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Logs: freenode/#haskell

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2020-11-14 10:20:53 → solonarv joins (~solonarv@astrasbourg-653-1-156-155.w90-6.abo.wanadoo.fr)
2020-11-14 10:20:57 × xerox_ quits (~xerox@unaffiliated/xerox) (Ping timeout: 260 seconds)
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2020-11-14 10:44:33 × ensyde quits (~ensyde@99-185-235-117.lightspeed.chrlnc.sbcglobal.net) (Ping timeout: 260 seconds)
2020-11-14 10:44:59 → plutoniix joins (~q@node-ujy.pool-125-24.dynamic.totinternet.net)
2020-11-14 10:45:27 → kuribas joins (~user@ptr-25vy0i82x0ic2ow7do5.18120a2.ip6.access.telenet.be)
2020-11-14 10:45:59 <kuribas> if I return (pure foo :: IO Foo), does foo get evaluated to WHNF?
2020-11-14 10:46:29 <merijn> That does nothing to foo
2020-11-14 10:47:26 × xff0x quits (~fox@2001:1a81:522c:400:5e4f:911d:8651:d35d) (Ping timeout: 264 seconds)
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2020-11-14 10:47:48 → SweetAmy19 joins (~hey@45.133.182.164)
2020-11-14 10:47:59 <kuribas> if I have "withFile fp mode $ \h -> foo", how do I ensure the result of foo is in WHNF
2020-11-14 10:48:00 <kuribas> ?
2020-11-14 10:48:38 × royal_screwup21 quits (52254809@gateway/web/cgi-irc/kiwiirc.com/ip.82.37.72.9) (Ping timeout: 260 seconds)
2020-11-14 10:48:51 <maerwald> why do you care?
2020-11-14 10:48:57 <merijn> eh, with lots of pain and effort
2020-11-14 10:49:05 <merijn> Allow me to recommen a better solution
2020-11-14 10:49:12 <merijn> Don't use lazy IO so it doesn't matter
2020-11-14 10:49:35 <kuribas> well it will work if the argument is in WHNF
2020-11-14 10:49:45 → ensyde joins (~ensyde@99-185-235-117.lightspeed.chrlnc.sbcglobal.net)
2020-11-14 10:49:45 SweetAmy19 19/f looking for older. This is me naked: https://imagetwist.com/c60gumtcigj7/nude5.jpg Do you like my pussy?
2020-11-14 10:50:04 <merijn> It's that time of year where freenode gets spammed again?
2020-11-14 10:50:23 <maerwald> Christmas is a lonely time
2020-11-14 10:51:10 <hc> kuribas: could you give a bit more context? what are you trying to do?
2020-11-14 10:51:23 <kuribas> hc: I am writing an xml parser on top of hexpat
2020-11-14 10:52:30 <merijn> Just read the entire file strictly, presumably any (sane) XML file will be a few MB max anyway
2020-11-14 10:52:43 SweetAmy19 19/f looking for older. This is me naked: https://imagetwist.com/c60gumtcigj7/nude5.jpg Do you like my pussy?
2020-11-14 10:53:04 → whatisRT joins (~whatisRT@ip5b416a33.dynamic.kabel-deutschland.de)
2020-11-14 10:53:09 <merijn> @where ops
2020-11-14 10:53:09 <lambdabot> byorgey Cale conal copumpkin dcoutts dibblego dolio edwardk geekosaur glguy jmcarthur johnw mniip monochrom quicksilver shachaf shapr ski
2020-11-14 10:53:13 <kuribas> merijn: well, it's supposed to be a "streaming parser".
2020-11-14 10:53:32 <SweetAmy19> 19/f looking for older. This is me naked: https://imagetwist.com/c60gumtcigj7/nude5.jpg Do you like my pussy?
2020-11-14 10:53:35 <merijn> kuribas: Well, there's a reason conduit & co were invented
2020-11-14 10:53:50 <kuribas> merijn: conduit will be supported as well :)
2020-11-14 10:54:01 × SweetAmy19 quits (~hey@45.133.182.164) (Remote host closed the connection)
2020-11-14 10:54:18 → jonatanb joins (~jonatanb@83.24.155.27.ipv4.supernova.orange.pl)
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2020-11-14 10:54:29 → Ariakenom joins (~Ariakenom@h-82-196-111-82.NA.cust.bahnhof.se)
2020-11-14 10:57:45 <kuribas> merijn: what about pure $! foo ?
