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From: Martin Alsinet <martin@alsinet.com.ar>
To: stardiviner <numbchild@gmail.com>
Cc: emacs-orgmode <emacs-orgmode@gnu.org>
Subject: Re: Hope ob-js can support :session feature
Date: Fri, 22 Dec 2017 18:32:07 +0000	[thread overview]
Message-ID: <CABUJmkDEC3MYrE6mDtB1xPXYHPggfoNnCsOfmZvgemZpoj5reA@mail.gmail.com> (raw)
In-Reply-To: <0a1fd382-6c99-e69d-c998-b3157edab040@gmail.com>

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Hello stardiviner,

On Fri, Dec 22, 2017 at 6:57 AM stardiviner <numbchild@gmail.com> wrote:

>
> I wish to do JavaScript Literate Programming in Org-mode.
>
> So the :session header argument is very necessary.
>
>
I do Literate Programming in Javascript with Org-mode, and I have found a
workaround using a combination of tangled files and require.

I separate the logic in source code blocks which then I tangle into js
files and I require those js files in other source blocks.

Example:

#+BEGIN_SRC js :tangle src/parser.js
const fs = require('fs');
const parse = require('csv-parse')

function columns(line){
    return line.map(s => s.toLowerCase());
}
parse_csv = function(filename, fn, limit){
    fs.readFile(filename, "utf8", function (err, fileData) {
        var opts = {columns: columns, trim: true};
        if (limit) {
            opts.to = limit;
        }
        parse(fileData, opts, (err, rows) => fn(rows));
    });
}
module.exports = parse_csv;
#+END_SRC

So, I tangle that source block into a js file, and then I can use it from
other blocks, without needing sessions at all:

#+BEGIN_SRC
const parser = require("/app/src/parser.js");
const inputFile = './data/records.csv';
parse_csv(inputFile, console.log);
#+END_SRC

The only drawback is that you have to use absolute paths requiring the js
files, but since I am using docker containers to run node, I always mount
the current directory as a volume in /app inside the container, so that
works out fine.
I also think that this way forces me to separate the code in modular
blocks, which is already a good practice in itself.
With sessions you have to make sure to execute the blocks in the correct
order to build the "state" that your current block needs.
This way source blocks function as standalone units that can be run at any
time, I just run *org-babel-tangle* and then hit *C-c *inside the js block.

I hope that helps you.


Martin

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next prev parent reply	other threads:[~2017-12-22 18:32 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-12-22 11:57 Hope ob-js can support :session feature stardiviner
2017-12-22 18:32 ` Martin Alsinet [this message]
2017-12-23  1:07   ` numbchild
2017-12-23  3:06     ` Martin Alsinet
2017-12-24  3:13       ` numbchild
2017-12-24 16:15         ` Martin Alsinet

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