Re: [PATCH 3/8] tag: Change misleading --list <pattern> documentation

[Junio C Hamano <gitster@pobox.com>]

Ævar Arnfjörð Bjarmason  <avarab@gmail.com> writes:

> However, documenting this as "-l <pattern>" was never correct, as
> these both worked before Jeff's change:
>
>     git tag -l 'v*'
>     git tag 'v*' -l

Actually, we do not particularly care about the latter, and quite
honestly, I'd prefer we do not advertise and encourage the latter.
Most Git commands take dashed options first and then non-dashed
arguments, and so should "git tag".  A more important example to
show why "-l <pattern>" that pretends <pattern> is an argument to
the option is wrong is this:

	git tag -l --merged X 'v*'

and this one

>     git tag --list 'v*rc*' '*2.8*'

> diff --git a/t/t7004-tag.sh b/t/t7004-tag.sh
> index 74fc82a3c0..d36cd51fe2 100755
> --- a/t/t7004-tag.sh
> +++ b/t/t7004-tag.sh
> @@ -118,6 +118,18 @@ test_expect_success 'listing all tags if one exists should succeed' '
>  	git tag
>  '
>  
> +cat >expect <<EOF
> +mytag
> +EOF
> +test_expect_success 'Multiple -l or --list options are equivalent to one -l option' '
> +	git tag -l -l >actual &&
> +	test_cmp expect actual &&
> +	git tag --list --list >actual &&
> +	test_cmp expect actual &&
> +	git tag --list -l --list >actual &&
> +	test_cmp expect actual
> +'

OK.  I do not care too deeply about this one, but somebody may want
to tighten up the command line parsing to detect conflicting or
duplicated cmdmode as an error in the future, and at that time this
will require updating.  I am not sure if we want to promise that
giving multiple -l will keep working.

> +test_expect_success 'tag -l can accept multiple patterns interleaved with -l or --list options' '
> +	git tag -l "v1*" "v0*" >actual &&

This is good thing to promise that we will keep it working.

> +	test_cmp expect actual &&
> +	git tag -l "v1*" --list "v0*" >actual &&
> +	test_cmp expect actual &&
> +	git tag -l "v1*" "v0*" -l --list >actual &&
> +	test_cmp expect actual

I'd prefer we do *not* promise that it will keep working if you give
pattern and then later any dashed-option like -l to the command by
having tests like these.

Thanks.