[Question] Can git cat-file have a type filtering option?

From: ZheNing Hu <adlternative@gmail.com>
To: Git List <git@vger.kernel.org>
Cc: Junio C Hamano <gitster@pobox.com>, johncai86@gmail.com
Subject: [Question] Can git cat-file have a type filtering option?
Date: Fri, 7 Apr 2023 22:24:22 +0800	[thread overview]
Message-ID: <CAOLTT8RTB7kpabN=Rv1nHvKTaYh6pLR6moOJhfC2wdtUG_xahQ@mail.gmail.com> (raw)

Sometimes when we use `git cat-file --batch-all-objects`, we only want
data of type "blob". In order to filter them out, we may need to use
some additional processes (such as `git rev-list --objects
--filter=blob:none --filter-provided-objects`) to obtain the SHA of
all blobs, and then use `git cat-file --batch` to retrieve them. This
is not very elegant, or in other words, it might be better to have an
internal implementation of filtering within `git cat-file
--batch-all-objects`.

However, `git cat-file` already has a `--filters` option, which is
used to "show content as transformed by filters". I'm not sure if
there is a better word to implement the functionality of filtering by
type? For example, `--type-filter`?

Thanks,
--
ZheNing Hu