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From:   Junio C Hamano <gitster@pobox.com>
To:     Duy Nguyen <pclouds@gmail.com>
Cc:     Elijah Newren <newren@gmail.com>,
        Thomas Gummerer <t.gummerer@gmail.com>,
        Git Mailing List <git@vger.kernel.org>
Subject: Re: [PATCH 6/8] checkout: add --cached option
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Date:   Tue, 19 Feb 2019 11:10:24 -0800
In-Reply-To: <xmqqwolv1tzw.fsf@gitster-ct.c.googlers.com> (Junio C. Hamano's
        message of "Tue, 19 Feb 2019 11:02:59 -0800")
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Junio C Hamano <gitster@pobox.com> writes:

> I am getting the impression that to save typing, you would want to
> make "--index --worktree" the default (i.e. among the above, only
> --no-index and --no-worktree need to be spelled explicitly), but
> there is one glitch.  Updating from the index must be spelled
> explicitly with "--no-index --worktree".

And after getting reminded by Elijah, the default pair is
<--no-index, --worktree>.

> So perhaps the defaulting rule for the "--index" option must become
> a bit more tricky.  Perhaps the rules are:
>
>  * --worktree is the default; --no-worktree can be given from the
>    command line to countermand it, and --worktree can be given from
>    the command line to be more explicit.
>
>  * when --source <tree> is given from the command line, --index is
>    the default, and --no-index can be given to countermand it.

Correction.

    * when --source <tree> is given, --no-index is the default, but
      --index can be given to countermand it.

>
>  * when --source <tree> is not given from the command line,
>    --no-index is the only sensible choice.  It can be given from the
>    command line to be more explicit, but giving --index to
>    countermand the --no-index default would be an error, as updating
>    the index, whether the same update also goes to the working tree,
>    must come from a --source <tree>.

This is still correct.