Support truffle boxes where the truffle project is not at the project root (e.g. monorepos)

[adrianmcli]

The current implementation forces all valid truffle boxes to have the truffle project be in the base directory for the repo by checking for a /master/truffle.js.

    var configURL = parseURL(
      vcsurl(url)
        .replace("github.com", "raw.githubusercontent.com")
        .replace(/#.*/, "") +
        "/master/truffle.js"
);

Source

I am the author of a Truffle Box (link) and I wanted to convert my Truffle Box into a monorepo instead. By that I mean I wanted to separate the frontend client and truffle project into two separate folders (not nested): /truffle and /client.

In other words, I wanted to be able to run truffle unbox <my truffle box name> and immediately get a monorepo of a truffle project and my frontend client in separate folders. However, the current implementation does not allow that and I understand why that might be the case. I assume you want all truffle boxes to deposit the truffle project in the current directory.

Nevertheless, I thought this was worth an issue anyhow.

[gasolin]

+1, /master/truffle.js should not be essential at the root of the template, but truffle-box.json does.

https://github.com/trufflesuite/truffle-box/blob/develop/lib/utils/unbox.js#L36