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From: Jeff King <peff@peff.net>
To: Yoichi Nakayama <yoichi.nakayama@gmail.com>
Cc: Yoichi Nakayama via GitGitGadget <gitgitgadget@gmail.com>,
	git@vger.kernel.org
Subject: Re: [PATCH v4 2/2] git-jump: invoke emacs/emacsclient
Date: Thu, 24 Nov 2022 11:31:54 -0500	[thread overview]
Message-ID: <Y3+cepfUpi0vm7yM@coredump.intra.peff.net> (raw)
In-Reply-To: <CAF5D8-vXK81U_n06u=p=B9urTWyQ5+fN8_w9FeCWQOv1xen07Q@mail.gmail.com>

On Thu, Nov 24, 2022 at 09:58:04PM +0900, Yoichi Nakayama wrote:

> > The original vim version used the notation \$1 instead of $1.
> > I'm worried that the emacs version might need the backslash.
> > What does the backslash mean? Is it necessary?
> 
> I found the answer myself. The backslash is to leave the
> evaluation of the argument to the 'eval' execution.
> And another question arose. Why do we use eval?
> What is the difference from running it directly like below?
>     $editor -q $1

The value of $editor is not a single program name, but is itself a shell
command. So you could imagine:

  git config core.editor "some_command --with --args"

or even more complicated shell hackery. From within Git, we'd run it as:

  sh -c "some_command --with --args"

but when you are in a shell already, "eval" is a more efficient way of
doing the same.

-Peff

  reply	other threads:[~2022-11-24 16:32 UTC|newest]

