yrc/yrc.py [yrc_kill

yrc/yrc.py

1	"""
2	yrc: the Unix IRC client
3	Jacob Welsh
4	February 2017 - June 2019
5	"""
6
7	__version__ = '96 Kelvin'
8
9	# Knobs that one might conceivably want to tweak
10	KILL_RING_SIZE = 8
11	HISTORY_RING_SIZE = 1024
12	DEFAULT_PORT = 6667
13	RECONN_DELAY_MIN = 4 # seconds
14	RECONN_DELAY_MAX = 256
15	PING_INTERVAL = 120
16	PING_TIMEOUT = 240
17	BUFLIST_WIDTH_MIN = len('* =#a$\|')
18	BUFLIST_WIDTH_STEP = 4
19	BUFLIST_WIDTH_START = BUFLIST_WIDTH_MIN + 3*BUFLIST_WIDTH_STEP
20	format_time = lambda tt: '%02d:%02d:%02d' % (tt.tm_hour, tt.tm_min, tt.tm_sec)
21
22	from os import (
23	O_APPEND, O_CREAT, O_NONBLOCK, O_WRONLY, chdir, close, getenv, mkdir,
24	open as os_open, pipe, read, strerror, write
25	)
26	from time import localtime, time
27	from errno import EAGAIN, EWOULDBLOCK, EEXIST, EINPROGRESS, EINTR, ENOENT
28	from select import select, error as SelectError
29	from signal import signal, SIG_DFL, SIGINT, SIGWINCH
30	from socket import socket, SOL_SOCKET, SO_ERROR, SHUT_RDWR, error as SockError
31
32	from fcntl import fcntl, F_GETFL, F_SETFL
33
34	import yterm as t
35	from yterm import NUL, BS, LF, CR, SO, SI, ESC, CSI, cseq
36	STDIN = 0
37	STDOUT = 1
38	self_pipe_rd, self_pipe_wr = pipe()
39
40	is_ctrl = lambda c: c < '\x20' or c == '\x7f'
41	ctrl = lambda c: chr(ord(c) ^ 0x40)
42
43	meta = lambda c: ESC + c
44
45	BEL = chr(7)
46	CRLF = CR + LF
47	C_X = ctrl('X')
48	C_G = ctrl('G') # aka BEL
49
50	# Cursor control keys
51	LEFT = t.CURSOR_BACK1
52	RIGHT = t.CURSOR_FORWARD1
53	UP = t.CURSOR_UP1
54	DOWN = t.CURSOR_DOWN1
55	HOME = t.CURSOR_HOME
56	# Not sure where these originate; vt220 perhaps? Seen on xterm, linux, screen
57	END = cseq('F')
58	INS = cseq('~', 2)
59	DEL = cseq('~', 3)
60	PGUP = cseq('~', 5)
61	PGDN = cseq('~', 6)
62	# Likewise; so far seen on linux, screen
63	LNX_HOME = cseq('~', 1)
64	LNX_END = cseq('~', 4)
65
66	GLOBAL_KEYS = {
67	C_X + 'n': 'buflist-switch-next',
68	C_X + 'p': 'buflist-switch-prev',
69	C_X + 'l': 'buflist-last-selected',
70	C_X + 'w': 'buflist-enter',
71	ctrl('L'): 'redraw',
72	}
73
74	PROMPT_KEYS = {
75	CR: 'prompt-submit',
76
77	INS: 'prompt-exit',
78
79	ctrl('F'): 'prompt-forward',
80	RIGHT: 'prompt-forward',
81
82	ctrl('B'): 'prompt-back',
83	LEFT: 'prompt-back',
84
85	ctrl('A'): 'prompt-start',
86	HOME: 'prompt-start',
87	LNX_HOME: 'prompt-start',
88
89	ctrl('E'): 'prompt-end',
90	END: 'prompt-end',
91	LNX_END: 'prompt-end',
92
93	ctrl('P'): 'history-prev',
94	UP: 'history-prev',
95
96	ctrl('N'): 'history-next',
97	DOWN: 'history-next',
98
99	ctrl('H'): 'prompt-backspace',
100	ctrl('?'): 'prompt-backspace',
101
102	ctrl('D'): 'prompt-delete',
103	DEL: 'prompt-delete',
104
105	ctrl('U'): 'kill-start',
106
107	ctrl('K'): 'kill-end',
108
109	ctrl('Y'): 'yank',
110
111	meta('y'): 'yank-next',
112
113	meta('v'): 'scroll-up-page',
114	PGUP: 'scroll-up-page',
115
116	ctrl('V'): 'scroll-down-page',
117	PGDN: 'scroll-down-page',
118
119	meta('<'): 'scroll-top',
120
121	meta('>'): 'scroll-bottom',
122	}
123
124	BUFLIST_KEYS = {
125	CR: 'buflist-submit',
126
127	ctrl('N'): 'buflist-next',
128	DOWN: 'buflist-next',
129	'j': 'buflist-next',
130
131	ctrl('P'): 'buflist-prev',
132	UP: 'buflist-prev',
133	'k': 'buflist-prev',
134
135	meta('<'): 'buflist-top',
136	HOME: 'buflist-top',
137	LNX_HOME: 'buflist-top',
138	'g': 'buflist-top',
139
140	meta('>'): 'buflist-bottom',
141	END: 'buflist-bottom',
142	LNX_END: 'buflist-bottom',
143	'G': 'buflist-bottom',
144
145	'h': 'buflist-shrink',
146	LEFT: 'buflist-shrink',
147
148	'l': 'buflist-grow',
149	RIGHT: 'buflist-grow',
150	}
151
152	BUF_KEYS = {
153	'i': 'prompt-enter',
154	INS: 'prompt-enter',
155
156	meta('v'): 'scroll-up-page',
157	PGUP: 'scroll-up-page',
158	ctrl('B'): 'scroll-up-page',
159	'b': 'scroll-up-page',
160
161	ctrl('V'): 'scroll-down-page',
162	PGDN: 'scroll-down-page',
163	ctrl('F'): 'scroll-down-page',
164	'f': 'scroll-down-page',
165	' ': 'scroll-down-page',
166
167	ctrl('P'): 'scroll-up-line',
168	UP: 'scroll-up-line',
169	'k': 'scroll-up-line',
170
171	ctrl('N'): 'scroll-down-line',
172	DOWN: 'scroll-down-line',
173	'j': 'scroll-down-line',
174
175	meta('<'): 'scroll-top',
176	HOME: 'scroll-top',
177	LNX_HOME: 'scroll-top',
178	'g': 'scroll-top',
179
180	meta('>'): 'scroll-bottom',
181	END: 'scroll-bottom',
182	LNX_END: 'scroll-bottom',
183	'G': 'scroll-bottom',
184	}
185
186	CMD_ABBREVS = {
187	'c': 'connect',
188	'd': 'disconnect',
189	'j': 'join',
190	'k': 'kick',
191	'l': 'list',
192	'm': 'mode',
193	'n': 'nick',
194	'nam': 'names',
195	'p': 'part',
196	'q': 'quit',
197	's': 'send',
198	't': 'topic',
199	'st': 'set-topic',
200	'w': 'whois',
201	'ww': 'whowas',
202	'x': 'close',
203	'xn': 'close-net',
204	}
205
206	# file.write can barf up EINTR and unclear how to retry due to buffering. Nuts.
207	def write_all(fd, s):
208	n = 0
209	while n < len(s):
210	try:
211	n += write(fd, s[n:])
212	except EnvironmentError, e:
213	if e.errno != EINTR:
214	raise
215
216	out_buf = bytearray()
217	write_out = out_buf.extend
218	def flush_out():
219	write_all(STDOUT, out_buf)
220	del out_buf[:]
221
222	# MLtronics
223	def variant(vtype, name, nargs):
224	tag = (vtype, len(vtype), name)
225	def cons(*args):
226	if len(args) != nargs:
227	raise TypeError('%s takes %d args (%d given)'
228	% (name, nargs, len(args)))
229	return (tag, args)
230	vtype.append((name, cons))
231	return cons
232
233	variant_name = lambda val: val[0][2]
234	variant_args = lambda val: val[1]
235
236	def matcher(vtype, cases):
237	def receiver(name, cons):
238	for case, recv in cases:
239	if case is cons:
240	return recv
241	raise TypeError('missing case %s' % name)
242	tbl = [receiver(name, cons) for name, cons in vtype]
243	def match(val):
244	tag, args = val
245	if tag[0] is not vtype:
246	raise TypeError
247	return tbl[tag[1]](*args)
248	return match
249
250	message = []
251	m_privmsg = variant(message, 'PRIVMSG', 2)
252	m_notice = variant(message, 'NOTICE', 2)
253	m_join = variant(message, 'JOIN', 2)
254	m_part = variant(message, 'PART', 3)
255	m_quit = variant(message, 'QUIT', 2)
256	m_nick = variant(message, 'NICK', 2)
257	m_kick = variant(message, 'KICK', 4) # kick of specified user
258	m_kicked = variant(message, 'KICKED', 3) # kick of self
259	m_topic = variant(message, 'TOPIC', 2) # unifies TOPIC and RPL_(NO)TOPIC
260	m_chantopic = variant(message, 'CHANTOPIC', 3) # for unjoined channels
261	m_mode = variant(message, 'MODE', 2)
262	m_chanmode = variant(message, 'CHANMODE', 3)
263	m_names = variant(message, 'NAMES', 3)
264	m_endnames = variant(message, 'ENDNAMES', 2)
265	m_error = variant(message, 'ERROR', 2) # ERROR from server
266	m_client = variant(message, 'CLIENT', 1) # generated by client, not logged
267	m_server = variant(message, 'SERVER', 2) # catch-all for other server msgs
268
269	scr_height = None
270	scr_width = None
271
272	def sequence(*thunks):
273	def run():
274	for f in thunks:
275	f()
276	return run
277
278	def char_range(pair):
279	a, b = pair
280	return ''.join(map(chr, range(ord(a), ord(b) + 1)))
281
282	def partition(l, pred):
283	left = []
284	right = []
285	for elem in l:
286	if pred(elem):
287	left.append(elem)
288	else:
289	right.append(elem)
290	return left, right
291
292	def split_pair(s, sep=' '):
293	pair = s.split(sep, 1)
294	if len(pair) == 1:
295	pair.append('')
296	return pair
297
298	def make_encoder(f):
299	tbl = [f(i) for i in range(0x100)]
300	return lambda s: ''.join(tbl[ord(c)] for c in s)
301
302	# Non-invertible terminal sanitizing
303	asciify = make_encoder(lambda i:
304	'^' + ctrl(chr(i)) if i < 0x20 or i == 0x7f
305	else chr(i) if 0x20 <= i <= 0x7e
306	else '\\x%X' % i)
307
308	# Uglier, injective encoding for file names
309	fs_encode = make_encoder(lambda i:
310	chr(i) if 0x20 <= i <= 0x7e and chr(i) not in './%'
311	else '%' + ('%02X' % i))
312
313	make_casemapper = lambda upper_bound: make_encoder(lambda i:
314	chr(i + 0x20) if 0x41 <= i <= upper_bound
315	else chr(i))
316
317	# We currently support only the original IRC case mapping (as implemented, not
318	# as specified; one of many howlers in the RFC). The RPL_ISUPPORT reply that
319	# some servers use to advertise alternate mappings was specified in a draft
320	# long since expired
321	# (http://www.irc.org/tech_docs/draft-brocklesby-irc-isupport-03.txt). Besides,
322	# a case-insensitive protocol that can't agree on what "case" means is
323	# preposterous. This is an IRC client; if a server does not behave like an IRC
324	# server, it doesn't fall to us to decipher its nonsense.
