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Re: [PATCH] add language/wisp to Guile?

From: Maxime Devos
Subject: Re: [PATCH] add language/wisp to Guile?
Date: Thu, 23 Feb 2023 19:04:11 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.7.0

On 23-02-2023 09:51, Dr. Arne Babenhauserheide wrote:
Thinking a bit more about it, it should be possible to special-case
Guile's interpretation of "#!" such that "#!r6rs" doesn't require a
closing "!#".  (Technically backwards-incompatible, but I don't think
people are writing #!r6rs ...!# in the wild.)
Do you need the closing !# if you restrict yourself to the first line?

I thought so at first, but doing a little experiment, it appears you don't need to:

$ guile
scheme@(guile-user)> #!r6rs
(display "hi") (newline)

(output: hi)

Apparently Guile already has required behaviour.

Still doesn't really address the problem though, as Scheme scripts (or
scripts in another language) may need to start with a shebang and
"#!lang" or "#lang" is not a valid comment in all languages.  (E.g., I
don't think it's valid Pascal, though I only have read some Pascal
code, I haven't looked at the specification.)
I think itmust be ignored in all languages that work as scripts in
POSIX. So I would expect that support for ignoring #!... in the first
line is very widespread.

The problem is that not all languages were made with POSIX-style scripts in mind, e.g. Pascal, BASIC and Java (*).


(*) Java actually allows "#!", but only in 'Shebang' files (see: It remains invalid to put a '#!java' line in files with a class definition that is supposed to be found by Java's class loaders and compiler (in Guile terms, the source code of a module).

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