Oh yes you guys are right. I should have look at the source first:
(defmacro dir
"Prints a sorted directory of public vars in a namespace"
[nsname]
`(doseq [v# (dir-fn '~nsname)]
(println v#)))
from it, we can see the "quote" thing. Thank you all. I got it now!
On Oct 27, 5:12 pm, Ben Smith-Mannschott <bsmith.o...@gmail.com>
wrote:
> dir is a macro. It doesn't evaluate its arguments. So when you say
> (dir *ns*), Clojure sees: show me what's in the namespace named
> "*ns*", and there is no such namespace because *ns* is the name of a
> variable which contains the name of the current namespace.
>
> Dir is this way because for interactive use, it's convenient not to
> have to quote the symbol naming the namespace. So (dir user) and (dir
> clojure.core) should work.
>
> In your situation you'll want to call dir-fn, which is a function that
> will evaluate its arguments, so:
>
> if we assume (= *ns* 'user) (i.e. you're currently in the namespace "user")
> (dir-fn *ns*)
> is equivalent to
> (dir-fn 'user)
> and
> (dir user)
>
> HTH
> // Ben
>
>
>
>
>
>
>
> On Thu, Oct 27, 2011 at 10:57, jaime <xiejianm...@gmail.com> wrote:
> > Hi there, when I tried to execute "(dir *ns*)" in REPL, I found it
> > doesn't work -- with exception of:
> > Exception No namespace: *ns* found clojure.core/the-ns
> > (core.clj:3689)
> > I'm not sure if I used it the right way. Following are my execution
> > tries:
> > =============================================================
> > Clojure 1.3.0
> > user=> (doc dir)
> > -------------------------
> > clojure.repl/dir
> > ([nsname])
> > Macro
> > Prints a sorted directory of public vars in a namespace
> > nil
> > user=> (dir *ns*)
> > Exception No namespace: *ns* found clojure.core/the-ns (core.clj:
> > 3689)
> > user=> *ns*
> > #<Namespace user>
> > user=> (the-ns *ns*)
> > #<Namespace user>
> > user=> (the-ns 'user)
> > #<Namespace user>
> > user=>
> > =============================================================
> > Any suggestions??
>
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