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2024-07-16 02:02:15 +0000 <dmj`> there should be a THIH that uses the constraint solving approach
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2024-07-16 10:21:27 +0000 <tromp> what is the type of Church numeral 2 in CoC (Calculus of Constructions) ? Is it Nat = forall(a : *) -> (a -> a) -> a -> a ?
2024-07-16 10:23:08 +0000Square2(~Square@user/square) (Ping timeout: 258 seconds)
2024-07-16 10:25:14 +0000 <ncf> all church numerals have the same type
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2024-07-16 10:39:00 +0000tromp(~textual@92-110-219-57.cable.dynamic.v4.ziggo.nl)
2024-07-16 10:39:46 +0000 <tromp> got disconnected; hope I didn't miss an answer...
2024-07-16 10:40:53 +0000 <ncf> all church numerals have the same type
2024-07-16 10:51:56 +0000 <tromp> i know
2024-07-16 10:52:17 +0000 <tromp> is that the correct type?
2024-07-16 10:52:53 +0000 <ncf> sure
2024-07-16 10:53:25 +0000 <tromp> is that short for forall(a : *) -> forall(_ : (forall(_ : a -> a)) -> forall(_ : a) -> a ?
2024-07-16 10:54:31 +0000 <tromp> i.e. 4 uses of the Pi constructor?
2024-07-16 10:55:49 +0000 <ncf> yes
2024-07-16 10:56:40 +0000 <ncf> (a : *) → (_ : (_ : a) → a) → (_ : a) → a
2024-07-16 10:59:14 +0000 <tromp> Thanks. Does anyone know of a Haskell implementation of Loader's Number? https://googology.fandom.com/wiki/Loader%27s_number
2024-07-16 11:03:16 +0000 <ncf> that would be cool, but i don't
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2024-07-16 13:07:06 +0000 <haskellbridge> <mauke> Why are messages from ncf shown as coming from "haskellbridge" on the Matrix side?
2024-07-16 13:13:55 +0000m5zs7k(aquares@web10.mydevil.net)
2024-07-16 13:16:46 +0000AlexNoo(~AlexNoo@178.34.160.117)
2024-07-16 13:17:10 +0000AlexZenon(~alzenon@178.34.160.117)
2024-07-16 13:17:54 +0000 <ncf> um, because i'm on irc?
2024-07-16 13:19:06 +0000 <ncf> test
2024-07-16 13:20:20 +0000 <ncf> yeah i guess that's weird. geekosaur?
2024-07-16 13:23:26 +0000kuribas(~user@ip-188-118-57-242.reverse.destiny.be)
2024-07-16 13:31:15 +0000 <EvanR> test
2024-07-16 13:50:47 +0000hugo-(hugo@quicksilver.lysator.liu.se) (Quit: ZNC 1.8.2+deb3.1 - https://znc.in)
2024-07-16 14:06:58 +0000ystael(~ystael@user/ystael)
2024-07-16 14:14:42 +0000kaol(~kaol@94-237-42-30.nl-ams1.upcloud.host) (Server closed connection)
2024-07-16 14:14:49 +0000kaol(~kaol@94-237-42-30.nl-ams1.upcloud.host)
2024-07-16 14:15:46 +0000chiselfuse(~chiselfus@user/chiselfuse) (Ping timeout: 260 seconds)
2024-07-16 14:16:51 +0000chiselfuse(~chiselfus@user/chiselfuse)
2024-07-16 14:29:06 +0000 <geekosaur> "view raw" says your client is sending notices instead of messages
2024-07-16 14:29:23 +0000 <geekosaur> …wait, but it just did that to mine too
2024-07-16 14:30:05 +0000haskellbridge(~hackager@syn-024-093-192-219.res.spectrum.com) (Remote host closed the connection)
2024-07-16 14:30:25 +0000 <geekosaur> uh oh
2024-07-16 14:30:27 +0000haskellbridge(~hackager@syn-024-093-192-219.res.spectrum.com)
2024-07-16 14:30:27 +0000ChanServ+v haskellbridge
2024-07-16 14:31:04 +0000 <tomsmeding> test
2024-07-16 14:31:11 +0000kritzefitz(~kritzefit@debian/kritzefitz) (Ping timeout: 264 seconds)
2024-07-16 14:31:21 +0000 <geekosaur> foo
2024-07-16 14:31:45 +0000 <geekosaur> working now
2024-07-16 14:31:57 +0000 <ncf> 🐝
2024-07-16 14:32:15 +0000 <mauke> what happen?
