It turns out wmstatus works with sway as well

When Xwayland is running, that is.

There are a few issues, though, e.g. with the DPMS setting.

README.adoc

@@ -5,9 +5,9 @@ desktop-tools
 'desktop-tools' is a collection of tools to run my desktop that might be useful
 to other people as well:
 
- - 'wmstatus' does literally everything my i3 doesn't but I'd like it to. It
-   includes PulseAudio volume management and hand-written NUT and MPD clients,
-   all in the name of liberation from GPL-licensed software of course
+ - 'wmstatus' does literally everything i3/sway don't but I'd like them to.
+   It includes PulseAudio volume management and custom-made NUT and MPD clients,
+   all in the name of liberation from GPL-licensed software, of course
  - 'paswitch' displays a list of all PulseAudio sinks and ports and allows
    switching between them, moving all playing inputs
  - 'brightness' allows me to change the brightness of w/e display device I have

wmstatus.c

@@ -1,5 +1,5 @@
 /*
- * wmstatus.c: simple PulseAudio-enabled status setter for dwm and i3
+ * wmstatus.c: simple PulseAudio-enabled status setter for dwm and i3/sway
  *
  * Copyright (c) 2015 - 2021, Přemysl Eric Janouch <p@janouch.name>
  *
@@ -2637,7 +2637,7 @@ main (int argc, char *argv[])
 		{ 'd', "debug", NULL, 0, "run in debug mode" },
 		{ 'h', "help", NULL, 0, "display this help and exit" },
 		{ 'V', "version", NULL, 0, "output version information and exit" },
-		{ '3', "i3bar", NULL, 0, "print output for i3bar instead" },
+		{ '3', "i3bar", NULL, 0, "print output for i3bar/sway-bar instead" },
 		{ 'w', "write-default-cfg", "FILENAME",
 		  OPT_OPTIONAL_ARG | OPT_LONG_ONLY,
 		  "write a default configuration file and exit" },