systemd: add & enable xsettingsd service

Update `dpi` script to interact with systemd units

.config/systemd/user/xsettingsd.service

@@ -0,0 +1,12 @@
+[Unit]
+Description=xsettingsd - provide settings to X11 applications
+Requires=xorg.target
+After=xorg.target profile.service
+
+[Service]
+ExecStart=/bin/sh -c 'xsettingsd -c $XDG_CONFIG_HOME/xsettingsd/xsettingsd.local'
+ExecReload=/bin/kill -s HUP $MAINPID
+Restart=always
+
+[Install]
+WantedBy=graphical-session.target

scripts/dpi

@@ -21,11 +21,9 @@ mkdir -p "$CONF_DIR"
     echo Gdk/UnscaledDPI $(( $dpi*1024/($dpi/96) ))
 } > $CONF_DIR/xsettingsd.local
 
-pid=$(xprop -name xsettingsd _NET_WM_PID 2> /dev/null | awk '{print $NF}')
-if [ -z "$pid" ]; then
-    xsettingsd -c $CONF_DIR/xsettingsd.local &
-else
-    kill -HUP $pid
-fi
-
 echo Xft.dpi: $dpi | xrdb -merge
+xrandr --dpi $dpi
+
+systemctl --user reload-or-restart xsettingsd
+systemctl --user --no-block reload i3
+systemctl --user --no-block restart polybar@i3bar dunst