vim.keymap.set('v', '<M-Enter>', function ()
  local start_pos = vim.fn.getpos('.')
  local end_pos = vim.fn.getpos('v')
  local selection = vim.fn.getregion(
    start_pos,
    end_pos,
    { type = vim.fn.mode() }
  )

  local code = selection[1]
  for i = 2, #selection do
    code = code .. '\n' .. selection[i]
  end

  local tmp = os.tmpname()
  local f = io.open(tmp, 'w')
  f:write(code)
  f:flush()
  f:close()

  vim.system({
    'curl',
    'http://localhost:8000',
    '--data-urlencode',
    'code@' .. tmp
  }):wait()

  os.remove(tmp)
end)