neovim/runtime/ftplugin/sass.vim

" Vim filetype plugin
" Language:	Sass
" Maintainer:	Tim Pope <vimNOSPAM@tpope.org>
" Last Change:	2019 Dec 05

" Only do this when not done yet for this buffer
if exists("b:did_ftplugin")
  finish
endif
let b:did_ftplugin = 1

let b:undo_ftplugin = "setl com< cms< def< inc< inex< ofu< sua<"

setlocal comments=://
setlocal commentstring=//\ %s
setlocal includeexpr=SassIncludeExpr(v:fname)
setlocal omnifunc=csscomplete#CompleteCSS
setlocal suffixesadd=.sass,.scss,.css
if &filetype =~# '\<s[ac]ss]\>'
  setlocal iskeyword+=-
  setlocal iskeyword+=$
  setlocal iskeyword+=%
  let b:undo_ftplugin .= ' isk<'
endif

let &l:define = '^\C\v\s*%(\@function|\@mixin|\=)|^\s*%(\$[[:alnum:]-]+:|[%.][:alnum:]-]+\s*%(\{|$))@='
let &l:include = '^\s*@import\s\+\%(url(\)\=["'']\='

function! SassIncludeExpr(file) abort
  let partial = substitute(a:file, '\%(.*/\|^\)\zs', '_', '')
  if !empty(findfile(partial))
    return partial
  endif
  return a:file
endfunction

" vim:set sw=2: