PXSL entry parser

"Hiếu Hoàng" <[email protected]> Tue, 1 Jul 2008 00:49:53 +0700

Newsgroups	gmane.comp.web.pyblosxom.devel
Message-ID	<[email protected]>

  Hi all,

  I have written a PXSL entry parser for pyblosxom. You can see some
example posts in <http://hdh.dyn-o-saur.com/blog/entries/>, and the
first PXSL post at <http://hdh.dyn-o-saur.com/plos/pxsl>. The .edf
file in /style is also part of PXSL.

  I think because of the markup-heavy orientation of PXSL, it leaves a
lot of newlines after elements, thus by default outputs HTML that
renders like "PXSL .", note the space. Doing replace(">\n", ">") works
well, but I'm open for suggestions.

  I give the whole entry file for pxslcc to parse. Luckily it treats #
as comment. On the other hand, the title line "Title in fragments" is
parsed into '<Title DEFAULT="in" DEFAULT="fragments"/>'. I just went
the easy way and read the title line seperately when returning entry
data. Is there a better way?

  Related to the last question, do I have to pass metadata lines in
the returned entry data?

  I would like to contribute this script to the contrib section.

  Hiếu

P.S.: hdh.dyn-o-saur.com is not online 24/7, it sleeps when I do :)

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pxsl.py (text/x-python, 2.3 KB)

# coding: utf-8
"""
A PXSL entry parser for PyBlosxom. PXSL is the Parsimonious XML Shorthand
Language (http://community.moertel.com/pxsl/). To use this, you must have pxslcc
installed (Debian name: pxsl-tools).

Installation:
* Copy the file to a plugins directory
* Add 'pxsl' to py['load_plugins']
* Posts with '.pxsl' extension are parsed as PXSL
* Strongly recommended: add py['pxsl_options'] = ['--indent=0'] to collapse
  whitespace between generated XML elements

You can include defaults by defining a list of them in py['pxsl_defaults'], and
macros in py['pxsl_macros']

Tested with pxslcc 0.9.3.

Notes:
* I once installed pxslcc into /usr/local/bin but either the CGI script or the
web server couldn't find it
* The Popen line is rather ugly, but using executable results in empty stdout
* Extracting post title is really messy, opening the entry twice

This file is in the public domain. In case that is not legally possible: I grant
anyone the right to use this work for any purpose, without any conditions,
unless such conditions are required by law.
"""
__version__ = '0.1'
__author__ = 'Hoàng Đức Hiếu <[email protected]>'

def cb_entryparser(args):
    args['pxsl'] = parse
    return args

def parse(filename, request):
    args = []
    config = request.getConfiguration()
    defaults = config.get('pxsl_defaults', None)
    if defaults:
        from itertools import chain, repeat
        args = list(chain(repeat('-a', len(defaults)), defaults))
    args.extend(config.get('pxsl_options', []))
    args.extend(config.get('pxsl_macros', []))
    args.append(filename)
    from subprocess import Popen, PIPE, STDOUT
    pxslcc = Popen(["pxslcc"] + args,
                   stdout=PIPE, stderr=STDOUT
                   )
    out = pxslcc.stdout.read()
    pxslcc.poll()
    if pxslcc.returncode:
        body = "<pre><samp>%s</samp></pre>" % out.replace("<", "&gt;")
    else:
        body = out.partition('\n')[2] # the entry is parsed into <Title DEFAULT="in" DEFAULT="fragments"/>\n<blah blah=...
        body = body.replace(">\n", '>') # those totally ruin spacing, and HTML doesn't have xml:space
    entryData = {'body': body,
                 'title': file(filename).readline() # munging the XML title is a lot more trouble than this
                 }
    return entryData