325
326	IRC_CASEMAP = {'rfc1459': make_casemapper(0x5e)}
327
328	casemap_ascii = make_casemapper(0x5a)
329
330	clip = lambda min_, max_, x: max(min_, min(max_, x))
331	clip_to = lambda l, i: clip(0, len(l) - 1, i)
332	get_clipped = lambda l, i: l[clip_to(l, i)]
333
334	def clip_str(s, width):
335	if width == 0:
336	return ''
337	if len(s) > width:
338	return '%s$' % s[:width - 1]
339	return s
340
341	def pad_or_clip_str(s, width, pad=' '):
342	if len(s) < width:
343	return s + pad*(width - len(s))
344	return clip_str(s, width)
345
346	def wrap(line, width, sep=' '):
347	width = max(1, width)
348	start = 0
349	lines = []
350	while start + width < len(line):
351	end = start + width
352	cut = line.rfind(sep, start, end + 1)
353	if cut == -1:
354	lines.append(line[start:end])
355	start = end
356	else:
357	lines.append(line[start:cut])
358	start = cut + 1
359	lines.append(line[start:])
360	return lines
361
362	def is_digit(c):
363	return '0' <= c <= '9'
364
365	def parse_address(addr):
366	addr = addr.rsplit(':', 1)
367	host = addr[0]
368	if len(addr) == 1:
369	port = DEFAULT_PORT
370	else:
371	port = addr[1]
372	if not all(map(is_digit, port)):
373	raise ValueError('port not a positive integer: %r' % port)
374	port = int(port)
375	if port >= 2**16:
376	raise ValueError('port out of range: %d' % port)
377	return host, port
378
379	format_address = lambda host_port: '%s:%d' % host_port
380
381	int_of_bytes = lambda b: reduce(lambda acc, byte: acc*256 + ord(byte), b, 0)
382
383	# int.bit_length() added in Python 2.7
384	bit_length = lambda i: len(bin(i).lstrip('-0b'))
385
386	def rand_int(n):
387	"""Get a random integer from 0 (inclusive) to n (exclusive) using the
388	system's nonblocking entropy pool. More-or-less deterministic run time, at
389	the cost of a small modulo bias."""
390	nbytes = (bit_length(n) + 7) / 8
391	with open('/dev/urandom', 'rb') as f:
392	return int_of_bytes(f.read(2*nbytes)) % n
393
394	#
395	# Binary min-heap, used as priority queue for scheduling
396	#
397
398	def heap_insert(h, key, value):
399	h.append((key, value))
400	# Percolate up
401	i = len(h) - 1
402	while i > 0:
403	i_parent = (i - 1)/2
404	item = h[i]
405	parent = h[i_parent]
406	if parent[0] <= item[0]:
407	break
408	h[i] = parent
409	h[i_parent] = item
410	i = i_parent
411
412	heap_peek = lambda h: h[0]
413
414	def heap_extract(h):
415	if len(h) == 1:
416	return h.pop()
417	result = h[0]
418	h[0] = h.pop()
419	# Percolate down
420	i = 0
421	while True:
422	i_child = 2*i + 1
423	if i_child >= len(h):
424	break
425	i_right = i_child + 1
426	if i_right < len(h) and h[i_right][0] < h[i_child][0]:
427	i_child = i_right
428	item = h[i]
429	child = h[i_child]
430	if item[0] <= child[0]:
431	break
432	h[i] = child
433	h[i_child] = item
434	i = i_child
435	return result
436
437	# purely for testing
438	def heapsort(iterable):
439	h = []
440	for item in iterable:
441	heap_insert(h, item, None)
442	while h:
443	yield heap_extract(h)[0]
444
445	# Rings (cyclic lists) for input history and kills
446
447	new_ring = lambda size: [0, [None]*size]
448	ring_start = lambda r: r[0]
449	ring_list = lambda r: r[1]
450	ring_set_start = lambda r, k: r.__setitem__(0, k)
451
452	ring_len = lambda r: len(ring_list(r))
453	ring_index = lambda r, k: (ring_start(r) + k) % len(ring_list(r))
454	ring_get = lambda r, k: ring_list(r)[ring_index(r, k)]
455	ring_set = lambda r, k, v: ring_list(r).__setitem__(ring_index(r, k), v)
456	ring_rotate = lambda r, k: ring_set_start(r, ring_index(r, k))
457
458	def ring_append(r, v):
459	# By analogy to an appended list, the idea is that the virtual indices 0 to N-1 address the entries oldest to newest (equivalently, -N to -1). The analogy breaks in that the "low" entries start out as None (uninitialized), with the appended items appearing to shift in from high to low, 0 being the last entry filled.
460	ring_set(r, 0, v)
461	ring_rotate(r, 1)
462
463	#
464	# Config
465	#
466
467	def safe_filename(name):
468	return '/' not in name and name not in ('', '.', '..')
469
470	def get_config(key, paths=(()), default=None):
471	assert safe_filename(key)
472	for path in paths:
473	assert all(map(safe_filename, path))
474	fspath = []
475	fspath.extend(path)
476	fspath.append(key)
477	try:
478	with open('/'.join(fspath), 'rb') as f:
479	return f.read().rstrip('\n')
480	except EnvironmentError, e:
481	if e.errno != ENOENT:
482	error(e)
483	return default
484
485	def config_lines(text):
486	if text is None:
487	return None
488	lines = text.split('\n')
489	lines = [l.strip() for l in lines if not l.startswith('#')]
490	lines = [l for l in lines if len(l) > 0]
491	return lines if lines else None
492
493	#
494	# UI stuff
495	#
496
497	class CommandError(Exception):
498	pass
499
500	commands = {}
501	def command(name, min_args=0, max_args=None, extended_arg=False):
502	if max_args is None:
503	max_args = min_args
504	def register(func):
505	if name in commands:
506	raise ValueError('duplicate command %s' % name)
507	def run(arg_str=''):
508	args = []
509	while len(args) != max_args:
510	arg, arg_str = split_pair(arg_str.lstrip())
511	if arg == '':
512	break
513	args.append(arg)
514	arg_str = arg_str.lstrip()
515	if extended_arg:
516	args.append(arg_str)
517	elif arg_str:
518	raise CommandError('%s: too many arguments' % name)
519	if len(args) < min_args:
520	raise CommandError('%s: too few arguments' % name)
521	return func(*args)
522	commands[name] = run
523	return func
524	return register
525
526	def check_command_dicts(dicts):
527	for d in dicts:
528	for cmd in d.itervalues():
529	assert cmd in commands, cmd
530
531	def run_command(line):
532	cmd, args = split_pair(line)
533	cmd = CMD_ABBREVS.get(cmd, cmd)
534	func = commands.get(cmd)
535	if func is None:
536	raise CommandError('bad command: %s' % cmd)
537	return func(args)
538
539	flags = [False]*12
540	_getf = lambda i: (lambda: flags[i])
541	_setf = lambda i: (lambda: flags.__setitem__(i, True))
542	_clrf = lambda i: (lambda: flags.__setitem__(i, False))
543
544	refresh_flag = _getf(0)
545	schedule_refresh = _setf(0)
546	refresh_done = _clrf(0)
547
548	redraw_flag = _getf(1)
549	schedule_redraw = _setf(1)
550	redraw_done = _clrf(1)
551
552	buflist_draw_flag = _getf(2)
553	schedule_buflist_draw = _setf(2)
554	buflist_draw_done = _clrf(2)
555
556	buf_draw_flag = _getf(3)
557	schedule_buf_draw = _setf(3)
558	buf_draw_done = _clrf(3)
559
560	prompt_draw_flag = _getf(4)
561	schedule_prompt_draw = _setf(4)
562	prompt_draw_done = _clrf(4)
563
564	status_draw_flag = _getf(5)
565	schedule_status_draw = _setf(5)
566	status_draw_done = _clrf(5)
567
568	quit_flag = _getf(6)
569	schedule_quit = _setf(6)
570
571	# 7-8: available
572
573	buflist_flag = _getf(9)
574	buflist_enter = _setf(9)
575	buflist_exit = _clrf(9)
576
577	prompt_flag = _getf(10)
578	prompt_enter = _setf(10)
579	prompt_exit = _clrf(10)
580
581	ping_draw_flag = _getf(11)
582	set_ping_draw = _setf(11)
583	clr_ping_draw = _clrf(11)
584
585	new_buf = lambda name, parent, title: [name, parent, title,
586	(0, 0), [], 0, True]
587
588	buf_name = lambda b: b[0]
589	buf_parent = lambda b: b[1]
590	buf_title = lambda b: b[2]
591	buf_vscroll = lambda b: b[3]
592	buf_lines = lambda b: b[4]
593	buf_num_read = lambda b: b[5]
594	buf_unread = lambda b: len(buf_lines(b)) - buf_num_read(b)
595	buf_at_end = lambda b: b[6]
596
597	buf_set_title = lambda b, title: b.__setitem__(2, title)
598	buf_set_vscroll = lambda b, coords: b.__setitem__(3,
599	(clip_to(buf_lines(b), coords[0]), coords[1]))
600	buf_set_num_read = lambda b, n: b.__setitem__(5, max(buf_num_read(b), n))
601	buf_set_at_end = lambda b: b.__setitem__(6, True)
602	buf_clr_at_end = lambda b: b.__setitem__(6, False)
603
604	format_buf_msg = matcher(message, (
605	(m_privmsg, lambda sender, msg: '<%s> %s' % (sender, msg)),
606	(m_server, lambda sender, msg: '<%s> %s' % (sender, msg)),
607	(m_notice, lambda sender, msg: '<-%s-> %s' % (sender, msg)),
608	(m_join, lambda sender, chan: '%s joins %s' % (sender, chan)),
609	(m_part, lambda sender, chan, msg: '%s parts %s [%s]'
610	% (sender, chan, msg)),
611	(m_quit, lambda sender, msg: '%s quits [%s]' % (sender, msg)),
612	(m_nick, lambda sender, nick: '%s is now known as %s' % (sender, nick)),
613	(m_kick, lambda sender, chan, name, msg: '%s kicked from %s by %s [%s]'
