Working with Nix Shell: clarification regarding easy-purescript-nix example

[sbellem]

Hi,

thanks for this guide. As someone who is totally new to the "nixverse" I was a bit puzzled by the following very simple example, under https://github.com/justinwoo/nix-shorts/blob/master/posts/working-with-nix-shells.md#expressions-as-arguments:

But instead of only top level attributes, you can also put entire expressions in the -p argument. For example, with the easy-purescript-nix project:

$ nix-shell \
    -p 'let ep = import ./default.nix {}; in [ ep.purs ep.spago ]' \
   --run 'which purs; which spago; purs --version; spago version'
/nix/store/some-hash-purescript/bin/purs
/nix/store/some-hash-spago/bin/spago
0.13.3
0.9.0.0

So, if I understood correctly the command has to be run under a clone of the easy-purescript-nix repository. Perhaps adding the necessary git clone ... && cd ... instruction would be helpful.

I can make a small pull request for this if it makes sense.

Thanks!