From: Eric Sunshine <sunshine@sunshineco.com>
To: Luke Shumaker <lukeshu@lukeshu.com>
Cc: "Git List" <git@vger.kernel.org>,
"Avery Pennarun" <apenwarr@gmail.com>,
"Charles Bailey" <cbailey32@bloomberg.net>,
"Danny Lin" <danny0838@gmail.com>,
"David A . Greene" <greened@obbligato.org>,
"David Aguilar" <davvid@gmail.com>,
"Jakub Suder" <jakub.suder@gmail.com>,
"James Denholm" <nod.helm@gmail.com>, "Jeff King" <peff@peff.net>,
"Jonathan Nieder" <jrnieder@gmail.com>,
"Junio C Hamano" <gitster@pobox.com>,
"Nguyễn Thái Ngọc Duy" <pclouds@gmail.com>,
"Roger L Strain" <roger.strain@swri.org>,
"Techlive Zheng" <techlivezheng@gmail.com>,
"Luke Shumaker" <lukeshu@datawire.io>
Subject: Re: [PATCH 18/30] subtree: use $* instead of $@ as appropriate
Date: Sat, 24 Apr 2021 01:18:33 -0400 [thread overview]
Message-ID: <CAPig+cQ_7eVgdYuci1JeVwU89VOeOU6kzZ9=yw1ySR9RXzjuTA@mail.gmail.com> (raw)
In-Reply-To: <87zgxoa7cj.wl-lukeshu@lukeshu.com>
On Fri, Apr 23, 2021 at 7:50 PM Luke Shumaker <lukeshu@lukeshu.com> wrote:
> On Fri, 23 Apr 2021 14:40:31 -0600, Eric Sunshine wrote:
> > Nit: I have some trouble following what the commit message is actually
> > trying to say with "smash things" and "separate strings". It might be
> > simpler to say merely that use of "$@" in these particular instances
> > is overkill and possibly misleading to readers not familiar with the
> > finer details of $* vs. "$@".
Oof, I somehow misread the code this patch is touching and ended up
confusing myself, and the confusion bled into my review comments.
Sorry.
> How's this:
> ---
> subtree: use "$*" instead of "$@" as appropriate
>
> "$*" is for when you want to concatenate the args together,
> whitespace-separated; and "$@" is for when you want them to be separate
> strings.
>
> There are several places in subtree that erroneously use $@ when
> concatenating args together into an error message.
>
> For instance, if the args are argv[1]="dead" and argv[2]="beef", then
> the line
>
> die "You must provide exactly one revision. Got: '$@'"
>
> surely intends to call 'die' with the argument
>
> argv[1]="You must provide exactly one revision. Got: 'dead beef'"
>
> however, because the line used $@ instead of $*, it will actually call
> 'die' with the arguments
>
> argv[1]="You must provide exactly one revision. Got: 'dead"
> argv[2]="beef'"
>
> This isn't a big deal, because 'die' concatenates its arguments together
> anyway (using "$*"). But that doesn't change the fact that it was a
> mistake to use $@ instead of $*, even though in the end $@ still ended
> up doing the right thing.
This explanation spells out the problem nicely.
next prev parent reply other threads:[~2021-04-24 5:19 UTC|newest]
Thread overview: 144+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-04-23 19:42 [PATCH 00/30] subtree: clean up, improve UX Luke Shumaker
2021-04-23 19:42 ` [PATCH 01/30] .gitignore: Ignore /git-subtree Luke Shumaker
2021-04-23 19:42 ` [PATCH 02/30] subtree: t7900: update for having the default branch name be 'main' Luke Shumaker
2021-04-23 19:42 ` [PATCH 03/30] subtree: t7900: use test-lib.sh's test_count Luke Shumaker
2021-04-23 19:42 ` [PATCH 04/30] subtree: t7900: use consistent formatting Luke Shumaker
2021-04-23 21:51 ` Eric Sunshine
2021-04-23 22:54 ` Luke Shumaker
2021-04-27 7:17 ` Junio C Hamano
2021-04-27 20:41 ` Luke Shumaker
2021-04-28 4:33 ` Junio C Hamano
