2022/12/22

2022-12-22 00:01:20 +0000 <monochrom> haha
2022-12-22 00:01:44 +0000 <monochrom> I was also thinking: Yoda p b a = Yoneda p a b
2022-12-22 00:02:12 +0000 <monochrom> "contramap this you must"
2022-12-22 00:03:04 +0000[Leary](~Leary]@user/Leary/x-0910699) (Remote host closed the connection)
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2022-12-22 00:04:21 +0000[Leary](~Leary]@user/Leary/x-0910699)
2022-12-22 00:04:30 +0000 <EvanR> a contravariant functor is a functor as explained by yoda
2022-12-22 00:05:09 +0000TonyStone(~TonyStone@cpe-74-76-57-186.nycap.res.rr.com)
2022-12-22 00:09:48 +0000 <monochrom> :)
2022-12-22 00:12:37 +0000 <hpc> actually, does that mean a bidirectional mapping... contradicts itself? :D
2022-12-22 00:13:17 +0000jakalx(~jakalx@base.jakalx.net) (Error from remote client)
2022-12-22 00:13:41 +0000 <geekosaur> only if it actually says anything?
2022-12-22 00:13:44 +0000 <EvanR> doesn't matter, george lucas will just retcon it
2022-12-22 00:13:58 +0000 <EvanR> or disney
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2022-12-22 01:44:48 +0000 <dgpratt[m]> is there a way to "lift" a function over a newtype wrapper? I mean without doing an explicit unwrap/wrap sequence?
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2022-12-22 01:48:55 +0000 <EvanR> :t coerce . f . coerce
2022-12-22 01:48:56 +0000 <lambdabot> error:
2022-12-22 01:48:56 +0000 <lambdabot> • Variable not in scope: coerce :: b1 -> c
2022-12-22 01:48:56 +0000 <lambdabot> • Perhaps you meant ‘coerced’ (imported from Control.Lens)
2022-12-22 01:49:28 +0000 <EvanR> :t coerced
2022-12-22 01:49:29 +0000 <lambdabot> (Profunctor p, Functor f, Coercible s a, Coercible t b) => p a (f b) -> p s (f t)
2022-12-22 01:49:51 +0000foul_owl(~kerry@157.97.134.158)
2022-12-22 01:53:16 +0000 <dgpratt[m]> very interesting, thanks EvanR
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2022-12-22 02:27:34 +0000 <jackdk> EvanR: from `bifunctors:Data.Bifunctor.Joker`: `newtype Joker g a b = Joker :: { runJoker :: g b }`
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2022-12-22 03:36:12 +0000Inst_(~Inst@2601:6c4:4081:54f0:5c02:2b13:b462:4536)
2022-12-22 03:36:15 +0000Inst_Inst
2022-12-22 03:36:32 +0000 <Inst> did anyone else read "A Pythonista tries Haskell?"
2022-12-22 03:39:00 +0000codaraxis___(~codaraxis@user/codaraxis)
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2022-12-22 03:50:08 +0000 <EvanR> :k Data.Bifunctor.Joker
2022-12-22 03:50:09 +0000 <lambdabot> error:
2022-12-22 03:50:09 +0000 <lambdabot> Not in scope: type constructor or class ‘Data.Bifunctor.Joker’
2022-12-22 03:50:09 +0000 <lambdabot> No module named ‘Data.Bifunctor’ is imported.
2022-12-22 03:53:33 +0000 <Inst> Well, I'm a Haskell baby that tried Python; anyone want impressions?
2022-12-22 03:54:08 +0000 <Clint> i do not
2022-12-22 03:54:49 +0000 <EvanR> not really
2022-12-22 03:55:00 +0000 <EvanR> oh, I thought you meant about python
2022-12-22 03:55:51 +0000 <Inst> https://bytes.yingw787.com/posts/2020/01/30/a_review_of_haskell/ that was the pythonista tries Haskell stuff
2022-12-22 03:55:59 +0000 <Inst> for me, it basically comes down to, Python has great libs
2022-12-22 03:56:03 +0000 <Inst> the coding style is shit, though
2022-12-22 03:56:20 +0000 <Inst> and Haskell needs more EDSLs and should bother to teach an imperative style beforehand
2022-12-22 03:57:13 +0000 <Inst> assignment and hidden state is ugly
2022-12-22 03:57:24 +0000 <Inst> but really, great libs
2022-12-22 03:57:31 +0000 <Inst> nothing new was said here
2022-12-22 03:57:33 +0000 <EvanR> luckily this is haskell
2022-12-22 03:57:40 +0000 <EvanR> and not python
2022-12-22 03:58:51 +0000 <Inst> I mean I've always wanted to investigate Python to understand how they ended up being the second most popular language on the planet, after JS
2022-12-22 03:58:59 +0000 <Inst> it's incredible the things they get right
2022-12-22 03:59:07 +0000 <Inst> including how absolutely brain-dead this textbook I bought is
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2022-12-22 04:11:42 +0000beefbambi(~beefbambi@183.82.207.16)
2022-12-22 04:13:21 +0000troydm(~troydm@host-176-37-124-197.b025.la.net.ua)
2022-12-22 04:14:11 +0000 <monochrom> Libraries are caused by network effects (after you chase down multiple intermediate causes along multiple pathways).
2022-12-22 04:14:37 +0000 <monochrom> One day you will be surprised (or not) to find that almost every popularity is caused by networking effects.
