Re: How-to evaluate Java-snippets in org-mode/org-babel?

[Torsten Wagner <torsten.wagner@gmail.com>]

Hi Eric,

Somehow I was pretty sure you would answer ;)

I tried your example and it work great so far.

I have three points which I would like to discuss

1. I thought it might be nice to declare the package and class name for 
the java-stuff as variable in a property node then I could do something 
like:

* Coursework 1
:PROPERTIES:
:var: PKGNAME="cw1"
:var: CLASS="calc"
:END:

** Snippet 1
** Snippet 2

* Coursework 2
:PROPERTIES:
:var: PKGNAME="cw2"
:var: CLASS="string"
:END:

** Snippet 1
** Snippet 2

Unfortunately, org-mode does not allow multiple definition of the same 
property. I know there is a work around with a table. However, I thought 
I could use simply a list.

:var: vars="(cw1 calc)"
and use this in my shell script. However, this doesn't work. I can't 
index them. Any idea? Should it work in principle? Could I e.g., use
:var: vars="{'x': 128, 'y': 210}"
and put this in a python block accessing them by vars['x'] and 
vars['y']? That would be great!


2. I'm not totally sure but it seems that tangling creates the desired 
file if it is not existing so fare but it does not create folders thus,
:tangle path/filename seems not to work.
Any reason for this or maybe good idea to add it as a feature?
For now, I added a little shell-based block "start" which takes care of 
this.

3. Tangleing and executing the code via a shell blocks works great. I 
saw somewhere that you could even tangle from the command line by 
calling emacs in batch mode. That's maybe a bit overcomplex for my task 
but some additional style to noweb might be nice. Instead of placing the 
code block at the point of call, tangle the code block. Then I could call

<<start>>
<<snippet>>
<<execute>>

If I understood right, noweb for now only place the code of the block at 
the particular place. Maybe, I could write a lisp-block "tangle" which 
tangles the code and call it via
<<tangle(snippet)>>
Just want to know if this might be a good idea in general or if this 
works already in some other way.

All the best

Totti