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Logs: liberachat/#haskell

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2021-08-06 17:05:36 <maerwald[m]> There's also https://gitlab.haskell.org/haskell/ghcup-hs#with_ghc-wrapper-eg-for-hls
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2021-08-06 17:09:01 <dsal> Guest6153: emacs has two paths you can set. There's the `PATH` environment that's passed down to subprocesses and the `exec-path` list that it uses to find things.
2021-08-06 17:09:20 <dsal> Argh, hit the wrong guest.
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2021-08-06 17:10:37 <monochrom> Yeah the right guest left. Confounding even smart autocompletion.
2021-08-06 17:11:16 <maerwald[m]> the Right guest Left... english is weird
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2021-08-06 17:12:24 <dsal> Is there `swap` for Either?
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2021-08-06 17:13:02 <dsal> I wrote some type that's basically `Either a a`. No idea where I put that or what I called it....
2021-08-06 17:13:12 <monochrom> I haven't seen one in libraries, but I would be inclined to name it "ingsoc".
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2021-08-06 17:29:50 <delYsid> @hoogle (Monoid (f a), Applicative f) => Maybe a -> f a
2021-08-06 17:29:51 <lambdabot> Generic.Data.Internal.Utils coerce' :: Coercible (f x) (g x) => f x -> g x
2021-08-06 17:29:51 <lambdabot> Control.Effect.Lift sendM :: (Has (Lift n) sig m, Functor n) => n a -> m a
2021-08-06 17:29:51 <lambdabot> Blanks.ScopeW scopeWLiftAnno :: (NatNewtype (ScopeW t n f g) g, Functor t) => t a -> g a
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2021-08-06 18:15:30 <lechner> Hi, why does connectPostgreSQL in postgresql-simple expect a strict ByteString instead of lazy, please (or provide an implementation for the latter)? Thanks!
2021-08-06 18:17:07 <monochrom> You can use "toStrict" easily?
2021-08-06 18:18:06 <monochrom> I am not the author, but if I were, I wouldn't expect a query to be more than even 1MB long such that lazy bytestring would be called for.
2021-08-06 18:18:11 × epolanski quits (uid312403@id-312403.brockwell.irccloud.com) (Quit: Connection closed for inactivity)
2021-08-06 18:18:40 <lechner> I do, but I thought Haskell is lazy by default. I also do not understand why a separate type is needed to ensure evalution.
2021-08-06 18:19:33 <monochrom> But postgresql is eager by default.
2021-08-06 18:19:48 <monochrom> Especially when it wants you to submit a query.
2021-08-06 18:19:54 <lechner> it's the connection string
2021-08-06 18:20:05 <monochrom> That too.
2021-08-06 18:21:08 <lechner> i understand that some routines, like a socket 'receive', deliver a fully evaluated string, but why does that require a separate type?
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2021-08-06 18:33:24 <monochrom> Given that both kinds of bytestrings are available, I would agree with the author in choosing the non-lazy one to make clear the semantics of the API.
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2021-08-06 18:34:01 <monochrom> So you would have to escalate it to the level of: why would the bytestring library give you a choice, why didn't it be a dictator.
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2021-08-06 18:34:19 <monochrom> But I guess once framed that way the answer is pretty clear.
2021-08-06 18:34:41 <monochrom> We do recognize that laziness is bad for some use cases and there should always be a choice.
2021-08-06 18:35:20 <lechner> i guess it was too slow or inefficient to have only lazy ByteStrings and "evaluate $ force" at the relevant IO points
2021-08-06 18:39:17 <lechner> My issue with the ByteString paradigm is, I suppose, that I like to convert UTF-8 to code points at the earliest possibility for input (and the latest for output). Those intermediate Strings are lazy, so in addition to UTF-8 I have to deal with lazy and strict more often
2021-08-06 18:41:19 <lechner> For Haskell those two often seem to come together; either I have a (lazy) String or a strict BysteString, which nowadays is usually in UTF-8
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2021-08-06 18:46:23 <lechner> which means I can make my life easier by using the strict version of UTF8.fromString. sorry about thinking aloud
2021-08-06 18:47:12 <Gurkenglas> When a compilation error is confusing, could I run a debugger on GHC to get more info on how the error arose?
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2021-08-06 18:48:28 <Gurkenglas> Also, is there a graphical debugger for Haskell? I notice that they are much more pleasant to work with than command-line debuggers.
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