2024-07-16 14:32:23 +0000chiselfuse(~chiselfus@user/chiselfuse) (Remote host closed the connection)
2024-07-16 14:32:24 +0000gmg(~user@user/gehmehgeh) (Remote host closed the connection)
2024-07-16 14:32:24 +0000 <geekosaur> dunno
2024-07-16 14:32:25 +0000ChaiTRex(~ChaiTRex@user/chaitrex) (Remote host closed the connection)
2024-07-16 14:32:25 +0000chexum(~quassel@gateway/tor-sasl/chexum) (Remote host closed the connection)
2024-07-16 14:32:33 +0000 <ncf> yay
2024-07-16 14:32:39 +0000chexum(~quassel@gateway/tor-sasl/chexum)
2024-07-16 14:32:57 +0000ChaiTRex(~ChaiTRex@user/chaitrex)
2024-07-16 14:33:10 +0000chiselfuse(~chiselfus@user/chiselfuse)
2024-07-16 14:33:10 +0000 <geekosaur> I did restart it a couple days ago, maybe they had a bad update (I'm running from their `latest` docker container)
2024-07-16 14:33:20 +0000gmg(~user@user/gehmehgeh)
2024-07-16 14:40:05 +0000deriamis_(deriamis@ec2-54-187-167-69.us-west-2.compute.amazonaws.com) (Server closed connection)
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2024-07-16 14:48:53 +0000 <haskellbridge> <thirdofmay18081814goya> anyone got suggestions for declaring nested records to parse a nested json object? any extension that would allow me to declare a single nested record data type instead of needing to make a new data type for each subsequent nested record?
2024-07-16 14:49:18 +0000 <haskellbridge> <thirdofmay18081814goya> e.g. i'd like to make a data type that models
2024-07-16 14:49:18 +0000 <haskellbridge> ... long message truncated: https://kf8nh.com/_matrix/media/v3/download/kf8nh.com/fJODeknIoqILfAADEYDhRSUD (27 lines)
2024-07-16 14:50:55 +0000kritzefitz(~kritzefit@debian/kritzefitz)
2024-07-16 14:52:11 +0000 <mauke> with aeson, wouldn't that just be custom FromJSON/ToJSON instances?
2024-07-16 14:52:33 +0000 <haskellbridge> <thirdofmay18081814goya> mauke: yeah but i'd like to declare it in a single data type
2024-07-16 14:52:40 +0000 <mauke> except you don't get "nested records" on the haskell side
2024-07-16 14:52:50 +0000 <mauke> you can do it with a flat record, though
2024-07-16 14:53:23 +0000zetef(~quassel@82.76.106.80)
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2024-07-16 14:54:21 +0000ash3en(~ash3en@89.246.174.164)
2024-07-16 14:54:29 +0000 <haskellbridge> <thirdofmay18081814goya> mauke: yeah purely as a question of presentation i wanted to avoid multiple flat records
2024-07-16 14:54:47 +0000 <tomsmeding> what would the desired set of data types be?
2024-07-16 14:54:56 +0000 <tomsmeding> if you don't want nested records
2024-07-16 14:54:59 +0000 <mauke> ... multiple?
2024-07-16 14:55:14 +0000 <tomsmeding> or is it "I want the normal thing but I want to type less code"
2024-07-16 14:55:50 +0000 <haskellbridge> <thirdofmay18081814goya> mauke: yeah, one record for the "response" data type, and another for each nested record within "response": "identity", "stock", "dimensions", etc.
