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Script: inotify.py

Notification script using libnotify or dbus with screen support. (for WeeChat ≥ 0.3.0, requires: inotify-daemon)
Author: m4v, version 0.1.4, GPL3 — added: 2010-02-25, updated: 2014-05-10
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# -*- coding: utf-8 -*-
###
# Copyright (c) 2009-2010 by Elián Hanisch <lambdae2@gmail.com>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.
###

###
# Notifications for WeeChat
#
#   Notification script that uses libnotify or dbus, supports WeeChat inside screen.
#   Uses a xmlrpc daemon that must be running in the receiving machine (remotely or locally)
#
#   The daemon can be setup in several ways, see inotify-daemon --help
#   Download it from 'http://github.com/m4v/inotify-daemon/raw/stable/inotify-daemon'
#
#   Commands:
#   * /inotify
#     See /help inotify
#
#   Settings:
#   * plugins.var.python.inotify.server_uri:
#   inotify-daemon address and port to connect, must be the same address the daemon is using.
#   By default it uses localhost and port 7766.
#
#       Examples:
#       http://www.your.home.com:7766
#       http://localhost:7766
#
#   * plugins.var.python.inotify.server_method:
#   Notification method supported by the daemon to use. Defaults to 'libnotify'.
#   See below for detailed help about them.
#
#   * plugins.var.python.inotify.color_nick:
#   Will use coloured nicks in notifications.
#
#   * plugins.var.python.inotify.ignore_channel:
#   Comma separated list of patterns for define ignores. Notifications from channels where its name
#   matches any of these patterns will be ignored.
#   Wildcards '*', '?' and char groups [..] can be used.
#   An ignore exception can be added by prefixing '!' in the pattern.
#
#       Example:
#       *ubuntu*,!#ubuntu-offtopic
#       any notifications from a 'ubuntu' channel will be ignored, except from #ubuntu-offtopic
#
#   * plugins.var.python.inotify.ignore_nick:
#   Same as ignore_channel, but for nicknames.
#
#       Example:
#       troll,b[0o]t
#       will ignore notifications from troll, bot and b0t
#
#   * plugins.var.python.inotify.ignore_text:
#   Same as ignore_channel, but for the contents of the message.
#
#   * plugins.var.python.inotify.passwd:
#   In the case the daemon is using a password for verify that incoming notifications are trusted.
#   If this password doesn't match with the password setup in inotify-daemon notification will not
#   succeed.
#
#
#   Notify methods:
#   * libnotify:
#   Use libnotify for notifications, needs python-notify installed in the machine running the
#   daemon. This is the default method.
#
#   * dbus:
#   Uses dbus directly for notifications, this is KDE4 specific, might not work in other desktops.
#   Needs python-dbus in the machine running the daemon.
#
#   * any:
#   Use daemon's configured method, this is usually libnotify.
#
#
#   TODO
#   add commands for configure ignores
#   add more notifications methods (?)
#
#
#   History:
#   2014-05-10, Sébastien Helleu <flashcode@flashtux.org>
#   version 0.1.4: change hook_print callback argument type of
#                  displayed/highlight (WeeChat >= 1.0)
#   2011-11-02, Sebastien Helleu <flashcode@flashtux.org>:
#   version 0.1.3: use local variable "channel" in buffer instead of reading "short_name",
#                  fix command for hook_process (remove line break before "-c")
#
#   2011-03-11, Sebastien Helleu <flashcode@flashtux.org>:
#   version 0.1.2: get python 2.x binary for hook_process (fix problem when
#                  python 3.x is default python version)
#   2010-03-10:
#   version 0.1.1: fixes
#   * improved shell escapes when using hook_process
#   * fix ACTION messages
#
#   2010-02-24
#   version 0.1: release!
#
###

SCRIPT_NAME    = "inotify"
SCRIPT_AUTHOR  = "Elián Hanisch <lambdae2@gmail.com>"
SCRIPT_VERSION = "0.1.4"
SCRIPT_LICENSE = "GPL3"
SCRIPT_DESC    = "Notifications for WeeChat."
SCRIPT_COMMAND = "inotify"

DAEMON_URL = 'http://github.com/m4v/inotify-daemon/raw/stable/inotify-daemon'
DAEMON     = 'inotify-daemon'
DAEMON_VERSION = '0.2'

