>>> from gitutil import gitutil,shell
>>> gitutil.parse_giturl("git@github.com:guyskk/pygitutil.git")
('github.com', 'guyskk', 'pygitutil')
>>> gitutil.parse_giturl("https://github.com/guyskk/pygitutil.git")
('github.com', 'guyskk', 'pygitutil')
>>> gitutil.build_giturl('guyskk', 'pygitutil', host='github.com')
u'https://github.com/guyskk/pygitutil.git'
>>> gitutil.build_giturl('guyskk', 'pygitutil', host='github.com',style="ssh")
u'git@github.com:guyskk/pygitutil.git'
>>> gitutil.build_fileurl('guyskk', 'pygitutil', "readme.md", branch="master",
                  schema="https", host="github.com")
... u'https://github.com/guyskk/pygitutil/raw/master/readme.md'
>>> 

clone(repo_url, dest)
pull(repo_url, dest, branch="master")
pull_or_clone(repo_url, dest, branch="master")
--> (err,return_value)

modified_files(dest, repo_url, commit1, commit2=None)
--> [(status, filepath),...]

>>> from gitutil import gitutil,shell
>>> h=shell.run("python --help")
>>> h
(None, u"usage: python [option] ... 
>>> h=shell.run("python --h")
>>> h
(CalledProcessError(), None)
>>> 
>>> h=shell.run(["echo",u"中文"])
>>> h
(None, u'\u4e2d\u6587\r\n')
>>>