2020-11-14 10:58:50 × plutoniix quits (~q@node-ujy.pool-125-24.dynamic.totinternet.net) (Quit: Leaving)
2020-11-14 10:59:30 <kuribas> that should first evaluate foo no WHNF, then return it from the IO action.
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2020-11-14 11:00:10 × shatriff quits (~vitaliish@176.52.219.10) (Remote host closed the connection)
2020-11-14 11:00:53 <kuribas> merijn: it can be still handy to parse a huge file in constant space. I know LazyIO is quick and dirty, but sometimes that's all you need :)
2020-11-14 11:01:03 → directhex1 joins (~directhex@139.28.218.148)
2020-11-14 11:02:15 <kuribas> that seems to work: pure undefined >> pure 3 => 3
2020-11-14 11:02:15 <kuribas>
2020-11-14 11:02:24 <kuribas> (pure $! undefined) >> pure 3 => *** Exception: Prelude.undefined
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2020-11-14 11:06:51 → Varis joins (~Tadas@unaffiliated/varis)
2020-11-14 11:08:30 <kuribas> merijn: note that my function is safe, because to ensure that the xml contains no errors it has to read the whole file. Well at least the portion that needs to be parsed.
2020-11-14 11:08:52 <kuribas> merijn: so evaluating to WHNF will ensure a complete read.
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2020-11-14 11:21:07 → HaskellYogi joins (~vivekrama@49.207.205.17)
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2020-11-14 11:25:54 <HaskellYogi> Hello all, I am unable to use the if statement given in the code here. https://pastebin.com/BvTCXhLr Can someone suggest an alternative
2020-11-14 11:26:34 <kuribas> HaskellYogi: what's the value of total when flag is False?
2020-11-14 11:26:42 → alp joins (~alp@2a01:e0a:58b:4920:500f:4850:8bc3:6c93)
2020-11-14 11:27:07 <kuribas> HaskellYogi: you need to invert it: let total |flag = ... | otherwise = ...
2020-11-14 11:27:48 <kuribas> and modVal is indented wrong
2020-11-14 11:27:51 <HaskellYogi> when false is false I want total = (modChr char) - (getKeyToInt key ) when true total = (modChr char) + (getKeyToInt key )
2020-11-14 11:28:40 <HaskellYogi> @kuribas modval is part of let statement
2020-11-14 11:28:40 <lambdabot> Unknown command, try @list
2020-11-14 11:29:33 <kuribas> so let total | flag = (modChr char) + ... | otherwise = (modChr char) - ...
2020-11-14 11:29:51 <kuribas> HaskellYogi: and put modVal on the same column as total
2020-11-14 11:30:08 × Alleria_ quits (~AllahuAkb@2604:2000:1484:26:38df:6fa9:13ce:5626) (Quit: Textual IRC Client: www.textualapp.com)
2020-11-14 11:30:18 <HaskellYogi> okay let me invert and see
2020-11-14 11:30:26 <kuribas> HaskellYogi: alternatively let total = if flag then ... else ...
2020-11-14 11:30:34 <kuribas> but I prefer guards
2020-11-14 11:32:03 <kuribas> HaskellYogi: or a third way: total = (if flag then (+) else (-)) (modCHar char) (getKeyToInt key)
2020-11-14 11:32:30 <kuribas> wether that's clearer is debatable
2020-11-14 11:32:42 × todda7 quits (~torstein@ppp-2-84-17-169.home.otenet.gr) (Ping timeout: 260 seconds)
2020-11-14 11:33:08 <HaskellYogi> Thanks a ton this works https://pastebin.com/dBj3F4m1 I learned something new today
2020-11-14 11:34:11 <kuribas> HaskellYogi: indentation is a bit weird, but that should work
2020-11-14 11:34:17 → heatsink joins (~heatsink@107-136-5-69.lightspeed.sntcca.sbcglobal.net)
2020-11-14 11:34:58 <HaskellYogi> why do you say @kuribas, can you please show me the right way, so that I can improve
2020-11-14 11:36:47 <kuribas> there is not a "right way", but I prefer this: https://gist.github.com/kuribas/a5226405be7c9209bc1978236b93b660
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