Merge branch 'plugins'

Conflicts:
	README
	src/core.py
	src/tabs.py

24 files changed, 1058 insertions, 20 deletions

diff --git a/README b/README
index 9897e687..752693d3 100644
--- a/README
+++ b/README
@@ -143,6 +143,7 @@ we merge it to “master” as well, of course).
 	Thanks
 =======================
 = People =
+ - Todd Eisenberger (todd@teisen.be) - Plugin system
  - Link Mauve - Code, testing
  - Gaëtan Ribémont (http://www.bonbref.com) - Logo design
  - Ovart - Testing
@@ -153,3 +154,4 @@ we merge it to “master” as well, of course).
    on the jabber chatroom doing bug reports and/or feature requests.
 = Project =
  Gajim - send_vcard method and common.py
+
diff --git a/data/default_config.cfg b/data/default_config.cfg
index 279f902d..e803a7d1 100644
--- a/data/default_config.cfg
+++ b/data/default_config.cfg
@@ -125,6 +125,13 @@ use_log = false
 # you want to use instead. This directory will be created if it doesn't exist
 log_dir =
 
+# If plugins_dir is not set, plugins will be loaded from $XDG_DATA_HOME/poezio/plugins.
+# You can specify an other directory to use. It will be created if it doesn't exist
+plugins_dir =
+
+# Space separated list of plugins to load on startup
+plugins_autoload =
+
 # the full path to the photo (avatar) you want to use
 # it should be less than 16Ko
 # The avatar is not set by default, because it slows
diff --git a/data/themes/dark.py b/data/themes/dark.py
index bbe226f8..015e2988 100644
--- a/data/themes/dark.py
+++ b/data/themes/dark.py
@@ -8,6 +8,7 @@ class DarkTheme(theming.Theme):
     COLOR_STATUS_CHAT = (34 , -1)
     COLOR_STATUS_UNAVAILABLE = (242 , -1)
     COLOR_STATUS_ONLINE = (27 , -1)
+    COLOR_STATUS_NONE = (27 , -1)
 
