def interns the var at compile time, binding is a runtime operation
> On 2 Dec 2015, at 16:56, Gregg Reynolds <d...@mobileink.com> wrote:
>
>
>
> On Wed, Dec 2, 2015 at 8:11 AM, gianluca torta <giato...@gmail.com> wrote:
> for some reason, it looks like the implementation of the ns macro assumes
> that the macro itself is being defined in namespace clojure.core
>
> try defining myns in the namespace clojure.core, and it should work
>
> Thanks, Gianluca. I tried that but def macros don't seem to respect
> rebinding *ns*.
>
> (ns foo)
> (println *ns*) ;; => #object[clojure.lang.Namespace 0x73eb2c69 foo]
> (binding [*ns* (create-ns 'clojure.core)]
> (println *ns*) ;; => #object[clojure.lang.Namespace 0x255f1d1 clojure.core]
> (def bar "i should be in clojure.core!")
> (println (var bar))) ;; => #'foo/bar
>
> I also tried in-ns and with-redefs to no avail.
>
> Interning seems to work:
>
> (ns foo)
> (defmacro co-ns
> ... code from clojure.core/defmacro ns...)
> (intern 'clojure.core (with-meta 'co-ns {:macro true}) @#'co-ns)
>
> This puts the co-ns macro in clojure.core, but I still have to qualify the
> call: foo/co-ns or clojure.core/co-ns. I haven't been able to get (co-ns
> ...) to work at top of file, but maybe it's better to qualify it anyway.
>
> In the end it's embarrasingly simple:
>
> ;; foo.clj
> (ns foo)
> (defmacro co-ns
> [name & references]
> ;; customizing code here...
> (doseq [ref references] (println ref))
> `(ns ~name ~@references)
> ;; ... and here
> (println "hello CONS"))
> (intern 'clojure.core (with-meta 'co-ns {:macro true}) @#'co-ns)
>
> and the interning bit isn't even necessary. This makes it easy to add ref
> keywords, e.g. (foo/co-ns (:require ...) (:my-ref ...))
>
> Thanks,
>
> Gregg
>
>
>
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