#!/usr/bin/python

#---------- setup ----------

import signal
signal.signal(signal.SIGINT, signal.SIG_DFL)

import os
import time
import urllib
import urllib2
import errno
import sys
import re as regexp
import random
import curses
from optparse import OptionParser

from BeautifulSoup import BeautifulSoup

opts = None

#---------- YPP parameters and arrays ----------

puzzles = ('Swordfighting/Bilging/Sailing/Rigging/Navigating'+
	'/Battle Navigation/Gunning/Carpentry/Rumble/Treasure Haul'+
	'/Drinking/Spades/Hearts/Treasure Drop/Poker/Distilling'+
	'/Alchemistry/Shipwrightery/Blacksmithing/Foraging').split('/')

standingvals = ('Able/Distinguished/Respected/Master'+
		'/Renowned/Grand-Master/Legendary/Ultimate').split('/')

pirate_ref_re = regexp.compile('^/yoweb/pirate\\.wm')

max_pirate_namelen = 12


#---------- general utilities ----------

def debug(m):
	if opts.debug > 0:
		print m

def format_time_interval(ti):
	if ti < 120: return '%d:%02d' % (ti / 60, ti % 60)
	if ti < 7200: return '%2dm' % (ti / 60)
	if ti < 86400: return '%dh' % (ti / 3600)
	return '%dd' % (ti / 86400)

#---------- caching and rate-limiting data fetcher ----------

class Fetcher:
	def __init__(self, ocean, cachedir):
		debug('Fetcher init %s' % cachedir)
		self.ocean = ocean
		self.cachedir = cachedir
		try: os.mkdir(cachedir)
		except (OSError,IOError), oe:
			if oe.errno != errno.EEXIST: raise
		self._cache_scan(time.time())

	def default_ocean(self, ocean='ice'):
		if self.ocean is None:
			self.ocean = ocean

	def _cache_scan(self, now):
		# returns list of ages, unsorted
		ages = []
		debug('Fetcher   scan_cache')
		for leaf in os.listdir(self.cachedir):
			if not leaf.startswith('#'): continue
			path = self.cachedir + '/' + leaf
			try: s = os.stat(path)
			except (OSError,IOError), oe:
				if oe.errno != errno.ENOENT: raise
				continue
			age = now - s.st_mtime
			if age > opts.expire_age:
				debug('Fetcher    expire %d %s' % (age, path))
				try: os.remove(path)
				except (OSError,IOError), oe:
					if oe.errno != errno.ENOENT: raise
				continue
			ages.append(age)
		return ages

	def need_wait(self, now):
		ages = self._cache_scan(now)
		ages.sort()
		debug('Fetcher   ages ' + `ages`)
		min_age = 1
		need_wait = 0
		for age in ages:
			if age < min_age and age < 300:
				debug('Fetcher   morewait min=%d age=%d' %
					(min_age, age))
				need_wait = max(need_wait, min_age - age)
			min_age += 3
			min_age *= 1.25
		return need_wait

	def _rate_limit_cache_clean(self, now):
		need_wait = self.need_wait(now)
		if need_wait > 0:
			debug('Fetcher   wait %d' % need_wait)
			time.sleep(need_wait)

	def fetch(self, url, max_age):
		debug('Fetcher fetch %s' % url)
		cache_corename = urllib.quote_plus(url)
		cache_item = "%s/#%s#" % (self.cachedir, cache_corename)
		try: f = file(cache_item, 'r')
		except (OSError,IOError), oe:
			if oe.errno != errno.ENOENT: raise
			f = None
		now = time.time()
		max_age = max(opts.min_max_age, min(max_age, opts.expire_age))
		if f is not None:
			s = os.fstat(f.fileno())
			age = now - s.st_mtime
			if age > max_age:
				debug('Fetcher  stale %d < %d'% (max_age, age))
				f = None
		if f is not None:
			data = f.read()
			f.close()
			debug('Fetcher  cached %d > %d' % (max_age, age))
			return data

		debug('Fetcher  fetch')
		self._rate_limit_cache_clean(now)

		stream = urllib2.urlopen(url)
		data = stream.read()
		cache_tmp = "%s/#%s~%d#" % (
			self.cachedir, cache_corename, os.getpid())
		f = file(cache_tmp, 'w')
		f.write(data)
		f.close()
		os.rename(cache_tmp, cache_item)
		debug('Fetcher  stored')
		return data

	def yoweb(self, kind, tail, max_age):
		self.default_ocean()
		url = 'http://%s.puzzlepirates.com/yoweb/%s%s' % (
			self.ocean, kind, tail)
		return self.fetch(url, max_age)

