Question about macros

[jeremys]

Hi,

I have a question about the macro system. I wanted to write a macro for the meteor api with the following behavior:

(deftemplatehelpers foo

  {bar: "baz"

   fooo: (function () 3)})

expands to somthing like:

(Template.foo.helpers

  {bar: "baz"

   fooo: (function () 3)})

The goals is to have a shortcut to create template helpers functions.

Can I do that? How?

.

Cheers,

Jeremys

[Santosh Rajan]

Use LispyScript `object` instead of Javascript object literal. And use . notation.

See docs for both.

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[jeremys]

the macro looks like this now:

(macro deftemplateHelpers (tpl rest...)

       (Template.~tpl.helpers

(object ~rest...)))

(deftemplateHelpers foo 

   bar "baz"

   fooo (function () 3))

compiles to

Template.~tpl.helpers({

    bar: "baz",

    fooo: function() {

        return 3;

    }

});

and doesn't work because of the "Template.~tpl.helpers" part. How can I have "Template.foo.helpers" the desired effect with the . notation ?

[Santosh Rajan]

(macro deftemplateHelpers (tpl rest...)

      ( (.helpers (~tpl Template)

(object ~rest...))))

(deftemplateHelpers .foo 

   bar "baz"

   fooo (function () 3))

notice i am using '.foo' as the ar to the macro.

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[jeremys]

Thanks a lot Santosh it's a big help to make neet little DSLs for meteor. Sorry to pick your brain so much

but I am more used to clojure macros, I needed some tips !

Thanks again !

[Santosh Rajan]

You can't use '.' in a clojure token. So it is just about getting used to that.

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