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2020-10-15 14:58:05 → Kaiepi joins (~Kaiepi@nwcsnbsc03w-47-55-225-82.dhcp-dynamic.fibreop.nb.bellaliant.net)
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2020-10-15 15:00:01 × doomas quits (~doomas@94.229.74.91) ()
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2020-10-15 15:04:31 <dminuoso> lens/optics question: I have some [(10,Just "abc"), (20, Just "cde"), (30, Nothing)] -- is there a way to take some `each . _Just . each` and combine it with the Int in the tuple as its "Ix"?
2020-10-15 15:05:17 <phadej> what you mean by combine
2020-10-15 15:05:39 × xff0x quits (~fox@217.110.198.158) (Ping timeout: 260 seconds)
2020-10-15 15:05:51 <dminuoso> So I want to fold over each character, while having access to the number.
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2020-10-15 15:05:53 <dminuoso> Sort of like
2020-10-15 15:06:05 <dminuoso> Fold [(Int, Maybe String)] (Int, Char)
2020-10-15 15:06:07 <phadej> :t <.
2020-10-15 15:06:09 <lambdabot> error: parse error on input ‘<.’
2020-10-15 15:06:13 <phadej> :t (<.)
2020-10-15 15:06:16 <lambdabot> Indexable i p => (Indexed i s t -> r) -> ((a -> b) -> s -> t) -> p a b -> r
2020-10-15 15:06:22 <phadej> lookup it on lens docs
2020-10-15 15:06:43 <dminuoso> phadej: That's spot on! Thanks. :)
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2020-10-15 15:07:20 → xff0x joins (~fox@217.110.198.158)
2020-10-15 15:09:30 → ixlun joins (~matthew@213.205.241.94)
2020-10-15 15:10:18 × kenran quits (~maier@b2b-37-24-119-190.unitymedia.biz) (Ping timeout: 256 seconds)
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2020-10-15 15:12:30 <ixlun> Ugh, got disconnected... did my previous question get through?
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2020-10-15 15:14:05 <monochrom> I think no.
2020-10-15 15:14:07 <tomsmeding> ixlun: https://ircbrowse.tomsmeding.com/browse/haskell?events_page=656
2020-10-15 15:14:55 → dansho joins (~dansho@ip68-108-167-185.lv.lv.cox.net)
2020-10-15 15:15:51 <ixlun> Ah, I shall ask again in that case: I was just wondering if anyone knew if there was a way to kill a haskell thread off that was in the middle of a long pure computation?
2020-10-15 15:16:03 <merijn> ixlun: Did you create the thread?
2020-10-15 15:16:09 <ixlun> Yes
2020-10-15 15:16:14 <ixlun> I've tried killThread
2020-10-15 15:16:23 <merijn> That doesn't work?
2020-10-15 15:16:43 <ixlun> It does but after a significant delay
2020-10-15 15:16:48 → bitmagie joins (~Thunderbi@200116b806495000583b859276a8aad8.dip.versatel-1u1.de)
2020-10-15 15:17:13 <ixlun> (although what is strange is that the whole program terminates with SIGKILL)
2020-10-15 15:17:18 <merijn> I dunno when async exceptions are checked/handled. Naively I'd guess like pre-emption at GC time
2020-10-15 15:17:43 <ixlun> I was wondering if they could only
2020-10-15 15:17:59 <ixlun> only be handled in between IO actions
2020-10-15 15:18:12 <merijn> So if you have a tight pure loop that doesn't allocate much, that could take some time
2020-10-15 15:18:18 × nineonine quits (~nineonine@216-19-190-182.dyn.novuscom.net) (Ping timeout: 256 seconds)
2020-10-15 15:18:21 <ixlun> My only other thought was to pepper my pure computation with `yield' but I don't really like that solution
2020-10-15 15:18:31 <monochrom> No other way. Short story: Think of cooperative multitasking but automatic insertion of yield points at heap allocation points.
2020-10-15 15:18:36 <merijn> ixlun: Oh, wait
2020-10-15 15:18:42 <merijn> ixlun: Is this the single-threaded runtime?
2020-10-15 15:18:45 <ixlun> Yes
2020-10-15 15:18:52 <merijn> Try the multithreaded one
2020-10-15 15:18:54 × knupfer1 quits (~Thunderbi@mue-88-130-61-082.dsl.tropolys.de) (Quit: knupfer1)
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2020-10-15 15:19:06 <Ariakenom> async exceptions are checked when allocating
2020-10-15 15:19:13 → heatsink joins (~heatsink@107-136-5-69.lightspeed.sntcca.sbcglobal.net)
2020-10-15 15:19:15 <ixlun> How do I do that, use forkOS rather than forkIO?
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2020-10-15 15:19:17 <merijn> Sounds like the 1 thread is taking a long time to yield, so the killThread just doesn't get thrown until way later :p
2020-10-15 15:19:24 <merijn> ixlun: No, it's a compiletime flag
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2020-10-15 15:19:30 <monochrom> No, use "ghc ... -threaded ..."
2020-10-15 15:19:32 <merijn> ixlun: Use "ghc -threaded"
2020-10-15 15:19:41 × knupfer quits (~Thunderbi@200116b82c60f7009c37b4c844721161.dip.versatel-1u1.de) (Client Quit)
2020-10-15 15:19:45 <merijn> (and run with "+RTS -N2")
2020-10-15 15:19:51 <monochrom> forkOS is an orthogonal concern.
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2020-10-15 15:19:59 × knupfer quits (~Thunderbi@200116b82c60f7003045c598d524f05b.dip.versatel-1u1.de) (Client Quit)
2020-10-15 15:20:08 → knupfer joins (~Thunderbi@200116b82c60f7003045c598d524f05b.dip.versatel-1u1.de)
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2020-10-15 15:20:19 <merijn> ixlun: The default runtime only runs one OS thread of Haskell code, regardless of how many forkIO threads you have
2020-10-15 15:20:23 → knupfer joins (~Thunderbi@200116b82c60f700c426196ed47f12f7.dip.versatel-1u1.de)
2020-10-15 15:20:40 <merijn> ixlun: -threaded lets you use multiple OS threads in parallel to run forkIO threads simultaneously
2020-10-15 15:20:59 <merijn> (if you use "+RTS -N2" to actually run it with 2 OS threads, that is)
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2020-10-15 15:21:00 <Ariakenom> with -fno-omit-yields the checks are more often. every function call perhaps
2020-10-15 15:21:03 <Ariakenom> https://downloads.haskell.org/~ghc/latest/docs/html/users_guide/using-optimisation.html#ghc-flag--fomit-yields
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2020-10-15 15:24:20 <hyperisco> I need to take template files, instantiate variables, and evaluate… any template language with conditionals will do. Suggestions?
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2020-10-15 15:25:15 <ixlun> Hmm, both of those solutions didn't seem to work unfortunetly :-(
2020-10-15 15:25:51 <hyperisco> https://hackage.haskell.org/package/doctemplates looks promising
2020-10-15 15:26:01 <tomsmeding> hyperisco: mustache has is-not-null conditionals
2020-10-15 15:26:30 <hyperisco> am looking for equality at least on integers
2020-10-15 15:26:34 × bitmagie quits (~Thunderbi@200116b806495000583b859276a8aad8.dip.versatel-1u1.de) (Quit: bitmagie)
2020-10-15 15:26:51 <hyperisco> well I guess I can do is-not-null and just set variables carefully :P
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