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I have a need for something like the following:

{# Template A #}
    {# Do X that sets variable x #}
    {# Do Y that sets variable y #}
    {# Pass x and y into A include partials #}

{# Template B #}
    {# Do X that sets variable x #}
    {# Do Y that sets variable y #}
    {# Pass x and y into B include partials #}

The logic for X and Y is the same in templates A and B.

Is there a way to write each once in some kind of dedicated partial and place them in templates A and B, something akin to return in a JavaScript function?

I'm not sure there is. I think that macros only produce front-end output. And so I have to duplicate the logic in each template. Is that right?

  • How good are your PHP skills? – Lindsey D Jul 29 at 20:59
  • Hi Lindsey. Not great. Is this plugin territory? – Jonathan Schofield Jul 30 at 10:59
  • Not necessarily, though it would be a reasonable solution. You can probably pull this off in raw Twig as well. – Lindsey D Jul 30 at 13:55
  • Ok. Am I right that you can’t use a Macro to change the state/contents of a variable – e.g. a hash – because a Macro is predicated on generating markup? If yes, is there another technique? – Jonathan Schofield Jul 30 at 15:18
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    Have just found Robin Schambach’s 2017 answer to Use a Twig macro to set a variable. I note that Twig perversion provides a return scope, which I think is what I need, but I’m nervous about relying on a third party plugin for this. Would be great if it were native to Craft. – Jonathan Schofield Jul 30 at 15:33
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As you noted in your comment, the Twig Perversion plugin will do exactly what you need. It allows you to return a value from a macro, which isn't typically something that Twig permits.

Personally, I'd consider it to be fairly safe to rely on this plugin for a few reasons. Marion is a long-standing and trusted developer in the community, the plugin is relatively simple, and could easily be replaced with a small custom module if it ever went defunct. It also doesn't touch your data, so removing it in the future won't cause any problems.

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    Twig Perversion relies on twig not changing drastically, which is a reasonably safe assumption. – Marion Newlevant Jul 30 at 19:01

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