Unimplemented open, read, write, close in mipsy-web

[ramidzkh]

Could use https://developer.mozilla.org/en-US/docs/Web/API/File_System_API to a root sandbox directory with virtual handles, possibly with https://developer.mozilla.org/en-US/docs/Web/API/FileSystemSyncAccessHandle to not require an async rework

[spanishpear]

Thanks for the report!

Last time I looked into implementing this, it wasn't quite feasible to implement it cross-platform, as unfortunately Google decided to diverge from the official spec when it comes to the ability to write to the local filesystem. (https://hacks.mozilla.org/2012/07/why-no-filesystem-api-in-firefox/).

If you've got any implementation ideas (or if this has changed and I'm unaware - I haven't played with it recently), I'd welcome a PR - although there's lots of design debt in mipsy-web that can be quite hostile to work with. I had made some progress towards cleaning this up last year, but am unlikely to find the time or support to continue in the next few months.

[ramidzkh]

It should be possible in modern browsers, but it seems that you can't send the handles to workers in yew