### Default Settings ###
settings = {
'server_uri'     : 'http://localhost:7766',
'server_method'  : 'any',
'color_nick'     : 'on',
'ignore_channel' : '',
'ignore_nick'    : '',
'ignore_text'    : '',
'passwd'         : '',
}

max_error_count = 3

try:
    import weechat
    WEECHAT_RC_OK = weechat.WEECHAT_RC_OK
    import_ok = True
except:
    print "This script must be run under WeeChat."
    print "Get WeeChat now at: http://www.weechat.org/"
    import_ok = False

import xmlrpclib, socket
from fnmatch import fnmatch

# remote daemon timeout
socket.setdefaulttimeout(4)

### Messages ###
def debug(s, prefix=''):
    """Debug msg"""
    if not weechat.config_get_plugin('debug'): return
    buffer_name = 'DEBUG_' + SCRIPT_NAME
    buffer = weechat.buffer_search('python', buffer_name)
    if not buffer:
        buffer = weechat.buffer_new(buffer_name, '', '', '', '')
        weechat.buffer_set(buffer, 'nicklist', '0')
        weechat.buffer_set(buffer, 'time_for_each_line', '0')
        weechat.buffer_set(buffer, 'localvar_set_no_log', '1')
    weechat.prnt(buffer, '%s\t%s' %(prefix, s))

def error(s, prefix='', buffer='', trace=''):
    """Error msg"""
    if weechat.config_get_plugin('quiet'): return
    prefix = prefix or script_nick
    weechat.prnt(buffer, '%s%s %s' %(weechat.prefix('error'), prefix, s))
    if weechat.config_get_plugin('debug'):
        if not trace:
            import traceback
            if traceback.sys.exc_type:
                trace = traceback.format_exc()
        not trace or weechat.prnt('', trace)

def say(s, prefix='', buffer=''):
    """normal msg"""
    prefix = prefix or script_nick
    weechat.prnt(buffer, '%s\t%s' %(prefix, s))

### Config and value validation ###
boolDict = {'on':True, 'off':False}
def get_config_boolean(config):
    value = weechat.config_get_plugin(config)
    try:
        return boolDict[value]
    except KeyError:
        default = settings[config]
        error("Error while fetching config '%s'. Using default value '%s'." %(config, default))
        error("'%s' is invalid, allowed: 'on', 'off'" %value)
        return boolDict[default]

def get_config_int(config, allow_empty_string=False):
    value = weechat.config_get_plugin(config)
    try:
        return int(value)
    except ValueError:
        if value == '' and allow_empty_string:
            return value
        default = settings[config]
        error("Error while fetching config '%s'. Using default value '%s'." %(config, default))
        error("'%s' is not a number." %value)
        return int(default)

valid_methods = set(('any', 'dbus', 'libnotify'))
def get_config_valid_string(config, valid_strings=valid_methods):
    value = weechat.config_get_plugin(config)
    if value not in valid_strings:
        default = settings[config]
        error("Error while fetching config '%s'. Using default value '%s'." %(config, default))
        error("'%s' is an invalid value, allowed: %s." %(value, ', '.join(valid_strings)))
        return default
    return value

### Class definitions ###
class Ignores(object):
    def __init__(self, ignore_type):
        self.ignore_type = ignore_type
        self.ignores = []
        self.exceptions = []
        self._get_ignores()

    def _get_ignores(self):
        assert self.ignore_type is not None
        ignores = weechat.config_get_plugin(self.ignore_type).split(',')
        ignores = [ s.lower() for s in ignores if s ]
        self.ignores = [ s for s in ignores if s[0] != '!' ]
        self.exceptions = [ s[1:] for s in ignores if s[0] == '!' ]

    def __contains__(self, s):
        s = s.lower()
        for p in self.ignores:
            if fnmatch(s, p):
                for e in self.exceptions:
                    if fnmatch(s, e):
                        return False
                return True
        return False


class Server(object):
    def catch_exceptions(f):
        """
        This decorator is for catch exceptions in methods that communicate with the daemon."""
        def protected_method(self, *args):
            try:
                return f(self, *args)
            except xmlrpclib.Fault, e:
                self._error("A fault occurred." %e, trace="Code: %s\nString: %s" %(e.faultCode, e.faultString))
            except xmlrpclib.ProtocolError, e:
                self._error("Protocol error: %s" %e, trace="Url: %s\nCode: %s\nHeaders: %s\nMessage: %s" %(e.url, e.errcode,
                    e.headers, e.errmsg))
            except socket.error, e:
                self._error_connect()
            except socket.timeout, e:
                self._error('Timeout while sending to our daemon.')
                if self.error_count < 3: # don't re-queue after 3 errors
                    return 'retry'
            except:
                # catch all exception
                self._error("An error occurred, but I'm not sure what could it be...")
        return protected_method

