Custom selects

[p3lim]

There are atleast two systems for a selection menu that I know of:

• typing "@" shows a list of roles/users to mention
• typing "#" shows a list of channels to mention

I'm looking for a way to add a custom menu like this where I could search through a pre-populated list, and once selected can replace the input with something based on the menu selection.

An example:

My custom selection menu is populated with "foo", "bar", "baz". It is activated by the "!" character. If I type the activating character (even mid-sentence) it'll bring up a search field and the menu with my 3 options, and I can type to filter them out. Once selected the output is replaced by a custom mention.

A functional example:

If I type "#" (in this example I'm replacing the channel select) it'll pop up a menu of all issues for a pre-configured GitHub repository. I can search through these issues by ID, title or description, and once I select one it creates a custom mention. Once the message is sent, an embed is attached to the message with more details about the issue.

I tried to search for this so I'm sorry if it's a duplicate.