614	% (name, chan, sender, msg)),
615	(m_kicked, lambda sender, chan, msg: 'kicked from %s by %s [%s]'
616	% (chan, sender, msg)),
617	(m_topic, lambda sender, topic:
618	'%s sets topic to %s' % (sender, topic)
619	if topic else
620	'%s removes topic' % sender),
621	(m_chantopic, lambda sender, chan, topic:
622	'<%s> Topic for %s: %s' % (sender, chan, topic)
623	if topic is not None else
624	'<%s> No topic for %s' % (sender, chan)),
625	(m_mode, lambda sender, modes: 'MODE %s by %s' % (modes, sender)),
626	(m_chanmode, lambda sender, chan, modes: 'MODE %s on %s by %s'
627	% (modes, chan, sender)),
628	(m_names, lambda sender, chan, names: '<%s> NAMES in %s: %s'
629	% (sender, chan, names)),
630	(m_endnames, lambda sender, chan: '<%s> end NAMES in %s'
631	% (sender, chan)),
632	(m_error, lambda sender, msg: '<%s> server error: %s' % (sender, msg)),
633	(m_client, lambda msg: msg)))
634
635	def buf_log_msg(buf, m):
636	buf_lines(buf).append(format_time(localtime()) + ' ' + format_buf_msg(m))
637	schedule_buflist_draw() # for unread counts
638	if buf is cur_buf and buf_at_end(buf):
639	schedule_buf_draw()
640
641	def buf_privmsg(buf, msg):
642	if buf_parent(buf) is None:
643	raise CommandError("can't send messages here")
644	conn_privmsg(buf_registered_conn(buf), buf_name(buf), msg)
645
646	buf_width = lambda: scr_width - buflist_width()
647	buf_height = lambda: scr_height - 3
648	render_line = lambda line: wrap(asciify(line), buf_width())
649
650	def buf_max_vscroll(buf):
651	lines = buf_lines(buf)
652	if len(lines) == 0:
653	return 0, 0
654	origin = len(lines) - 1
655	return origin, len(render_line(lines[origin])) - 1
656
657	def add_scroll_coords(lines, coords, delta):
658	origin, offset = coords
659	if origin >= len(lines):
660	return max(1, len(lines)) - 1, 0
661	delta += offset
662	while delta > 0:
663	n_rows = len(render_line(lines[origin]))
664	if n_rows > delta:
665	break
666	delta -= n_rows
667	origin += 1
668	if origin == len(lines): # past the last line
669	return origin - 1, n_rows - 1
670	return origin, delta
671
672	def sub_scroll_coords(lines, coords, delta):
673	origin, offset = coords
674	if offset >= delta:
675	return origin, offset - delta
676	delta -= offset
677	while origin > 0:
678	origin -= 1
679	n_rows = len(render_line(lines[origin]))
680	if n_rows >= delta:
681	return origin, n_rows - delta
682	delta -= n_rows
683	return 0, 0
684
685	def render_lines(lines, coords, row_limit):
686	origin, offset = coords
687	rows = []
688	row_limit += offset
689	while len(rows) < row_limit and origin < len(lines):
690	group = render_line(lines[origin])
691	space = row_limit - len(rows)
692	if len(group) > space:
693	group = group[:space]
694	else:
695	origin += 1
696	rows.extend(group)
697	return rows[offset:], origin
698
699	def buf_draw(buf):
700	if scr_height < 2:
701	return
702	schedule_refresh()
703	write_out(t.CURSOR_HOME)
704	write_out(t.render((
705	t.A_REVERSE, pad_or_clip_str(asciify(buf_title(buf)), scr_width))))
706	left_column = buflist_width() + 1
707	w = buf_width()
708	h = buf_height()
709	if w < 1 or h < 1:
710	return
711	top_row = 2
712	lines = buf_lines(buf)
713	rows, next_origin = render_lines(lines, buf_vscroll(buf), h)
714	if next_origin == len(lines):
715	buf_set_at_end(buf)
716	elif buf_at_end(buf):
717	# no longer at end: autoscroll
718	buf_set_vscroll(buf,
719	sub_scroll_coords(lines, buf_max_vscroll(buf), h - 1))
720	rows, next_origin = render_lines(lines, buf_vscroll(buf), h)
721	buf_set_num_read(buf, next_origin)
722	n = -1
723	for n, row in enumerate(rows):
724	write_out(t.cursor_pos(top_row + n, left_column))
725	write_out(row)
726	if len(row) < w:
727	write_out(t.ERASE_LINE_TO_END)
728	for n in range(n + 1, h):
729	write_out(t.cursor_pos(top_row + n, left_column))
730	write_out(t.ERASE_LINE_TO_END)
731	buf_draw_done()
732
733	cur_buf = new_buf('yrc', None, 'yrc general messages')
734	buffers = [cur_buf]
735	buffer_index = {}
736
737	is_child_of = lambda parent: lambda buf: buf_parent(buf) is parent
738
739	def sort_buffers():
740	global buffers
741	schedule_buflist_draw()
742	# "yrc" is always first
743	acc, buffers = buffers[:1], buffers[1:]
744	roots, buffers = partition(buffers, is_child_of(None))
745	roots.sort(key=buf_name)
746	for root in roots:
747	children, buffers = partition(buffers, is_child_of(root))
748	children.sort(key=buf_name)
749	acc.append(root)
750	acc.extend(children)
751	buffers = acc
752	buffer_index.clear()
753	for b in buffers:
754	parent = buf_parent(b)
755	parent_name = buf_name(parent) if parent else None
756	buffer_index[(buf_name(b), parent_name)] = b
757
758	def get_buf(name, parent_name):
759	try:
760	return buffer_index[(name, parent_name)]
761	except KeyError:
762	if parent_name is None:
763	parent = None
764	title = 'Network messages: %s' % name
765	else:
766	parent = get_buf(parent_name, None)
767	title = name if is_chan(name) else 'Private messages: %s' % name
768	b = new_buf(name, parent, title)
769	buffers.append(b)
770	sort_buffers()
771	return b
772
773	def find_buf(buf):
774	for i, b in enumerate(buffers):
775	if b is buf:
776	return i
777	raise ValueError("not in buffer list")
778
779	def close_buf(buf):
780	i = find_buf(buf)
781	assert i > 0
782	last = buflist_last()
783	if last is buf:
784	last = buffers[i - 1]
785	buflist_select(last)
786	buflist_set_last(last)
787	parent = buf_parent(buf)
788	parent_name = buf_name(parent) if parent else None
789	del buffer_index[(buf_name(buf), parent_name)]
790	buffers.pop(i)
791
792	command('scroll-down-page')(sequence(
793	schedule_buf_draw,
794	schedule_buflist_draw, # update unread counts
795	lambda: buf_set_vscroll(cur_buf,
796	add_scroll_coords(buf_lines(cur_buf),
797	buf_vscroll(cur_buf), buf_height() - 1))))
798
799	command('scroll-up-page')(sequence(
800	schedule_buf_draw,
801	lambda: buf_set_vscroll(cur_buf,
802	sub_scroll_coords(buf_lines(cur_buf),
803	buf_vscroll(cur_buf), buf_height() - 1)),
804	# Stop autoscrolling, to be resumed by buf_draw if it turns out the last line is still on screen
805	lambda: buf_clr_at_end(cur_buf)))
806
807	command('scroll-down-line')(sequence(
808	schedule_buf_draw,
809	schedule_buflist_draw,
810	lambda: buf_set_vscroll(cur_buf,
811	add_scroll_coords(buf_lines(cur_buf),
812	buf_vscroll(cur_buf), 1))))
813
814	command('scroll-up-line')(sequence(
815	schedule_buf_draw,
816	lambda: buf_set_vscroll(cur_buf,
817	sub_scroll_coords(buf_lines(cur_buf),
818	buf_vscroll(cur_buf), 1)),
819	lambda: buf_clr_at_end(cur_buf)))
820
821	command('scroll-bottom')(sequence(
822	schedule_buf_draw,
823	schedule_buflist_draw,
824	lambda: buf_set_vscroll(cur_buf, buf_max_vscroll(cur_buf))))
825
826	command('scroll-top')(sequence(
827	schedule_buf_draw,
828	lambda: buf_set_vscroll(cur_buf, (0, 0)),
829	lambda: buf_clr_at_end(cur_buf)))
830
831	def info(msg, buf=None):
832	buf_log_msg(buf or buffers[0], m_client(msg))
833
834	def error(msg_or_exc, buf=None):
835	buf_log_msg(buf or buffers[0], m_client('ERROR: ' + str(msg_or_exc)))
836
837	# The prompt is a one-line text input field at the bottom of the screen, spanning its width. This record tracks its state.
838	prompt = [[], 0, 0, 1]
839
840	prompt_chars = lambda: prompt[0]
841	prompt_cursor = lambda: prompt[1]
842	prompt_hscroll = lambda: prompt[2]
843	prompt_cursor_column = lambda: prompt[3]
844
845	def prompt_set_cursor(c):
846	schedule_prompt_draw()
847	if 0 <= c <= len(prompt_chars()):
848	prompt[1] = c
849	return True
850	return False
851
852	def prompt_set_hscroll(s):
853	schedule_prompt_draw()
854	prompt[2] = s
855
856	def prompt_set_cursor_column(c):
857	prompt[3] = c
858
859	def prompt_clear():
860	schedule_prompt_draw()
861	del prompt_chars()[:]
862	prompt_set_cursor(0)
863	prompt_set_hscroll(0)
864
865	history_ring = new_ring(HISTORY_RING_SIZE)
866	history_pos = None
867	history_stash = None
868
869	kill_ring = new_ring(KILL_RING_SIZE)
870	kill_pos = None
871	yank_start_pos = None
872	yank_end_pos = None
873
874	def exit_yank():
875	global kill_pos, yank_start_pos, yank_end_pos
876	kill_pos = None
877	yank_start_pos = None
878	yank_end_pos = None
879
880	# Commands from the prompt keymap known to not require resetting the yank state, i.e. those that can't change the prompt's contents or move its cursor.
