adopt clack

[trebor]

changes:

• replace prompts with clack
• add empty template
• simlink common files between default and empty files
• improve template README.md
• refactor prompts

[trebor]

@mbostock there isn't an easy fix for the unit test, i'm hunting around for an alternative, but no luck so far. i could perhaps make a moch clack or something like that. that said, i don't want to hold this show up. so not sure if i should dive deeper on the unit test or bypass it for now.

[mythmon]

@trebor I spent some time today trying to use Clack elsewhere. I wasn't able to find any way to mock it directly. Instead I'm using the effect pattern and isolating all the Clack call into funtions that I swap out in tests.

[mootari]

(Referencing the 4 months old open PR bombshell-dev/clack#163 since it hasn't been mentioned yet from what I could tell.)

[mbostock]

I’m investigating testing now, and then I’ll approve (hopefully with a workaround, but we’ll see).

[trebor]

btw: i ran tests with create and everything ran smooth.

[mbostock]

I implemented some simple mocks for clack. It should do the trick for now.

[trebor]

great, thank you! we ready to merge?

[mbostock]

I found some more bugs in path validation (like, it didn’t support creating nested folders, or handle the path being a file). I’m testing some more and will approve & merge shortly.

[mcglincy]

woo, excited to use clack :)