#---------- logging assistance for troubled screenscrapers ----------

class SoupLog:
	def __init__(self):
		self.msgs = [ ]
	def msg(self, m):
		self.msgs.append(m)
	def soupm(self, obj, m):
		self.msg(m + '; in ' + `obj`)
	def needs_msgs(self, child_souplog):
		self.msgs += child_souplog.msgs
		child_souplog.msgs = [ ]

def soup_text(obj):
	str = ''.join(obj.findAll(text=True))
	return str.strip()

class SomethingSoupInfo(SoupLog):
	def __init__(self, kind, tail, max_age):
		SoupLog.__init__(self)
		html = fetcher.yoweb(kind, tail, max_age)
		self._soup = BeautifulSoup(html,
			convertEntities=BeautifulSoup.HTML_ENTITIES
			)

#---------- scraper for pirate pages ----------

class PirateInfo(SomethingSoupInfo):
	# Public data members:
	#  pi.standings = { 'Treasure Haul': 'Able' ... }
	#  pi.name = name
	#  pi.crew = (id, name)
	#  pi.flag = (id, name)
	#  pi.msgs = [ 'message describing problem with scrape' ]
		
	def __init__(self, pirate, max_age=300):
		SomethingSoupInfo.__init__(self,
			'pirate.wm?target=', pirate, max_age)
		self.name = pirate
		self._find_standings()
		self.crew = self._find_crewflag('crew',
			'^/yoweb/crew/info\\.wm')
		self.flag = self._find_crewflag('flag',
			'^/yoweb/flag/info\\.wm')

	def _find_standings(self):
		imgs = self._soup.findAll('img',
			src=regexp.compile('/yoweb/images/stat.*'))
		re = regexp.compile(
u'\\s*\\S*/([-A-Za-z]+)\\s*$|\\s*\\S*/\\S*\\s*\\(ocean\\-wide(?:\\s|\\xa0)+([-A-Za-z]+)\\)\\s*$'
			)
		standings = { }

		for skill in puzzles:
			standings[skill] = [ ]

		skl = SoupLog()

		for img in imgs:
			try: puzzle = img['alt']
			except KeyError: continue

			if not puzzle in puzzles:
				skl.soupm(img, 'unknown puzzle: "%s"' % puzzle)
				continue
			key = img.findParent('td')
			if key is None:
				skl.soupm(img, 'puzzle at root! "%s"' % puzzle)
				continue
			valelem = key.findNextSibling('td')
			if valelem is None:
				skl.soupm(key, 'puzzle missing sibling "%s"'
					% puzzle)
				continue
			valstr = soup_text(valelem)
			match = re.match(valstr)
			if match is None:
				skl.soupm(key, ('puzzle "%s" unparseable'+
					' standing "%s"') % (puzzle, valstr))
				continue
			standing = match.group(match.lastindex)
			standings[puzzle].append(standing)

		self.standings = { }

		for puzzle in puzzles:
			sl = standings[puzzle]
			if len(sl) > 1:
				skl.msg('puzzle "%s" multiple standings %s' %
						(puzzle, `sl`))
				continue
			if not sl:
				skl.msg('puzzle "%s" no standing found' % puzzle)
				continue
			standing = sl[0]
			for i in range(0, len(standingvals)-1):
				if standing == standingvals[i]:
					self.standings[puzzle] = i
			if not puzzle in self.standings:
				skl.msg('puzzle "%s" unknown standing "%s"' %
					(puzzle, standing))

		all_standings_ok = True
		for puzzle in puzzles:
			if not puzzle in self.standings:
				self.needs_msgs(skl)

	def _find_crewflag(self, cf, yoweb_re):
		things = self._soup.findAll('a', href=regexp.compile(yoweb_re))
		if len(things) != 1:
			self.msg('zero or several %s id references found' % cf)
			return None
		thing = things[0]
		id_re = '\\b%sid\\=(\\w+)$' % cf
		id_haystack = thing['href']
		match = regexp.compile(id_re).search(id_haystack)
		if match is None:
			self.soupm(thing, ('incomprehensible %s id ref'+
				' (%s in %s)') % (cf, id_re, id_haystack))
			return None
		name = soup_text(thing)
		return (match.group(1), name)