2022-12-22 04:14:59 +0000 <monochrom> And yes it also means randomized initial conditions.
2022-12-22 04:17:01 +0000 <monochrom> If you already know about "history is written by victors", consider also "success stories are written by victors".
2022-12-22 04:18:19 +0000 <Inst> yeah, i'm the one to call Python the ultimate network effects library
2022-12-22 04:18:32 +0000 <Inst> it doesn't matter if the language is flawed, as long as it can get marketed and build a massive ecosystem on top of it
2022-12-22 04:18:48 +0000Guest17(~Guest17@2601:642:c000:2670:9a63:d40c:964:f8c9)
2022-12-22 04:19:09 +0000 <Inst> the more interesting thing is, well, libraries tend to comprise a kind of EDSL, and Haskell actually is a better EDSL language
2022-12-22 04:19:16 +0000 <Inst> since we don't have parens, in certain ways, we're better than Lisps
2022-12-22 04:20:06 +0000 <Inst> Haskell marketed as an EDSL language, though, gets into the m-word problem, and it sort of makes me think that not being able to navigate the m-word problem is almost by design
2022-12-22 04:20:41 +0000 <Inst> see this guy:
2022-12-22 04:20:42 +0000 <Inst> https://hasura.io/blog/parser-combinators-walkthrough/#fn1
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2022-12-22 04:32:03 +0000 <EvanR> m-word problem sounds like something from abstract algebra
2022-12-22 04:33:01 +0000fizbin(~fizbin@user/fizbin)
2022-12-22 04:34:29 +0000 <zzz> @pl h (g (f a) a)
2022-12-22 04:34:29 +0000 <lambdabot> h (g (f a) a)
2022-12-22 04:34:55 +0000 <zzz> wasn't there a command to further explore this kind of expressions?
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2022-12-22 04:41:45 +0000freeside(~mengwong@103.252.202.159)
2022-12-22 04:41:48 +0000 <monochrom> heh
2022-12-22 04:42:22 +0000 <zzz> was it yahb maybe?... can't recall
2022-12-22 04:42:23 +0000 <monochrom> zzz, you want something like @pl \h g f a -> h (g (f a) a)
2022-12-22 04:43:06 +0000 <zzz> oi that'll do! thanks
2022-12-22 04:43:38 +0000 <zzz> not that it was that useful...
2022-12-22 04:44:27 +0000 <Inst> yeah, usual monoid / monad joke
2022-12-22 04:46:17 +0000 <zzz> this year i learned that APL-like languages use "monadic" and "dyadic" to refer to arity
2022-12-22 04:46:30 +0000 <zzz> that confused me
2022-12-22 04:46:33 +0000 <zzz> for a brief moment
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2022-12-22 04:48:34 +0000 <monochrom> Yes, consider "monadic second-order logic" :)
2022-12-22 04:48:46 +0000Vajb(~Vajb@2001:999:250:c9:8588:6e93:7809:7816)
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2022-12-22 04:54:54 +0000 <zzz> interesting
2022-12-22 04:55:38 +0000AlexNoo_(~AlexNoo@94.233.241.57)
2022-12-22 04:57:09 +0000AlexNoo__(~AlexNoo@94.233.241.57)
2022-12-22 04:59:21 +0000 <EvanR> I saw something called a Dyad in old dusty physics tomes. It only stands to reason there are Monads
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2022-12-22 05:03:07 +0000 <mauke> I once saw a dye ad
2022-12-22 05:04:38 +0000AlexNoo_(~AlexNoo@94.233.241.57)
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2022-12-22 05:06:48 +0000 <EvanR> Not to be confused with a Dryad
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2022-12-22 05:25:37 +0000 <maerwald> can exceptions leak out of unsafeInterleaveIO?
2022-12-22 05:25:53 +0000beefbambi(~beefbambi@183.82.207.16)
2022-12-22 05:26:59 +0000 <maerwald> as in: unsafeInterleaveIO $ handle (\e -> ...) action
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2022-12-22 05:44:03 +0000AkechiShiro(~licht@user/akechishiro)
2022-12-22 05:45:44 +0000 <monochrom> You have handle around action directly, so no leak.
2022-12-22 05:46:10 +0000 <monochrom> Leak is when handle (\e -> ...) (unsafeInterleaveIO action) heh
2022-12-22 05:57:03 +0000L29Ah(~L29Ah@wikipedia/L29Ah)
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2022-12-22 06:41:12 +0000 <EvanR> because unsafeInterleaveIO eats all exceptions?
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2022-12-22 06:44:15 +0000 <opqdonut> EvanR: no, because the IO gets deferred and is only run later when the result is forced, but then handle has already finished
2022-12-22 06:45:12 +0000 <EvanR> oh
2022-12-22 06:45:38 +0000beefbambi(~beefbambi@2401:4900:230d:f57c:538c:d7cc:50c0:e377)
2022-12-22 06:46:33 +0000 <opqdonut> cf. withFile "/etc/passwd" ReadMode hGetContents
2022-12-22 06:46:57 +0000 <opqdonut> if you try using the result of that, you get "illegal operation (delayed read on closed handle)"
2022-12-22 06:47:10 +0000takuan(~takuan@178-116-218-225.access.telenet.be)
2022-12-22 06:48:11 +0000 <maerwald> monochrom: I don't think it works as expected when threads are involved and the value is accessed in a thread
2022-12-22 06:51:03 +0000 <maerwald> e.g. if your handler re-throws
2022-12-22 06:51:18 +0000 <maerwald> then your thread will crash instead of your main
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2022-12-22 06:52:57 +0000 <monochrom> Ugh /etc/passwd is a bad example because it's world-readable, you won't have a problem.
