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2020-10-23 13:13:31 GyroW joins (~GyroW@ptr-48ujrfd1ztq5fjywfw3.18120a2.ip6.access.telenet.be)
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2020-10-23 13:23:43 <dminuoso> maerwald: Is there a way to select a version with ghcup without changing the default?
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2020-10-23 13:24:01 <maerwald> dminuoso: what do you mean exactly?
2020-10-23 13:24:12 <dminuoso> So we have a CI node with multiple GHC versions installed
2020-10-23 13:24:21 <maerwald> cabal build -w ghc-8.8.4?
2020-10-23 13:24:49 <dminuoso> maerwald: Cunning.
2020-10-23 13:25:01 <merijn> That's my local setup too :p
2020-10-23 13:25:01 <dminuoso> Can ghcup give me the path?
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2020-10-23 13:25:14 <maerwald> dminuoso: what path?
2020-10-23 13:25:14 <merijn> I just have all ghc's in my path (latest first)
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2020-10-23 13:25:24 <dminuoso> merijn: The path to an installed ghc
2020-10-23 13:25:29 <merijn> So "ghc" defaults to the latest and specific version go to those
2020-10-23 13:25:30 <maerwald> dminuoso: ghcup paths are predictable
2020-10-23 13:25:41 <maerwald> ~/.ghcup/ghc/8.8.4/bin/ghc or something
2020-10-23 13:26:06 <dminuoso> maerwald: Well it'd still feel better if there was a sort of `--list-ghc` command, such I could say `cabal build -w $(ghcup --list-bin ghc-8.6.5)` or some such
2020-10-23 13:26:27 <dminuoso> Rather than encoding internals of ghcup into CI job descriptions
2020-10-23 13:26:28 <maerwald> You don't trust your PATH?
2020-10-23 13:26:45 <dminuoso> maerwald: Again, I have multiple concurrent GHC versions installed
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2020-10-23 13:27:07 jud^ joins (~jud@cpe-70-113-106-222.austin.res.rr.com)
2020-10-23 13:27:10 <maerwald> cabal build -w ~/.ghcup/bin/ghc-8.8.4
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2020-10-23 13:28:38 <dminuoso> I still feel like ghc should offer plumbing commands.
2020-10-23 13:28:40 <dminuoso> *ghcup
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2020-10-23 13:28:59 <merijn> lifehack: https://github.com/merijn/dotfiles/blob/master/dotfiles/bash_env#L24-L28 ;)
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2020-10-23 13:28:59 <merijn> Needs some tweaking to match ghcup's paths, though
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2020-10-23 13:29:19 <merijn> dminuoso: So, if you have them all in your path then "ghc-8.8.4" will "just work"
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2020-10-23 13:29:36 <maerwald> I don't really understand the problem here
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2020-10-23 13:31:19 <dminuoso> merijn: Ah, indeed they are!
2020-10-23 13:31:36 <dminuoso> That's nice and works well
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2020-10-23 13:31:54 <dminuoso> Has the added advantage that the CI doesnt make assumptions about ghcup being installed
2020-10-23 13:31:54 <merijn> dminuoso: Then the trick is just to have the right "default" GHC first so that "ghc" pick the right one (which might not be important for CI)
2020-10-23 13:32:01 <dminuoso> It just demands a particular GHC version to be in path
2020-10-23 13:32:03 <dminuoso> :)
2020-10-23 13:32:15 <dminuoso> merijn: in case of ghcup, ghc itself is a symlink managed by ghcup
2020-10-23 13:32:17 <dminuoso> I didnt know that
2020-10-23 13:32:21 <dminuoso> I thought ghcup did PATH manipulation
2020-10-23 13:32:42 <dminuoso> Cheers this is good
2020-10-23 13:33:25 <maerwald> dminuoso: no, you have to modify PATH yourself, that's why we get mac users every day asking here how to do that
2020-10-23 13:33:34 <dminuoso> heh
2020-10-23 13:33:36 <dminuoso> fair enough
2020-10-23 13:33:43 <dminuoso> well, at any rate. merijn's suggested answer is good :)
2020-10-23 13:34:28 <maerwald> if you don't want to expose the symlinks, you can just export ~/.ghcup/ghc/<ver>/bin
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2020-10-23 13:57:57 hackage path-io 1.6.2 - Interface to ‘directory’ package for users of ‘path’ https://hackage.haskell.org/package/path-io-1.6.2 (mrkkrp)
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