+
+
+def splitFields(cal):
+ '''Takes a list of lines in a calendar file and returns a list of tuples
+ as (key, value) pairs'''
+
+ ical = [tuple(x.split(':',1)) for x in cal]
+
+ # Check that we got 2 items on every line
+ for line in ical:
+ if not len(line) == 2:
+ raise InvalidICS, "Didn't find a content key on: %s"%(line)
+
+ return ical
+
+
+def joinFields(ical):
+ '''Takes a list of tuples that make up a calendar file and returns it to a
+ list of lines'''
+
+ return [':'.join(x) for x in ical]
+
+
+def getContent(url='',stdin=False):
+ '''Generic content retriever, DO NOT use this function in a CGI script as
+ it can read from the local disk (which you probably don't want it to).
+ '''
+
+ encoding = '' # If we don't populate this, the script will assume UTF-8
+
+ # Special case, if this is a HTTP url, return the data from it using
+ # the HTTP functions which attempt to play a bit nicer.
+ parsedURL = urlparse.urlparse(url)
+ if 'http' in parsedURL[0]: return getHTTPContent(url)
+
+ if stdin:
+ content = sys.stdin.read()
+ return (content, encoding)
+
+ if not parsedURL[0]:
+ try: content = open(os.path.abspath(url),'r').read()
+ except (IOError, OSError), e:
+ sys.stderr.write('%s\n'%e)
+ sys.exit(1)
+ return (content, encoding)
+
+ # If we've survived, use python's generic URL opening library to handle it
+ import urllib2
+ try:
+ res = urllib2.urlopen(url)
+ content = res.read()
+ res.close()
+ except (urllib2.URLError, OSError), e:
+ sys.stderr.write('%s\n'%e)
+ sys.exit(1)
+ return (content, encoding)
+
+
+def getHTTPContent(url='',cache='.httplib2-cache'):
+ '''This function attempts to play nice when retrieving content from HTTP
+ services. It's what you should use in a CGI script.'''
+
+ try:
+ import httplib2
+ except ImportError:
+ import urllib2
+
+ if not url: return ''
+
+ encoding = '' # If we don't populate this, the script will assume UTF-8
+
+ if 'httplib2' in sys.modules:
+ try: h = httplib2.Http('.httplib2-cache')
+ except OSError: h = httplib2.Http()
+ else: h = False
+
+ try:
+ if h:
+ req = h.request(url)
+ content = req[1]
+ if 'content-type' in req[0]:
+ for ct in req[0]['content-type'].split(';'):
+ ct = ct.lower()
+ print ct
+ if 'charset' in ct:
+ encoding = ct.split('=')[1]
+ return (content, encoding)
+ except ValueError, e:
+ sys.stderr.write('%s\n'%e)
+ sys.exit(1)
+
+ try:
+ content = urllib2.urlopen(url).read()
+ return (content, encoding)
+ except (urllib2.URLError, OSError), e:
+ sys.stderr.write('%s\n'%e)
+ sys.exit(1)
+
+ return ('', '')
+
+
+def generateRules():
+ '''Attempts to load a series of rules into a list'''
+ try:
+ import parserrules
+ except ImportError:
+ return []
+
+ rules = [getattr(parserrules, rule) for rule in dir(parserrules) if callable(getattr(parserrules, rule))]
+ return rules
+
+
+def applyRules(ical, rules=[], verbose=False):
+ 'Runs a series of rules on the lines in ical and mangles its output'
+
+ for rule in rules:
+ output = []
+ if rule.__doc__ and verbose:
+ print(rule.__doc__)
+ for line in ical:
+ try:
+ out = rule(line[0],line[1])
+ except TypeError, e:
+ output.append(line)
+ print(e)
+ continue
+
+ # Drop lines that are boolean False
+ if not out and not out == None: continue
+
+ # If the rule did something and is a tuple or a list we'll accept it
+ # otherwise, pay no attention to the man behind the curtain
+ try:
+ if tuple(out) == out or list(out) == out and len(out) == 2:
+ output.append(tuple(out))
+ else:
+ output.append(line)
+ except TypeError, e:
+ output.append(line)
+
+ ical = output
+
+ return ical
+
+
+def writeOutput(cal, outfile=''):
+ '''Takes a list of lines and outputs to the specified file'''
+
+ if not cal:
+ sys.stderr.write('Refusing to write out an empty file')
+ sys.exit(0)
+
+ if not outfile:
+ out = sys.stdout
+ else:
+ try:
+ out = open(outfile, 'w')
+ except (IOError, OSError), e:
+ sys.stderr.write('%s\n'%e)
+ sys.exit(1)
+
+ if cal[-1]: cal.append('')
+
+ out.write('\r\n'.join(cal))
+
+ if not out == sys.stdout:
+ out.close()
+
+
+if __name__ == '__main__':
+ from optparse import OptionParser
+ # If the user passed us a 'stdin' argument, we'll go with that,
+ # otherwise we'll try for a url opener
+
+ parser = OptionParser('usage: %prog [options] url')
+ parser.add_option('-s', '--stdin', action='store_true', dest='stdin',
+ default=False, help='Take a calendar from standard input')
+ parser.add_option('-v', '--verbose', action='store_true', dest='verbose',
+ default=False, help='Be verbose when rules are being applied')
+ parser.add_option('-o', '--output', dest='outfile', default='',
+ help='Specify output file (defaults to standard output)')
+ parser.add_option('-m','--encoding', dest='encoding', default='',
+ help='Specify a different character encoding'
+ '(ignored if the remote server also specifies one)')
+
+ (options, args) = parser.parse_args()
+
+ if not args and not options.stdin:
+ parser.print_usage()
+ sys.exit(0)
+ elif not options.stdin:
+ url = args[0]
+ else:
+ url = ''
+
+ (content, encoding) = getContent(url, options.stdin)
+ encoding = encoding or options.encoding or 'utf-8'
+ cal = lineJoiner(content, encoding)
+ ical = applyRules(splitFields(cal), generateRules(), options.verbose)
+ output = lineFolder(joinFields(ical))
+ writeOutput(output, options.outfile)