Interactive stack new

[mgsloan]

In the past, interactive stack new was discussed. I'm opening this issue to track adding an interactive prompt for template parameters. Leaving the prompts empty and just pressing enter should select a default value.

Additionally, an excellent suggestion comes from wcauchois, which is to attempt to get name / email info from git. If this info is available, use it as a default in the interactive prompt.

[gambogi]

Unless someone else is working on this, I'll take it. For clarity, I'm assuming this is to be in the style of cabal --init

[mgsloan]

Go for it, that'd be great!

[gambogi]

Do we only want NewOpts interactively? Or would it be appropriate to also get InitOpts?

Where should the interactive code live? It feels natural for it to go in Stack.New. If other commands do interaction (and it seems like there have been discussions to that effect) the actual interaction helper functions should probably be separate. A module like that doesn't already exist, right?

I was looking over Cabal's init implementation, and was thinking about taking it in that direction if that seems reasonable.

[mgsloan]

Where should the interactive code live? It feels natural for it to go in Stack.New. If other commands do interaction (and it seems like there have been discussions to that effect) the actual interaction helper functions should probably be separate. A module like that doesn't already exist, right?

Right, a module like that doesn't exist yet. It makes sense to me to create a module of utilities which handle user input stuff, though. Here's the only other spot, AFAIK, where stack asks for user input: https://github.com/commercialhaskell/stack/blob/master/src/Stack/Ghci.hs#L212