#!/usr/bin/env python
import argparse
import heapq


def parse_args():
    parser = argparse.ArgumentParser(description="Analyze bashstart log for speed.")
    parser.add_argument('filename', help="often /tmp/bashstart.<PID>.log")
    parser.add_argument('-n', default=20, help="number of results to show")
    return parser.parse_args()


def main():
    args = parse_args()
    filename, n = args.filename, int(args.n)

    with open(filename) as f:
        q = []
        prev_time = None
        for line in f.readlines():
            line = line.split()
            if not line or '+' not in line[0] or len(line) < 3:
                continue
            text = ' '.join(line[2:])
            seconds, nanoseconds = line[1].split('.')
            time = int(nanoseconds)
            diff = time - prev_time if prev_time is not None else 0
            prev_time = time
            heapq.heappush(q, (diff, text))

    for diff, text in heapq.nlargest(n, q):
        print(diff / 1000000000, 's:', text)


if __name__ == '__main__':
    main()