Strange macro behavior

[sjl]

I'm trying to make a simple macro to save myself some typing:

(macro onload (body...)
  ($ (function ()
       ~@body...
       null)))

(onload
  (alert (+ 1 2))
  (alert (+ 2 3)))

($ (function ()
     (alert (+ 1 2))
     (alert (+ 2 3))
     null))

I expect the onload form to expand into something like the last form there, and then get compiled. But when I compile this I get the following javascript:

// Generated by LispyScript v0.2.9
$(function() {
    alert;
    (1 + 2);
    return null;
});
$(function() {
    alert((1 + 2));
    alert((2 + 3));
    return null;
});

I have no idea what the heck is happening here since Lispyscript macros are a templating language instead of real Lisp macros (and aren't really documented (I think the ~@ char splices?)). Is this a bug or am I doing something wrong?

[santoshrajan]

use rest... and ~rest... to dereference. rest... is a special case that will have the rest of the expressions bound to it. No need to use @ to dereference it.

[sjl]

Oh god, I figured it out. The name rest... is somehow magical. If I rename body... to rest... it works. Could you maybe document that somewhere?

[santoshrajan]

It is documented in the let macro example in the macro docs. But yes I need to improve the docs though. Maybe not very clear. Thanks.

[sjl]

Happening to use the name "rest..." in an example is not the same as saying "the name rest... is treated specially". I read the example but just thought you picked "rest" because you felt like it.

On Nov 17, 2012, at 1:44 AM, Santosh Rajan notifications@github.com wrote:

It is documented in the let macro example in the macro docs. But yes I need to improve the docs though. Maybe not very clear. Thanks.

— Reply to this email directly or view it on GitHub.

[santoshrajan]

Yes I will make it explicit in the docs. Thanks.