#!/usr/bin/env python
"""
Convert /notes/index.atom to RSS 1.0
License: GPL 2; share and enjoy!
Author: Sean B. Palmer, inamidst.com
Requires: /usr/bin/xsltproc
"""

import cgitb; cgitb.enable()
import sys, os, urllib, tempfile

def serve(status, body, mime=None, charset=None, raw=None): 
   # @@ doc, and import the status codes if they'll work
   mime = mime or 'text/html'
   charset = charset or 'utf-8'
   sys.stdout.write("Status: %s\r\n" % status)
   sys.stdout.write("Content-Type: %s; charset=%s\r\n\r\n" % (mime, charset))
   if raw: sys.stdout.write(body)
   else: 
      body = str(body)
      if not body.endswith('\n') or body.endswith('\r'): 
         body += '\n'
      sys.stdout.write(body)
   sys.exit()

def mktemp(text=None, pfx=None, sfx=None): 
   if pfx is None: pfx = 'notes-feed'
   if sfx is None: sfx = '.tmp'

   fd, fn = tempfile.mkstemp(prefix=pfx, suffix=sfx)
   if text: 
      f = os.fdopen(fd, 'w')
      f.write(text)
      f.close()
   return fn

def shell(script, scriptname): 
   def command(args): 
      status = os.spawnv(os.P_WAIT, script, [scriptname] + args)
      if status != 0: 
         msg = "%s %s returned %s status"
         raise Exception, msg % (script, args, abs(status))
      return
   return command

xsltproc = shell('/usr/bin/xsltproc', 'xsltproc')

def xslt(xsltfn, xmlfn, outfn): 
   args = ['--novalid', '-o', outfn, xsltfn, xmlfn]
   xsltproc(args)

def getXSLT(xsltfn, xmlfn): 
   outfn = mktemp(pfx='notes-feed', sfx='.rss')
   xslt(xsltfn, xmlfn, outfn)
   f = open(outfn, 'r')
   s = f.read()
   f.close()
   os.unlink(outfn)
   return s

def main(): 
   xsltfn = 'atomToRSS.xsl'
   xmlfn, info = urllib.urlretrieve('http://inamidst.com/notes/index.atom')
   result = getXSLT(xsltfn, xmlfn)
   os.unlink(xmlfn)
   serve(200, result, mime='text/xml')

if __name__=="__main__": 
   main()