Add when and unless to partial tag

[edalzell]

A DX improvement so this:

{{ if subtitle }}
    {{ partial:components/subtitle }}
        {{ subtitle }}
    {{ /partial:components/subtitle }}
{{ /if }}

{{ partial:components/subtitle :when="subtitle" }}
    {{ subtitle }}
{{ /partial:components/subtitle }}

Also supports the converse unless

[what-the-diff]

• Added a new method to the Partial class called shouldRender()
• This method checks if there is a when or unless parameter in the partial tag and returns true/false accordingly
• If no such parameters are present, it will return true by default (i.e., render)
• The render() function now calls this before rendering anything so that we can skip partials based on conditions

[jackmcdade]

Couldn't you do {{ subtitle ?= {partial:components/subtitle} }} though? 🤔 Like right from the docs: https://statamic.dev/new-antlers-parser#gatekeeper

[edalzell]

Couldn't you do {{ subtitle ?= {partial:components/subtitle} }} though? 🤔 Like right from the docs: statamic.dev/new-antlers-parser#gatekeeper

No, because in my example we're using a slot and I don't want the partial called at all. I'm not assigning the subtitle to the results of the partial, I'm passing it in.

[jasonvarga]

What Jack suggested just uses subtitle as the condition then renders the partial if subtitle is truthy. Good solution.

However it doesn't handle using partial as a tag pair.

[robdekort]

This is neat!