Alan,
Something like this might work for you -
(defmacro eval-in
"Eval a Clojure form in a different namespace and switch back to
current namespace.
Args:
code - Clojure form as string
ns - Target namespace as string"
[code ns]
`(do
(in-ns '~(symbol ns))
(let [ret# (eval '~(read-string code))]
(in-ns '~(ns-name *ns*))
ret#)))
Warning - I haven't really tested this code.
-BG
On Tue, Dec 18, 2012 at 12:37 PM, Alan Shaw <[email protected]> wrote:
> Thanks, Las!
>
> Ok say I have a file in which there is string such as
>
> "(- (atan (bw-noise 902 2 0.7604615575402431 400 400)) (read-image-from-file
> \"images/Dawn_on_Callipygea.png\"))"
>
> and another
>
> "version-0-0-1"
>
> and I have a namespace version-0-0-1 into which functions named atan etc.
> are all :referred. I want to evaluate the expression in that particular
> context, and not remain there when I'm done.
>
> -A
>
>
>
> On Mon, Dec 17, 2012 at 11:00 PM, László Török <[email protected]> wrote:
>>
>> ah, sorry, it's a bit early for me
>>
>> (in-ns (ns-name user-ns))
>>
>> if you could post a simple example for the second part of your question I
>> maybe able to help.
>>
>> Las
>>
>> Alan Shaw 2012. december 18., kedd napon a következőt írta:
>>
>>> Ah no, that puts me in a new user-ns namespace! Not what I wanted!
>>>
>>>
>>> On Mon, Dec 17, 2012 at 10:51 PM, László Török <[email protected]>
>>> wrote:
>>>>
>>>> Try (in-ns 'user-ns)
>>>>
>>>> Las
>>>>
>>>> On Dec 18, 2012 7:50 AM, "Alan Shaw" <[email protected]> wrote:
>>>>>
>>>>> user=> *ns*
>>>>> #<Namespace user>
>>>>> user=> (def user-ns *ns*)
>>>>> #'user/user-ns
>>>>> user=> user-ns
>>>>> #<Namespace user>
>>>>> user=> (in-ns user-ns)
>>>>> ClassCastException clojure.lang.Namespace cannot be cast to
>>>>> clojure.lang.Symbol clojure.lang.RT$1.invoke (RT.java:226)
>>>>>
>>>>> It appears I'm not understanding how namespaces are represented.
>>>>>
>>>>> Also, is it just wrong of me to want to remember a namespace I was
>>>>> working in and try to go back to it later?
>>>>>
>>>>> The slightly larger context is: I'm saving an s-expression with
>>>>> unqualified names in it into a file as a string. Also saving a string
>>>>> indicating the name of the environment in which that string should be
>>>>> (read
>>>>> and) eval'ed so that the names will resolve to the appropriate functions.
>>>>> Advice on managing this would be appreciated.
>>>>>
>>>>> -Alan Shaw
>>>>>
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>>
>>
>>
>> --
>> László Török
>>
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>
>
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--
Baishampayan Ghose
b.ghose at gmail.com
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