2024-07-16 14:56:53 +0000 <tomsmeding> there is no extension that will create that set of data types for you from some smaller description of the structure
2024-07-16 14:57:05 +0000 <tomsmeding> you could write some TemplateHaskell and make it though :p
2024-07-16 14:57:16 +0000 <cheater> i was just going to say that TH is one such extension
2024-07-16 14:57:46 +0000 <haskellbridge> <thirdofmay18081814goya> yeah might be a template haskell question, i have multiple of these i'd like to define. really i just want to have a nice self-contained type declaration i can look at, it's not for any other reason
2024-07-16 14:57:52 +0000 <haskellbridge> <thirdofmay18081814goya> will look up how i might do this with TH, ty
2024-07-16 14:58:18 +0000 <mauke> https://hackage.haskell.org/package/aeson-2.2.3.0/docs/Data-Aeson.html#g:2
2024-07-16 14:58:28 +0000 <cheater> can it be you're just not used to what haskell looks like
2024-07-16 14:58:43 +0000 <cheater> sometimes the best hack is no hack at all
2024-07-16 14:58:56 +0000 <cheater> keep doing things the way god intended
2024-07-16 14:59:54 +0000ddellacosta(~ddellacos@ool-44c73d29.dyn.optonline.net)
2024-07-16 15:00:12 +0000 <haskellbridge> <thirdofmay18081814goya> heheh it's possible, but i enjoy typescript's self-contained presentation of this sort of type
2024-07-16 15:00:15 +0000 <ash3en> what is the TH situation? is this not needed magic hackery causing headaches or superior meta programming for pros?
2024-07-16 15:00:48 +0000ezzieyguywuf(~Unknown@user/ezzieyguywuf)
2024-07-16 15:01:05 +0000 <ash3en> or rephrased: is TH elegant?
2024-07-16 15:02:19 +0000 <tomsmeding> that is in the eye of the beholder :)
2024-07-16 15:02:56 +0000 <mauke> yesn't
2024-07-16 15:04:18 +0000ddellacosta(~ddellacos@ool-44c73d29.dyn.optonline.net) (Ping timeout: 248 seconds)
2024-07-16 15:07:07 +0000 <ash3en> intuively it *feels* like a liability and breaking haskell concepts. but otoh it may use haskell to it's fullest! arghh help lol
2024-07-16 15:13:00 +0000misterfish(~misterfis@87.215.131.102) (Ping timeout: 252 seconds)
2024-07-16 15:13:54 +0000 <haskellbridge> <thirdofmay18081814goya> there's an anonymous records library that's being maintained
2024-07-16 15:13:55 +0000 <haskellbridge> <thirdofmay18081814goya> "large-anon"
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2024-07-16 15:22:52 +0000 <haskellbridge> <thirdofmay18081814goya> found someone who already did the work: https://github.com/brandonchinn178/aeson-schemas
2024-07-16 15:23:01 +0000 <haskellbridge> <thirdofmay18081814goya> bless 'em
2024-07-16 15:30:41 +0000 <EvanR> last resort TH is also bad because of compile times
2024-07-16 15:30:57 +0000 <tomsmeding> what is "last resort TH"?
2024-07-16 15:31:40 +0000 <EvanR> just TH
2024-07-16 15:32:09 +0000 <EvanR> metaprogramming = missing language feature
2024-07-16 15:32:36 +0000 <tomsmeding> or experimental language feature
2024-07-16 15:32:55 +0000 <tomsmeding> or language feature that would be nice but would unnecessarily burden the maintainers of the language implementation for something that only you use
2024-07-16 15:33:07 +0000 <tomsmeding> metaprogramming _is_ a language feature
2024-07-16 15:33:31 +0000 <tomsmeding> to the extent that various languages do metaprogramming in vastly different ways
2024-07-16 15:34:19 +0000 <tomsmeding> Rust even has two: macro_rules! and procedural macros
2024-07-16 15:35:24 +0000 <EvanR> it covers all missing language features
2024-07-16 15:35:45 +0000 <EvanR> but not necessarily in the best and most efficient way
2024-07-16 15:35:45 +0000 <tomsmeding> no, there are language features that you cannot cover with most existing metaprogramming designs
2024-07-16 15:35:57 +0000 <EvanR> like what
2024-07-16 15:36:08 +0000 <tomsmeding> IO from a language that doesn't have IO?
