Re: C++ sessions for Babel with cling interpreter

[Martin Alsinet <martin@alsinet.com.ar>]

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Hello Garjola:

I have not used C++ source blocks, but I use them frequently with
Javascript and Python, and I don't use sessions.
The thing is, for literate programming, we want to include the code from
one source block in others, and it would seem that sessions are the
solution.
However, I find that for me it is better to use tangle to export the code
to source files and then include the tangled files from the other source
blocks.

Example:

#+BEGIN_SRC js :tangle src/hello.js
function hello(text) {
    console.log("hello " + text);
}
module.exports = hello;
#+END_SRC

First I have to run *org-babel-tangle* to export all source blocks to
files, and then I can include them in other blocks.

#+BEGIN_SRC js
const hello = require("./src/hello.js");
hello("Martin");
#+END_SRC

From what I remember, it is possible to do the same in C++, including the
source files you need from the filesystem.
In my opinion, this approach is better than sessions, because the problem
with sessions is that you have to make sure the blocks are executed
secuentially in the right order to build the "state" that allows you to run
your current block. This way each block is independent of all others, worst
case you have to run org-babel-tangle to create the required files.

Regards,


Martín


On Sun, Nov 5, 2017 at 12:13 PM <garjola@garjola.net> wrote:

> Hi all,
>
> I use C++ source code blocks in babel frequently and I am very happy with
> the results. As C++ is a compiled language, ob-C.el does not support
> sessions.
>
> Unfortunately, this breaks a little my litterate programming workflow,
> since I don't know how to use small code snippets without sessions.
>
> I have recently discovered cling [1], [2] a C++ interpreter which comes
> with de Root package [3]. I have also found a cling inferior mode [4] to
> interact with the interpreter in a comint buffer.
>
> I was wondering if it would be difficult to update ob-C.el to use cling
> for session support. My elisp knowledge is too poor to understand what is
> involved in doing such a thing, but I would be interested in trying or
> helping somebody do it. Unfortunately, I have the impression that the
> developers of ob-C.el are not around this list anymore?
>
> I would very much appreciate suggestions on how to proceed.
>
> Thank you.
>
> Garjola.
>
> Footnotes:
> [1]  https://root.cern.ch/cling
> [2]  https://www.youtube.com/watch?v=Lbi7MLS03Yc
> [3]  https://root.cern.ch/
> [4]  https://github.com/brianqq/inferior-cling
>
> --
> Dr. Dindi
> Dad, Philosopher, Hacker
>
>

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