Add ability to set hotkeys for multiselect

[NickHeiner]

I'd like the ability to customize the hotkey options available to the user for multiselect. My dream is to have something like git add -p, where you get hotkeys like:

Stage this hunk [y,n,q,a,d,e,?]?

Example usage:

await prompts({
      // ...
      hotkeys: {
        d: {
          handle() {
            /* handle user action */
          },
          instruction: 'Save current progress and stop answering questions.'
        }
      },
    })

This PR is a draft. If you like the idea, I'll add tests / docs.

[terkelg]

This is cool – I like the idea a lot. Wonder if this could be a completely new prompt type?

[NickHeiner]

I think it could be a new prompt type, but at least for my use case, I'd also like to add it to multiselect. I'll add tests / docs to this PR next.

[NickHeiner]

This PR currently isn't passing on Node 6. (And there are a few cases, most notable lack of async/await support, that make supporting Node 6 make the code less readable.)

Node 6 is currently considered to be "end of life". It was released in 2016. How would you feel about dropping support for it?

[NickHeiner]

@terkelg how does this look to you now?

[terkelg]

@NickHeiner thank you for the PR! I'll have a look at this over the weekend. Quick note: You can use async/await. It's already used quite a few places

[NickHeiner]

Ok @terkelg I addressed your comments. It's now passing in Node 6.

[NickHeiner]

@terkelg I'm ready to move forward on this whenever you are. :smile:

[terkelg]

Looks good. I wonder if we should pass some arguments to the handler callback? Like a reference to the prompts so that you can provide some sort of visual feedback?

[NickHeiner]

Looks good. I wonder if we should pass some arguments to the handler callback? Like a reference to the prompts so that you can provide some sort of visual feedback?

Sounds interesting, but I'm not sure precisely what you have in mind. Can you elaborate?

[terkelg]

Right now there's no feedback to the user to indicate a hotkey has been pressed/activated. I wonder if there could be a way to change selected mode in the hotkey callbacks?

[NickHeiner]

If a hotkey changes which answers are selected, that's reflected in the rendered output. In this gif, we can see that pressing a (which is a "built in hotkey") and r (which is a hotkey added by this PR) both provide the same type of feedback.

Does this address what you're looking for, or am I misunderstanding?

[terkelg]

I'll have a look at it this weekend – I didn't get that for some reason

[terkelg]

        {
            type: 'multiselect',
            name: 'multicolor',
            message: 'Pick colors',
            hint: false,
            hotkeys: {
                d: {
                    handle(x, y) {
                        /* handle user action */
                    },
                    instruction: 'Save current progress and stop answering questions.'
                }
            },
            choices: [
                { title: 'Red', description: 'This option has a description.', value: '#ff0000' },
                { title: 'Green', value: '#00ff00' },
                { title: 'Yellow', value: '#ffff00', disabled: true },
                { title: 'Blue', value: '#0000ff' }
            ]
        },

When I run this I get no visual feedback as a user that I hit the hotkey?