Scala 3 macro to list source code of file

Question

I'm developing a library and want to showcase some code in a small website. The code-snippets should be sourced directly from the same project, i.e. the code needs to be self-referencing.

I want to write a macro that, given a file or a classname returns a string with the file contents. How can I achieve this?

Answer 1

I would also accept giving a classname or type as argument

Are you looking for such a macro?

import scala.quoted.*

inline def getContent[A]: String = ${getContentImpl[A]}

def getContentImpl[A: Type](using Quotes): Expr[String] =
  import quotes.reflect.*

     // for the source specifically of A
  // val str = TypeRepr.of[A].typeSymbol.tree.pos.sourceCode.getOrElse(
  //   report.errorAndAbort("no source code")
  // )

     // for the whole source file containing the definition of A
  val str = TypeRepr.of[A].typeSymbol.pos.getOrElse(
    report.errorAndAbort("no symbol position")
  ).sourceFile.content.getOrElse(
    report.errorAndAbort("no source-file content")
  )

  Expr(str)

// in a different file

getContent[A]

//import Macros.getContent
//
//object Main extends App {
//  class A:
//    def foo = 1
//
//  println(
//    getContent[A]
//  )
//}

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