meta: Add xeventbind package

This is an X-specific script that changes (mostly) everything that needs
to be changed on resolution change, with the exception of X cursor size.

Note that any programs already running are not affected. For this kind
of functionality, you probably want to use Wayland instead.

xeventbind/.config/xeventbind/on-resolution-change.sh

@@ -0,0 +1,24 @@
+#!/bin/sh
+
+# Get the host width
+HOST_WIDTH=$(bspc query -T -m | jq '.rectangle.width')
+
+# Determine the DPI based on screen width
+if [ "$HOST_WIDTH" -eq "1920" ]; then
+  X_DPI=96
+fi
+
+if [ "$HOST_WIDTH" -eq "3840" ]; then
+  X_DPI=192
+fi
+
+# Reposition the desktop background
+~/.fehbg &
+
+# If the DPI needs to be changed, change it
+if [ "$X_DPI" ]; then
+  echo "Xft.dpi:$X_DPI" | xrdb -merge
+fi
+
+# Reload polybar with the new width / DPI
+~/.config/polybar/launch.sh main &