:NERDTreeFind for newly created and yet unsaved files

[mgedmin]

Description

It would be rad if :NERDTreeFind would open NERDTree and focus on the parent directory when I run it in a buffer that has a new file that doesn't yet exist on disk.

Elaboration

I have several custom commands :EditFiletypePlugin, :EditSyntaxPlugin, :EditIndentPlugin that open my local ~/.vim/{ftplugin,syntax,indent}/&ft.vim. Sometimes there's no local plugin for this filetype, but vim's global one includes a different (like syntax/git.vim includes syntax/diff.vim), and I have a local override for that one.

So when I :EditSyntaxPlugin and I get a new file ~/.vim/syntax/git.vim, but I want to instead edit ~/.vim/syntax/diff.vim (which exists), I try to use :NERDTreeFind so I could look at the files in the same folder.

Unfortunately :NERDTreeFind tells me "NERDTree: invalid path".

I could do :NERDTreeFind %:h, but

• I have a mapping f for :NERDTreeFind, and I'd have to come up with a different key for the :%h variation (or construct elaborate mappings that check for the existence of the file, hmmm)
• I would like NERDTree to also open the directory and show me what's inside, which the %:h version doesn't currently do

[mgedmin]

Thank you!

[sou-long]

If file path doesn't exist, :NERDTreeFind its parent directory instead

This still errs on empty unnamed buffers (new tabs, diffs, etc). I wanted NERDTreeFind to fallback to NERDTree in any case, so I came up with this snippet:

nmap <mykey> :call NERDTreeFindOrOpen()<CR>

function! NERDTreeFindOrOpen()
    if &modifiable && !empty(expand('%:p'))
        NERDTreeFind
    else
        NERDTree
    endif
endfunction

• &modifiable makes it ignore help/etc buffer paths
• %:p means file path
• You may experiment with NERDTreeFocus or NERDTreeVCS instead of NERDTree

Feel free to adjust and use!