Re: [QUESTION] how to diff one blob with nothing

From: Christian Couder <christian.couder@gmail.com>
Date: Aug 4, 2023, 08:28 UTC
Message-ID: <CAP8UFD2GV+1LhZDrSsgQ5=gRgYSTYsS36i2ugoBEHu-Oto-Sow@mail.gmail.com>
In-Reply-To: <CAOLTT8Tc9NevyUfwiPscEH7BqShSscb=iZP4r+7mjsEwouLeXg@mail.gmail.com>

On Fri, Aug 4, 2023 at 6:42 AM ZheNing Hu <adlternative@gmail.com> wrote:

Show 7 quoted lines

> Actually, there is no need to support a default empty blob.
> For example, with the command "git diff --no-index <file> /dev/null",
> it can compare a file with /dev/null, but it can only compare <file>
> and not <oid>.
> Therefore, using commands like "git diff <oid> /dev/null",
> "git diff --no-index <oid> /dev/null", or even "git diff <oid> --stdin"
> could potentially solve this issue.

Maybe it would be clearer to have a new option, called for example "--blob-vs-file", for that then. It could support both:

$ git diff --blob-vs-file <blob> <file>

and:

$ git diff --blob-vs-file <file> <blob>