feat: fish autocomplete

[loks0n]

Adds auto completion for fish shell

[loks0n]

@molisani Love the package! Let me know if you have any suggestions

[molisani]

Ah, thank you very much for this contribution! This looks like all the machinery needed to register an autocomplete command with fish.

However, I'm not familiar with how fish autocomplete works, so do you know if the bash autocomplete format/strategy is compatible with fish? If not, we probably need something like this but for fish so that it can format the proposals correctly. (Although looking at that now, we could move that logic into some part of the @stricli/auto-complete module)

I don't think we would necessarily need that to get this PR merged, as the logic you've written up here is still correct and necessary, but I would want to make sure that we have a through-line for confirming that auto-complete works as expected.

[loks0n]

However, I'm not familiar with how fish autocomplete works, so do you know if the bash autocomplete format/strategy is compatible with fish? If not, we probably need something like this but for fish so that it can format the proposals correctly. (Although looking at that now, we could move that logic into some part of the @stricli/auto-complete module)

Ah right! I think it's slightly different. I've gone ahead and created a new file specifically for fish. Let me know if you want to go with an alternative approach.

[molisani]

I've created #58 which changes the approach for handling different shells. It needs further review from my team and there may be some small changes before it gets merged, but I think it would be easier to land your changes on top of #58. I'm currently out-of-office this week but I think once I am back I can prioritize that PR to make way for your feature.

[loks0n]

I've created #58 which changes the approach for handling different shells. It needs further review from my team and there may be some small changes before it gets merged, but I think it would be easier to land your changes on top of #58.

OK, no worries, I'll rebase once that is merged 👍