110 lines
3.4 KiB
Haskell
110 lines
3.4 KiB
Haskell
{-# OPTIONS_GHC -fno-warn-orphans #-}
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{- git-annex output messages, including concurrent output to display regions
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-
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- Copyright 2010-2015 Joey Hess <id@joeyh.name>
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-
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- Licensed under the GNU GPL version 3 or higher.
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-}
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{-# LANGUAGE CPP #-}
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module Messages.Concurrent where
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import Annex
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#ifdef WITH_CONCURRENTOUTPUT
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import Common
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import Types.Messages
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import qualified System.Console.Concurrent as Console
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import qualified System.Console.Regions as Regions
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import Control.Concurrent.STM
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import qualified Data.Text as T
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#endif
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{- Outputs a message in a concurrency safe way.
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-
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- The message may be an error message, in which case it goes to stderr.
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-
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- When built without concurrent-output support, the fallback action is run
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- instead.
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-}
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concurrentMessage :: Bool -> String -> Annex () -> Annex ()
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#ifdef WITH_CONCURRENTOUTPUT
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concurrentMessage iserror msg _ = go =<< consoleRegion <$> Annex.getState Annex.output
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where
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go Nothing
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| otherwise = liftIO $ Console.outputConcurrent msg
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go (Just r) = do
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-- Can't display the error to stdout while
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-- console regions are in use, so set the errflag
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-- to get it to display to stderr later.
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when iserror $ do
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Annex.changeState $ \s ->
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s { Annex.output = (Annex.output s) { consoleRegionErrFlag = True } }
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liftIO $ atomically $ do
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Regions.appendConsoleRegion r msg
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rl <- takeTMVar Regions.regionList
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putTMVar Regions.regionList
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(if r `elem` rl then rl else r:rl)
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#else
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concurrentMessage _ _ fallback = fallback
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#endif
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{- Runs an action in its own dedicated region of the console.
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-
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- The region is closed at the end or on exception, and at that point
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- the value of the region is displayed in the scrolling area above
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- any other active regions.
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-
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- When not at a console, a region is not displayed until the action is
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- complete.
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-}
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inOwnConsoleRegion :: Annex a -> Annex a
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#ifdef WITH_CONCURRENTOUTPUT
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inOwnConsoleRegion a = do
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r <- mkregion
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setregion (Just r)
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eret <- tryNonAsync a `onException` rmregion r
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case eret of
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Left e -> do
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-- Add error message to region before it closes.
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concurrentMessage True (show e) noop
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rmregion r
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throwM e
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Right ret -> do
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rmregion r
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return ret
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where
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-- The region is allocated here, but not displayed until
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-- a message is added to it. This avoids unnecessary screen
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-- updates when a region does not turn out to need to be used.
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mkregion = Regions.newConsoleRegion Regions.Linear ""
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setregion r = Annex.changeState $ \s -> s { Annex.output = (Annex.output s) { consoleRegion = r } }
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rmregion r = do
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errflag <- consoleRegionErrFlag <$> Annex.getState Annex.output
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let h = if errflag then Console.StdErr else Console.StdOut
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Annex.changeState $ \s ->
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s { Annex.output = (Annex.output s) { consoleRegionErrFlag = False } }
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setregion Nothing
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liftIO $ atomically $ do
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t <- Regions.getConsoleRegion r
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unless (T.null t) $
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Console.bufferOutputSTM h t
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Regions.closeConsoleRegion r
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#else
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inOwnConsoleRegion = id
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#endif
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{- The progress region is displayed inline with the current console region. -}
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#ifdef WITH_CONCURRENTOUTPUT
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withProgressRegion :: (Regions.ConsoleRegion -> Annex a) -> Annex a
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withProgressRegion a = do
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parent <- consoleRegion <$> Annex.getState Annex.output
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Regions.withConsoleRegion (maybe Regions.Linear Regions.InLine parent) a
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instance Regions.LiftRegion Annex where
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liftRegion = liftIO . atomically
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#endif
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