rel, start_id = string.match(column_name, '(%S+) from (%S+)')

    local rel, start_id = string.match(column_name, '(%S+) from (%S+)')

  elseif string.match(column_name, 'neighbors of %S+') then
    local start_id = string.match(column_name, 'neighbors of (%S+)')
    initialize_cache_if_necessary(start_id)
    local column = {name=('neighbors of %s'):format(start_id)}
    table.insert(column, load_pane_from_file(start_id))
    for rel,target in pairs(Cache[start_id].links) do
      table.insert(column, load_pane_from_file(target))
    end
    table.insert(Surface, column)

    'neighbors (open all links in new column)',

    'neighbors (open all links in new column)',

  elseif cmd == 'neighbors' then
    command.neighbors()

function command.neighbors()
  local pane = Surface[Cursor_pane.col][Cursor_pane.row]
  local column = {name=('neighbors of %s'):format(pane.id)}
  table.insert(column, load_pane_from_file(pane.id))
  for rel,target in pairs(Cache[pane.id].links) do
    table.insert(column, load_pane_from_file(target))
  end
  if #Surface[Cursor_pane.col] == 1 then
    assert(Cursor_pane.row == 1)
    Surface[Cursor_pane.col] = column
  else
    table.insert(Surface, Cursor_pane.col+1, column)
    Cursor_pane.col = Cursor_pane.col+1
    Cursor_pane.row = 1
  end
  bring_cursor_column_on_screen()
  update_pane_bounds()
end