Re: [Jython-dev] Jython settings - input requested

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Hi Nicholas, 

For my 2 cents worth, I like your suggestions and think they will help
clarify things going forward. I'm wondering if having something like,
for example, 'JythonImports' setting the that could be used to specify
where external libraries are so they can be found when using standalone
Jython or in a web application environment. Something kinda like a
classpath but could also include python modules as well as java. This
might make it easier to have multiple instances of Jython each with a
unique environment as needed by the web app.  However, I'm not sure if
this is doable or what sort of coding it would require.

One other comment instead of just calling it simply 'registry' would
clearer to call it Jython.registry or maybe Jython.settings or even
something like in the java world... Jython.properties

Thanks for your time.
Greg.

-----Original Message-----
From: jyt...@li...
[mailto:jyt...@li...] On Behalf Of Nicholas
Riley
Sent: Thursday, July 31, 2008 12:02 PM
To: jyt...@li...
Cc: jyt...@li...
Subject: [Jython-dev] Jython settings - input requested

Hi folks,

We're trying to clean up the multitude of ways Jython reads settings 
(properties, options) and would appreciate your input on what bits of 
customization you use and which ones you'd like to see added or removed.

Jython reads settings/options/properties at startup from several 
sources.  From the standpoint of a user of the interactive interpreter, 
they are:

- Java system properties (-J-Dxxx=yyy with new launcher script)
- Registry (prop=value in file jython_home/registry or $HOME/.jython)
- Jython properties (-Dxxx=yyy)

There exist several partial attempts at documenting these settings.  
I've attempted to enumerate them all here:

   <http://wiki.python.org/jython/Settings>

Some cases in which I'm pretty sure Jython is not behaving as designed 
or expected:

1. If a registry file is present, the Java system properties are ignored

completely.

2. If both registry files are present, the "registry" one is ignored 
completely.

3. If a property exists in the registry, it takes precedence over a 
command-line option (e.g., python.verbose trumps -v[vv]).

Some changes I'm considering making:

1. Merge system properties and registry files into the registry, rather 
than replacing them outright.

2. Make command-line options take precedence over registry options.

3. Read from the JYTHONPATH environment variable, replacing python.path 
in the registry (or in system properties?).  This is analogous to 
IronPython's IRONPYTHONPATH.

CPython understands a bunch more environment variables (e.g. 
PYTHONDEBUG, PYTHONINSPECT) but I'm not sure we really need to support 
them, either in place or renamed.  Should the JYTHONPATH mapping happen 
in the launcher scripts or Jython itself?

One last thing: in CPython, setting PYTHONPATH places the items after 
the current directory, but before the standard library.  Setting 
python.path in Jython places the items after the standard library; you 
must use python.prepath to get the CPython behavior.

It looks like the reason for this change is no longer applicable:

   <http://www.jython.org/cgi-bin/faqw.py?req=show&file=faq02.003.htp>

as the Python standard library is now included with Jython by default, 
so perhaps python.prepath should be removed and python.path take its 
place?  Or do we need a python.postpath?  Does anyone take advantage of 
this ordering?
-- 
Nicholas Riley <nj...@ui...>

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