local infile = App.open_for_reading(App.save_dir..filename)
  if not infile then
    infile = App.open_for_reading(App.source_dir..filename)
  end
-- the source editor supports only files in the save dir backed by the source dir
  local infile = App.open_for_reading(App.save_dir..State.filename)
  if not infile then
    infile = App.open_for_reading(App.source_dir..State.filename)
  end
  local outfile = App.open_for_writing(App.save_dir..State.filename)
  if outfile == nil then
    error('failed to write to "'..State.filename..'"')
  end
  for _,line in ipairs(State.lines) do
  State.lines = load_from_file(infile)
  if infile then infile:close() end
end
function load_from_file(infile)
  local result = {}
  if infile then
    local infile_next_line = infile:lines()  -- works with both Lua files and LÖVE Files (https://www.love2d.org/wiki/File)
    while true do
      local line = infile_next_line()
      if line == nil then break end
function load_from_disk(State)
  if infile then
    infile:close()
    return true
  else
    return false
  end
end

      App.set_clipboard(s)
      App.set_clipboard(s)
    local clipboard_data = App.get_clipboard()
    for _,code in utf8.codes(clipboard_data) do
      local c = utf8.char(code)
      if c == '\n' then
        Text.insert_return(State)
      else
        Text.insert_at_cursor(State, c)
      end
    end
    if Text.cursor_out_of_screen(State) then
      Text.snap_cursor_to_bottom_of_screen(State, State.left, State.right)
    end
    schedule_save(State)
    record_undo_event(State, {before=before, after=snapshot(State, before_line, State.cursor1.line)})
    end
    schedule_save(State)
  elseif chord == 'C-v' then
    for _,line_cache in ipairs(State.line_cache) do line_cache.starty = nil end  -- just in case we scroll
    -- We don't have a good sense of when to scroll, so we'll be conservative
    -- and sometimes scroll when we didn't quite need to.
    local before_line = State.cursor1.line
    local before = snapshot(State, before_line)
    end
  elseif chord == 'C-x' then
    for _,line_cache in ipairs(State.line_cache) do line_cache.starty = nil end  -- just in case we scroll
    local s = Text.cut_selection(State, State.left, State.right)
    if s then

end
-- tests will be able to move the time back and forwards as needed using
-- App.wait_fake_time below.

-- If you access the time using App.getTime instead of love.timer.getTime,

-- If you access the time using App.get_time instead of love.timer.getTime,

  App.open_for_reading = function(filename) return io.open(filename, 'r') end
  App.open_for_writing = function(filename) return io.open(filename, 'w') end

  App.open_for_reading =
      function(filename)
        local result = nativefs.newFile(filename)
        local ok, err = result:open('r')
        if ok then
          return result
        else
          return ok, err
      end
  App.open_for_writing =
      function(filename)
        local result = nativefs.newFile(filename)
        local ok, err = result:open('w')
        if ok then
          return result
        else
          return ok, err
      end
  App.files = nativefs.getDirectoryItems
  App.source_dir = love.filesystem.getSource()..'/'
  App.current_dir = nativefs.getWorkingDirectory()..'/'
  App.save_dir = love.filesystem.getSaveDirectory()..'/'
  App.get_time = love.timer.getTime
  App.get_clipboard = love.system.getClipboardText
  App.set_clipboard = love.system.setClipboardText

        end

        end