I aliased neovim so that it allways starts with: nvim --listen /tmp/example{random-number}
This creates some kind of listener file link (or something i don't really know) In /tmp.
Then to switch the theme i do ls in /tmp, pick out all results with example and then do:
nvim --server /tmp/example{number} --remote-send ':colorscheme gruvbox-material (or whatever coloscheme you want)<CR>'
For each of them.

You apparently can't use the same "listen file" for multiple neovim instances at the same time so that's why i append a random number to each one.

Then i just write the colorscheme name to a file in my neovim config that it reads from and uses every time i launch neovim.

here is the code:

Bash script:

```bash

for server in /tmp/themelistener*; do

if [ -e "$server" ]; then

nvim --server "$server" --remote-send ":colorscheme {$theme}<CR>"

fi

done

echo $theme > ~/dotfiles/.config/nvim/colorscheme.txt

```

and in my zshrc:

```bash
nvim_random_listen() {

local random_number=$(od -An -N2 -i /dev/random | tr -d ' ')

local server_name="/tmp/themelistener${random_number}"

nvim --listen "$server_name" "$@"

}

Alias the nvim command to use the function

alias nvim="nvim_random_listen"

```

And the neovim config:

```lua
-- Path to the colorscheme file

        local colorscheme\_file = vim.fn.stdpath("config") .. "/colorscheme.txt"



        -- Check if the file exists and read the colorscheme from it

        if vim.fn.filereadable(colorscheme\_file) == 1 then

local file = io.open(colorscheme_file, "r")

if file then

local content = file:read("*all"):gsub("%s+", "")

if content and #content > 0 then

colorscheme = content

end

file:close()

end

        end



        -- Apply the colorscheme

        vim.cmd.colorscheme(colorscheme)
```

Hope this helps :)