      res = math.log(v)/math.log(2)
      if res > 9 then
        res = alphabet[res-9]
      end
      colors[i] = tostring(res)
    end
  end
end

function draw(str,xPos,yPos,txtcol,bakcol)
  local str = tostring(str) or ""
  local txtcol = txtcol or colors.white
  local bakcol = bakcol or colors.black
  if xPos and yPos then
    term.setCursorPos(xPos, yPos)
  end
  if term.blit then
    term.blit(str,string.rep(txtcol,#str),string.rep(bakcol,#str))
  else
    term.setBackgroundColor(bakcol)
    term.setTextColor(txtcol)
    term.write(str)
  end
end

if term.blit then
    switchColors()
else
    os.loadAPI(shell.resolve("rom/apis/colors"))
end

while true do
    local events = {coroutine.yield()}
    term.clear()
    draw("EVENTS",1,1,colors.green)
    for i = 1,#events do
      draw(tostring(i).."."..tostring(events[i]),1,i+1,colors.yellow)
    end
end