For the latest work on this issue skip to comment #71 ✨ Select lists in action & condition configuration forms Needs work . This uses a new approach aligned with potential core enhancements in 📌 Allow definition objects to provide options Needs work . Patches 78+ here therefore also need core patch #61 https://www.drupal.org/files/issues/2020-07-24/2329937-61-options-provid... → to be applied to your core code.
In Rules 7.x, certain conditions and actions (such as "Show a message on the site") use select lists to allow a user to choose a value for a particular parameter/context (such as the type of message shown), and third-party modules can define the options for select lists using callback functions. It would be nice to have this functionality in 8.x as well.
I have uploaded a patch that implements this functionality (with "Show a message on the site") as an example. It certainly needs work, but hopefully it can be a starting point for something.
Needs work
3.0
Rules Core
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patch 118 crashes with 3.x-dev 9595fca
Call to undefined method Drupal\rules\Context\ContextDefinition::getOptionsProvider()
As I'm not getting any select list in rules module version 4.0.x-dev , I have applied changes in patch #118.
Please review.