用git來管理工程的開發，git log是非常有用的‘歷史'資料，需求就是來自這里，我們希望能對git log有一個定制性強的過濾。此段腳本就是在完成這種類型的任務。對于一個repo所有branch中的commit，腳本將會把message中存在BUG ID的一類commits給提取整理出來，并提供了額外的search_key, 用于定制過濾。

代碼如下:
# -*- coding: utf-8 -*-
# created by vince67 Feb.2014
# nuovince@gmail.com

import re
import os
import subprocess

def run(project_dir, date_from, date_to, search_key, filename):
    bug_dic = {}
    bug_branch_dic = {}
    try:
        os.chdir(project_dir)
    except Exception, e:
        raise e
    branches_list = []
    branches_list = get_branches()
    for branch in branches_list:
        bug_branch_dic = deal_branch(date_from,
                                     date_to,
                                     branch,
                                     search_key)
        for item in bug_branch_dic:
            if item not in bug_dic:
                bug_dic[item] = bug_branch_dic[item]
            else:
                bug_dic[item] += bug_branch_dic[item]
    log_output(filename, bug_dic)

# abstract log of one branch
def deal_branch(date_from, date_to, branch, search_key):
    try:
        os.system('git checkout ' + branch)
        os.system('git pull ')
    except Exception, error:
        print error
    cmd_git_log = ["git",
                   "log",
                   "--stat",
                   "--no-merges",