    def __init__(self):
        self._reset()
        self._create_server()
        if not self.error_count:
            self.send_rpc('Notification script loaded')

    def _reset(self):
        self.msg = {}
        self.timer = None

    def enqueue(self, msg, channel):
        self._enqueue(msg, channel)

    def _enqueue(self, msg, channel='', timeout=3000):
        if channel not in self.msg:
            self.msg[channel] = msg
        else:
            s = self.msg[channel]
            msg = '%s\n%s' %(s, msg)
            self.msg[channel] = msg
        if self.timer is None:
            self.timer = weechat.hook_timer(timeout, 0, 1, 'msg_flush', '')
            #debug('set timer: %s %s' %(self.timer, timeout))

    def flush(self):
        for channel, msg in self.msg.iteritems():
            if self.send_rpc(msg, channel) == 'retry':
                # daemon is restarting, try again later
                self._restart_timer()
                return
        if self.remote:
            #  we can't stop flushing if we're in remote mode, so save a copy as we might need
            #  to repeat the queue later
            self.msg_bak = self.msg.copy()
        self._reset()

    def _restart_timer(self):
        if self.timer is not None:
            #debug('reset and set timer')
            weechat.unhook(self.timer)
        self.timer = weechat.hook_timer(5000, 0, 1, 'msg_flush', '')

    @catch_exceptions
    def _create_server(self):
        self.error_count = 0
        self.method = get_config_valid_string('server_method')
        self.address = weechat.config_get_plugin('server_uri')
        # detect if we're going to connect to localhost.
        if self.address[:17] in ('http://localhost:', 'http://127.0.0.1:'):
            self.remote = False
        else:
            self.remote = True
            self.msg_bak = {}
        self.server = xmlrpclib.Server(self.address)
        version = self.server.version()
        if version != DAEMON_VERSION:
            error('Incorrect daemon version, should be %s, but got %s' %(DAEMON_VERSION,
                version))
            error('Download the latest %s from %s' %(DAEMON, DAEMON_URL))

    def _error(self, s, **kwargs):
        if self.error_count < max_error_count: # stop sending error msg after max reached
            error(s, **kwargs)
        elif self.error_count == max_error_count:
            error('Suppressing future error messages...')
        self.error_count += 1

    def _error_connect(self):
        self._error('Failed to connect to our notification daemon, check if the address'
               ' \'%s\' is correct and if it\'s running.' %self.address)

    @catch_exceptions
    def send_rpc(self, *args):
        debug('sending rpc: %s' %' '.join(map(repr, args)))
        passwd = weechat.config_get_plugin('passwd')
        if self.remote:
            return self._send_rpc_process(passwd, *args)
        rt = getattr(self.server, self.method)(passwd, *args)
        if rt == 'OK':
            self.error_count = 0 
            #debug('Success: %s' % rt)
        elif rt.startswith('warning:'):
            self._error(rt[8:])
            if self.error_count < 10: # don't re-queue after 10 errors
                #debug('repeating queue')
                # returning 'retry' will cause flush() to try to send msgs again later
                return 'retry'
        else:
            error(rt)

    def _send_rpc_process(self, *args):
        def quoted(s):
            """
            Is important to escape quotes properly so hook_process doesn't break or sends stuff
            outside single quotes."""
            if '\\' in s:
                # escape any backslashes
                s = s.replace('\\', '\\\\')
            if '"' in s:
                s = s.replace('"', '\\"')
            if "'" in s:
                # I must escape single quotes with \'\\\'\' because they will be within single
                # quotes in the command string. Awesome.
                s = s.replace("'", "'\\''")
            return  '"""%s"""' %s

        args = ', '.join(map(quoted, args))
        python2_bin = weechat.info_get('python2_bin', '') or 'python'
        cmd = python2_bin + rpc_process_cmd %{'server_uri':self.address, 'method':self.method, 'args':args}
        debug('\nRemote cmd:%s\n' %cmd)
        weechat.hook_process(cmd, 30000, 'rpc_process_cb', '')

