Snippet from https://play.nim-lang.org

playground.nim

import strutils, macros
proc printImpl*(objects: openarray[string], sep = " ", endl = "\n", 
                file=stdout, flush=false) = 
  file.write(objects.join(sep))
  file.write(endl)
  if flush:
    file.flushFile()

macro print*(data: varargs[untyped]): untyped = 
  var objects = newTree(nnkBracket)
  var args = newTree(nnkArglist)
  for arg in data:
    if arg.kind == nnkExprEqExpr:
      # Add keyword argument
      args.add arg
    else:
      # Stringify automatically
      objects.add newCall("$", arg)
  objects = prefix(objects, "@")
  result = quote do:
    printImpl(`objects`, `args`)

print 5
print(1, 2, 3, 4)
print("hello world", 1, 2, sep = "XXX", endl="\n\n")
print(3, endl="test")