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authorSibi Prabakaran <sibi@psibi.in>2020-05-02 18:37:58 +0530
committerjao <jao@gnu.org>2020-05-02 16:34:52 +0100
commit68ac4d3ae6f37a2f73109f65f67e0b0d209696f0 (patch)
tree490ebb9a927ec26c2ca8eb6bb707ad2217f8f271 /src/Xmobar/System/Utils.hs
parentb7a3d674581720bfb63bf73cae8368ebbad81004 (diff)
downloadxmobar-68ac4d3ae6f37a2f73109f65f67e0b0d209696f0.tar.gz
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Update stderr and the bar on receiving exception
Diffstat (limited to 'src/Xmobar/System/Utils.hs')
-rw-r--r--src/Xmobar/System/Utils.hs13
1 files changed, 12 insertions, 1 deletions
diff --git a/src/Xmobar/System/Utils.hs b/src/Xmobar/System/Utils.hs
index 636436b..59c485c 100644
--- a/src/Xmobar/System/Utils.hs
+++ b/src/Xmobar/System/Utils.hs
@@ -17,7 +17,7 @@
------------------------------------------------------------------------------
-module Xmobar.System.Utils (expandHome, changeLoop)
+module Xmobar.System.Utils (expandHome, changeLoop, onSomeException)
where
import Control.Monad
@@ -25,6 +25,7 @@ import Control.Concurrent.STM
import System.Environment
import System.FilePath
+import Control.Exception
expandHome :: FilePath -> IO FilePath
expandHome ('~':'/':path) = fmap (</> path) (getEnv "HOME")
@@ -39,3 +40,13 @@ changeLoop s f = atomically s >>= go
new <- s
guard (new /= old)
return new)
+
+-- | Like 'finally', but only performs the final action if there was an
+-- exception raised by the computation.
+--
+-- Note that this implementation is a slight modification of
+-- onException function.
+onSomeException :: IO a -> (SomeException -> IO b) -> IO a
+onSomeException io what = io `catch` \e -> do _ <- what e
+ throwIO (e :: SomeException)
+