2021-04-23 19:42 ` [PATCH 05/30] subtree: t7900: comment subtree_test_create_repo Luke Shumaker
2021-04-23 19:42 ` [PATCH 06/30] subtree: t7900: use 'test' for string equality Luke Shumaker
2021-04-23 19:42 ` [PATCH 07/30] subtree: t7900: delete some dead code Luke Shumaker
2021-04-23 19:42 ` [PATCH 08/30] subtree: t7900: fix 'verify one file change per commit' Luke Shumaker
2021-04-23 19:42 ` [PATCH 09/30] subtree: t7900: rename last_commit_message to last_commit_subject Luke Shumaker
2021-04-23 19:42 ` [PATCH 10/30] subtree: t7900: add a test for the -h flag Luke Shumaker
2021-04-23 19:42 ` [PATCH 11/30] subtree: t7900: add porcelain tests for 'pull' and 'push' Luke Shumaker
2021-04-23 20:19 ` Eric Sunshine
2021-04-23 22:27 ` Luke Shumaker
2021-04-23 19:42 ` [PATCH 12/30] subtree: don't have loose code outside of a function Luke Shumaker
2021-04-23 20:05 ` Luke Shumaker
2021-04-23 20:23 ` Eric Sunshine
2021-04-23 22:43 ` Luke Shumaker
2021-04-23 23:11 ` Eric Sunshine
2021-04-23 23:37 ` Luke Shumaker
2021-04-23 19:42 ` [PATCH 13/30] subtree: more consistent error propagation Luke Shumaker
2021-04-23 19:42 ` [PATCH 14/30] subtree: drop support for git < 1.7 Luke Shumaker
2021-04-23 20:07 ` Luke Shumaker
2021-04-23 20:31 ` Eric Sunshine
2021-04-23 23:28 ` Luke Shumaker
2021-04-23 23:50 ` Eric Sunshine
2021-04-24 0:20 ` Luke Shumaker
2021-04-23 19:42 ` [PATCH 15/30] subtree: use `git merge-base --is-ancestor` Luke Shumaker
2021-04-23 19:42 ` [PATCH 16/30] subtree: use git-sh-setup's `say` Luke Shumaker
2021-04-23 19:42 ` [PATCH 17/30] subtree: use more explicit variable names for cmdline args Luke Shumaker
2021-04-23 19:42 ` [PATCH 18/30] subtree: use $* instead of $@ as appropriate Luke Shumaker
2021-04-23 20:40 ` Eric Sunshine
2021-04-23 23:50 ` Luke Shumaker
2021-04-24 5:18 ` Eric Sunshine [this message]
2021-04-23 19:42 ` [PATCH 19/30] subtree: give `$(git --exec-path)` precedence over `$PATH` Luke Shumaker
2021-04-26 8:27 ` =?utf-8?B?w4Z2YXIgQXJuZmrDtnLDsA==?= Bjarmason
2021-04-23 19:42 ` [PATCH 20/30] subtree: use "^{commit}" instead of "^0" Luke Shumaker
2021-04-26 7:43 ` Ævar Arnfjörð Bjarmason
2021-04-23 19:42 ` [PATCH 21/30] subtree: parse revs in individual cmd_ functions Luke Shumaker
2021-04-23 19:42 ` [PATCH 22/30] subtree: remove duplicate check Luke Shumaker
2021-04-23 19:42 ` [PATCH 23/30] subtree: add comments and sanity checks Luke Shumaker
2021-04-23 20:58 ` Eric Sunshine
2021-04-23 23:58 ` Luke Shumaker
2021-04-23 19:42 ` [PATCH 24/30] subtree: don't let debug and progress output clash Luke Shumaker
2021-04-23 21:07 ` Eric Sunshine
2021-04-24 0:44 ` Luke Shumaker
2021-04-24 4:54 ` Eric Sunshine
2021-04-23 19:42 ` [PATCH 25/30] subtree: have $indent actually affect indentation Luke Shumaker
2021-04-23 19:42 ` [PATCH 26/30] subtree: give the docs a once-over Luke Shumaker
2021-04-23 19:42 ` [PATCH 27/30] subtree: allow --squash to be used with --rejoin Luke Shumaker
2021-04-24 5:50 ` Eric Sunshine
2021-04-25 0:04 ` Luke Shumaker
2021-04-23 19:42 ` [PATCH 28/30] subtree: allow 'split' flags to be passed to 'push' Luke Shumaker
2021-04-23 19:42 ` [PATCH 29/30] subtree: push: allow specifying a local rev other than HEAD Luke Shumaker
2021-04-23 19:42 ` [PATCH 30/30] subtree: be stricter about validating flags Luke Shumaker
2021-04-25 2:55 ` Danny Lin
2021-04-26 17:35 ` Luke Shumaker
2021-04-23 20:12 ` [PATCH 00/30] subtree: clean up, improve UX Luke Shumaker