	def __str__(self):
		return `(self.crew, self.flag, self.standings, self.msgs)`

#---------- scraper for crew pages ----------

class CrewInfo(SomethingSoupInfo):
	# Public data members:
	#  ci.crew = [ ('Captain',        ['Pirate', ...]),
	#	       ('Senior Officer', [...]),
	#		... ]
	#  pi.msgs = [ 'message describing problem with scrape' ]

	def __init__(self, crewid, max_age=300):
		SomethingSoupInfo.__init__(self,
			'crew/info.wm?crewid=', crewid, max_age)
		self._find_crew()

	def _find_crew(self):
		self.crew = []
		capts = self._soup.findAll('img',
			src='/yoweb/images/crew-captain.png')
		if len(capts) != 1:
			self.msg('crew members: no. of captain images != 1')
			return
		tbl = capts[0]
		while not tbl.find('a', href=pirate_ref_re):
			tbl = tbl.findParent('table')
			if not tbl:
				self.msg('crew members: cannot find table')
				return
		current_rank_crew = None
		crew_rank_re = regexp.compile('/yoweb/images/crew')
		for row in tbl.contents:
			# findAll(recurse=False)
			if isinstance(row,basestring):
				continue

			is_rank = row.find('img', attrs={'src': crew_rank_re})
			if is_rank:
				rank = soup_text(row)
				current_rank_crew = []
				self.crew.append((rank, current_rank_crew))
				continue
			for cell in row.findAll('a', href=pirate_ref_re):
				if current_rank_crew is None:
					self.soupm(cell, 'crew members: crew'
						' before rank')
					continue
				current_rank_crew.append(soup_text(cell))

	def __str__(self):
		return `(self.crew, self.msgs)`

#---------- pretty-printer for tables of pirate puzzle standings ----------

class StandingsTable:
	def __init__(self, use_puzzles=None, col_width=6):
		if use_puzzles is None:
			if opts.ship_duty:
				use_puzzles=[
					'Navigating','Battle Navigation',
					'Gunning',
					['Sailing','Rigging'],
					'Bilging',
					'Carpentry',
					'Treasure Haul'
				]
			else:
				use_puzzles=puzzles
		self._puzzles = use_puzzles
		self.s = ''
		self._cw = col_width-1

	def _pline(self, pirate, puzstrs, extra):
		self.s += ' %-*s' % (max(max_pirate_namelen, 14), pirate)
		for v in puzstrs:
			self.s += ' %-*.*s' % (self._cw,self._cw, v)
		if extra:
			self.s += ' ' + extra
		self.s += '\n'

	def _puzstr(self, pi, puzzle):
		if not isinstance(puzzle,list): puzzle = [puzzle]
		try: standing = max([pi.standings[p] for p in puzzle])
		except KeyError: return '?'
		if not standing: return ''
		s = ''
		if self._cw > 4:
			c1 = standingvals[standing][0]
			if standing < 3: c1 = c1.lower() # 3 = Master
			s += `standing`
		if self._cw > 5:
			s += ' '
		s += '*' * (standing / 2)
		s += '+' * (standing % 2)
		return s

	def headings(self):
		def puzn_redact(name):
			if isinstance(name,list):
				return '/'.join(
					["%.*s" % (self._cw/2, puzn_redact(n))
					 for n in name])
			spc = name.find(' ')
			if spc < 0: return name
			return name[0:min(4,spc)] + name[spc+1:]
		self._pline('', map(puzn_redact, self._puzzles), None)
	def literalline(self, line):
		self.s += line + '\n'
	def pirate_dummy(self, name, standingstring, extra=None):
		self._pline(name, standingstring * len(self._puzzles), extra)
	def pirate(self, pi, extra=None):
		puzstrs = [self._puzstr(pi,puz) for puz in self._puzzles]
		self._pline(pi.name, puzstrs, extra)

