Allow exiting object selection early

[jackwilsdon]

Fixes #3083.

I've updated the CLI documentation to mention the new q option, but I'm not exactly a wordsmith 😁 let me know if you can think of some better phrasing!

[sampsyo]

Awesome! This implementation looks good, and I think the documentation text is perfect as well.

There's just one small thing that concerns me: whether the word "quit" alone is enough to suggest the right behavior to the user. I can imagine people seeing that for the first time and imagining that it will cancel the whole operation rather than applying to all the items that have been selected so far.

The thing is, that might be fine—because if someone intends to abort the whole process, they probably will do it on the first prompt, when the behavior is identical to "quit." And given that I don't have a great idea for an alternative to "quit," maybe we should just roll with it! But I thought I'd get your thoughts on the matter before we hit the green button.

Other than that reservation, I think this is good to go!

[jackwilsdon]

Yeah I wasn't sure on "quit" either, but couldn't think of another term to use 😖 The only alternative I can think of right now is cancel, but I'm not sure if that makes it clear to the user that it will stop the selection process as opposed to just skipping the current object.

[sampsyo]

There's always something excessively verbose like "skip remaining," I guess! But you're right; "quit" is probably the best bet. 👍

[jackwilsdon]

What do you think about changing it to cancel?

$ beet modify title="New Title"
Modifying 1 items.
Artist - Album - Title
  title: Title -> New Title
Really modify, move and write tags? (Yes/no/select) s   

Artist - Album - Title
  title: Title -> New Title
Really modify, move and write tags? (yes/no/cancel) c

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Edit: after reading what I just wrote, I realised "cancel" kind of implies that none of the previously selected modifications are applied, which isn't true. I'll let you merge this if you're happy with quit 😄

[sampsyo]

Yes indeed, I think "quit" is a little better than "cancel." Merging! Thank you for your help on this (and for thinking through the wording with me)!! ✨ 🚀