nnn/scripts/vim-plugin/nnn-picker.vim

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" vim/neovim plugin to use nnn as a file picker
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" Closely follows and inspired by the vim_file_chooser plugin for ranger.
"
" Author: Arun Prakash Jana
" Email: engineerarun@gmail.com
" Homepage: https://github.com/jarun/nnn
" Copyright © 2018 Arun Prakash Jana
"
" Usage:
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" Copy this file to the vim/neovim plugin directory.
" To open nnn as a file picker in vim/neovim, use the command ":NnnPicker" or
" ":Np" or the key-binding "<leader>n". Once you select one or more files and
" quit nnn, vim/neovim will open the first selected file and add the remaining
" files to the arg list/buffer list. If no file is explicitly selected, the
" last selected entry is picked.
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let s:temp = ""
fun! s:T_OnExit(job_id, code, event) dict
if a:code == 0
bd!
call s:evaluate_temp()
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endif
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endfun
fun! s:evaluate_temp()
if !filereadable(s:temp)
echoerr 'Temp file ' . s:temp . 'not readable!'
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redraw!
" Nothing to read.
return
endif
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let names = readfile(s:temp)
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if empty(names)
redraw!
" Nothing to open.
return
endif
" Edit the first item.
exec 'edit ' . fnameescape(names[0])
" Add any remaining items to the arg list/buffer list.
for name in names[1:]
exec 'argadd ' . fnameescape(name)
endfor
redraw!
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endfun
function! NnnPicker()
let s:temp = tempname()
let l:cmd = 'nnn -p ' . shellescape(s:temp)
if has("nvim")
enew
call termopen(l:cmd, {'on_exit': function('s:T_OnExit')}) | startinsert
elseif has("gui_running")
exec 'silent !xterm -e ' . l:cmd
call s:evaluate_temp()
else
exec 'silent !' . l:cmd
call s:evaluate_temp()
endif
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endfunction
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command! -bar NnnPicker call NnnPicker()
nnoremap <leader>n :<C-U>NnnPicker<CR>
command! -nargs=* -complete=file Np :call NnnPicker()