From: Sebastian Miele <iota@whxvd.name>
To: Greg Minshall <minshall@umich.edu>
Cc: emacs-devel@gnu.org
Subject: Re: Emacs script options
Date: Sat, 18 Nov 2023 20:18:00 +0100 [thread overview]
Message-ID: <8734x2zwnc.fsf@whxvd.name> (raw)
In-Reply-To: <1325582.1700277236@archlinux>
> From: Greg Minshall <minshall@umich.edu>
> Date: Fri, 2023-11-17 19:13 -0800
>
> hi. i would like to be able to write Emacs scripts ("#!...") that allow
> a user to enter almost any option to the script itself, *without* having
> to use double dashes ("--") to avoid colliding with Emacs option
> processing.
>
> looking at "--script" and "-x", this doesn't seem possible.
>
> as a test case, given a simple script foo.sh (*), using "-x", and
> invoking it with an option "--eval" gives this error:
>
> ----
> % ./foo.sh --eval
> emacs: Option '--eval' requires an argument
> ----
>
> (that bare "--eval" *should* be an error if it were meant for Emacs
> itself; however, it is meant for the Emacs script, which may have other
> ideas of the syntax/semantics of "--eval".)
>
> the below patch to src/emacs.c (**) treats a "-x" (and its "partner"
> "-scripteval") like a "--" on the command line, and *seems* to allow
> arbitrary options on the command line. for example, with this patch
> installed:
>
> ----
> % ./foo.sh --eval
> command-line-args-left (--eval)
> ----
On Linux that can be achieved by defining a custom interpreter. E.g.,
put the following into ‘/path/to/emacs-script’:
#!/bin/sh
script=$1
shift
exec emacs -Q --batch --load $script -- "$@"
Then, with the following in a ‘test-script’
#!/path/to/emacs-script
;; -*- mode: emacs-lisp; lexical-binding: t -*-
(message "%s" command-line-args-left)
‘test-script --eval’ prints "(-- --eval)".
On Linux, and when ‘emacs-script’ is in the PATH, the ‘/path/to/’ in the
shebang even can be omitted.
However, the workaround is not possible on at least some non-Linux
systems, because not all systems allow something interpreted as an
interpreter in a shebang, see
https://en.wikipedia.org/wiki/Shebang_(Unix)#Syntax.
next prev parent reply other threads:[~2023-11-18 19:18 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-11-18 3:13 (unknown) Greg Minshall
2023-11-18 7:05 ` (unknown) Jim Porter
2023-11-18 14:10 ` (unknown) -x behavior change Greg Minshall
2023-11-18 7:36 ` Emacs script options Eli Zaretskii
2023-11-18 14:38 ` Greg Minshall
2023-11-18 16:20 ` Eli Zaretskii
2023-11-18 19:36 ` Greg Minshall
2023-11-19 5:55 ` Eli Zaretskii
2023-11-27 3:29 ` Greg Minshall
2023-11-27 12:59 ` Eli Zaretskii
2023-11-27 19:32 ` Greg Minshall
2023-11-18 19:18 ` Sebastian Miele [this message]
2023-11-18 19:49 ` Greg Minshall
2023-11-19 21:39 ` Jens Schmidt
2023-11-19 21:47 ` Jens Schmidt
2023-11-20 1:19 ` Greg Minshall
2023-11-21 21:13 ` Jens Schmidt
2023-11-22 18:17 ` Sebastian Miele
2023-11-22 20:18 ` Jens Schmidt
2023-11-24 4:22 ` Greg Minshall
2023-11-26 18:07 ` Jens Schmidt
2023-11-20 6:10 ` Sebastian Miele
2023-11-20 20:10 ` Jens Schmidt
2023-11-21 8:51 ` Sebastian Miele
2023-11-19 5:04 ` Bob Rogers
2023-11-19 6:21 ` Eli Zaretskii
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