Open multiple files in NERDTree at once with Visual selection and [NERDTree defaults] o, i, s, and t.

nerdtree.vim

" Filename:  ~/.vim/ftplugin/nerdtree.vim
" Purpose: Given a Visual-Line selection in the NERDTree buffer, this code
" lets you open all selected files with the same key mappings, which, by
" default, are:
"   o - open files in previous window
"   i - open files in horizontally split windows
"   s - open files in vertically split windows
"   t - open files in new tabs

execute "vnoremap <buffer> " . g:NERDTreeMapActivateNode . " :call <SID>OpenMultiple('p')<CR>"
execute "vnoremap <buffer> " . g:NERDTreeMapOpenSplit . " :call <SID>OpenMultiple('h')<CR>"
execute "vnoremap <buffer> " . g:NERDTreeMapOpenVSplit . " :call <SID>OpenMultiple('v')<CR>"
execute "vnoremap <buffer> " . g:NERDTreeMapOpenInTab . " :call <SID>OpenMultiple('t')<CR>"

function! s:OpenMultiple(target) range
    let curLine = a:firstline
    while curLine <= a:lastline
        call cursor(curLine, 1)
        let node = g:NERDTreeFileNode.GetSelected()
        call nerdtree#echo("Opening " . (curLine - a:firstline + 1) . " of " . (a:lastline - a:firstline + 1) . "...")
        if !empty(node) && !node.path.isDirectory
            call node.open({'where':a:target, 'stay':1, 'keepopen':1})
        endif

        let curLine += 1
    endwhile
    if g:NERDTreeQuitOnOpen
        NERDTreeClose
    endif
    call nerdtree#echo("")
endfunction

Sorry I took a look at Xuyuanp/nerdtree-git-plugin (Which I always used) and saw that plugins for NERDTree are being wrote like I just said 😥 . But in this approach changed from ~/.vim/nerdtree_plugin to ~/.vim/ftplugin/nerdtree.vim/. Does this still count as a candidate for a nerdtree_plugin ?

By the way it works nice 👌

Switching to the ftplugin folder allowed me to remove the augroup code, where the BufNew wasn't working in all cases, and BufEnter ran more often than needed. Plugins can have any folder structure that they need. While it no longer is in the nerdtree_plugin folder, it's still a plugin that would be dependent on NERDTree being installed. I will create a plugin that works with plugin managers, adding some new functionality.

This gist is now available as a standard Vim plugin here: https://github.com/PhilRunninger/nerdtree-visual-selection