2022-12-22 06:54:39 +0000 <opqdonut> right yeah I was demonstrating a resource leak, not an exception
2022-12-22 06:55:15 +0000 <monochrom> Ah sorry, you're right, the hClose in withFile.
2022-12-22 06:55:20 +0000 <opqdonut> but if you try that with a non-readable file you'll get an exception from openFile within withFile, the hGetContents won't get to run
2022-12-22 06:57:18 +0000 <monochrom> maerwald: That's my expectation.
2022-12-22 06:57:24 +0000 <maerwald> My issue is not with streaming. I can't pass an IO action, because it would be executed multiple times. Fully evaluating the value is not desired, because not all code-paths actually need it. Changing that would be a major refactor.
2022-12-22 06:58:14 +0000 <maerwald> but yeah, the error handling is trash now
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2022-12-22 08:03:22 +0000 <Unhammer> Is there a wasmer lib (like https://github.com/dirkschumacher/wasmr#example ) for haskell?
2022-12-22 08:04:20 +0000tromp(~textual@92-110-219-57.cable.dynamic.v4.ziggo.nl)
2022-12-22 08:06:07 +0000 <Inst> EvanR: the Witcher type, the Warcraft 3 type, or the Greek mythology type?
2022-12-22 08:10:30 +0000lortabac(~lortabac@2a01:e0a:541:b8f0:f8ed:343d:34ac:2e79)
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2022-12-22 08:16:46 +0000 <Hecate> int.h>)
2022-12-22 08:16:54 +0000 <Hecate> https://gustedt.wordpress.com/2022/12/18/checked-integer-arithmetic-in-the-prospect-of-c23/
2022-12-22 08:17:02 +0000 <Hecate> that article is interesting from a correctness perspective
2022-12-22 08:17:33 +0000 <Hecate> I'll probably write bindings to offer these operations in Haskell-land
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2022-12-22 09:12:31 +0000 <ArtsAndLeisure> Hi folks! I was wondering: what is the current best practice for benchmarking Wai applications? Thanks!
2022-12-22 09:13:39 +0000 <Hecate> ArtsAndLeisure: locust ;-D
2022-12-22 09:14:00 +0000 <Hecate> now if you want profiling, do you want time profiling or space profiling?
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2022-12-22 09:21:04 +0000 <ArtsAndLeisure> I want it all! But currently space is the most relevant for us.
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2022-12-22 09:26:33 +0000 <Hecate> ArtsAndLeisure: do you know how to enable profiling?
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2022-12-22 12:45:34 +0000 <albet70> Inst, wang yin is a famous person lol, I don't know he writed an article about haskell
2022-12-22 12:45:55 +0000 <Inst> what's the name order again?
2022-12-22 12:46:04 +0000 <Inst> wang, ying, or ying, wang?
2022-12-22 12:46:13 +0000 <Inst> wang, ying seems more probable
2022-12-22 12:47:09 +0000 <albet70> my mistake, the author is ying wang, not yin wang
2022-12-22 12:47:56 +0000 <albet70> the chinese name's order is the last name come first
2022-12-22 12:48:41 +0000 <albet70> so Ying Wang's Chinese name should be Wang Ying
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2022-12-22 14:35:39 +0000 <stefan-_> whats the preferred way/library to fetch xml from an http endpoint and parse it?
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2022-12-22 15:09:49 +0000 <maerwald[m]> That would be the time to look for a new job
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2022-12-22 16:51:40 +0000 <kjlid[m]> https://paste.tomsmeding.com/Gaojhd7w How would I do something like this? The use-case is that I have some URIs stored in a database and I would like to get them out as Text.URI.URIs
2022-12-22 16:51:46 +0000 <Jadesheit[m]> @src foldr
2022-12-22 16:51:46 +0000 <lambdabot> foldr f z [] = z
2022-12-22 16:51:46 +0000 <lambdabot> foldr f z (x:xs) = f x (foldr f z xs)
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2022-12-22 17:07:13 +0000 <monochrom> kjlid[m]: Looks like it should be EntryURI <$> mkURI str
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2022-12-22 17:08:01 +0000 <monochrom> replace the whole "pure $ EntryURI $ mkURI str" by that.
2022-12-22 17:08:38 +0000 <kjlid[m]> No instance for (Control.Monad.Catch.MonadThrow Ok)
2022-12-22 17:08:38 +0000 <kjlid[m]> arising from a use of ‘mkURI’
2022-12-22 17:09:00 +0000 <monochrom> What is the type of mkURI?
2022-12-22 17:09:02 +0000Unicorn_Princess(~Unicorn_P@user/Unicorn-Princess/x-3540542)
2022-12-22 17:09:26 +0000 <kjlid[m]> mkURI :: MonadThrow m => Text -> m URI
2022-12-22 17:09:40 +0000 <mauke> :t maybe
2022-12-22 17:09:41 +0000 <lambdabot> b -> (a -> b) -> Maybe a -> b
2022-12-22 17:10:06 +0000gnalzo(~gnalzo@2a01:e0a:498:fd50:fcc6:bb5d:489a:ce8c)
2022-12-22 17:10:24 +0000 <mauke> catchUriException str f = maybe (returnError ConversionFailed f "Failed to parse EntryURI") (pure . EntryURI) (mkURI str)
2022-12-22 17:10:27 +0000 <mauke> maybe
2022-12-22 17:11:02 +0000 <kjlid[m]> Where does maybe come from?
