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

[Maxime Devos]

> > In Racket, in the initial configuration of the reader when reading a file, "`#!` is an alias 
> > for `#lang` followed by a space when `#!` is followed by alphanumeric ASCII, `+`, `-`, or 
> > `_`." (See 
> > <https://docs.racket-lang.org/reference/reader.html#%28part._parse-reader%29>.) [...] > 
> > (Guile does not handle `#!r6rs` properly, presumably because of the legacy `#!`/`!#` block 
> > comments. I think this should be a surmountable obstacle, though, especially since Guile does 
> > support standard `#|`/`|#` block comments.)
>
> ‘#! ... !#’ comments aren't legacy; they exist to allow putting the shebang in the first 
> line of a script, and to pass additional arguments to the Guile interpreter (see: 
> (guile)The Top of a Script File) (*).  As such, you can't just replace them with #| ... 
> |# (unless you patch the kernel to recognise "#| ..." as a shebang line). [...]
>
> Furthermore, according to the kernel, #!r6rs would mean that the script needs 
> to be interpreted by a program named 'r6rs', but 'guile' is named 'guile', not 
> 'r6rs'.  (I assume this is in POSIX somewhere, though I couldn't find it.)
>
> (This is an incompatibility between R6RS and any system that has shebangs.)

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.)

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.)

Greetings,
Maxime.

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