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	#! /usr/bin/env python

	import sys, os, time
	import logging, signal
	from optparse import OptionParser, OptionGroup


	## Make "sorted" a builtin function on Python < 2.4
	if 'sorted' not in dir(__builtins__):
	def sorted(iterable, cmp=None, key=None, reverse=None):
	rtn = iterable
	rtn.sort(cmp)
	return rtn

	## Add logging.log if needed
	if 'log' not in dir(logging):
	def _logit(level, msg):
	l = logging.getLogger()
	l.log(level, msg)
	logging.log = _logit


	## Change dlopen status to GLOBAL for Rivet lib
	try:
	import ctypes
	sys.setdlopenflags(sys.getdlopenflags() \| ctypes.RTLD_GLOBAL)
	except:
	import dl
	sys.setdlopenflags(sys.getdlopenflags() \| dl.RTLD_GLOBAL)

	## Try to rename the process on Linux
	try:
	import ctypes
	libc = ctypes.cdll.LoadLibrary('libc.so.6')
	libc.prctl(15, 'rivet', 0, 0, 0)
	except Exception:
	pass

	## Try to use Psyco optimiser
	try:
	import psyco
	psyco.full()
	except ImportError:
	pass


	## Get version from rivet-config
	version = "HEAD"
	try:
	version = commands.getoutput("rivet-config --version")
	except:
	pass


	## Description / usage message
	usage="""Run Rivet analyses on inputted events from file or Unix pipe

	Examples:
	%prog [options] <hepmcfile>
	my_generator -o myfifo & \ %prog [options] myfifo
	agile-runmc <genname> -n 100k \| %prog [options]

	ENVIRONMENT:
	* RIVET_ANALYSIS_PATH: list of paths to be searched for plugin
	analysis libraries at runtime
	* RIVET_REF_PATH: list of paths to be searched for reference
	data files
	* RIVET_INFO_PATH: list of paths to be searched for analysis
	metadata files
	"""


	PROGPATH = sys.argv[0]
	PROGNAME = os.path.basename(PROGPATH)

	## Try to bootstrap the Python path
	import commands
	try:
	modname = sys.modules[__name__].__file__
	binpath = os.path.dirname(modname)
	rivetconfigpath = os.path.join(binpath, "rivet-config")
	rivetpypath = commands.getoutput(rivetconfigpath + " --pythonpath")
	sys.path.append(rivetpypath)
	except:
	pass


	## Parse command line options
	parser = OptionParser(usage=usage, version="rivet v%s" % version)
	parser.add_option("-n", "--nevts", dest="MAXEVTNUM", type="int",
	default=None, metavar="NUM",
	help="max number of events to read.")
	parser.add_option("-a", "--analysis", dest="ANALYSES", action="append",
	default=[], metavar="ANA",
	help="add an analysis to the processing list.")
	parser.add_option("-A", "--all-analyses", dest="ALL_ANALYSES", action="store_true",
	default=False, help="add all analyses to the processing list.")
	parser.add_option("--list-analyses", dest="LIST_ANALYSES", action="store_true",
	default=False, help="show the list of available analyses' names. With -V, it shows the descriptions, too")
	parser.add_option("--list-used-analyses", action="store_true", dest="LIST_USED_ANALYSES",
	default=False, help="list the analyses used by this command (after subtraction of inappropriate ones)")
	parser.add_option("--show-analysis", dest="SHOW_ANALYSES", action="append",
	default=[], help="show the details of an analysis")
	parser.add_option("--runname", dest="RUN_NAME", default=None, metavar="NAME",
	help="give an optional run name, to be prepended as a 'top level directory' in histo paths")
	parser.add_option("-H", "--histo-file", dest="HISTOFILE",
	default="Rivet", help="specify the output histo file path")
	parser.add_option("-x", "--cross-section", dest="CROSS_SECTION",
	default=None, metavar="XS",
	help="specify the signal process cross-section in pb")

	verbgroup = OptionGroup(parser, "Verbosity control")
	parser.add_option("-l", dest="NATIVE_LOG_STRS", action="append",
	default=[], help="set a log level in the Rivet library")
	verbgroup.add_option("-V", "--verbose", action="store_const", const=logging.DEBUG, dest="LOGLEVEL",
	default=logging.INFO, help="print debug (very verbose) messages")
	verbgroup.add_option("-Q", "--quiet", action="store_const", const=logging.WARNING, dest="LOGLEVEL",
	default=logging.INFO, help="be very quiet")
	parser.add_option_group(verbgroup)
	opts, args = parser.parse_args()


	## Configure logging
	try:
	logging.basicConfig(level=opts.LOGLEVEL, format="%(message)s")
	except:
	pass
	h = logging.StreamHandler()
	h.setFormatter(logging.Formatter("%(message)s"))
	logging.getLogger().setLevel(opts.LOGLEVEL)
	if logging.getLogger().handlers:
	logging.getLogger().handlers[0] = h
	else:
	logging.getLogger().addHandler(h)


