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2022-10-09 03:45:34 +0200 | rosalind | lovebug |
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2022-10-09 04:02:29 +0200 | johnjaye | (~pi@173.209.64.74) |
2022-10-09 04:02:59 +0200 | <johnjaye> | does haskell let functions take a variable number of arguments? |
2022-10-09 04:03:21 +0200 | wroathe | (~wroathe@user/wroathe) (Quit: Lost terminal) |
2022-10-09 04:03:24 +0200 | rockystone | (~rocky@user/rockymarine) |
2022-10-09 04:04:09 +0200 | ubert1 | ubert |
2022-10-09 04:07:50 +0200 | <EvanR> | functions in haskell take exactly 1 argument, no more no less. But you can add nuance to the question to get other answers |
2022-10-09 04:08:45 +0200 | <johnjaye> | ok. i see the syntax for functions is simply the name followed by the arguments |
2022-10-09 04:08:46 +0200 | waleee | (~waleee@2001:9b0:213:7200:cc36:a556:b1e8:b340) (Ping timeout: 260 seconds) |
2022-10-09 04:08:46 +0200 | <EvanR> | for example in the definition of a function you can mention more than 1 parameter, these will be automatically curried for you |
2022-10-09 04:08:47 +0200 | jinsun | Guest8869 |
2022-10-09 04:08:47 +0200 | jinsun__ | (~jinsun@user/jinsun) |
2022-10-09 04:08:47 +0200 | Guest8869 | (~jinsun@user/jinsun) (Killed (copper.libera.chat (Nickname regained by services))) |
2022-10-09 04:08:48 +0200 | jinsun__ | jinsun |
2022-10-09 04:08:59 +0200 | <johnjaye> | so you can have expressions like f x + g x y z + h w u |
2022-10-09 04:09:06 +0200 | <johnjaye> | oh ok |
2022-10-09 04:09:21 +0200 | <EvanR> | in g x y z the grouping looks like ((g x) y) z |
2022-10-09 04:09:23 +0200 | <johnjaye> | the lack of ( and ) is very strange. |
2022-10-09 04:09:57 +0200 | <EvanR> | to the parser |
2022-10-09 04:10:02 +0200 | <johnjaye> | i assume there's *some* reason every imperative language i've ever seen uses f() and not this way |
2022-10-09 04:10:21 +0200 | rockystone | (~rocky@user/rockymarine) (Ping timeout: 252 seconds) |
2022-10-09 04:10:47 +0200 | <EvanR> | while imperative languages have multi-argument functions, they don't have convenient currying |
2022-10-09 04:10:58 +0200 | <johnjaye> | meaning, how does the parser know how to parse it without them |
2022-10-09 04:11:08 +0200 | <EvanR> | for example g x y z is valid, but also g x y and g x are valid. Which can be convenient |
2022-10-09 04:11:37 +0200 | <EvanR> | g x y z can be parsed just like 2 + 3 + 4 + 5, because of associativity rules |
2022-10-09 04:11:38 +0200 | <king_gs> | geekosaur: Unless you give AI's capacity to compete with humans for scarce resources. That won't happen. |
2022-10-09 04:11:39 +0200 | jinsun | (~jinsun@user/jinsun) (Read error: Connection reset by peer) |
2022-10-09 04:11:49 +0200 | rockystone | (~rocky@user/rockymarine) |
2022-10-09 04:12:00 +0200 | <johnjaye> | i guess y better not be it's own function and variable at once, or g x y z could be ambiguous |
2022-10-09 04:12:02 +0200 | <EvanR> | + takes 2 arguments, but 2 + 3 + 4 + 5 can still be parsed without parens |
2022-10-09 04:12:04 +0200 | jinsun | (~jinsun@user/jinsun) |
2022-10-09 04:12:13 +0200 | <EvanR> | y can be a function |
2022-10-09 04:12:28 +0200 | <EvanR> | remember it's the same as typing ((g x) y) z |
2022-10-09 04:12:38 +0200 | <EvanR> | y doesn't get any arguments there |
2022-10-09 04:12:48 +0200 | <johnjaye> | hmm. |
2022-10-09 04:13:11 +0200 | <EvanR> | if you wanted to call y in the process of calling g you could do |
2022-10-09 04:13:14 +0200 | <johnjaye> | so how do you write something complex like f(x,g(h,k)). |
2022-10-09 04:13:16 +0200 | <EvanR> | g x (y 9) z |
2022-10-09 04:13:19 +0200 | <johnjaye> | i guess that is f x g h k |
2022-10-09 04:13:33 +0200 | mixphix | (~mixphix@bras-base-otwaon237cw-grc-11-174-91-129-69.dsl.bell.ca) (Ping timeout: 268 seconds) |
2022-10-09 04:13:35 +0200 | <johnjaye> | oh weird. ok |
2022-10-09 04:13:38 +0200 | <EvanR> | f x (g h x) |
2022-10-09 04:13:43 +0200 | <EvanR> | oops |
2022-10-09 04:13:44 +0200 | <johnjaye> | that looks vaguely lispish |
2022-10-09 04:13:50 +0200 | <EvanR> | yeah it does at first |
2022-10-09 04:14:03 +0200 | <johnjaye> | but the parens are strictly syntactic here? |
2022-10-09 04:14:07 +0200 | <johnjaye> | just for grouping? |
2022-10-09 04:14:09 +0200 | <EvanR> | but in Haskell, x, (x), ((x)), (((x))) are all the same |
2022-10-09 04:14:15 +0200 | <EvanR> | it's just for grouping |
2022-10-09 04:14:36 +0200 | <EvanR> | and we like to remove parens if they aren't necessary |
2022-10-09 04:14:46 +0200 | <johnjaye> | bizarrely the interpreter does in fact accept ((2+2)) as valid. |
2022-10-09 04:14:49 +0200 | <johnjaye> | ok then |
2022-10-09 04:15:13 +0200 | <johnjaye> | i get a bit suspicious when a language suddenly does something incredible like that with no explanation |
2022-10-09 04:15:25 +0200 | <johnjaye> | it raises the obvious reply, why aren't other language doing that |
2022-10-09 04:15:44 +0200 | <EvanR> | other languages have been stealing stuff from haskell, actually |
2022-10-09 04:15:58 +0200 | <EvanR> | but parentheses isn't really groundbreaking |
2022-10-09 04:16:10 +0200 | vaibhavsagar[m] | (~vaibhavsa@2001:470:69fc:105::ffe) |
2022-10-09 04:16:12 +0200 | <johnjaye> | so it's this implicit currying idea that's doing the work? |
2022-10-09 04:16:29 +0200 | <EvanR> | look at the type of drop |
2022-10-09 04:16:32 +0200 | <EvanR> | :t drop |
2022-10-09 04:16:33 +0200 | <lambdabot> | Int -> [a] -> [a] |
2022-10-09 04:16:35 +0200 | nate1 | (~nate@98.45.169.16) (Ping timeout: 252 seconds) |
2022-10-09 04:16:42 +0200 | <EvanR> | the currying is evident in the type here |
2022-10-09 04:16:50 +0200 | <EvanR> | instead of drop :: (Int, [a]) -> [a] |
2022-10-09 04:17:17 +0200 | <EvanR> | note the lack of parentheses in the type, this time it associates the other direction |
2022-10-09 04:17:24 +0200 | <EvanR> | drop :: Int -> ([a] -> [a]) |
2022-10-09 04:17:31 +0200 | rockystone | (~rocky@user/rockymarine) (Ping timeout: 260 seconds) |
2022-10-09 04:17:33 +0200 | <Neosake[m]> | Plus it is funny that people say "Programming" is not mathematical either. Funny enough, it is just a very thick level of abstraction between the two. |
2022-10-09 04:17:35 +0200 | <EvanR> | drop is a function of 1 argument which returns a function (of 1 argument) |
2022-10-09 04:17:54 +0200 | <EvanR> | you'll see this a lot if you look at the types, which you should |
2022-10-09 04:18:49 +0200 | edrx | (~Eduardo@2804:56c:d2d3:4800:cf7d:b421:4c3a:392e) |
2022-10-09 04:18:58 +0200 | <Neosake[m]> | Plus most of this haskell stuff I do not know. I am an absolute rookie. xD |
2022-10-09 04:19:31 +0200 | <johnjaye> | Neosake[m]: ironically math is often seen as 'not programming' either. when i was looking for books on category theory the first thing i asked is how to do computations about them |
2022-10-09 04:19:52 +0200 | frost | (~frost@user/frost) |
2022-10-09 04:19:55 +0200 | <edrx> | @cabal-install |
2022-10-09 04:19:55 +0200 | <lambdabot> | Unknown command, try @list |
2022-10-09 04:20:00 +0200 | <edrx> | oops |
2022-10-09 04:20:33 +0200 | <johnjaye> | EvanR: i do look at the types but I'm not that familiar with haskell yet. |
2022-10-09 04:20:38 +0200 | rockystone | (~rocky@user/rockymarine) |
2022-10-09 04:20:59 +0200 | <johnjaye> | so the idea is that drop "really" takes the one argument. but gets automatically curried to take 2 |
2022-10-09 04:21:23 +0200 | <EvanR> | if you pass it 2, it still works |
2022-10-09 04:21:44 +0200 | <EvanR> | because it's like doing (drop 3) [1,2,3,4] |
2022-10-09 04:22:03 +0200 | <Neosake[m]> | johnjaye: Which is honestly crazy because Computer's were essentially math wizards in the day. Now it is just an extension of the mathematical conventions. |
2022-10-09 04:22:07 +0200 | <EvanR> | but also drop 3 is a useful function in itself |
2022-10-09 04:22:11 +0200 | <johnjaye> | prelude says no instance for (Show ([a0] -> [a0])) |
2022-10-09 04:22:24 +0200 | <EvanR> | yeah you can't show functions normally |
2022-10-09 04:22:32 +0200 | <probie> | That doesn't meant it's not a valid function, just that it's not a printable value |
2022-10-09 04:22:48 +0200 | nate1 | (~nate@98.45.169.16) |
2022-10-09 04:22:54 +0200 | <edrx> | people, what are your favorite links about cabal-install? I'm updating this page - http://angg.twu.net/eev-haskell.html ... |
