Allow boolean attributes

[aerni]

I think it would be really neat to allow simple boolean attributes to be passed to partials without specifying a value. This is useful for configuration type things.

Current behaviour

Currently, you'll have to pass a value to the parameter to make this work.

Template

{{ partial:block boxed="true" bordered="true" }}

{{ /partial:block }}

Block partial

---
bordered: false
collapsed: false
boxed: false
---

<section class="
    {{ view:bordered == 'true' ?= 'stack-border' }}
    {{ view:collapsed == 'true' ?= 'stack-space-collapse' }}
    {{ view:boxed == 'true' ?= 'py-48' }}
">
    {{ slot }}
</section>

Optimized behaviour

It'd be great if attributes without a value would automatically set the value to true in the context of the partial. Then this should work.

Template

{{ partial:block boxed bordered }}

{{ /partial:block }}

Block partial

---
bordered: false
collapsed: false
boxed: false
---

<section class="
    {{ view:bordered ?= 'stack-border' }}
    {{ view:collapsed ?= 'stack-space-collapse' }}
    {{ view:boxed ?= 'py-48' }}
">
    {{ slot }}
</section>