this may be relevant: https://github.com/willothy/flatten.nvim

Oh shit, the following is not what you wanted it seems. This is for opening a normal file, not integrating git with neovim in that fashion. Apologies, but no. This would be possible to create, and might exist for git, but that would have to be created per command. One would have to make a new command that opened a file up, let you write out your commit, and then took from that temp file piping your message to the commit like fugitive did. Apologies, I'll leave this up though incase anyone else finds it useful

Failed answer

Yup, all is possible with a little bit of know how and skill. It's a bit inconvienient though. Simple solution is at the end, but heres a full explanation:

full explination

First, you have to know what server you're attached to. This can be done with :echo v:servername or listing /run/user/1000/nvim* if you only have one open. The files named nvim.some-numbers will be your running servers.

Then, you simply run the command nvim --server /run/user/1000/nvim.[server].0 --remote-send "<c-\><c-n><ESC>:e [file-path]<cr>" This will exit terminal mode (cntrl+\cntrl+n), exit any other mode (<esc>), enter command mode (:), then send the command to edit the vile. Ex: :e ~/cheatsheat.txt. (<cr> is the enter key. Think of this as remotely typing in each character, with anything in angle brackets being a special character)

This can be made easier though if you launch nvim with the command nvim --listen ~/.cache/nvim/server.pipe or nvim --listen ~/.nvim-server.pipe for easier usage with one file. This way the command will always be nvim --server ~/cache/nvim/server.pipe --remote-send "<c-\><c-n><ESC>:e [file-path]<cr>" and an alias can be created like this: alias svnvim="nvim --server ~/cache/nvim/server.pipe".

If you then add the remapping tnoremap <ESC> <c-\><c-n> the command in terminal mode shrinks to ````svnvim --remote-send "<ESC>:e [file-path]<cr>"The full command that worked for me:nvim --server /run/user/1000/nvim.78931.0 --remote-send "<ESC>:e ~/msg.md<cr>"``

You could simplify this further with a script taking one parameter, concatenating "nvim --server ~/cache/nvim/server.pipe --remote-send "<esc>:e" the file name and "<cr>`" but I'm too lazy to do this right now.

Bash Script

Nevermind, that was incredibly easy. When opening nvim with the --listen ~/server.pipe flag, this will work:

#!/bin/sh

eval 'nvim --server ~/server.pipe --remote-send "<c-\><c-n><esc>:e ${1}<cr>"'

Put that in a file, perhaps called opnvim, place that into a folder in your path, and there you go. That command is now opnvim [filename]

huh, that's neat. It's a one liner, and if I get a bit less lazy I'll add in the ability to automatically find all nvim servers and send the command.

Simpler answer

To simplify, with the following aliases in your .bashrc:

alias nvim="nvim --listen ~/.cache/nvim/server.pipe
alias svnvim="nvim --server ~/cache/nvim/server.pipe"

and then the following remapping in your init.vim:

tnoremap <ESC> <c-\><c-n>

you'll only deed to run svnvim --remote-send "<esc>:e filename<cr> in the terminal to open it in nvim as a new buffer. Or, look at the "Bash Script" section for a more concise method

Relevent Docs

https://neovim.io/doc/user/remote.html

https://neovim.io/doc/user/starting.html#--listen

Post Notes

It's likely possible to fix this up and make it more automatic. Tmux has a tool called tmux-open-nvim which is pretty nice. you only need to run ton ~/msg.md in order for it to work so I'd look at this small script if you wanted to try your hand at making this esier. That will work if you're willing to move away from nvim as your terminal however.

:tabnew would open a new tab inside the existing instance, you can also use vsplit and split for a split inside the current tab.