	def results(self):
		return self.s

#---------- chat log parser ----------

class PirateAboard:
	# This is essentially a transparent, dumb, data class.
	#  pa.v
	#  pa.name
	#  pa.last_time
	#  pa.last_event
	#  pa.gunner
	#  pa.last_chat_time
	#  pa.last_chat_chan
	#  pa.pi

	def __init__(pa, pn, v, time, event):
		pa.name = pn
		pa.v = v
		pa.last_time = time
		pa.last_event = event
		pa.last_chat_time = None
		pa.last_chat_chan = None
		pa.gunner = False
		pa.pi = None

	def pirate_info(pa):
		if not pa.pi and not fetcher.need_wait(time.time()):
			pa.pi = PirateInfo(pa.name, 3600)
		return pa.pi

class ChatLogTracker:
	# This is quite complex so we make it opaque.  Use the
	# official invokers, accessors etc.

	def __init__(self, myself_pi, logfn):
		self._pl = {}	# self._pl['Pirate'] =
		self._vl = {}	#   self._vl['Vessel']['Pirate'] = PirateAboard
				# self._vl['Vessel']['#lastaboard']
		self._v = None		# self._v =
		self._vessel = None	#	self._vl[self._vessel]
		self._date = None
		self._myself = myself_pi
		self._need_redisplay = False
		self._f	= file(logfn)
		self._lbuf = ''
		self._progress = [0, os.fstat(self._f.fileno()).st_size]

	def force_redisplay(self):
		self._need_redisplay = True

	def _onboard_event(self,timestamp,pirate,event):
		try: pa = self._pl[pirate]
		except KeyError: pa = None
		if pa is not None and pa.v is self._v:
			pa.last_time = timestamp
			pa.last_event = event
		else:
			if pa is not None: del pa.v[pirate]
			pa = PirateAboard(pirate, self._v, timestamp, event)
			self._pl[pirate] = pa
			self._v[pirate] = pa
		self._v['#lastaboard'] = timestamp
		self.force_redisplay()
		return pa

	def _trash_vessel(self, v):
		for pn in v:
			if pn.startswith('#'): continue
			del self._pl[pn]
		self.force_redisplay()

	def expire_garbage(self, timestamp):
		for (vn,v) in list(self._vl.iteritems()):
			la = v['#lastaboard']
			if timestamp - la > opts.ship_reboard_clearout:
				self._debug_line_disposition(timestamp,'',
					'stale reset '+vn)
				self._trash_vessel(v)
				del self._vl[vn]

	def clear_vessel(self, timestamp):
		if self._v is not None:
			self._trash_vessel(self._v)
		self._v = {'#lastaboard': timestamp}
		self._vl[self._vessel] = self._v

	def _debug_line_disposition(self,timestamp,l,m):
		debug('CLT %13s %-30s %s' % (timestamp,m,l))

	def chatline(self,l):
		rm = lambda re: regexp.match(re,l)
		d = lambda m: self._debug_line_disposition(timestamp,l,m)
		timestamp = None

		m = rm('=+ (\\d+)/(\\d+)/(\\d+) =+$')
		if m:
			self._date = [int(x) for x in m.groups()]
			self._previous_timestamp = None
			return d('date '+`self._date`)

		if self._date is None:
			return d('date unset')

		m = rm('\\[(\d\d):(\d\d):(\d\d)\\] ')
		if not m:
			return d('no timestamp')

		while True:
			time_tuple = (self._date +
				      [int(x) for x in m.groups()] +
				      [-1,-1,-1])
			timestamp = time.mktime(time_tuple)
			if timestamp >= self._previous_timestamp: break
			self._date[2] += 1
			self._debug_line_disposition(timestamp,'',
				'new date '+`self._date`)

		self._previous_timestamp = timestamp

		l = l[l.find(' ')+1:]

		def ob_x(who,event):
			return self._onboard_event(timestamp, who, event)
		def ob1(did): ob_x(m.group(1), did); return d(did)
		def oba(did): return ob1('%s %s' % (did, m.group(2)))

		m = rm('Going aboard the (\\S.*\\S)\\.\\.\\.$')
		if m:
			pn = self._myself.name
			self._vessel = m.group(1)
			dm = 'boarding'

			try:		 self._v = self._vl[self._vessel]
			except KeyError: self._v = None; dm += ' new'
			
