I think the following is “looked down upon” or “discouraged“, but I
managed to sift through how clojure itself handles its own stuff in
java and I came up with the following.
Say, that you want to set *out*, *in*, and *err* in clojure to
something from Java before starting a REPL. Here is how I passed on
these values to the clojure RT:
try {
Var.pushThreadBindings(RT.map(
RT.OUT, new OutputStreamWriter(MYout),
RT.IN, new LineNumberingPushbackReader(new InputStreamReader(MYin)),
RT.ERR, new PrintWriter(new OutputStreamWriter(MYout), true)));
main.main(new String[] {"-r"});
} catch (Exception e) {}
finally {
Var.popThreadBindings();
}
Don’t forget to import (after setting clojure.jar on the cp).
import clojure.main;
import clojure.lang.RT;
import clojure.lang.Var;
Note that the doc-string of the clojure (repl function allows for
hooks for some of what you want. You just need to look into how you
could pass on those functions for :need-
prompt, :prompt, :flush, :read in a way that clojure can digest, which
I think is just a Runnable in a map of sorts. But you’ll have to look
into that to be sure.
Regardless, I highly recommend that you separate Java from clojure
coding as mush as possible, or at least treat clojure in a functional
way when touching it from Java.
I hope this helps. If someone else has a better way, I’m all ears.
On Dec 7, 8:19 am, Mike <cki...@gmail.com> wrote:
> I've seen an example of launching a Clojure script from Java (http://
> en.wikibooks.org/wiki/Clojure_Programming/
> Tutorials_and_Tips#Invoking_Clojure_from_Java), but I've got an
> application in which I'd like to run a REPL.
>
> My app has its own JPanel for display results, and a text area for
> input, so I'll need to start repl with some replacement callback
> functions (read, print, prompt, need-prompt). I'd like to code as
> much as possible in Clojure, but at some point I need to pass in some
> Java object instances that my wrapper functions will use to perform I/
> O for the repl.
>
> Has anyone done this recently? Could someone point me in the right
> direction for exposing Java objects into Clojure? I've tried reading
> main.java and RT.java looking for hints, but I'm not too smart yet
> about the Clojure environment, the scope of when things live, and
> such.
>
> Thanks in advance for any hints...
> Mike
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