	## Try importing rivet
	try:
	import rivet
	except Exception, e:
	sys.stderr.write(PROGNAME + " requires the 'rivet' Python module\n");
	logging.debug(str(e))
	sys.exit(1)


	## Control native Rivet library logger
	for l in opts.NATIVE_LOG_STRS:
	name, level = None, None
	try:
	name, level = l.split("=")
	except:
	name = "Rivet"
	level = l
	## Fix name
	if name != "Rivet" and not name.startswith("Rivet."):
	name = "Rivet." + name
	try:
	## Get right error type
	LEVEL = level.upper()
	if LEVEL == "TRACE":
	level = rivet.Log.TRACE
	elif LEVEL == "DEBUG":
	level = rivet.Log.DEBUG
	elif LEVEL == "INFO":
	level = rivet.Log.INFO
	elif LEVEL == "WARNING" or LEVEL == "WARN":
	level = rivet.Log.WARN
	elif LEVEL == "ERROR":
	level = rivet.Log.ERROR
	else:
	level = int(level)
	logging.debug("Setting log level: %s %d" % (name, level))
	rivet.Log.setLogLevel(name, level)
	except:
	logging.warning("Couldn't process logging string '%s'" % l)


	## Parse supplied cross-section
	if opts.CROSS_SECTION is not None:
	xsstr = opts.CROSS_SECTION
	try:
	opts.CROSS_SECTION = float(xsstr)
	except:
	import re
	suffmatch = re.search(r"[^\d.]", xsstr)
	if not suffmatch:
	raise ValueError("Bad cross-section string: %s" % xsstr)
	factor = base = None
	suffstart = suffmatch.start()
	if suffstart != -1:
	base = xsstr[:suffstart]
	suffix = xsstr[suffstart:].lower()
	if suffix == "mb":
	factor = 1e+9
	elif suffix == "mub":
	factor = 1e+6
	elif suffix == "nb":
	factor = 1e+3
	elif suffix == "pb":
	factor = 1
	elif suffix == "fb":
	factor = 1e-3
	elif suffix == "ab":
	factor = 1e-6
	if factor is None or base is None:
	raise ValueError("Bad cross-section string: %s" % xsstr)
	xs = float(base) * factor
	opts.CROSS_SECTION = xs


	## Print the available CLI options!
	#if opts.LIST_OPTIONS:
	# for o in parser.option_list:
	# print o.get_opt_string()
	# sys.exit(0)


	## Set up signal handling
	RECVD_KILL_SIGNAL = None
	def handleKillSignal(signum, frame):
	"Declare us as having been signalled, and return to default handling behaviour"
	global RECVD_KILL_SIGNAL
	logging.critical("Signal handler called with signal " + str(signum))
	RECVD_KILL_SIGNAL = signum
	signal.signal(signum, signal.SIG_DFL)
	## Signals to handle
	signal.signal(signal.SIGTERM, handleKillSignal);
	signal.signal(signal.SIGHUP, handleKillSignal);
	signal.signal(signal.SIGINT, handleKillSignal);
	signal.signal(signal.SIGUSR1, handleKillSignal);
	signal.signal(signal.SIGUSR2, handleKillSignal);
	try:
	signal.signal(signal.SIGXCPU, handleKillSignal);
	except:
	pass


	## List of analyses
	all_analyses = rivet.AnalysisLoader.analysisNames()
	if opts.LIST_ANALYSES:
	## Treat args as case-insensitive regexes if present
	regexes = None
	if args:
	import re
	regexes = [re.compile(arg, re.I) for arg in args]
	for aname in all_analyses:
	if not regexes:
	toshow = True
	else:
	toshow = False
	for regex in regexes:
	if regex.search(aname):
	toshow = True
	break
	if toshow:
	msg = aname
	if opts.LOGLEVEL == logging.DEBUG:
	a = rivet.AnalysisLoader.getAnalysis(aname)
	msg = "%-25s %s" % (aname, " " + a.summary())
	print msg
	sys.exit(0)


	## Show analyses' details
	if len(opts.SHOW_ANALYSES) > 0:
	toshow = []
	for i, a in enumerate(opts.SHOW_ANALYSES):
	a_up = a.upper()
	if a_up in all_analyses and a_up not in toshow:
	toshow.append(a_up)
	else:
	## Treat as a case-insensitive regex
	import re
	regex = re.compile(a, re.I)
	for ana in all_analyses:
	if regex.search(ana) and a_up not in toshow:
	toshow.append(ana)

