set rtp+=~/work/ddu.vim
set rtp+=~/work/ddu-ui-ff
set rtp+=~/work/denops.vim
set rtp+=~/work/ddu-source-file_rec
cd ~/src/vim
call ddu#custom#patch_global('ui', 'ff')
nnoremap a <Cmd>call ddu#start(#{sources: [#{name: 'file_rec'}]})<CR>
autocmd FileType ddu-ff call s:ddu_ff_my_settings()
function s:ddu_ff_my_settings() abort
nnoremap <buffer> q
\ <Cmd>call ddu#ui#do_action('quit')<CR>
endfunction
Minimal vimrc
To reproduce: