Better in app module allow list default

[solnic]

This adds otp_apps config option which is then used to auto-discover module names for the in_app_module_allow_list option.

Closes #800

[sl0thentr0py]

so if I understand correctly, the user will still have to supply these values?
Is there no way to just detect a project root and just use that so that it works ootb?
We really want a good ootb experience here, that's kinda important.

[sl0thentr0py]

we can merge this but let's also please make the ootb experience possible

[solnic]

so if I understand correctly, the user will still have to supply these values?

No, the user would only have to provide names of applications that should be considered when auto-discovering the modules. For example if you're building an app called Blog and there's a corresponding :blog OTP app, then you just configure it in otp_apps: [:blog] and every module from this app will be added to in_app_module_allow_list setting.

[sl0thentr0py]

yes but that's still manual, why cannot we just detect a project root like other SDKs? we want good default ootb stacktraces

[solnic]

@sl0thentr0py due to Elixir limitations, it cannot provide us with this information in a released Elixir app, so it does work in dev env, but not released prod.

[sl0thentr0py]

okay but from here
#800 (comment)

If yes, then we get all the apps from the umbrella and do what's described below, otherwise just do it for the root app.

all the apps are already in the mix config, why do we ask for them again in a separate config?

[solnic]

okay but from here #800 (comment)

If yes, then we get all the apps from the umbrella and do what's described below, otherwise just do it for the root app.

all the apps are already in the mix config, why do we ask for them again in a separate config?

It's explained here #854 (comment)

[whatyouhide]

We need to mention the new option in :in_app_module_allow_list too