support template file loaders

[nerdoc]

While I really like the idea having templates in visual context next to the code as inline strings, this has a few drawbacks too:

• You need to have an editor that supports highlighting - without that a template is badly readable. E.g. PyCharm does not support this.
• As long as templates are tiny, this is cool. When they get larger, you won't feel good as you loose the bigger view you gained with the advantage of code-template proximity. This also myabe is an editor issue, as e.g. code folding is not possible there.

So I would suggest to at least optionally add template loading from file, like:

class MyComponent(Component):
    ...
    template: django_html = get_template("my_app/components/my_component.html)

Maybe it could be a default too: if you don't specify a template attribute (with a str), the component looks in the default folder (app/template/app/components e.g.).

I can understand if you'd like to stay pure here too, and as I said in the first place, I support the idea of having inline templates. But it would be helpful to at least support external templates too.

[samwillis]

Thats a great idea, and thanks for the other comments! I have been pretty tied up with contract work but will take a proper look at this and your issues maybe this weekend.

The general feedback I have had is that the inline templates are good but maybe one step too far to encourage adoption. Tetra is the result of having a lot of ideas.

[gsxdsm]

Great points, thanks for the reply!

[gsxdsm]

One thing I noticed - changing the template referenced with template_name= doesn't trigger a rebuild of the Tetra component bundle. Feels like it should, right?

[nerdoc]

Yes, definitely. That's because interestingly Django doesn't recognize the template as template, I still don't know why yet. I think it's about caching, and I didn't find out yet wyy this doesn't work. ATM I am working mostly on the Form field upload feature, this captures all of my spare time I have for Tetra... But the autorebuild on file templates s on my list too.
But I think opening an issue would be a good idea.
Edit: #74

[gsxdsm]

Great, I'm going to dig into this and see if I can help resolve!

[nerdoc]

So, happily this is completed in 0.1.2, with many other improvements (and some breaking changes, watch out!)