From ed87f26db763432505072eb5a2875f30fc4061d1 Mon Sep 17 00:00:00 2001
From: mathieui <mathieui@mathieui.net>
Date: Sat, 1 Oct 2011 23:48:42 +0200
Subject: Added a connect() function to the plugins API, for internal event

---
 plugins/test.py       |  4 ++++
 src/core.py           | 61 +++++++++++++++++++++++++++++++++++++++++++++++++++
 src/plugin_manager.py |  3 +++
 src/tabs.py           |  1 +
 4 files changed, 69 insertions(+)

diff --git a/plugins/test.py b/plugins/test.py
index 13ba1e9c..0d5cdb0a 100644
--- a/plugins/test.py
+++ b/plugins/test.py
@@ -5,10 +5,14 @@ class Plugin(BasePlugin):
         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))
 
diff --git a/src/core.py b/src/core.py
index 0e09cf04..41a54b23 100644
--- a/src/core.py
+++ b/src/core.py
@@ -16,6 +16,7 @@ import threading
 import traceback
 
 from datetime import datetime
+from inspect import getargspec
 
 import common
 import theming
@@ -78,6 +79,13 @@ class Core(object):
     """
     User interface using ncurses
     """
+
+    # dict containing the name of the internal events
+    # used with the plugins, the key is the name of the event
+    # and the value is the number of arguments the handler must take
+    internal_events = {
+        'enter': 2,
+    }
     def __init__(self):
         # All uncaught exception are given to this callback, instead
         # of being displayed on the screen and exiting the program.
@@ -174,6 +182,8 @@ class Core(object):
         self.xmpp.add_event_handler("chatstate_inactive", self.on_chatstate_inactive)
 
         self.timed_events = set()
+
+        self.connected_events = {}
         self.autoload_plugins()
 
     def autoload_plugins(self):
@@ -210,6 +220,57 @@ class Core(object):
             ))
         self.refresh_window()
 
+    def connect(self, event, handler):
+        """
+        Connect an handler to an internal event of poezio
+        (eg "enter pressed in a chattab")
+        """
+        # Fail if the method doesn’t take at least the good number of arguments
+        # or if the event is unknown
+        if not event in self.internal_events \
+                or len(getargspec(handler).args) < self.internal_events[event]:
+            return False
+
+        module_name = handler.__module__
+        if not event in self.connected_events:
+            self.connected_events[event] = {}
+        if not module_name in self.connected_events[event]:
+            self.connected_events[event][module_name] = []
+
+        self.connected_events[event][module_name].append(handler)
+        return True
+
+    def run_event(self, event, **kwargs):
+        """
+        Call the handlers associated with an event
+        """
+        if event in self.connected_events:
+            for module in self.connected_events[event]:
+                for handler in self.connected_events[event][module]:
+                    try:
+                        handler(**kwargs)
+                    except:
+                        import traceback
+                        tp = traceback.format_exc()
+                        module_name = handler.__name__
+                        log.debug('ERROR: in plugin %s, \n%s' % (module_name, tp))
+
+    def disconnect(self, event, handler):
+        """
+        Disconnect a handler from an event
+        """
+        if not event in self.internal_events:
+            return False
+
+        module_name = getmodule(handler).__name__
+        if not event in self.connected_events:
+            return False
+        if not module_name in self.connected_events[event]:
+            return False
+
+        self.connected_events[event][module_name].remove(handler)
+        return True
+
     def resize_global_information_win(self):
         """
         Resize the global_information_win only once at each resize.
diff --git a/src/plugin_manager.py b/src/plugin_manager.py
index df96e9ab..82be8632 100644
--- a/src/plugin_manager.py
+++ b/src/plugin_manager.py
@@ -69,6 +69,9 @@ class PluginManager(object):
                     del self.core.commands[command]
                 for event_name, handler in self.event_handlers[name]:
                     self.core.xmpp.del_event_handler(event_name, handler)
+                for event_name in self.core.internal_events:
+                    if name in event_name:
+                        del event_name[name]
 
                 self.plugins[name].unload()
                 del self.plugins[name]
diff --git a/src/tabs.py b/src/tabs.py
index bc656cdd..a349da0b 100644
--- a/src/tabs.py
+++ b/src/tabs.py
@@ -298,6 +298,7 @@ class ChatTab(Tab):
             if not self.execute_command(clean_text):
                 if txt.startswith('//'):
                     txt = txt[1:]
+                self.core.run_event('enter', line=txt)
                 self.command_say(txt)
         self.cancel_paused_delay()
 
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