     COLOR_VERTICAL_SEPARATOR = (236, -1)
     COLOR_NEW_TEXT_SEPARATOR = (213, -1)
diff --git a/doc/en/plugins.txt b/doc/en/plugins.txt
new file mode 100644
index 00000000..47ab7f01
--- /dev/null
+++ b/doc/en/plugins.txt
@@ -0,0 +1,132 @@
+Plugins
+=======
+
+Currently, the plugins are in a plugin branch on the git repo.
+
+Location
+--------
+
+The plugins have to be present in '$XDG_DATA_HOME/poezio/plugins/plugin_name.py'
+(or '~/.local/share' if not defined)
+
+Structure
+---------
+
+A plugin must always be a class named Plugin that inherits the
+plugin.BasePlugin class defined into the *plugin* poezio module.
+
+Methods
+-------
+
+Overridden methods
+~~~~~~~~~~~~~~~~~~
+The *Plugin* class has several method that you can override for your own convenience
+
+[[init]]
+*init*:: +self+ +
+This method is called when the plugin is loaded, this is where you call
+the other methods, for example <<add-command,add_command>>, and initialize
+everything to make your plugin actually do something. <<example-1,ex 1>>, <<example-2,ex 2>>
+
+*cleanup*:: +self+ +
+Called when the plugin is unloaded (or when poezio is exited). Clean everything
+that needs to be cleaned here.
+
+Callable methods
+~~~~~~~~~~~~~~~~
+The BasePlugin has several methods that can be used. Here is a list of
+all its methods that you could use in your plugin, describing what they
+do, their arguments, and giving some example for each of them.
+
+[[add-command]]
+*add_command*:: +self+, +name+, +handler+, +help+, +completion=None+ + 
+This method adds a global command to poezio. For example you can add a /foo
+command that the user could call when the plugin is loaded, by calling this
+method with _foo_ as its _name_ argument. <<example-1,ex 1>>
+
+* _name_: (string) the name of the command (for example, if it is 'plugintest', it can
+add a /plugintest command)
+* _handler_: (function) the function to be called when the command is executed.
+the handler takes *args* as a parameter, which is a string of what
+is entered after the command. Split *args* (with _common.shell_split_) to use
+that as command arguments.
+* _help_: (string) the help message available for that command through the _/help_
+command.
+* _completion_: (function) the completion for the args of that command. It takes
+an input object as its only argument. This function should call the
+_auto_completion()_ method on the input object, passing a list of possible strings
+for the completion and returning the value of that call directly.
+Everything else is handled by that _auto_completion()_ method (checking what strings
+match, how to cycle between matches, etc). If you don’t want any special completion
+for that command, just pass None (the default value).
+
+*add_event_handler**: +self+, +event_name+, +handler+ +
+This methods adds a callback that will be called whenever the given event
+occurs. <<example-2,ex 2>>
+
+* _event_name_: (string) The name of the event you want to ``monitor''.
+This can be a sleekxmpp event, or a poezio event. See the list of
+<<events-list,all available events>>.
+* _handler_: The method that will be called whenever the event occurs.
+It must accept the arguments specified for that event in the <<events-list,events list>>.
+
+Attributes
+----------
+
+Config
+~~~~~~
+By default, each plugin has a PluginConfig object accessible with *self.config*.
+
+*PluginConfig.read*:: +self+ + 
+Reads the config file from $XDG_CONFIG_HOME/poezio/plugins/plugin_name.cfg, it is called upon initialization, so you should not need it.
+
+*PluginConfig.write*:: +self+ +
+Writes the config to the same file mentioned previously.
+
+Core
+~~~~
+Each plugin has a reference to the Core object accessible with *self.core*, that allows you to do about anything with poezio. Remember to use it only when you need it, and to use the functions described in this documentation only, even if much more is available. If your plugin needs to do something not available with these methods, please do a feature request instead of doing some dirty hacks with some other methods.
+
+Core methods
+^^^^^^^^^^^^
+CAUTION: TODO
+
+
+[[events-list]]
+Events list
+-----------
+CAUTION: TODO
+
+Examples
+--------
+
+[[example-1]]
+.Add a simple command that sends "Hello World!" into the conversation
+=====================================================================
+[source,python]
+---------------
+class Plugin(BasePlugin):
+    def init(self):
+    	self.add_command('hello', self.command_hello, "Usage: /hello\nHello: Send 'Hello World!'", None)
+
+    def command_hello(self, args):
+        self.core.send_message('Hello World!')
+---------------
+=====================================================================
+
+[[example-2]]
+
+.Adds an event handler that sends ``tg'' to a groupchat when a message is received from someone named ``Partauch''
+=====================================================================
+[source,python]
+---------------
+class Plugin(BasePlugin):
+    def init(self):
+    	self.add_event_handler('groupchat_message', self.on_groupchat_message)
+
+    def on_groupchat_message(self, message):
+        if message['mucnick'] == "Partauche":
+            self.core.send_message('tg', to=message.getMucroom())
+---------------
+=====================================================================
+
diff --git a/plugins/alias.py b/plugins/alias.py
new file mode 100644
index 00000000..eb596332
--- /dev/null
+++ b/plugins/alias.py
@@ -0,0 +1,40 @@
+from plugin import BasePlugin
+
+class Plugin(BasePlugin):
+    def init(self):
+        self.add_command('alias', self.command_alias, '/alias <alias> <command> <args>\nAlias: create an alias command')
+        self.add_command('unalias', self.command_unalias, '/unalias <alias>\nUnalias: remove a previously created alias')
+        self.commands = {}
+
+    def command_alias(self, line):
+        arg = line.split()
+        if len(arg) < 2:
+            self.core.information('Alias: Not enough parameters', 'Error')
+            return
+        alias = arg[0]
+        command = arg[1]
+        post_args = ' '.join(arg[2:])
+
+        if alias in self.core.commands or alias in self.commands:
+            self.core.information('Alias: command already exists', 'Error')
+            return
+        self.commands[alias] = lambda args: self.get_command(command)(post_args+args)
+        self.add_command(alias, self.commands[alias], 'This command is an alias for /%s %s' % (command, post_args))
+        self.core.information('Alias /%s successfuly created' % alias, 'Info')
+
+    def command_unalias(self, alias):
+        if alias in self.commands:
+            del self.commands[alias]
+            self.del_command(alias)
+            self.core.information('Alias /%s successfuly deleted' % alias, 'Info')
+
+    def get_command(self, name):
+        """Returns the function associated with a command"""
+        def dummy(args):
+            """Dummy function called if the command doesn’t exist"""
+            pass
+        if name in self.core.commands:
