#
#  Compute the number of words, lines and characters in a file.
#
import sys

# Retrieve the name of the file from the command line
if len(sys.argv) > 3:
  print("Usage: python", sys.argv[0], "<input_file> <results_file>")
  quit()
elif len(sys.argv) == 3:
  # Input from file and output is to a file
  inf = open(sys.argv[1], "r")
  outf = open(sys.argv[2], "w")
elif len(sys.argv) == 2:
  # Input from file and output is to the screen
  inf = open(sys.argv[1], "r")
  outf = sys.stdout
elif len(sys.argv) == 1:
  # Input from keyboard and output is to the screen
  inf = sys.stdin
  outf = sys.stdout

# Initialize our counters
lines = 0
words = 0
chars = 0

# Read and process every line in the file
line = inf.readline()
while line != "":
  # Add one to the line counter
  lines = lines + 1

  # Count the number of words and add that value to the word counter
  words = words + len(line.split())

  # Count the number of characters and add that value to the character counter
  chars = chars + len(line)

  # Read the next line from the file
  line = inf.readline()

# Close the file
inf.close()

# Write the counts to a file

outf.write("Lines: " + str(lines) + "\n")
outf.write("Words: " + str(words) + "\n")
outf.write("Chars: " + str(chars) + "\n")

outf.close()