Twig/variable support in Custom block HTML

Question

I'm trying to understand if/how you insert Twig variables in blocks in the custom block library.

To clarify, the block's HTML has been configured via the UI at /admin/structure/block/block-content

Standard Twig syntax, e.g. a 'say-something' tag like {{ base_path ~ directory }} - which I want so I can set an <img src attibute correctly - doesn't seem to be parsed at all and I don't see a way to use Tokens.

Examining the HTML source with Twig debugging on, it's theme hook is listed as "field", so if I add a preprocess function:

function themename_preprocess_field(array &$variables, $hook) {
  xdebug_break():
}

• that's being called rather too often
• when it does reach the custom block, there doesn't seem to be anything in $variables that labels it as such, other than a render array with the processed text:

$variables['items'][0]['content]['#text']

What's the simplest approach for this? Is the only way to do it to write a module?

Thanks, William

Answer 1

You can't use twig variables in the body field of a block (or a node). But you can use tokens. Install the modules Token and Token Filter. You need to add the token filter to the text format you are using in the body field.