881	YANK_SAFE_COMMANDS = set((
882	'prompt-exit',
883	'yank-next',
884	'scroll-up-page',
885	'scroll-down-page',
886	'scroll-top',
887	'scroll-bottom',
888	))
889
890	def prompt_insert(char):
891	schedule_prompt_draw()
892	c = prompt_cursor()
893	prompt_chars().insert(c, char)
894	prompt_set_cursor(c + 1)
895
896	@command('prompt-submit')
897	def prompt_submit():
898	global history_pos, history_stash
899	line = ''.join(prompt_chars())
900	if len(line) == 0:
901	return
902	ring_append(history_ring, line)
903	history_pos = None
904	history_stash = None
905	prompt_clear()
906	schedule_prompt_draw()
907	try:
908	if line.startswith('/'):
909	line = line[1:]
910	if not line:
911	raise CommandError('empty command')
912	if not line.startswith('/'):
913	run_command(line)
914	return
915	buf_privmsg(cur_buf, line)
916	except CommandError, e:
917	error(e, cur_buf)
918
919	command('prompt-forward')(lambda: prompt_set_cursor(prompt_cursor() + 1))
920	command('prompt-back')(lambda: prompt_set_cursor(prompt_cursor() - 1))
921	command('prompt-start')(lambda: prompt_set_cursor(0))
922
923	@command('prompt-end')
924	def prompt_end():
925	prompt_set_cursor(len(prompt_chars()))
926
927	@command('history-prev')
928	def history_prev():
929	global history_pos, history_stash
930	if ring_get(history_ring, -1) is None:
931	# Empty history
932	return
933	if history_pos is None:
934	# Editing a fresh line: stash it and enter history
935	history_stash = ''.join(prompt_chars())
936	history_pos = ring_len(history_ring)
937	elif history_pos == 0 or ring_get(history_ring, history_pos-1) is None:
938	# Already at oldest initialized position
939	return
940	history_pos -= 1
941	# Copy into the current prompt input. The string from history is immutable as it should be! (GNU Readline fails here)
942	prompt_clear()
943	prompt_chars().extend(ring_get(history_ring, history_pos))
944	prompt_end()
945	schedule_prompt_draw()
946
947	@command('history-next')
948	def history_next():
949	global history_pos, history_stash
950	if history_pos is None:
951	# Editing a fresh line: not in history
952	return
953	history_pos += 1
954	prompt_clear()
955	if history_pos < ring_len(history_ring):
956	prompt_chars().extend(ring_get(history_ring, history_pos))
957	else:
958	# Past the end: exit history and restore from stash (pdksh fails here)
959	history_pos = None
960	prompt_chars().extend(history_stash)
961	history_stash = None
962	prompt_end()
963	schedule_prompt_draw()
964
965	@command('prompt-backspace')
966	def prompt_backspace():
967	c = prompt_cursor() - 1
968	if c >= 0:
969	prompt_set_cursor(c)
970	prompt_chars().pop(c)
971	schedule_prompt_draw()
972
973	@command('prompt-delete')
974	def prompt_delete():
975	c = prompt_cursor()
976	chars = prompt_chars()
977	if c < len(chars):
978	chars.pop(c)
979	schedule_prompt_draw()
980
981	@command('kill-start')
982	def kill_start():
983	c = prompt_cursor()
984	if c > 0: # Don't send empty strings to the kill ring
985	chars = prompt_chars()
986	ring_append(kill_ring, ''.join(chars[:c]))
987	prompt_set_cursor(0)
988	del chars[:c]
989	schedule_prompt_draw()
990
991	@command('kill-end')
992	def kill_end():
993	c = prompt_cursor()
994	chars = prompt_chars()
995	if c < len(chars): # Don't send empty strings to the kill ring
996	ring_append(kill_ring, ''.join(chars[c:]))
997	del chars[c:]
998	schedule_prompt_draw()
999
1000	@command('yank')
1001	def yank():
1002	global kill_pos, yank_start_pos, yank_end_pos
1003	# Always start from most recent kill (pdksh and GNU Readline disagree here; I favor the former's way, as it matches history behavior and reduces hidden state)
1004	saved = ring_get(kill_ring, -1)
1005	if saved is None:
1006	# Empty kill ring
1007	return
1008	kill_pos = ring_len(kill_ring) - 1
1009	yank_start_pos = prompt_cursor()
1010	yank_end_pos = yank_start_pos + len(saved)
1011	chars = prompt_chars()
1012	tail = chars[yank_start_pos:]
1013	del chars[yank_start_pos:]
1014	chars.extend(saved)
1015	chars.extend(tail)
1016	prompt_set_cursor(yank_end_pos)
1017	schedule_prompt_draw()
1018
1019	@command('yank-next')
1020	def yank_next():
1021	global kill_pos, yank_end_pos
1022	if kill_pos is None:
1023	# Nothing yanked yet
1024	return
1025	if kill_pos == 0 or ring_get(kill_ring, kill_pos-1) is None:
1026	# Past oldest initialized kill slot: wrap back to newest
1027	kill_pos = ring_len(kill_ring)
1028	kill_pos -= 1
1029	saved = ring_get(kill_ring, kill_pos)
1030	chars = prompt_chars()
1031	assert yank_end_pos == prompt_cursor()
1032	# ^ something changed and we failed to call exit_yank(), so the positions are no longer valid
1033	tail = chars[yank_end_pos:]
1034	del chars[yank_start_pos:]
1035	chars.extend(saved)
1036	chars.extend(tail)
1037	yank_end_pos = yank_start_pos + len(saved)
1038	prompt_set_cursor(yank_end_pos)
1039	schedule_prompt_draw()
1040
1041	def prompt_draw():
1042	if scr_height < 1:
1043	return
1044	write_out(t.cursor_pos(scr_height, 1))
1045	if scr_width < 4:
1046	write_out(t.ERASE_LINE_TO_END)
1047	return
1048	prompt_str = '> '
1049	write_out(prompt_str)
1050	chars = prompt_chars()
1051	cursor = prompt_cursor()
1052	hscr = prompt_hscroll()
1053	before_cursor = asciify(chars[:cursor])
1054	cursor_offset = len(before_cursor) - hscr
1055	max_width = scr_width - len(prompt_str)
1056	if not 0 <= cursor_offset < max_width:
1057	hscr = max(0, hscr + cursor_offset - max_width/2)
1058	prompt_set_hscroll(hscr)
1059	cursor_offset = len(before_cursor) - hscr
1060	prompt_set_cursor_column(1 + len(prompt_str) + cursor_offset)
1061	printable = (before_cursor[hscr:] +
1062	asciify(chars[cursor:])[:max_width - cursor_offset])
1063	write_out(printable)
1064	write_out(t.ERASE_LINE_TO_END)
1065	schedule_refresh()
1066	prompt_draw_done()
1067
1068	def conn_ping_status(c):
1069	t0 = conn_ping_ts(c)
1070	t1 = conn_pong_ts(c)
1071	if t1 < t0:
1072	if not ping_draw_flag():
1073	set_ping_draw()
1074	run_in(5, sequence(clr_ping_draw, status_draw))
1075	delta = int(mono_time() - t0)
1076	return '%d...' % (delta - delta%5)
1077	return '%.3f' % (t1 - t0)
1078
1079	def status_draw():
1080	row = scr_height - 1
1081	if row < 1:
1082	return
1083	if kbd_state is ks_esc:
1084	status = 'ESC-'
1085	elif kbd_state is ks_cx:
1086	status = 'C-x-'
1087	elif kbd_state in (ks_cseq, ks_cs_intermed):
1088	status = ' '.join(['CSI'] + list(str(kbd_accum[len(CSI):]))) + '-'
1089	elif cur_buf is buffers[0]:
1090	status = ''
1091	else:
1092	parent = buf_parent(cur_buf)
1093	network = buf_name(cur_buf if parent is None else parent)
1094	status = asciify(network)
1095	c = network_conns.get(network)
1096	if c:
1097	status = asciify(conn_nick(c) + '@') + status
1098	if parent:
1099	venue = buf_name(cur_buf)
1100	status += ' \| ' + asciify(venue)
1101	if c and conn_sock(c):
1102	if not conn_registered(c):
1103	status += ' \| unregistered'
1104	elif parent and is_chan(venue) and venue not in conn_channels(c):
1105	status += ' \| unjoined'
1106	status += ' \| ping: %s' % conn_ping_status(c)
1107	else:
1108	status += ' \| offline'
1109	write_out(t.cursor_pos(row, 1))
1110	write_out(t.ATTR_REVERSE)
1111	write_out(pad_or_clip_str(status, scr_width))
1112	write_out(t.ATTR_NONE)
1113	schedule_refresh()
1114	status_draw_done()
1115
1116	# buflist singleton: lists the open buffers in a left-hand pane
1117
1118	buflist = [0, BUFLIST_WIDTH_START, cur_buf, cur_buf, cur_buf]
1119	buflist_vscroll = lambda: buflist[0]
1120	buflist_width = lambda: buflist[1]
1121	buflist_cursor = lambda: buflist[2]
1122	buflist_last = lambda: buflist[3]
1123
1124	def buflist_set_width(w):
1125	schedule_redraw()
1126	if w > scr_width:
1127	w = scr_width - (scr_width - w) % BUFLIST_WIDTH_STEP
1128	buflist[1] = max(BUFLIST_WIDTH_MIN, w)
1129
1130	def buflist_set_cursor(b):
1131	schedule_buflist_draw()
1132	buflist[2] = b
1133
1134	def buflist_set_last(b):
1135	buflist[3] = b
1136
1137	def buflist_select(b):
1138	global cur_buf
1139	schedule_buflist_draw()
1140	if b is not cur_buf:
1141	schedule_buf_draw()
1142	schedule_status_draw()
1143	buflist_set_last(cur_buf)
1144	# Stop autoscrolling for newly selected window, to be resumed by buf_draw if it turns out the last line is still on screen
1145	buf_clr_at_end(b)
1146	buflist_set_cursor(b)
1147	cur_buf = b
1148
1149	command('buflist-switch-next')(
1150	lambda: buflist_select(
1151	get_clipped(buffers, find_buf(cur_buf) + 1)))
1152	command('buflist-switch-prev')(
1153	lambda: buflist_select(
1154	get_clipped(buffers, find_buf(cur_buf) - 1)))
1155	command('buflist-last-selected')(lambda: buflist_select(buflist_last()))
1156
1157	command('buflist-next')(
1158	lambda: buflist_set_cursor(
1159	get_clipped(buffers, find_buf(buflist_cursor()) + 1)))
1160	command('buflist-prev')(
1161	lambda: buflist_set_cursor(
1162	get_clipped(buffers, find_buf(buflist_cursor()) - 1)))
1163	command('buflist-top')(lambda: buflist_set_cursor(buffers[0]))
1164	command('buflist-bottom')(lambda: buflist_set_cursor(buffers[-1]))
1165	command('buflist-shrink')(lambda:
1166	buflist_set_width(buflist_width() - BUFLIST_WIDTH_STEP))
1167	command('buflist-grow')(lambda:
1168	buflist_set_width(buflist_width() + BUFLIST_WIDTH_STEP))
1169
1170	@command('buflist-submit')
1171	def buflist_submit():
1172	buflist_exit()
1173	buflist_select(buflist_cursor())
1174
1175	def buflist_draw():
1176	schedule_refresh()
1177	top_row = 2
1178	h = scr_height - 3
1179	w = min(scr_width, buflist_width() - 1)
1180	cursor = buflist_cursor()
1181	def network_status(network):
1182	c = network_conns.get(network)
1183	if c is None: # not connected
1184	return ' '
1185	sock = conn_sock(c)
1186	if sock is None: # down, awaiting reconnection
1187	return '~'
1188	fd = conn_sock(c).fileno()
1189	if fd in opening_conns: # DNS / TCP handshake
1190	return '~'
1191	if conn_registered(c):
1192	return '='
1193	else: # TCP connected but unregistered (no WELCOME yet)
1194	return '-'
1195	def get_label(buf):
1196	parts = []
1197	if buf is cur_buf:
1198	parts.append('*')
1199	elif buf is buflist_last():
1200	parts.append('-')
1201	else:
1202	parts.append(' ')
1203	if buf_parent(buf) is None:
1204	if buf is buffers[0]:
1205	parts.append(' ')
1206	else:
1207	parts.append(network_status(buf_name(buf)))
1208	else: # channel/pm
1209	parts.append(' ')
1210	parts.append(asciify(buf_name(buf)))
1211	unread = buf_unread(buf)
1212	if unread > 0:
1213	parts.append(' +%d' % unread)
1214	label = ''.join(parts)
1215	if buf is cursor and buflist_flag():
1216	return t.render((t.A_REVERSE, pad_or_clip_str(label, w)))
1217	else:
1218	return clip_str(label, w)
1219	write_out(t.cursor_pos(2, 1))
1220	scroll = buflist_vscroll()
1221	for row in range(h):
1222	write_out(t.cursor_pos(top_row + row, w) + t.ERASE_LINE_FROM_START)
1223	i = scroll + row
1224	if i < len(buffers):
1225	write_out(CR + get_label(buffers[i]))
1226	buflist_draw_done()
1227
1228	def buflist_vline_draw():
1229	top_row = 2
1230	height = scr_height - 3
1231	column = buflist_width()
1232	if column > scr_width:
1233	return
1234	move_down = LF if column == scr_width else BS + LF
1235	write_out(t.cursor_pos(top_row, column))
1236	write_out(SO)
1237	write_out(move_down.join(t.SGC_VBAR*height))
1238	write_out(SI)
1239
1240	command('prompt-enter')(sequence(schedule_refresh, prompt_enter))
1241	command('prompt-exit')(sequence(schedule_refresh, prompt_exit))
1242	command('buflist-enter')(sequence(schedule_buflist_draw, buflist_enter))
1243	command('redraw')(schedule_redraw)
1244
1245	# Terminal input state machine
1246
1247	# Only valid control sequences per ECMA-48 5ed. sec. 5.4 are accepted.
