xmonad-config/lib/Xmobar/Plugins/Common.hs

{-# LANGUAGE OverloadedStrings #-}

module Xmobar.Plugins.Common
  ( colorText
  , startListener
  , procSignalMatch
  , na
  , fromSingletonVariant
  , withDBusClientConnection
  , Callback
  , Colors (..)
  , displayMaybe
  , displayMaybe'
  , xmobarFGColor
  )
where

import DBus
import DBus.Client
import Data.Internal.DBus
import RIO
import qualified RIO.Text as T
import XMonad.Hooks.DynamicLog (xmobarColor)

-- use string here since all the callbacks in xmobar use strings :(
type Callback = String -> IO ()

data Colors = Colors
  { colorsOn :: T.Text
  , colorsOff :: T.Text
  }
  deriving (Eq, Show, Read)

startListener
  :: (MonadUnliftIO m, SafeClient c, IsVariant a)
  => MatchRule
  -> (c -> m [Variant])
  -> ([Variant] -> SignalMatch a)
  -> (a -> m T.Text)
  -> Callback
  -> c
  -> m ()
startListener rule getProp fromSignal toColor cb client = do
  reply <- getProp client
  displayMaybe cb toColor $ fromSingletonVariant reply
  void $ addMatchCallback rule (procMatch . fromSignal) client
  where
    procMatch = procSignalMatch cb toColor

procSignalMatch
  :: MonadUnliftIO m => Callback -> (a -> m T.Text) -> SignalMatch a -> m ()
procSignalMatch cb f = withSignalMatch (displayMaybe cb f)

colorText :: Colors -> Bool -> T.Text -> T.Text
colorText Colors {colorsOn = c} True = xmobarFGColor c
colorText Colors {colorsOff = c} False = xmobarFGColor c

xmobarFGColor :: T.Text -> T.Text -> T.Text
xmobarFGColor c = T.pack . xmobarColor (T.unpack c) "" . T.unpack

na :: T.Text
na = "N/A"

displayMaybe :: MonadUnliftIO m => Callback -> (a -> m T.Text) -> Maybe a -> m ()
displayMaybe cb f = (liftIO . cb . T.unpack) <=< maybe (return na) f

displayMaybe' :: MonadUnliftIO m => Callback -> (a -> m ()) -> Maybe a -> m ()
displayMaybe' cb = maybe (liftIO $ cb $ T.unpack na)

withDBusClientConnection
  :: (MonadUnliftIO m, SafeClient c)
  => Callback
  -> Utf8Builder
  -> (c -> RIO SimpleApp ())
  -> m ()
withDBusClientConnection cb name f = do
  logOpts <- setLogVerboseFormat True . setLogUseTime True . setLogFormat pre <$> logOptionsHandle stderr False
  withLogFunc logOpts $ \lf -> do
    env <- mkSimpleApp lf Nothing
    runRIO env $ displayMaybe' cb f =<< getDBusClient
  where
    pre rest = "[" <> name <> " plugin] " <> rest