hello_macro.nim

import macros, strutils

macro autofmt(s: string): stmt =
  result = newNimNode(nnkStmtList)
  var
    infixNode = newNimNode(nnkInfix)
    opNode = newIdentNode("%")
    fmtStrNode = newStrLitNode("Hello, $#!")
    bracketNode = newNimNode(nnkBracket)
  bracketNode.add(newStrLitNode("World"))
  infixNode.add(opNode)
  infixNode.add(fmtStrNode)
  infixNode.add(bracketNode)
  result.add(infixNode)

echo(autofmt"Hello, World!")

# This is what we're trying to recreate (baby steps)
dumpTree:
  "Hello, $#" % ["World"]