Config file in a symlinked folder not properly recognized when calling UltiSnips Edit

[ludovicschwartz]

When the .snippets filed are stored in a symlinked folder, calling :UltiSnipsEdit returns the following error :
UltiSnips was not able to find a default directory for snippets. Do any of ['/home/user/.config/nvim', '/home/user/.vim'] exist AND contain any of the folders in g:UltiSnipsSnippetDirectories ? With default vim settings that would be: ~/.vim/UltiSnips Try :UltiSnipsEdit! instead of :UltiSnipsEdit.
The snippets themselves work just fine.

Expected behavior:
The symlinked file all.snippets (or the file corresponding to the type of document being edited) is opened by neovim

Actual behavior:
An error message appears

Steps to reproduce

• Store the config of UltiSnips in /PathToConfig/UltiSnips/all.snippets
• Create a symlink usingln -s /PathToConfig/UltiSnips ~/.config/nvim/UltiSnips
• Launch Neovim
• Run the :UltiSnipsEdit command

.config/nvim/init.vim :

"Vimplug plugins
call plug#begin()
Plug 'Sirver/ultisnips'
" Ultisnip configuration
let g:UltiSnipsExpandTrigger='<tab>'    " use Tab to expand snippets
let g:UltiSnipsJumpForwardTrigger='jk'    " use Tab to move forward through tabstops
let g:UltiSnipsJumpBackwardTrigger='<S-Tab>'  " use Shift-Tab to move backward through tabstops
let g:UltiSnipsSnippetDirectories=[$HOME.'/.config/nvim/UltiSnips',"UltiSnips"]
call plug#end()

---

• Operating System: Ubuntu 20.04
• Vim Version: NVIM 0.9.4

[ludovicschwartz]

Upon further investigation, the error seems to be coming from this piece of code in snippet_manager.py :

has_storage_dir = (
            vim_helper.eval(
                "exists('g:UltiSnipsSnippetStorageDirectoryForUltiSnipsEdit')"
            )
            == "1"
        )

Indeed, doing a :echo exists('g:UltiSnipsSnippetStorageDirectoryForUltiSnipsEdit') returns 0.

Adding this line to the vim/nvim fixed the issue :
let g:UltiSnipsSnippetStorageDirectoryForUltiSnipsEdit=$HOME.'/.config/nvim/UltiSnips'

That being said, the behaviour changed when creating the symlink, and I still don't understand why it stopped working. I'll dig deeper.