Thread overview: 68+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-11-19 14:02 [PATCH 0/2] git-jump: support Emacs Yoichi NAKAYAMA via GitGitGadget
2022-11-19 14:02 ` [PATCH 1/2] git-jump: add an optional argument 'stdout' Yoichi Nakayama via GitGitGadget
2022-11-19 14:02 ` [PATCH 2/2] git-jump: invoke emacsclient Yoichi Nakayama via GitGitGadget
2022-11-19 15:53   ` Eric Sunshine
2022-11-19 23:44     ` Yoichi Nakayama
2022-11-19 23:59       ` Eric Sunshine
2022-11-21  4:05         ` Yoichi Nakayama
2022-11-20  1:27 ` [PATCH v2 0/2] git-jump: support Emacs Yoichi NAKAYAMA via GitGitGadget
2022-11-20  1:27   ` [PATCH v2 1/2] git-jump: add an optional argument 'stdout' Yoichi Nakayama via GitGitGadget
2022-11-21  5:43     ` Junio C Hamano
2022-11-21 11:25       ` Yoichi Nakayama
2022-11-21 18:18       ` Jeff King
2022-11-20  1:27   ` [PATCH v2 2/2] git-jump: invoke emacsclient Yoichi Nakayama via GitGitGadget
2022-11-21 12:26   ` [PATCH v3 0/2] git-jump: support Emacs Yoichi NAKAYAMA via GitGitGadget
2022-11-21 12:26     ` [PATCH v3 1/2] git-jump: add an optional argument '--stdout' Yoichi Nakayama via GitGitGadget
2022-11-21 18:38       ` Jeff King
2022-11-21 23:38         ` Junio C Hamano
2022-11-22 13:00           ` Yoichi Nakayama
2022-11-22 18:23             ` Jeff King
2022-11-22 13:29         ` Yoichi Nakayama
2022-11-21 12:27     ` [PATCH v3 2/2] git-jump: invoke emacs/emacsclient Yoichi Nakayama via GitGitGadget
2022-11-21 18:50       ` Jeff King
2022-11-22 12:06         ` Yoichi Nakayama
2022-11-22 14:18     ` [PATCH v4 0/2] git-jump: support Emacs Yoichi NAKAYAMA via GitGitGadget
2022-11-22 14:18       ` [PATCH v4 1/2] git-jump: add an optional argument '--stdout' Yoichi Nakayama via GitGitGadget
2022-11-22 18:30         ` Jeff King
2022-11-22 14:18       ` [PATCH v4 2/2] git-jump: invoke emacs/emacsclient Yoichi Nakayama via GitGitGadget
2022-11-22 16:40         ` Phillip Wood
2022-11-23  5:01           ` Yoichi Nakayama
2022-11-22 18:54         ` Jeff King
2022-11-23  5:33           ` Yoichi Nakayama
2022-11-24  1:09             ` Jeff King
2022-11-24 12:32               ` Yoichi Nakayama
2022-11-24 12:58                 ` Yoichi Nakayama
2022-11-24 16:31                   ` Jeff King [this message]
2022-11-24 16:29                 ` Jeff King
2022-11-25  3:46                   ` Yoichi Nakayama
2022-11-23  7:04       ` [PATCH v5 0/3] git-jump: support Emacs Yoichi NAKAYAMA via GitGitGadget
2022-11-23  7:04         ` [PATCH v5 1/3] git-jump: add an optional argument '--stdout' Yoichi Nakayama via GitGitGadget
2022-11-23  7:04         ` [PATCH v5 2/3] git-jump: move valid-mode check earlier Jeff King via GitGitGadget
2022-11-23  7:04         ` [PATCH v5 3/3] git-jump: invoke emacs/emacsclient Yoichi Nakayama via GitGitGadget
2022-11-23 14:58           ` Phillip Wood
2022-11-23 21:54             ` Yoichi Nakayama
2022-11-24  1:11         ` [PATCH v5 0/3] git-jump: support Emacs Jeff King
2022-11-24  3:47         ` [PATCH v6 " Yoichi NAKAYAMA via GitGitGadget
2022-11-24  3:47           ` [PATCH v6 1/3] git-jump: add an optional argument '--stdout' Yoichi Nakayama via GitGitGadget
2022-11-24  3:47           ` [PATCH v6 2/3] git-jump: move valid-mode check earlier Jeff King via GitGitGadget
2022-11-24  3:47           ` [PATCH v6 3/3] git-jump: invoke emacs/emacsclient Yoichi Nakayama via GitGitGadget
2022-11-25  3:36           ` [PATCH v7 0/3] git-jump: support Emacs Yoichi NAKAYAMA via GitGitGadget
2022-11-25  3:36             ` [PATCH v7 1/3] git-jump: add an optional argument '--stdout' Yoichi Nakayama via GitGitGadget
2022-11-25  9:06               ` Ævar Arnfjörð Bjarmason
2022-11-27  0:31                 ` Yoichi Nakayama
2022-11-25  3:37             ` [PATCH v7 2/3] git-jump: move valid-mode check earlier Jeff King via GitGitGadget
2022-11-25  3:37             ` [PATCH v7 3/3] git-jump: invoke emacs/emacsclient Yoichi Nakayama via GitGitGadget
2022-11-25  8:55               ` Ævar Arnfjörð Bjarmason
2022-11-25 16:01                 ` Yoichi Nakayama
2022-11-25 23:52                   ` Ævar Arnfjörð Bjarmason
2022-11-28  5:10                     ` Jeff King
2022-11-28 10:54                       ` Ævar Arnfjörð Bjarmason
2022-11-28 15:38                         ` Yoichi Nakayama
2022-11-27  0:37                   ` Yoichi Nakayama
2022-11-27  1:18             ` [PATCH v8 0/3] git-jump: support Emacs Yoichi NAKAYAMA via GitGitGadget
2022-11-27  1:18               ` [PATCH v8 1/3] git-jump: add an optional argument '--stdout' Yoichi Nakayama via GitGitGadget
2022-11-27  1:18               ` [PATCH v8 2/3] git-jump: move valid-mode check earlier Jeff King via GitGitGadget
2022-11-27  1:18               ` [PATCH v8 3/3] git-jump: invoke emacs/emacsclient Yoichi Nakayama via GitGitGadget
2022-11-28 10:13               ` [PATCH v8 0/3] git-jump: support Emacs Phillip Wood
2022-11-28 23:35                 ` Junio C Hamano
2022-11-29 21:05                 ` Yoichi Nakayama

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