Render references in square brackets as links in docstrings

[devurandom]

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The Clojure Style Guide suggests:

Wrap any var references in the docstring with ` so that tooling can identify them. Wrap them with [[..]] if you want to link to them.

(defn wombat
  "Acts much like `clojure.core/identity` except when it doesn't.
  Takes `x` as an argument and returns that. If it feels like it.
  See also [[kangaroo]]."
  [x]
  ...)

(https://guide.clojure.style/#document-references)

It would be nice if Cursive would display such references in [[symbol]] square brackets similar to how it displays symbol in a code context: with help / docstring on hover and the ability to jump to it with ctrl+click.

Maybe this is easier than complete markdown formatting, since the syntax and expected semantics are more explicit?

Related:

• https://github.com/cursive-ide/cursive/issues/2022
• https://github.com/cursive-ide/cursive/issues/1226