Allow overriding an override

[visr]

I just discovered overrides, which work great, though I have one suggestion on setting overrides.

Currently if you set an override on a path that already has an override, you get an error and the override does not change:

❯ juliaup override set 1.10.4

❯ juliaup override set 1.10.4
Error: '\\?\D:\repo\ribasim\Ribasim' path already has an override configured.

This means that the only way to reliably set an override is this, because unset luckily doesn't error if it is already unset:

juliaup override unset
juliaup override set 1.10.4

I feel like if a user asks for a valid override, that should be done, rather than erroring out.

[mitiemann]

Also, if you try to juliaup override set [channel] which has not been juliaup add [channel], the confusing error message Error: '[channel]' does not exist. is displayed. It should be possible to search whether '[channel] is available on the channel list and then something like
Error: '[channel]' does not exist locally, but is available remotely. Do you want to add it now [y/n]:
would be a nice feature.

[davidanthoff]

Both excellent feature suggestions!

[mitiemann]

I feel like if a user asks for a valid override, that should be done, rather than erroring out.

Although probably you should print a warning. Otherwise an user might accidentally loosen an override, e.g.,

> juliaup override set 1.10.1

> juliaup override set 1.10

and you'd suddenly get 1.10.4 (maybe a bad example, but I think the principle applies).