			if self._v is not None:	 la = self._v['#lastaboard']
			else:			 la = 0; dm += ' ?la'

			if timestamp - la > opts.ship_reboard_clearout:
				self.clear_vessel(timestamp)
				dm += ' stale'

			ob_x(pn, 'we boarded')
			self.expire_garbage(timestamp)
			return d(dm)

		if self._v is None:
			return d('no vessel')

		m = rm('(\\w+) has come aboard\\.$')
		if m: return ob1('boarded');

		m = rm('You have ordered (\\w+) to do some (\\S.*\\S)\\.$')
		if m:
			(who,what) = m.groups()
			pa = ob_x(who,'ord '+what)
			if what == 'Gunning':
				pa.gunner = True
			return d('duty order')

		m = rm('(\\w+) abandoned a (\\S.*\\S) station\\.$')
		if m: oba('stopped'); return d("end")

		def chat(what):
			who = m.group(1)
			try: pa = self._pl[who]
			except KeyError: return d('chat mystery')
			if pa.v is self._v:
				pa.last_chat_time = timestamp
				pa.last_chat_chan = what
				self.force_redisplay()
				return d(what+' chat')

		m = rm('(\\w+) (?:issued an order|ordered everyone) "')
		if m: return ob1('general order');

		m = rm('(\\w+) says, "')
		if m: return chat('public')

		m = rm('(\\w+) tells ye, "')
		if m: return chat('private')

		m = rm('(\\w+) flag officer chats, "')
		if m: return chat('flag officer')

		m = rm('(\\w+) officer chats, "')
		if m: return chat('officer')

		m = rm('Game over\\.  Winners: ([A-Za-z, ]+)\\.$')
		if m:
			pl = m.group(1).split(', ')
			if not self._myself.name in pl:
				return d('lost boarding battle')
			for pn in pl:
				if ' ' in pn: continue
				ob_x(pn,'won boarding battle')
			return d('won boarding battle')

		m = rm('(\\w+) is eliminated\\!')
		if m: return ob1('eliminated in fray');

		m = rm('(\\w+) has left the vessel\.')
		if m:
			who = m.group(1)
			ob_x(who, 'disembarked')
			del self._v[who]
			del self._pl[who]
			return d('disembarked')

		return d('not matched')

	def _str_vessel(self, vn, v):
		s = ' vessel %s\n' % vn
		s += ' '*20 + "%-*s   %13s\n" % (
				max_pirate_namelen, '#lastaboard',
				v['#lastaboard'])
		for pn in sorted(v.keys()):
			if pn.startswith('#'): continue
			pa = v[pn]
			assert pa.v == v
			assert self._pl[pn] == pa
			s += ' '*20 + "%s %-*s %13s %-30s %13s %s\n" % (
				(' ','G')[pa.gunner],
				max_pirate_namelen, pn,
				pa.last_time, pa.last_event,
				pa.last_chat_time, pa.last_chat_chan)
		return s

	def __str__(self):
		s = '''<ChatLogTracker
 myself %s
 vessel %s
'''			% (self._myself.name, self._vessel)
		assert ((self._v is None and self._vessel is None) or
			(self._v is self._vl[self._vessel]))
		if self._vessel is not None:
			s += self._str_vessel(self._vessel, self._v)
		for vn in sorted(self._vl.keys()):
			if vn == self._vessel: continue
			s += self._str_vessel(vn, self._vl[vn])
		for p in self._pl:
			pa = self._pl[p]
			assert pa.v[p] is pa
			assert pa.v in self._vl.values()
		s += '>\n'
		return s

	def catchup(self, progress=None):
		while True:
			more = self._f.readline()
			if not more: break

			self._progress[0] += len(more)
			if progress: progress.progress(*self._progress)

			self._lbuf += more
			if self._lbuf.endswith('\n'):
				self.chatline(self._lbuf.rstrip())
				self._lbuf = ''
		if progress: progress.caughtup()

	def changed(self):
		rv = self._need_redisplay
		self._need_redisplay = False
		return rv
	def myname(self):
		# returns our pirate name
		return self._myself.name
	def vessel(self):
		# returns the vessel we're aboard or None
		return self._vessel
	def aboard(self):
		# returns a list of PirateAboard sorted by name
		if self._v is None: return []
		return [ self._v[pn]
			 for pn in sorted(self._v.keys())
			 if not pn.startswith('#') ]