1248	# Esc always cancels any sequence in progress and moves to ks_esc, to avoid
1249	# control sequences leaking through as text input. C-g always cancels and
1250	# returns to ks_start.
1251
1252	kbd_accum = bytearray()
1253	kaccum = kbd_accum.extend
1254
1255	def kaccept(sym=''):
1256	kaccum(sym)
1257	seq = str(kbd_accum)
1258	ktrans(ks_start)
1259	def try_keymap(km):
1260	cmd = km.get(seq)
1261	if cmd is None:
1262	return False
1263	run_command(cmd)
1264	return True
1265	try:
1266	if try_keymap(GLOBAL_KEYS):
1267	return
1268	elif buflist_flag():
1269	try_keymap(BUFLIST_KEYS)
1270	elif prompt_flag():
1271	# Prompt has the focus. A bit of an awkward special case: any editing action other than yank-next needs to reset yank state, if any. Rather than littering every command handler with exit_yank calls, we peek inside the box here at the common ancestor.
1272	cmd = PROMPT_KEYS.get(seq)
1273	if cmd is None:
1274	if len(seq) == 1 and not is_ctrl(seq):
1275	exit_yank()
1276	prompt_insert(seq)
1277	else:
1278	if cmd not in YANK_SAFE_COMMANDS:
1279	exit_yank()
1280	run_command(cmd)
1281	else:
1282	try_keymap(BUF_KEYS)
1283	except CommandError, e:
1284	error(e, cur_buf)
1285
1286	def ktrans(state):
1287	global kbd_state
1288	kbd_state = state
1289	schedule_status_draw()
1290	if state in (ks_start, ks_esc):
1291	del kbd_accum[:]
1292	elif state is ks_cseq:
1293	del kbd_accum[:]
1294	kaccum(CSI)
1295
1296	# States
1297
1298	def ks_start(sym):
1299	if sym == C_X:
1300	kaccum(C_X)
1301	ktrans(ks_cx)
1302	elif sym == ESC:
1303	ktrans(ks_esc)
1304	else:
1305	kaccept(sym)
1306
1307	def ks_cx(sym):
1308	if sym == C_G:
1309	ktrans(ks_start)
1310	elif sym == ESC:
1311	ktrans(ks_esc)
1312	else:
1313	kaccept(casemap_ascii(ctrl(sym)) if is_ctrl(sym) else sym)
1314
1315	def ks_esc(sym):
1316	if sym == C_G:
1317	ktrans(ks_start)
1318	elif sym == ESC:
1319	pass
1320	elif sym == '[':
1321	ktrans(ks_cseq)
1322	else:
1323	kaccept(meta(sym))
1324
1325	def ks_cseq(sym):
1326	if sym == ESC:
1327	ktrans(ks_esc)
1328	elif '\x20' <= sym <= '\x2F':
1329	kaccum(sym)
1330	ktrans(ks_cs_intermed)
1331	elif '\x30' <= sym <= '\x3F':
1332	kaccum(sym)
1333	schedule_status_draw()
1334	elif '\x40' <= sym <= '\x7E':
1335	kaccept(sym)
1336	else:
1337	ktrans(ks_start)
1338
1339	def ks_cs_intermed(sym):
1340	if sym == ESC:
1341	ktrans(ks_esc)
1342	elif '\x20' <= sym <= '\x2F':
1343	kaccum(sym)
1344	schedule_status_draw()
1345	elif '\x40' <= sym <= '\x7E':
1346	kaccept(sym)
1347	else:
1348	ktrans(ks_start)
1349
1350	kbd_state = ks_start
1351
1352	def buf_conn(buf):
1353	if buf is buffers[0]:
1354	raise CommandError('this window not associated with a network')
1355	parent = buf_parent(buf)
1356	network = buf_name(buf if parent is None else parent)
1357	try:
1358	return network_conns[network]
1359	except KeyError:
1360	raise CommandError('not connected to %s' % network)
1361
1362	def buf_registered_conn(buf):
1363	c = buf_conn(buf)
1364	if conn_sock(c) is None:
1365	raise CommandError('connection to %s is down' % conn_network(c))
1366	if not conn_registered(c):
1367	raise CommandError('connection to %s not registered' % conn_network(c))
1368	return c
1369
1370	@command('connect', 1, 4)
1371	def connect_cmd(*args):
1372	net = args[0]
1373	if net in network_conns:
1374	raise CommandError('connect: connection already active for %s' % net)
1375
1376	if not safe_filename(net):
1377	raise CommandError('connect: bad network name: %s' % net)
1378	conf_paths = (('nets', net), ())
1379
1380	if len(args) > 1:
1381	addrs = [args[1]]
1382	else:
1383	addrs = config_lines(get_config('addrs', conf_paths))
1384	if addrs is None:
1385	raise CommandError('connect: no addrs for network %s' % net)
1386	try:
1387	addrs = map(parse_address, addrs)
1388	except ValueError, e:
1389	raise CommandError('connect: %s' % e)
1390
1391	if len(args) > 2:
1392	nick = args[2]
1393	else:
1394	nick = get_config('nick', conf_paths)
1395	if nick is None:
1396	raise CommandError('connect: no nick for %s' % net)
1397	if not valid_nick(nick):
1398	raise CommandError('connect: bad nick: %s' % nick)
1399
1400	if len(args) > 3:
1401	pw = args[3]
1402	else:
1403	pw = get_config('pass', conf_paths)
1404	if not valid_password(pw):
1405	raise CommandError(
1406	'connect: illegal character in password for %s' % net)
1407
1408	conn_start(new_conn(net, addrs, nick, pw))
1409
1410	@command('disconnect', 0, 1)
1411	def disconnect_cmd(net=None):
1412	if net is None:
1413	c = buf_conn(cur_buf)
1414	net = conn_network(c)
1415	else:
1416	try:
1417	c = network_conns[net]
1418	except KeyError:
1419	raise CommandError('no connection for network %s' % net)
1420	del network_conns[net]
1421	conn_info(c, 'disconnected')
1422	conn_close(c)
1423
1424	@command('join', 1, 2)
1425	def join_cmd(chan, key=None):
1426	if not valid_chan(chan):
1427	raise CommandError('join: bad channel name: %s' % chan)
1428	conn_join(buf_registered_conn(cur_buf), chan, key)
1429
1430	@command('kick', 1, extended_arg=True)
1431	def kick_cmd(user, msg=''):
1432	chan = buf_name(cur_buf)
1433	if buf_parent(cur_buf) is None or not is_chan(chan):
1434	raise CommandError('kick: this window not a channel')
1435	conn_send(buf_registered_conn(cur_buf), 'KICK', [chan, user, msg])
1436
1437	@command('list', 0, 1)
1438	def list_cmd(*args):
1439	conn_send(buf_registered_conn(cur_buf), 'LIST', args)
1440
1441	@command('me', extended_arg=True)
1442	def me_cmd(msg=''):
1443	buf_privmsg(cur_buf, '\x01ACTION %s\x01' % msg)
1444
1445	@command('mode', 1, 3)
1446	def mode_cmd(*args):
1447	conn_send(buf_registered_conn(cur_buf), 'MODE', args)
1448
1449	@command('msg', 1, extended_arg=True)
1450	def msg_cmd(target, msg=None):
1451	c = buf_registered_conn(cur_buf)
1452	if is_chan(target) and not valid_chan(target):
1453	raise CommandError('msg: bad channel name: %s' % target)
1454	if msg:
1455	conn_privmsg(c, target, msg)
1456	buflist_select(get_buf(target, conn_network(c)))
1457
1458	@command('names', 0, 1)
1459	def names_cmd(*args):
1460	conn_send(buf_registered_conn(cur_buf), 'NAMES', args)
1461
1462	@command('nick', 1)
1463	def nick_cmd(nick):
1464	c = buf_conn(cur_buf)
1465	if conn_sock(c) is None:
1466	schedule_status_draw()
1467	conn_set_nick(c, nick)
1468	conn_info(c, 'nick changed to %s for next reconnection' % nick)
1469	else:
1470	if not conn_registered(c):
1471	schedule_status_draw()
1472	conn_set_nick(c, nick)
1473	conn_info(c, 'nick changed to %s' % nick)
1474	conn_set_ping_ts(c, mono_time())
1475	conn_run_in(c, PING_TIMEOUT, conn_reg_timeout)
1476	conn_send(c, 'NICK', [nick])
1477
1478	@command('part', extended_arg=True)
1479	def part_cmd(msg=''):
1480	chan = buf_name(cur_buf)
1481	if buf_parent(cur_buf) is None or not is_chan(chan):
1482	raise CommandError('part: this window not a channel')
1483	conn_send(buf_registered_conn(cur_buf), 'PART', [chan, msg])
1484
1485	@command('quit', extended_arg=True)
1486	def quit_cmd(*msg):
1487	schedule_quit()
1488	for c in open_conns.itervalues():
1489	conn_send(c, 'QUIT', msg)
1490
1491	@command('send', extended_arg=True)
1492	def send_cmd(line):
1493	if len(line) > MAX_MSG_LEN:
1494	raise CommandError('send: line too long')
1495	conn_write(buf_registered_conn(cur_buf), line)
1496
1497	@command('topic', 0, 1)
1498	def topic_cmd(chan=None):
1499	if chan is None:
1500	chan = buf_name(cur_buf)
1501	if buf_parent(cur_buf) is None or not is_chan(chan):
1502	raise CommandError(
1503	'topic: this window not a channel and none specified')
1504	conn_send(buf_registered_conn(cur_buf), 'TOPIC', [chan])
1505
1506	@command('set-topic', extended_arg=True)
1507	def set_topic_cmd(topic=''):
1508	chan = buf_name(cur_buf)
1509	if buf_parent(cur_buf) is None or not is_chan(chan):
1510	raise CommandError('set-topic: this window not a channel')
1511	conn_send(buf_registered_conn(cur_buf), 'TOPIC', [chan, topic])
1512
1513	@command('whois', 1)
1514	def whois_cmd(nick):
1515	conn_send(buf_registered_conn(cur_buf), 'WHOIS', [nick])
1516
1517	@command('whowas', 1)
1518	def whowas_cmd(nick):
1519	conn_send(buf_registered_conn(cur_buf), 'WHOWAS', [nick])
1520
1521	@command('close')
1522	def close_cmd():
1523	parent = buf_parent(cur_buf)
1524	if parent is None:
1525	raise CommandError(
1526	"close: won't close a top-level window (try close-net)")
