Auto expanding the expand prompt

[garymh]

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• For issues or feature requests file a GitHub issue in this repository
• For general questions or discussion post in Gitter

Describe the problem

I would love to be able to auto bring up the help menu automatically when using the expand prompt. For example, something like:

choices = [{ key: "y", name: "Overwrite", value: :yes }, { key: "n", name: "Skip", value: :no }, { key: "a", name: "Overwrite all", value: :all }]
prompt.expand("Action?", choices, auto_expand: true)

would result in:

Action?
  y - Overwrite
  n - Skip
  a - Overwrite all
  Choice [y]:

The specific use case I have in mind is to have a mix of numbers and letters for options for the prompt- 1, 2, 3, "A", "B", etc. I suppose the same thing could be accomplished with #151 too 😄

I love the gem, btw!

Describe your environment

• OS version: macOS 11.2.3
• Ruby version: 2.7.2
• TTY::Prompt version: 0.23.0

[piotrmurach]

Hi Gary 👋

Thanks for using tty-prompt.

This feels to me to go against the spirit of expand prompt, e.i. a compact way to express a choice. Though I'll need to think about whether or not the :auto_expand option makes for a desirable change in the context of other prompts. Your needs would probably be much better served by the select prompt. However, as you rightly pointed out the support for specifying keys is not implemented yet. Please feel free to submit PR and let's take it from there.

[garymh]

Thanks Piotr! I'll definitely look into that if I get some time 😄