Delegating rules

[RBusarow]

Rules (at least for code samples) should be able to delegate to other rules by passing them their output.

For instance, given this code sample:

val kotlinConfig = """
  plugins{
    kotlin("jvm") version $kotlinVersion
    kotlin("plugin.serialization") version $kotlinVersion
    id("com.square.anvil") version $anvilVersion
  }

  // ...
""".trimIndent()

That rule's output would put the literal strings of $kotlinVersion and $anvilVersion into the markdown file's codeblock. In order to correct that, you'd have to add more rules like this:

<!--doks the-actual-code-sample:1, dollar-anvilVersion:1, dollar-kotlinVersion:2 -->
<!--doks END-->

It would be nice if those rules could just be declared as part of the code sample rule, since they're intrinsically linked.