2022-12-22 17:11:17 +0000 <kjlid[m]> Oh
2022-12-22 17:11:19 +0000 <kjlid[m]> That's in Prelude
2022-12-22 17:12:34 +0000eikke(~NicolasT@user/NicolasT) (Ping timeout: 260 seconds)
2022-12-22 17:12:37 +0000 <kjlid[m]> Ofcourse that worked. Thanks!
2022-12-22 17:13:13 +0000 <kjlid[m]> I'm still trying to wrap my head around the type system.
2022-12-22 17:13:42 +0000 <mauke> mkURI is (overly) generic in its return type
2022-12-22 17:15:09 +0000 <mauke> since you're not using the ParseException anyway, we can simply treat the 'MonadThrow m' part as Maybe (which is an instance of MonadThrow)
2022-12-22 17:15:27 +0000 <mauke> that is, we treat its type as Text -> Maybe URI
2022-12-22 17:15:40 +0000 <mauke> @src maybe
2022-12-22 17:15:41 +0000 <lambdabot> maybe n _ Nothing = n
2022-12-22 17:15:41 +0000 <lambdabot> maybe _ f (Just x) = f x
2022-12-22 17:16:21 +0000 <kjlid[m]> You just answered the next question I had but I didn't know how to formulate
2022-12-22 17:17:07 +0000 <kjlid[m]> Again, thanks! I think something clicked in my head now
2022-12-22 17:17:24 +0000 <mauke> we don't need to bother with 'catch' since we get to choose the MonadThrow to use, and we know Maybe represents errors as a plain Nothing value
2022-12-22 17:17:33 +0000 <mauke> so we can simply pattern match on it
2022-12-22 17:17:43 +0000 <mauke> (or use a helper function that does the pattern matching, like maybe)
2022-12-22 17:18:14 +0000 <kjlid[m]> Is it rude to ask for an example of how this would be written if I wanted to actually use the ParseException?
2022-12-22 17:18:49 +0000 <kjlid[m]> I don't think I care in this instance but it's always nice to see examples
2022-12-22 17:18:55 +0000 <monochrom> Then you switch to Either ParseException URI
2022-12-22 17:19:10 +0000 <mauke> not sure; I've never used ParseException before
2022-12-22 17:19:29 +0000 <monochrom> And the helper function is "either".
2022-12-22 17:19:35 +0000 <kjlid[m]> Ooh
2022-12-22 17:19:37 +0000 <kjlid[m]> Ofcourse
2022-12-22 17:19:51 +0000 <mauke> monochrom: I don't think that'll work
2022-12-22 17:20:13 +0000 <mauke> says here: e ~ SomeException => MonadThrow (Either e)
2022-12-22 17:20:30 +0000 <monochrom> Hrm that's bad
2022-12-22 17:20:30 +0000 <mauke> so you need some sort of injector into SomeException
2022-12-22 17:20:37 +0000AlexNoo(~AlexNoo@94.233.241.57)
2022-12-22 17:21:57 +0000 <mauke> oh, Either SomeException URI would probably work as is
2022-12-22 17:22:11 +0000 <mauke> but then you'd have to fromException the result and do a dynamic test
2022-12-22 17:22:23 +0000Alex_test(~al_test@94.233.241.57)
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2022-12-22 17:22:39 +0000 <monochrom> I have a feeling though that if someone called it "ParseException" as opposed to "ParseError" they might have made it an instance of Exception.
2022-12-22 17:23:10 +0000 <kjlid[m]> Yeah it is an instance of Exception
2022-12-22 17:23:18 +0000 <kjlid[m]> At least according to https://hackage.haskell.org/package/modern-uri-0.3.6.0/docs/Text-URI.html#t:ParseException
2022-12-22 17:23:44 +0000 <monochrom> But yeah you have to go through SomeException and then downcast.
2022-12-22 17:23:50 +0000beefbambi(~beefbambi@183.82.204.74)
2022-12-22 17:26:08 +0000 <mauke> case mkURI str of { Right uri -> pure (EntryURI uri); Left e | Just pe <- fromException e -> returnError ??? ??? ??? | otherwise -> ??? }
2022-12-22 17:26:13 +0000 <mauke> or something like that
2022-12-22 17:26:21 +0000AlexZenon(~alzenon@94.233.241.57)
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2022-12-22 17:27:38 +0000eikke(~NicolasT@user/NicolasT)
2022-12-22 17:27:40 +0000 <kjlid[m]> Wait I can just use case straight on the return value of mkURI?
2022-12-22 17:27:55 +0000 <mauke> yes
2022-12-22 17:28:01 +0000 <mauke> I mean, that's what 'maybe' is doing, too
2022-12-22 17:29:11 +0000 <kjlid[m]> `Left e | Just pe <- fromException e ->` what syntax is that? I don't think I've seen that one before
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2022-12-22 17:29:19 +0000beefbambi(~beefbambi@183.82.204.74)
2022-12-22 17:30:16 +0000 <mauke> well, it's entirely untested so it might be invalid :-)
2022-12-22 17:30:28 +0000 <mauke> but I meant for it to be a pattern guard
2022-12-22 17:31:31 +0000 <kjlid[m]> No it seems to works if I replace "otherwise" with "_"
2022-12-22 17:31:38 +0000 <kjlid[m]> it seems to work even
2022-12-22 17:31:44 +0000beefbambi(~beefbambi@183.82.204.74) (Read error: Connection reset by peer)
2022-12-22 17:32:02 +0000 <mauke> _ shouldn't work after |
2022-12-22 17:32:08 +0000 <mauke> https://www.haskell.org/onlinereport/haskell2010/haskellch3.html#x8-460003.13
2022-12-22 17:32:16 +0000 <mauke> "pattern guards are of the form p <- e, where p is a pattern (see Section 3.17) of type t and e is an expression type t1. They succeed if the expression e matches the pattern p, and introduce the bindings of the pattern to the environment."
