Determine the extraction speed of a disc drive based on an EAC log.

riptime.py

#! /usr/bin/python

import sys, re

DRIVE_PATTERN = "Used drive  : (.+?)   Adapter"
TRACK_PATTERN = "([0-9]+) +\| +([0-9]+):([0-5][0-9].[0-9]{2}) \| +([0-9]+):([0-5][0-9].[0-9]{2}) \| +([0-9]+) +\| +([0-9]+)"
SPEED_PATTERN = "Extraction speed ([0-9]+.[0-9]) X"

def parse(log):
    if not log.startswith("Exact Audio Copy V"):
        raise Exception("Not an EAC log")

    drive = re.search(DRIVE_PATTERN, log).group(1)
    tracks = re.findall(TRACK_PATTERN, log)
    speeds = re.findall(SPEED_PATTERN, log)

    if len(speeds) == 0:
        raise Exception('No extraction speeds found')

    total_time = 0
    total_speed = 0
    weighted_speed = 0
    for i in range(len(speeds)):
        time = int(tracks[i][3]) * 60 + float(tracks[i][4])
        total_time += time
        total_speed += float(speeds[i])
        weighted_speed += time * float(speeds[i])

    print "Average/weighted average extraction speed for %s: %.2f/%.2f" \
        % (drive, total_speed / len(speeds), weighted_speed / total_time)

if __name__ == "__main__":
    if len(sys.argv) > 1:
        logf = open(sys.argv[1])
        log = logf.read()
        logf.close
    else:
        log = sys.stdin.read()

    parse(log)