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module Hsbot.Plugin
( loadPlugin
, sendToPlugin
, reloadPlugin
, unloadPlugin
) where
import Control.Concurrent
import Control.Concurrent.Chan
import Control.Exception
import Control.Monad.State
import qualified Data.Map as M
import Data.Maybe
import System.IO
import System.Plugins
import Hsbot.Types
import Hsbot.Utils
-- TODO : reload plugin, list plugins, etc
-- | Loads a plugin into an ircBot
loadPlugin :: String -> IrcBot ()
loadPlugin name = do
bot <- get
let oldPlugins = botPlugins bot
if name `M.member` oldPlugins
then traceM $ inColor ("Can't load plugin \"" ++ name ++ "\", this identifier has already been registered.") [31] -- or a wait, smthg like that?
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)
effectivelyLoadPlugin name serverChan = do
-- TODO : test if Plugins/ ++ name ++ .hs exists
m <- liftIO $ makeAll ("Plugins/" ++ name ++ ".hs") ["-XScopedTypeVariables"]
plugin <- case m of
MakeSuccess _ _ -> do
ldstat <- load_ ("Plugins/" ++ name ++ ".o") [".","Hsbot","Hsbot/Plugins"] ("main" ++ name)
case ldstat of
LoadSuccess v entryPoint -> do
putStrLn $ inColor ("Loaded plugin: " ++ name) [32]
chan <- newChan :: IO (Chan BotMsg)
threadId <- forkIO $ entryPoint serverChan chan
return $ Just (Plugin name v threadId chan)
LoadFailure e -> do
putStrLn $ inColor ("Couldn't load plugin: " ++ name) [31]
mapM_ putStrLn e
return Nothing
MakeFailure e -> do
putStrLn $ inColor ("FATAL: Couldn't compile plugin: " ++ name) [31]
mapM_ putStrLn e
return Nothing
return plugin
-- | Reloads a plugin
-- TODO : make it a safe reload (compile before unloading)
reloadPlugin :: String -> IrcBot ()
reloadPlugin name = do
unloadPlugin name
loadPlugin name
-- | Unloads a plugin
unloadPlugin :: String -> IrcBot ()
unloadPlugin name = do
bot <- get
let oldPlugins = botPlugins bot
case M.lookup name oldPlugins of
Just plugin -> do
let newPlugins = M.delete name oldPlugins
liftIO $ throwTo (pluginThreadId plugin) UserInterrupt
liftIO $ unloadAll $ pluginModule plugin
put $ bot { botPlugins = newPlugins }
Nothing -> return ()
-- | Sends a msg to a plugin
sendToPlugin :: BotMsg -> Plugin -> IrcBot ()
sendToPlugin msg plugin = do
let chan = pluginChannel plugin
liftIO $ writeChan chan msg
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