2022-12-22 17:32:43 +0000 <kjlid[m]> Oh it's a guard ofcourse, I added is as a catch-all in the case
2022-12-22 17:32:46 +0000beefbambi(~beefbambi@183.82.204.74)
2022-12-22 17:32:51 +0000 <mauke> oh, yeah
2022-12-22 17:33:29 +0000tzh(~tzh@c-24-21-73-154.hsd1.wa.comcast.net)
2022-12-22 17:33:31 +0000 <kjlid[m]> Oh yeah I had to specify what type pe was too with ScopedTypeVariables
2022-12-22 17:33:34 +0000eikke(~NicolasT@user/NicolasT) (Ping timeout: 260 seconds)
2022-12-22 17:33:38 +0000econo(uid147250@user/econo)
2022-12-22 17:34:05 +0000 <kjlid[m]> Other than that the compiler seems happy
2022-12-22 17:34:17 +0000 <mauke> I don't see why you would need ScopedTypeVariables
2022-12-22 17:34:27 +0000 <mauke> you do need some code that nails down the type of pe somehow
2022-12-22 17:34:47 +0000 <mauke> either with an explicit type signature or by passing it to a function that takes a ParseException
2022-12-22 17:36:01 +0000 <kjlid[m]> Oh ofcourse. I'm not doing anything with pe so I guess that's why
2022-12-22 17:36:52 +0000 <mauke> Left e | Just pe <- fromException e -> returnError ConversionFailed f ("Failed to parse EntryURI: " ++ show (pe :: ParseException)) -- or something like that
2022-12-22 17:37:00 +0000vpan(~0@212.117.1.172) (Quit: Leaving.)
2022-12-22 17:37:07 +0000 <mauke> I suspect 'show pe' won't be particularly human readable, though
2022-12-22 17:37:14 +0000 <mauke> or user friendly
2022-12-22 17:37:34 +0000ArtsAndLeisure(~renate@f104006.upc-f.chello.nl)
2022-12-22 17:38:54 +0000 <kjlid[m]> Well who cares about users anyway?
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2022-12-22 17:40:14 +0000 <mauke> o ho ho, the constructor is public
2022-12-22 17:40:17 +0000MajorBiscuit(~MajorBisc@31-23-159.netrun.cytanet.com.cy)
2022-12-22 17:40:40 +0000 <mauke> Left e | Just pe@ParseException{} <- fromException e -> ...
2022-12-22 17:40:47 +0000beefbambi(~beefbambi@183.82.204.74)
2022-12-22 17:40:56 +0000 <mauke> this might be considered cheeky
2022-12-22 17:41:09 +0000 <kjlid[m]> If it works it works
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2022-12-22 17:42:26 +0000 <mauke> > (\x -> case x of Nothing{} -> "it's nothing"; Just{} -> "it's something") (Just 42)
2022-12-22 17:42:27 +0000 <lambdabot> "it's something"
2022-12-22 17:43:05 +0000 <mauke> (for when you want to match against a constructor without caring what arguments it takes)
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2022-12-22 18:24:12 +0000raym(~ray@user/raym)
2022-12-22 18:26:27 +0000 <iqubic> Is it possible to sort a list of things first by one criteria, and the use a second criteria as a tie breaker?
2022-12-22 18:27:52 +0000 <iqubic> I have xs :: [a] and f,g :: (Ord b) => a -> b. I want to sort on the result of f, but use the result of g as tie breaker.
2022-12-22 18:28:07 +0000 <iqubic> Well, actually, not sort, but rather minimumBy
2022-12-22 18:29:19 +0000 <monochrom> This means (\x y -> compare (f x) (f y) <> compare (g x) (g y)) is your comparator.
2022-12-22 18:29:20 +0000 <geekosaur> use <> to combine them
2022-12-22 18:30:13 +0000 <geekosaur> or comparing f <> comparing g
2022-12-22 18:30:30 +0000 <monochrom> w00t that's simpler :)
2022-12-22 18:30:52 +0000 <geekosaur> :t comparing ?f <> comparing ?g
2022-12-22 18:30:53 +0000 <lambdabot> (Ord a1, Ord a2, ?f::b -> a1, ?g::b -> a2) => b -> b -> Ordering
2022-12-22 18:31:31 +0000 <iqubic> Thanks. I was trying "comparing (f <> g)" and was being told there was no semigroup instance for type b
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2022-12-22 18:32:17 +0000 <iqubic> thank you geekosaur.
