Start LunarVim in Neovide while still being able to pass arguments to each instance individually. Arguments are separated by "--". First half of the arguments are vim arguments, the other half are neovide arguments.

lvide.sh

#!/bin/bash

# find index of $1 in [$2 $3 $4 ...]
function indexof {
    search="$1"; shift
    i=0
    for arg; do
        if [ "$search" = "$arg" ]
        then
            echo $i
            return 0
        fi
        ((i++))
    done
    return 255
}

# find index of "--" in the list of arguments
arg_split_index=$(indexof "--" $@)

# if not present, all args are neovide args
if [ $? -eq 255 ]
then
    arg_split_index=$#
fi

# Split array of args in two
left_args_i=0
left_args_len=$((arg_split_index))

right_args_i=$(($left_args_i+$left_args_len+1))
right_args_len=$(($#-$left_args_len-1))

# Take into account the $0
vim_args=${@:$(($left_args_i+1)):$left_args_len}
neovide_args=${@:$(($right_args_i+1)):$right_args_len}

# Default arguments for vim
# if [ $left_args_len -eq -1 ]
# then
#     vim_args=""
# fi

# Default arguments for neovide
if [ $right_args_len -eq -1 ]
then
    neovide_args="--multigrid"
fi

echo "Neovide args: $neovide_args"
echo "Vim args: $vim_args"

# Prepare to launch LunarVim inside Neovide with arguments for each process
export LUNARVIM_RUNTIME_DIR="${LUNARVIM_RUNTIME_DIR:-"$HOME/.local/share/lunarvim"}"
export LUNARVIM_CONFIG_DIR="${LUNARVIM_CONFIG_DIR:-"$HOME/.config/lvim"}"
export LUNARVIM_CACHE_DIR="${LUNARVIM_CACHE_DIR:-"$HOME/.cache/lvim"}"

exec neovide ${neovide_args[@]} -- -u "$LUNARVIM_RUNTIME_DIR/lvim/init.lua" ${vim_args[@]}