2022-10-09 04:23:06 +0200 | <johnjaye> | ah. prelude does accept (drop 3) [1,2,3,4,5] |
2022-10-09 04:23:06 +0200 | wroathe | (~wroathe@206-55-188-8.fttp.usinternet.com) |
2022-10-09 04:23:07 +0200 | wroathe | (~wroathe@206-55-188-8.fttp.usinternet.com) (Changing host) |
2022-10-09 04:23:07 +0200 | wroathe | (~wroathe@user/wroathe) |
2022-10-09 04:23:24 +0200 | <Neosake[m]> | Also, any fellow NixOS users? |
2022-10-09 04:23:39 +0200 | <johnjaye> | Neosake[m]: i'm an aspiring nixos user. but somehow i never find the time to actually do it. |
2022-10-09 04:23:42 +0200 | jakalx | (~jakalx@base.jakalx.net) (Error from remote client) |
2022-10-09 04:23:49 +0200 | <johnjaye> | i'm afraid it will choke if i try it on actual hardware |
2022-10-09 04:24:10 +0200 | <Neosake[m]> | Interesting, I've had nothing but good experiences on live hardware |
2022-10-09 04:25:28 +0200 | <probie> | You can also use `drop 3`, anywhere a function of type `[a] -> [a]` can go without needing to do something like `\x -> drop 3 x` |
2022-10-09 04:25:33 +0200 | jakalx | (~jakalx@base.jakalx.net) |
2022-10-09 04:25:34 +0200 | <probie> | > map (drop 3) [[1..5], [6..10], [10..15]] |
2022-10-09 04:25:36 +0200 | <lambdabot> | [[4,5],[9,10],[13,14,15]] |
2022-10-09 04:25:42 +0200 | <EvanR> | johnjaye, in haskell you can get a lot out of "things that don't change the meaning of this code" |
2022-10-09 04:25:58 +0200 | <EvanR> | which I guess you can call "laws" |
2022-10-09 04:26:31 +0200 | <EvanR> | redundant parentheses is a simple example |
2022-10-09 04:26:34 +0200 | <Neosake[m]> | I will be back in a bit. Gonna go back to reading the wikibooks |
2022-10-09 04:26:38 +0200 | <johnjaye> | well. i'm not advanced enough to grasp why you would need to write \x -> drop 3 x |
2022-10-09 04:26:45 +0200 | <johnjaye> | from lisp i can see what the intention is though |
2022-10-09 04:26:59 +0200 | <EvanR> | sometimes an `x' can be introduced to make something clearer |
2022-10-09 04:27:05 +0200 | <EvanR> | drop 3 is already pretty clear though |
2022-10-09 04:27:18 +0200 | <EvanR> | other times, removing the x can make it very unclear |
2022-10-09 04:27:22 +0200 | <johnjaye> | yes. but only after you explained it. |
2022-10-09 04:27:23 +0200 | <EvanR> | we have a command for that |
2022-10-09 04:27:23 +0200 | <johnjaye> | heh |
2022-10-09 04:27:31 +0200 | <EvanR> | @pl \x -> drop 3 x |
2022-10-09 04:27:31 +0200 | <lambdabot> | drop 3 |
2022-10-09 04:28:08 +0200 | <EvanR> | @pl \x -> 9 + x * 2 |
2022-10-09 04:28:09 +0200 | <lambdabot> | (9 +) . (2 *) |
2022-10-09 04:28:27 +0200 | <EvanR> | well, I can't come up with a really bad one |
2022-10-09 04:28:36 +0200 | nate1 | (~nate@98.45.169.16) (Ping timeout: 260 seconds) |
2022-10-09 04:28:49 +0200 | <johnjaye> | haskell does feel very mathematical i'll grant that though. |
2022-10-09 04:29:06 +0200 | <johnjaye> | in the sense of, packing large abstractions into a single character 'x' or 'f' |
2022-10-09 04:29:29 +0200 | <johnjaye> | like how the entire theory of the reimann integral is encoded into what is essentially an elongated S |
2022-10-09 04:29:38 +0200 | <EvanR> | haskell is cool for have... lets say... actual abstractions, like they actually work |
2022-10-09 04:29:42 +0200 | <EvanR> | and it's not just a vague analogy |
2022-10-09 04:29:47 +0200 | <EvanR> | having* |
2022-10-09 04:30:12 +0200 | <johnjaye> | yeah. i feel like once i get to know the syntax a bit better it would be like that |
2022-10-09 04:30:38 +0200 | mixphix | (~mixphix@bras-base-otwaon237cw-grc-11-174-91-129-69.dsl.bell.ca) |
2022-10-09 04:31:15 +0200 | <johnjaye> | thanks for the explanation |
2022-10-09 04:31:22 +0200 | <EvanR> | np |
2022-10-09 04:33:01 +0200 | <probie> | @pl \x y -> (2*x) == (x-y) |
2022-10-09 04:33:01 +0200 | <lambdabot> | ap ((.) . (==) . (2 *)) (-) |
2022-10-09 04:33:49 +0200 | <EvanR> | that's a good example of why you'd write ap ((.) . (==) . (2 *)) (-) as \x y -> 2*x == x-y |
2022-10-09 04:34:10 +0200 | burnsidesLlama | (~burnsides@client-8-86.eduroam.oxuni.org.uk) (Ping timeout: 265 seconds) |
2022-10-09 04:35:03 +0200 | <EvanR> | composition chains are cool, but two of the things in that chain are notionally "binary operators" xD |
2022-10-09 04:35:08 +0200 | mixphix | (~mixphix@bras-base-otwaon237cw-grc-11-174-91-129-69.dsl.bell.ca) (Ping timeout: 268 seconds) |
2022-10-09 04:35:10 +0200 | <EvanR> | making my brain hurt |
2022-10-09 04:35:37 +0200 | FinnElija | (~finn_elij@user/finn-elija/x-0085643) (Killed (NickServ (Forcing logout FinnElija -> finn_elija))) |
2022-10-09 04:35:37 +0200 | FinnElija | (~finn_elij@user/finn-elija/x-0085643) |
2022-10-09 04:37:15 +0200 | <edrx> | EvanR: I'm using these kinds of diagrams to understand the types of subexpressions - http://angg.twu.net/HASKELL/Applicative1.hs.html - and they're helping me a lot... |
2022-10-09 04:37:59 +0200 | <EvanR> | whoa |
2022-10-09 04:38:36 +0200 | <edrx> | =) |
2022-10-09 04:43:00 +0200 | terrorjack | (~terrorjac@2a01:4f8:1c1e:509a::1) (Quit: The Lounge - https://thelounge.chat) |
2022-10-09 04:44:20 +0200 | terrorjack | (~terrorjac@2a01:4f8:1c1e:509a::1) |
2022-10-09 04:44:58 +0200 | lovebug | rosalind |
2022-10-09 04:45:04 +0200 | <johnjaye> | echo -sh http://angg.twu.net/HASKELL/Applicative1.hs.html > /tmp/a |
2022-10-09 04:46:20 +0200 | <edrx> | what is /tmp/a? |
2022-10-09 04:46:39 +0200 | <johnjaye> | shortest filename i can think of. weechat is being stubborn and won't let me save the link properly |
2022-10-09 04:46:39 +0200 | <edrx> | btw, the non-htmlized version is here: http://angg.twu.net/HASKELL/Applicative1.hs |
2022-10-09 04:46:52 +0200 | <edrx> | ok |
2022-10-09 04:47:16 +0200 | rockystone | (~rocky@user/rockymarine) (Ping timeout: 260 seconds) |
2022-10-09 04:47:26 +0200 | mixphix | (~mixphix@bras-base-otwaon237cw-grc-11-174-91-129-69.dsl.bell.ca) |
2022-10-09 04:47:47 +0200 | <johnjaye> | ah i had params switched. now i have it. |
2022-10-09 04:48:41 +0200 | <ski> | johnjaye : "but gets automatically curried to take 2" -- currying only exists in your head, not in Haskell |
2022-10-09 04:48:52 +0200 | <ski> | "things that don't change the meaning of this code" -- refactorings |
2022-10-09 04:49:41 +0200 | <johnjaye> | i see |
2022-10-09 04:50:26 +0200 | <ski> | currying is one way to represent/encode "multiple parameter functions", (e.g.) in a context which only has "single parameter functions" (like Haskell) |
2022-10-09 04:51:16 +0200 | <ski> | "tupling" is another way to do that. packing the "multiple parameters" into a single aggregate/compound. e.g. a tuple, but could be a record/`struct', or even a list, or finite map, or set or bag or .. |
2022-10-09 04:51:39 +0200 | <ski> | Haskell does not "have currying" |
2022-10-09 04:52:24 +0200 | <EvanR> | let f x y = [x,x,y] in ..., looks like a multiple parameter function, so in a way they are supported, or avoided by currying on your behalf |
2022-10-09 04:52:24 +0200 | mixphix | (~mixphix@bras-base-otwaon237cw-grc-11-174-91-129-69.dsl.bell.ca) (Ping timeout: 268 seconds) |
2022-10-09 04:52:45 +0200 | <ski> | what Haskell does have, is a syntax (including precedence and fixity) which is specially designed to make it fairly syntactically easy/painless to encode functions curriedly |
2022-10-09 04:54:06 +0200 | <EvanR> | :t uncurry |
2022-10-09 04:54:07 +0200 | <lambdabot> | (a -> b -> c) -> (a, b) -> c |
2022-10-09 04:54:20 +0200 | <ski> | but `f x y = ...' is basically the same as `(define f (lambda (x) (lambda (y) ...)))' in Scheme (although Scheme *does* have a primitive notion of "multiple parameter (also result ..) procedures" .. but you can still use currying, as well as tupling, in Scheme too) |
2022-10-09 04:54:37 +0200 | <ski> | @type curry |
2022-10-09 04:54:38 +0200 | <lambdabot> | ((a, b) -> c) -> a -> b -> c |
2022-10-09 04:54:56 +0200 | <EvanR> | funny I've never used curry xD |
2022-10-09 04:55:22 +0200 | <ski> | it's interesting to note that `curry' can be thought of as a three-parameter function (accepting one callback function, and two additional parameters, that it tuples when calling the callback), which is expressed curriedly |
2022-10-09 04:55:54 +0200 | jmorris | (uid537181@id-537181.uxbridge.irccloud.com) |
