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Logs: liberachat/#haskell

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2021-07-13 08:24:23 → eggplantade joins (~Eggplanta@108-201-191-115.lightspeed.sntcca.sbcglobal.net)
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2021-07-13 09:25:23 <junkicide> I have the function length . lines <$> readFile "countLines.hs" but it gives an error when I try to fmap it over a list of filenames and I can't understand why
2021-07-13 09:25:46 <Rembane> junkicide: What's the error and what's your code?
2021-07-13 09:26:15 × azeem quits (~azeem@176.201.21.158) (Ping timeout: 255 seconds)
2021-07-13 09:26:30 <junkicide> countLines :: String -> String -> IO ()
2021-07-13 09:26:30 <junkicide> countLines str ext = do files <- getDirectoryContents str
2021-07-13 09:26:30 <junkicide> let filtered = [do y <- readFile x | x <- files, ext == takeWhile (/='.') (reverse x)]
2021-07-13 09:26:30 <junkicide> putStrLn $ show $ zip files $ fmap ( length . lines) filtered
2021-07-13 09:27:20 <junkicide> hang on, this isn't the right one
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2021-07-13 09:29:22 <Rembane> junkicide: Put it in a pastebin instead, like for instance: https://paste.tomsmeding.com/
2021-07-13 09:30:22 <junkicide> ok that's useful, thanks
2021-07-13 09:31:05 <Rembane> No worries. :)
2021-07-13 09:31:46 × shutdown_-h_now quits (~arjan@82-75-187-100.cable.dynamic.v4.ziggo.nl) (Ping timeout: 265 seconds)
2021-07-13 09:33:35 × pavonia quits (~user@user/siracusa) (Quit: Bye!)
2021-07-13 09:33:54 <junkicide> here it is
2021-07-13 09:33:55 <junkicide> https://paste.tomsmeding.com/vaSgxQD6
2021-07-13 09:34:01 <smtnet3> seems to work on my end
2021-07-13 09:34:03 → agua joins (~agua@2804:18:49:ccb3:1:0:1397:e350)
2021-07-13 09:34:35 <smtnet3> (length . lines) <$> readFile "Chapter6.hs"
2021-07-13 09:35:11 <junkicide> yeah the problem comes when I try to fmap it over a list of filenames
2021-07-13 09:36:12 <Rembane> junkicide: You need to use one fmap to do things on IO, and then another fmap to do things on the contents of list.
2021-07-13 09:36:22 <smtnet3> try fmap . fmap
2021-07-13 09:36:32 × hyiltiz quits (~quassel@31.220.5.250) (Ping timeout: 268 seconds)
2021-07-13 09:36:53 <smtnet3> :t (fmap . fmap)
2021-07-13 09:36:54 <lambdabot> (Functor f1, Functor f2) => (a -> b) -> f1 (f2 a) -> f1 (f2 b)
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2021-07-13 09:38:10 <junkicide> oh, fmap . fmap doesn't seem to work right away but I see where the problem is
2021-07-13 09:38:22 <junkicide> thanks smtnet3 and Rembane
2021-07-13 09:38:58 <smtnet3> junkicide, n/w
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2021-07-13 09:44:24 × agua quits (~agua@2804:18:49:ccb3:1:0:1397:e350) (Read error: Connection reset by peer)
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2021-07-13 09:50:02 <haskell-anon> how do you make lsp's "jump to definition" work with dependencies
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2021-07-13 09:52:53 → lep- joins (~lep@94.31.97.183)
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2021-07-13 09:56:22 <smtnet3> w/ emacs, haskell-anon
2021-07-13 09:56:24 <smtnet3> *?
2021-07-13 09:56:35 <haskell-anon> yes, with emacs
2021-07-13 09:56:52 <Rembane> junkicide: np!
2021-07-13 09:57:05 × qbt quits (~edun@user/edun) (Quit: WeeChat 3.2)
2021-07-13 09:57:42 <smtnet3> unrelated but why is this the case with multiple shadowing bindings... let seems to take precedence over where https://pastebin.com/XBgTHEvw
2021-07-13 09:57:44 × lep- quits (~lep@94.31.97.183) (Ping timeout: 272 seconds)
2021-07-13 09:58:20 <smtnet3> haskell-anon, there's an lsp discord if you don't find your answer here
2021-07-13 09:58:47 <haskell-anon> ok
2021-07-13 09:58:47 <smtnet3> lsp is a pain to setup if you don't know the whole shebang of it all
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2021-07-13 09:59:49 <tomsmeding> smtnet3: the where-block is attached to the whole function right-hand side here
2021-07-13 10:00:24 <tomsmeding> haskell-anon: there is also #haskell-language-server on this irc network :)
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