From e743734bac88c7845d82147a79a8208d3c1f9c12 Mon Sep 17 00:00:00 2001
From: Ben Kurtovic <ben.kurtovic@verizon.net>
Date: Tue, 19 Apr 2011 01:29:18 -0400
Subject: [PATCH] redoing irc command management: rewriting triggers and
 creating a BaseCommand class, also some changes to Data and Connection

---
 core/main.py        |  3 +-
 irc/base_command.py | 24 ++++++++++++++++
 irc/connection.py   |  8 +++---
 irc/data.py         | 12 ++++++--
 irc/frontend.py     | 17 ++++++++----
 irc/triggers.py     | 79 +++++++++++++++++++++++++++++++++++++----------------
 6 files changed, 107 insertions(+), 36 deletions(-)
 create mode 100644 irc/base_command.py

diff --git a/core/main.py b/core/main.py
index bcf2889..8cc7273 100644
--- a/core/main.py
+++ b/core/main.py
@@ -35,12 +35,13 @@ def irc_watcher(f_conn):
 def run():
     global f_conn
     f_conn = frontend.get_connection()
+    frontend.startup(f_conn)
     
     t_watcher = threading.Thread(target=irc_watcher, args=(f_conn,))
     t_watcher.daemon = True
     t_watcher.start()
 
-    frontend.main(f_conn)
+    frontend.main()
 
     w_conn.close()
     f_conn.close()
diff --git a/irc/base_command.py b/irc/base_command.py
new file mode 100644
index 0000000..2e1f123
--- /dev/null
+++ b/irc/base_command.py
@@ -0,0 +1,24 @@
+# -*- coding: utf-8  -*-
+
+# A base class for commands on IRC.
+
+class BaseCommand(object):
+    def __init__(self, connection):
+        """docstring"""
+        self.connection = connection
+
+    def get_hook(self):
+        """Hooks are: 'msg', 'msg_private', 'msg_public', and 'join'."""
+        return None
+
+    def get_help(self, command):
+        """docstring"""
+        return None
+
+    def check(self, data):
+        """docstring"""
+        return False
+
+    def process(self, data):
+        """docstring"""
+        pass
diff --git a/irc/connection.py b/irc/connection.py
index a2c2ac0..1bcbefa 100644
--- a/irc/connection.py
+++ b/irc/connection.py
@@ -5,8 +5,8 @@
 import socket
 import threading
 
-class Connection:
-    def __init__(self, host, port, nick, ident, realname):
+class Connection(object):
+    def __init__(self, host=None, port=None, nick=None, ident=None, realname=None):
         """a class to interface with IRC"""
         self.host = host
         self.port = port
@@ -50,9 +50,9 @@ class Connection:
         """send a message"""
         self.send("PRIVMSG %s :%s" % (target, msg))
 
-    def reply(self, target, nick, msg):
+    def reply(self, data, msg):
         """send a message as a reply"""
-        self.say(target, "%s%s%s: %s" % (chr(2), nick, chr(0x0f), msg))
+        self.say(data.chan, "%s%s%s: %s" % (chr(2), data.nick, chr(0x0f), msg))
 
     def action(self, target, msg):
         """send a message as an action"""
diff --git a/irc/data.py b/irc/data.py
index 092e709..0d0fc7b 100644
--- a/irc/data.py
+++ b/irc/data.py
@@ -2,7 +2,7 @@
 
 # A class to store data from an individual line received on IRC.
 
-class Data:
+class Data(object):
     def __init__(self):
         """store data from an individual line received on IRC"""
         self.chan = str()
@@ -17,9 +17,17 @@ class Data:
         while '' in args: # remove any empty arguments
             args.remove('')
 
+        self.args = args[1:] # the command arguments
+        self.is_command = False # whether this is a real command or not
+
         try:
             self.command = args[0] # the command itself
         except IndexError:
             self.command = None
 
-        self.args = args[1:] # the command arguments
+        try:
+            if self.command.startswith('!') or self.command.startswith('.'):
+                self.is_command = True
+                self.command = self.command[1:] # strip '!' or '.'
+        except AttributeError:
+            pass
diff --git a/irc/frontend.py b/irc/frontend.py
index 1c6967a..6780096 100644
--- a/irc/frontend.py
+++ b/irc/frontend.py
@@ -10,12 +10,19 @@ from irc import triggers
 from irc.connection import Connection
 from irc.data import Data
 
+connection = None
+
 def get_connection():
     connection = Connection(HOST, PORT, NICK, IDENT, REALNAME)
     return connection
 
