formally supported method to iterate through all commits

[fche]

Repo.iter_items / iter_commits normally limits itself to parents of HEAD.
However, if a GitPython program wants to iterate through all commits in a git repo, it can use a hack like this:

   r = git.Repo('/path')
   for commit in r.iter_commits('--all'):
        pass

expecting the "--all" flag to be passed down to "git rev-list", and thence back to the python code. It would be nice if there were a more natural interface to expose this search, one that could also work with GitDB.

[Byron]

Thanks for sharing your thoughts!

I turned this into a discussion in case there should be some brainstorming about how such API should look like with potential contributors.

Please note that GitDB, to me, is end of life, so the GitCmdDB would be the only implementation left to support.

This also means that passing --all is valid and working, even though it certainly isn't the most desirable/idiomatic way to achieve this.