Hi,
On Thu, May 27, 2010 at 3:28 PM, Jim Menard <jim.men...@gmail.com> wrote:
> I've given some functions metadata that I want to use elsewhere. My
> problem is, I don't see the metadata I've added if I use or require
> the namespace; I need to explicitly load the file (or eval the
> function definitions manually in slime/swank) to see the metatada.
> Here's some simple code that shows my problem. What am I doing wrong,
> or not understanding about metadata?
>
> ;;; ================ src/ctest/funcs.clj ================
> (ns ctest.funcs)
>
> (defn
> #^{:wadl {:url "/f1" :method "GET" :doc "The f1 function."}}
> f1 [] 42)
>
> (defn
> #^{:wadl {:url "/f2" :method "GET" :doc "The f2 function."}}
> f2 [] "eleventy-seven")
>
> ;;; ================ src/ctest/core.clj ================
> (ns ctest.core
> (:use ctest.funcs))
>
> (def wadl-meta (list (meta ctest.funcs/f1) (meta ctest.funcs/f2)))
>
There is indeed a bug in how defn copy metadata from the var to the fn:
user=> (defn foo {:bar :baz} [] 42)
#'user/foo
user=> (meta #'foo)
{:ns #<Namespace user>, :name foo, :file "NO_SOURCE_PATH", :line 221,
:arglists ([]), :bar :baz}
user=> (meta foo)
{:ns #<Namespace user>, :name foo}
user=> (defn foo {:lucy :ethel} [] 43)
#'user/foo
user=> (meta #'foo)
{:ns #<Namespace user>, :name foo, :file "NO_SOURCE_PATH", :line 224,
:arglists ([]), :lucy :ethel}
user=> (meta foo)
{:ns #<Namespace user>, :name foo, :file "NO_SOURCE_PATH", :line 221,
:arglists ([]), :bar :baz}
There you see that the fn got the previous metadata and not the current. I'm
going to open a ticket.
Christophe
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