vim/autoload/option/item.vim


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function! option#item#Escape(item, ...) abort
  if a:0 > 1
    echoerr 'Too many arguments'
  endif
  let item = a:item
  let wild = a:0 ? a:1 : 0
  if wild
    let item = substitute(item, '\\,', ',', 'g')
  endif
  return escape(item, ',')
endfunction