+            return self.core.commands[name][0]
+        elif name in self.core.current_tab().commands:
+            return self.core.current_tab().commands[name][0]
+        return dummy
diff --git a/plugins/day_change.py b/plugins/day_change.py
new file mode 100644
index 00000000..14924684
--- /dev/null
+++ b/plugins/day_change.py
@@ -0,0 +1,30 @@
+from gettext import gettext as _
+from plugin import BasePlugin
+import datetime
+import tabs
+import timed_events
+
+class Plugin(BasePlugin):
+    def init(self):
+        self.schedule_event()
+
+    def cleanup(self):
+        self.core.remove_timed_event(self.next_event)
+
+    def schedule_event(self):
+        day_change = datetime.datetime.combine(datetime.date.today(), datetime.time())
+        day_change += datetime.timedelta(1)
+        self.next_event = timed_events.TimedEvent(day_change, self.day_change)
+        self.core.add_timed_event(self.next_event)
+
+    def day_change(self):
+        msg = datetime.date.today().strftime(_("Day changed to %x"))
+
+        for tab in self.core.tabs:
+            if (isinstance(tab, tabs.MucTab) or
+                isinstance(tab, tabs.PrivateTab) or
+                isinstance(tab, tabs.ConversationTab)):
+                tab.add_message(msg)
+
+        self.core.refresh_window()
+        self.schedule_event()
diff --git a/plugins/exec.py b/plugins/exec.py
new file mode 100644
index 00000000..f7f451df
--- /dev/null
+++ b/plugins/exec.py
@@ -0,0 +1,43 @@
+# A plugin that can execute a command and send the result in the conversation
+
+from plugin import BasePlugin
+import os
+import common
+import shlex
+import subprocess
+
+class Plugin(BasePlugin):
+    def init(self):
+        self.add_command('exec', self.command_exec, "Usage: /exec [-o|-O] <command>\nExec: Execute a shell command and prints the result in the information buffer. The command should be ONE argument, that means it should be between \"\". The first argument (before the command) can be -o or -O. If -o is specified, it sends the result in the current conversation. If -O is specified, it sends the command and its result in the current conversation.\nExample: /exec -O \"uptime\" will send “uptime\n20:36:19 up  3:47,  4 users,  load average: 0.09, 0.13, 0.09” in the current conversation.")
+
+    def command_exec(self, args):
+        args = common.shell_split(args)
+        if len(args) == 1:
+            command = args[0]
+            arg = None
+        elif len(args) == 2:
+            command = args[1]
+            arg = args[0]
+        else:
+            self.core.command_help('exec')
+            return
+        try:
+            cut_command = shlex.split(command)
+        except Exception as e:
+            self.core.information('Failed to parse command: %s' % (e,), 'Error')
+            return
+        try:
+            process = subprocess.Popen(cut_command, stdout=subprocess.PIPE)
+        except OSError as e:
+            self.core.information('Failed to execute command: %s' % (e,), 'Error')
+            return
+        result = process.communicate()[0].decode('utf-8')
+        if arg and arg == '-o':
+            if not self.core.send_message('%s' % (result,)):
+                self.core.information('Cannot send result (%s), this is not a conversation tab' % result)
+        elif arg and arg == '-O':
+            if not self.core.send_message('%s:\n%s' % (command, result)):
+                self.core.information('Cannot send result (%s), this is not a conversation tab' % result)
+        else:
+            self.core.information('%s:\n%s' % (command, result), 'Info')
+        return
diff --git a/plugins/figlet.py b/plugins/figlet.py
new file mode 100644
index 00000000..cf885352
--- /dev/null
+++ b/plugins/figlet.py
@@ -0,0 +1,13 @@
+from plugin import BasePlugin
+import subprocess
+
+class Plugin(BasePlugin):
+    def init(self):
+        self.add_poezio_event_handler('muc_say', self.figletize)
+        self.add_poezio_event_handler('conversation_say', self.figletize)
+        self.add_poezio_event_handler('private_say', self.figletize)
+
+    def figletize(self, msg):
+        process = subprocess.Popen(['figlet', msg['body']], stdout=subprocess.PIPE)
+        result = process.communicate()[0].decode('utf-8')
+        msg['body'] = result
diff --git a/plugins/link.py b/plugins/link.py
new file mode 100644
index 00000000..8ef52982
--- /dev/null
+++ b/plugins/link.py
@@ -0,0 +1,47 @@
+# A plugin that adds the /link command, letting you open links that are pasted
+# in the conversation, without having to click them.
+
+import os
+import re
+
+from plugin import BasePlugin, PluginConfig
+from xhtml import clean_text
+import common
+
+url_pattern = re.compile(r'\b(http[s]?://(?:\S+))\b', re.I|re.U)
+
+class Plugin(BasePlugin):
+    def init(self):
+        self.add_command('link', self.command_link, "Usage: /link\nLink: opens the last link from the conversation into a browser.")
+
+    def find_link(self, nb):
+        messages = self.core.get_conversation_messages()
+        if not messages:
+            return None
+        for message in messages[::-1]:
+            matches = url_pattern.findall(clean_text(message.txt))
+            if matches:
+                for url in matches[::-1]:
+                    if nb == 1:
+                        return url
+                    else:
+                        nb -= 1
+        return None
+
+    def command_link(self, args):
+        args = common.shell_split(args)
+        if len(args) == 1:
+            try:
+                nb = int(args[0])
+            except:
+                return self.core.command_help('link')
+        else:
+            nb = 1
+        link = self.find_link(nb)
+        if link:
+            self.core.exec_command('%s %s' % (self.config.get('browser', 'firefox'), link))
+        else:
+            self.core.information('No URL found.', 'Warning')
+
+    def cleanup(self):
+        del self.config
diff --git a/plugins/mpd_client.py b/plugins/mpd_client.py
new file mode 100644
index 00000000..b56e0d7f
--- /dev/null
+++ b/plugins/mpd_client.py
@@ -0,0 +1,29 @@
+# a plugin adding a command to manipulate an MPD instance
+
+from plugin import BasePlugin
+from common import shell_split
+import mpd
+
+class Plugin(BasePlugin):
+    def init(self):
+        self.add_command('mpd', self.command_mpd, "Usage: /mpd [full]\nMpd: sends a message showing the current song of an MPD instance. If full is provided, the message is more verbose.", self.completion_mpd)
+
+    def command_mpd(self, args):
+        args = shell_split(args)
+        c = mpd.MPDClient()
+        c.connect(host=self.config.get('host', 'localhost'), port=self.config.get('port', '6600'))
+        password = self.config.get('password', '')
+        if password:
+            c.password(password)
+        current = c.currentsong()
+        current_time = float(c.status()['elapsed'])
+
+        s = '%(artist)s - %(title)s (%(album)s)' % current
+        if 'full' in args:
+            pourcentage = int(current_time / float(current['time']) * 10)