1527	venue = buf_name(cur_buf)
1528	try:
1529	c = buf_registered_conn(cur_buf)
1530	except CommandError:
1531	pass
1532	else:
1533	if venue in conn_channels(c):
1534	conn_send(c, 'PART', [venue, ''])
1535	del conn_channels(c)[venue]
1536	close_buf(cur_buf)
1537
1538	@command('close-net')
1539	def close_net_cmd():
1540	raise CommandError('stub') # TODO
1541
1542	def place_cursor():
1543	if buflist_flag():
1544	write_out(t.cursor_pos(
1545	max(1, scr_height - 2),
1546	clip(1, scr_width, buflist_width() - 1)))
1547	elif prompt_flag():
1548	write_out(t.cursor_pos(scr_height, prompt_cursor_column()))
1549	else:
1550	write_out(t.cursor_pos(max(1, scr_height - 2), max(1, scr_width)))
1551
1552	def refresh_if_needed():
1553	if redraw_flag():
1554	write_out(t.ERASE_FULL)
1555	buf_draw(cur_buf)
1556	buflist_vline_draw()
1557	buflist_draw()
1558	status_draw()
1559	prompt_draw()
1560	redraw_done()
1561	else:
1562	if buf_draw_flag():
1563	buf_draw(cur_buf)
1564	if buflist_draw_flag():
1565	buflist_draw()
1566	if status_draw_flag():
1567	status_draw()
1568	if prompt_draw_flag():
1569	prompt_draw()
1570	if refresh_flag():
1571	place_cursor()
1572	flush_out()
1573	refresh_done()
1574
1575	#
1576	# IRC stuff
1577	#
1578
1579	RPL_WELCOME = 1
1580	RPL_NOTOPIC = 331
1581	RPL_TOPIC = 332
1582	RPL_NAMREPLY = 353
1583	RPL_ENDOFNAMES = 366
1584	ERR_NICKNAMEINUSE = 433
1585	ERR_NICKCOLLISION = 436
1586	ERR_NOTREGISTERED = 451
1587
1588	MAX_MSG_LEN = 510
1589	MAX_CHAN_LEN = 50
1590	MAX_NICK_LEN = 31
1591
1592	IRC_ILLEGAL = NUL + CR + LF
1593	CHAN_ILLEGAL = IRC_ILLEGAL + BEL + ' ,:'
1594	CHAN_START = '&#+!'
1595	IRC_SPECIAL = '[]\\`_^{\|}'
1596
1597	LETTER = char_range('AZ') + char_range('az')
1598	DIGIT = char_range('09')
1599	NICK_START = LETTER + IRC_SPECIAL
1600	NICK_BODY = NICK_START + DIGIT + '-'
1601
1602	class ProtocolError(Exception):
1603	pass
1604
1605	def build_msg(prefix, cmd, params):
1606	"""Build an IRC wire message.
1607
1608	Conditions caller must enforce:
1609	* No args may contain NUL, CR, or LF
1610	* Only last param may be empty, contain spaces, or start with :
1611	* Valid cmd
1612	* 15 parameters max
1613	"""
1614	parts = []
1615	if prefix is not None:
1616	parts.append(':' + prefix)
1617	parts.append(cmd)
1618	if len(params):
1619	parts.extend(params[:-1])
1620	parts.append(':' + params[-1])
1621	return ' '.join(parts)
1622
1623	def max_param_len(cmd, prefix=None):
1624	# colon before prefix + space after prefix
1625	prefix_len = 0 if prefix is None else len(prefix) + 2
1626	# space after cmd + colon before last param
1627	return MAX_MSG_LEN - prefix_len - len(cmd) - 2
1628
1629	def parse_msg(msg):
1630	if any(c in msg for c in IRC_ILLEGAL):
1631	raise ProtocolError('illegal character in message')
1632	start = 0
1633	end = len(msg)
1634	def next_word():
1635	cut = msg.find(' ', start)
1636	if cut == -1:
1637	cut = end
1638	return cut + 1, msg[start:cut]
1639	if msg.startswith(':'):
1640	start = 1
1641	start, prefix = next_word()
1642	else:
1643	prefix = None
1644	start, cmd = next_word()
1645	if not cmd:
1646	raise ProtocolError('message with no command')
1647	params = []
1648	while start < end:
1649	if msg[start] == ':':
1650	params.append(msg[start+1:])
1651	break
1652	start, param = next_word()
1653	params.append(param)
1654	return prefix, casemap_ascii(cmd), params
1655
1656	is_chan = lambda n: len(n) > 0 and n[0] in CHAN_START
1657
1658	def valid_chan(n):
1659	return is_chan(n) and len(n) <= MAX_CHAN_LEN \
1660	and not any(c in CHAN_ILLEGAL for c in n)
1661
1662	def valid_nick(n):
1663	return 0 < len(n) <= MAX_NICK_LEN \
1664	and n[0] in NICK_START \
1665	and all(c in NICK_BODY for c in n[1:])
1666
1667	def valid_password(p):
1668	return p is None or (
1669	len(p) <= max_param_len('PASS')
1670	and not any(c in IRC_ILLEGAL for c in p))
1671
1672	sender_nick = lambda s: s.split('!', 1)[0]
1673
1674	#
1675	# Networking / main loop
1676	#
1677
1678	set_nonblock = lambda fd: fcntl(fd, F_SETFL, fcntl(fd, F_GETFL) \| O_NONBLOCK)
1679
1680	def read_all(fd):
1681	chunks = []
1682	try:
1683	chunk = read(fd, 4096)
1684	if not chunk:
1685	raise EOFError
1686	while chunk:
1687	chunks.append(chunk)
1688	chunk = read(fd, 4096)
1689	except EnvironmentError, e:
1690	if e.errno not in (EAGAIN, EWOULDBLOCK):
1691	raise
1692	return ''.join(chunks)
1693
1694	def new_conn(network, addrs, nick, password=None):
1695	i = rand_int(len(addrs))
1696	addrs = addrs[i:] + addrs[:i]
1697	return [network, None, '', '', addrs, nick, password, False, dict(),
1698	IRC_CASEMAP['rfc1459'], RECONN_DELAY_MIN, 0, 0, 0]
1699
1700	conn_network = lambda c: c[0]
1701	conn_sock = lambda c: c[1]
1702	conn_rdbuf = lambda c: c[2]
1703	conn_wrbuf = lambda c: c[3]
1704	conn_addrs = lambda c: c[4]
1705	conn_nick = lambda c: c[5]
1706	conn_password = lambda c: c[6]
1707	conn_registered = lambda c: c[7]
1708	conn_channels = lambda c: c[8]
1709	conn_casemap = lambda c, s: c[9](s)
1710	conn_count = lambda c: c[11]
1711	conn_ping_ts = lambda c: c[12]
1712	conn_pong_ts = lambda c: c[13]
1713
1714	conn_set_sock = lambda c, s: c.__setitem__(1, s)
1715	conn_rdbuf_add = lambda c, b: c.__setitem__(2, c[2] + b)
1716	conn_rdbuf_rm = lambda c, n: c.__setitem__(2, c[2][n:])
1717	conn_wrbuf_add = lambda c, b: c.__setitem__(3, c[3] + b)
1718	conn_wrbuf_rm = lambda c, n: c.__setitem__(3, c[3][n:])
1719	conn_set_nick = lambda c, n: c.__setitem__(5, n)
1720	conn_set_registered = lambda c: c.__setitem__(7, True)
1721	conn_clr_registered = lambda c: c.__setitem__(7, False)
1722	conn_reset_reconn_delay = lambda c: c.__setitem__(10, RECONN_DELAY_MIN)
1723	conn_set_count = lambda c, n: c.__setitem__(11, n)
1724	conn_set_ping_ts = lambda c, t: c.__setitem__(12, t)
1725	conn_set_pong_ts = lambda c, t: c.__setitem__(13, t)
1726
1727	def conn_reconn_delay(c):
1728	# limited exponential backoff
1729	d = c[10]
1730	c[10] = min(2*d, RECONN_DELAY_MAX)
1731	return d
1732
1733	conn_nick_lc = lambda c: conn_casemap(c, conn_nick(c))
1734
1735	def conn_run_in(c, delay, method, run_if_down=False):
1736	count = conn_count(c)
1737	def run():
1738	# Drop leftover tasks from old connections
1739	if c is network_conns.get(conn_network(c)) and conn_count(c) == count \
1740	and (run_if_down or conn_sock(c) is not None):
1741	method(c)
1742	run_in(delay, run)
1743
1744	def conn_log_msg(c, venue, m):
1745	network = conn_network(c)
1746	if venue is None:
1747	buf = get_buf(network, None)
1748	else:
1749	buf = get_buf(venue, network)
1750	buf_log_msg(buf, m)
1751	file_log_msg(network, venue, m)
1752
1753	def conn_info(c, msg):
1754	conn_log_msg(c, None, m_client(msg))
1755
1756	def conn_error(c, msg):
1757	conn_log_msg(c, None, m_client('ERROR: ' + msg))
1758
1759	opening_conns = {}
1760	network_conns = {}
1761	def conn_start(c):
1762	schedule_buflist_draw()
1763	schedule_status_draw()
1764	net = conn_network(c)
1765	assert conn_sock(c) is None, 'socket exists when starting connection'
1766	sock = socket()
1767	set_nonblock(sock.fileno())
1768	conn_set_sock(c, sock)
1769	conn_set_count(c, conn_count(c) + 1)
1770	addrs = conn_addrs(c)
1771	addrs.append(addrs.pop(0))
1772	conn_info(c, 'connecting to %s' % format_address(addrs[0]))
1773	network_conns[net] = opening_conns[sock.fileno()] = c
1774	try:
1775	sock.connect(addrs[0]) # TODO async DNS
1776	except SockError, e:
1777	if e.errno != EINPROGRESS:
1778	del opening_conns[sock.fileno()]
1779	conn_error(c, e.strerror)
1780	else:
1781	conn_handle_connected(c)
1782
1783	def conn_write(c, msg):
1784	if len(msg) > MAX_MSG_LEN:
1785	msg = msg[:MAX_MSG_LEN]
1786	conn_error(c, 'outbound message truncated')
1787	conn_wrbuf_add(c, msg + CRLF)
1788
1789	def conn_send(c, cmd, params, prefix=None):
1790	conn_write(c, build_msg(prefix, cmd, params))
1791
1792	open_conns = {}
1793	def conn_handle_connected(c):
1794	n = conn_nick(c)
1795	p = conn_password(c)
1796	s = conn_sock(c)
1797	e = s.getsockopt(SOL_SOCKET, SO_ERROR)
1798	if e == EINPROGRESS:
1799	return
1800	schedule_buflist_draw()
1801	schedule_status_draw()
1802	del opening_conns[s.fileno()]
1803	if e != 0:
1804	conn_error(c, strerror(e))
1805	conn_close(c)
1806	return
1807	conn_reset_reconn_delay(c)
1808	open_conns[s.fileno()] = c
1809	conn_info(c, 'connection established')
1810	conn_set_ping_ts(c, mono_time())
