Sv: Sv: Christmas wish: Literate Elisp

[arthur miller <arthur.miller@live.com>]

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Hello again,

I was able to make readevalloop do what I want. It was rather trivial to
implement this (once I realized how it works 🙂). Emacs built fine and I was
able to test wtih eval-buffer and eval-regionwhich worked as intended.

It was just 4 code lines, I just copied codeto parse comment and change the
condition in if-statement:

(message "Hello, World!")

(message "Hello Again!")

In code blocs the ';' is still a comment delimiter:

(message
 ;; Here is a line comment
 "I am a bit chatty today!")

That's it for today folks!

(message "Bye bye cruel world!")

This email was composed in scratch buffer and executed during writing with
eval-buffer for testing.

However, byte compiler is not happy about this. It emits warnings
for every word out of code blocks as references to free variables. I am not sure
where to look to patch it, maybe another day.
________________________________
Från: Stefan Monnier <monnier@iro.umontreal.ca>
Skickat: den 14 december 2019 15:08
Till: arthur miller <arthur.miller@live.com>
Kopia: emacs-devel <emacs-devel@gnu.org>; archambv@iro.umontreal.ca <archambv@iro.umontreal.ca>
Ämne: Re: Sv: Christmas wish: Literate Elisp

arthur miller [2019-12-14 04:40:30] wrote:

> To be honest my contact with Haskell broke once the university course, some
> 20 yrs ago was over, so I am a little bit illiterate about Haskells sexy
> packages.  I just recalled that it was possible to invert text and code in
> Haskell.  But cool.

The fact that it's written is Haskell is just incidental.

> Didn't know there is a package to let load org files directly either.

Hmm... The closest I can find is https://github.com/jingtaozf/literate-elisp/
but it doesn't quite match what I think I was referring to.


        Stefan


> Thanks for the answers.
> ________________________________
> Från: Stefan Monnier <monnier@iro.umontreal.ca>
> Skickat: den 12 december 2019 18:29
> Till: arthur miller <arthur.miller@live.com>
> Kopia: emacs-devel <emacs-devel@gnu.org>; archambv@iro.umontreal.ca <archambv@iro.umontreal.ca>
> Ämne: Re: Christmas wish: Literate Elisp
>
>> My proposal is to slightly change Elisp parser to treat lines that start
>> with any other printable character but '(' as a start of comment and to
>> simply ignore the line, just as it treats ';' as a comment.
>
> The `sexpresso` Haskell package follows the same idea ;-)
>
> As for using it in Elisp: I don't think there's anything stopping anyone
> from making such a `literate-elisp-mode` and even arrange for `load` to
> handle such a file (just like there is already a package that lets
> `load` work directly on .org files).
>
> I'd welcome such a package in GNU ELPA.
>
>
>         Stefan


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--- lread.c	2019-12-16 12:52:05.739490741 +0100
+++ mylread.c	2019-12-16 12:50:46.572077138 +0100
@@ -2053,6 +2053,12 @@
 	  || c == NO_BREAK_SPACE)
 	goto read_next;
 
+      if (c != '(' && c != '#')
+	{
+	  while ((c = READCHAR) != '\n' && c != -1);
+	  goto read_next;
+	}
+
       if (! HASH_TABLE_P (read_objects_map)
 	  || XHASH_TABLE (read_objects_map)->count)
 	read_objects_map