Tab through partial HLS

better_inc_search.vim

" Tab to cycle through instances of partially complete search pattern {{{
set wildcharm=<Tab>
cnoremap <expr> <Tab>   BetterIncSearch('tab')
cnoremap <expr> <S-Tab> BetterIncSearch('stab')

" better incremental search
function! BetterIncSearch(key) abort
if getcmdtype() ==# '/' || getcmdtype() ==# '?'
    if (a:key ==# 'tab' && v:searchforward) || (a:key ==# 'stab' && !v:searchforward)
      return "\<CR>/\<C-r>/"
    else
      return "\<CR>?\<C-r>/"
    endif
  else
    if a:key ==# 'tab'
      return "\<Tab>"
    else
      return "\<S-Tab>"
    endif
  endif
endfunction
" }}}