2022-10-09 04:56:10 +0200 | <ski> | but it can also be thought of as a two-parameter function (accepting one callback function, and one parameter, returning the callback partially applied to that parameter) |
2022-10-09 04:56:30 +0200 | <ski> | in this latter form, `curry' can be thought of as `partiallyApply' |
2022-10-09 04:57:43 +0200 | <johnjaye> | i like how haskell just directly defines init/last in mirror of head/tail |
2022-10-09 04:58:08 +0200 | <ski> | however, i consider both `\y -> f (x0,y)' and `\x -> f (x,y0)' as partial applications of the tupled function `f'. just like both `g x0 = \y -> g x0 y' and `\x -> g x y0' are partial applications of the curried function `g' |
2022-10-09 04:58:47 +0200 | <ski> | EvanR : i occasionally use `curry' as an infix operator .. |
2022-10-09 04:59:21 +0200 | <ski> | map (foo `curry` x0) ys |
2022-10-09 04:59:45 +0200 | rockystone | (~rocky@user/rockymarine) |
2022-10-09 05:00:13 +0200 | razetime | (~quassel@117.193.2.178) |
2022-10-09 05:00:45 +0200 | <EvanR> | > foldl1 (\a x -> x) [1,2,3,4,99] |
2022-10-09 05:00:47 +0200 | <lambdabot> | 99 |
2022-10-09 05:00:53 +0200 | <ski> | (similarly to how i also can use `flip' in infix position) |
2022-10-09 05:01:02 +0200 | td_ | (~td@94.134.91.128) (Ping timeout: 268 seconds) |
2022-10-09 05:01:27 +0200 | jero98772 | (~jero98772@2800:484:1d80:d8ce:efcc:cbb3:7f2a:6dff) (Remote host closed the connection) |
2022-10-09 05:01:51 +0200 | <EvanR> | johnjaye, I just tried to lookup init and last, seems they have a more optimized form than @src https://hackage.haskell.org/package/base-4.17.0.0/docs/src/GHC.List.html#init |
2022-10-09 05:02:19 +0200 | td_ | (~td@94.134.91.56) |
2022-10-09 05:02:22 +0200 | <EvanR> | hah, last actually uses foldl |
2022-10-09 05:02:41 +0200 | <EvanR> | foldl gets no respect |
2022-10-09 05:02:59 +0200 | <ski> | edrx : fwiw, instead of `fmap0',`fmap1',`fmap2',`fmap3', i'd probably say `liftA0',`liftA1',`liftA2',`liftA3' (or even `liftM0',`liftM1',`liftM2',`liftM3' .. this was from before `Applicative' was a thing, though) |
2022-10-09 05:04:28 +0200 | <ski> | edrx : but yes, multiary Lispy `map' (`mapcar') is basically this, for the case of (parallel/lockstep) lists |
2022-10-09 05:04:46 +0200 | <edrx> | ski: thanks! let me see... I think that I followed the terminology from Hutton's book in some places and the terminology from the Prelude in other places... |
2022-10-09 05:05:10 +0200 | <ski> | > getZipList (liftA2 (+) (ZipList [2,3]) (ZipList [400,500,600])) |
2022-10-09 05:05:13 +0200 | <lambdabot> | [402,503] |
2022-10-09 05:05:21 +0200 | rockystone | (~rocky@user/rockymarine) (Ping timeout: 268 seconds) |
2022-10-09 05:06:46 +0200 | <ski> | edrx : anyway, with a little practice, you'll be making these typing diagrams in your head :) |
2022-10-09 05:07:29 +0200 | <edrx> | ski: =) |
2022-10-09 05:09:01 +0200 | wroathe | (~wroathe@user/wroathe) (Quit: Lost terminal) |
2022-10-09 05:12:22 +0200 | <ski> | @type uncurry curry |
2022-10-09 05:12:24 +0200 | <lambdabot> | ((a, b) -> c, a) -> b -> c |
2022-10-09 05:13:17 +0200 | <c_wraith> | that function looks like a prank gone wrong |
2022-10-09 05:13:52 +0200 | <ski> | @type uncurry3 curry |
2022-10-09 05:13:54 +0200 | <lambdabot> | ((a, b) -> t4, a, b) -> t4 |
2022-10-09 05:14:09 +0200 | <ski> | heh :) |
2022-10-09 05:14:56 +0200 | nate1 | (~nate@98.45.169.16) |
2022-10-09 05:17:29 +0200 | <EvanR> | (a,b) -> c,a |
2022-10-09 05:17:37 +0200 | <EvanR> | uncromulent |
2022-10-09 05:18:14 +0200 | <EvanR> | (but is actually right in agda) |
2022-10-09 05:18:23 +0200 | wroathe | (~wroathe@206-55-188-8.fttp.usinternet.com) |
2022-10-09 05:18:23 +0200 | wroathe | (~wroathe@206-55-188-8.fttp.usinternet.com) (Changing host) |
2022-10-09 05:18:23 +0200 | wroathe | (~wroathe@user/wroathe) |
2022-10-09 05:18:24 +0200 | [_] | (~itchyjunk@user/itchyjunk/x-7353470) |
2022-10-09 05:21:03 +0200 | [itchyjunk] | (~itchyjunk@user/itchyjunk/x-7353470) (Ping timeout: 265 seconds) |
2022-10-09 05:21:51 +0200 | ski | wishes GHC would elide the spaces after the commas, there .. |
2022-10-09 05:25:24 +0200 | nate1 | (~nate@98.45.169.16) (Ping timeout: 265 seconds) |
2022-10-09 05:25:43 +0200 | rockystone | (~rocky@user/rockymarine) |
2022-10-09 05:26:22 +0200 | mixphix | (~mixphix@bras-base-otwaon237cw-grc-11-174-91-129-69.dsl.bell.ca) |
2022-10-09 05:31:01 +0200 | mixphix | (~mixphix@bras-base-otwaon237cw-grc-11-174-91-129-69.dsl.bell.ca) (Ping timeout: 260 seconds) |
2022-10-09 05:35:08 +0200 | zmt00 | (~zmt00@user/zmt00) (Read error: Connection reset by peer) |
2022-10-09 05:35:14 +0200 | nate1 | (~nate@98.45.169.16) |
2022-10-09 05:37:45 +0200 | zmt00 | (~zmt00@user/zmt00) |
2022-10-09 05:39:39 +0200 | dtman34 | (~dtman34@c-75-73-141-79.hsd1.mn.comcast.net) |
2022-10-09 05:41:07 +0200 | nate1 | (~nate@98.45.169.16) (Ping timeout: 268 seconds) |
2022-10-09 05:44:13 +0200 | king_gs | (~Thunderbi@2806:103e:29:c5:4fb1:a8c9:906f:c6e0) (Ping timeout: 246 seconds) |
2022-10-09 05:50:09 +0200 | nate1 | (~nate@98.45.169.16) |
2022-10-09 05:51:36 +0200 | razetime | (~quassel@117.193.2.178) (Ping timeout: 268 seconds) |
2022-10-09 05:56:48 +0200 | Topsi | (~Topsi@dyndsl-095-033-089-091.ewe-ip-backbone.de) (Read error: Connection reset by peer) |
2022-10-09 06:00:11 +0200 | mixphix | (~mixphix@bras-base-otwaon237cw-grc-11-174-91-129-69.dsl.bell.ca) |
2022-10-09 06:01:39 +0200 | nate1 | (~nate@98.45.169.16) (Ping timeout: 265 seconds) |
2022-10-09 06:02:12 +0200 | rosalind | lys |
2022-10-09 06:05:23 +0200 | Lemniscate | Sauvin |
2022-10-09 06:07:54 +0200 | Franciman | (~Franciman@mx1.fracta.dev) (Read error: Connection reset by peer) |
2022-10-09 06:08:50 +0200 | zebrag | (~chris@user/zebrag) (Quit: Konversation terminated!) |
2022-10-09 06:09:14 +0200 | king_gs | (~Thunderbi@187.201.131.180) |
2022-10-09 06:09:31 +0200 | rockystone | (~rocky@user/rockymarine) (Ping timeout: 260 seconds) |
2022-10-09 06:13:36 +0200 | king_gs | (~Thunderbi@187.201.131.180) (Ping timeout: 260 seconds) |
2022-10-09 06:14:10 +0200 | <dolio> | In Agda a,b is a single identifier. |
2022-10-09 06:18:08 +0200 | Franciman | (~Franciman@mx1.fracta.dev) |
2022-10-09 06:19:57 +0200 | coot | (~coot@213.134.171.3) |
2022-10-09 06:20:10 +0200 | <probie> | Off-topic, but I'd always assumed it'd be incromulent instead of uncromulent, since "lent" feels like the ending for a Latin derived word |
2022-10-09 06:22:46 +0200 | rockystone | (~rocky@user/rockymarine) |
2022-10-09 06:24:32 +0200 | wroathe | (~wroathe@user/wroathe) (Quit: Lost terminal) |
2022-10-09 06:26:45 +0200 | mixphix | (~mixphix@bras-base-otwaon237cw-grc-11-174-91-129-69.dsl.bell.ca) (Ping timeout: 252 seconds) |
2022-10-09 06:30:19 +0200 | <edrx> | where is the module System.Process defined? |
2022-10-09 06:31:16 +0200 | wroathe | (~wroathe@206-55-188-8.fttp.usinternet.com) |
2022-10-09 06:31:16 +0200 | wroathe | (~wroathe@206-55-188-8.fttp.usinternet.com) (Changing host) |
2022-10-09 06:31:16 +0200 | wroathe | (~wroathe@user/wroathe) |
2022-10-09 06:31:39 +0200 | <edrx> | I guess that in some preprocessed file, but my grepping tools don't work on them yet... =( |
2022-10-09 06:32:29 +0200 | <probie> | Do you mean https://github.com/haskell/process/blob/master/System/Process.hs ? |
2022-10-09 06:34:35 +0200 | <edrx> | probie: oops, yes - thanks, I just found what I need to fix... |
2022-10-09 06:37:44 +0200 | razetime | (~quassel@117.193.2.178) |
2022-10-09 06:40:28 +0200 | mixphix | (~mixphix@bras-base-otwaon237cw-grc-11-174-91-129-69.dsl.bell.ca) |
2022-10-09 06:45:09 +0200 | mixphix | (~mixphix@bras-base-otwaon237cw-grc-11-174-91-129-69.dsl.bell.ca) (Ping timeout: 265 seconds) |
2022-10-09 06:45:27 +0200 | <VarikValefor[m]> | Testing... |
2022-10-09 06:46:00 +0200 | king_gs | (~Thunderbi@187.201.131.180) |
2022-10-09 06:46:55 +0200 | xff0x | (~xff0x@ai071162.d.east.v6connect.net) (Ping timeout: 252 seconds) |
2022-10-09 06:47:18 +0200 | xff0x | (~xff0x@ai071162.d.east.v6connect.net) |
2022-10-09 06:48:00 +0200 | <EvanR> | pong |
2022-10-09 06:48:10 +0200 | lys | rosalind |
2022-10-09 06:48:43 +0200 | <edrx> | pung |
2022-10-09 06:49:05 +0200 | [_] | (~itchyjunk@user/itchyjunk/x-7353470) (Remote host closed the connection) |
