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2020-11-06 08:00:00 hackage morloc 0.33.0 - A multi-lingual, typed, workflow language https://hackage.haskell.org/package/morloc-0.33.0 (arendsee)
2020-11-06 08:00:04 × pera quits (pera@gateway/vpn/mullvad/pera) (Ping timeout: 246 seconds)
2020-11-06 08:00:34 <sclv> w00t
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2020-11-06 08:01:47 <loximann> I guess the environment file .ghc_hide/x86_64-linux-8.8.4/environments/default was broken somehow
2020-11-06 08:01:53 <loximann> I'll look into that. Thanks :-)
2020-11-06 08:02:12 <sclv> cabal can write to it depending on the version and configuration
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2020-11-06 08:02:19 × codygman quits (~codygman@47-184-107-46.dlls.tx.frontiernet.net) (Read error: Connection reset by peer)
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2020-11-06 08:04:20 <loximann> Weird. All the packages seem to be listed in the environment file
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2020-11-06 08:07:57 <loximann> Alright, apparently there was a left over cache lock? I removed .ghc/x86_64-linux-8.8.4/package.conf.d/package.cache.lock and it all seems to work
2020-11-06 08:08:26 × thir quits (~thir@p200300f27f0b7e00f4e9381c2bf90854.dip0.t-ipconnect.de) (Ping timeout: 264 seconds)
2020-11-06 08:10:50 <loximann> Thanks a lot for your help! :-D
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2020-11-06 08:16:14 <Uniaika> have a nice one, loximann :)
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2020-11-06 08:22:01 hackage yesod-auth 1.6.10.1 - Authentication for Yesod. https://hackage.haskell.org/package/yesod-auth-1.6.10.1 (MichaelSnoyman)
2020-11-06 08:22:10 × christo quits (~chris@81.96.113.213) (Remote host closed the connection)
2020-11-06 08:23:54 <jchia> Without using temp files or writing to another file, how can I remove lines with a certain prefix from a UTF-8 text file using only memory that scales with the size of the prefix or at most the size of the longest line? I know the idea but want to know how to express it elegantly in Haskell.
2020-11-06 08:24:37 <jchia> i can even simplify the problem and say the file encoding is latin-1.
2020-11-06 08:25:11 <pjb> read line, write line or not, repeat.
2020-11-06 08:25:15 <jophish> sed '/^prefix/d'
2020-11-06 08:25:43 <jchia> jophish: I know sed can do it. I just want to do it simply in Haskell
2020-11-06 08:25:46 <pjb> The trick is that either you open the file twice, or you just between the read position and the write position.
2020-11-06 08:25:55 <jchia> pjb: If I write to the file while reading, will I get data corruption?
2020-11-06 08:26:00 <pjb> Nope.
2020-11-06 08:26:09 <pjb> Because you are only _removing_ lines.
2020-11-06 08:26:23 <jchia> pjb: open with two handles, one for read one for write?
2020-11-06 08:26:48 <pjb> Well, you have to be careful, because if you remove a small line, while copying a big following lines, indeed you would have an overlap.
2020-11-06 08:27:00 <pjb> Better to use fixed buffers.
2020-11-06 08:28:04 <pjb> The simpliest is to use a temporary file.
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2020-11-06 08:29:08 <jchia> I'll just do it the naive way. It's not a real problem I have to solve as the file is not that big. Just wondering if there is an elegant way to do it with a low memory footprint.
2020-11-06 08:29:34 × jedws quits (~jedws@101.184.150.81) (Quit: My MacBook has gone to sleep. ZZZzzz…)
2020-11-06 08:29:41 <pjb> If the file can be read entirely in RAM, then indeed, read, split, delete, write.
2020-11-06 08:29:59 <pjb> In that case you may use a single file, if you have access to a truncate(2) syscall.
2020-11-06 08:30:01 hackage yesod-persistent 1.6.0.5 - Some helpers for using Persistent from Yesod. https://hackage.haskell.org/package/yesod-persistent-1.6.0.5 (MichaelSnoyman)
2020-11-06 08:30:18 <pjb> It's not in POSIX, but in BSD and Linux.
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2020-11-06 08:32:44 <merijn> pjb: Why even bother "removing lines"?
2020-11-06 08:32:47 → borne joins (~fritjof@200116b864a45200fbd62cc7430251a2.dip.versatel-1u1.de)
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2020-11-06 08:33:12 <pjb> fixed-size record files are easier to work with.
2020-11-06 08:33:17 <merijn> You just gotta keep track of the end of the last "keep" line and copy the next "keep" line after there
2020-11-06 08:33:28 <merijn> You can never overlap data you care about that way
2020-11-06 08:33:40 <merijn> Since you only ever copy data "forward"
2020-11-06 08:34:17 <merijn> jchia: It can be done, whether it's worth the effort is the real question
2020-11-06 08:35:30 × hive-mind quits (~hivemind@rrcs-67-53-148-69.west.biz.rr.com) (Ping timeout: 272 seconds)
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2020-11-06 08:38:57 <tomsmeding> can be a nice learning task I guess, it's not too hard to do it this way
2020-11-06 08:39:11 × watt540 quits (~watt540@124.123.105.19) (Remote host closed the connection)
2020-11-06 08:39:14 <tomjaguarpaw> Is there a simple and well-maintained CI setup for Haskell packages that people recommend these days?
2020-11-06 08:39:22 × christo quits (~chris@81.96.113.213) (Remote host closed the connection)
2020-11-06 08:39:23 <tomjaguarpaw> I have been using Travis, but the writing is on the wall.
2020-11-06 08:39:30 hackage yesod-auth-oauth 1.6.0.2 - OAuth Authentication for Yesod. https://hackage.haskell.org/package/yesod-auth-oauth-1.6.0.2 (MichaelSnoyman)
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2020-11-06 08:43:46 <merijn> Github Actions? :p
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2020-11-06 08:50:26 <Uniaika> tomjaguarpaw: GitHub Actions
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2020-11-06 08:51:54 <tomjaguarpaw> I mean is there simple and well-maintained Haskell code to use the CI service :D
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2020-11-06 08:53:22 <dminuoso> tomjaguarpaw: gitlab-ci+gitlab-runner
2020-11-06 08:53:31 <dminuoso> Jenkins
2020-11-06 08:53:39 <dminuoso> Anything that can run a single `cabal build` works for 95% of hackage.
2020-11-06 08:53:47 <dminuoso> (Or stack equivalent)
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2020-11-06 08:54:51 <dminuoso> Fundamentally, my gitlab ci jobs do nothing more than `cabal build ...; cp $(cabal-plan list-bin ...) ...`
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