autorandr VS xmonad-contrib

could use the postswitch hook provided by autorandr, though this would require letting autorandr manage your display layout as well: https://github.com/phillipberndt/autorandr

autorandr worked great for me for hot plugging when I would frequently use my laptop with two external monitors.

Autorandr does run in the background as it is a daemon. For systemd integration see https://github.com/phillipberndt/autorandr/blob/master/contrib/systemd/autorandr.service

I use autorandr (https://github.com/phillipberndt/autorandr) to load display configurations with a hotkey. I'm 100% sure there is a "better" way of doing so over my setup.

If your using X11, try autorandr. It's a bit clunky for me with the windows moving around after waking up but they eventually find where they're supposed to be... mostly.

I would suggest taking a look at something like autorandr to help dynamically adjust your settings when you connect/disconnect.

There's also autorandr that allows you to save monitor setups and automatically switch between them as you connect/disconnect displays

autorandr (link) (xorg)

No, but you can save settings to script and run on login. Arandr does it with GUI. Autorandr automates and manages multiple setups.

This should now also be fixed in HEAD: https://github.com/xmonad/xmonad-contrib/commit/90f4a96f933a8ecc014b6def54fb929ee9e73e49

If you're on NixOS then definitely look into /u/LSLeary's excellent flake! (docs)

Perhaps you're not aware of the module exposed by the xmonad-contrib flake? It can do most of the setup for you. See the NixOS Modules section of https://github.com/xmonad/xmonad-contrib/blob/master/NIX.md.

Seems there was a documentation bug in that module. Does this fix help?

There is X.L.CenteredIfSingle. However, it didn't land in 0.17.0, so you'll have to either wait for 0.17.1 (dropping soon, I promise!), compile xmonad from git, or just copy the file as-is (which should be doable) into your configuration.

Btw there is an alternative way to implement smart bar using `AltMax` from xmonad-contrib but I'm not using it because of this [known bug](https://github.com/xmonad/xmonad-contrib/issues/75).

Note that the linked solution is a bit buggy (see here). But regarding your question, it's as simple as it gets. You could maybe replace (getModeName <$> (XS.get :: X ModeName)) with XS.gets getModeNameand maybe defining it somewhere else (e.g. logMode :: Logger), but that's really it. You could wait for #703 to be merged (whenever that may be), or just take the code from there (PSA: still in a rough state, undocumented, and very likely will change) and roll with it: it is xmonad after all, your config is going to be compiled anyway!