Tutorial: Rust FFI in Haskell #24
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I wanted to write a blog post about this, rather than publishing it as a tutorial in either community.flake.parts or here, as I wanted to describe the entire process, as I debugged, in the form of a story. |
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Is this still being written? You also want to,
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Yes, I have to resume work on this |
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Associated repo (I think): https://github.com/shivaraj-bh/haskell-rust-ffi-template |
Additionally change the introduction to be more tutorial-like and add the rust library section. Also, add placeholders for other sections.
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It is more appropriate as a tutorial series under Nix for development, so I have made the necessary changes and added placeholders, will be filling them up soon. |
shivaraj-bh
changed the title
en/haskell-rust-ffi.md
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| nixpkgs_url="github:nixos/nixpkgs/$(nix flake metadata --json | nix run nixpkgs#jq -- '.locks.nodes.nixpkgs.locked.rev' -r)" && \ | ||
| nix shell $nixpkgs_url#cabal-install $nixpkgs_url#ghc -c \ | ||
| cabal init -n --exe -m --simple hello-haskell |
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| nixpkgs_url="github:nixos/nixpkgs/$(nix flake metadata --json | nix run nixpkgs#jq -- '.locks.nodes.nixpkgs.locked.rev' -r)" && \ | |
| nix shell $nixpkgs_url#cabal-install $nixpkgs_url#ghc -c \ | |
| cabal init -n --exe -m --simple hello-haskell | |
| nix shell nixpkgs#ghc nixpkgs#cabal-install -c cabal -- init -n --exe -m --simple hello-haskell |
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This will break the further steps in the tutorial, as we are assuming that the .cabal file generated by cabal-install in flake:nixpkgs will work with the nixpkgs input of the flake in the tutorial.
This was the initial command, but when I was following along the tutorial it fails, as constraints on base depends on GHC version, which can be different based on the nixpkgs commit. I doubt there is a way to cabal init without any constraints on the base package.
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Pass -d base option?
❯ nix shell nixpkgs#ghc nixpkgs#cabal-install -c cabal -- init -n --exe -m --simple -d base --overwrite
Warning: The package list for 'hackage.haskell.org' does not exist. Run 'cabal
update' to download it.
[Log] Using cabal specification: 3.0
[Warning] unknown license type, you must put a copy in LICENSE yourself.
[Log] CHANGELOG.md already exists. Backing up old version in CHANGELOG.md.save0
[Log] Overwriting file CHANGELOG.md...
[Log] app already exists. Backing up old version in app.save1
[Log] Overwriting directory ./app...
[Log] Creating fresh file app/Main.hs...
[Log] hello-haskell.cabal already exists. Backing up old version in hello-haskell.cabal.save0
[Log] Overwriting file hello-haskell.cabal...
[Warning] No synopsis given. You should edit the .cabal file and add one.
[Info] You may want to edit the .cabal file and add a Description field.
srid on appreciate.intern /tmp/hello-haskell via λ
❯ rg base *.cabal
14: build-depends: base
Co-authored-by: Sridhar Ratnakumar <[email protected]>
Co-authored-by: Sridhar Ratnakumar <[email protected]>
Co-authored-by: Sridhar Ratnakumar <[email protected]>
Co-authored-by: Sridhar Ratnakumar <[email protected]>
Co-authored-by: Sridhar Ratnakumar <[email protected]>
Co-authored-by: Sridhar Ratnakumar <[email protected]>
… haskell-rust-ffi
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@shivaraj-bh Feel free to announce in https://twitter.com/nixos_asia, Zulip, and elsewhere as you see fit. |
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I probably should’ve linked this earlier here, but I was waiting on this before merging: srid/haskell-flake#283 (comment) |
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Okay let's announce it after I fix that issue. |
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@srid could you generate an image for this article? |
preview: