bench-merge.py

#!/usr/bin/python3

import sys
import functools
import re
from collections import namedtuple, OrderedDict

Rec = namedtuple("Rec", "name time line")

def file_to_records(filename):
    res = OrderedDict()
    r = re.compile(r"test (.*)\.\.\. bench:\s+(.*) ns/iter")
    with open(filename) as fp:
        for line in fp:
            m = r.match(line)
            if m is not None:
                time_number = int(m.group(2).replace(",", ""))
                name = m.group(1).strip()
                res[name] = Rec(line=line, name=name, time=time_number)
    return res

def main(filenames):
    records = [file_to_records(fn) for fn in filenames]
    result = functools.reduce(merge, records)
    for records in result.values():
        print(records.line, end="")

def merge(rec1, rec2):
    for k2, v2 in rec2.items():
        if k2 not in rec1:
            rec1[k2] = v2
        elif rec1[k2].time > v2.time:
            rec1[k2] = v2
    return rec1


if __name__ == "__main__":
    main(sys.argv[1:])