feat(cli): make app path optional

[eunjae-lee]

Summary

• This PR makes argument optional.
  (npx create-instantsearch-app will asks for the directory)
• After inferring project name from the directory, it asks if you want to name it differently.

Examples

Example 1

(path provided)

$ npx create-instantsearch-app ~/workspace/date-picker

The name of the application or widget: [date-picker]

date-picker is given as a default name but you can change there.

Example 2

(path not provided)

$ npx create-instantsearch-app

Project directory: 

Let's say you typed date-picker, then the next step would be:

The name of the application or widget: [date-picker]

The name is inferred from the path but again lets you update it.

[eunjae-lee]

To avoid the prompt, we need to pass the app name explicitly in the tests.

[eunjae-lee]

Unlike command-line argument, the string path including ~/ needs to be expanded by ourselves.

[francoischalifour]

How does it work if it starts with / or ./? Perhaps we should use a Regex instead.

[Haroenv]

is there a way to forward the path expanding to the shell instead?

[Haroenv]

If it's a problem, there's also https://nodejs.org/api/path.html#path_path_relative_from_to

[eunjae-lee]

@francoischalifour @Haroenv
In the end, it gets resolved here.

> path.resolve('/test')
'/test'
> path.resolve('./test')
'/Users/eunjaelee/workspace/create-instantsearch-app/test'
> path.resolve('~/test')
'/Users/eunjaelee/workspace/create-instantsearch-app/~/test'
> 

If a path starts with / or ./, path.resolve() works correctly. However ~ didn't work, because, I guess, it has no context of home directory, or something.

[Haroenv]

Thanks for checking Eunjae!

[Haroenv]

I was thinking that the name and the directory name probably shouldn't be the same, so that it would be:

Create InstantSearch App
[ errors ]

Create InstantSearch App m-directory
> widget name? [myDirectory]

not sure if that works with what you had in mind. I guess it also makes sense to ask for directory name if it's not given though

[eunjae-lee]

I was thinking that the name and the directory name probably shouldn't be the same

According to my-directory and myDirectory, do you mean the case difference? the name variable is not camelCase and we have a dedicated camelCaseName variable.

Let me know if I misunderstood you.

FYI, I've added the example in the PR description.

[Haroenv]

good for me, with those small suggestions!