From: Junio C Hamano <gitster@pobox.com>
Date: Mon, 08 Aug 2022 14:46:57 GMT
Subject: Re: [PATCH] branch: allow "-" as a short-hand for "previous branch"
Message-ID: <xmqq4jymvllq.fsf@gitster.g>
In-Reply-To: <pull.1315.git.1659910949556.gitgitgadget@gmail.com>

"Rubén Justo via GitGitGadget"  <gitgitgadget@gmail.com> writes:

> From: rjusto <rjusto@gmail.com>
>
> Align "branch" with the intuitive use of "-" as a short-hand
> for "@{-1}", like in "checkout" and "merge" commands.
>
> $ git branch -d -      # short-hand for: "git branch -d @{-1}"
> $ git branch -D -      # short-hand for: "git branch -D @{-1}"

The "-d" and "-D" options being the more detructive ones among other
operation modes of the command, I am not sure if this change is even
desirable.  Even if it were, the implementation to special case a
single argument case like this ...

> +	if ((argc == 1) && !strcmp(argv[0], "-")) {
> +		argv[0] = "@{-1}";
> +	}

... (by the way, we don't write braces around a single statement
block) would invite cries from confused users why none of these ...

 $ git branch -m - new-name
 $ git branch new-branch -
 $ git branch --set-upstream-to=<upstream> -
    
work and "-" works only for deletion.

So, I dunno.