2022-12-22 18:35:10 +0000Sciencentistguy1(~sciencent@hacksoc/ordinary-member)
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2022-12-22 18:39:55 +0000 <mauke> :t \f g -> sortOn (\x -> (f x, g x))
2022-12-22 18:39:57 +0000 <lambdabot> (Ord a, Ord b) => (t -> a) -> (t -> b) -> [t] -> [t]
2022-12-22 18:40:34 +0000motherfsck(~motherfsc@user/motherfsck)
2022-12-22 18:41:05 +0000 <mauke> :t \f g -> sortOn (\x -> ((,) $! f x) $! g x)
2022-12-22 18:41:06 +0000 <lambdabot> (Ord a, Ord b) => (t -> a) -> (t -> b) -> [t] -> [t]
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2022-12-22 19:31:21 +0000 <iqubic> I actually want minimumBy
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2022-12-22 19:37:25 +0000 <Jadesheit[m]> @pl \f -> f x y
2022-12-22 19:37:25 +0000 <lambdabot> flip ($ x) y
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2022-12-22 21:25:32 +0000 <bjourne> i have a function that emits instructions from ast nodes. would the state monad be a good fit?
2022-12-22 21:26:01 +0000 <kjlid[m]> So I have another thing I don't quite understand. https://paste.tomsmeding.com/v2r8lKcK why do I get that error there?
2022-12-22 21:27:42 +0000 <geekosaur> "emits" sounds like some variant of Writer to me
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2022-12-22 21:28:35 +0000wootehfoot(~wootehfoo@user/wootehfoot)
2022-12-22 21:31:48 +0000 <mauke> kjlid[m]: class Monad m => MonadError e m | m -> e where
2022-12-22 21:32:11 +0000 <mauke> m -> e means m uniquely determines e
2022-12-22 21:32:33 +0000 <mauke> and for m = IO, the only allowed exception type is e = IOException
2022-12-22 21:32:45 +0000 <geekosaur> earlier discussion: [18 20:47:24] <int-e> c_wraith: FWIW, I've used the W component quite a bit in a couple of assembly-like DSLs; in that design, the reader is usually unused, the state tracks labels, and the writer collects generated code. And there's an mfix somewhere to tie the labels into a know so that they can be used before the label's declaration.
2022-12-22 21:32:54 +0000 <kjlid[m]> oh, okay
2022-12-22 21:32:57 +0000 <mauke> your are in IO, but trying to throw HpassError
2022-12-22 21:33:41 +0000 <kjlid[m]> So I should just return Left?
2022-12-22 21:34:06 +0000 <mauke> not sure, I'm not that familiar with MonadError
2022-12-22 21:34:25 +0000 <kjlid[m]> Alright
2022-12-22 21:34:28 +0000 <mauke> but yeah, returning it to the outer layer (where you can throw it like you want) makes sense
2022-12-22 21:35:00 +0000 <mauke> actually ...
2022-12-22 21:35:21 +0000 <mauke> why is this thing polymorphic at all?
2022-12-22 21:35:38 +0000 <mauke> :t throwIO
2022-12-22 21:35:40 +0000 <lambdabot> Exception e => e -> IO a
2022-12-22 21:36:19 +0000 <kjlid[m]> Honestly? No reason really. I'm just learning stuff
2022-12-22 21:36:39 +0000 <mauke> wait, I might be dumb
2022-12-22 21:37:06 +0000 <mauke> yeah, it's actually two separate things :-)
2022-12-22 21:37:11 +0000 <geekosaur> I wasn't sure that was in IO, since it's got that withConnection thing
2022-12-22 21:37:35 +0000 <kjlid[m]> withConnection :: forall a. String -> (Connection -> IO a) -> IO a
2022-12-22 21:37:53 +0000 <mauke> kjlid[m]: step 1: use throwIO instead of throwError
2022-12-22 21:37:55 +0000 <geekosaur> okay, so yes IO
2022-12-22 21:38:07 +0000 <mauke> you are in IO, you can throw whatever you want (as long as it's an instance of Exception)
2022-12-22 21:38:28 +0000 <mauke> step 2: I would just drop the 'liftIO' wrapper
2022-12-22 21:38:55 +0000 <kjlid[m]> mauke: But I wanted to catch the exceptions, handle them and *return* a proper value instead. Don't need no stinking exceptions where we're going
2022-12-22 21:38:55 +0000 <mauke> anyone who needs createDb in some other monad can just 'liftIO (createDb ...)'
2022-12-22 21:39:56 +0000 <mauke> kjlid[m]: huh?
2022-12-22 21:40:04 +0000 <mauke> then why do you have throwError in there?
2022-12-22 21:41:39 +0000 <kjlid[m]> https://hackage.haskell.org/package/mtl-2.2.2/docs/src/Control.Monad.Error.Class.html#line-134 <- I looked there and assumed it would be the same as `Left`
2022-12-22 21:42:25 +0000 <kjlid[m]> Actually I'm an idiot
2022-12-22 21:42:32 +0000 <kjlid[m]> It is but I accidentally used Control.Monad.Except
2022-12-22 21:43:27 +0000 <mauke> that instance doesn't really apply here. we're in IO, not Either
2022-12-22 21:44:08 +0000 <kjlid[m]> Actually I'm an idiot again.
2022-12-22 21:44:21 +0000 <kjlid[m]> Alright
2022-12-22 21:44:23 +0000eikke(~NicolasT@user/NicolasT) (Ping timeout: 260 seconds)
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2022-12-22 21:45:39 +0000 <kjlid[m]> But if I remove that liftIO then I get Couldn't match type ‘m’ with ‘IO’
2022-12-22 21:46:12 +0000 <mauke> old type signature?
