Does exrm support Mix umbrella projects? about exrm

[bitwalker]

Currently it's not enabled, but I was talking with José the other day, and his belief was that it should work in theory. I'll create a test umbrella project and play around with getting it working. Could you give me an example of the umbrella project you have in mind, and how they interact? No need to be super specific, just a general idea so that I can create a test project which will match that scenario roughly.

[novabyte]

@bitwalker Thanks for the very fast reply. I've only been trying things out with a toy project at this point but my directory structure looks something like so:

$> tree -L 2
.
├── apps
│   ├── app_one
│   └── app_two
├── _build
│   └── dev
├── deps
│   ├── conform
│   ├── cowboy
│   ├── cowlib
│   ├── exrm
│   └── ranch
├── mix.exs
├── mix.lock
└── README.md

As you can see I've got Cowboy as a dependency. My toplevel mix.exs looks like this:

defmodule TestApp.Mixfile do
  use Mix.Project

  def project do
    [apps_path: "apps",
     deps: deps]
  end

  defp deps do
    [{:cowboy, github: "extend/cowboy"},
     {:exrm, "~> 0.6.10"}]
  end
end

I don't have any dependencies listed in the individual app mix.exs files. Does that help?

/edit I forgot to mention that app_one and app_two do not depend on eachother.

[bitwalker]

Perfect! That definitely helps. I'm addressing another issue tonight, but I'll get the test project set up and start looking at it tomorrow. I have a rough idea of where I think some changes will be required in exrm, but I'll have to dig in and see what breaks first. Thanks for bringing this to my attention again, I had let it kind of slip since umbrella projects haven't been too common so far.

[novabyte]

@bitwalker No probs, thanks for looking into this.

To quickly bootstrap an umbrella project that is pretty much exactly like mine you can do:

mix new test_app --umbrella
cd test_app/apps
mix new app_one
mix new app_two
cd ..
# add exrm dep
# add some other dep maybe cowboy
mix deps.get
mix release

Cheers.

[bitwalker]

One quick question for you, what were you planning on putting in app_one and app_two? Was one going to be a web server and the other something else?

[novabyte]

@bitwalker Well, sort of. I actually have two web servers and a common set of functionality but I was just tinkering with Elixir and Mix+exrm to see whether it could handle the "composite app" structure from Rebar.

I know that composite apps are sort of frowned upon with Rebar but sometimes they're necessary :/

[bitwalker]

Gotcha, well that's helpful for sure, I just want to make sure I've got a "real" test app. I'd hate to think I've got things figured out, push a new version, and then find out my assumptions were all wrong.

[bitwalker]

@novabyte I just pushed a new release, 0.6.15, which adds support for umbrella projects. If you'd like to see my example project which I used to test this, it's here. Thanks again!

[bitwalker]

@novabyte I've made quite a few changes tonight, and decided to roll over to a new minor version. The most up to date code is now in 0.7.0, and the umbrella example application has been updated. I would highly recommend checking it out and reading through the README there, as I think there will be some stuff of interest to you.

[novabyte]

@bitwalker wow, wow, wow! This is awesome, thanks so much! 😃

[bitwalker]

You're very welcome! Let me know if you run into any issues!