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Logs: liberachat/#haskell

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2021-07-19 13:30:45 × peterhil quits (~peterhil@mobile-access-b04801-219.dhcp.inet.fi) (Ping timeout: 258 seconds)
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2021-07-19 13:34:21 × merijn quits (~merijn@83-160-49-249.ip.xs4all.nl) (Ping timeout: 268 seconds)
2021-07-19 13:34:58 <Boarders> is there a variant combinator in megaparsec that is like: do {t <- takeWhileP Nothing (/= '\n'); char '\n'; pure t}
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2021-07-19 13:40:37 <tdammers> https://hackage.haskell.org/package/parser-combinators-1.3.0/docs/Control-Applicative-Combinators.html#v:manyTill maybe?
2021-07-19 13:41:19 <dmj`> lechner: did you try using `catch`
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2021-07-19 13:44:40 <Boarders> manyTill is very related but not quite the same
2021-07-19 13:45:32 <lechner> dmj`: i'm still reading, and working on my general Haskell learning curve
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2021-07-19 13:51:21 <lechner> dmj`: but i do have working program (which i wrote) where I could try your suggestion. how do i use catch, please? https://salsa.debian.org/lintian/kickoff/-/blob/master/Collect.hs#L82
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2021-07-19 14:06:39 <tzh> hey so i'm working on a haskell game; does anybody have any suggestions for an input library that would work well? previously i've used reactive-banana, which worked well enough even if its FRP nature made it a little clunky for use in a highly-interactive program. i saw some people mention using arrowized FRP libraries likes Yampa/dunai but that seems more like something to use for physics integration than for things like 'how to click on
2021-07-19 14:06:40 <tzh> a menu'
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2021-07-19 14:14:12 <kuribas> tzh: reactive-banana isn't an input library, it's a FRP library.
2021-07-19 14:14:20 <kuribas> You can use it with any UI library.
2021-07-19 14:15:21 <maerwald> SDL2?
2021-07-19 14:15:37 <[exa]> tzh: immediate-mode GUIs (google imgui) are priceless for games, except I don't know if we have any for haskell yet
2021-07-19 14:15:51 <tzh> kuribas: okay yes it's not a raw input-catching library; i'm actually using glfw for that. what i'm looking for is an input _processing_ library, to impose some order onto my input flow so it's not a bunch of ad-hoc garbage
2021-07-19 14:16:18 <kuribas> tzh: reactive-banana should be fine.
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2021-07-19 14:21:02 <tzh> the main issue with reactive-banana is that it gets pretty clunky since it only runs in IO and thus can never directly run actual buffer writes... (well, okay, there are ways but that becomes a mess of running all input-processing code inside a render monad, with an unknown timing to my render loop). which means i need to have its output actions queue render actions like buffer allocations/writes, and then outside of the event loop pull
2021-07-19 14:21:03 <tzh> them out so they can actually be run, which seems a little clunky and counter to the FRP experience, but i don't really see how that could be avoided given how opengl rendering works. so really i'd just like for that experience to be a bit smoother
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2021-07-19 14:49:52 allbery_b is now known as geekosaur
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2021-07-19 15:18:00 <dmj`> lechner: do { result <- try (evaluate (decompress bytes)) :: IO (Either SomeException ByteString); case result of { Left e -> print e; Right bytes -> print (length bytes) } }
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2021-07-19 15:22:29 <Las[m]> Question about bound threads: Will unbound threads use an OS thread created by forkOS?
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2021-07-19 15:26:24 <monochrom> Probably in an ideal world shouldn't matter but in practice the GHC implementers wouldn't troll themselves by doing that.
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2021-07-19 15:28:14 <monochrom> In practice there is pure Haskell code that can hold up an OS thread uninterruptible. Now what can you do when the rightful owner of the OS thread needs it?
2021-07-19 15:29:51 × Vajb quits (~Vajb@hag-jnsbng11-58c3a1-224.dhcp.inet.fi) (Read error: Connection reset by peer)
2021-07-19 15:30:03 <c_wraith> honestly, that's not a very important edge case, given that the same pure code that will hold a thread uninterruptably will also block garbage collection, and therefore the entire program via stop-the-world GC
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2021-07-19 15:31:12 <c_wraith> If you write a loop that does that, you get what you deserve whether bound threads are involved or not.
2021-07-19 15:31:51 <c_wraith> (this is why mueval starts new processes, not just threads)
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2021-07-19 15:43:28 <jumper149> The diagram here: https://wiki.haskell.org/Typeclassopedia
2021-07-19 15:43:49 <jumper149> It is missing the superclass `Alternative` of `MonadPlus` :(
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