Announcing Wio: A clone of Plan 9's Rio for Wayland May 1, 2019 on Drew DeVault's blog

For a few hours here and there over the past few months, I’ve been working on a side project: Wio. I’ll just let the (3 minute) screencast do the talking first:

Note: this video begins with several seconds of grey video. This is normal.

In short, Wio is a Wayland compositor based on wlroots which has a similar look and feel to Plan 9’s Rio desktop. It works by running each application in its own nested Wayland compositor, based on Cage - yet another wlroots-based Wayland compositor. I used Cage in last week’s RDP article, but here’s another cool use-case for it.

The behavior this allows for (each window taking over its parent’s window, rather than spawning a new window) has been something I wanted to demonstrate on Wayland for a very long time. This is a good demonstration of how Wayland’s fundamentally different and conservative design allows for some interesting use-cases which aren’t possible at all on X11.

I’ve also given Wio some nice features which are easy thanks to wlroots, but difficult on Plan 9 without kernel hacking. Namely, these are multihead support, HiDPI support, and support for the wlroots layer shell protocol. Several other wlroots protocols were invited to the party, useful for taking screenshots, redshift, and so on. Layer shell support is particularly cool, since programs like swaybg and waybar work on Wio.

In terms of Rio compatability, Wio has a ways to go. I would seriously appreciate help from users who are interested in improving Wio. Some notably missing features include:

If you’re interested in helping, please join the IRC channel and say hello: #wio on irc.freenode.net. For Wio’s source code and other information, visit the website at wio-project.org.

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