From d2f40f64819ec0b19911c684ea919beebf16af6d Mon Sep 17 00:00:00 2001
From: Julien Dessaux
Date: Thu, 4 Feb 2010 20:38:06 +0100
Subject: Finished changing plugin data structure to Maps.

---
 Hsbot/Plugin.hs | 25 +++++++++++++++++++------
 1 file changed, 19 insertions(+), 6 deletions(-)

(limited to 'Hsbot/Plugin.hs')

diff --git a/Hsbot/Plugin.hs b/Hsbot/Plugin.hs
index 662f8e9..2121c7d 100644
--- a/Hsbot/Plugin.hs
+++ b/Hsbot/Plugin.hs
@@ -1,27 +1,34 @@
 module Hsbot.Plugin
     ( loadPlugin
+    , pluginExists
     , sendToPlugin
     ) where
 
 import Control.Concurrent
 import Control.Concurrent.Chan
 import Control.Monad.State
+import qualified Data.Map as M
 import System.IO
 import System.Plugins
 
 import Hsbot.Types
 import Hsbot.Utils
 
+-- TODO : unload plugin, reload plugin, list plugins, etc
+
 -- | Loads a plugin into an ircBot
 loadPlugin :: String -> IrcBot ()
 loadPlugin name = do
     bot <- get
-    plugin <- liftIO $ effectivelyLoadPlugin name (botChannel bot)
-    case plugin of
-        Just plugin' -> do
-            let oldPlugins = botPlugins bot
-            put $ bot { botPlugins = plugin' : oldPlugins } -- TODO : clean with a correct append
-        Nothing -> return ()
+    let oldPlugins = botPlugins bot
+    if name `M.member` oldPlugins
+      then traceM $ inColor ("Can't load plugin \"" ++ name ++ "\", this identifier has already been registered.") [31]
+      else do
+        plugin <- liftIO $ effectivelyLoadPlugin name (botChannel bot)
+        case plugin of
+            Just plugin' -> do
+                put $ bot { botPlugins = M.insert name plugin' oldPlugins}
+            Nothing -> return ()
 
 -- | Effectively try to load a plugin
 effectivelyLoadPlugin :: String -> Chan BotMsg -> IO (Maybe Plugin)
@@ -54,3 +61,9 @@ sendToPlugin msg plugin = do
     let chan = pluginChannel plugin
     liftIO $ writeChan chan msg
 
+-- | Tells if a plugin is loaded or not
+pluginExists :: String -> IrcBot Bool
+pluginExists name = do
+    plugins <- gets botPlugins
+    return $ name `M.member` plugins
+
-- 
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