	## Show the matching analyses' details
	import textwrap
	for i, name in enumerate(sorted(toshow)):
	ana = rivet.AnalysisLoader.getAnalysis(name)
	print ""
	print name
	print len(name) * "="
	print ""
	print ana.summary()
	print ""
	print "Status: %s" % ana.status()
	print ""
	print "Spires ID: %s" % ana.spiresId()
	print "Spires URL: http://www.slac.stanford.edu/spires/find/hep/www?rawcmd=key+%s" % ana.spiresId()
	print "HepData URL: http://hepdata.cedar.ac.uk/view/irn%s" % ana.spiresId()
	print "Experiment: %s" % ana.experiment(), ana.collider()
	print "Year of publication: %s" % ana.year()
	print "Authors:"
	for a in ana.authors():
	print " " + a
	print ""
	print "Description:"
	twrap = textwrap.TextWrapper(width=75, initial_indent=2" ", subsequent_indent=2" ")
	print twrap.fill(ana.description())
	print ""
	print "Run details:"
	twrap = textwrap.TextWrapper(width=75, initial_indent=2" ", subsequent_indent=4" ")
	for l in ana.runInfo().split("\n"):
	print twrap.fill(l)
	if ana.references():
	print ""
	print "References:"
	for r in ana.references():
	url = None
	if r.startswith("arXiv:"):
	code = r.split()[0].replace("arXiv:", "")
	url = "http://arxiv.org/abs/" + code
	elif r.startswith("doi:"):
	code = r.replace("doi:", "")
	url = "http://dx.doi.org/" + code
	if url is not None:
	r += " - " + url
	print " %s" % r

	if i+1 < len(toshow):
	print "\n"
	sys.exit(0)


	## Identify HepMC files/streams
	## TODO: check readability, deal with stdin
	if len(args) > 0:
	HEPMCFILES = args
	else:
	HEPMCFILES = ["-"]


	## Event number logging
	def logNEvt(n, starttime, maxevtnum):
	nevtloglevel = logging.DEBUG
	if n % 10 == 0:
	nevtloglevel = logging.DEBUG + 5
	if n % 100 == 0:
	nevtloglevel = logging.INFO
	if n % 200 == 0:
	nevtloglevel = logging.INFO + 5
	if n % 500 == 0:
	nevtloglevel = logging.WARNING
	if n % 1000 == 0:
	nevtloglevel = logging.WARNING + 5
	if n % 10000 == 0:
	nevtloglevel = logging.CRITICAL
	timecurrent = time.time()
	timeelapsed = timecurrent - starttime;
	if maxevtnum is None:
	logging.log(nevtloglevel, "Event %d (%d s elapsed)" % (n, timeelapsed))
	else:
	timeleft = (maxevtnum-n)*timeelapsed/n
	eta = time.strftime("%a %b %d %H:%M", time.localtime(timecurrent + timeleft))
	logging.log(nevtloglevel, "Event %d (%d s elapsed / %d s left) -> ETA: %s"
	% (n, timeelapsed, timeleft, eta))


	## Set up analysis handler
	RUNNAME = opts.RUN_NAME or ""
	ah = rivet.AnalysisHandler(opts.HISTOFILE, RUNNAME)
	if opts.ALL_ANALYSES:
	opts.ANALYSES = all_analyses
	for a in opts.ANALYSES:
	a_up = a.upper()
	## Print warning message and exit if not a valid analysis name
	if not a_up in all_analyses:
	print "'%s' is not a valid analysis. Available analyses are:" % a_up
	for aa in all_analyses:
	print " %s" % aa
	sys.exit(1)
	logging.debug("Adding analysis '%s'" % a_up)
	ah.addAnalysis(a_up)

	## Read and process events
	run = rivet.Run(ah)
	if opts.CROSS_SECTION is not None:
	logging.info("User-supplied cross-section = %e pb" % opts.CROSS_SECTION)
	run.setCrossSection(opts.CROSS_SECTION)
	if opts.LIST_USED_ANALYSES is not None:
	run.setListAnalyses(opts.LIST_USED_ANALYSES)

	## Print platform type
	import platform
	logging.info("Rivet running on machine %s (%s)" % (platform.node(), platform.machine()))

	## Init run based on one event
	evtfile = HEPMCFILES[0]
	if not run.init(evtfile):
	logging.error("Failed to initialise on event file %s" % evtfile)
	sys.exit(2)

	## Event loop
	starttime = time.time()
	EVTNUM = 0
	for fileidx in range(len(HEPMCFILES)):
	logging.info("Reading events from '%s'" % HEPMCFILES[fileidx])
	while opts.MAXEVTNUM is None or EVTNUM < opts.MAXEVTNUM:
	EVTNUM += 1
	logNEvt(EVTNUM, starttime, opts.MAXEVTNUM)
	if not run.processEvent():
	logging.warn("Event processing failed for evt #%i!" % (EVTNUM))
	break
	if RECVD_KILL_SIGNAL is not None:
	break
	if not run.readEvent():
	break
	if fileidx<len(HEPMCFILES)-1:
	run.openFile(HEPMCFILES[fileidx+1])
	if not run.readEvent():
	continue
	logging.info("Finished event loop")
	run.finalize()

	## Finalize and write out data file
	ah.finalize()
	ah.commitData();

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