Re: appearance of list as results from evaluating code blocks

[John Kitchin <jkitchin@andrew.cmu.edu>]

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I think something is fishy in ob-clojure.

When I look at how it runs, it is not obvious it is returning anything.
Instead it is wrapping the body like this

"(clojure.pprint/pprint (do (list 1 2 (+ 1 2))))"

which I assume is going to stdout maybe?

With Cider I eventually got to this intermediate result, which looks like
maybe there is a terminating nil getting read from the repl that is
eventually chomped to "".

Result: (dict "status" ("done" "state") "id" "12" "out" "(1 2 3)\nnil\n"
"session" "c72a3a11-8982-4ead-a0bf-cb92a24a966c" "ns" "user" "value" "nil"
"changed-namespaces" (dict) "repl-type" "clj")

That is my best guess for why you don't see the output. This happens in the
function ob-clojure-eval-with-cider.
John

-----------------------------------
Professor John Kitchin (he/him/his)
Doherty Hall A207F
Department of Chemical Engineering
Carnegie Mellon University
Pittsburgh, PA 15213
412-268-7803
@johnkitchin
http://kitchingroup.cheme.cmu.edu



On Thu, Jun 24, 2021 at 1:47 PM Johannes Brauer <brauer@nordakademie.de>
wrote:

> Hi John!
>
> There is no „return“ in Lisp languages. The return value of (list 1 2 3)
> is (1 2 3). Clojure is a Lisp language similar to Elisp. So
>
> #+begin_src clojure :results code
>> (list 1 2 (+ 1 2))
>>   #+end_src
>>
>
> should work for Clojure as it does für Elisp.
>
> Johannes
>
>
> Am 24.06.2021 um 18:28 schrieb John Kitchin <jkitchin@andrew.cmu.edu>:
>
> That probably means the clojure block is returning nil as the value. I
> don't know what it means to return something in clojure, but here is what
> you have to do with Python, for example.
>
> #+BEGIN_SRC python :results value code
> [1, 2, 3]
> #+END_SRC
>
> #+RESULTS:
> #+begin_src python
> None
> #+end_src
>
> You have to explicitly return a value to see it.
>
> #+BEGIN_SRC python :results value code
> return [1, 2, 3]
> #+END_SRC
>
> #+RESULTS:
> #+begin_src python
> [1, 2, 3]
> #+end_src
>
>
> John
>
> -----------------------------------
> Professor John Kitchin (he/him/his)
> Doherty Hall A207F
> Department of Chemical Engineering
> Carnegie Mellon University
> Pittsburgh, PA 15213
> 412-268-7803
> @johnkitchin
> http://kitchingroup.cheme.cmu.edu
>
>
>
> On Thu, Jun 24, 2021 at 10:31 AM Johannes Brauer <brauer@nordakademie.de>
> wrote:
>
>> What about :results code
>> The default is a elisp code block so you get syntax coloring
>>
>>
>> That works fore lisp:
>>
>>   #+begin_src elisp :results code
>> (list 1 2 (+ 1 2))
>>   #+end_src
>>
>>   #+RESULTS:
>>   #+begin_src elisp
>>   (1 2 3)
>>   #+end_src
>>
>> But with Clojure I get
>>
>>   #+begin_src clojure :results code
>> (list 1 2 (+ 1 2))
>>   #+end_src
>>
>>   #+RESULTS:
>>   #+begin_src clojure
>>   nil
>>   #+end_src
>>
>>
>

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