+            s += ' \x192[\x191' + '-'*(pourcentage-1) + '\x193+' + '\x191' + '-' * (10-pourcentage-1) + '\x192]\x19o'
+        if not self.core.send_message('%s' % (s,)):
+            self.core.information('Cannot send result (%s), this is not a conversation tab' % result)
+
+    def completion_mpd(self, the_input):
+        return the_input.auto_completion(['full'])
diff --git a/plugins/rainbow.py b/plugins/rainbow.py
new file mode 100644
index 00000000..0f242027
--- /dev/null
+++ b/plugins/rainbow.py
@@ -0,0 +1,20 @@
+from plugin import BasePlugin
+import xhtml
+import random
+
+possible_colors = list(range(256))
+# remove the colors that are almost white or almost black
+for col in [16, 232, 233, 234, 235, 236, 237, 15, 231, 255, 254, 253, 252, 251]:
+    possible_colors.remove(col)
+
+def rand_color():
+    return '\x19%s}' % (random.choice(possible_colors),)
+
+class Plugin(BasePlugin):
+    def init(self):
+        self.add_poezio_event_handler('muc_say', self.rainbowize)
+        self.add_poezio_event_handler('private_say', self.rainbowize)
+        self.add_poezio_event_handler('conversation_say', self.rainbowize)
+
+    def rainbowize(self, msg):
+        msg['body'] = ''.join(['%s%s' % (rand_color(),char,) for char in xhtml.clean_text(msg['body'])])
diff --git a/plugins/screen_detach.py b/plugins/screen_detach.py
new file mode 100644
index 00000000..6ee96896
--- /dev/null
+++ b/plugins/screen_detach.py
@@ -0,0 +1,46 @@
+from plugin import BasePlugin
+import os
+import stat
+import pyinotify
+
+SCREEN_DIR = '/var/run/screen/S-%s' % (os.getlogin(),)
+
+class Plugin(BasePlugin):
+    def init(self):
+        self.timed_event = None
+        sock_path = None
+        self.thread = None
+        for f in os.listdir(SCREEN_DIR):
+            path = os.path.join(SCREEN_DIR, f)
+            if screen_attached(path):
+                sock_path = path
+                self.attached = True
+                break
+
+        # Only actually do something if we found an attached screen (assuming only one)
+        if sock_path:
+            wm = pyinotify.WatchManager()
+            wm.add_watch(sock_path, pyinotify.EventsCodes.ALL_FLAGS['IN_ATTRIB'])
+            self.thread = pyinotify.ThreadedNotifier(wm, default_proc_fun=HandleScreen(plugin=self))
+            self.thread.start()
+
+    def cleanup(self):
+        if self.thread:
+            self.thread.stop()
+
+    def update_screen_state(self, socket):
+        attached = screen_attached(socket)
+        if attached != self.attached:
+            self.attached = attached
+            status = 'available' if self.attached else 'away'
+            self.core.command_status(status)
+
+def screen_attached(socket):
+    return (os.stat(socket).st_mode & stat.S_IXUSR) != 0
+
+class HandleScreen(pyinotify.ProcessEvent):
+    def my_init(self, **kwargs):
+        self.plugin = kwargs['plugin']
+
+    def process_IN_ATTRIB(self, event):
+        self.plugin.update_screen_state(event.path)
diff --git a/plugins/status.py b/plugins/status.py
new file mode 100644
index 00000000..7eb27cb5
--- /dev/null
+++ b/plugins/status.py
@@ -0,0 +1,21 @@
+from plugin import BasePlugin
+
+class Plugin(BasePlugin):
+    """
+    Adds several convenient aliases to /status command
+    """
+    def init(self):
+        self.add_command('dnd', lambda line: self.core.command_status('dnd '+line),
+                '/dnd [status message]\nDnd: Set your status as dnd (do not disturb).')
+        self.add_command('busy', lambda line: self.core.command_status('busy '+line),
+                '/busy [status message]\nBusy: Set your status as busy.')
+        self.add_command('chat', lambda line: self.core.command_status('chat '+line),
+                '/chat [status message]\nChat: Set your status as chatty.')
+        self.add_command('xa', lambda line: self.core.command_status('xa '+line),
+                '/xa [status message]\nXa: Set your status as xa (eXtended away).')
+        self.add_command('afk', lambda line: self.core.command_status('afk '+line),
+                '/afk [status message]\nAfk: Set your status as afk (away from keyboard).')
+        self.add_command('away', lambda line: self.core.command_status('away '+line),
+                '/away [status message]\nAway: Set your status as away.')
+        self.add_command('away', lambda line: self.core.command_status('away '+line),
+                '/available [status message]\nAvailable: Set your status as available.')
diff --git a/plugins/test.py b/plugins/test.py
new file mode 100644
index 00000000..0d5cdb0a
--- /dev/null
+++ b/plugins/test.py
@@ -0,0 +1,20 @@
+from plugin import BasePlugin
+
+class Plugin(BasePlugin):
+    def init(self):
+        self.add_command('plugintest', self.command_plugintest, 'Test command')
+        self.add_event_handler('message', self.on_message)
+        self.core.information("Plugin loaded")
+        self.core.connect('enter', self.on_enter)
+
+    def cleanup(self):
+        self.core.information("Plugin unloaded")
+
+    def on_enter(self, line):
+        self.core.information('Text sent: {}'.format(line))
+
+    def on_message(self, message):
+        self.core.information("Test plugin received message: {}".format(message))
+
+    def command_plugintest(self, args):
+        self.core.information("Command! With args {}".format(args))
diff --git a/plugins/translate.py b/plugins/translate.py
new file mode 100644
index 00000000..520d02b4
--- /dev/null
+++ b/plugins/translate.py
@@ -0,0 +1,34 @@
+from plugin import BasePlugin
+import urllib.request
+from urllib.parse import urlencode
+import xhtml
+import json
+
+TARGET_LANG = 'en'
+
+def translate(s, target=TARGET_LANG, source=''):
+    f = urllib.request.urlopen('http://ajax.googleapis.com/ajax/services/language/translate', urlencode({ 'v': '1.0', 'q': s, 'langpair': '%s|%s' % (source, target) }))
+    response = json.loads(str(f.read(), 'utf-8'))['responseData']
+    return (response['translatedText'], response['detectedSourceLanguage'])
+
+class Plugin(BasePlugin):
+    def init(self):
+        self.add_event_handler('groupchat_message', self.on_groupchat_message)
+
+    def on_groupchat_message(self, message):
+        try:
+            room_from = message.getMucroom()
+            if message['type'] == 'error':
+                return
+
+            if room_from == 'poezio@muc.poezio.eu':
+                nick_from = message['mucnick']
+                body = xhtml.get_body_from_message_stanza(message)
+                room = self.core.get_room_by_name(room_from)
+                text, lang = translate(body)
+                if lang != TARGET_LANG:
+                    room.add_message(text, nickname=nick_from)
+                    self.core.refresh_window()
+        except Exception as e:
+            import traceback
+            self.core.information("Exception in translator! %s" % (traceback.format_exc(),))
diff --git a/src/core.py b/src/core.py
index 2bea288c..cabd1580 100644
--- a/src/core.py
+++ b/src/core.py
@@ -16,6 +16,8 @@ import traceback
 