2021-04-26 7:55 ` =?utf-8?B?w4Z2YXIgQXJuZmrDtnLDsA==?= Bjarmason
2021-04-27 7:27 ` Junio C Hamano
2021-04-26 17:44 ` [PATCH v2 " Luke Shumaker
2021-04-26 17:44 ` [PATCH v2 01/30] .gitignore: Ignore /git-subtree Luke Shumaker
2021-04-26 17:44 ` [PATCH v2 02/30] subtree: t7900: update for having the default branch name be 'main' Luke Shumaker
2021-04-26 17:44 ` [PATCH v2 03/30] subtree: t7900: use test-lib.sh's test_count Luke Shumaker
2021-04-26 17:44 ` [PATCH v2 04/30] subtree: t7900: use consistent formatting Luke Shumaker
2021-04-26 19:57 ` Luke Shumaker
2021-04-26 17:45 ` [PATCH v2 05/30] subtree: t7900: comment subtree_test_create_repo Luke Shumaker
2021-04-26 17:45 ` [PATCH v2 06/30] subtree: t7900: use 'test' for string equality Luke Shumaker
2021-04-26 17:45 ` [PATCH v2 07/30] subtree: t7900: delete some dead code Luke Shumaker
2021-04-26 17:45 ` [PATCH v2 08/30] subtree: t7900: fix 'verify one file change per commit' Luke Shumaker
2021-04-26 17:45 ` [PATCH v2 09/30] subtree: t7900: rename last_commit_message to last_commit_subject Luke Shumaker
2021-04-26 17:45 ` [PATCH v2 10/30] subtree: t7900: add a test for the -h flag Luke Shumaker
2021-04-26 17:45 ` [PATCH v2 11/30] subtree: t7900: add porcelain tests for 'pull' and 'push' Luke Shumaker
2021-04-26 17:45 ` [PATCH v2 12/30] subtree: don't have loose code outside of a function Luke Shumaker
2021-04-26 17:45 ` [PATCH v2 13/30] subtree: more consistent error propagation Luke Shumaker
2021-04-26 17:45 ` [PATCH v2 14/30] subtree: drop support for git < 1.7 Luke Shumaker
2021-04-26 17:45 ` [PATCH v2 15/30] subtree: use `git merge-base --is-ancestor` Luke Shumaker
2021-04-26 17:45 ` [PATCH v2 16/30] subtree: use git-sh-setup's `say` Luke Shumaker
2021-04-26 17:45 ` [PATCH v2 17/30] subtree: use more explicit variable names for cmdline args Luke Shumaker
2021-04-26 17:45 ` [PATCH v2 18/30] subtree: use "$*" instead of "$@" as appropriate Luke Shumaker
2021-04-26 17:45 ` [PATCH v2 19/30] subtree: Don't fuss with PATH Luke Shumaker
2021-04-26 23:16 ` Luke Shumaker
2021-04-26 17:45 ` [PATCH v2 20/30] subtree: use "^{commit}" instead of "^0" Luke Shumaker
2021-04-26 17:45 ` [PATCH v2 21/30] subtree: parse revs in individual cmd_ functions Luke Shumaker
2021-04-26 17:45 ` [PATCH v2 22/30] subtree: remove duplicate check Luke Shumaker
2021-04-26 17:45 ` [PATCH v2 23/30] subtree: add comments and sanity checks Luke Shumaker
2021-04-26 17:45 ` [PATCH v2 24/30] subtree: don't let debug and progress output clash Luke Shumaker
2021-04-26 17:45 ` [PATCH v2 25/30] subtree: have $indent actually affect indentation Luke Shumaker
2021-04-26 17:45 ` [PATCH v2 26/30] subtree: give the docs a once-over Luke Shumaker
2021-04-26 17:45 ` [PATCH v2 27/30] subtree: allow --squash to be used with --rejoin Luke Shumaker
2021-04-26 19:58 ` Luke Shumaker
2021-04-26 17:45 ` [PATCH v2 28/30] subtree: allow 'split' flags to be passed to 'push' Luke Shumaker
2021-04-26 17:45 ` [PATCH v2 29/30] subtree: push: allow specifying a local rev other than HEAD Luke Shumaker
2021-04-26 17:45 ` [PATCH v2 30/30] subtree: be stricter about validating flags Luke Shumaker
2021-04-27 21:17 ` [PATCH v3 00/30] subtree: clean up, improve UX Luke Shumaker
2021-04-27 21:17 ` [PATCH v3 01/30] .gitignore: Ignore /git-subtree Luke Shumaker
2021-04-27 21:17 ` [PATCH v3 02/30] subtree: t7900: update for having the default branch name be 'main' Luke Shumaker
