Explicitly set default URL

[alexbozhenko]

Proposed change

We do not set the default URL here:
https://github.com/alexbozhenko/natscli/blob/v0.2.3/nats/main.go#L51

So it is not clear which server it will connect to by default when no context selected.

  -s, --server=URL              NATS server urls ($NATS_URL)

If no URL and no context is provided, it is coming from here:
https://github.com/nats-io/jsm.go/blob/v0.2.4/natscontext/context.go#L142

Can we set default URL in nats.go, to have:

  -s, --server="nats://127.0.0.1:4222"  NATS server urls ($NATS_URL)

(But that would require changing code around how url from context vs url from cli is handled)

Use case

Let users know that default url will be used if no context is selected.

Contribution

No response

[ripienaar]

This behaviour is consistent across all the clients and quite broadly documented, I dont think its a surprise.

However we should be able to make the default show up there if we combine with IsSetByUser(), will see what we can do