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Re: [PATCH 1/3] ls-tree: make <tree-ish> optional

On Tue, Jul 3, 2018 at 3:05 PM, Junio C Hamano <gitster@xxxxxxxxx> wrote:
> Elijah Newren <newren@xxxxxxxxx> writes:
>> On Mon, Jul 2, 2018 at 8:58 PM, Joshua Nelson <jyn514@xxxxxxxxx> wrote:
>>> use syntax similar to `git-checkout` to make <tree-ish> optional for
>>> `ls-tree`. if <tree-ish> is omitted, default to HEAD. infer arguments as
>>> follows:
>>> 1. if args start with --
>>>         assume <tree-ish> to be HEAD
>>> 2. if exactly one arg precedes --, treat the argument as <tree-ish>
>>> 3. if more than one arg precedes --, exit with an error
>>> 4. if -- is not in args
>>>         a) if args[0] is a valid <tree-ish> object, treat is as such
>>>         b) else, assume <tree-ish> to be HEAD
>>> in all cases, every argument besides <tree-ish> is treated as a <path>
>> Cool, this is something I've wanted a few times.
> Hmph, is it, and why?

Default <tree-ish> of HEAD when nothing is specified is certainly
something I wanted.  To be honest, I wanted it for rev-list too.
Despite dozens if not hundreds of times of typing 'git ls-tree -r' or
'git rev-list' expecting to see the results for HEAD (just as git log
does), and getting git's error message reminding me that I need to
specify HEAD, I can't seem to get it through my head to remember that
I need to specify it.

> I'd prefer *not* to have such a DWIM in a command like ls-tree, aka
> plumbing commands, where predictability is worth 1000 times more
> than ease of typing.

Fair enough.  However, what if no <tree-ish> or <path> are specified,
though -- would you be okay with the HEAD being assumed instead of
erroring out in that case?