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2020-10-03 23:46:41 × vicfred quits (~vicfred@unaffiliated/vicfred) (Quit: Leaving)
2020-10-03 23:46:45 <dsal> e.g., instance FromJSON YourThing where parseJSON = genericParseJSON jsonOpts{ fieldLabelModifier = dropWhile '_'
2020-10-03 23:46:51 <dsal> Something like that. And then a }
2020-10-03 23:47:52 × ft quits (~ft@shell.chaostreff-dortmund.de) (Ping timeout: 260 seconds)
2020-10-03 23:48:05 <OmegaDoug> dsal, thanks. I was looking for a concise solution. The other solutions I found online had a lot more code involved. I'll give that a try.
2020-10-03 23:48:44 <dsal> fieldLabelModifier is a simple function that rewrites your field name to match a JSON field. You can do lots of things there pretty easily.
2020-10-03 23:48:58 × heatsink quits (~heatsink@107-136-5-69.lightspeed.sntcca.sbcglobal.net) (Remote host closed the connection)
2020-10-03 23:50:57 × finkata quits (~dpetrov@83.222.188.39) (Read error: Connection reset by peer)
2020-10-03 23:54:12 × nbloomf quits (~nbloomf@2600:1700:83e0:1f40:683c:11e3:ba18:6adc) (Quit: My MacBook has gone to sleep. ZZZzzz…)
2020-10-03 23:56:02 → d34df00d joins (~d34df00d@104-14-27-213.lightspeed.austtx.sbcglobal.net)
2020-10-03 23:56:04 <d34df00d> Hi!
2020-10-03 23:57:22 <d34df00d> I want to parse an XML file and fold over the values of some of the nodes. Is there anything that'd stream the file as well?
2020-10-03 23:57:32 <d34df00d> I wrote something with hxt, but it seems to load the whole file in memory.
2020-10-03 23:59:26 <dsal> I used xeno a while back. It was pretty easy.
2020-10-03 23:59:29 <d34df00d> Namely, I wrote this, and, judging by memory consumption, it indeed loads the whole file:
2020-10-03 23:59:34 <d34df00d> https://bpaste.net/RVMA
2020-10-03 23:59:47 <d34df00d> dsal: thanks! Never used (or even heard about) xeno before, will look at ti!
2020-10-04 00:00:02 × kers quits (~kers@185.204.1.185) ()
2020-10-04 00:00:28 <dsal> I don't have to deal with xml very much, so I don't know what's best, but that worked well for me. :)
2020-10-04 00:00:52 × takuan quits (~takuan@178-116-218-225.access.telenet.be) (Remote host closed the connection)
2020-10-04 00:01:18 <d34df00d> Yeah, same here. Last time I had to parse XML before was... well, I don't even remember!
2020-10-04 00:01:39 → jedii joins (~g@209.6.150.53)
2020-10-04 00:01:49 <jedii> anyoine using happstack.com? looks sick
2020-10-04 00:02:04 × jedii quits (~g@209.6.150.53) (Quit: leaving)
2020-10-04 00:05:41 <d34df00d> Dang, Xeno.SAX is strict on the bytestrings.
2020-10-04 00:06:31 <dsal> I wasn't using it for anything big.
2020-10-04 00:06:36 <d34df00d> …but there's bytestring-mmap!
2020-10-04 00:07:00 → borne joins (~fritjof@200116b864ada80007933c164a08810c.dip.versatel-1u1.de)
2020-10-04 00:10:25 → ft joins (~ft@shell.chaostreff-dortmund.de)
2020-10-04 00:11:23 × livvy quits (~livvy@gateway/tor-sasl/livvy) (Ping timeout: 240 seconds)
2020-10-04 00:16:30 → conal joins (~conal@66.115.157.94)
2020-10-04 00:16:38 × cosimone quits (~cosimone@2001:b07:ae5:db26:b248:7aff:feea:34b6) (Quit: Quit.)
2020-10-04 00:16:52 <cohn> hi, how do I create a minimal .cabal file for experimenting?
