Problem trying to use vscode's Haskell extension

[Pi-Cla]

When I open this project on vscode with the Haskell extension I get this error:

Failed to find the GHC version of this Cabal project. Error when calling cabal exec -v0 -- ghc --print-libdir

Additionally when I run the command itself I gets this other strange error:

Error: cabal: Could not resolve dependencies:
[__0] trying: pandoc-3.1.12.3 (user goal)
[__1] next goal: zip-archive (dependency of pandoc)
[__1] rejecting: zip-archive-0.4.3 (conflict: pandoc => zip-archive>=0.4.3.1
&& <0.5)
[__1] skipping: zip-archive-0.4.2.2, zip-archive-0.4.2.1, zip-archive-0.4.2,
zip-archive-0.4.1, zip-archive-0.4, zip-archive-0.3.3, zip-archive-0.3.2.5,
zip-archive-0.3.2.4, zip-archive-0.3.2.3, zip-archive-0.3.2.2,
zip-archive-0.3.2.1, zip-archive-0.3.2, zip-archive-0.3.1.1,
zip-archive-0.3.1, zip-archive-0.3.0.7, zip-archive-0.3.0.6,
zip-archive-0.3.0.5, zip-archive-0.3.0.4, zip-archive-0.3.0.2,
zip-archive-0.3.0.1, zip-archive-0.3, zip-archive-0.2.3.7,
zip-archive-0.2.3.6, zip-archive-0.2.3.5, zip-archive-0.2.3.4,
zip-archive-0.2.3.3, zip-archive-0.2.3.2, zip-archive-0.2.2.1,
zip-archive-0.2.2, zip-archive-0.2.1, zip-archive-0.2, zip-archive-0.1.4,
zip-archive-0.1.3.4, zip-archive-0.1.3.3, zip-archive-0.1.3.2,
zip-archive-0.1.3.1, zip-archive-0.1.3, zip-archive-0.1.2.1,
zip-archive-0.1.1.8, zip-archive-0.1.1.7, zip-archive-0.1.1.6,
zip-archive-0.1.1.5, zip-archive-0.1.1.4, zip-archive-0.1.1.3,
zip-archive-0.1.1.2, zip-archive-0.1.1.1, zip-archive-0.1.1, zip-archive-0.1,
zip-archive-0.2.3.1, zip-archive-0.2.3 (has the same characteristics that
caused the previous version to fail: excluded by constraint '>=0.4.3.1 &&
<0.5' from 'pandoc')
[__1] fail (backjumping, conflict set: pandoc, zip-archive)
After searching the rest of the dependency tree exhaustively, these were the
goals I've had most trouble fulfilling: pandoc, zip-archive

[tayllana]

The error message you're encountering suggests there's a problem with resolving dependencies for your Haskell project, particularly with the pandoc and zip-archive packages. Here's how you might troubleshoot and resolve these issues:

1. GHC Version and Cabal Project: Ensure that you have GHC (Glasgow Haskell Compiler) installed on your system and that it's accessible in your system's PATH. Also, ensure that your Cabal project is properly configured. You might want to check if you have a cabal.project file in your project directory with appropriate settings.

2. GHC Version Detection: The error "Failed to find the GHC version of this Cabal project" suggests that the Haskell extension for VSCode is having trouble detecting the GHC version used by your project. Make sure you have the correct GHC version installed and that it's properly configured in your development environment. You may need to manually specify the GHC version in your project settings or ensure that the Haskell extension can detect it properly.

3. Dependency Resolution: The error related to pandoc and zip-archive indicates a dependency conflict. It seems like pandoc requires a version of zip-archive that conflicts with the available versions. You may need to update the version constraints in your Cabal file (project.cabal) to resolve this conflict. Try relaxing the version constraints for zip-archive or updating the constraints to match the required versions.

4. Dependency Solver: Cabal is attempting to resolve dependencies but failing due to conflicting constraints. You might try running cabal update to ensure your local package list is up to date, and then attempt to resolve dependencies again. Sometimes, dependency issues can be resolved by cleaning the build and reinstalling dependencies.

5. Stackage Snapshots: If you're using Stackage for package management, try using a different snapshot or LTS version that might have compatible versions of pandoc and zip-archive. Updating your stack.yaml file with a different resolver may help resolve dependency conflicts.

6. Manual Dependency Management: If all else fails, you might consider manually managing dependencies by installing specific versions of pandoc and zip-archive that are compatible with each other and with your project. You can do this using Cabal or Stack by specifying exact versions in your project's Cabal file or stack.yaml.

7. Haskell Extension Configuration: Check if there are any specific settings or configurations within the Haskell extension for VSCode that might affect dependency resolution. Make sure your VSCode extensions are up to date and compatible with your Haskell toolchain.

By following these steps and carefully examining the dependencies and their constraints, you should be able to resolve the dependency issues and get your Haskell project to build successfully in VSCode.

[alerque]

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