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Date:   Sat, 20 Mar 2021 01:06:05 -0400
From:   Jeff King <peff@peff.net>
To:     ZheNing Hu <adlternative@gmail.com>
Cc:     Junio C Hamano <gitster@pobox.com>,
        ZheNing Hu via GitGitGadget <gitgitgadget@gmail.com>,
        Git List <git@vger.kernel.org>,
        "Bradley M. Kuhn" <bkuhn@sfconservancy.org>,
        Brandon Casey <drafnel@gmail.com>,
        Shourya Shukla <periperidip@gmail.com>,
        Christian Couder <christian.couder@gmail.com>,
        Rafael Silva <rafaeloliveira.cs@gmail.com>
Subject: Re: [PATCH v10 2/3] interpret-trailers: add own-identity option
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On Sat, Mar 20, 2021 at 10:54:38AM +0800, ZheNing Hu wrote:

> I am looking for how to extract each author or committer from the log.
> I just know I can use:
> 
> $ git log --pretty="%an %ae" | sort | uniq
> 
> get all unique author <email> from a git repo.
> Is there any function in the source code of git to get them?

If I understand Junio's suggestion correctly, it is very similar to how
"commit --author" works. See how it calls find_author_by_nickname(),
which finds the first commit matching the name, and then pulls out the
full name from format_commit_message().

-Peff