Comment by grose | Hacker News Reader

Comment by grose | Hacker News Reader

Very cool. This is super relevant to me, I've been porting Trealla Prolog to WASI recently[1] and I've been considering moving from wasmer-js to libapps/wasi-js-bindings. This looks like a nice alternative as well.

I tried running Trealla (you can grab a binary from here https://wapm.io/guregu/trealla) and it seems to work but it doesn't echo any of my input text. Does this have the terminal in raw mode by default? I'm curious how this works given that WASI lacks termios.h.

I always thought a "Steam for text games/CLI apps" would be super cool (ala webassembly.sh) but the WASI spec is missing a lot of terminal-related things: https://github.com/WebAssembly/WASI/issues/161

[1]: https://github.com/guregu/trealla-js

Oh awesome!! I've just added Trealla to my issues list to add it to Runno.

If you go into settings you can switch stdin echo on/off. I have stdio devices set up to return their file type as "Character Device" (see: https://github.com/taybenlor/runno/blob/main/packages/wasi-m...). It seems like some binaries handle this well and act like they are directly connected to the TTY (e.g. my quickjs example). Not sure how they determine that. I'm very much coming at this from a web-developer interested in WASI direction, and not from any experience with OSes or linux.

Edit: btw my WASI runtime (@runno/wasi-motor) is very much in "I haven't even released it as an NPM package" state but you're welcome to copy the code and use it https://github.com/taybenlor/runno/tree/main/packages/wasi-m...

Thanks! This project is super cool. Looks like it is well on its way to replace the broken polyfill at https://wasi.dev.

That makes sense about the stdio file type. I will play around with it and see what I can do. I think I need to copy whatever QuickJS is doing :)

I'll keep an eye on your WASI runtime. I was just about to start hacking on the same thing. Dropped a comment in your issue about Trealla as well. Let's make WASI in the browser awesome!

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