local t = turtle

blacklist = {}

local function blacklisted (what)
  for _, b in ipairs(blacklist) do
    if string.match(what, b) then
      return true
    end
  end
  return false
end

-- FIXME
local function digAround ()
  return false
end

function hook ()
  if t.digsafe then return false end

  t.digsafe = {}
  for i, d in pairs({
    ["inspectUp"] = "digUp",
    ["inspectDown"] = "digDown"
  }) do
    t.digsafe[d] = t[d]
    t[d] = function ()
      local x, y = t[i]()
      if not x then return false end
      if blacklisted(y["name"]) then
        return false
      end
      return t.digsafe[d]()
    end
  end

  t.digsafe.dig = t.dig
  t.dig = function ()
    local x, y = t.inspect()
    if not x then return false end
    if blacklisted(y["name"]) then
      return digAround()
    end
    return t.digsafe.dig()
  end

  return true
end