2021-04-30 9:38 ` Ævar Arnfjörð Bjarmason
2021-04-30 16:07 ` Luke Shumaker
2021-04-27 21:17 ` [PATCH v3 03/30] subtree: t7900: use test-lib.sh's test_count Luke Shumaker
2021-04-30 9:45 ` Ævar Arnfjörð Bjarmason
2021-04-30 16:10 ` Luke Shumaker
2021-04-27 21:17 ` [PATCH v3 04/30] subtree: t7900: use consistent formatting Luke Shumaker
2021-04-27 21:17 ` [PATCH v3 05/30] subtree: t7900: comment subtree_test_create_repo Luke Shumaker
2021-04-30 9:48 ` Ævar Arnfjörð Bjarmason
2021-04-30 16:13 ` Luke Shumaker
2021-04-27 21:17 ` [PATCH v3 06/30] subtree: t7900: use 'test' for string equality Luke Shumaker
2021-04-30 9:55 ` Ævar Arnfjörð Bjarmason
2021-04-30 16:33 ` Luke Shumaker
2021-04-27 21:17 ` [PATCH v3 07/30] subtree: t7900: delete some dead code Luke Shumaker
2021-04-27 21:17 ` [PATCH v3 08/30] subtree: t7900: fix 'verify one file change per commit' Luke Shumaker
2021-04-27 21:17 ` [PATCH v3 09/30] subtree: t7900: rename last_commit_message to last_commit_subject Luke Shumaker
2021-04-30 9:59 ` Ævar Arnfjörð Bjarmason
2021-04-27 21:17 ` [PATCH v3 10/30] subtree: t7900: add a test for the -h flag Luke Shumaker
2021-04-30 10:01 ` Ævar Arnfjörð Bjarmason
2021-04-30 16:40 ` Luke Shumaker
2021-04-30 12:22 ` Bagas Sanjaya
2021-04-30 16:48 ` Luke Shumaker
2021-04-27 21:17 ` [PATCH v3 11/30] subtree: t7900: add porcelain tests for 'pull' and 'push' Luke Shumaker
2021-04-27 21:17 ` [PATCH v3 12/30] subtree: don't have loose code outside of a function Luke Shumaker
2021-04-27 21:17 ` [PATCH v3 13/30] subtree: more consistent error propagation Luke Shumaker
2021-04-27 21:17 ` [PATCH v3 14/30] subtree: drop support for git < 1.7 Luke Shumaker
2021-04-27 21:17 ` [PATCH v3 15/30] subtree: use `git merge-base --is-ancestor` Luke Shumaker
2021-04-27 21:17 ` [PATCH v3 16/30] subtree: use git-sh-setup's `say` Luke Shumaker
2021-04-27 21:17 ` [PATCH v3 17/30] subtree: use more explicit variable names for cmdline args Luke Shumaker
2021-04-27 21:17 ` [PATCH v3 18/30] subtree: use "$*" instead of "$@" as appropriate Luke Shumaker
2021-04-27 21:17 ` [PATCH v3 19/30] subtree: don't fuss with PATH Luke Shumaker
2021-04-27 21:17 ` [PATCH v3 20/30] subtree: use "^{commit}" instead of "^0" Luke Shumaker
2021-04-27 21:17 ` [PATCH v3 21/30] subtree: parse revs in individual cmd_ functions Luke Shumaker
2021-04-27 21:17 ` [PATCH v3 22/30] subtree: remove duplicate check Luke Shumaker
2021-04-27 21:17 ` [PATCH v3 23/30] subtree: add comments and sanity checks Luke Shumaker
2021-04-27 21:17 ` [PATCH v3 24/30] subtree: don't let debug and progress output clash Luke Shumaker
2021-04-27 21:17 ` [PATCH v3 25/30] subtree: have $indent actually affect indentation Luke Shumaker
2021-04-27 21:17 ` [PATCH v3 26/30] subtree: give the docs a once-over Luke Shumaker
2021-04-27 21:17 ` [PATCH v3 27/30] subtree: allow --squash to be used with --rejoin Luke Shumaker
2021-04-27 21:17 ` [PATCH v3 28/30] subtree: allow 'split' flags to be passed to 'push' Luke Shumaker
2021-04-27 21:17 ` [PATCH v3 29/30] subtree: push: allow specifying a local rev other than HEAD Luke Shumaker
2021-04-27 21:17 ` [PATCH v3 30/30] subtree: be stricter about validating flags Luke Shumaker
[not found] ` <CAAgkN4cKUSPKpwuaLG-vR5Z7WFUZ81QXuRcsX-10obaRBAvwBA@mail.gmail.com>
2021-04-28 0:24 ` Luke Shumaker
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