Re: [PATCH v4] submodule: port subcommand 'set-branch' from shell to C

["Đoàn Trần Công Danh" <congdanhqx@gmail.com>]

Hi Kaartic,

On 2020-05-24 00:19:38+0530, Kaartic Sivaraam <kaartic.sivaraam@gmail.com> wrote:
> I believe you missed Danh's v3 comments[1]. I'm mentioning them inline with
> some additional comments.

Thanks for checking this.

> On 23-05-2020 22:09, Shourya Shukla wrote:
> > 
> > diff --git a/builtin/submodule--helper.c b/builtin/submodule--helper.c
> > index f50745a03f..7e844e8971 100644
> > --- a/builtin/submodule--helper.c
> > +++ b/builtin/submodule--helper.c
> > @@ -2284,6 +2284,50 @@ static int module_set_url(int argc, const char **argv, const char *prefix)
> >   	return 0;
> >   }
> > +static int module_set_branch(int argc, const char **argv, const char *prefix)
> > +{
> > +	/*
> > +	 * We accept the `quiet` option for uniformity across subcommands,
> > +	 * though there is nothing to make less verbose in this subcommand.
> > +	 */
> > +	int quiet = 0, opt_default = 0, ret;
> > +	const char *opt_branch = NULL;
> > +	const char *path;
> > +	char *config_name;
> > +
> > +	struct option options[] = {
> > +		OPT__QUIET(&quiet,
> > +			N_("suppress output for setting default tracking branch")),
> 
> As '--quiet' in 'set-branch' is a no-op and is being accepted only for
> uniformity, I think it makes sense to use OPT_NOOP_NOARG instead of
> OPT__QUIET for specifying it, as suggested by Danh.

Yay, I still think it's better to use OPT_NOOP_NOARG, (and with shortopt q,
which I forgot in previous reply.)

	OPT_NOOP_NOARG('q', "quiet")

> Also, the description "suppress output for setting default tracking branch"
> doesn't seem to be valid anymore as we don't print anything when set-branch
> succeeds.

OPT_NOOP_NOARG will take care of description itself. Even if we choose
to not use OPT_NOOP_NOARG, a better description should be provided.

> > +		OPT_BOOL(0, "default", &opt_default,
> > +			N_("set the default tracking branch to master")),
> > +		OPT_STRING(0, "branch", &opt_branch, N_("branch"),
> > +			N_("set the default tracking branch")),
> > +		OPT_END()
> > +	};
> > +	const char *const usage[] = {
> > +		N_("git submodule--helper set-branch [--quiet] (-d|--default) <path>"),
> > +		N_("git submodule--helper set-branch [--quiet] (-b|--branch) <branch> <path>"),
> > +		NULL
> > +	};
> > +
> 
> I also agree with the Danh here that '--quiet' could be removed from usage.
> There's no point in mentioning '--quiet' in the usage when it has no effect.
> 
> > diff --git a/git-submodule.sh b/git-submodule.sh
> > index 39ebdf25b5..8c56191f77 100755
> > --- a/git-submodule.sh
> > +++ b/git-submodule.sh
> > @@ -750,33 +750,7 @@ cmd_set_branch() {
> >   		shift
> >   	done
> > -	if test $# -ne 1
> > -	then
> > -		usage
> > -	fi
> > -
> > -	# we can't use `git submodule--helper name` here because internally, it
> > -	# hashes the path so a trailing slash could lead to an unintentional no match
> > -	name="$(git submodule--helper list "$1" | cut -f2)"
> > -	if test -z "$name"
> > -	then
> > -		exit 1
> > -	fi
> > -
> > -	test -n "$branch"; has_branch=$?
> > -	test "$unset_branch" = true; has_unset_branch=$?
> > -
> > -	if test $((!$has_branch != !$has_unset_branch)) -eq 0
> > -	then
> > -		usage
> > -	fi
> > -
> > -	if test $has_branch -eq 0
> > -	then
> > -		git submodule--helper config submodule."$name".branch "$branch"
> > -	else
> > -		git submodule--helper config --unset submodule."$name".branch
> > -	fi
> > +	git ${wt_prefix:+-C "$wt_prefix"} ${prefix:+--super-prefix "$prefix"} submodule--helper set-branch ${GIT_QUIET:+--quiet} ${branch:+--branch $branch} ${default:+--default} -- "$@"
> >   }
> > 
> 
> Danh questioned whether '$branch' needs to be quoted here. I too think it
> needs to be quoted unless I'm missing something.
> 
> 
> ---
> Footnotes:
> [1]: https://lore.kernel.org/git/nycvar.QRO.7.76.6.2005230012090.56@tvgsbejvaqbjf.bet/T/#maf26182b084087ed08a2a72d3da2ee2026b1618e

For the better record, I think it's better to use a permenent link,
just in case lore.kernel.org go into the dust someday,
people can still have a reference if they have an archive.

https://lore.kernel.org/git/20200521230453.GB2042@danh.dev/

-- 
Danh