2022-12-22 21:46:53 +0000 <kjlid[m]> What do you mean?
2022-12-22 21:46:55 +0000 <mauke> createDb :: FilePath -> [Pubkey] -> IO [Pubkey]
2022-12-22 21:47:34 +0000 <kjlid[m]> I want IO (Either HpassError [Pubkey])
2022-12-22 21:48:29 +0000 <mauke> oh, there's probably a smart way to do that
2022-12-22 21:48:40 +0000 <mauke> :t try
2022-12-22 21:48:41 +0000 <lambdabot> Exception e => IO a -> IO (Either e a)
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2022-12-22 21:54:43 +0000 <kjlid[m]> mauke: https://paste.tomsmeding.com/5ZA990UI <- This is essentially what I want to do
2022-12-22 21:55:09 +0000 <mauke> kjlid[m]: that return type doesn't make much sense
2022-12-22 21:55:18 +0000fizbin(~fizbin@user/fizbin)
2022-12-22 21:55:31 +0000 <kjlid[m]> It doesn't?
2022-12-22 21:55:31 +0000 <mauke> the only value this thing can return successfully is 'keys' as passed in by the caller
2022-12-22 21:56:21 +0000AlexNoo__AlexNoo
2022-12-22 21:56:40 +0000 <mauke> it doesn't give you any information over IO (Maybe HpassError)
2022-12-22 21:56:43 +0000 <kjlid[m]> Because forM?
2022-12-22 21:56:51 +0000jakalx(~jakalx@base.jakalx.net)
2022-12-22 21:57:07 +0000 <mauke> yeah
2022-12-22 21:57:38 +0000 <mauke> you're mapping over 'keys', which gives you the current element 'k'
2022-12-22 21:57:56 +0000 <mauke> on success, you return 'k', which forM then assembles into a list equal to 'keys'
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2022-12-22 22:00:03 +0000 <kjlid[m]> Oh yeah I know that. The idea with the return type is that I'm going to return a list with "actually added" keys
2022-12-22 22:00:27 +0000 <kjlid[m]> E.g. remove duplicates first
2022-12-22 22:00:31 +0000 <kjlid[m]> I'm just not doing that yet
2022-12-22 22:03:05 +0000 <kjlid[m]> But yeah, maybe it makes more sense to move that elsewhere
2022-12-22 22:05:52 +0000 <mauke> is the HpassError type an instance of Exception?
2022-12-22 22:06:33 +0000 <kjlid[m]> No it isn't
2022-12-22 22:07:21 +0000 <mauke> aw
2022-12-22 22:07:25 +0000motherfsck(~motherfsc@user/motherfsck)
2022-12-22 22:07:38 +0000 <kjlid[m]> Would it simplify stuff?
2022-12-22 22:07:57 +0000 <kjlid[m]> I tend to avoid exceptions
2022-12-22 22:10:04 +0000fizbin(~fizbin@user/fizbin) (Ping timeout: 260 seconds)
2022-12-22 22:10:36 +0000 <kjlid[m]> Okay I switched to Maybe instead of Either. Is there a function that does what I want? I have looked all over the place but couldn't find anything
2022-12-22 22:11:48 +0000coot(~coot@2a02:a310:e241:1b00:ec1a:e9df:79ac:66ba)
2022-12-22 22:13:10 +0000 <mauke> kjlid[m]: if it were, I think you could do something like: https://paste.tomsmeding.com/64RXnOt9
2022-12-22 22:16:11 +0000 <kjlid[m]> Hmm, alright
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2022-12-22 22:32:36 +0000 <bjourne> when haskell says "Non-exhaustive patterns in function" can you get it to state the type name?
2022-12-22 22:32:57 +0000fizbin(~fizbin@user/fizbin)
2022-12-22 22:33:07 +0000 <mauke> s/haskell/ghc/
2022-12-22 22:33:33 +0000 <geekosaur> how do you know it's only one type/pattern?
2022-12-22 22:33:36 +0000 <kjlid[m]> Is there a try that returns a Maybe instead?
2022-12-22 22:34:30 +0000 <mauke> :t eitherToMaybe
2022-12-22 22:34:31 +0000 <lambdabot> error: Variable not in scope: eitherToMaybe
2022-12-22 22:34:35 +0000 <mauke> :-(
2022-12-22 22:35:30 +0000 <geekosaur> `either (const Nothing) Just . try`
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2022-12-22 23:02:24 +0000 <kjlid[m]> https://paste.tomsmeding.com/EvuLLcEC shouldn't these two functions be the same thing?
2022-12-22 23:02:49 +0000califax(~califax@user/califx)
2022-12-22 23:03:47 +0000 <kjlid[m]> createDb compiles, createDb2 doesn't
2022-12-22 23:04:12 +0000motherfsck(~motherfsc@user/motherfsck) (Ping timeout: 265 seconds)
2022-12-22 23:04:39 +0000motherfsck(~motherfsc@user/motherfsck)
2022-12-22 23:04:40 +0000 <geekosaur> I'd be wary of ($)
2022-12-22 23:05:38 +0000 <geekosaur> it's not goingf to read your mind, it's not going to hunt for a place which makes it have the right type, it's a right-associative operator with lowest precedence and in this case is probably not doing what you intend
2022-12-22 23:06:30 +0000 <dsal> There's a joke about mind on $ but not $ on mind
2022-12-22 23:08:16 +0000nek0(~nek0@2a01:4f8:222:2b41::12)
2022-12-22 23:11:55 +0000 <kjlid[m]> But even if I do `let foo = sequence =<< forM keys ...` I get an error
2022-12-22 23:13:48 +0000wootehfoot(~wootehfoo@user/wootehfoot) (Read error: Connection reset by peer)
2022-12-22 23:18:53 +0000 <Square> there are no nifty methods to update lists other than take/drop combos?