2020-10-04 00:17:50 × jedws quits (~jedws@121.209.139.222) (Quit: My MacBook has gone to sleep. ZZZzzz…)
2020-10-04 00:18:38 → jedws joins (~jedws@121.209.139.222)
2020-10-04 00:18:55 × Tuplanolla quits (~Tuplanoll@91-159-68-239.elisa-laajakaista.fi) (Ping timeout: 240 seconds)
2020-10-04 00:20:13 × jgt quits (~jgt@188.239.64.32) (Ping timeout: 265 seconds)
2020-10-04 00:20:35 <OmegaDoug> Aeson fieldLabelModifier doesn't seem to get applied to by data type. I can't see what I'm doing which is different from any online example. I'm wondering if I could get a second set of eyes: https://gist.github.com/DouglasBrunner/5bf94447f57db989f9df5b6682a7fdf6
2020-10-04 00:24:02 → fendor__ joins (~fendor@178.165.130.169.wireless.dyn.drei.com)
2020-10-04 00:24:39 <dsal> cohn: I just use stack, tbh. But stack will make your cabal file for you.
2020-10-04 00:25:16 <dsal> OmegaDoug: Why would you expect the latter?
2020-10-04 00:25:42 <dsal> Er, *not* expect the latter. I think you're looking at different things.
2020-10-04 00:26:36 × fendor_ quits (~fendor@91.141.0.198.wireless.dyn.drei.com) (Ping timeout: 260 seconds)
2020-10-04 00:26:37 <OmegaDoug> dsal, I think I'm making a simple mistake and didn't encode it.
2020-10-04 00:26:53 <OmegaDoug> I think I'm just printing the output directly.
2020-10-04 00:27:15 <dsal> You're using the Show instance, which isn't related to JSON (it's not even valid JSON).
2020-10-04 00:27:17 <OmegaDoug> printing the type as serialized by Show, not as serialized by Aeson
2020-10-04 00:27:29 <OmegaDoug> Yeah, you beat me to it. ;)
2020-10-04 00:27:50 <dsal> But you also don't want "drop 1" here.
2020-10-04 00:28:03 × ech quits (~user@gateway/tor-sasl/ech) (Ping timeout: 240 seconds)
2020-10-04 00:28:13 × hiroaki quits (~hiroaki@ip4d176049.dynamic.kabel-deutschland.de) (Ping timeout: 260 seconds)
2020-10-04 00:28:23 <dsal> `dropWhile (== '_')` would be safer, unless you prefix all your fields with `_` (which is common in lens code, anyway)
2020-10-04 00:29:36 <OmegaDoug> I agree 100%. But when I was mistakenly using "Show" instead of "toJson" I wanted to use a function which should have been guaranteed to work. I'll switch back to dropWhile once I have it working.
2020-10-04 00:30:01 → ech joins (~user@gateway/tor-sasl/ech)
2020-10-04 00:30:22 × mozzarella quits (~sam@unaffiliated/sam113101) (Ping timeout: 265 seconds)
2020-10-04 00:30:27 hackage immortal-worker 0.1.0.0 - Create worker threads that logs exceptions and restarts. https://hackage.haskell.org/package/immortal-worker-0.1.0.0 (NCrashed)
2020-10-04 00:31:16 <OmegaDoug> dsal, it's working perfectly now. Thanks for the help.
2020-10-04 00:31:51 <dsal> Yeah. I've spent a bunch of time in weird bits of aeson
2020-10-04 00:32:34 × carlomagno1 quits (~cararell@inet-hqmc02-o.oracle.com) (Ping timeout: 256 seconds)
2020-10-04 00:32:41 → thir joins (~thir@p200300f27f0fc60004d129737887aa72.dip0.t-ipconnect.de)
2020-10-04 00:34:05 → mozzarella joins (~sam@unaffiliated/sam113101)
2020-10-04 00:36:57 × thir quits (~thir@p200300f27f0fc60004d129737887aa72.dip0.t-ipconnect.de) (Ping timeout: 260 seconds)
2020-10-04 00:37:53 <d34df00d> dsal: yeah, xeno is super fast, modulo a space leak in their `fold` abstraction.
2020-10-04 00:38:00 <d34df00d> (modify instead of modify'? srsly?)
2020-10-04 00:38:08 <d34df00d> Thanks for pointing me to that!
