Smart inference of Java type for user tag parameter

[angelozerr]

Given this user tag src/main/resources/tags/myUser.html:

Login: {user.login}

At this step, we cannot know what is user

Given a Qute template which consumes the user tag

{@org.acme.User userFromJava}
{#myUser user=userFromJava /}

At this step we can inject the org.acme.User Java type inside the myUser.html which will provide completion, validation, hover, defintion,etc

This feature is very important to support for instance https://github.com/FroMage/RivieraDEV-Quarkus/blob/main/src/main/resources/templates/tags/organisers.html

[FroMage]

Actually, I think the theory is that I should define a Java class to declare the tags parameters, I'm sure I discussed it with @mkouba but I can't find where. Something like:

public class tags {
 @CheckedTemplates
 public static class Templates {
  public static native TemplateInstance myUser(User user);
 }
}

Or was it?

 @CheckedTemplates
public class tags {
 public static native TemplateInstance myUser(User user);
}

I can't recall.

It's been discussed in quarkusio/quarkus#21859 though, as well as default parameter values (added in quarkusio/quarkus#25488). I don't know if we can declare default template parameter values from the Java side, though. Perhaps only when declaring parameters in the template?

[FroMage]

Otherwise, we can declare tags/myUser.html as such:

{@model.User user}
Login: {user.login}

[angelozerr]

Otherwise, we can declare tags/myUser.html as such:

Indeed it is working. I think it is the best solution, no?

[mkouba]

You can both a type-safe template that corresponds to templates/tags/myUser.html or a parameter declaration inside the tag template (e.g. {@org.acme.User user}).

Both

@CheckedTemplates
public class tags {
   static native TemplateInstance myUser(User user);
}

and

@CheckedTemplate(basePath = "tags"
public class Whatever {
   static native TemplateInstance myUser(User user);
}

should work.

Both solutions are equally good.

[FroMage]

So I wasn't wrong, yay :)

I didn't find this documented in https://quarkus.io/guides/qute-reference#typesafe_templates though, probably it should, no?

[mkouba]

So I wasn't wrong, yay :)

I didn't find this documented in https://quarkus.io/guides/qute-reference#typesafe_templates though, probably it should, no?

Well, tags are regular templates located in a special folder (templates/tags) and a special section is registered each. Otherwise the same rules apply. Of course, we could add a NOTE or something... feel free to send a PR ;-).