Simple bash script to globally toggle dark/light look and feel

set-interface

#!/bin/bash

if [[ $1 == "dark" ]]; then
  UI_THEME_GTK="Mojave-dark"
  UI_THEME_QT="KvMojave"
  UI_ICONS="Faenza-Ambiance"
  VIM_BG="dark"
elif [[ $1 == "light" ]]; then
  UI_THEME_GTK="Mojave-light"
  UI_THEME_QT="KvMojaveLight"
  UI_ICONS="Faenza-Radiance"
  VIM_BG="light"
elif [[ $1 == "toggle" ]]; then
  CURRENT=$(xfconf-query -c xsettings -p /Net/ThemeName)
  [[ "$CURRENT" == *"dark"* ]] && exec $0 light || exec $0 dark
else
  exit 1
fi

mydir="${0%/*}"
# set GTK theme xia xsettings
xfconf-query -c xsettings -p /Net/ThemeName -s "$UI_THEME_GTK"
xfconf-query -c xsettings -p /Net/IconThemeName -s "$UI_ICONS"
# set or create and set persistent property for vim to read on startup
xfconf-query -c xsettings -p /Gtk/laf -s "$1" || xfconf-query -c xsettings -p /Gtk/laf -n -t string -s $1
# set matching qt theme(doesn't apply to already running applications)
kvantummanager --set "$UI_THEME_QT"
# change 'background' option of all running nvim instances via RPC
find /tmp -path '/tmp/nvim*' -type s -exec $mydir/nvim-send {} "set background=$VIM_BG" \;
# change IntelliJ LaF via 'External LAF switch' plugin
echo "$1" | nc localhost 16666