2022-10-09 06:50:28 +0200 | king_gs | (~Thunderbi@187.201.131.180) (Ping timeout: 265 seconds) |
2022-10-09 06:54:48 +0200 | mbuf | (~Shakthi@49.204.141.204) |
2022-10-09 06:55:19 +0200 | incertia | (~incertia@d47-69-133-171.try.wideopenwest.com) (Quit: ZNC 1.7.5 - https://znc.in) |
2022-10-09 07:00:19 +0200 | Luj | (~Luj@2a01:e0a:5f9:9681:43e9:ccab:b409:cf4f) (Quit: Ping timeout (120 seconds)) |
2022-10-09 07:00:24 +0200 | <edrx> | hey, I tried this program - https://lotz84.github.io/haskellbyexample/ex/spawning-processes - and it does compile and run, but I need to give it a ^D... |
2022-10-09 07:00:32 +0200 | <edrx> | how do I make it end by itself? |
2022-10-09 07:00:36 +0200 | Luj | (~Luj@2a01:e0a:5f9:9681:5880:c9ff:fe9f:3dfb) |
2022-10-09 07:02:19 +0200 | <probie> | maybe `hClose hin`? |
2022-10-09 07:02:29 +0200 | <EvanR> | I blocked on grep hello |
2022-10-09 07:03:05 +0200 | <edrx> | let me see |
2022-10-09 07:03:45 +0200 | <EvanR> | note hGetContents is a big weird in that it returns list generated by "lazy I/O" (scare quotes) |
2022-10-09 07:03:49 +0200 | <EvanR> | bit* |
2022-10-09 07:06:37 +0200 | <edrx> | where should I put the hClose hin? I tried this - https://0x0.st/otAd.txt - and got the same bahavior... |
2022-10-09 07:10:02 +0200 | <edrx> | hmm, it seems that withCreateProcess does the expected clean-ups... |
2022-10-09 07:10:50 +0200 | <EvanR> | which part does it hang on |
2022-10-09 07:11:25 +0200 | <EvanR> | if it's reading stdin, then it's waiting for end of file, i.e. control D |
2022-10-09 07:12:20 +0200 | <edrx> | look: https://i.ibb.co/r3QfQZ2/sshot.png |
2022-10-09 07:13:40 +0200 | <EvanR> | yeah I hang on grep hello |
2022-10-09 07:13:53 +0200 | <EvanR> | seems like your grep command just isn't right |
2022-10-09 07:14:07 +0200 | <probie> | after `hPutStr` (for grep) |
2022-10-09 07:14:15 +0200 | FinnElija | (~finn_elij@user/finn-elija/x-0085643) (Remote host closed the connection) |
2022-10-09 07:14:38 +0200 | wroathe | (~wroathe@user/wroathe) (Ping timeout: 265 seconds) |
2022-10-09 07:14:46 +0200 | <probie> | No input is being sent to grep (it's waiting for a flush, either directly, or from a close), so there's nothing to print |
2022-10-09 07:14:59 +0200 | FinnElija | (~finn_elij@user/finn-elija/x-0085643) |
2022-10-09 07:15:29 +0200 | <probie> | s/No input/Only "hello grep"/ |
2022-10-09 07:15:53 +0200 | <edrx> | probie: trying |
2022-10-09 07:16:41 +0200 | <edrx> | probie: perfect! thanks! =) |
2022-10-09 07:17:07 +0200 | <EvanR> | just grepping into the wind xD |
2022-10-09 07:19:55 +0200 | rockystone | (~rocky@user/rockymarine) (Ping timeout: 252 seconds) |
2022-10-09 07:22:28 +0200 | rockystone | (~rocky@user/rockymarine) |
2022-10-09 07:25:41 +0200 | mixphix | (~mixphix@bras-base-otwaon237cw-grc-11-174-91-129-69.dsl.bell.ca) |
2022-10-09 07:30:16 +0200 | mixphix | (~mixphix@bras-base-otwaon237cw-grc-11-174-91-129-69.dsl.bell.ca) (Ping timeout: 268 seconds) |
2022-10-09 07:32:01 +0200 | raym | (~aritra@user/raym) (Ping timeout: 252 seconds) |
2022-10-09 07:33:03 +0200 | raym | (~aritra@user/raym) |
2022-10-09 07:34:05 +0200 | <edrx> | http://angg.twu.net/HASKELL/Tac1.hs.html |
2022-10-09 07:34:48 +0200 | <edrx> | that's my first non-trivial program with IO, btw =) =) =) |
2022-10-09 07:35:23 +0200 | <EvanR> | oh now I get it, hin is the output xD |
2022-10-09 07:35:42 +0200 | <EvanR> | yeah must be closed on this end to finish the process |
2022-10-09 07:36:17 +0200 | <EvanR> | what's in and what's out gets confusing when doing subprocess |
2022-10-09 07:48:41 +0200 | machinedgod | (~machinedg@d198-53-218-113.abhsia.telus.net) (Ping timeout: 260 seconds) |
2022-10-09 07:53:17 +0200 | arahael | (~arahael@203.217.43.212) (Ping timeout: 252 seconds) |
2022-10-09 07:55:52 +0200 | nate1 | (~nate@98.45.169.16) |
2022-10-09 08:00:37 +0200 | nate1 | (~nate@98.45.169.16) (Ping timeout: 252 seconds) |
2022-10-09 08:06:39 +0200 | arahael | (~arahael@61.68.183.79) |
2022-10-09 08:12:06 +0200 | tromp | (~textual@92-110-219-57.cable.dynamic.v4.ziggo.nl) |
2022-10-09 08:17:51 +0200 | jao | (~jao@cpc103048-sgyl39-2-0-cust502.18-2.cable.virginm.net) (Ping timeout: 252 seconds) |
2022-10-09 08:17:53 +0200 | rosalind | lys |
2022-10-09 08:20:42 +0200 | <edrx> | EvanR: hin is the handle or the stdin of the process |
2022-10-09 08:21:12 +0200 | <edrx> | or did you mean that I should close its stdout too? |
2022-10-09 08:22:19 +0200 | tromp | (~textual@92-110-219-57.cable.dynamic.v4.ziggo.nl) (Quit: My iMac has gone to sleep. ZZZzzz…) |
2022-10-09 08:22:25 +0200 | chomwitt | (~chomwitt@2a02:587:dc0c:c200:442:40c1:9d7f:23d1) |
2022-10-09 08:29:33 +0200 | rockystone | (~rocky@user/rockymarine) (Ping timeout: 265 seconds) |
2022-10-09 08:30:43 +0200 | nate1 | (~nate@98.45.169.16) |
2022-10-09 08:35:22 +0200 | nate1 | (~nate@98.45.169.16) (Ping timeout: 246 seconds) |
2022-10-09 08:39:43 +0200 | tromp | (~textual@92-110-219-57.cable.dynamic.v4.ziggo.nl) |
2022-10-09 08:40:44 +0200 | <edrx> | time to crash! |
2022-10-09 08:40:47 +0200 | <edrx> | gnight all =) |
2022-10-09 08:40:50 +0200 | edrx | (~Eduardo@2804:56c:d2d3:4800:cf7d:b421:4c3a:392e) (Killed buffer) |
2022-10-09 08:44:05 +0200 | rockystone | (~rocky@user/rockymarine) |
2022-10-09 08:44:46 +0200 | FinnElija | (~finn_elij@user/finn-elija/x-0085643) (Remote host closed the connection) |
2022-10-09 08:45:41 +0200 | FinnElija | (~finn_elij@user/finn-elija/x-0085643) |
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2022-10-09 08:47:25 +0200 | mixphix | (~mixphix@bras-base-otwaon237cw-grc-11-174-91-129-69.dsl.bell.ca) |
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2022-10-09 09:05:48 +0200 | acidjnk | (~acidjnk@p200300d6e7137a48695c1121120f860b.dip0.t-ipconnect.de) |
2022-10-09 09:09:43 +0200 | takuan | (~takuan@178-116-218-225.access.telenet.be) |
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2022-10-09 09:16:23 +0200 | Tuplanolla | (~Tuplanoll@91-159-69-34.elisa-laajakaista.fi) |
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2022-10-09 09:19:25 +0200 | eggplantade | (~Eggplanta@2600:1700:38c5:d800:50e1:7448:ac98:298f) (Remote host closed the connection) |
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2022-10-09 09:40:03 +0200 | mixphix | (~mixphix@bras-base-otwaon237cw-grc-11-174-91-129-69.dsl.bell.ca) |
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2022-10-09 09:44:42 +0200 | mixphix | (~mixphix@bras-base-otwaon237cw-grc-11-174-91-129-69.dsl.bell.ca) (Ping timeout: 268 seconds) |
2022-10-09 09:49:01 +0200 | Lycurgus | (~juan@user/Lycurgus) |
2022-10-09 09:59:34 +0200 | Lycurgus | (~juan@user/Lycurgus) (Quit: Exeunt juan@acm.org) |
2022-10-09 10:00:13 +0200 | nate1 | (~nate@98.45.169.16) |
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2022-10-09 10:09:12 +0200 | Franciman | (~Franciman@mx1.fracta.dev) (Read error: Connection reset by peer) |
2022-10-09 10:11:55 +0200 | zaquest | (~notzaques@5.130.79.72) (Remote host closed the connection) |
2022-10-09 10:13:08 +0200 | wootehfoot | (~wootehfoo@user/wootehfoot) |
2022-10-09 10:16:48 +0200 | bendo | (~bendo@fire-ara4.tngtech.com) |
2022-10-09 10:18:27 +0200 | Franciman | (~Franciman@mx1.fracta.dev) |
2022-10-09 10:19:56 +0200 | eggplantade | (~Eggplanta@2600:1700:38c5:d800:50e1:7448:ac98:298f) |
2022-10-09 10:23:26 +0200 | sudden | (~cat@user/sudden) |
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2022-10-09 10:26:47 +0200 | Vajb | (~Vajb@85-76-75-28-nat.elisa-mobile.fi) (Read error: Connection reset by peer) |
2022-10-09 10:27:28 +0200 | Vajb | (~Vajb@hag-jnsbng11-58c3a5-27.dhcp.inet.fi) |
2022-10-09 10:33:20 +0200 | Vajb | (~Vajb@hag-jnsbng11-58c3a5-27.dhcp.inet.fi) (Read error: Connection reset by peer) |
2022-10-09 10:34:51 +0200 | burnsidesLlama | (~burnsides@client-8-86.eduroam.oxuni.org.uk) |
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2022-10-09 10:37:55 +0200 | razetime | (~quassel@117.193.2.178) |
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2022-10-09 10:44:37 +0200 | zxx7529 | (~Thunderbi@user/zxx7529) |
2022-10-09 10:49:31 +0200 | Sgeo | (~Sgeo@user/sgeo) (Read error: Connection reset by peer) |
2022-10-09 10:53:54 +0200 | zaquest | (~notzaques@5.130.79.72) |
2022-10-09 10:55:23 +0200 | mixphix | (~mixphix@bras-base-otwaon237cw-grc-11-174-91-129-69.dsl.bell.ca) |
