I'd like to be able to open my wiki in a similar way that :vsplit some/file.md
works.
This might be a known issue with some terminals, as seen in this answer.
You can still remap the command if you'd like, for example:
:nmap <Leader>vs <Plug>VimwikiVSplitLink
Or if it does not interfere with your bindings:
:nmap <Leader>vs :VimwikiVSplitLink<CR>
EDIT
Now that I finally understood your request, to launch vimwiki
from vim
in a split you can just chain commands, i.e.:
:sp | :VimwikiIndex
:vs | :VimwikiIndex
This should do the trick.
For remapping, as @DavidVII pointed out, just escape the |
:
nmap <Leader>vs :vs \| :VimwikiIndex<CR>