#!/usr/bin/python
# 2013-04-10 01:46 to 02:18: got Dulwich repository walking working
import sys

import dulwich.repo

def resolve(repo, tree, path):
    path = path[:]
    while path:
        tree = repo.get_object(tree[path.pop(0)][1])
    return tree

def history(repo, commit):
    queue = [commit]
    seen = set()
    while queue:
        cob = repo.get_object(queue.pop(0))
        if cob.id in seen:
            continue
        seen.add(cob.id)
        queue.extend(cob.parents)
        yield cob

def file_history(repo, raw_fname):
    fname = raw_fname.split(b'/')
    for cob in history(repo, repo.head()):
        try:
            blob = resolve(repo, repo.get_object(cob.tree), fname)
        except KeyError:
            blob = None

        yield cob, blob


def main(raw_fname):
    last_blob_id = None
    for commit, blob in file_history(dulwich.repo.Repo('.'), raw_fname):
        print(commit.id, commit.message.decode('utf-8').split('\n')[0])
        if not blob:
            print("no", raw_fname)
            pass
        elif blob.id == last_blob_id:
            print("unchanged")
        else:
            print("bytes:", len(str(blob)))
            last_blob_id = blob.id

if __name__ == '__main__':
    main(sys.argv[1].encode('utf-8'))