Support for project.json (ASP .NET 5)

[JoshVarty]

We have a customer who is using ASP .NET 5 and would like to use Alive with it.

Unfortunately (or fortunately?) ASP .NET 5 uses an entire new build system and not MSBuild.

We need to investigate the following:

• project.json files
• .xproj files It turns out these aren't important at all.
• The ASP .NET Design Time Host

[JoshVarty]

I've started investigating the Design Time Host.

The docs are currently empty: http://docs.asp.net/en/latest/dnx/design-time-host.html

I've asked for some help with this stuff at: dotnet/AspNetCore.Docs/issues/195

[JoshVarty]

Further investigation shows that Design Time Host is separate process. I've taken a peek at how Omnisharp has interacted with it:

https://github.com/OmniSharp/omnisharp-roslyn/blob/af8635e1bc4dbbc3f795878b262f660419c4a3ec/src/OmniSharp/AspNet5/DesignTimeHostManager.cs#L37-L60

[JoshVarty]

I have begun investigating using the VisualStudioWorkspace to solve this instead of dealing with the DTH directly. Unfortunately, there are some issues to overcome here. It's hard to tell when the VisualStudioWorkspace is "ready" and has loaded all the projects in the solution.

I've opened an issue discussing this at Roslyn's repo. See: dotnet/roslyn/issues/3726