 from datetime import datetime
 
+from inspect import getargspec
+
 import common
 import theming
 import logging
@@ -30,11 +32,14 @@ import multiuserchat as muc
 import tabs
 
 import xhtml
+import events
 import pubsub
 import windows
 import connection
 import timed_events
 
+from plugin_manager import PluginManager
+
 from data_forms import DataFormsTab
 from config import config, options
 from logger import logger
@@ -43,6 +48,7 @@ from contact import Contact, Resource
 from text_buffer import TextBuffer
 from keyboard import read_char
 from theming import get_theme
+from fifo import Fifo
 from windows import g_lock
 
 # http://xmpp.org/extensions/xep-0045.html#errorstatus
@@ -72,6 +78,7 @@ class Core(object):
     """
     User interface using ncurses
     """
+
     def __init__(self):
         # All uncaught exception are given to this callback, instead
         # of being displayed on the screen and exiting the program.
@@ -79,7 +86,9 @@ class Core(object):
         self.status = Status(show=None, message='')
         sys.excepthook = self.on_exception
         self.running = True
+        self.events = events.EventHandler()
         self.xmpp = singleton.Singleton(connection.Connection)
+        self.remote_fifo = None
         # a unique buffer used to store global informations
         # that are displayed in almost all tabs, in an
         # information window.
@@ -98,6 +107,7 @@ class Core(object):
         #  a completion function, taking a Input as argument. Can be None)
         #  The completion function should return True if a completion was
         #  made ; False otherwise
+        self.plugin_manager = PluginManager(self)
         self.commands = {
             'help': (self.command_help, '\_o< KOIN KOIN KOIN', self.completion_help),
             'join': (self.command_join, _("Usage: /join [room_name][@server][/nick] [password]\nJoin: Join the specified room. You can specify a nickname after a slash (/). If no nickname is specified, you will use the default_nick in the configuration file. You can omit the room name: you will then join the room you\'re looking at (useful if you were kicked). You can also provide a room_name without specifying a server, the server of the room you're currently in will be used. You can also provide a password to join the room.\nExamples:\n/join room@server.tld\n/join room@server.tld/John\n/join room2\n/join /me_again\n/join\n/join room@server.tld/my_nick password\n/join / password"), self.completion_join),
@@ -121,6 +131,9 @@ class Core(object):
             'connect': (self.command_reconnect, _('Usage: /connect\nConnect: Disconnect from the remote server if you are currently connected and then connect to it again.'), None),
             'server_cycle': (self.command_server_cycle, _('Usage: /server_cycle [domain] [message]\nServer Cycle: Disconnect and reconnect in all the rooms in domain.'), None),
             'bind': (self.command_bind, _('Usage: /bind <key> <equ>\nBind: Bind a key to an other key or to a “command”. For example "/bind ^H KEY_UP" makes Control + h do the same same as the Up key.'), None),
+            'load': (self.command_load, _('Usage: /load <plugin>\nLoad: Load the specified plugin'), self.plugin_manager.completion_load),
+            'unload': (self.command_unload, _('Usage: /unload <plugin>\nUnload: Unload the specified plugin'), self.plugin_manager.completion_unload),
+            'plugins': (self.command_plugins, _('Usage: /plugins\nPlugins: Show the plugins in use.'), None),
             }
 
         self.key_func = {
@@ -165,6 +178,15 @@ class Core(object):
 
         self.timed_events = set()
 
