[xmonad] runOrRaiseNext lost functionality in xmonad 0.9?
gwern0 at gmail.com
Mon Jul 12 00:57:00 EDT 2010
On Sun, Jul 11, 2010 at 7:53 PM, Joseph Garvin
<joseph.h.garvin at gmail.com> wrote:
> If I just put "firefox" then it works, but "firefox || firefox" does
> not, leading me to believe the command is no longer executed through
> the shell. Is this intentional?
This is documented in the haddocks:
-- | 'action' is an executable to be run via 'safeSpawnProg' (of
"XMonad.Util.Run") if the Window cannot be found.
-- Presumably this executable is the same one that you were looking for.
On Sun, Jul 11, 2010 at 10:30 PM, Adam Vogt <vogt.adam at gmail.com> wrote:
> can call out to the shell to check with 'which' with the following
> expression you can put where you had runOrRaiseNext:
> (_,paths,_) <- io $ readProcessWithExitCode
> -- run the first one that exists
> case lines paths of
> firefox : _ -> runOrRaiseNext firefox ...
> _ -> return () -- or something else?
Another solution is to look at the current code:
runOrRaise = raiseMaybe ○ safeSpawnProg
XMonad.Util.Run.safeSpawnProg is defined as:
safeSpawnProg ∷ MonadIO m ⇒ FilePath → m ()
safeSpawnProg = flip safeSpawn 
In comparison, XMonad.Util.Run.unsafeSpawn:
unsafeSpawn ∷ MonadIO m ⇒ String → m ()
unsafeSpawn = spawn
And String == FilePath, so these type signatures are identical.
So to restore the old behavior is as simple as swapping B for A:
runOrRaise' = raiseMaybe ○ unsafeSpawn
I thought this was all clear in the haddocks, but I guess not. I've
expanded the haddock for runOrRaise to point out raiseMaybe's greater
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