1811	conn_run_in(c, PING_TIMEOUT, conn_reg_timeout)
1812	if p is not None:
1813	conn_send(c, 'PASS', [p])
1814	conn_send(c, 'NICK', [n])
1815	conn_send(c, 'USER', [n, '0', '*', n])
1816
1817	def conn_close(c):
1818	sock = conn_sock(c)
1819	if sock is None:
1820	return
1821	schedule_buflist_draw()
1822	schedule_status_draw()
1823	fd = sock.fileno()
1824	if fd in open_conns:
1825	del open_conns[fd]
1826	elif fd in opening_conns:
1827	del opening_conns[fd]
1828	try:
1829	sock.shutdown(SHUT_RDWR)
1830	except SockError:
1831	pass
1832	sock.close()
1833	conn_set_sock(c, None)
1834	conn_rdbuf_rm(c, len(conn_rdbuf(c)))
1835	conn_wrbuf_rm(c, len(conn_wrbuf(c)))
1836	conn_clr_registered(c)
1837	conn_info(c, 'connection closed')
1838	if conn_network(c) in network_conns:
1839	delay = conn_reconn_delay(c)
1840	conn_run_in(c, delay, conn_start, True)
1841	conn_info(c, 'reconnecting in %d seconds' % delay)
1842
1843	def conn_handle_data(c, data):
1844	conn_rdbuf_add(c, data)
1845	data = conn_rdbuf(c)
1846	start = 0
1847	while start < len(data):
1848	end = data.find(CRLF, start)
1849	if end == -1:
1850	if len(data) - start >= MAX_MSG_LEN:
1851	conn_error(c, 'received oversize message')
1852	conn_close(c)
1853	return
1854	break
1855	if end > start:
1856	try:
1857	conn_handle_msg(c, data[start:end])
1858	except ProtocolError, e:
1859	conn_error(c, e)
1860	start = end + 2
1861	conn_rdbuf_rm(c, start)
1862
1863	def conn_handle_msg(c, msg):
1864	#pylint: disable=unbalanced-tuple-unpacking,too-many-locals
1865	prefix, cmd, params = parse_msg(msg)
1866
1867	def welcome():
1868	if destination != conn_nick(c): # for pre-welcome nick change
1869	schedule_status_draw()
1870	conn_info(c, 'nick changed to %s' % destination)
1871	conn_set_nick(c, destination)
1872	conn_log_msg(c, None, m_server(prefix or '', ' '.join(params)))
1873	if not conn_registered(c):
1874	schedule_buflist_draw()
1875	conn_set_registered(c)
1876	pong()
1877	for chan in conn_channels(c):
1878	conn_join(c, chan)
1879	conn_channels(c).clear()
1880
1881	def names_reply():
1882	if len(params) != 3:
1883	conn_error(c, 'RPL_NAMREPLY with bad parameter count: %s' % msg)
1884	return
1885	_, chan, names = params
1886	chan_lc = conn_casemap(c, chan)
1887	members = conn_channels(c).get(chan_lc)
1888	conn_log_msg(c, None if members is None else chan_lc,
1889	m_names(prefix or '', chan, names))
1890	if members is not None:
1891	for nick in names.split(' '):
1892	if not nick:
1893	conn_error(c, 'RPL_NAMREPLY with empty nick')
1894	break
1895	if nick[0] in '@+':
1896	nick = nick[1:]
1897	members.add(conn_casemap(c, nick))
1898
1899	def end_names():
1900	if len(params) != 2:
1901	conn_error(c, 'RPL_ENDOFNAMES with bad parameter count: %s' % msg)
1902	return
1903	chan = params[0]
1904	chan_lc = conn_casemap(c, chan)
1905	conn_log_msg(c, chan_lc if chan_lc in conn_channels(c) else None,
1906	m_endnames(prefix or '', chan))
1907
1908	def error_msg():
1909	if len(params) != 1:
1910	conn_error(c, 'ERROR with bad parameter count: %s' % msg)
1911	return
1912	conn_log_msg(c, None, m_error(prefix or '', params[0]))
1913
1914	def ping():
1915	conn_send(c, 'PONG', params)
1916
1917	def pong():
1918	schedule_status_draw()
1919	conn_set_pong_ts(c, mono_time())
1920	conn_run_in(c, PING_INTERVAL, conn_ping)
1921
1922	def privmsg():
1923	if len(params) != 2:
1924	conn_error(c, 'message with bad parameter count: %s' % msg)
1925	return
1926	target, content = params
1927	target_lc = conn_casemap(c, target)
1928	if prefix is None:
1929	conn_error(c, 'message without sender: %s' % msg)
1930	return
1931	sender = sender_nick(prefix)
1932	if target_lc == conn_nick_lc(c): # PM
1933	venue = conn_casemap(c, sender)
1934	elif valid_chan(target_lc):
1935	if target_lc in conn_channels(c):
1936	venue = target_lc
1937	else:
1938	return # drop messages to unknown channels
1939	elif target_lc == '*': # not sure if standard but freenode does this
1940	venue = None
1941	else:
1942	conn_error(c, 'message to unknown target: %s' % msg)
1943	return
1944	conn_log_msg(c, venue,
1945	(m_notice if cmd == 'notice' else m_privmsg)(sender, content))
1946
1947	def join():
1948	if len(params) != 1:
1949	conn_error(c, 'JOIN with bad parameter count: %s' % msg)
1950	return
1951	chan, = params
1952	chan_lc = conn_casemap(c, chan)
1953	if prefix is None:
1954	conn_error(c, 'JOIN without sender: %s' % msg)
1955	return
1956	sender_lc = conn_casemap(c, sender_nick(prefix))
1957	channels_dict = conn_channels(c)
1958	if sender_lc == conn_nick_lc(c):
1959	if chan_lc in channels_dict:
1960	conn_error(c, 'JOIN to already joined channel %s' % chan)
1961	return
1962	channels_dict[chan_lc] = set()
1963	else:
1964	if chan_lc not in channels_dict:
1965	conn_error(c, 'JOIN %s to unknown channel %s' % (prefix, chan))
1966	return
1967	channels_dict[chan_lc].add(sender_lc)
1968	conn_log_msg(c, chan_lc, m_join(prefix, chan))
1969
1970	def mode():
1971	if len(params) < 1:
1972	conn_error(c, 'MODE with bad parameter count: %s' % msg)
1973	return
1974	target = params[0]
1975	modes = ' '.join(params[1:])
1976	target_lc = conn_casemap(c, target)
1977	if prefix is None:
1978	conn_error(c, 'MODE without sender: %s' % msg)
1979	return
1980	if is_chan(target_lc):
1981	if target_lc not in conn_channels(c):
1982	conn_error(c, 'MODE to unknown channel: %s' % msg)
1983	return
1984	conn_log_msg(c, target_lc, m_chanmode(prefix, target, modes))
1985	else:
1986	if not target_lc == prefix == conn_nick(c):
1987	conn_error(c, 'MODE to unknown target: %s' % msg)
1988	return
1989	conn_log_msg(c, None, m_mode(prefix, modes))
1990
1991	def part():
1992	if len(params) == 1:
1993	comment = ''
1994	elif len(params) == 2:
1995	comment = params[1]
1996	else:
1997	conn_error(c, 'PART with bad parameter count: %s' % msg)
1998	return
1999	parted_chans = params[0].split(',')
2000	if prefix is None:
2001	conn_error(c, 'PART without sender: %s' % msg)
2002	return
2003	sender_lc = conn_casemap(c, sender_nick(prefix))
2004	channels_dict = conn_channels(c)
2005	me = (sender_lc == conn_nick_lc(c))
2006	for chan in parted_chans:
2007	chan_lc = conn_casemap(c, chan)
2008	if chan_lc not in channels_dict:
2009	# drop PARTs from unknown channels (e.g. closed window)
2010	continue
2011	try:
2012	if me:
2013	del channels_dict[chan_lc]
2014	conn_info(c, 'parted %s' % chan)
2015	schedule_status_draw()
2016	else:
2017	channels_dict[chan_lc].remove(sender_lc)
2018	except KeyError:
2019	conn_error(c, 'PART non-member %s from %s' % (prefix, chan))
2020	continue
2021	conn_log_msg(c, chan_lc, m_part(prefix, chan, comment))
2022
2023	def quit_msg():
2024	if len(params) != 1:
2025	conn_error(c, 'QUIT with bad parameter count: %s' % msg)
2026	return
2027	quit_msg, = params
2028	if prefix is None:
2029	conn_error(c, 'QUIT without sender [%s]' % quit_msg)
2030	return
2031	sender_lc = conn_casemap(c, sender_nick(prefix))
2032	for chan_lc, members in conn_channels(c).items():
2033	if sender_lc in members:
2034	conn_log_msg(c, chan_lc, m_quit(prefix, quit_msg))
2035	members.remove(sender_lc)
2036
2037	def kick():
2038	if len(params) < 2 or len(params) > 3:
2039	conn_error(c, 'KICK with bad parameter count: %s' % msg)
2040	return
2041	if prefix is None:
2042	conn_error(c, 'KICK without sender: %s' % msg)
2043	return
2044	chan = params[0]
2045	chan_lc = conn_casemap(c, chan)
2046	kicked_user = params[1]
2047	kicked_user_lc = conn_casemap(c, kicked_user)
2048	comment = params[2] if len(params) == 3 else ''
2049	channels_dict = conn_channels(c)
2050	if kicked_user_lc == conn_nick_lc(c):
2051	try:
2052	del channels_dict[chan_lc]
2053	except KeyError:
2054	conn_error(c, 'KICK from unknown channel %s by %s [%s]'
2055	% (chan, prefix, comment))
2056	return
2057	schedule_status_draw()
2058	conn_log_msg(c, chan_lc, m_kicked(prefix, chan, comment))
2059	else:
2060	if chan_lc not in channels_dict:
2061	conn_error(c, 'KICK %s from unknown channel %s by %s [%s]'
2062	% (kicked_user, chan, prefix, comment))
2063	return
2064	try:
2065	channels_dict[chan_lc].remove(kicked_user_lc)
2066	except KeyError:
2067	conn_error(c, 'KICK non-member %s from %s by %s [%s]'
2068	% (kicked_user, chan, prefix, comment))
2069	return
2070	conn_log_msg(c, chan_lc,
2071	m_kick(prefix, chan, kicked_user, comment))
2072
2073	def nick():
