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Logs: freenode/#haskell

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2021-03-26 11:49:23 → royal_screwup21 joins (52254809@gateway/web/cgi-irc/kiwiirc.com/ip.82.37.72.9)
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2021-03-26 11:58:38 <ClaudiusMaximus> zclod: runSTUArray is the wrong thing to use in that position, because it creates a new 's' dataflow thread which is not allowed to escape its scope
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2021-03-26 12:02:31 → ddellacosta joins (~ddellacos@86.106.143.66)
2021-03-26 12:03:16 <ClaudiusMaximus> zclod: I think you want something more like readMemory :: C s (); readMemory = do{ s <- get ; x' <- lift $ readArray (_y s) 0 ; put s{ _x = x' } }
2021-03-26 12:03:29 <ClaudiusMaximus> zclod: which you can sprinkle with lens if you like
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2021-03-26 12:30:34 → invaser joins (~Thunderbi@31.148.23.125)
2021-03-26 12:31:06 <invaser> Hi, is there a version of `readFile` that returns Maybe String and not String? I'd like to check in some way if file exists or not
2021-03-26 12:31:57 × Mrbuck quits (~Mrbuck@gateway/tor-sasl/mrbuck) (Ping timeout: 240 seconds)
2021-03-26 12:32:18 → stree joins (~stree@68.36.8.116)
2021-03-26 12:33:10 <dminuoso> invaser: That's not a useful thing to do.
2021-03-26 12:33:11 × lateef quits (~lateef@171.121.237.35.bc.googleusercontent.com) (Quit: lateef)
2021-03-26 12:33:20 <ovanr> you can use System.Directory.doesFileExist function
2021-03-26 12:33:21 <dminuoso> It'd be a toctou race.
2021-03-26 12:33:35 <dminuoso> Just use `readFile` and catch the exception.
2021-03-26 12:34:19 <invaser> Oh, ok. Actually I haven't tried catching exceptions before
2021-03-26 12:34:32 <merijn> @hoogle try
2021-03-26 12:34:32 <lambdabot> Control.Exception try :: Exception e => IO a -> IO (Either e a)
2021-03-26 12:34:32 <lambdabot> Control.Exception.Base try :: Exception e => IO a -> IO (Either e a)
2021-03-26 12:34:32 <lambdabot> System.Directory.Internal.Prelude try :: Exception e => IO a -> IO (Either e a)
2021-03-26 12:34:37 <merijn> @hoogle catch
2021-03-26 12:34:37 <lambdabot> Control.Exception catch :: Exception e => IO a -> (e -> IO a) -> IO a
2021-03-26 12:34:38 <lambdabot> Control.Exception.Base catch :: Exception e => IO a -> (e -> IO a) -> IO a
2021-03-26 12:34:38 <lambdabot> GHC.IO catch :: Exception e => IO a -> (e -> IO a) -> IO a
2021-03-26 12:35:07 <merijn> invaser: You can catch it using try and then converting the "Either" into Maybe should be straightforward
2021-03-26 12:35:12 → Gurkenglas joins (~Gurkengla@unaffiliated/gurkenglas)
2021-03-26 12:35:27 <invaser> Yeah, thanks a lot
2021-03-26 12:35:42 × borne quits (~fritjof@200116b864d14f00f7ed9fd86a2491f0.dip.versatel-1u1.de) (Ping timeout: 258 seconds)
2021-03-26 12:36:21 <merijn> @hoogle IOError
2021-03-26 12:36:21 <lambdabot> Prelude type IOError = IOException
2021-03-26 12:36:21 <lambdabot> System.IO.Error type IOError = IOException
2021-03-26 12:36:21 <lambdabot> GHC.IO.Exception type IOError = IOException
2021-03-26 12:36:47 <merijn> Probably wanna dig into System.IO/Syste.IO.Error to make sure you only catch doesNotExist errors
2021-03-26 12:36:50 ← Shadorain parts (uid453914@gateway/web/irccloud.com/x-kxlgtieracwagtls) ()
2021-03-26 12:37:25 → borne joins (~fritjof@83.135.94.174)
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2021-03-26 12:52:16 hackage morley-prelude 0.4.0 - A custom prelude used in Morley https://hackage.haskell.org/package/morley-prelude-0.4.0 (pasqu4le)
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2021-03-26 13:04:07 megaTherion_ is now known as megaTherion
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2021-03-26 13:07:48 <maerwald> invaser: what about broken symlinks?
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