parser = argparse.ArgumentParser(description='Calculates letter frequencies of given cipher text in a cipher file.')

parser.add_argument('CipherFile',

help='The cipher file to analyze.')

parser.add_argument("-s", "--spaces", action='store_true',

help="Counts spaces as a valid cipher character instead of ignoring them."

"", required=False)

parser.add_argument("-p", "--punctuation", action='store_true',

help="Counts punctuation as valid cipher characters instead of ignoring them."

"", required=False)

args = parser.parse_args()

cipherfile = args.CipherFile

with open(cipherfile, 'r') as cf:

ciphertext = cf.read()

cipherlettercounts = build_ngram_counts(ciphertext, 1, args.spaces, args.punctuation)

cipherdigramcounts = build_ngram_counts(ciphertext, 2, args.spaces, args.punctuation)

ciphertrigramcounts = build_ngram_counts(ciphertext, 3, args.spaces, args.punctuation)

cipherquadgramcounts = build_ngram_counts(ciphertext, 4, args.spaces, args.punctuation)

print("**** Cipher Text ****")

print("")

print(ciphertext)

print("")

print("Letter Counts:")

for c in cipherlettercounts:

print("{0} = {1}".format(c, cipherlettercounts[c]))

print("")

print("Digram Counts:")

for c in cipherdigramcounts:

print("{0} = {1}".format(c, cipherdigramcounts[c]))

print("")

print("Trigram Counts:")

for c in ciphertrigramcounts:

print("{0} = {1}".format(c, ciphertrigramcounts[c]))

print("")

print("Quadgram Counts:")

for c in cipherquadgramcounts:

print("{0} = {1}".format(c, cipherquadgramcounts[c]))