local oldprint = print
function print(t, x, y, col1, col2)
  if col2 then
    for i = -1, 1 do
      for j = -1, 1 do
        oldprint(t, x + i, y + j, col2)
      end
    end
  end
  return oldprint(t, x, y, col1)
end

function str_width(str)
  return print(str, 0, -8)
end

function print_shade(t, x, y, col1, col2)
  print(t, x, y + 1, col2)
  print(t, x + 1, y + 1, col2)
  print(t, x, y, col1)
end

function set_state(state, ...)
  local args = { ... }
  if gs and gs._leave then gs._leave() end
  gs = state
  if gs and gs._enter then gs._enter(unpack(args)) end
end

--
-- Returns the indices of found occurences of `o` within `tbl`
--
function find(tbl, o)
  local indices = {}
  for k, v in ipairs(tbl) do
    if v == o then add(indices, k) end
  end
  return indices
end

function contains(tbl, o)
  for v in all(tbl) do
    if v == o then return true end
  end
  return false
end
--
-- Makes a shallow table copy
--
function copy(tbl)
  return map(tbl, function(o) return o end)
end

--
-- Table equality - shallow comparison
--
function equal(tbl1, tbl2)
  for k, _ in ipairs(tbl1) do
    if tbl1[k] ~= tbl2[k] then return false end
  end
  return true
end