daml/hazel/README.md

Hazel Configuration

The file packages.bzl in this directory lists all packages available in the chosen Stackage snapshot.

Update the Stackage snapshot

To update the Stackage snapshot you need to clone the hazel repository into a separate directory:

$ git clone https://github.com/FormationAI/hazel.git

Change into the hazel repository root directory.

$ cd hazel

Then execute the following command to update to the specified Stackage snapshot, where $PROJECT points to the root of this repository: (Requires stack)

$ Stackage.hs lts-12.4 "$PROJECT/hazel/packages.bzl"

On NixOS you may need to modify Stackage.hs to append the following flag to the list of stack intrepreter flags: --nix-packages zlib.

This will take a while.