Bzlmod support for rules_haskell

[ylecornec]

Bzlmod is the new external dependency system for bazel and is not currently supported by rules_haskell.

• Ensure rules_haskell is compatible with the --enable_bzlmod option
  • build_bazel_rules_nodejs -> rules_js #1884
  • Bzlmod prerequisites #1885
  • Refactor WORKSPACE file #1886
  • stack_snapshot bzlmod support #1887
  • bzlmod python fix #1888
  • Preliminary changes for bzlmod #1891
  • Test bzlmod in CI #1893
  • Update rules_haskell runfiles_library #1894
  • Organize the repository in modules (in particular separate tests and nixpkgs integration) #1895
• Publish rules_haskell on the Bazel central registry #1896
• Add a module extension for bindist toolchains #1897
• Add a module extension for Nix provided toolchain #1898
• Add a module extension for Stackage packages #1899

Tasks

Beta Give feedback

1. build_bazel_rules_nodejs -> rules_js #1884
   +0
2. Bzlmod prerequisites #1885
   +0
3. Refactor WORKSPACE file #1886
   +0
4. stack_snapshot bzlmod support #1887
   +0
5. bzlmod python fix #1888
   +0
6. Preliminary changes for bzlmod #1891
   +0
7. Test bzlmod in CI #1893
   P2 +1
   
8. Update rules_haskell runfiles_library #1894
   +0
   
9. Organize the repository in modules (in particular separate tests and nixpkgs integration) #1895
   +0
   
10. Publish rules_haskell on the Bazel central registry #1896
    2 of 2
    P2 +1
    
11. Add a module extension for bindist toolchains #1897
    P2 +1
    
12. Add a module extension for Nix provided toolchain #1898
    P2 +1
13. Add a module extension for Stackage packages #1899
    P2 +1
    
14. Adapt start script to support bzlmod #2044
    +0
    

[aherrmann]

Sharing some relevant references:

• Bazel module documentation
• Bzlmod migration guide
• "Modularize" rules_sh rules_sh#18
• Add Publish to BCR templates rules_sh#37
• Modularize rules_nixpkgs rules_nixpkgs#181
• chore: add bzlmod bazel-contrib/rules-template#46

[aherrmann]

Similar to how we split rules_nixpkgs we would probably want to split out the rules_haskell rules_nixpkgs integration into its own module. (In the WORKSPACE world the nixpkgs integration is optional, but Bazel module does not support optional or conditional dependencies.)

[aherrmann]

@avdv IIUC this is essentially done, correct? The only missing pieces are the docs generation and the buildifier on NixOS thing that are blocking this, correct? I've changed the status of this accordingly to "Blocked". Let me know if that's accurate or not.

[avdv]

IIUC this is essentially done, correct? The only missing pieces are the docs generation and the buildifier on NixOS thing that are blocking this, correct? I've changed the status of this accordingly to "Blocked". Let me know if that's accurate or not.

Correct, thank you!

[avdv]

Separated the remaining tasks which are blocked on upstream / new Bazel versions into their own issues. Closing.