Merging :main-opts from existing deps.edn

[arichiardi]

Hello folks!

I have a small feature request/bug report on something I am trying to do for cider-nrepl. I have a deps.edn with the following section:

{:aliases
  {:test-cljs {:main-opts ["-m" "nrepl.cmdline" "--middleware"
                          "[cider.nrepl/cider-middleware,cider.piggieback/wrap-cljs-repl]"]}}

And cider-nrepl has a project.clj with the following :profiles key:

:test-cljs {:test-paths ["test/cljs"]
            :dependencies [[cider/piggieback "0.3.9"]]

It would be really awesome if somehow the end result could be:

{:aliases
  :test-cljs {:extra-paths ["test/cljs"]
              :extra-deps {cider/piggieback {:mvn/version "0.3.9"}}
              :main-opts ["-m" "nrepl.cmdline" "--middleware"
                              "[cider.nrepl/cider-middleware,cider.piggieback/wrap-cljs-repl]"]}}

I could then generate the deps.edn my Clojure CLI launcher and ditch the :deps section that I currently have in there 😄

Thank you for your work on this lib, I see it is going to be very useful!