Argument unpacking marco for Nim

apply.nim

import macros
import std/strformat
from std/strutils import join

macro apply(n: typed, paramsToApply:seq|tuple): untyped =
  let formal_params = getImpl(n.symbol)[3]
  var variable_count:int = 0
  for node in formal_params:
    if node.kind == nnkIdentDefs:
      for n in node:
        if n.kind == nnkIdent:
          variable_count+=1
  var smt:seq[string] = @[]
  for i in 1..variable_count:
    smt.add fmt"{paramsToApply.symbol}[{i-1}]"
  result = parseStmt(&"{n.symbol}({smt.join(\",\")})")