2074	if len(params) != 1:
2075	conn_error(c, 'NICK with bad parameter count: %s' % msg)
2076	return
2077	new_nick, = params
2078	if prefix is None:
2079	conn_error(c, 'NICK without sender: %s' % msg)
2080	return
2081	sender = sender_nick(prefix)
2082	new_nick_lc = conn_casemap(c, new_nick)
2083	sender_lc = conn_casemap(c, sender)
2084	if sender_lc == conn_nick_lc(c):
2085	conn_info(c, 'nick changed to %s' % new_nick)
2086	conn_set_nick(c, new_nick)
2087	schedule_status_draw()
2088	for chan_lc, members in conn_channels(c).items():
2089	if sender_lc in members:
2090	members.remove(sender_lc)
2091	members.add(new_nick_lc)
2092	conn_log_msg(c, chan_lc, m_nick(sender, new_nick))
2093
2094	def topic():
2095	if len(params) != 2:
2096	conn_error(c, '(RPL_(NO))TOPIC with bad parameter count: %s' % msg)
2097	chan = params[0]
2098	topic = None
2099	if cmd != str(RPL_NOTOPIC):
2100	topic = params[1]
2101	chan_lc = conn_casemap(c, chan)
2102	if chan_lc in conn_channels(c):
2103	buf_set_title(get_buf(chan_lc, conn_network(c)), topic or chan_lc)
2104	conn_log_msg(c, chan_lc, m_topic(prefix or '', topic))
2105	else:
2106	conn_log_msg(c, None, m_chantopic(prefix or '', chan, topic))
2107
2108	def unknown_command():
2109	conn_info(c, 'unknown command from server: %s' % msg)
2110
2111	def unknown_reply():
2112	conn_log_msg(c, None, m_server(prefix or '', ' '.join([cmd] + params)))
2113
2114	if len(cmd) == 3 and all(map(is_digit, cmd)):
2115	# Replies
2116	if not params:
2117	conn_error(c, 'reply %s with no destination' % cmd)
2118	return
2119	destination = params.pop(0)
2120	{
2121	RPL_WELCOME: welcome,
2122	RPL_NAMREPLY: names_reply,
2123	RPL_ENDOFNAMES: end_names,
2124	RPL_TOPIC: topic,
2125	RPL_NOTOPIC: topic,
2126	#ERR_NICKNAMEINUSE:
2127	#ERR_NICKCOLLISION:
2128	#ERR_NOTREGISTERED:
2129	}.get(int(cmd), unknown_reply)()
2130	else:
2131	{
2132	'error': error_msg,
2133	'ping': ping,
2134	'pong': pong,
2135	'privmsg': privmsg,
2136	'notice': privmsg,
2137	'join': join,
2138	'mode': mode,
2139	'part': part,
2140	'quit': quit_msg,
2141	'kick': kick,
2142	'nick': nick,
2143	'topic': topic,
2144	}.get(cmd, unknown_command)()
2145
2146	def conn_join(c, chan, key=None):
2147	conn_info(c, 'joining %s' % chan)
2148	conn_send(c, 'JOIN', [chan] if key is None else [chan, key])
2149
2150	def conn_privmsg(c, target, msg):
2151	# There is NO SANE WAY to deduce the max privmsg length, go figure.
2152	for line in wrap(msg, 400):
2153	conn_log_msg(c, target, m_privmsg(conn_nick(c), line))
2154	conn_send(c, 'PRIVMSG', [target, line])
2155
2156	def conn_ping(c):
2157	conn_set_ping_ts(c, mono_time())
2158	conn_send(c, 'PING', [conn_nick(c)])
2159	conn_run_in(c, PING_TIMEOUT, conn_timeout)
2160
2161	def conn_timeout(c):
2162	if mono_time() - conn_pong_ts(c) > PING_TIMEOUT:
2163	conn_error(c, 'ping timed out')
2164	conn_close(c)
2165
2166	def conn_reg_timeout(c):
2167	if mono_time() - max(conn_pong_ts(c), conn_ping_ts(c)) > PING_TIMEOUT:
2168	conn_error(c, 'registration timed out')
2169	conn_close(c)
2170
2171	# Log file message formatting is simpler than UI as the message type and
2172	# sender are always shown explicitly.
2173	arg2 = lambda a, b: b
2174	arg3 = lambda a, b, c: c
2175	empty2 = lambda a, b: ''
2176	def lterr(*_):
2177	raise TypeError('bad log message type')
2178
2179	format_log_msg = matcher(message, (
2180	(m_privmsg, arg2),
2181	(m_notice, arg2),
2182	(m_join, empty2),
2183	(m_part, arg3),
2184	(m_quit, arg2),
2185	(m_nick, arg2),
2186	(m_kick, lambda sender, chan, name, msg: name + ' ' + msg),
2187	(m_kicked, arg3),
2188	(m_topic, lambda sender, topic: topic or ''),
2189	(m_chantopic, lterr),
2190	(m_mode, lterr),
2191	(m_chanmode, arg3),
2192	(m_names, arg3),
2193	(m_endnames, empty2),
2194	(m_error, arg2),
2195	(m_client, lterr),
2196	(m_server, arg2)))
2197
2198	def file_log_msg(network, venue, m):
2199	if venue is None or len(venue) == 0:
2200	return
2201	path = ('logs', network, fs_encode(venue) + '.log')
2202	# Possible optimization: cache log FDs and check freshness by comparing
2203	# (dev, inode) with stat() on each write. Exceeding the max FDs rlimit
2204	# would need to be handled, e.g. by LRU eviction using a minheap with
2205	# global write counter.
2206	def open_log():
2207	return os_open('/'.join(path), O_WRONLY \| O_APPEND \| O_CREAT, 0666)
2208	try:
2209	try:
2210	fd = open_log()
2211	except EnvironmentError, e:
2212	if e.errno != ENOENT:
2213	raise
2214	try:
2215	mkdir(path[0])
2216	except EnvironmentError, e:
2217	if e.errno != EEXIST:
2218	raise
2219	mkdir('/'.join(path[:2]))
2220	fd = open_log()
2221	try:
2222	write_all(fd, ''.join((
2223	str(int(time()*100)),
2224	' ', variant_name(m),
2225	' <', variant_args(m)[0], '> ', format_log_msg(m), LF)))
2226	except EnvironmentError, e:
2227	error(e)
2228	close(fd)
2229	except EnvironmentError, e:
2230	error(e)
2231
2232	def handle_resize(*_):
2233	global scr_height, scr_width
2234	scr_height, scr_width = t.screen_size()
2235	# Re-clip scrolling as last line may now fit above viewport
2236	max_vsc = buf_max_vscroll(cur_buf)
2237	if buf_vscroll(cur_buf) > max_vsc:
2238	buf_set_vscroll(cur_buf, max_vsc)
2239	# Stop autoscrolling, to be resumed by buf_draw if it turns out the last line is still on screen
2240	buf_clr_at_end(cur_buf)
2241	schedule_redraw()
2242	# Wake main event loop
2243	try:
2244	write(self_pipe_wr, '\0')
2245	except EnvironmentError, e:
2246	if e.errno not in (EAGAIN, EWOULDBLOCK):
2247	raise
2248
2249	# Poor man's monotonic clock. Doesn't give real time, but at least avoids
2250	# overly delayed events if the clock is stepped backward.
2251	mono_last = mono_offset = 0
2252	def mono_time(time_=time):
2253	global mono_last, mono_offset
2254	now = time_() + mono_offset
2255	if now < mono_last:
2256	mono_offset += mono_last - now
2257	now = mono_last
2258	mono_last = now
2259	return now
2260
2261	schedule = []
2262	run_in = lambda seconds, thunk: heap_insert(schedule, mono_time() + seconds,
2263	thunk)
2264
2265	def main():
2266	yrc_home = getenv('HOME', '') + '/.yrc'
2267	try:
2268	chdir(yrc_home)
2269	except EnvironmentError:
2270	mkdir(yrc_home)
2271	chdir(yrc_home)
2272
2273	set_nonblock(self_pipe_rd)
2274	set_nonblock(self_pipe_wr)
2275	signal(SIGINT, SIG_DFL)
2276	signal(SIGWINCH, handle_resize)
2277	handle_resize()
2278
2279	info('Welcome to yrc: the Unix IRC client')
2280	info('Version: %s' % __version__)
2281	info("Documentation is included in the distribution: refer to README and manual.txt to get started, or NEWS for what's new in this release")
2282	info('Type /quit<Enter> to exit')
2283	prompt_enter()
2284
2285	while not quit_flag():
2286	refresh_if_needed()
2287	timeout = None
2288	if schedule:
2289	timeout = max(0, heap_peek(schedule)[0] - mono_time())
2290	try:
2291	readers, writers, _ = select(
2292	[STDIN, self_pipe_rd] + open_conns.keys(),
2293	opening_conns.keys() +
2294	[fd for fd, c in open_conns.items() if conn_wrbuf(c)],
2295	(), timeout)
2296	except SelectError, e:
2297	if e[0] == EINTR:
2298	continue
2299	raise
2300	for fd in readers:
2301	if fd == STDIN:
2302	try:
2303	data = read_all(fd)
2304	except (EOFError, EnvironmentError):
2305	schedule_quit()
2306	for c in data:
2307	kbd_state(c)
2308	elif fd == self_pipe_rd:
2309	read_all(self_pipe_rd)
2310	elif fd in open_conns:
2311	c = open_conns[fd]
2312	try:
2313	data = read_all(fd)
2314	except EOFError:
2315	conn_info(c, 'connection closed by server')
2316	conn_close(c)
2317	except EnvironmentError, e:
2318	conn_error(c, str(e))
2319	conn_close(c)
2320	else:
2321	conn_handle_data(c, data)
2322	for fd in writers:
2323	if fd in opening_conns:
2324	conn_handle_connected(opening_conns[fd])
2325	elif fd in open_conns:
2326	c = open_conns[fd]
2327	try:
2328	n = write(fd, conn_wrbuf(c))
2329	except EnvironmentError, e:
2330	if e.errno not in (EAGAIN, EWOULDBLOCK):
2331	conn_error(c, str(e))
2332	conn_close(c)
2333	else:
2334	conn_wrbuf_rm(c, n)
2335	while schedule and heap_peek(schedule)[0] < mono_time():
2336	heap_extract(schedule)[1]()
2337
2338	def crash_handler():
2339	cleanup = t.init(nonblock_read=True)
2340	try:
2341	main()
2342	finally:
2343	cleanup()
2344
2345	check_command_dicts((
2346	GLOBAL_KEYS,
2347	PROMPT_KEYS,
2348	BUFLIST_KEYS,
2349	BUF_KEYS,
2350	CMD_ABBREVS
2351	))