I am trying to spawn a floating window whose screen position would match currently focused, tiled or itself floating, window.

I am assuming the spawn command itself should reside inside keys list (like all other commands) while layout should reside in layoutHook. I can distinguish the window precisely by setting unique WM_NAME (urxvt makes that easy), and I can access currently focused window inside keys list; however, I don’t know if there’s a proper, built-in/non-dirty way of passing this information downwards into the layoutHook.

In addition, I am assuming (perhaps wrongly?) that during layout, focused window is going to be the newly spawned window – so I can’t access it there inside layout code.

Three ideas I have (descending order of hacky):

• store layout data into WM_NAME and parse it out down the line
• store dimensions as an X attribute and read it down in the layout hook
• store focused window as an MVar, then access it during layout to obtain dimensions

All these seem a bit hacky; is there a better way?