Explicit module nesting

[sdwolfz]

Initial draft of explicit module nesting.

Please take a look and tell me if you're OK with this approach before I convert the controller template as well.

My initial plan to split the template in 3 an add the indentation programmatically instead of editing every line in the template failed as I could not find a way to do it with Rails' own functionality and manual erb templates I tried were giving me weird errors when passing in binding to the template. So I decide to do it the brute force way.

Dockerfile will be deleted before merge.

Please don't merge this in until #2495 is merged as I have to modify the code to make it compatible.

[nickcharlton]

The need to add a lot of <%= indent %>, isn't sitting well with me, but I can't think of an alternative. What else did you try?

[sdwolfz]

The way I tried:

First I split the template into 3:

1. Top: containing just the module and class definition
2. Middle: the content of the class as is right now
3. End: just properly indented end statements

Then I used ERB, passing in binding as argument so it gets rendered with the current context.

This did not work. The template method does a lot more than just ERB rendering and writing to file, there were many things missing and I would get nil errors.

Unfortunately I did not find another way to generate 3 templates and then stitch them together.

[nickcharlton]

Interesting, thanks! I'd like to play around with it a bit, I think.

@pablobm, do you have any thoughts on this implementation? I'm really not sure what to suggest here.

[pablobm]

Yeah, the internals of Rails templates are not easy to work with... 😓 Something that might work though: how about generating the three files (head, body, foot) and then editing and merging them using normal File functions? My understanding is that the template call puts the file in place, suggesting that we might be able to take it from there.

[sdwolfz]

@pablobm how about generating the three files (head, body, foot) this is what's failing. Generating the 3 files using ERB is not the same as doing it with template, even if I pass binding in:

tpl = ERB.new(File.read('whatever.erb'))
result = template.result(binding)

This will fail with errors related to missing methods. Binding does not have the same access that template has to the Generator's context. It does more than just erb rendering.

Having the indents added in every line of the template is the only thing I could do to make it work.