#!/usr/local/bin/python 
"""
p4rss.py - generate RSS 2.0 feed
from 10 most recent changes from Perforce.
To run it,
	python p4rss.py > /path/to/rssfile
Other options of p4 changes, -i, -u, -s, etc are not supported.
see sample.p4rss.xml for sample output.
For more information see p4rss.html

RSS 2.0 documentation: http://backend.userland.com/rss
"""
import ConfigParser
import marshal
import os
import re
import string
import sys
import time
from email.Utils import formatdate

# customization code copied from python cookbook 4.11 p135
# begin-customization
# change the values in p4rss.ini
_configDefault = {
  "c.filespec": '//depot/...',
  "c.title": 'Most recent changes in public Perforce depot',
  "c.site_url": 'http://public.perforce.com',
  "c.cgi_url": '/cgi-bin/p4db/changeView.cgi?CH=',
  "c.maxchanges": "10",
  "c.maildomain":''
}
def loadConfig(file, config = {}):
  config = config.copy()
  cp = ConfigParser.ConfigParser()
  cp.read(file)
  for sec in cp.sections():
    name = string.lower(sec)
    for opt in cp.options(sec):
      config[name + "." + string.lower(opt)] = string.strip(cp.get(sec, opt))
  return config

c = loadConfig("p4rss.ini", _configDefault)

# end-of-cusotmization

p4changes = 'p4 -G changes -l -m ' + c['c.maxchanges'] + ' ' + c['c.filespec']
#p4changes = 'p4 -G changes -l -m ' + str(maxchanges) + ' ' + path
stream = os.popen(p4changes, 'rb')

# enttab borrowed from xmllib.py
enttab={'<':'&#60;', '>':'&#62;', '&':'&#38;', '"':'&#34;', '\'': '&#39;'} 
def replaceEntity(match):
  rawEntity=match.group()
  return enttab[rawEntity]
               
def escapeEntities(s):
  ent=re.compile('&|>|<|"'"|'"'')
  return ent.sub(replaceEntity, s)

# print RSS 2.0
print "<?xml version='1.0'?>"
print "<rss version=\"2.0\">"
print "<channel>"
print "\t<title>%s</title>" % c['c.title']
print "\t<link>%s</link>" % c['c.site_url']
print "\t<language>en-US</language>"
print "\t<description>p4 changes -l -m %s %s in RSS 2.0</description>\n" %(c['c.maxchanges'], c['c.filespec']) 
print "\t<pubDate>%s</pubDate>" % formatdate(time.time(), True) #time.asctime()


try:
  while 1:
    dict =  marshal.load(stream)
    print "\t<item>"
    print "\t\t<title>%s</title>" % dict['change']
    print "\t\t<link>%s%s%s</link>" % (c['c.site_url'], c['c.cgi_url'], dict['change'])
    print "\t\t<pubDate>%s</pubDate>" % formatdate(int(dict['time']), True)
    print "\t\t<author>%s</author>" % (dict['user']+c['c.maildomain'])
    print "\t\t<description>%s</description>" % escapeEntities(dict['desc'])
    print "\t</item>"

except EOFError: pass

print "</channel>"
print "</rss>"