Help needed with writing a plugin for rss2 (a bit long)

Hi all,

I would like to write a plugin for pyblosxom, both as a learning
experience,
but also out of a desire to get proper rss2.0 handling in pyblosxom via
?flav=rss2 or index.rss2.

I've looked through the wiki and looked around in the code of pybloxom,
but I'm not quite sure how to proceed. This will be a learning
experience 
for me - I'm aiming to document the process thoroughly perhaps allowing
my effort to be kind of a plugin writing HOWTO.

I'll try to explain what I want to do and what my questions are
in the following.

---------
Overview:

The plugin needs to subsitute certain template variables when
a call to the appropriate flavour (rss2) is made. A default
set of rss2 templates will be supplied with the plugin.

----------
Questions:
 
When is the plugin called during the process?
- This is still unclear to me.

How do I make the plugin react only to ?flav=rss2?
- Does it need to hook into something in order to do this?

How do I make the plugin actually replace the template vars?
- This part is opague to me.

When the template substitution is complete, do I need to do
something particular or does pyblosxom take care of the rest
wrt output?
	
How do I copy template variables out of config.py?
- I'll use them to populate the rss_xxx variables documented below.

Template variables (the py['xxx'] stuff needs to be copied from
config.py):

# What's this blog's title?
rss_title = py['blog_title']

# What's this blog's author name and email?
rss_author = py['blog_author']

# What's this blog's description (for outgoing RSS feed)?
rss_description = py['blog_description']

# What's this blog's primary language (for outgoing RSS feed)?
rss_lang = py['blog_language']

rss_link:
 link to the uri for the blog.

rss_lastbuilddate:
 returns string w/date of the newest post.

rss_length_item_desc:
 whole, positive number describing how many characters of each entry to
include in
 the feed. The default value is 0.

rss_item_desc:
 template variable which is exchanged with the first
rss_length_item_desc characters
 of each entry.

rss_generator:
 returns the version number of pyblosxom along with the plugin version.

rss_ttl:
 Whole, positive number. How long the feed can be cached
(in minutes) before an update is retried (for aggregator use). Defaults
to 60.

# -- end 

I hope someone will be able to give me some advice.

Kind regards,

	rune



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