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2020-11-12 01:32:01 × wwwww quits (~wwwww@unaffiliated/wwwww) (Ping timeout: 246 seconds)
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2020-11-12 01:57:52 <bqv> Translating imperative code to funct
2020-11-12 01:57:59 <bqv> onal is a pain
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2020-11-12 01:58:17 dbmikus__ joins (~dbmikus@cpe-76-167-86-219.natsow.res.rr.com)
2020-11-12 01:58:36 <bqv> requires full redesign, not just porting
2020-11-12 01:59:03 × wwwww quits (~wwwww@unaffiliated/wwwww) (Ping timeout: 260 seconds)
2020-11-12 02:00:41 <sm[m]> it's often said that you can replicate imperative code in haskell. It's true, but not often done. If the techniques were better known it might be used a bit more
2020-11-12 02:01:01 wwwww joins (~wwwww@unaffiliated/wwwww)
2020-11-12 02:01:56 <bqv> I mean you can, it's just not ergonomic to write or efficient to run
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2020-11-12 02:02:52 × dbmikus__ quits (~dbmikus@cpe-76-167-86-219.natsow.res.rr.com) (Ping timeout: 258 seconds)
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2020-11-12 02:17:13 × lucasb quits (uid333435@gateway/web/irccloud.com/x-pbogwxffcquqlbnb) (Quit: Connection closed for inactivity)
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2020-11-12 02:17:57 <koz_> bqv: I dunno why you claim the latter. ST is pretty efficient IIRC.
2020-11-12 02:18:09 × angerman quits (sid209936@gateway/web/irccloud.com/x-vpzhonusupvskvmg) (Excess Flood)
2020-11-12 02:18:19 angerman joins (sid209936@gateway/web/irccloud.com/x-mlhkemfvngmbvuol)
2020-11-12 02:19:28 <bqv> My gut feeling is it wouldnt be as effective as the pure haskell approach, since its kinda a mixture of both, but im happy to be corrected
2020-11-12 02:20:43 <koz_> bqv: If you need mutability (which is what I guess the problem in translation would be), you can have it with ST.
2020-11-12 02:21:06 <koz_> And it's pretty efficient as far as I'm aware.
2020-11-12 02:23:22 <bqv> For the specific example im looking at (nasty nested for loops) i wouldnt doubt, but if i were to try and use it for the whole port im doing, id have to find an analogue for pointers too, as well as any freaky memory tricks, so i think its fair to assume it'd be less effective without some pretty sharp optimizing
2020-11-12 02:23:57 <koz_> Uhh, we have pointers in GHC.
2020-11-12 02:24:00 <koz_> Of various stripes even.
2020-11-12 02:24:19 <koz_> And you can have 'nasty nested for-loops' in ST using ... wait for it... 'for'? :P
2020-11-12 02:24:28 <koz_> (or for_ if you just need mutation)
2020-11-12 02:25:01 <koz_> Like, I admit that it's not the nicest way to write Haskell, but it's neither particularly hard, nor particularly inefficient.
2020-11-12 02:25:27 <bqv> *shrug* i'll take your word for it, still steering clear
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2020-11-12 02:37:31 <jophish> Perhaps I'm having a moment, but is there a nicer way of using values at compile time in quasiquotes than: $(lift [q|...|]). For example, lets say I have a quasiquoter doing string interpolation (so [q|$x$y|] becomes `x <> y`) but I'd like to evaluate that at compile time
2020-11-12 02:37:41 <jophish> $(lift foo) seems pretty weird
2020-11-12 02:37:52 da39a3ee5e6b4b0d joins (~da39a3ee5@cm-171-98-69-228.revip7.asianet.co.th)
2020-11-12 02:38:13 <jophish> I mean, I guess I could incorporate the lift into the output of the quoter, but $([q|...|]) also looks quite clumsy
2020-11-12 02:38:59 × Sheilong quits (uid293653@gateway/web/irccloud.com/x-amyflsszyhqepalq) ()
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2020-11-12 02:41:56 <koz_> If you have QuasiQuotes turned on, and 'q' is a quasiquoter you defined, you can just do [q|..|]?
2020-11-12 02:43:17 <jophish> [q|$x$y|] will insert the expression `x <> y` (for this interpolating quasiquoter), but what I really want is a string literal with contents equal to `x <> y`
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2020-11-12 02:43:41 <jophish> stage restrictions notwithstanding
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2020-11-12 02:44:22 <jophish> I suppose perhaps a simpler example is, can I write a quasiquoter [file|x|] which will become the results of: `readFile x`
2020-11-12 02:44:33 <jophish> instead of becoming literally `readFile x`
2020-11-12 02:45:08 × merijn quits (~merijn@83-160-49-249.ip.xs4all.nl) (Ping timeout: 260 seconds)
2020-11-12 02:45:28 <jophish> This is tantamount to getting the RHS of declarations in a splice
2020-11-12 02:45:31 <jophish> which GHC doesn't support
2020-11-12 02:45:51 <jophish> so perhaps this two stage process (i.e. $([q|...|])) is necessary
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2020-11-12 02:51:18 <jophish> Seems quite relevant: https://stackoverflow.com/questions/48489622/why-is-there-no-representation-for-th-in-th
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