Search vim help with K.

vimrc-ref.vim

let g:ref_no_default_key_mappings = 1
nnoremap <silent> K :<C-u>call Ref('normal')<CR>
vnoremap <silent> K :<C-u>call Ref('visual')<CR>

function! Ref(mode)
    if &filetype ==# 'vim'
	execute 'silent! help ' . expand("<cword>")
	"execute 'help index| tj /' . expand("<cword>")
	if &filetype !=# 'help'
	    echo 'No entry'
	endif
    else
	call ref#K(a:mode)
    endif
endfunction