chore(owothia): move to //fun/owothia

Owothia graduates, or something.

Mostly I don't want infrastructure to depend on stuff in //users.

Does anyone know where owothia is running anyways?

Change-Id: I198c7ac935736c7aee3ba4fbda1453b82aa10283
Reviewed-on: https://cl.tvl.fyi/c/depot/+/3103
Tested-by: BuildkiteCI
Reviewed-by: grfn <grfn@gws.fyi>

fun/owothia/src/Main.hs

@@ -0,0 +1,156 @@
+{-# LANGUAGE TemplateHaskell #-}
+module Main where
+
+import           Network.IRC.Client
+import           Control.Lens
+import           NLP.POS
+import           NLP.Types (POSTagger)
+import qualified NLP.Types.Tags as Tags
+import           NLP.Types.Tree
+import qualified NLP.Corpora.Conll as Conll
+import           NLP.Corpora.Conll (Tag)
+import qualified Data.ByteString as BS
+import           System.Random
+import           System.Envy
+import           Data.Maybe
+import qualified Data.Text
+--------------------------------------------------------------------------------
+
+data Config = Config
+  { _owoChance :: Int
+  , _ircServer :: ByteString
+  , _ircPort :: Int
+  , _ircServerPassword :: Maybe Text
+  , _nickservPassword :: Maybe Text
+  , _ircNick :: Maybe Text
+  }
+  deriving stock (Show, Eq, Generic)
+makeLenses ''Config
+
+instance FromEnv Config where
+  fromEnv _ =
+    Config <$> env "OWO_CHANCE"
+       <*> env "IRC_SERVER"
+       <*> env "IRC_PORT"
+       <*> envMaybe "IRC_SERVER_PASSWORD"
+       <*> envMaybe "NICKSERV_PASSWORD"
+       <*> envMaybe "IRC_NICK"
+
+stopWord :: Text -> Bool
+stopWord "'s"   = True
+stopWord "\""   = True
+stopWord "is"   = True
+stopWord "are"  = True
+stopWord "am"   = True
+stopWord "were" = True
+stopWord "was"  = True
+stopWord "be"   = True
+stopWord _      = False
+
+pickVerb :: POS Tag -> Maybe Text
+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
+
+pickNoun :: POS Tag -> Maybe Text
+pickNoun (POS Conll.NN (Token noun)) = Just noun
+pickNoun _ = Nothing
+
+randomPOS
+  :: Tags.Tag tag
+  => (POS tag -> Maybe Text)
+  -> POSTagger tag
+  -> Text
+  -> IO (Maybe Text)
+randomPOS pickPOS tagger s = do
+  let candidates
+        = filter (not . stopWord)
+        . mapMaybe pickPOS
+        $ tag tagger s >>= \(TaggedSent ps) -> ps
+  i <- randomRIO (0, length candidates - 1)
+  pure $ candidates ^? ix i
+
+doOwo :: MonadIO m => Config -> m Bool
+doOwo conf = do
+  n <- liftIO (randomRIO @Int (0, conf ^. owoChance))
+  pure $ n == 0
+
+data OwoType = Noun | Verb
+  deriving stock (Show, Eq)
+
+instance Random OwoType where
+  random = over _1 (bool Noun Verb) . random
+  randomR = const random
+
+vowels :: [Char]
+vowels = "aeiou"
+
+article :: Text -> Text
+article (x :< _) | x `elem` vowels = "an"
+article _ = "a"
+
+owo :: OwoType -> Text -> Text
+owo Noun n = mconcat
+  [ "I'm "
+  , article n
+  , " "
+  , n
+  , if "o" `Data.Text.isSuffixOf` n
+    then "wo"
+    else " owo"
+  ]
+owo Verb v = v <> " me owo"
+
+pickOwo :: OwoType -> POS Tag -> Maybe Text
+pickOwo Verb = pickVerb
+pickOwo Noun = pickNoun
+
+randomOwo :: OwoType -> POSTagger Tag -> Text -> IO (Maybe Text)
+randomOwo = randomPOS . pickOwo
+
+owothiaHandler :: Config -> Text -> IORef Bool -> POSTagger Tag -> EventHandler s
+owothiaHandler conf nick 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 conf
+      when willOwo $ owoMessage m
+    _ -> pure ()
+
+  pure ()
+
+  where
+    owoMessage m = do
+      owoType <- liftIO randomIO
+      mWord <- liftIO $ randomOwo owoType tagger m
+      for_ mWord $ \word -> send $ Privmsg "##tvl" $ Right $ owo owoType word
+    nickservAuthMsg = "IDENTIFY " <> nick <> " " <> fromJust (conf ^. nickservPassword)
+    nickservAuth = send $ Privmsg "NickServ" $ Right nickservAuthMsg
+
+main :: IO ()
+main = do
+  conf <- either fail pure =<< decodeEnv
+  tagger <- defaultTagger
+  state <- newIORef $ not . isJust $ (conf ^. nickservPassword)
+  let nick = fromMaybe "owothia" (conf ^. ircNick)
+      conn =
+        plainConnection (conf ^. ircServer) (conf ^. ircPort)
+          & realname .~ "Owothia Revströwö"
+          & password .~ (conf ^. ircServerPassword)
+          & logfunc .~ stdoutLogger
+      cfg =
+        defaultInstanceConfig nick
+          & channels .~ ["##tvl"]
+          & handlers %~ (owothiaHandler conf nick state tagger : )
+  runClient conn cfg ()