jstimpson:[~/dev/erlang]: ./JesseStimpson-rebar3/_build/prod/bin/rebar3 new app foo
===> Writing foo/src/foo_app.erl
===> Writing foo/src/foo_sup.erl
===> Writing foo/src/foo.app.src
===> Writing foo/rebar.config
===> Writing foo/.gitignore
===> Writing foo/LICENSE
===> Writing foo/README.md
jstimpson:[~/dev/erlang]: cd foo
jstimpson:[~/dev/erlang/foo]: echo '{deps, [{recon, {git, "https://github.com/ferd/recon.git", {branch, "master"}}}]}.' > rebar.config
jstimpson:[~/dev/erlang/foo]: echo '{app_vars_file, [{foo, "myvars.app.config"}]}.' >> rebar.config
jstimpson:[~/dev/erlang/foo]: echo '{env, [{bar, baz}]}.' > myvars.app.config
jstimpson:[~/dev/erlang/foo]: ../JesseStimpson-rebar3/_build/prod/bin/rebar3 compile
===> Verifying dependencies...
===> Analyzing applications...
===> Compiling foo
===> Loading app vars from "myvars.app.config"
jstimpson:[~/dev/erlang/foo]: cat _build/default/lib/recon/ebin/recon.app
{application,recon,
             [{description,"Diagnostic tools for production use"},
              {vsn,"2.5.2"},
              {modules,[recon,recon_alloc,recon_lib,recon_map,recon_rec,
                        recon_trace]},
              {registered,[]},
              {applications,[kernel,stdlib]},
              {licenses,["BSD"]},
              {links,[{"Github","https://github.com/ferd/recon/"},
                      {"Documentation","http://ferd.github.io/recon/"}]},
              {build_tools,["mix","rebar3"]},
              {files,["src/","script/","rebar.lock","mix.exs","README.md",
                      "LICENSE"]}]}.
jstimpson:[~/dev/erlang/foo]: cat _build/default/lib/foo/ebin/foo.app
{application,foo,
             [{description,"An OTP application"},
              {vsn,"0.1.0"},
              {registered,[]},
              {mod,{foo_app,[]}},
              {applications,[kernel,stdlib]},
              {env,[{bar,baz}]},
              {modules,[foo_app,foo_sup]},
              {licenses,["Apache 2.0"]},
              {links,[]}]}.