lupan-set-theme: now works with busybox readlink

xsession/bin/lupan-set-theme

@@ -23,8 +23,8 @@ fi
 
 pkill -USR1 '^dwm$'
 
-XRES=$(readlink -e ~/.Xresources)
-if [ -n "$XRES" ]; then
+XRES=$(readlink -f ~/.Xresources)
+if [ -f "$XRES" ]; then
     if [ "$THEME" = dark ]; then
         sed -i 's/^#undef THEME_DARK/#define THEME_DARK/' "$XRES"
     elif [ "$THEME" = light ]; then
@@ -35,11 +35,11 @@ if [ -n "$XRES" ]; then
 fi
 
 # Alacritty
-AYML=$(readlink -e ~/.config/alacritty/alacritty.yml)
-if [ -n "$AYML" ]; then
+AYML=$(readlink -f ~/.config/alacritty/alacritty.yml)
+if [ -f "$AYML" ]; then
     sed -i "s/^colors: [*].*/colors: *$THEME/" "$AYML"
 fi
-ATOML=$(readlink -e ~/.config/alacritty/alacritty.toml)
+ATOML=$(readlink -f ~/.config/alacritty/alacritty.toml)
 if [ -f "$ATOML" ]; then
     sed -i "s#^import =.*#import = [\"~/.config/alacritty/$THEME.toml\"]#" "$ATOML"
 fi
@@ -52,27 +52,27 @@ elif [ "$THEME" = light ]; then
 fi
 
 # Foot
-FOOT=$(readlink -e ~/.config/foot/foot.ini)
-if [ -n "$FOOT" ]; then
+FOOT=$(readlink -f ~/.config/foot/foot.ini)
+if [ -f "$FOOT" ]; then
     sed -i "s/^initial-color-theme .*/initial-color-theme = $THEME/" "$FOOT"
 fi
 
 # GTK
-XSET=$(readlink -e ~/.config/xsettingsd/xsettingsd.conf)
-if [ -n "$XSET" ]; then
+XSET=$(readlink -f ~/.config/xsettingsd/xsettingsd.conf)
+if [ -f "$XSET" ]; then
     sed -i -E "s#(Net/ThemeName) .*#\\1 \"${GTK_THEME}\"#" "$XSET"
     pkill -HUP -x xsettingsd
     gsettings set org.gnome.desktop.interface gtk-theme "${GTK_THEME}"
 fi
 
 # niri
-NIRI=$(readlink -e ~/.config/niri/config.kdl)
-if [ -n "$NIRI" ]; then
+NIRI=$(readlink -f ~/.config/niri/config.kdl)
+if [ -f "$NIRI" ]; then
     sed -i -E "s%^(include) \"(dark|light).kdl\".*%\\1 \"${THEME}.kdl\"%" "$NIRI"
 fi
 
 # waybar
-WCSS=$(readlink -e ~/.config/waybar/style.css)
+WCSS=$(readlink -f ~/.config/waybar/style.css)
 if [ -f "$WCSS" ]; then
     sed -i -E "s#file:///.*/(light|dark)[.]css#file://$HOME/.config/waybar/$THEME.css#" "$WCSS"
     killall -SIGUSR2 waybar