From: Junio C Hamano <gitster@pobox.com>
Date: Wed, 14 Jan 2015 17:27:11 GMT
Subject: Re: How to prevent empty git commit --amend
Message-ID: <xmqqfvbdb7dc.fsf@gitster.dls.corp.google.com>
In-Reply-To: <vpqzj9lfzqg.fsf@anie.imag.fr>

Matthieu Moy <Matthieu.Moy@grenoble-inp.fr> writes:

> Ivo Anjo <ivo.anjo@ist.utl.pt> writes:
>
>> Is there a way to prevent a *git commit --amend** with nothing to
>> commit from working?
>> If not, I would like to suggest that this feature would be very helpful :)
>
> I don't know any way to let Git do the check for you, but 
>
> git diff --staged --quiet || git commit --amend
>
> should do it. You can alias it like
>
> [alias]
> 	amend = !git diff --staged --quiet || git commit --amend
>
> and then use "git amend".

That would not let you say "git amend Makefile", no?

	!sh -c 'git diff --cached --quiet "$@" || git commit --amend "$@"' -

or something, perhaps?