+        self.connected_events = {}
+
+        self.autoload_plugins()
+
+    def autoload_plugins(self):
+        plugins = config.get('plugins_autoload', '')
+        for plugin in plugins.split():
+            self.plugin_manager.load(plugin)
+
     def start(self):
         """
         Init curses, create the first tab, etc
@@ -547,6 +569,7 @@ class Core(object):
             tab = self.open_private_window(room_from, nick_from, False)
             if not tab:
                 return
+        self.events.trigger('private_msg', message)
         body = xhtml.get_body_from_message_stanza(message)
         if not body:
             return
@@ -596,6 +619,7 @@ class Core(object):
         When receiving "normal" messages (from someone in our roster)
         """
         jid = message['from']
+        self.events.trigger('conversation_msg', message)
         body = xhtml.get_body_from_message_stanza(message)
         if not body:
             if message['type'] == 'error':
@@ -1036,6 +1060,7 @@ class Core(object):
         if tab.get_user_by_name(nick_from) and\
                 tab.get_user_by_name(nick_from) in tab.ignores:
             return
+        self.events.trigger('muc_msg', message)
         body = xhtml.get_body_from_message_stanza(message)
         if body:
             date = date if delayed == True else None
@@ -1117,6 +1142,34 @@ class Core(object):
     def completion_status(self, the_input):
         return the_input.auto_completion([status for status in possible_show], ' ')
 
+    def command_load(self, arg):
+        """
+        /load <plugin>
+        """
+        args = arg.split()
+        if len(args) != 1:
+            self.command_help('load')
+            return
+        filename = args[0]
+        self.plugin_manager.load(filename)
+
+    def command_unload(self, arg):
+        """
+        /unload <plugin>
+        """
+        args = arg.split()
+        if len(args) != 1:
+            self.command_help('unload')
+            return
+        filename = args[0]
+        self.plugin_manager.unload(filename)
+
+    def command_plugins(self, arg):
+        """
+        /plugins
+        """
+        self.information("Plugins currently in use: %s" % repr(list(self.plugin_manager.plugins.keys())), 'Info')
+
     def command_message(self, arg):
         """
         /message <jid> [message]
@@ -1393,24 +1446,6 @@ class Core(object):
         msg = "%s=%s" % (option, value)
         self.information(msg, 'Info')
 
-    def command_away(self, arg):
-        """
-        /away [msg]
-        """
-        self.command_status("away "+arg)
-
-    def command_busy(self, arg):
-        """
-        /busy [msg]
-        """
-        self.command_status("busy "+arg)
-
-    def command_avail(self, arg):
-        """
-        /avail [msg]
-        """
-        self.command_status("available "+arg)
-
     def close_tab(self, tab=None):
         """
         Close the given tab. If None, close the current one
@@ -1602,3 +1637,54 @@ class Core(object):
         if not self.running or self.background is True:
             return
         curses.doupdate()
+
+    def send_message(self, msg):
+        """
+        Function to use in plugins to send a message in the current conversation.
+        Returns False if the current tab is not a conversation tab
+        """
+        if not isinstance(self.current_tab(), tabs.ChatTab):
+            return False
+        self.current_tab().command_say(msg)
+        return True
+
+    def exec_command(self, command):
+        """
+        Execute an external command on the local or a remote
+        machine, depending on the conf. For example, to open a link in a
+        browser, do exec_command("firefox http://poezio.eu"),
+        and this will call the command on the correct computer.
+        The remote execution is done by writing the command on a fifo.
+        That fifo has to be on the machine where poezio is running, and
+        accessible (through sshfs for example) from the local machine (where
+        poezio is not running). A very simple daemon reads on that fifo,
+        and executes any command that is read in it.
+        """
+        command = '%s\n' % (command,)
+        if config.get('exec_remote', 'false') == 'true':
+            # We just write the command in the fifo
+            if not self.remote_fifo:
+                try:
+                    self.remote_fifo = Fifo(os.path.join(config.get('remote_fifo_path', './'), 'poezio.fifo'), 'w')
+                except (OSError, IOError) as e:
+                    self.information('Could not open fifo file for writing: %s' % (e,), 'Error')
+                    return
+            try:
+                self.remote_fifo.write(command)
+            except (IOError) as e:
+                self.information('Could not execute [%s]: %s' % (command.strip(), e,), 'Error')
+                self.remote_fifo = None
+        else:
+            pass
+
+    def get_conversation_messages(self):
+        """
+        Returns a list of all the messages in the current chat.
+        If the current tab is not a ChatTab, returns None.
+
+        Messages are namedtuples of the form
+        ('txt nick_color time str_time nickname user')
+        """
+        if not isinstance(self.current_tab(), tabs.ChatTab):
+            return None
+        return self.current_tab().get_conversation_messages()
diff --git a/src/daemon.py b/src/daemon.py
new file mode 100755
index 00000000..f23d6b5f
--- /dev/null
+++ b/src/daemon.py
@@ -0,0 +1,50 @@
+#/usr/bin/env python3
+# Copyright 2011 Florent Le Coz <louiz@louiz.org>
+#
+# This file is part of Poezio.
+#
+# Poezio is free software: you can redistribute it and/or modify
+# it under the terms of the zlib license. See the COPYING file.
+
+"""
+This file is a standalone program that reads commands on
+stdin and executes them (each line should be a command).
+
+Usage: cat some_fifo | ./daemon.py
+
+Poezio writes commands in the fifo, and this daemon executes them on the
+local machine.
+Note that you should not start this daemon if you do not trust the remote
+machine that is running poezio, since this could make it run any (dangerous)
+command on your local machine.
+"""
+
+import sys
+import threading
+import subprocess
+
+class Executor(threading.Thread):
+    """
+    Just a class to execute commands in a thread.
+    This way, the execution can totally fail, we don’t care,
+    and we can start commands without having to wait for them
+    to return
+    """
+    def __init__(self, command):
+        threading.Thread.__init__(self)
+        self.command = command
+
+    def run(self):
+        print('executing %s' % (self.command.strip(),))
+        subprocess.call(self.command.split())
+
+def main():
+    while True:
+        line = sys.stdin.readline()
+        if line == '':
+            break
+        e = Executor(line)
+        e.start()
+
+if __name__ == '__main__':
+    main()
diff --git a/src/data_forms.py b/src/data_forms.py
index a7bbe97f..8445d3d2 100644
--- a/src/data_forms.py
+++ b/src/data_forms.py
@@ -152,6 +152,26 @@ class DummyInput(FieldInput, windows.Win):
     def is_dummy(self):
         return True
 
