Change vim settings settings based on power status

.vimrc

" requires vim 8 for timer support

function! UpdatePowerSaving(timerId)
  if executable('pmset')
    call system("pmset -g batt | head -1 | grep 'Battery'")
    if !v:shell_error
      " on battery
      let g:ale_lint_delay=10000
    else
      " power adapter
      let g:ale_lint_delay=200
    endif
  endif
endfunction

call UpdatePowerSaving(0)
let powerTimer=timer_start(10000, "UpdatePowerSaving")