2022-10-09 10:59:33 +0200 | mixphix | (~mixphix@bras-base-otwaon237cw-grc-11-174-91-129-69.dsl.bell.ca) (Ping timeout: 252 seconds) |
2022-10-09 11:03:16 +0200 | zxx7529 | (~Thunderbi@user/zxx7529) (Quit: zxx7529) |
2022-10-09 11:17:17 +0200 | razetime | (~quassel@117.193.2.178) (Remote host closed the connection) |
2022-10-09 11:22:13 +0200 | jakalx | (~jakalx@base.jakalx.net) () |
2022-10-09 11:24:11 +0200 | jakalx | (~jakalx@base.jakalx.net) |
2022-10-09 11:27:17 +0200 | mixphix | (~mixphix@bras-base-otwaon237cw-grc-11-174-91-129-69.dsl.bell.ca) |
2022-10-09 11:29:59 +0200 | kdaishi | (~Thunderbi@94.191.136.219.mobile.tre.se) |
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2022-10-09 11:31:49 +0200 | bendo | (~bendo@fire-ara4.tngtech.com) (Ping timeout: 252 seconds) |
2022-10-09 11:31:56 +0200 | mixphix | (~mixphix@bras-base-otwaon237cw-grc-11-174-91-129-69.dsl.bell.ca) (Ping timeout: 268 seconds) |
2022-10-09 11:32:43 +0200 | titibandit | (~titibandi@xdsl-89-0-65-2.nc.de) |
2022-10-09 11:41:05 +0200 | vorpuni | (~pvorp@2001:861:3881:c690:6d4:662c:a06a:ef29) |
2022-10-09 11:47:51 +0200 | mbuf | (~Shakthi@49.204.141.204) (Quit: Leaving) |
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2022-10-09 11:58:53 +0200 | econo | (uid147250@user/econo) (Quit: Connection closed for inactivity) |
2022-10-09 11:58:54 +0200 | causal | (~user@50.35.83.177) |
2022-10-09 11:59:48 +0200 | chomwitt | (~chomwitt@2a02:587:dc0c:c200:442:40c1:9d7f:23d1) (Ping timeout: 264 seconds) |
2022-10-09 12:05:14 +0200 | jakalx | (~jakalx@base.jakalx.net) () |
2022-10-09 12:06:06 +0200 | jakalx | (~jakalx@base.jakalx.net) |
2022-10-09 12:12:10 +0200 | nate1 | (~nate@98.45.169.16) |
2022-10-09 12:14:14 +0200 | Franciman | (~Franciman@mx1.fracta.dev) (Read error: Connection reset by peer) |
2022-10-09 12:16:04 +0200 | kdaishi | (~Thunderbi@94.191.137.35.mobile.tre.se) |
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2022-10-09 12:18:28 +0200 | Franciman | (~Franciman@mx1.fracta.dev) |
2022-10-09 12:19:05 +0200 | __monty__ | (~toonn@user/toonn) |
2022-10-09 12:20:35 +0200 | freeside | (~mengwong@bb115-66-48-84.singnet.com.sg) (Ping timeout: 252 seconds) |
2022-10-09 12:21:22 +0200 | freeside | (~mengwong@103.252.202.193) |
2022-10-09 12:24:02 +0200 | gurkenglas | (~gurkengla@p548ac72e.dip0.t-ipconnect.de) |
2022-10-09 12:27:53 +0200 | kenran | (~user@user/kenran) (Remote host closed the connection) |
2022-10-09 12:30:26 +0200 | ezzieyguywuf | (~Unknown@user/ezzieyguywuf) (Ping timeout: 260 seconds) |
2022-10-09 12:31:17 +0200 | ezzieyguywuf | (~Unknown@user/ezzieyguywuf) |
2022-10-09 12:39:01 +0200 | chomwitt | (~chomwitt@2a02:587:dc0c:c200:9b5d:e3:b4f7:170c) |
2022-10-09 12:40:04 +0200 | titibandit | (~titibandi@xdsl-89-0-65-2.nc.de) (Quit: Leaving.) |
2022-10-09 12:41:33 +0200 | bendo | (~bendo@fire-ara4.tngtech.com) |
2022-10-09 12:41:51 +0200 | <dminuoso> | Is there some sneaky way to drop the s phantom of ST? It would be so much more convenient, and Ill promise not to leak state. :) |
2022-10-09 12:47:26 +0200 | mixphix | (~mixphix@bras-base-otwaon237cw-grc-11-174-91-129-69.dsl.bell.ca) |
2022-10-09 12:49:37 +0200 | gmg | (~user@user/gehmehgeh) |
2022-10-09 12:51:45 +0200 | mixphix | (~mixphix@bras-base-otwaon237cw-grc-11-174-91-129-69.dsl.bell.ca) (Ping timeout: 252 seconds) |
2022-10-09 12:53:32 +0200 | ec | (~ec@gateway/tor-sasl/ec) |
2022-10-09 12:58:06 +0200 | ec | (~ec@gateway/tor-sasl/ec) (Ping timeout: 258 seconds) |
2022-10-09 13:00:43 +0200 | titibandit | (~titibandi@xdsl-89-0-65-2.nc.de) |
2022-10-09 13:01:56 +0200 | <jackdk> | `unsafePerformIO`? But seriously, shouldn't it only become inconvenient if you're trying to break out? |
2022-10-09 13:03:31 +0200 | SoF1 | SoF |
2022-10-09 13:03:46 +0200 | burnsidesLlama | (~burnsides@client-8-86.eduroam.oxuni.org.uk) (Remote host closed the connection) |
2022-10-09 13:04:26 +0200 | lys | rosalind |
2022-10-09 13:08:20 +0200 | tromp | (~textual@92-110-219-57.cable.dynamic.v4.ziggo.nl) (Read error: Connection reset by peer) |
2022-10-09 13:14:58 +0200 | vysn | (~vysn@user/vysn) |
2022-10-09 13:16:07 +0200 | Topsi | (~Topsi@dyndsl-095-033-089-091.ewe-ip-backbone.de) |
2022-10-09 13:25:08 +0200 | pretty_dumm_guy | (trottel@gateway/vpn/protonvpn/prettydummguy/x-88029655) |
2022-10-09 13:34:51 +0200 | lortabac | (~lortabac@2a01:e0a:541:b8f0:b9a1:d183:7268:d81) |
2022-10-09 13:35:34 +0200 | lortabac | (~lortabac@2a01:e0a:541:b8f0:b9a1:d183:7268:d81) (Client Quit) |
2022-10-09 13:36:54 +0200 | burnsidesLlama | (~burnsides@client-8-86.eduroam.oxuni.org.uk) |
2022-10-09 13:40:55 +0200 | odnes | (~odnes@5-203-193-32.pat.nym.cosmote.net) |
2022-10-09 13:40:56 +0200 | eL_Bart0 | (eL_Bart0@dietunichtguten.org) (Read error: Connection reset by peer) |
2022-10-09 13:45:24 +0200 | eL_Bart0 | (eL_Bart0@dietunichtguten.org) |
2022-10-09 13:45:33 +0200 | rosalind | lovebug |
2022-10-09 13:46:18 +0200 | odnes_ | (~odnes@5-203-193-32.pat.nym.cosmote.net) |
2022-10-09 13:46:20 +0200 | vysn | (~vysn@user/vysn) (Quit: WeeChat 3.5) |
2022-10-09 13:46:30 +0200 | odnes | (~odnes@5-203-193-32.pat.nym.cosmote.net) (Read error: Connection reset by peer) |
2022-10-09 13:48:18 +0200 | eL_Bart0 | (eL_Bart0@dietunichtguten.org) (Client Quit) |
2022-10-09 13:51:17 +0200 | eL_Bart0 | (eL_Bart0@dietunichtguten.org) |
2022-10-09 13:55:34 +0200 | <ski> | @type Control.Monad.ST.Unsafe.unsafeIOToST . Control.Monad.ST.Unsafe.unsafeSTToIO |
2022-10-09 13:55:35 +0200 | <lambdabot> | ST s1 a -> ST s2 a |
2022-10-09 14:03:51 +0200 | titibandit | (~titibandi@xdsl-89-0-65-2.nc.de) (Quit: Leaving.) |
2022-10-09 14:04:21 +0200 | bendo | (~bendo@fire-ara4.tngtech.com) (Ping timeout: 268 seconds) |
2022-10-09 14:04:44 +0200 | <freeside> | a ... "restatement"? |
2022-10-09 14:05:04 +0200 | lovebug | lys |
2022-10-09 14:05:06 +0200 | Franciman | (~Franciman@mx1.fracta.dev) (Read error: Connection reset by peer) |
2022-10-09 14:11:40 +0200 | acidjnk | (~acidjnk@p200300d6e7137a48695c1121120f860b.dip0.t-ipconnect.de) (Ping timeout: 268 seconds) |
2022-10-09 14:12:43 +0200 | tomboy64 | (~tomboy64@user/tomboy64) (Remote host closed the connection) |
2022-10-09 14:16:46 +0200 | mixphix | (~mixphix@bras-base-otwaon237cw-grc-11-174-91-129-69.dsl.bell.ca) |
2022-10-09 14:17:09 +0200 | odnes_ | (~odnes@5-203-193-32.pat.nym.cosmote.net) (Quit: Leaving) |
2022-10-09 14:17:59 +0200 | tomboy64 | (~tomboy64@user/tomboy64) |
2022-10-09 14:18:14 +0200 | <olivermead[m]> | <freeside> "a ... "restatement"?" <- love it |
2022-10-09 14:18:24 +0200 | Franciman | (~Franciman@mx1.fracta.dev) |
2022-10-09 14:20:22 +0200 | ec | (~ec@gateway/tor-sasl/ec) |
2022-10-09 14:21:25 +0200 | mixphix | (~mixphix@bras-base-otwaon237cw-grc-11-174-91-129-69.dsl.bell.ca) (Ping timeout: 265 seconds) |
2022-10-09 14:23:31 +0200 | eggplantade | (~Eggplanta@2600:1700:38c5:d800:50e1:7448:ac98:298f) |
2022-10-09 14:24:53 +0200 | Guest52 | (~Guest52@83-85-226-100.cable.dynamic.v4.ziggo.nl) |
2022-10-09 14:27:48 +0200 | ec | (~ec@gateway/tor-sasl/ec) (Ping timeout: 258 seconds) |
2022-10-09 14:27:57 +0200 | eggplantade | (~Eggplanta@2600:1700:38c5:d800:50e1:7448:ac98:298f) (Ping timeout: 250 seconds) |
2022-10-09 14:28:54 +0200 | cafce25 | (~cafce25@2001:a62:153a:a201:93a3:e4fa:f7e1:f6e2) |
2022-10-09 14:31:19 +0200 | ec | (~ec@gateway/tor-sasl/ec) |
2022-10-09 14:36:09 +0200 | adanwan | (~adanwan@gateway/tor-sasl/adanwan) (Remote host closed the connection) |
2022-10-09 14:37:46 +0200 | ec | (~ec@gateway/tor-sasl/ec) (Ping timeout: 258 seconds) |
2022-10-09 14:38:08 +0200 | adanwan | (~adanwan@gateway/tor-sasl/adanwan) |
2022-10-09 14:43:55 +0200 | jonathanx | (~jonathan@h-178-174-176-109.A357.priv.bahnhof.se) |
2022-10-09 14:45:04 +0200 | burnsidesLlama | (~burnsides@client-8-86.eduroam.oxuni.org.uk) (Remote host closed the connection) |
2022-10-09 14:45:11 +0200 | jonathanx__ | (~jonathan@h-178-174-176-109.A357.priv.bahnhof.se) (Ping timeout: 260 seconds) |
2022-10-09 14:54:30 +0200 | ski | states the obvious |
2022-10-09 15:02:28 +0200 | mixphix | (~mixphix@bras-base-otwaon237cw-grc-11-174-91-129-69.dsl.bell.ca) |
2022-10-09 15:03:12 +0200 | sagax | (~sagax_nb@user/sagax) |
2022-10-09 15:07:13 +0200 | mixphix | (~mixphix@bras-base-otwaon237cw-grc-11-174-91-129-69.dsl.bell.ca) (Ping timeout: 268 seconds) |