2020-10-04 00:38:14 <OmegaDoug> I was looking through https://artyom.me/aeson and it's a library with a large surface area. I'll be curious to see how it is to work with compared with some of the JSON libraries I regularly use at work going forward.
2020-10-04 00:38:29 <dsal> d34df00d: Cool. Yeah, nobody uses xml, so it's not surprising it has bad parts. heh
2020-10-04 00:39:21 <OmegaDoug> We use XML a fair bit. We favour JSON, but XML is hard to escape.
2020-10-04 00:39:33 <dsal> &lt;
2020-10-04 00:40:24 <dsal> aeson + lens is pretty magical. Advent of code 2015 had a problem where you had to calculate the sum of all of the numbers in an arbitrary xml document. It's like, 40 characters of code.
2020-10-04 00:42:19 → lemmih_ joins (~lemmih@218.186.157.57)
2020-10-04 00:42:25 × ddellacosta quits (~dd@86.106.121.168) (Ping timeout: 240 seconds)
2020-10-04 00:44:25 × lemmih quits (~lemmih@2406:3003:2072:44:640b:57cc:705a:e759) (Ping timeout: 240 seconds)
2020-10-04 00:45:03 <cohn> dsal: I'm just trying to make a sandbox. Looks like I can just run `stack init` but I don't see where to plug in the package names I want to use in stack.yaml
2020-10-04 00:45:43 <dsal> Oh. Now I'm curious how you've been building stuff. heh
2020-10-04 00:46:26 → snakemasterflex joins (~snakemast@213.100.206.23)
2020-10-04 00:47:02 <dsal> cohn: I have a template I use when starting projects. Here's an example of what that might look like: stack new awesomeproject https://gist.githubusercontent.com/dustin/e1a519e6d699ceb04c7542afe0282d56/raw/8066c389ff14799bddbb9278c5d986c20ed6d4b9/mytemplate.hsfiles
2020-10-04 00:47:17 → nbloomf joins (~nbloomf@2600:1700:83e0:1f40:9dc0:c910:ee4d:fcdf)
2020-10-04 00:47:35 <dsal> (that's my default template, so I just do 'stack new awesomeproject' and start running stuff)
2020-10-04 00:47:48 <cohn> nice! thanks
2020-10-04 00:47:52 <dsal> Packages don't go in stack.yaml, but in package.yaml
2020-10-04 00:48:15 <dsal> I don't have a lot of default deps other than for tests.
2020-10-04 00:48:18 <cohn> I created a package.yaml but when I run `stack ghci`, it doesn't install anything
2020-10-04 00:48:51 <dsal> It shouldn't "install" anything. It's going to grab deps for whatever it's making a repl for.
2020-10-04 00:48:56 <dsal> e.g. try that in this project: https://github.com/dustin/gopro/blob/master/package.yaml :)
2020-10-04 00:49:02 <cohn> ok
2020-10-04 00:49:03 × nbloomf quits (~nbloomf@2600:1700:83e0:1f40:9dc0:c910:ee4d:fcdf) (Client Quit)
2020-10-04 00:49:30 → heatsink joins (~heatsink@107-136-5-69.lightspeed.sntcca.sbcglobal.net)
2020-10-04 00:49:51 <dsal> (don't actually try that in that project -- it uses half of hackage)
2020-10-04 00:50:07 <cohn> yea, I noticed... yeesh! :D
2020-10-04 00:51:20 × snakemasterflex quits (~snakemast@213.100.206.23) (Ping timeout: 260 seconds)
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2020-10-04 00:52:58 <cohn> hmm. still nothing.
2020-10-04 00:53:55 × heatsink quits (~heatsink@107-136-5-69.lightspeed.sntcca.sbcglobal.net) (Ping timeout: 240 seconds)
2020-10-04 00:54:35 <cohn> ah, fixed it! I had to comment out the "packages: []" line in stack.yaml
2020-10-04 00:55:11 <cohn> suhweeeet
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2020-10-04 00:56:28 <cohn> dsal: thanks yet again! You should probably start charging for support. hehe
2020-10-04 00:56:47 × xff0x quits (~fox@2001:1a81:528f:c400:e801:3cdf:9d3a:43d8) (Ping timeout: 260 seconds)
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