#---------- implementations of actual operation modes ----------

def do_pirate(pirates, bu):
	print '{'
	for pirate in pirates:
		info = PirateInfo(pirate)
		print '%s: %s,' % (`pirate`, info)
	print '}'

def prep_crew_of(args, bu, max_age=300):
	if len(args) != 1: bu('crew-of takes one pirate name')
	pi = PirateInfo(args[0], max_age)
	if pi.crew is None: return None
	return CrewInfo(pi.crew[0], max_age)

def do_crew_of(args, bu):
	ci = prep_crew_of(args, bu)
	print ci

def do_standings_crew_of(args, bu):
	ci = prep_crew_of(args, bu, 60)
	tab = StandingsTable()
	tab.headings()
	for (rank, members) in ci.crew:
		if not members: continue
		tab.literalline('%s:' % rank)
		for p in members:
			pi = PirateInfo(p, random.randint(900,1800))
			tab.pirate(pi)
	print tab.results()

class ProgressPrintPercentage:
	def __init__(self, f=sys.stdout):
		self._f = f
	def progress_string(self,done,total):
		return "scan chat logs %3d%%\r" % ((done*100) / total)
	def progress(self,*a):
		self._f.write(self.progress_string(*a))
		self._f.flush()
	def show_init(self, pirate, ocean):
		print >>self._f, 'Starting up, %s on the %s ocean' % (
			pirate, ocean)
	def caughtup(self):
		self._f.write('                   \r')
		self._f.flush()

#----- modes which use the chat log parser are quite complex -----

def prep_chat_log(args, bu,
		progress=ProgressPrintPercentage(),
		max_myself_age=3600):
	if len(args) != 1: bu('this action takes only chat log filename')
	logfn = args[0]
	logfn_re = '(?:.*/)?([A-Z][a-z]+)_([a-z]+)_'
	match = regexp.match(logfn_re, logfn)
	if not match: bu('chat log filename is not in expected format')
	(pirate, ocean) = match.groups()
	fetcher.default_ocean(ocean)
	
	myself = PirateInfo(pirate,max_myself_age)
	progress.show_init(pirate, fetcher.ocean)
	track = ChatLogTracker(myself, logfn)

	opts.debug -= 1
	track.catchup(progress)
	opts.debug += 1

	track.force_redisplay()

	return (myself, track)

def do_track_chat_log(args, bu):
	(myself, track) = prep_chat_log(args, bu)
	while True:
		track.catchup()
		if track.changed():
			print track
		time.sleep(1)

#----- ship management aid -----

class Display_dumb(ProgressPrintPercentage):
	def __init__(self):
		ProgressPrintPercentage.__init__(self)
	def show(self, s):
		print '\n\n', s;
	def realstart(self):
		pass

class Display_overwrite(ProgressPrintPercentage):
	def __init__(self):
		ProgressPrintPercentage.__init__(self)

		null = file('/dev/null','w')
		curses.setupterm(fd=null.fileno())

		self._clear = curses.tigetstr('clear')
		if not self._clear:
			self._debug('missing clear!')
			self.show = Display_dumb.show
			return

		self._t = {'el':'', 'ed':''}
		if not self._init_sophisticated():
			for k in self._t.keys(): self._t[k] = ''
			self._t['ho'] = self._clear

	def _debug(self,m): debug('display overwrite: '+m)

	def _init_sophisticated(self):
		for k in self._t.keys():
			s = curses.tigetstr(k)
			self._t[k] = s
		self._t['ho'] = curses.tigetstr('ho')
		if not self._t['ho']:
			cup = curses.tigetstr('cup')
			self._t['ho'] = curses.tparm(cup,0,0)
		missing = [k for k in self._t.keys() if not self._t[k]]
		if missing:
			self.debug('missing '+(' '.join(missing)))
			return 0
		return 1

	def show(self, s):
		w = sys.stdout.write
		def wti(k): w(self._t[k])

		wti('ho')
		nl = ''
		for l in s.rstrip().split('\n'):
			w(nl)
			w(l)
			wti('el')
			nl = '\r\n'
		wti('ed')
		w(' ')
		sys.stdout.flush()

	def realstart(self):
		sys.stdout.write(self._clear)
		sys.stdout.flush()
			

def do_ship_aid(args, bu):
	if opts.ship_duty is None: opts.ship_duty = True

	displayer = globals()['Display_'+opts.display]()
	rotate_nya = '/-\\'

