From 11c2c16835b3e8368be77ccc5b7ddf949021eccd Mon Sep 17 00:00:00 2001
From: Julien Dessaux
Date: Sat, 3 Jul 2010 21:26:00 +0200
Subject: Moved files around as a preliminary for architectural changes.

---
 HsbotIrcBot/Hsbot/Irc/Plugin.hs | 97 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 97 insertions(+)
 create mode 100644 HsbotIrcBot/Hsbot/Irc/Plugin.hs

(limited to 'HsbotIrcBot/Hsbot/Irc/Plugin.hs')

diff --git a/HsbotIrcBot/Hsbot/Irc/Plugin.hs b/HsbotIrcBot/Hsbot/Irc/Plugin.hs
new file mode 100644
index 0000000..2c8e84b
--- /dev/null
+++ b/HsbotIrcBot/Hsbot/Irc/Plugin.hs
@@ -0,0 +1,97 @@
+module Hsbot.Irc.Plugin
+    ( IrcPlugin
+    , IrcPluginState (..)
+    , killIrcPlugin
+    , listPlugins
+    , loadIrcPlugin
+    , sendToPlugin
+    , spawnIrcPlugins
+    , unloadIrcPlugin
+    ) where
+
+import Control.Concurrent
+import Control.Concurrent.Chan ()
+import Control.Exception
+import Control.Monad.State
+import qualified Data.Map as M
+
+import Hsbot.Irc.Config
+import Hsbot.Irc.Message
+import Hsbot.Irc.Plugin.Core
+import Hsbot.Irc.Plugin.Dummy
+import Hsbot.Irc.Plugin.Ping
+import Hsbot.Irc.Plugin.Quote
+import Hsbot.Irc.Plugin.Utils
+import Hsbot.Irc.Types
+
+-- | Sends a msg to a plugin
+sendToPlugin :: IrcBotMsg -> IrcPluginState -> IrcBot ()
+sendToPlugin ircBotMsg plugin = do
+    liftIO $ writeChan (ircPluginChan plugin) ircBotMsg
+
+-- | spawns IrcPlugins
+spawnIrcPlugins :: IrcBot ()
+spawnIrcPlugins = do
+    config <- gets ircBotConfig
+    mapM_ (loadIrcPlugin) (ircConfigPlugins config)
+
+-- | loads an ircbot plugin
+loadIrcPlugin :: String -> IrcBot ()
+loadIrcPlugin pluginName = do
+    ircbot <- get
+    let masterChan  = ircBotChan ircbot
+    pluginChan <- liftIO (newChan :: IO (Chan IrcBotMsg))
+    let entryPoint = case pluginName of
+                        "Core"  -> ircBotPluginCore
+                        "Ping"  -> ircBotPluginPing
+                        "Quote" -> ircBotPluginQuote
+                        _       -> ircBotPluginDummy
+    let oldPlugins    = ircBotPlugins ircbot
+        oldResumeData = ircBotResumeData ircbot
+    -- We check for unicity
+    case M.lookup pluginName oldPlugins of
+        Just _  -> return ()
+        Nothing -> do
+            mvar <- liftIO newEmptyMVar
+            threadId <- liftIO . forkIO $ finally (entryPoint pluginChan masterChan) (putMVar mvar ())
+            let plugin        = IrcPluginState { ircPluginName       = pluginName
+                                               , ircPluginChan       = pluginChan
+                                               , ircPluginMasterChan = masterChan }
+                newPlugins    = M.insert pluginName (plugin, mvar, threadId) oldPlugins
+                newResumeData = M.insert "PLUGINS" (show $ M.keys newPlugins) oldResumeData
+            put $ ircbot { ircBotPlugins    = newPlugins
+                         , ircBotResumeData = newResumeData }
+
+-- | Sends a list of loaded plugins
+listPlugins :: IrcMsg -> String -> IrcBot ()
+listPlugins originalRequest dest = do
+    plugins <- gets ircBotPlugins
+    let listing = unwords $ M.keys plugins
+    case M.lookup dest plugins of
+        Just (plugin, _, _) -> sendToPlugin (IntIrcCmd $ IrcCmd "ANSWER" "CORE" dest listing originalRequest) plugin
+        Nothing          -> return ()
+
+-- | Unloads a plugin
+unloadIrcPlugin :: String -> IrcBot ()
+unloadIrcPlugin name = do
+    killIrcPlugin name
+    ircbot <- get
+    let oldResumeData = ircBotResumeData ircbot
+        newPlugins    = M.keys $ ircBotPlugins ircbot
+        newResumeData = M.insert "PLUGINS" (show newPlugins) oldResumeData
+    put $ ircbot { ircBotResumeData = newResumeData }
+
+-- | kills a plugin
+killIrcPlugin :: String -> IrcBot ()
+killIrcPlugin name = do
+    ircbot <- get
+    let oldPlugins = ircBotPlugins ircbot
+    -- We check if the plugin exists
+    case M.lookup name oldPlugins of
+        Just (_, mvar, threadId) -> do
+            let newPlugins = M.delete name oldPlugins
+            liftIO $ throwTo threadId UserInterrupt
+            put $ ircbot { ircBotPlugins = newPlugins }
+            liftIO $ takeMVar mvar
+        Nothing            -> return ()
+
-- 
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