checkcrc.nim

import os
import crc32
import strformat
import strutils
import nre except toSeq

import ../lib/die

let pat = re(r".*\[([0-9A-Fa-f]{8})\].*")

if paramCount() == 0:
  die("No filename provided.")

let filename = joinPath(getCurrentDir(), paramStr(1))
if not existsFile(filename):
  die(&"File '{filename}' doesn't exist.")

let digest = crc32FromFile(filename).toHex().toUpperAscii()

let match = filename.match(pat)
if match.isSome:
  let expectedDigest = match.get.captures[0]
  let detailsStr = &"Expected: {expectedDigest}, Actual: {digest}"
  if digest == expectedDigest:
    echo "OK."
  else:
    die(&"Fail. {detailsStr}")
else:
  echo digest