[applications/shell] Shell panics in Shell::eval_cmdline().

[ghost]

https://github.com/theseus-os/Theseus/blob/585ab93e0505f9ac8385764ed4353c8271b80d83/applications/shell/src/lib.rs#L688-L721

let command = args.remove(0); 

This panics if args.len()==0. So shell input(cmdline) like

|

and

X | 

cause panic at args.remove().

I think the priority for this is low for now. So I just leave an issue here.

[kevinaboos]

thanks for reporting this @yingwei9! We haven't devoted a lot of time to the shell since it will be eventually removed in favor of a proper terminal emulator, but it'd still be good to fix this in the meantime.

If you'd like to submit a fix for this, that'd be greatly appreciated; I'd be happy to review a PR. Otherwise we can leave it open and see if anyone wants to tackle it.