[OpenComputers] robotrader

local trading = require("component").trading
local cls = require("term").clear
local E = require("event")
local s, e, i, o = 1
local t = trading.getTrades()

if t.n == 0 then
  print("I don't see the villagers.")
  os.exit()
end

while true do
  t = trading.getTrades()
  if t[s].isEnabled() then
    cls()
    print("#"..s)
    o, i, i2 = t[s].getOutput(), t[s].getInput()
    print("You:      "..i.label.." ["..i.size.."]")
    if i2 then
      print("          "..i2.label.." ["..i2.size.."]")
    end
    print("\nVillager: "..o.label.." ["..o.size.."]")
    if o.enchantments then
      for k = 1, #o.enchantments do
        print("\t", o.enchantments[k].label)
      end
    end
  end
  e = {E.pull("key_down")}
  if e[4] == 200 then
    if s == t.n then
      s = 1
    else
      s = s + 1
    end
  elseif e[4] == 208 then
    if s == 1 then
      s = t.n
    else
      s = s - 1
    end
  elseif e[4] == 28 then
    print(t[s].trade())
    E.pull("key_down")
    t = trading.getTrades()
  else
    os.exit()
  end
end