cat.nim

import os
import strformat

template until(cond: bool, body: untyped): untyped =
  while (true):
    if cond: break
    body

for param in os.commandLineParams():
  if os.existsFile(param):
    let f: File = open(param, FileMode.fmRead)
    defer: f.close

    echo fmt"==== ({param}) ===="
    until f.endOfFile:
      echo f.readLine
    echo ""