2024-07-16 15:36:21 +0000 <EvanR> how does this apply to TH
2024-07-16 15:36:28 +0000 <tomsmeding> you were talking about metaprogramming in general :p
2024-07-16 15:36:45 +0000 <EvanR> yeah there is crippled metaprogramming
2024-07-16 15:36:51 +0000 <EvanR> like C preprocessor
2024-07-16 15:37:05 +0000 <tomsmeding> no matter how good your metaprogramming, if the base language does not have IO, you're not going to metaprogram yourself to IO
2024-07-16 15:37:19 +0000 <EvanR> by IO are you just talking about a type system
2024-07-16 15:37:35 +0000 <EvanR> clearly most languages have I/O
2024-07-16 15:37:38 +0000 <tomsmeding> no I mean stuff like lua where if the host does not give you IO libraries, you _cannot do IO_
2024-07-16 15:38:02 +0000 <tomsmeding> which is the point of lua as an embedded language, the host can restrict what kind of side effects are possible
2024-07-16 15:38:18 +0000 <tomsmeding> by simply not giving you the functions which would perform those side effects
2024-07-16 15:38:21 +0000 <EvanR> lua has I/O unless you go out of your way to cripple it and move it to the host
2024-07-16 15:38:32 +0000 <EvanR> but I don't know if this matters to the argument
2024-07-16 15:38:46 +0000 <tomsmeding> I took issue with your blanket statements that metaprogramming fixes all problems :p
2024-07-16 15:38:53 +0000 <EvanR> it doesn't really have metaprogramming
2024-07-16 15:39:18 +0000 <tomsmeding> and even assuming that you're in a turing-complete language with side effects etc, you could perhaps theoretically map any kind of code to whatever you want it to mean
2024-07-16 15:39:30 +0000 <tomsmeding> but it's not like that's practical or a decent way to implement a missing language feature :p
2024-07-16 15:39:39 +0000 <EvanR> that's what I was saying
2024-07-16 15:39:52 +0000 <tomsmeding> then why do you say "it covers all missing language features"
2024-07-16 15:39:57 +0000 <tomsmeding> technically correct, maybe
2024-07-16 15:40:27 +0000 <tomsmeding> still, I could want interactive hole filling in haskell
2024-07-16 15:40:28 +0000 <EvanR> stop argeeing!
2024-07-16 15:40:32 +0000 <tomsmeding> is that a language feature or a compiler feature?
2024-07-16 15:40:39 +0000 <tomsmeding> lol
2024-07-16 15:40:59 +0000 <tomsmeding> as in, "technically correct if you choose unhelpful definitions of the words in question"
2024-07-16 15:41:13 +0000 <tomsmeding> anyway this discussion got longer than it was meant to lol
2024-07-16 15:41:36 +0000 <tomsmeding> sorry for the rant
2024-07-16 15:42:07 +0000L29Ah(~L29Ah@wikipedia/L29Ah) ()
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2024-07-16 15:42:21 +0000danse-nr3(~danse-nr3@user/danse-nr3)
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2024-07-16 15:52:51 +0000 <haskellbridge> <thirdofmay18081814goya> what's your preferred approach to refinement types in haskell?
2024-07-16 15:52:54 +0000 <haskellbridge> <thirdofmay18081814goya> liquid haskell?
2024-07-16 15:54:18 +0000 <EvanR> smart constructors
2024-07-16 15:55:00 +0000 <EvanR> liquid haskell is another language
2024-07-16 16:05:24 +0000 <haskellbridge> <thirdofmay18081814goya> EvanR: hm, you can't call these in type declarations
2024-07-16 16:05:50 +0000 <haskellbridge> <thirdofmay18081814goya> +(if you want to use refinement types to declare other types)
2024-07-16 16:05:59 +0000 <EvanR> in liquid haskell?
2024-07-16 16:06:10 +0000mikess(~mikess@user/mikess)
2024-07-16 16:06:24 +0000 <haskellbridge> <thirdofmay18081814goya> no in standard haskell
2024-07-16 16:08:37 +0000 <EvanR> haskell doesn't have refinement types
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2024-07-16 17:22:54 +0000 <amjoseph> tromp thanks for posting that! would never have expected that the [sequence whose limit is the] proof-theoretic ordinal for CoC can be computed by such a short program. i'm a bit surprised, however, that they didn't *prove* that it actually computes that. you should be able to prove it in coq since iirc CiC has strictly greater consistency strength. anyways, TIL; thanks.
2024-07-16 17:23:05 +0000ash3en(~ash3en@2a02:3100:7db2:6b01:4f69:739c:8091:4c20)
2024-07-16 17:23:58 +0000tromp(~textual@92-110-219-57.cable.dynamic.v4.ziggo.nl) (Quit: My iMac has gone to sleep. ZZZzzz…)
2024-07-16 17:25:36 +0000 <amjoseph> tromp (also) maybe try asking sridhar ramesh?
