heavim/cfg/05-visible-whitespace.vim

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" Trailing spaces and visible tabs
"
" Trailing spaces are visible in normal or visual mode, but hidden in insert
" mode. All whitespace can be made visible using <Leader>ow
let s:Settings = {
\ 'tab' : [ " " , "» " ] ,
\ 'nbsp' : [ " " , "⚠" ] ,
\ 'space' : [ " " , "·" ] ,
\ 'eol' : [ " " , "¶" ] ,
\ }
let s:VisibleTabs = 0
function! s:UpdateListChars(type,value)
let lc = filter( split( &l:listchars , "," ) , "v:val !~ '^" . a:type . ":'" ) + [ a:type . ":" . a:value ]
let &l:listchars = join( lc , "," )
endfunction
function! s:ApplyWhitespaceSettings()
for k in keys(s:Settings)
call s:UpdateListChars( k , s:Settings[k][s:VisibleTabs] )
endfor
endfunction
function! <SID>ToggleVisibleWhitespace()
let s:VisibleTabs = 1 - s:VisibleTabs
call s:ApplyWhitespaceSettings()
endfunction
set list
set listchars=""
call s:ApplyWhitespaceSettings()
nnoremap <silent> <Leader>ow :call <SID>ToggleVisibleWhitespace()<cr>
augroup TrailingWhitespace
autocmd!
autocmd InsertEnter * :call <SID>UpdateListChars( "trail" , " " )
autocmd InsertLeave * :call <SID>UpdateListChars( "trail" , "•" )
augroup END