Show info at startup if the auto-index page is used

[rodja]

Thanks to the auto-index page, NiceGUI is very easy to start with. It also helps when trying or sharing short code snippets. But as correctly stated on Discord, in 99% of all more complex apps, pages rather be generated for each user individually.

Maybe we could show an info message on startup in addition to "NiceGUI is ready to go on ..." if the main route / is serving the auto-index page? Something like

Note: all users will see the same state on '/'. Use https://nicegui.io/documentation/page to create individual versions.

[ksandvik]

Yes, either that or maybe even provide a unique / route for all apps as it's very seldom you want a 'shared' experience of a web instance.

[rodja]

provide a unique / route for all apps

That is technically not possible, because we do not want to re-evaluate the main script. We need some kind of function (eg. the page decorator) to be called for each new client.

[thatschatt]

I'm currently using Nicegui to make control interfaces for lab equipment, where the shared state is a huge selling point (since there is only one instrument that the interface is hooked up to). So definitely we should keep the shared page feature, although I agree that a warning for folk who don't expect it is a good idea.

In fact, it would be nice to be able to specify more pages as being shared, for example to make a shared device settings page. So maybe the best would be to specify in the page decorator if a given page should be private or shared. If no decorator is given for the '/' page, then we could show a warning on startup that it is in shared mode, and suggest that an explicit decorator is used to suppress this warning?