2022-10-09 15:10:16 +0200 | kdaishi | (~Thunderbi@94.191.137.35.mobile.tre.se) (Ping timeout: 260 seconds) |
2022-10-09 15:10:43 +0200 | perrierjouet | (~perrier-j@modemcable048.127-56-74.mc.videotron.ca) (Quit: WeeChat 3.6) |
2022-10-09 15:19:24 +0200 | <Guest52> | Hey, can someone give me some advice on this? https://paste.tomsmeding.com/4H0x5ECN. Im struggling to write an instance of Show for a polymorphic data type |
2022-10-09 15:19:40 +0200 | <Guest52> | What i currenty have implemented is a place holder |
2022-10-09 15:21:47 +0200 | <geekosaur> | that doesn't look polymorphic to me, just recursive |
2022-10-09 15:21:48 +0200 | ardell | (~ardell@user/ardell) (Quit: Leaving) |
2022-10-09 15:22:00 +0200 | bendo | (~bendo@fire-ara4.tngtech.com) |
2022-10-09 15:22:07 +0200 | burnsidesLlama | (~burnsides@client-8-86.eduroam.oxuni.org.uk) |
2022-10-09 15:22:17 +0200 | <hpc> | what's the issue? |
2022-10-09 15:22:17 +0200 | <Guest52> | My intuition is to write out a string reprensation of my data type (e.g. "Cons 20 (Cons 11...") that keeps concatenating to the result of the recursion |
2022-10-09 15:22:57 +0200 | <Guest52> | My issue is that I dont know how to get the string representation of the polymorphic value |
2022-10-09 15:23:30 +0200 | <hpc> | you know from how it's being used in that definition, that x :: a |
2022-10-09 15:23:39 +0200 | <hpc> | what other things do you know about the type 'a' in that context? |
2022-10-09 15:24:44 +0200 | <hpc> | when it just has type 'a' with no other context, the only thing you can do with x is (id x) |
2022-10-09 15:24:59 +0200 | <hpc> | but maybe there's something else available that can turn a value into a string for you already? |
2022-10-09 15:26:01 +0200 | <Guest52> | show ? |
2022-10-09 15:26:32 +0200 | <Guest52> | show :: a -> String |
2022-10-09 15:27:32 +0200 | <hpc> | :t show |
2022-10-09 15:27:33 +0200 | <lambdabot> | Show a => a -> String |
2022-10-09 15:27:46 +0200 | burnsidesLlama | (~burnsides@client-8-86.eduroam.oxuni.org.uk) (Ping timeout: 260 seconds) |
2022-10-09 15:28:02 +0200 | lys | rosalind |
2022-10-09 15:28:16 +0200 | <hpc> | it needs a (Show a) instance, but you've already said in your (Stream a) instance to require it |
2022-10-09 15:28:24 +0200 | <hpc> | so yep, you can just (show x) there |
2022-10-09 15:28:36 +0200 | <Guest52> | right so assuming type a has an instance of show, then it will work? But I dont think i can reference show in its own definition? |
2022-10-09 15:29:12 +0200 | adanwan | (~adanwan@gateway/tor-sasl/adanwan) (Remote host closed the connection) |
2022-10-09 15:29:29 +0200 | <geekosaur> | why not? |
2022-10-09 15:29:35 +0200 | <Guest52> | "but you've already said in your (Stream a) instance to require it" ahhh this makes sense.. i just copied that without really looking at it |
2022-10-09 15:29:59 +0200 | adanwan | (~adanwan@gateway/tor-sasl/adanwan) |
2022-10-09 15:30:12 +0200 | frost | (~frost@user/frost) (Ping timeout: 252 seconds) |
2022-10-09 15:30:12 +0200 | <Guest52> | because wont it try to call the show function that im currently defining? |
2022-10-09 15:30:29 +0200 | <hpc> | it'll call the show that's defined for that 'a' type |
2022-10-09 15:30:30 +0200 | <geekosaur> | (a) it's on a different type (b) even on the same type, as long as you have a base case for recursion to end on, it's fine |
2022-10-09 15:30:32 +0200 | <Guest52> | which will fail because it expects a (Stream a) |
2022-10-09 15:30:40 +0200 | <hpc> | > show 5 |
2022-10-09 15:30:41 +0200 | <lambdabot> | "5" |
2022-10-09 15:30:44 +0200 | <hpc> | > show (Just 5) |
2022-10-09 15:30:46 +0200 | <lambdabot> | "Just 5" |
2022-10-09 15:30:56 +0200 | <hpc> | @src Maybe |
2022-10-09 15:30:56 +0200 | <lambdabot> | data Maybe a = Nothing | Just a |
2022-10-09 15:31:38 +0200 | <geekosaur> | % :set -ddump-deriv |
2022-10-09 15:31:38 +0200 | <yahb2> | <interactive>:1:1: error: Not in scope: ‘Yahb2Defs.limitedPrint’ |
2022-10-09 15:31:46 +0200 | [itchyjunk] | (~itchyjunk@user/itchyjunk/x-7353470) |
2022-10-09 15:31:59 +0200 | <geekosaur> | % data MyMaybe a = MyNothing | MyJust a deriving Show |
2022-10-09 15:32:00 +0200 | <yahb2> | ==================== Derived instances ==================== ; Derived class instances: ; instance GHC.Show.Show a => GHC.Show.Show (Ghci1.MyMaybe a) where ; GHC.Show.showsPrec _ Ghci1.MyNothi... |
2022-10-09 15:32:01 +0200 | jonathanx | (~jonathan@h-178-174-176-109.A357.priv.bahnhof.se) (Remote host closed the connection) |
2022-10-09 15:32:06 +0200 | <geekosaur> | bah |
2022-10-09 15:32:14 +0200 | <hpc> | it's derived now anyway |
2022-10-09 15:32:16 +0200 | <geekosaur> | anyway try that in ghci |
2022-10-09 15:32:20 +0200 | jonathanx | (~jonathan@h-178-174-176-109.A357.priv.bahnhof.se) |
2022-10-09 15:32:38 +0200 | <geekosaur> | and you'll see that it uses Show on 'a' |
2022-10-09 15:33:05 +0200 | <geekosaur> | % :q |
2022-10-09 15:33:05 +0200 | <yahb2> | <no output> |
2022-10-09 15:36:06 +0200 | <Guest52> | ok thanks everyone |
2022-10-09 15:38:07 +0200 | mixphix | (~mixphix@bras-base-otwaon237cw-grc-11-174-91-129-69.dsl.bell.ca) |
2022-10-09 15:40:50 +0200 | raoul | (~raoul@95.179.203.88) (Quit: Ping timeout (120 seconds)) |
2022-10-09 15:41:03 +0200 | <ski> | Guest52 : fwiw, that's parametric, not polymorphic |
2022-10-09 15:41:16 +0200 | nonzen | (~nonzen@user/nonzen) (Quit: Gone) |
2022-10-09 15:41:30 +0200 | nonzen | (~nonzen@user/nonzen) |
2022-10-09 15:41:52 +0200 | energizer | (~energizer@user/energizer) (Quit: ZNC 1.7.0+deb0+xenial1 - https://znc.in) |
2022-10-09 15:42:04 +0200 | <ski> | Guest52 : any particular reason you don't keep the initial seed `x' in the stream, in `streamFromSeed' ? |
2022-10-09 15:42:12 +0200 | <ski> | Guest52 : also .. please don't use `Show' like that |
2022-10-09 15:42:15 +0200 | mixphix | (~mixphix@bras-base-otwaon237cw-grc-11-174-91-129-69.dsl.bell.ca) (Ping timeout: 252 seconds) |
2022-10-09 15:43:29 +0200 | raoul | (~raoul@95.179.203.88) |
2022-10-09 15:44:24 +0200 | <Guest52> | ski nope thats a bug... it should be Cons x... |
2022-10-09 15:44:28 +0200 | <ski> | Guest52 : at the very least, you should not be defining `show', but rather `showsPrec'. making use of `showParen',`showsPrec' in the body |
2022-10-09 15:44:37 +0200 | <ski> | Guest52, ah :) |
2022-10-09 15:44:49 +0200 | <ski> | (in that case, you don't need the `where') |
2022-10-09 15:45:39 +0200 | <ski> | btw, an alternative design is to use `(s -> (a,s)) -> (s -> Stream a)' (or maybe `(s -> a) -> (s -> s) -> (s -> Stream a)') |
2022-10-09 15:45:46 +0200 | <ski> | @type unfoldr |
2022-10-09 15:45:48 +0200 | <lambdabot> | (b -> Maybe (a, b)) -> b -> [a] |
2022-10-09 15:46:23 +0200 | <ski> | (that version basically does `streamFromSeed' and `streamMap', in one) |
2022-10-09 15:46:41 +0200 | <Guest52> | thanks! in regards to Show... your saying if your writing an instance of show; you shoud define showsPrec instead of shows ? |
2022-10-09 15:46:59 +0200 | <Guest52> | because its more specific ? |
2022-10-09 15:47:18 +0200 | <ski> | well, in most cases, people should be defining `showsPrec' rather than `show' |
2022-10-09 15:47:21 +0200 | energizer | (~energizer@user/energizer) |
2022-10-09 15:48:05 +0200 | <Guest52> | gotcha ... will stick with show for the sake of this hw assignment but noted for real business use cases |
2022-10-09 15:49:00 +0200 | <ski> | (a) `show' is inefficient, when you're composing your `Show' instance as part of another one, since you'll be appending to the `String'; and (b) `show' doesn't handle precedences, which you want to do, for composability with other `Show' instances |
2022-10-09 15:49:38 +0200 | Kaiepi | (~Kaiepi@142.68.249.28) (Quit: Leaving) |
2022-10-09 15:50:18 +0200 | <ski> | e.g. if i call `show' on `Just nats', it'll give a string starting with the characters `Just Cons 0' .. note the lack of a wrapping pair of brackets around the `Cons 0 ...' part |
2022-10-09 15:50:34 +0200 | <ski> | this is because you're not calling `showParen' as you're supposed to |
2022-10-09 15:51:00 +0200 | <olivermead[m]> | isn't general advice to always derive Show and Read rather than define since they need to be exact inverse operations? obviously correct me if I'm wrong |