    @catch_exceptions
    def quit(self):
        passwd = weechat.config_get_plugin('passwd')
        rt = self.server.quit(passwd)
        debug(rt)
        if rt != 'OK':
            error(rt)

    @catch_exceptions
    def restart(self):
        passwd = weechat.config_get_plugin('passwd')
        rt = self.server.restart(passwd)
        debug(rt)
        if rt != 'OK':
            error(rt)


### Functions ###
def msg_flush(*args):
    server.flush()
    return WEECHAT_RC_OK

# command MUST be within single quotes, otherwise the shell would try to expand stuff and it might
# be real nasty, somebody could run arbitrary code with a highlight.
rpc_process_cmd = """ -c '
import xmlrpclib
try:
    server = xmlrpclib.Server("%(server_uri)s")
    print getattr(server, "%(method)s")(%(args)s)
except Exception, e:
    print "error: %%s" %%e'
"""

def rpc_process_cb(data, command, rc, stdout, stderr):
    #debug("%s\nstderr: %s\nstdout: %s" %(rc, repr(stderr), repr(stdout)))
    if stdout:
        debug('Reply: %s' %stdout)
        if stdout == 'OK\n':
            server.error_count = 0
        elif stdout.startswith('warning:'):
            server._error(stdout[8:])
            if server.error_count < 10:
                server.msg = server.msg_bak
                server._restart_timer()
        else:
            server._error(stdout)
    if stderr:
        error(stderr)
    return WEECHAT_RC_OK

color_table = ('teal', 'darkmagenta', 'darkgreen', 'brown', 'blue', 'darkblue', 'darkcyan', 'magenta', 'green', 'grey')

def color_tag(nick):
    n = len(color_table)
    #generic_nick = nick.strip('_`').lower()
    id = (sum(map(ord, nick))%n)
    #debug('%s:%s' %(nick, id))
    return '<font color=%s>&lt;%s&gt;</font>' %(color_table[id], nick)

def format(s, nick=''):
    if '<' in s:
        s = s.replace('<', '&lt;')
    if '>' in s:
        s = s.replace('>', '&gt;')
    if '"' in s:
        s = s.replace('"', '&quot;')
    if '\n' in s:
        s = s.replace('\n', '<br/>')
    if nick:
        if get_config_boolean('color_nick'):
            nick = color_tag(nick)
        else:
            nick = '&lt;%s&gt;' %nick
        s = '<b>%s</b> %s' %(nick, s)
    return s

def send_notify(s, channel='', nick=''):
    #command = getattr(server, 'kde4')
    s = format(s, nick)
    server.enqueue(s, channel)

def is_displayed(buffer):
    """Returns True if buffer is in a window and the user is active. This is for not show
    notifications of a visible buffer while the user is doing something and wouldn't need to be
    notified."""
    window = weechat.buffer_get_integer(buffer, 'num_displayed')
    if window != 0:
        return not inactive()
    return False

def inactive():
    inactivity = int(weechat.info_get('inactivity', ''))
    #debug('user inactivity: %s' %inactivity)
    if inactivity > 20:
        return True
    else:
        return False

config_string = lambda s : weechat.config_string(weechat.config_get(s))
def get_nick(s):
    """Strip nickmodes and prefix, suffix."""
    if not s: return ''
    # prefix and suffix
    prefix = config_string('irc.look.nick_prefix')
    suffix = config_string('irc.look.nick_suffix')
    if s[0] == prefix:
        s = s[1:]
    if s[-1] == suffix:
        s = s[:-1]
    # nick mode
    modes = '~+@!%'
    s = s.lstrip(modes)
    return s

def notify_msg(workaround, buffer, time, tags, display, hilight, prefix, msg):
    if workaround and 'notify_message' not in tags and 'notify_private' not in tags:
        # weechat 0.3.0 bug
        return WEECHAT_RC_OK
    #debug('  '.join((buffer, time, tags, display, hilight, prefix, 'msg_len:%s' %len(msg))),
    #        prefix='MESSAGE')
    private = 'notify_private' in tags
    if (int(hilight) or private) and int(display):
        if 'irc_action' in tags:
            prefix, _, msg = msg.partition(' ')
            msg = '%s %s' %(config_string('weechat.look.prefix_action'), msg)
        prefix = get_nick(prefix)
        if prefix not in ignore_nick \
                and msg not in ignore_text \
                and not is_displayed(buffer):
            #debug('%sSending notification: %s' %(weechat.color('lightgreen'), channel), prefix='NOTIFY')
            if not private:
                channel = weechat.buffer_get_string(buffer, 'localvar_channel')
                if channel not in ignore_channel:
                    send_notify(msg, channel=channel, nick=prefix)
            else:
                send_notify(msg, channel=prefix)
    return WEECHAT_RC_OK