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2024-07-16 17:51:49 +0000misterfish(~misterfis@84.53.85.146)
2024-07-16 17:55:51 +0000 <mauke> :t \x y -> ?f x y <= EQ
2024-07-16 17:55:52 +0000 <lambdabot> (?f::t1 -> t2 -> Ordering) => t1 -> t2 -> Bool
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2024-07-16 18:54:53 +0000 <stefan-__> is it possible to check if a FilePath exists (and if not show an error) when extracting CLI params via optparse-applicative?
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2024-07-16 18:59:06 +0000 <mud> stefan-__: Not saying you definitely shouldn't do that, but: be careful of the pattern of check-first for files. It leads to race conditions, things can change between when you check and when you actually use it.
2024-07-16 18:59:23 +0000 <mud> You're usually better off just dealing with the error _as_ you use the file, because you're going to have to do it there anyway.
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2024-07-16 19:21:58 +0000 <EvanR> boldly open the file and if there is a reasonable thing to do other than crash in case of a problem, catch the specific exception
2024-07-16 19:24:01 +0000 <EvanR> or in a more complicated application, check the result of the async thread tasked with doing something with that file
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2024-07-16 20:29:17 +0000 <stefan-__> mud + EvanR: thanks, maybe this even better fits separation of concerns, in the way that optparse-applicative is really only used for CLI param parsing
2024-07-16 20:30:23 +0000 <raehik> I want to sort a list-like `f a`. I have an `a -> a -> Ordering`. Is there a way I can do this polymorphically over `f`?
2024-07-16 20:31:07 +0000 <ncf> raehik: https://elvishjerricco.github.io/2017/03/23/applicative-sorting.html ?
2024-07-16 20:31:37 +0000 <mreh> what about using Foldable?
2024-07-16 20:32:30 +0000 <raehik> mreh: Foldable is for folding operations. I don't want to fold the list to a single value
2024-07-16 20:32:36 +0000tomku(~tomku@user/tomku) (Ping timeout: 272 seconds)
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2024-07-16 20:32:44 +0000 <raehik> I can't see an `f a -> f a` operation in Foldable
2024-07-16 20:32:47 +0000 <mreh> :t toList
2024-07-16 20:32:48 +0000 <lambdabot> Foldable t => t a -> [a]
2024-07-16 20:32:51 +0000tomku(~tomku@user/tomku)
2024-07-16 20:33:10 +0000 <mreh> half way there
2024-07-16 20:33:29 +0000 <ncf> you obviously need Traversable
2024-07-16 20:33:45 +0000 <ncf> or something equivalent
2024-07-16 20:34:14 +0000 <raehik> mreh: this lets me sort `f a`, but at the cost of going between List, which isn't really what I was looking for
2024-07-16 20:34:27 +0000 <mreh> raehik: listen to ncf
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2024-07-16 20:34:49 +0000 <raehik> ncf: thanks for that, looks interesting!
2024-07-16 20:34:52 +0000 <mreh> You want to substitute elements in the functor for each other, traversable sounds like a good fit to me
2024-07-16 20:37:33 +0000machinedgod(~machinedg@d173-183-246-216.abhsia.telus.net)
2024-07-16 20:38:00 +0000 <raehik> my thought process was "what if I had a `Vector a` and wanted to sort it quickly", but... I can't see a sort op in the vector package. huh
2024-07-16 20:39:34 +0000mrehwonders how does one update a collection using multiple concurrent `Event (f a -> f a)`s in reflex...
2024-07-16 20:39:46 +0000 <mreh> raehik: what flavour of Vector?
2024-07-16 20:40:05 +0000 <mreh> and what does quickly mean?
