Start Nvim for Godot; when opening a .gd file in Godot, defer to either a running instance of Neovim if it exists, or a new one.

gvim

#!/usr/bin/env bash

set -euo pipefail

exec 2>>"/tmp/godot-nvim.log"

SOCK="${XDG_RUNTIME_DIR:-/tmp}/godot-nvim.sock"
FILE="${1:-}"
FILE="$(realpath -- "$FILE")"
LINE="${2:-1}"
COL="${3:-1}"

if [ ! -f "$FILE" ]; then
    echo "usage: $(basename "$0") <file> [line] [col]" >&2
    exit 1
fi


nvim_is_alive() {
    [ -S "$SOCK" ] && timeout 1 nvim --server "$SOCK" --remote-expr '1' >/dev/null 2>&1
}

send_to_nvim() {
    nvim --server "$SOCK" --remote-silent "$FILE"
    nvim --server "$SOCK" --remote-send "<C-\\><C-n>:call cursor(${LINE}, ${COL})<CR>zvzz"
}

launch_terminal() {
    local term="${TERMINAL:-}"
    if [ -z "$term" ]; then
        for t in cosmic-term foot kitty alacritty xterm; do
            command -v "$t" >/dev/null 2>&1 && { term="$t"; break; }
        done
    fi
    [ -n "$term" ] || { echo "godot-nvim: no terminal found; set \$TERMINAL" >&2; exit 1; }

    case "$(basename "$term")" in
        kitty|foot)     "$term" nvim --listen "$SOCK" -c 'set title titlestring=GVim' ;;
        *)              "$term" -e nvim --listen "$SOCK" -c 'set title titlestring=GVim' ;;
    esac >/dev/null 2>&1 &
    disown
}

if nvim_is_alive; then
    send_to_nvim
    exit 0
fi

rm -f "$SOCK"
launch_terminal

for _ in $(seq 1 50); do
    nvim_is_alive && break
    sleep 0.1
done

if ! nvim_is_alive; then
    echo "godot-nvim: nvim never started listening on $SOCK" >&2
    exit 1
fi

send_to_nvim