2022-10-09 15:51:17 +0200 | <ski> | showsPrec p (Cons x xs) = showParen (p > 10) $ showString "Cons " . showsPrec 11 . showChar ' ' . showsPrec 11 xs |
2022-10-09 15:51:47 +0200 | <ski> | is how you'd fix the precedence stuff (while ignoring your desire to give a finite `String' in this case) |
2022-10-09 15:53:03 +0200 | <ski> | olivermead[m] : *usually*, yes. however, in some particular cases, it may be warranted to hand-write them. one important reason is that you're doing an Abstract Data Type, and you want to present your value in terms of your exported interface of operations, rather than in terms of internal representation format, which might change |
2022-10-09 15:53:48 +0200 | <olivermead[m]> | ski: awesome thank you |
2022-10-09 15:53:53 +0200 | <ski> | > listArray ((0,0),(2,3)) [m ^ n | (m,n) <- range ((0,0),(2,3))] |
2022-10-09 15:53:56 +0200 | <lambdabot> | array ((0,0),(2,3)) [((0,0),1),((0,1),0),((0,2),0),((0,3),0),((1,0),1),((1,1... |
2022-10-09 15:54:11 +0200 | <ski> | note that this responds in terms of `array', which is not a data constructor |
2022-10-09 15:54:23 +0200 | <ski> | `Data.Map' and `Data.Set' does the same kind of thing |
2022-10-09 15:55:10 +0200 | <ski> | olivermead[m] : another reason could be if one wanted to avoid redundant brackets, when doing infix data constructors .. unfortunately, the derived `Show' ignores fixity (while honoring precedence) |
2022-10-09 15:55:50 +0200 | <hpc> | > foldr (+) 0 [x, y, z] -- for example |
2022-10-09 15:55:52 +0200 | <lambdabot> | x + (y + (z + 0)) |
2022-10-09 15:55:54 +0200 | <hpc> | > foldl (+) 0 [x, y, z] -- for example |
2022-10-09 15:55:56 +0200 | <lambdabot> | 0 + x + y + z |
2022-10-09 15:56:33 +0200 | <olivermead[m]> | so in the listArray case above, is `read` the inverse operation still? |
2022-10-09 15:57:04 +0200 | <ski> | > (read . show) (listArray ((0,0),(2,3)) [m ^ n | (m,n) <- range ((0,0),(2,3))]) :: Array (Int,Int) Int |
2022-10-09 15:57:06 +0200 | <lambdabot> | array ((0,0),(2,3)) [((0,0),1),((0,1),0),((0,2),0),((0,3),0),((1,0),1),((1,1... |
2022-10-09 15:57:30 +0200 | FinnElija | (~finn_elij@user/finn-elija/x-0085643) (Ping timeout: 258 seconds) |
2022-10-09 15:57:31 +0200 | <olivermead[m]> | interesting, thank you |
2022-10-09 15:58:26 +0200 | <ski> | (it wouldn't be too hard to have the derived `Show' honor fixity as well, afaiui .. it just doesn't, for whatever reason) |
2022-10-09 16:00:37 +0200 | FinnElija | (~finn_elij@user/finn-elija/x-0085643) |
2022-10-09 16:00:53 +0200 | <ski> | Guest52 : in your case, presumably you'd want to elide some tail of the stream (perhaps replacing it by `...'), while still keeping brackets matched (which a naïve `(++) . take 20 . ($ "")' thrown into the composition won't do, even ignoring tokens being cut in half). you could do this, if you define a separate function which keeps track of the depth in a parameter |
2022-10-09 16:03:01 +0200 | <ski> | Guest52 : however, because the result (cut off, possibly with `...') would be an invalid `String' representation of a Haskell value (syntax error if you paste it into the interactor, or a source file), i'd prefer to not adding this cut-off functionality into `Show' at all. you could define a separate `pp' (pretty-print) function which does what you want. or you could simply define a `takeStream :: Int -> |
2022-10-09 16:03:07 +0200 | <ski> | Stream a -> [a]' .. |
2022-10-09 16:03:49 +0200 | <geekosaur> | there might be other reasons to avoid it, though |
2022-10-09 16:03:53 +0200 | Topsi | (~Topsi@dyndsl-095-033-089-091.ewe-ip-backbone.de) (Ping timeout: 252 seconds) |
2022-10-09 16:04:02 +0200 | <geekosaur> | such as preference not to force the head of a Stream |
2022-10-09 16:05:04 +0200 | <ski> | hm ? |
2022-10-09 16:05:23 +0200 | <geekosaur> | I'm thinking large or complicated expressions for `a` |
2022-10-09 16:05:41 +0200 | <ski> | not force the head, where ? in `showsPrec' ? |
2022-10-09 16:06:03 +0200 | <geekosaur> | if you intend to process them one at a time, `show`ing more than one element is probably not wise |
2022-10-09 16:06:48 +0200 | <ski> | well, `Show' here is probably just for debugging/testing anyway, no ? |
2022-10-09 16:07:01 +0200 | <geekosaur> | yes, one would hope |
2022-10-09 16:07:14 +0200 | cafce25 | (~cafce25@2001:a62:153a:a201:93a3:e4fa:f7e1:f6e2) (Ping timeout: 252 seconds) |
2022-10-09 16:09:46 +0200 | <ski> | question : is `unfoldStream' in some sense a "normal form" for `Stream's ? |
2022-10-09 16:11:49 +0200 | <ski> | we have e.g. |
2022-10-09 16:11:59 +0200 | <ski> | streamMap f (unfoldStream g s) = unfoldStream (first f . g) s |
2022-10-09 16:12:05 +0200 | <ski> | alt. |
2022-10-09 16:12:27 +0200 | <ski> | streamMap f (unfoldStream' g h s) = unfoldStream' (f . g) h s |
2022-10-09 16:13:29 +0200 | perrierjouet | (~perrier-j@modemcable048.127-56-74.mc.videotron.ca) |
2022-10-09 16:13:44 +0200 | nate1 | (~nate@98.45.169.16) |
2022-10-09 16:14:27 +0200 | ski | . o O ( `data Stream :: * -> * where UnfoldStream :: (s -> (a,s)) -> s -> Stream a' ) |
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2022-10-09 20:25:40 +0200 | jakalx | (~jakalx@base.jakalx.net) () |
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2022-10-09 20:54:30 +0200 | titibandit | (~titibandi@xdsl-89-0-65-2.nc.de) |
2022-10-09 20:57:24 +0200 | burnsidesLlama | (~burnsides@client-8-77.eduroam.oxuni.org.uk) |
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2022-10-09 21:05:31 +0200 | <janus> | i never actually used the Writer/WriterT monad |
2022-10-09 21:05:50 +0200 | <janus> | but now i have a writer effect that is backed by IO |
2022-10-09 21:06:16 +0200 | <EvanR> | like, IO () monoid |
2022-10-09 21:06:26 +0200 | <EvanR> | (>>) |
2022-10-09 21:06:59 +0200 | <janus> | the write method is queueing a write operation on a uring queue |
2022-10-09 21:07:15 +0200 | <janus> | my issue is that the Writer monad seems to have all sorts of methods i don't really need |
2022-10-09 21:07:48 +0200 | <EvanR> | it's also lazy as hell |
2022-10-09 21:08:07 +0200 | <janus> | i thought it would just be 'tell' |
2022-10-09 21:08:35 +0200 | <janus> | so what do people usally do when abstracting out IO? do you just make a custom type class for this? |
2022-10-09 21:09:08 +0200 | <EvanR> | if you actually want to have a method that just does this queueing IO, you can pass the action in with ReaderT and execute it with IO |
2022-10-09 21:09:38 +0200 | <janus> | right, ok |
2022-10-09 21:09:38 +0200 | burnsidesLlama | (~burnsides@client-8-77.eduroam.oxuni.org.uk) |
2022-10-09 21:09:53 +0200 | gmg | (~user@user/gehmehgeh) |
2022-10-09 21:10:00 +0200 | <EvanR> | or if you have a bunch of custom actions to be backed by some monad, pass in a record of actions, the record is parameterized by m |
2022-10-09 21:10:12 +0200 | <EvanR> | accessed by ReaderT |
2022-10-09 21:10:31 +0200 | <janus> | but that sounds like a typeclass, except you dispatch the dictionary manually |
2022-10-09 21:10:37 +0200 | <janus> | but i guess there is nothing wrong with that |
2022-10-09 21:11:45 +0200 | <EvanR> | there's a fundamental difference between using record of implementation and type classes, and I probably can't formulate that difference properly xD |
2022-10-09 21:12:07 +0200 | <EvanR> | kmett video Typeclasses vs The World |
2022-10-09 21:13:22 +0200 | burnsidesLlama | (~burnsides@client-8-77.eduroam.oxuni.org.uk) (Remote host closed the connection) |
2022-10-09 21:14:01 +0200 | <EvanR> | circling back to Writer and WriterT, you should do a deep dive on the laziness characteristics when you get a chance between it might surprise you for the context you were trying to use it in |
2022-10-09 21:14:11 +0200 | <EvanR> | s/between/because/ |
2022-10-09 21:15:15 +0200 | pavonia | (~user@user/siracusa) |
2022-10-09 21:16:46 +0200 | <janus> | it shouldn't matter because the pure implementation would only be used for small tests |
2022-10-09 21:17:11 +0200 | wroathe | (~wroathe@user/wroathe) (Ping timeout: 260 seconds) |
2022-10-09 21:17:21 +0200 | <EvanR> | there's a non pure implementation of Writer? |
2022-10-09 21:17:49 +0200 | <janus> | i am not using Writer yet, because i currently only have the IO backed write operation |
2022-10-09 21:18:16 +0200 | <janus> | so i have no abstraction yet, i am trying to invent the abstraction that would fit :P |
