" Invert Vim's built-in logic for choosing dark or light backgrounds; we'll " default to choosing a dark background unless we find some reason *not* to. function! detect_background#DetectBackground() " Split up the value of $COLORFGBG (if any) by semicolons let l:colorfgbg = split($COLORFGBG, ';') " Get the background color value, or an empty string if none let l:bg = len(l:colorfgbg) ? l:colorfgbg[-1] : '' " Choose the background setting based on this value if l:bg ==# 'default' || l:bg ==# '7' || l:bg ==# '15' set background=light else set background=dark endif endfunction