+class ColoredLabel(windows.Win):
+    def __init__(self, text):
+        self.text = text
+        self.color = 14
+        windows.Win.__init__(self)
+
+    def resize(self, height, width, y, x):
+        self._resize(height, width, y, x)
+
+    def set_color(self, color):
+        self.color = color
+        self.refresh()
+
+    def refresh(self):
+        with g_lock:
+            self._win.attron(curses.color_pair(self.color))
+            self.addstr(0, 0, self.text)
+            self._win.attroff(curses.color_pair(self.color))
+            self._refresh()
+
 class BooleanWin(FieldInput, windows.Win):
     def __init__(self, field):
         FieldInput.__init__(self, field)
@@ -502,6 +522,7 @@ class FormWin(object):
         for i, inp in enumerate(self.inputs):
             if i >= self.height:
                 break
+            inp['label'].refresh()
             inp['input'].refresh()
             inp['label'].refresh()
         if self.current_input < self.height-1:
diff --git a/src/events.py b/src/events.py
new file mode 100644
index 00000000..22d60ddf
--- /dev/null
+++ b/src/events.py
@@ -0,0 +1,70 @@
+#
+# This file is part of Poezio.
+#
+# Poezio is free software: you can redistribute it and/or modify
+# it under the terms of the zlib license. See the COPYING file.
+
+"""
+Defines the EventHandler class
+"""
+
+import logging
+log = logging.getLogger(__name__)
+
+class EventHandler(object):
+    """
+    A class keeping a list of possible events that are triggered
+    by poezio. You (a plugin for example) can add an event handler
+    associated with an event name, and whenever that event is triggered,
+    the callback is called
+    """
+    def __init__(self):
+        self.events = {
+            # when you are highlighted in a muc tab
+            'highlight': [],
+            'muc_say': [],
+            'conversation_say': [],
+            'private_say': [],
+            'conversation_msg': [],
+            'private_msg': [],
+            'muc_msg': [],
+            }
+
+    def add_event_handler(self, name, callback, position=0):
+        """
+        Add a callback to a given event.
+        Note that if that event name doesn’t exist, it just returns False.
+        If it was successfully added, it returns True
+        position: 0 means insert a the beginning, -1 means end
+        """
+        if name not in self.events:
+            return False
+
+        if position >= 0:
+            self.events[name].insert(position, callback)
+        else:
+            self.events[name].append(callback)
+
+        return True
+
+    def trigger(self, name, *args, **kwargs):
+        """
+        Call all the callbacks associated to the given event name
+        """
+        callbacks = self.events[name]
+        for callback in callbacks:
+            callback(*args, **kwargs)
+
+    def del_event_handler(self, name, callback):
+        """
+        Remove the callback from the list of callbacks of the given event
+        """
+        if not name:
+            for event in self.events:
+                while callback in self.events[event]:
+                    self.events[event].remove(callback)
+            return True
+        else:
+            if callback in self.events[name]:
+                self.events[name].remove(callback)
+
diff --git a/src/fifo.py b/src/fifo.py
new file mode 100644
index 00000000..8306e24b
--- /dev/null
+++ b/src/fifo.py
@@ -0,0 +1,70 @@
+# Copyright 2011 Florent Le Coz <louiz@louiz.org>
+#
+# This file is part of Poezio.
+#
+# Poezio is free software: you can redistribute it and/or modify
+# it under the terms of the zlib license. See the COPYING file.
+
+"""
+Defines the Fifo class
+"""
+
+import logging
+log = logging.getLogger(__name__)
+
+import os
+import threading
+
+class OpenTrick(threading.Thread):
+    """
+    A threaded trick to make the open for writing succeed.
+    A fifo cannot be opened for writing if it has not been
+    yet opened by the other hand for reading.
+    So, we just open the fifo for reading and close it
+    immediately afterwards.
+    Once that is done, we can freely keep the fifo open for
+    writing and write things in it. The writing can fail if
+    there’s still nothing reading that fifo, but we just yell
+    an error in that case.
+    """
+    def __init__(self, path):
+        threading.Thread.__init__(self)
+        self.path = path
+
+    def run(self):
+        open(self.path, 'r').close()
+
+
+class Fifo(object):
+    """
+    Just a simple file handler, writing and reading in a fifo.
+    Mode is either 'r' or 'w', just like the mode for the open()
+    function.
+    """
+    def __init__(self, path, mode):
+        self.trick = None
+        if not os.path.exists(path):
+            os.mkfifo(path)
+        if mode == 'w':
+            self.trick = OpenTrick(path)
+            # that thread will wait until we open it for writing
+            self.trick.start()
+        self.fd = open(path, mode)
+
+    def write(self, data):
+        """
+        Try to write on the fifo. If that fails, this means
+        that nothing has that fifo opened, so the writing is useless,
+        so we just return (and display an error telling that, somewhere).
+        """
+        self.fd.write(data)
+        self.fd.flush()
+
+    def readline(self):
+        return self.fd.readline()
+
+    def __del__(self):
+        try:
+            self.fd.close()
+        except:
+            pass
diff --git a/src/plugin.py b/src/plugin.py
new file mode 100644
index 00000000..80bc4dfc
--- /dev/null
+++ b/src/plugin.py
@@ -0,0 +1,92 @@
+import os
+from configparser import ConfigParser
+import config
+import inspect
+import traceback
+
+class PluginConfig(config.Config):
+    def __init__(self, filename):
+        ConfigParser.__init__(self)
+        self.__config_file__ = filename
+        self.read()
+
+    def read(self):
+        """Read the config file"""
+        ConfigParser.read(self, self.__config_file__)
+
+    def write(self):
+        """Write the config to the disk"""
+        try:
+            fp = open(self.__config_file__, 'w')
+            ConfigParser.write(self, fp)
+            fp.close()
+            return True
+        except IOError:
+            return False
+
+
+class SafetyMetaclass(type):
+    # A hack
+    core = None
+
+    @staticmethod
+    def safe_func(f):
+        def helper(*args, **kwargs):
+            try:
+                return f(*args, **kwargs)
+            except:
+                if inspect.stack()[1][1] == inspect.getfile(f):
+                    raise
+                elif SafetyMetaclass.core:
+                    SafetyMetaclass.core.information(traceback.format_exc())
+                    return None
+        return helper
+
+    def __new__(meta, name, bases, class_dict):
+        for k, v in class_dict.items():
+            if inspect.isfunction(v):
+                class_dict[k] = SafetyMetaclass.safe_func(v)
+        return type.__new__(meta, name, bases, class_dict)
+
+class BasePlugin(object, metaclass=SafetyMetaclass):
+    """
+    Class that all plugins derive from.  Any methods beginning with command_
+    are interpreted as a command and beginning with on_ are interpreted as
+    event handlers
+    """
+
+    def __init__(self, plugin_manager, core, plugins_conf_dir):
+        self.core = core
+        # More hack; luckily we'll never have more than one core object
+        SafetyMetaclass.core = core
+        self.plugin_manager = plugin_manager
+        conf = os.path.join(plugins_conf_dir, self.__module__+'.cfg')
+        self.config = PluginConfig(conf)
+        self.init()
+
+    def init(self):
+        pass
+
+    def cleanup(self):
+        pass
+
+    def unload(self):
+        self.cleanup()
+
+    def add_command(self, name, handler, help, completion=None):
+        return self.plugin_manager.add_command(self.__module__, name, handler, help, completion)
+
+    def del_command(self, name):
+        return self.plugin_manager.del_command(self.__module__, name)
+
+    def add_event_handler(self, event_name, handler):
+        return self.plugin_manager.add_event_handler(self.__module__, event_name, handler)
+
+    def del_event_handler(self, event_name, handler):
+        return self.plugin_manager.del_event_handler(self.__module__, event_name, handler)
+
+    def add_poezio_event_handler(self, event_name, handler, position=0):
+        return self.plugin_manager.add_poezio_event_handler(self.__module__, event_name, handler, position)
+
+    def del_poezio_event_handler(self, event_name, handler):
+        return self.plugin_manager.del_poezio_event_handler(self.__module__, event_name, handler)
diff --git a/src/plugin_manager.py b/src/plugin_manager.py
new file mode 100644
index 00000000..bdf94a5b
--- /dev/null
+++ b/src/plugin_manager.py
@@ -0,0 +1,137 @@
+import imp
+import os
+import sys
+from config import config
+from gettext import gettext as _
+
+plugins_dir = config.get('plugins_dir', '')
+plugins_dir = plugins_dir or\
+    os.path.join(os.environ.get('XDG_DATA_HOME') or\
+                     os.path.join(os.environ.get('HOME'), '.local', 'share'),
+                 'poezio', 'plugins')
+
+config_home = os.environ.get("XDG_CONFIG_HOME")
+if not config_home:
+    config_home = os.path.join(os.environ.get('HOME'), '.config')
+plugins_conf_dir = os.path.join(config_home, 'poezio', 'plugins')
+
+try:
+    os.makedirs(plugins_dir)
+except OSError:
+    pass
+
+try:
+    os.makedirs(plugins_conf_dir)
+except OSError:
+    pass
+
+sys.path.append(plugins_dir)
+
+class PluginManager(object):
+    def __init__(self, core):
+        self.core = core
+        self.modules = {} # module name -> module object
+        self.plugins = {} # module name -> plugin object
+        self.commands = {} # module name -> dict of commands loaded for the module
+        self.event_handlers = {} # module name -> list of event_name/handler pairs loaded for the module
+        self.poezio_event_handlers = {}
+
+    def load(self, name):
+        if name in self.plugins:
+            self.unload(name)
+
+        try:
+            if name in self.modules:
+                imp.acquire_lock()
+                module = imp.reload(self.modules[name])
+                imp.release_lock()
+            else:
+                file, filename, info = imp.find_module(name, [plugins_dir])
+                imp.acquire_lock()
+                module = imp.load_module(name, file, filename, info)
+                imp.release_lock()
+        except Exception as e:
+            import traceback
+            self.core.information(_("Could not load plugin: ") + traceback.format_exc(), 'Error')
+            return
+        finally:
+            if imp.lock_held():
+                imp.release_lock()
+
+        self.modules[name] = module
+        self.commands[name] = {}
+        self.event_handlers[name] = []
+        self.poezio_event_handlers[name] = []
+        self.plugins[name] = module.Plugin(self, self.core, plugins_conf_dir)
+
+    def unload(self, name):
+        if name in self.plugins:
+            try:
+                for command in self.commands[name].keys():
+                    del self.core.commands[command]
+                for event_name, handler in self.event_handlers[name]:
+                    self.core.xmpp.del_event_handler(event_name, handler)
+                for handler in self.poezio_event_handlers[name]:
+                    self.core.events.del_event_handler(None, handler)
+
+                self.plugins[name].unload()
+                del self.plugins[name]
+                del self.commands[name]
+                del self.event_handlers[name]
+                del self.poezio_event_handlers[name]
+            except Exception as e:
+                import traceback
+                self.core.information(_("Could not unload plugin (may not be safe to try again): ") + traceback.format_exc())
+
+    def del_command(self, module_name, name):
+        if name in self.commands[module_name]:
+            del self.commands[module_name][name]
+            if name in self.core.commands:
+                del self.core.commands[name]
+
+    def add_command(self, module_name, name, handler, help, completion=None):
+        if name in self.core.commands:
+            raise Exception(_("Command '%s' already exists") % (name,))
+
+        commands = self.commands[module_name]
+        commands[name] = (handler, help, completion)
+        self.core.commands[name] = (handler, help, completion)
+
+    def add_event_handler(self, module_name, event_name, handler):
+        eh = self.event_handlers[module_name]
+        eh.append((event_name, handler))
+        self.core.xmpp.add_event_handler(event_name, handler)
+
+    def del_event_handler(self, module_name, event_name, handler):
+        self.core.xmpp.del_event_handler(event_name, handler)
+        eh = self.event_handlers[module_name]
+        eh = list(filter(lambda e : e != (event_name, handler), eh))
+
+    def add_poezio_event_handler(self, module_name, event_name, handler, position):
+        eh = self.poezio_event_handlers[module_name]
+        eh.append(handler)
+        self.core.events.add_event_handler(event_name, handler, position)
+
+    def del_poezio_event_handler(self, module_name, event_name, handler):
+        self.core.events.del_event_handler(None, handler)
+        eh = self.poezio_event_handlers[module_name]
+        eh = list(filter(lambda e : e != handler, eh))
+
+    def completion_load(self, the_input):
+        """
+        completion function that completes the name of the plugins, from
+        all .py files in plugins_dir
+        """
+        try:
+            names = os.listdir(plugins_dir)
+        except OSError as e:
+            self.core.information(_('Completion failed: %s' % e), 'Error')
+            return
+        plugins_files = [name[:-3] for name in names if name.endswith('.py')]
+        return the_input.auto_completion(plugins_files, '')
+
+    def completion_unload(self, the_input):
+        """
+        completion function that completes the name of the plugins that are loaded
+        """
+        return the_input.auto_completion(list(self.plugins.keys()), '')
diff --git a/src/tabs.py b/src/tabs.py
index 611202e4..6f100741 100644
--- a/src/tabs.py
+++ b/src/tabs.py
@@ -390,6 +390,9 @@ class ChatTab(Tab):
         self.text_win.refresh()
         self.input.refresh()
 