2022-12-22 23:19:14 +0000 <dsal> what?
2022-12-22 23:19:24 +0000 <EvanR> yeah, not really
2022-12-22 23:19:36 +0000 <dsal> I'm not entirely sure what you mean by "update" but there are countless ways to do things.
2022-12-22 23:19:43 +0000 <EvanR> you can write a recursive function to zip to where you want to do an update and do something
2022-12-22 23:19:55 +0000 <Square> i meant like : update :: Int -> a -> [a] -> [a], however unsafe that looks
2022-12-22 23:19:59 +0000 <EvanR> and package that as a lens, or just use lens
2022-12-22 23:20:18 +0000 <Square> ok, thanks
2022-12-22 23:20:40 +0000 <EvanR> e.g. update :: Int -> (a -> a) -> [a] -> [a]
2022-12-22 23:21:03 +0000 <EvanR> or throw a maybe in there
2022-12-22 23:21:18 +0000 <c_wraith> > [11..17] & ix 3 %~ negate
2022-12-22 23:21:19 +0000 <lambdabot> [11,12,13,-14,15,16,17]
2022-12-22 23:21:31 +0000 <Square> its just for AOC so i'm not looking for something beutiful =D
2022-12-22 23:21:51 +0000 <dsal> If you're looking to update a single thing in the middle of a list, you probably don't want a list.
2022-12-22 23:21:55 +0000fizbin(~fizbin@user/fizbin) (Ping timeout: 256 seconds)
2022-12-22 23:22:51 +0000 <Square> good idea, ill zip it and make a Map of it and then back
2022-12-22 23:22:55 +0000 <dsal> Data.Sequence or Data.Map or Data.Array
2022-12-22 23:23:27 +0000takuan(~takuan@178-116-218-225.access.telenet.be) (Remote host closed the connection)
2022-12-22 23:24:10 +0000 <Square> sequence looks promising too. Ill ttry that
2022-12-22 23:25:11 +0000MajorBiscuit(~MajorBisc@31-23-159.netrun.cytanet.com.cy) (Ping timeout: 260 seconds)
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2022-12-22 23:25:36 +0000 <geekosaur> kjlid[m], you used <-, changing it to a let or a $ won't work, it needs a >>=
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2022-12-22 23:26:06 +0000 <geekosaur> `x <- expr` is `expr >>= \x ->`
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2022-12-22 23:33:13 +0000 <kjlid[m]> So I redid createDb2 a little: https://paste.tomsmeding.com/BgcrsKPT
2022-12-22 23:33:47 +0000 <dsal> I'd advise against `return` in general as it makes people think they need it. heh.
2022-12-22 23:34:04 +0000 <kjlid[m]> Why does sequence turn into `[Either HpassError Pubkey] -> IO [Pubkey]`?
2022-12-22 23:34:04 +0000 <dsal> `foo <- forM keys (insertKey conn) >>= sequence; return foo` is the same thing as `forM keys (insertKey conn) >>= sequence`
2022-12-22 23:35:55 +0000 <dsal> :t sequence
2022-12-22 23:35:56 +0000 <lambdabot> (Traversable t, Monad m) => t (m a) -> m (t a)
2022-12-22 23:36:18 +0000 <EvanR> dsal, Square, ime if you start with a list, convert to a Map, do something, and convert back many times then no, it's better to use a list updater
2022-12-22 23:36:34 +0000 <EvanR> especially if the number of things in the list is medium to small
2022-12-22 23:36:55 +0000 <EvanR> or you probabilistically operate near the beginning usually
2022-12-22 23:37:16 +0000 <dsal> kjlid[m]: It looks like you mean `sequence <$> traverse (insertKey conn) keys`
2022-12-22 23:37:18 +0000 <EvanR> if you can stay as a Map all the time that's another story
2022-12-22 23:37:54 +0000freeside(~mengwong@103.252.202.159)
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2022-12-22 23:39:44 +0000 <Square> sure, but this isn't important work. =D
2022-12-22 23:42:08 +0000 <dsal> Well, yeah, you don't want to convert in and out, but you should be able to do all the work in Sequence.
2022-12-22 23:42:26 +0000motherfsck(~motherfsc@user/motherfsck) (Ping timeout: 272 seconds)
2022-12-22 23:44:20 +0000 <kjlid[m]> dsal: I think that's literally the only combination I didn't try for some reason
2022-12-22 23:50:59 +0000talismanick(~talismani@76.133.152.122)
2022-12-22 23:51:29 +0000 <EvanR> Seq has better asymptotics but there is some overhead making a list better (and arguably simpler) when N is expected to be low
2022-12-22 23:51:41 +0000 <EvanR> below whatever breakeven
2022-12-22 23:57:28 +0000 <EvanR> though Seq comes with an actual API which is nice
2022-12-22 23:57:48 +0000zeenk(~zeenk@82.79.126.109) (Quit: Konversation terminated!)
2022-12-22 23:59:17 +0000cheater(~Username@user/cheater)
2022-12-22 23:59:21 +0000 <dsal> Note that a lot of the API is in Data.Foldable