2022-10-09 21:18:26 +0200 | <janus> | or rather, discover the prior art |
2022-10-09 21:19:23 +0200 | justsomeguy | (~justsomeg@user/justsomeguy) |
2022-10-09 21:20:48 +0200 | mvk | (~mvk@2607:fea8:5ce3:8500::a80f) (Ping timeout: 264 seconds) |
2022-10-09 21:21:39 +0200 | <EvanR> | abstracting out your IO seems to be complicated by the fact that all these libraries come with existing answers to that, not always the same answer xD |
2022-10-09 21:25:01 +0200 | mixphix | (~mixphix@bras-base-otwaon237cw-grc-11-174-91-129-69.dsl.bell.ca) |
2022-10-09 21:28:01 +0200 | natechan | (~nate@98.45.169.16) |
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2022-10-09 22:06:45 +0200 | <dminuoso> | Control.Monad.Trans.Writer.CPS is a thing,m though. |
2022-10-09 22:07:13 +0200 | <dminuoso> | But I find IORef/STRef to be better tools for a lot of applications. |
2022-10-09 22:07:32 +0200 | jakalx | (~jakalx@base.jakalx.net) (Error from remote client) |
2022-10-09 22:07:49 +0200 | LukeHoersten | (~LukeHoers@user/lukehoersten) |
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2022-10-09 22:11:58 +0200 | stiell_ | (~stiell@gateway/tor-sasl/stiell) |
2022-10-09 22:12:11 +0200 | natechan | (~nate@98.45.169.16) (Ping timeout: 265 seconds) |
2022-10-09 22:12:25 +0200 | <EvanR> | I equip my Control.Monad.Trans.Writer.CPS with an IORef/STRef so I can log during my algorithm. By cons onto a long list then reversing at the end xD |
2022-10-09 22:12:46 +0200 | jakalx | (~jakalx@base.jakalx.net) |
2022-10-09 22:12:55 +0200 | <EvanR> | HASK LIFE |
2022-10-09 22:13:01 +0200 | <dminuoso> | How do you do that? |
2022-10-09 22:13:19 +0200 | <dminuoso> | Oh hold on, you assume an IO inside |
2022-10-09 22:13:49 +0200 | <dminuoso> | Honestly I just use ReaderT, because that frees me from MonadBaseControl and gives me MonadUnliftIO. |
2022-10-09 22:14:08 +0200 | <dminuoso> | All that Writer can give you, you can do with that too but its less restricting. |
2022-10-09 22:14:59 +0200 | burnsidesLlama | (~burnsides@client-8-86.eduroam.oxuni.org.uk) |
2022-10-09 22:18:08 +0200 | LukeHoersten | (~LukeHoers@user/lukehoersten) (Quit: My MacBook has gone to sleep. ZZZzzz…) |
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2022-10-09 22:39:54 +0200 | Luj34 | Luj3 |
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2022-10-09 22:54:16 +0200 | <raehik1> | I have `data A = A Void`. Why isn't `consumeA :: A -> ()`, `consumeA a = case a of {}` exhaustive? |
2022-10-09 22:54:33 +0200 | biberu | (~biberu@user/biberu) |
2022-10-09 22:55:06 +0200 | <raehik1> | I swear there was a paper on an AST design pattern that did relied on this sort of pattern. Perhaps they just ignored all the falsy non-exhausitivity compiler messages |
2022-10-09 22:55:46 +0200 | <EvanR> | that's not all the cases |
2022-10-09 22:56:00 +0200 | <EvanR> | try instead data A = A !Void |
2022-10-09 22:56:08 +0200 | <dminuoso> | newtype? |
2022-10-09 22:56:10 +0200 | <EvanR> | or newtype |
2022-10-09 22:56:33 +0200 | <dminuoso> | But yeah, there's two ways to construct something of type A here. |
2022-10-09 22:56:39 +0200 | <dminuoso> | `A undefined` and `undefined` |
2022-10-09 22:56:48 +0200 | TonyStone | (~TonyStone@cpe-74-76-51-197.nycap.res.rr.com) (Quit: Leaving) |
2022-10-09 22:56:54 +0200 | <EvanR> | e.g. as it stands consumeA (A undefined) could return () if you fixed the code |
2022-10-09 22:57:34 +0200 | <dminuoso> | My memory is a bit hazy, but making the field strict is still not the same though., |
2022-10-09 22:57:35 +0200 | <raehik1> | dminuoso: ohhh, yeah. So if type A was a sum type, is this possible to make work? Could I ignore constructors that have a Void in them? |
2022-10-09 22:57:49 +0200 | <dminuoso> | raehik1: You can just do a nested case-of as well. |
2022-10-09 22:58:00 +0200 | <dminuoso> | case a of A i -> case i of {} |
2022-10-09 22:58:34 +0200 | <raehik1> | EvanR: oh! this works! |
2022-10-09 22:58:55 +0200 | <EvanR> | yes... there might still be a loophole involving A !Void |
2022-10-09 22:58:58 +0200 | mixphix | (~mixphix@bras-base-otwaon237cw-grc-11-174-91-129-69.dsl.bell.ca) |
2022-10-09 22:59:01 +0200 | yvan-sraka | (~yvan-srak@2a02:2788:224:71c:21e9:cca6:df3c:a2) (Remote host closed the connection) |
2022-10-09 22:59:12 +0200 | <dminuoso> | There's a bunch of semantic differences |
2022-10-09 22:59:18 +0200 | <raehik1> | And my GHC 9.2 is happy with A !Void too |
2022-10-09 22:59:21 +0200 | <EvanR> | call the haskell librarian |
2022-10-09 22:59:38 +0200 | <raehik1> | *oops, I mean with the nested case too |
2022-10-09 22:59:51 +0200 | <dminuoso> | Bah I cannot recall whoever recommended flatparse to me, but that thing is my favourite parser library fo the year. |
2022-10-09 22:59:54 +0200 | <raehik1> | I was thinking of the trees that grow paper |
2022-10-09 23:00:04 +0200 | <raehik1> | dminuoso: that was me the other day :)) |
2022-10-09 23:00:39 +0200 | <dminuoso> | Ive started writing a flatpack library that similarly constructs fixed bytestrings. |
2022-10-09 23:00:56 +0200 | <dminuoso> | mason is just too big and doesnt have a few features I want (like resetting position) |
2022-10-09 23:01:20 +0200 | __monty__ | (~toonn@user/toonn) (Quit: leaving) |
2022-10-09 23:01:54 +0200 | rockystone | (~rocky@user/rockymarine) |
2022-10-09 23:03:54 +0200 | mixphix | (~mixphix@bras-base-otwaon237cw-grc-11-174-91-129-69.dsl.bell.ca) (Ping timeout: 268 seconds) |
2022-10-09 23:04:00 +0200 | <EvanR> | Stackpak - Flatpak a Haskell Stack App into Flathub |
2022-10-09 23:06:16 +0200 | rockystone | (~rocky@user/rockymarine) (Ping timeout: 260 seconds) |
2022-10-09 23:08:36 +0200 | machinedgod | (~machinedg@d198-53-218-113.abhsia.telus.net) |
2022-10-09 23:09:44 +0200 | eggplantade | (~Eggplanta@104-55-37-220.lightspeed.sntcca.sbcglobal.net) |
2022-10-09 23:11:09 +0200 | wroathe | (~wroathe@user/wroathe) (Ping timeout: 265 seconds) |
2022-10-09 23:11:51 +0200 | ChaiTRex | (~ChaiTRex@user/chaitrex) (Quit: ChaiTRex) |
2022-10-09 23:13:43 +0200 | lambdap237 | (~lambdap@static.167.190.119.168.clients.your-server.de) |
2022-10-09 23:14:19 +0200 | ChaiTRex | (~ChaiTRex@user/chaitrex) |
2022-10-09 23:14:26 +0200 | eggplantade | (~Eggplanta@104-55-37-220.lightspeed.sntcca.sbcglobal.net) (Ping timeout: 268 seconds) |
2022-10-09 23:14:55 +0200 | lambdap237 | (~lambdap@static.167.190.119.168.clients.your-server.de) (Client Quit) |
2022-10-09 23:15:49 +0200 | lambdap237 | (~lambdap@static.167.190.119.168.clients.your-server.de) |
2022-10-09 23:16:05 +0200 | perrierjouet | (~perrier-j@modemcable048.127-56-74.mc.videotron.ca) |
2022-10-09 23:18:01 +0200 | ec | (~ec@gateway/tor-sasl/ec) |
2022-10-09 23:19:09 +0200 | son0p | (~ff@181.136.122.143) |
2022-10-09 23:22:56 +0200 | ec | (~ec@gateway/tor-sasl/ec) (Ping timeout: 258 seconds) |
2022-10-09 23:27:04 +0200 | gmg | (~user@user/gehmehgeh) (Quit: Leaving) |
2022-10-09 23:28:44 +0200 | mixphix | (~mixphix@bras-base-otwaon237cw-grc-11-174-91-129-69.dsl.bell.ca) |
2022-10-09 23:29:33 +0200 | michalz | (~michalz@185.246.207.215) (Remote host closed the connection) |
2022-10-09 23:34:07 +0200 | mixphix | (~mixphix@bras-base-otwaon237cw-grc-11-174-91-129-69.dsl.bell.ca) (Ping timeout: 268 seconds) |
2022-10-09 23:35:57 +0200 | rockystone | (~rocky@user/rockymarine) |
2022-10-09 23:36:52 +0200 | takuan | (~takuan@178-116-218-225.access.telenet.be) (Remote host closed the connection) |
2022-10-09 23:39:17 +0200 | wroathe | (~wroathe@50.205.197.50) |
2022-10-09 23:39:17 +0200 | wroathe | (~wroathe@50.205.197.50) (Changing host) |
2022-10-09 23:39:17 +0200 | wroathe | (~wroathe@user/wroathe) |
2022-10-09 23:40:01 +0200 | acidjnk | (~acidjnk@p54ad5adb.dip0.t-ipconnect.de) (Ping timeout: 252 seconds) |
2022-10-09 23:40:36 +0200 | coot | (~coot@2a02:a310:e241:1b00:ec1a:e9df:79ac:66ba) |
2022-10-09 23:40:45 +0200 | rockystone | (~rocky@user/rockymarine) (Ping timeout: 252 seconds) |
2022-10-09 23:42:38 +0200 | coot | (~coot@2a02:a310:e241:1b00:ec1a:e9df:79ac:66ba) (Client Quit) |
2022-10-09 23:45:07 +0200 | <jackdk> | Axman6: this flatparse lib looks very up your alley |
2022-10-09 23:49:14 +0200 | ec | (~ec@gateway/tor-sasl/ec) |
2022-10-09 23:55:05 +0200 | burnsidesLlama | (~burnsides@client-8-86.eduroam.oxuni.org.uk) (Remote host closed the connection) |