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|
{-# LANGUAGE TupleSections, FlexibleContexts #-}
-----------------------------------------------------------------------------
-- |
-- Module : Plugins.Monitors.Accordion
-- Copyright : (c) 2024 Enrico Maria De Angelis
-- License : BSD-style (see LICENSE)
--
-- Maintainer : Enrico Maria De Angelis <enricomaria.dean6elis@gmail.com>
-- Stability : unstable
-- Portability : unportable
--
-- A plugin to group adjacent plugins and make them, as a whole, shrinkable to
-- an alternate text upon clicking.
--
-----------------------------------------------------------------------------
module Xmobar.Plugins.Accordion (defaultTuning, makeAccordion, Tuning(..)) where
import Control.Concurrent.Async (withAsync)
import Control.Exception (finally)
import Control.Monad (forever, join, when)
import Control.Monad.IO.Class (liftIO)
import Control.Monad.Reader (runReaderT, ask)
import Control.Monad.State.Strict (evalStateT, get, modify')
import Data.IORef (atomicModifyIORef', newIORef, readIORef)
import Data.Maybe (isJust)
import System.Directory (removeFile)
import System.Exit (ExitCode(..))
import System.Process (readProcessWithExitCode)
import Xmobar.Run.Exec (Exec(..), tenthSeconds)
-- TODO: Ideally, I'd have just `Accordion`, and not `Tuning`, but since
-- `Accordion` is polymorphic, I can't have a `defaultAccordion` constructor
-- with `plugins = []`, because that leaves `a` undetermined.
-- So I have move all non-polymorphic typed members in `Tuning`, allowing for
-- default values at least for those members.
data Accordion a = Accordion {
tuning :: Tuning
, plugins :: [a]
} deriving (Show, Read)
makeAccordion :: Exec a => Tuning -> [a] -> Accordion a
makeAccordion t rs = Accordion { tuning = t, plugins = rs }
data Tuning = Tuning {
alias' :: String
, initial :: Bool
, expand :: String
, shrink :: String
} deriving (Read, Show)
defaultTuning :: Tuning
defaultTuning = Tuning {
alias' = "accordion"
, initial = True
, expand = "<>"
, shrink = "><"
}
instance (Exec a, Read a, Show a) => Exec (Accordion a) where
alias (Accordion Tuning { alias' = name } _) = name
start (Accordion Tuning { initial = initial'
, expand = expand'
, shrink = shrink' }
runnables)
cb = do
clicked <- newIORef Nothing
(_, n, _) <- readProcessWithExitCode "uuidgen" [] ""
let pipe = "/tmp/accordion-" ++ removeLinebreak n
(_, _, _) <- readProcessWithExitCode "mkfifo" [pipe] ""
withAsync (forever $ do (ret, _, _) <- readProcessWithExitCode "cat" [pipe] ""
case ret of
ExitSuccess -> atomicModifyIORef' clicked (const (Just (), ()))
ExitFailure _ -> error "how is this possible?")
(const $ do
srefs <- mapM (newIORef . const "") runnables
foldr (\(runnable, sref) acc -> withAsync (start runnable (writeToRef sref)) (const acc))
(forever (do liftIO (tenthSeconds 1)
clicked' <- liftIO $ readIORef clicked
when (isJust clicked')
(do liftIO $ clear clicked
modify' not)
b <- get
if b then loop pipe else liftIO $ cb (click pipe expand'))
`runReaderT` srefs `evalStateT` initial')
(zip runnables srefs))
`finally` removeFile pipe
where
click file icon = "<action=`echo 1 > " ++ file ++ "`>" ++ icon ++ "</action>"
clear = (`atomicModifyIORef'` const (Nothing, ()))
removeLinebreak = init
writeToRef strRef = atomicModifyIORef' strRef . const . (,())
loop p = do
srefs <- ask
text <- join <$> mapM (liftIO . readIORef) srefs
liftIO $ cb $ text ++ click p shrink'
|
