Automatic search highlighting clearing for Vim

ash.vim

if exists('g:loaded_auto_search_highlighting')
    finish
endif

let g:loaded_auto_search_highlighting = 1

if ! exists('g:auto_search_highlighting')
    let g:auto_search_highlighting = 1
endif

augroup AutoSearchHighlighting
    autocmd!
    autocmd CmdlineEnter /,\? set hlsearch
    autocmd CmdlineLeave /,\?
        \ if g:auto_search_highlighting |
        \     set nohlsearch |
        \ endif
augroup END

command -nargs=0 ToggleAutoSearchHighlighting
    \ let &hlsearch = g:auto_search_highlighting |
    \ let g:auto_search_highlighting = !g:auto_search_highlighting