counter.py

#!/usr/bin/env python

"""
Display the per-commit size of a file in a git repository.

$ python counter.py setup.py
82e2452, 2016-02-23T23:57:25-05:00, 14 lines
94e26ae, 2016-02-24T12:01:39-06:00, 15 lines
26e51c5, 2016-03-07T13:35:19-06:00, 19 lines
fed0eb8, 2016-03-15T15:03:36-05:00, 18 lines
8b996ee, 2016-03-22T13:45:43-04:00, 18 lines
6c1c996, 2016-03-22T20:04:41-04:00, 53 lines
336f19e, 2016-04-07T15:01:09-05:00, 43 lines
ee9bd08, 2016-04-25T13:30:58-04:00, 41 lines
"""

import subprocess
import re
import sys


def git_line_count(fn):
    git = subprocess.Popen(["git", "log", "--shortstat", "--reverse",
                            "--pretty=format:%h %aI", fn],
                           stdout=subprocess.PIPE)
    out, err = git.communicate()
    out = out.decode('ascii')

    line_count = 0
    for line in out.split('\n'):
        if not line.strip():
            continue
        if line[0] != ' ':
            hash, time = line.split(' ')
        elif 'file' in line:
            try:
                insertions = int(re.findall(r'(\d+) insertion[\w]?\(\+\)', line)[0])
                line_count += insertions
            except IndexError:
                pass

            try:
                deletions = int(re.findall(r'(\d+) deletion[\w]?\(\-\)', line)[0])
                line_count -= deletions
            except IndexError:
                pass

            print("%s, %s, %d lines" % (hash, time, line_count))

if __name__ == '__main__':
    fn = sys.argv[1]
    sys.exit(git_line_count(fn))