2024-07-16 20:40:16 +0000 <raehik> Any, say Primitive
2024-07-16 20:40:40 +0000CiaoSen(~Jura@2a05:5800:2b3:5600:e6b9:7aff:fe80:3d03)
2024-07-16 20:40:53 +0000 <raehik> quickly as in init a new vector of the same size and write into it
2024-07-16 20:41:39 +0000 <mreh> I would just convert between Vector a and [a] and back again probably
2024-07-16 20:41:53 +0000 <raehik> perhaps stream fusion permits simply going through List
2024-07-16 20:42:10 +0000 <haskellbridge> <Jade> `vector-algorithms` has fast sorts
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2024-07-16 20:42:56 +0000 <raehik> Ah! yes, fantastic. I knew of that pkg too haha
2024-07-16 20:43:03 +0000 <raehik> it does in-place sorts so hard to Hoogle
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2024-07-16 20:55:28 +0000 <raehik> I've used mutable vectors before and I still had to search around to confirm how to do basic things (`modify`)...
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2024-07-16 21:03:06 +0000 <raehik> it'd also be nice if vector-algorithms endorsed certain sorts for different usages. I had to go through each module to check docs instead. perhaps that's the intended experience but felt a bit long-winded
2024-07-16 21:04:29 +0000emmanuelux(~emmanuelu@user/emmanuelux)
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2024-07-16 21:09:46 +0000 <EvanR> haskell is fairly far down the road from "just sort my list-like thing I don't care how you do it"
2024-07-16 21:10:00 +0000 <EvanR> starting with how there's no generic "list-like" data structure
2024-07-16 21:10:01 +0000ash3en(~ash3en@2a02:3100:7db2:6b01:4f69:739c:8091:4c20)
2024-07-16 21:10:30 +0000 <EvanR> you have to decide what string, what number, what whatever based on whether you're optimizing engineering effort or performance for the task
2024-07-16 21:10:32 +0000AlexZenon(~alzenon@178.34.160.117)
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2024-07-16 21:13:43 +0000 <raehik> EvanR: Right, I agree. vector-algos gives many options for sorting
2024-07-16 21:14:20 +0000 <raehik> I was lamenting the lack of any package preamble or introduction. I don't want a button that says "just use this", I was hoping for a general overview
2024-07-16 21:15:21 +0000 <raehik> (perhaps you were looking at earlier messages, I was specifically keen on Vectors now)
2024-07-16 21:17:20 +0000 <monochrom> There is the issue of having heard of vector-algorithms in the first place. But suppose we're past that, then maybe you haven't seen the life hack of: click on any module, then click on "Index".
2024-07-16 21:18:03 +0000 <monochrom> BTW I also wish the "Index" link were on the package front page on hackage.
2024-07-16 21:20:04 +0000 <tomsmeding> monochrom: it is
2024-07-16 21:20:09 +0000 <tomsmeding> [Index] under Modules
2024-07-16 21:20:49 +0000 <monochrom> Ugh OK now I see but it's ant-size that's why I never saw it.
2024-07-16 21:21:21 +0000AlexZenon(~alzenon@178.34.160.117) (Ping timeout: 248 seconds)
2024-07-16 21:21:22 +0000 <tomsmeding> I myself am quite partial to Quick Jump, which is also brought up if you press the 's' key on the keyboard on any module page (and, for many packages -- but apparently not this one -- on the package front page)
2024-07-16 21:21:53 +0000 <tomsmeding> I found the link by searching for "index" on the page :p
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2024-07-16 21:26:43 +0000 <raehik> monochrom: if that's the intended experience then all good I suppose. individual modules have great docs but the user is apparently expected to click around until they're happy with the algo they find
2024-07-16 21:27:23 +0000 <raehik> I was hoping for some benches and high-level notes. not actively complaining or searching for a fix
2024-07-16 21:27:32 +0000 <monochrom> I don't think it's intended. But I think people trust too much into hierarchies.
2024-07-16 21:28:00 +0000 <raehik> monochrom: as in module hierarchies? unclear what you mean
2024-07-16 21:30:09 +0000 <monochrom> OK let me describe my own dilemma. I teach multiple courses, over multiple semesters. Should my directory tree structure be "semester/course" or should it be "course/semester"? (Answer: "tree" is already wrong right there. Should be a matrix.)
2024-07-16 21:31:41 +0000 <monochrom> I even sometimes torment my C-and-Unix students with: "The prof was using the former but now changes his mind and wants to migrate to the latter! Write a shell script for that..."
2024-07-16 21:31:43 +0000 <raehik> you're absolutely right I hate hierarchies too. we need a filesystem based on tag matrices NOW
2024-07-16 21:33:31 +0000 <raehik> the current answer is, sadly, an overabundance of symlinks
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