def cmd_notify(data, buffer, args):
    if args:
        args = args.split()
        cmd = args[0]
        if cmd in ('test', 'quit', 'restart', 'notify'):
            if cmd == 'test':
                server.send_rpc(' '.join(args[1:]) or 'This is a test.', '#test')
            elif cmd == 'notify':
                send_notify(' '.join(args[1:]) or 'This is a test.', '#test')
            elif cmd == 'quit':
                say('Shutting down notification daemon...')
                server.quit()
            elif cmd == 'restart':
                say('Restarting notification daemon...')
                server.restart()
            return WEECHAT_RC_OK

    weechat.command('', '/help %s' %SCRIPT_COMMAND)
    return WEECHAT_RC_OK

def ignore_update(*args):
    ignore_channel._get_ignores()
    ignore_nick._get_ignores()
    ignore_text._get_ignores()
    return WEECHAT_RC_OK

def server_update(*args):
    server._create_server()
    return WEECHAT_RC_OK


if __name__ == '__main__' and import_ok and \
        weechat.register(SCRIPT_NAME, SCRIPT_AUTHOR, SCRIPT_VERSION, SCRIPT_LICENSE, SCRIPT_DESC,
        '', ''):

    # pretty nick
    color_delimiter = weechat.color('chat_delimiters')
    color_nick = weechat.color('chat_nick')
    color_reset = weechat.color('reset')
    script_nick = '%s[%s%s%s]%s' %(color_delimiter, color_nick, SCRIPT_NAME, color_delimiter, color_reset)

    # check if we need to workaround a bug in 0.3.0
    workaround = ''
    version = weechat.info_get('version', '')
    if version == '0.3.0':
        workaround = '1'
        #debug('workaround enabled')

    for opt, val in settings.iteritems():
        if not weechat.config_is_set_plugin(opt):
            weechat.config_set_plugin(opt, val)

    ignore_channel = Ignores('ignore_channel')
    ignore_nick = Ignores('ignore_nick')
    ignore_text = Ignores('ignore_text')

    server = Server()

    weechat.hook_command(SCRIPT_COMMAND, SCRIPT_DESC, '[test [text] | notify [text] | restart | quit ]', 
"""\
   test: sends a test notification, with 'text' if provided ('text'
         is sent raw).
 notify: same as test, but the notification is sent through the
         notification queue and after formatting.
restart: forces remote daemon to restart.
   quit: forces remote daemon to shutdown, after this notifications
         won't be available and the daemon should be started again
         manually.

Setting notification ignores:
  It's possible to filter notification by channel, by nick or by
  message content, with the config options ignore_channel, 
  ignore_nick and ignore_text in plugins.var.python.%(script)s
  Each config option accepts a comma separated list of patterns.
  Wildcards '*', '?' and char groups [..] can be used.
  An ignore exception can be added by prefixing '!' in the pattern.

Examples:
  Setting 'ignore_nick' to 'troll,b[0o]t':
   will ignore notifications from troll, bot and b0t.
  Setting 'ignore_channel' to '*ubuntu*,!#ubuntu-offtopic':
   will ignore notifications from any channel with the word 'ubuntu'
   except from #ubuntu-offtopic.

Daemon:
  %(script)s script needs to connect to an external daemon for send
  notifications, which can be used in localhost or remotely.
  Download the daemon from:
  %(daemon_url)s
  and check its help with ./%(daemon)s --help.
  See also help in script file.
""" %dict(script=SCRIPT_NAME, daemon_url=DAEMON_URL, daemon=DAEMON)
            ,'test|notify|restart|quit', 'cmd_notify', '')

    weechat.hook_config('plugins.var.python.%s.ignore_*' %SCRIPT_NAME, 'ignore_update', '')
    weechat.hook_config('plugins.var.python.%s.server_*' %SCRIPT_NAME, 'server_update', '')

    weechat.hook_print('', 'notify_message', '', 1, 'notify_msg', workaround)
    weechat.hook_print('', 'notify_private', '', 1, 'notify_msg', workaround)


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