make 'devtools::create()', 'devtools::setup()' more flexible

[kevinushey]

I find myself doing something like this often:

1. Create a new project in RStudio (but forget to create it as an R package),
2. Wish that I could call devtools::create() or devtools::setup() to turn it into an R package.

Two things to 'wish' for:

1. devtools::create() shouldn't fail for empty directories (or directories only a .Rproj file),
2. devtools::setup() shouldn't fail if a .Rproj file already exists.

[hadley]

Any interest in implementing this?

[kevinushey]

Sure, I can take a shot at this.

[lock]

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