.vimrc

function! AdjustToLight()
  let lightFile = "/sys/devices/platform/applesmc.768/light"
  for line in readfile(lightFile, '', 1)
    let line = substitute(line, '[()]', '', '')
    let parts = split(line, ',')
    let light = parts[0]
    if light > 150
      if g:colors_name != "Tomorrow"
        silent! colorscheme Tomorrow
      endif
    else
      if g:colors_name != "Tomorrow-Night"
        silent! colorscheme Tomorrow-Night
      endif
    endif
  endfor
endfunction
augroup Light
  autocmd!
  autocmd CursorHold,CursorHoldI,CursorMoved,CursorMovedI * call AdjustToLight()
augroup END

README.md

AdjustToLight

Adjust your vim color scheme to a light one when it's bright outside! This only works if your running Linux on your Macbook, I think.

Install this:

https://github.com/chriskempson/vim-tomorrow-theme

Then place the above code in your .vimrc