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diff --git a/dark-theme.sh b/dark-theme.sh
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+#!/usr/bin/env bash
+
+# Inspiration: https://www.reddit.com/r/unixporn/comments/f1oied/awesome_global_nightday_switch_for_gtk_vim/
+
+# Requirements:
+# glib2: for gsettings for GTK switching under Wayland
+# xfce4-settings: for xfsettings for GTK switching under Xorg
+# qt5ct: for Qt5 switching 
+# adwaita-qt: as Qt5 theme
+# sed: for switching multiple things by editing config files
+# jq: for switching code by editing JSON
+# moreutils: providing sponge for in-place editing code config file
+# feh: for setting wallpaper under Xorg
+# sway: for setting wallpaper in sway
+
+# enable "strict mode"
+set -euo pipefail
+IFS=$'\n\t'
+
+CURRENT=$(gsettings get org.gnome.desktop.interface gtk-theme)
+
+if [[ $1 == "dark" ]]; then
+  UI_THEME_GTK="Adwaita-dark"
+  UI_THEME_QT="Adwaita-Dark"
+  UI_VSCODE="Default Dark+"
+  UI_ALACRITTY="dark"
+  BG_X11="-B black ${HOME}/.wallpaper/light.png"
+  BG_SWAY="--color #000000 --image ${HOME}/.wallpaper/light.png"
+elif [[ $1 == "light" ]]; then
+  UI_THEME_GTK="Adwaita"
+  UI_THEME_QT="Adwaita"
+  UI_VSCODE="Default Light+"
+  UI_ALACRITTY="light"
+  BG_X11="-B white ${HOME}/.wallpaper/dark.png"
+  BG_SWAY="--color #ffffff --image ${HOME}/.wallpaper/dark.png"
+elif [[ $1 == "toggle" ]]; then
+  [[ "$CURRENT" == *"dark"* ]] && exec $0 light || exec $0 dark
+elif [[ $1 == "reapply" ]]; then
+  [[ "$CURRENT" == *"dark"* ]] && exec $0 dark || exec $0 light
+else
+  exit 1
+fi
+
+
+# set GTK theme
+if [[ "$XDG_SESSION_TYPE" == "x11" ]]; then
+  # Start xfsettingsd - alreday running xfsettingd ignores this
+  xfsettingsd --daemon
+  # 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"
+else
+  # set GTK theme via gsettings
+  gsettings set org.gnome.desktop.interface gtk-theme "$UI_THEME_GTK"
+fi
+
+# set Qt theme
+sed -i -E "s@^style=.*@style=${UI_THEME_QT}@" ~/.config/qt5ct/qt5ct.conf
+
+# set alacritty theme
+sed -i -E "s/^colors: \*.*$/colors: *$UI_ALACRITTY/" ~/.config/alacritty/alacritty.yml
+
+# set vscode theme
+f="$HOME/.config/Code - OSS/User/settings.json"
+jq ".[\"workbench.colorTheme\"]=\"${UI_VSCODE}\"" "$f" | sponge "$f"
+
+# set background
+if [[ "$XDG_SESSION_TYPE" == "x11" ]]; then
+  feh --no-fehbg --bg-center ${BG_X11}
+elif [[ -n "$SWAYSOCK" ]]; then
+  killall -q swaybg
+  swaybg --mode center "$BG_SWAY" &
+else
+  echo "No supported window manager."
+  echo "Not setting background"
+fi