+    def get_conversation_messages(self):
+        return self._text_buffer.messages
+
     def command_say(self, line):
         raise NotImplementedError
 
@@ -716,6 +719,10 @@ class MucTab(ChatTab):
         msg = self.core.xmpp.make_message(self.get_name())
         msg['type'] = 'groupchat'
         msg['body'] = line
+        # trigger the event BEFORE looking for colors.
+        # This lets a plugin insert \x19xxx} colors, that will
+        # be converted in xhtml.
+        self.core.events.trigger('muc_say', msg)
         if msg['body'].find('\x19') != -1:
             msg['xhtml_im'] = xhtml.poezio_colors_to_html(msg['body'])
             msg['body'] = xhtml.clean_text(msg['body'])
@@ -1207,6 +1214,10 @@ class PrivateTab(ChatTab):
         msg = self.core.xmpp.make_message(self.get_name())
         msg['type'] = 'chat'
         msg['body'] = line
+        # trigger the event BEFORE looking for colors.
+        # This lets a plugin insert \x19xxx} colors, that will
+        # be converted in xhtml.
+        self.core.events.trigger('private_say', msg)
         self.core.add_message_to_text_buffer(self._text_buffer, msg['body'], None, self.core.own_nick or self.own_nick)
         if msg['body'].find('\x19') != -1:
             msg['xhtml_im'] = xhtml.poezio_colors_to_html(msg['body'])
@@ -1402,6 +1413,7 @@ class RosterInfoTab(Tab):
         self.commands['remove'] = (self.command_remove, _("Usage: /remove [jid]\nRemove: Remove the specified JID from your roster. This wil unsubscribe you from its presence, cancel its subscription to yours, and remove the item from your roster."), self.completion_remove)
         self.commands['export'] = (self.command_export, _("Usage: /export [/path/to/file]\nExport: Export your contacts into /path/to/file if specified, or $HOME/poezio_contacts if not."), None)
         self.commands['import'] = (self.command_import, _("Usage: /import [/path/to/file]\nImport: Import your contacts from /path/to/file if specified, or $HOME/poezio_contacts if not."), None)
+        self.commands['clear_infos'] = (self.command_clear_infos, _("Usage: /clear_infos\nClear Infos: Use this command to clear the info buffer."), None)
         self.resize()
 
     def resize(self):
@@ -1422,6 +1434,15 @@ class RosterInfoTab(Tab):
                 not self.input.help_message:
             self.complete_commands(self.input)
 
+    def command_clear_infos(self, arg):
+        """
+        /clear_infos
+        """
+        self.core.information_buffer.messages = []
+        self.information_win.rebuild_everything(self.core.information_buffer)
+        self.core.information_win.rebuild_everything(self.core.information_buffer)
+        self.refresh()
+
     def command_deny(self, args):
         """
         Denies a JID from our roster
@@ -1869,6 +1890,11 @@ class ConversationTab(ChatTab):
         msg = self.core.xmpp.make_message(self.get_name())
         msg['type'] = 'chat'
         msg['body'] = line
+        # trigger the event BEFORE looking for colors.
+        # and before displaying the message in the window
+        # This lets a plugin insert \x19xxx} colors, that will
+        # be converted in xhtml.
+        self.core.events.trigger('conversation_say', msg)
         self.core.add_message_to_text_buffer(self._text_buffer, msg['body'], None, self.core.own_nick)
         if msg['body'].find('\x19') != -1:
             msg['xhtml_im'] = xhtml.poezio_colors_to_html(msg['body'])
@@ -1982,6 +2008,9 @@ class ConversationTab(ChatTab):
         if config.get('send_chat_states', 'true') == 'true':
             self.send_chat_state('gone')
 
+    def add_message(self, txt, time=None, nickname=None, forced_user=None):
+        self._text_buffer.add_message(txt, time, nickname, None, None, forced_user)
+
 class MucListTab(Tab):
     """
     A tab listing rooms from a specific server, displaying various information,
diff --git a/src/xhtml.py b/src/xhtml.py
index 44195f90..99e0bf01 100644
--- a/src/xhtml.py
+++ b/src/xhtml.py
@@ -255,7 +255,6 @@ def xhtml_to_poezio_colors(text):
             key, value = rule.split(':', 1)
             key = key.strip()
             value = value.strip()
-            log.debug(value)
             if key == 'background-color':
                 pass#shell += '\x191'
             elif key == 'color':
@@ -278,7 +277,6 @@ def xhtml_to_poezio_colors(text):
     def trim(string):
         return re.sub(whitespace_re, ' ', string)
 
-    log.debug(text)
     xml = ET.fromstring(text)
     message = ''
     if version_info[1] == 2: