feat(owothia): Add owothia

Add owothia, an irc bot that picks a random verb out of a random subset
of messages and replies with a message of the form "<verb> me owo".

it's incredibly messy, full of warnings, includes a *number* of harcoded
things, but also is hilarious.

Change-Id: I73cacd533bbbff9e753d1e542308da25247a7034
Reviewed-on: https://cl.tvl.fyi/c/depot/+/1063
Tested-by: BuildkiteCI
Reviewed-by: lukegb <lukegb@tvl.fyi>

users/glittershark/owothia/src/Main.hs

@@ -0,0 +1,97 @@
+{-# LANGUAGE TemplateHaskell #-}
+module Main where
+
+import           Network.IRC.Client
+import           Control.Lens
+import           NLP.POS
+import           NLP.Types (POSTagger)
+import           NLP.Types.Tree
+import qualified NLP.Types.Tree
+import qualified NLP.Corpora.Conll as Conll
+import           NLP.Corpora.Conll (Tag)
+import qualified Data.ByteString as BS
+import qualified Data.Text as T
+import           System.Random
+import           System.Envy
+--------------------------------------------------------------------------------
+
+data Config = Config
+  { _nickservPassword :: Text
+  }
+  deriving stock (Show, Eq, Generic)
+  deriving anyclass (FromEnv)
+makeLenses ''Config
+
+verbs :: POSTagger Tag -> Text -> [Text]
+verbs tagger s = mapMaybe pickVerb $ tag tagger s >>= \(TaggedSent ps) -> ps
+  where
+    pickVerb (POS Conll.VB (Token verb)) = Just verb
+    pickVerb (POS Conll.VBD (Token verb)) = Just verb
+    pickVerb (POS Conll.VBG (Token verb)) = Just verb
+    pickVerb (POS Conll.VBN (Token verb)) = Just verb
+    pickVerb (POS Conll.VBZ (Token verb)) = Just verb
+    pickVerb _ = Nothing
+
+randomVerb :: POSTagger Tag -> Text -> IO (Maybe Text)
+randomVerb tagger txt = do
+  let vs = verbs tagger txt
+  i <- randomRIO (0, length vs - 1)
+  pure $ vs ^? ix i
+
+owo :: Text -> Text
+owo = (<> " me owo")
+
+owoChance = 10
+
+doOwo :: MonadIO m => m Bool
+doOwo = do
+  n <- liftIO (randomRIO @Int (0, owoChance))
+  liftIO $ putStrLn $ "rolled " <> show n
+  pure $ n == 0
+
+owothiaHandler :: Config -> IORef Bool -> POSTagger Tag -> EventHandler s
+owothiaHandler conf state tagger = EventHandler Just $ \src ev -> do
+  hasIdentified <- readIORef state
+  when (not hasIdentified) $ do
+    nickservAuth
+    send $ Join "##tvl"
+    writeIORef state True
+
+  when ("You are now identified" `BS.isInfixOf` (ev ^. raw)) $
+    send $ Join "##tvl"
+
+  case (src, ev ^. message) of
+    (Channel "##tvl" nick, Privmsg _ (Right m)) -> do
+      willOwo <- doOwo
+      when willOwo $ owoMessage m
+    _ -> pure ()
+
+  pure ()
+
+  where
+    owoMessage m = do
+      mVerb <- liftIO $ randomVerb tagger m
+      for_ mVerb $ \verb -> send $ Privmsg "##tvl" $ Right $ owo verb
+    nickservAuthMsg = "IDENTIFY " <> myNick <> " " <> conf ^. nickservPassword
+    nickservAuth = send $ Privmsg "NickServ" $ Right nickservAuthMsg
+
+myNick :: Text
+myNick = "owothia"
+
+run :: ByteString -> Int -> IO ()
+run host port = do
+  Right conf <- decodeEnv
+  tagger <- defaultTagger
+  state <- newIORef False
+  let conn =
+        plainConnection host port
+          & logfunc .~ stdoutLogger
+      cfg =
+        defaultInstanceConfig myNick
+          & channels .~ ["##tvl"]
+          & handlers %~ (owothiaHandler conf state tagger : )
+  runClient conn cfg ()
+
+main :: IO ()
+main = do
+  run "irc.freenode.net" 6667