Change Vim Font Size Depending on Screen Size

gistfile1.vim

" Set font size based on screen size. When vertical height is greater than 800
" (i.e. an external monitor is attached on a regular 13" MBP), use 18, else use 16.
if has('mac')
  if system("osascript -e 'tell application \"Finder\" to get bounds of window of desktop' | cut -d ',' -f 4 | xargs") > 800
    set guifont=Inconsolata\ for\ Powerline:h18
  else
    set guifont=Inconsolata\ for\ Powerline:h16
  endif
endif