ref: 2a83ebb7dc6f8f719e2018df7a3a6b090e6541c9
dir: /lib/vimfiles/syntax/whitespace.vim/
" Simplistic way to make spaces and Tabs visible " This can be added to an already active syntax. syn match Space " " syn match Tab "\t" if &background == "dark" hi def Space ctermbg=darkred guibg=#500000 hi def Tab ctermbg=darkgreen guibg=#003000 else hi def Space ctermbg=lightred guibg=#ffd0d0 hi def Tab ctermbg=lightgreen guibg=#d0ffd0 endif