blob: bb949af03c1e604e3f97bba4fdb19d32b44b240c (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
|
{-# OPTIONS_GHC -fno-warn-orphans #-}
{- git-annex output messages, including concurrent output to display regions
-
- Copyright 2010-2015 Joey Hess <id@joeyh.name>
-
- Licensed under the GNU GPL version 3 or higher.
-}
{-# LANGUAGE CPP #-}
module Messages.Concurrent where
import Common
import Annex
import Types.Messages
#ifdef WITH_CONCURRENTOUTPUT
import qualified System.Console.Concurrent as Console
import qualified System.Console.Regions as Regions
import Control.Concurrent.STM
import qualified Data.Text as T
#endif
{- Outputs a message in a concurrency safe way.
-
- The message may be an error message, in which case it goes to stderr.
-
- When built without concurrent-output support, the fallback action is run
- instead.
-}
concurrentMessage :: Bool -> String -> Annex () -> Annex ()
#ifdef WITH_CONCURRENTOUTPUT
concurrentMessage iserror msg _ = go =<< consoleRegion <$> Annex.getState Annex.output
where
go Nothing
| iserror = liftIO $ Console.errorConcurrent msg
| otherwise = liftIO $ Console.outputConcurrent msg
go (Just r) = do
-- Can't display the error to stdout while
-- console regions are in use, so set the errflag
-- to get it to display to stderr later.
when iserror $ do
Annex.changeState $ \s ->
s { Annex.output = (Annex.output s) { consoleRegionErrFlag = True } }
liftIO $ Regions.appendConsoleRegion r msg
#else
concurrentMessage _ _ fallback = fallback
#endif
{- Runs an action in its own dedicated region of the console.
-
- The region is closed at the end or on exception, and at that point
- the value of the region is displayed in the scrolling area above
- any other active regions.
-
- When not at a console, a region is not displayed until the action is
- complete.
-}
inOwnConsoleRegion :: Annex a -> Annex a
#ifdef WITH_CONCURRENTOUTPUT
inOwnConsoleRegion a = do
r <- mkregion
setregion (Just r)
eret <- tryNonAsync a `onException` rmregion r
case eret of
Left e -> do
-- Add error message to region before it closes.
concurrentMessage True (show e) noop
rmregion r
throwM e
Right ret -> do
rmregion r
return ret
where
mkregion = Regions.openConsoleRegion Regions.Linear
setregion r = Annex.changeState $ \s -> s { Annex.output = (Annex.output s) { consoleRegion = r } }
rmregion r = do
errflag <- consoleRegionErrFlag <$> Annex.getState Annex.output
let h = if errflag then Console.StdErr else Console.StdOut
Annex.changeState $ \s ->
s { Annex.output = (Annex.output s) { consoleRegionErrFlag = False } }
setregion Nothing
liftIO $ atomically $ do
t <- Regions.getConsoleRegion r
unless (T.null t) $
Console.bufferOutputSTM h t
Regions.closeConsoleRegion r
#else
inOwnConsoleRegion = id
#endif
#ifdef WITH_CONCURRENTOUTPUT
instance Regions.LiftRegion Annex where
liftRegion = liftIO . atomically
#endif
|