-def main(connection):
+def startup(conn):
+    global connection
+    connection = conn
+    triggers.init_commands(connection)
     connection.connect()
+
+def main():
     read_buffer = str()
 
     while 1:
@@ -36,7 +43,7 @@ def main(connection):
                 data.nick, data.ident, data.host = re.findall(":(.*?)!(.*?)@(.*?)\Z", line[0])[0]
                 data.chan = line[2][1:]
 
-                triggers.check(connection, data, "join") # check if there's anything we can respond to, and if so, respond
+                triggers.check("join", data) # check if there's anything we can respond to, and if so, respond
 
             if line[1] == "PRIVMSG":
                 data.nick, data.ident, data.host = re.findall(":(.*?)!(.*?)@(.*?)\Z", line[0])[0]
@@ -45,11 +52,11 @@ def main(connection):
 
                 if data.chan == NICK: # this is a privmsg to us, so set 'chan' as the nick of the sender
                     data.chan = data.nick
-                    triggers.check(connection, data, "msg_private") # only respond if it's a private message
+                    triggers.check("msg_private", data) # only respond if it's a private message
                 else:
-                    triggers.check(connection, data, "msg_public") # only respond if it's a public (channel) message
+                    triggers.check("msg_public", data) # only respond if it's a public (channel) message
 
-                triggers.check(connection, data, "msg") # check for general messages
+                triggers.check("msg", data) # check for general messages
 
                 if data.msg.startswith("!restart"): # hardcode the !restart command (we can't restart from within an ordinary command)
                     if data.host in OWNERS:
diff --git a/irc/triggers.py b/irc/triggers.py
index 0e6cda1..e6dfe38 100644
--- a/irc/triggers.py
+++ b/irc/triggers.py
@@ -1,36 +1,67 @@
 # -*- coding: utf-8  -*-
 
-# Check what events on IRC we can respond to.
+# A module to manage IRC commands.
 
-from irc.commands import test, help, git, link, chanops
+import os
+import traceback
 
-def check(connection, data, hook):
-    data.parse_args() # parse command arguments into data.command and data.args
+commands = []
+
+def init_commands(connection, silent=False):
+    """load all valid command classes from irc/commmands/ into the commands variable"""
+    files = os.listdir(os.path.join("irc", "commands")) # get all files in irc/commands/
+
+    for f in files:
+        if f.startswith("_") or not f.endswith(".py"): # ignore non-python files or files beginning with "_"
+            continue
+
+        module = f[:-3] # strip .py from end
 
-    if hook == "join":
-        pass
+        try:
+            exec "from irc.commands import %s" % module
+        except: # importing the file failed for some reason...
+            if not silent:
+                print "Couldn't load file %s:" % f
+                traceback.print_exc()
+            continue
 
-    if hook == "msg_private":
-        pass
+        m = eval(module) # 'module' is a string, so get the actual object for processing
+        process_module(connection, m)
 
-    if hook == "msg_public":
-        pass
+    if not silent:
+        pretty_cmnds = map(lambda c: c.__class__.__name__, commands)
+        print "Found %s command classes: %s." % (len(commands), ', '.join(pretty_cmnds))
 
-    if hook == "msg":
-        if data.command == "!test":
-            test.call(connection, data)
+def process_module(connection, module):
+    """go through all objects in a module and add valid command classes to the commands variable"""
+    global commands
+    objects = dir(module)
 
-        elif data.command == "!help":
-            help.call(connection, data)
+    for this_obj in objects: # go through everything in the file
+        obj = eval("module.%s" % this_obj) # this_obj is a string, so get the actual object corresponding to that string
 
-        elif data.command == "!git":
-            git.call(connection, data)
+        try:
+            bases = obj.__bases__
+        except AttributeError: # object isn't a valid class, so ignore it
+            continue
 
-        elif (data.command == "!link" or
-        ("[[" in data.msg and "]]" in data.msg) or
-        ("{{" in data.msg and "}}" in data.msg)):
-            link.call(connection, data)
+        for base in bases:
+            if base.__name__ == "BaseCommand": # this inherits BaseCommand, so it must be a command class
+                command = obj(connection) # initialize a new command object
+                commands.append(command)
+                print "Added command class %s from %s..." % (this_obj, module.__name__)
+                continue
+
+def get_commands():
+    """get our commands"""
+    return commands
+
+def check(hook, data):
+    """given an event on IRC, check if there's anything we can respond to by calling each command class"""
+    data.parse_args() # parse command arguments into data.command and data.args
 
-        elif (data.command == "!voice" or data.command == "!devoice" or
-        data.command == "!op" or data.command == "!deop"):
-            chanops.call(connection, data)
+    for command in commands:
+        if command.get_hook() == hook:
+            if command.check(data):
+                command.process(data)
+                break