showscript

-- Usage: show_img <nfp_url> [monitor_side_or_name]
-- Example: show_img https://example.com/picture.nfp right

local args = {...}
if #args < 1 then
  print("Usage: show_img <nfp_url> [monitor_side_or_name]")
  return
end

local url = args[1]
local monId = args[2] -- optional: side ("right") or peripheral name

if not http then
  error("HTTP API is disabled. Enable http.enabled=true in the config.")
end

-- Find monitor
local mon
if monId then
  if peripheral.isPresent(monId) and peripheral.getType(monId) == "monitor" then
    mon = peripheral.wrap(monId)
  else
    error("Monitor not found at '"..monId.."'")
  end
else
  mon = peripheral.find("monitor")
  if not mon then error("No monitor connected.") end
end

-- Download the NFP image to a temp file
local tmpPath = "/.dl_image.nfp"
local function download(url, path)
  local h = http.get(url, {["Cache-Control"]="no-cache"})
  if not h then error("HTTP GET failed for URL: "..url) end
  local data = h.readAll()
  h.close()
  local f = fs.open(path, "w")
  f.write(data)
  f.close()
end

local function drawNfp(path, monitor)
  local img = paintutils.loadImage(path)
  if not img then error("Could not parse NFP image.") end

  monitor.setBackgroundColor(colors.black)
  monitor.clear()
  -- smallest text makes the “pixels” as fine as possible
  monitor.setTextScale(0.5)

  local old = term.redirect(monitor)
  -- Draw at top-left (1,1). No scaling is possible with NFP.
  paintutils.drawImage(img, 1, 1)
  term.redirect(old)
end

-- Main
download(url, tmpPath)
local ok, err = pcall(drawNfp, tmpPath, mon)
if not ok then
  print("Error: "..tostring(err))
else
  print("Image drawn on monitor.")
end
-- Optional: clean up the temp file
-- pcall(fs.delete, tmpPath)