	(myself, track) = prep_chat_log(args, bu, progress=displayer)

	def timeevent(t,e):
		if t is None: return ' ' * 22
		return " %-4s %-16s" % (format_time_interval(now - t),e)

	displayer.realstart()

	while True:
		track.catchup()
		now = time.time()

		s = "%s" % track.myname()

		vn = track.vessel()
		if vn is None: s += " not on a vessel?!"
		else: s += " on board the %s" % vn
		s += " at %s\n" % time.strftime("%Y-%m-%d %H:%M:%S")

		tbl = StandingsTable()
		tbl.headings()

		for pa in track.aboard():
			pi = pa.pirate_info()

			xs = ''
			if pa.gunner: xs += 'G '
			else: xs += '  '
			xs += timeevent(pa.last_time, pa.last_event)
			xs += timeevent(pa.last_chat_time, pa.last_chat_chan)

			if pi is None:
				tbl.pirate_dummy(pa.name, rotate_nya[0], xs)
			else:
				tbl.pirate(pi, xs)

		s += tbl.results()

		displayer.show(s)
		time.sleep(1)
		rotate_nya = rotate_nya[1:2] + rotate_nya[0]

#---------- main program ----------

def main():
	global opts, fetcher

	pa = OptionParser(
'''usage: .../yoweb-scrape [OPTION...] ACTION [ARGS...]
actions:
 yoweb-scrape [--ocean OCEAN ...] pirate PIRATE
 yoweb-scrape [--ocean OCEAN ...] crew-of PIRATE
 yoweb-scrape [--ocean OCEAN ...] standings-crew-of PIRATE
 yoweb-scrape [--ocean OCEAN ...] track-chat-log CHAT-LOG
 yoweb-scrape [options] ship-aid CHAT-LOG  (must be .../PIRATE_OCEAN_chat-log*)

display modes (for --display) apply to ship-aid:
 --display=dumb       just print new information, scrolling the screen
 --display=overwrite  use cursor motion, selective clear, etc. to redraw at top
''')
	ao = pa.add_option
	ao('-O','--ocean',dest='ocean', metavar='OCEAN', default=None,
		help='select ocean OCEAN')
	ao('--cache-dir', dest='cache_dir', metavar='DIR',
		default='~/.yoweb-scrape-cache',
		help='cache yoweb pages in DIR')
	ao('-D','--debug', action='count', dest='debug', default=0,
		help='enable debugging output')
	ao('--debug-fd', action='count', dest='debug_fd',
		help='write any debugging output to specified fd')
	ao('-q','--quiet', action='store_true', dest='quiet',
		help='suppress warning output')
	ao('--display', action='store', dest='display',
		type='choice', choices=['dumb','overwrite'],
		help='how to display ship aid')

	ao('--ship-duty', action='store_true', dest='ship_duty',
		help='show ship duty station puzzles')
	ao('--all-puzzles', action='store_false', dest='ship_duty',
		help='show all puzzles, not just ship duty stations')

	(opts,args) = pa.parse_args()
	random.seed()

	if len(args) < 1:
		pa.error('need a mode argument')

	if opts.debug_fd is not None:
		opts.debug_file = fdopen(opts.debug_fd, 'w')

	mode = args[0]
	mode_fn_name = 'do_' + mode.replace('_','#').replace('-','_')
	try: mode_fn = globals()[mode_fn_name]
	except KeyError: pa.error('unknown mode "%s"' % mode)

	# fixed parameters
	opts.min_max_age = 60
	opts.expire_age = 3600
	opts.ship_reboard_clearout = 3600

	if opts.cache_dir.startswith('~/'):
		opts.cache_dir = os.getenv('HOME') + opts.cache_dir[1:]

	if opts.display is None:
		if ((opts.debug > 0 and opts.debug_fd is None)
		    or not os.isatty(sys.stdout.fileno())):
			opts.display = 'dumb'
		else:
			opts.display = 'overwrite'

	fetcher = Fetcher(opts.ocean, opts.cache_dir)

	mode_fn(args[1:], pa.error)

main()