Horizon Haskell Platform

horizon-haskell.net.

Horizon is a haskell package set targetting new builds of GHC.

Package Set Policy

This package set has the following policy.

• GHC will advance as often as possible
• Nonversioned locations (git, unversioned tarballs) are permitted to allow GHC to advance.
• The following packages must always build:
  • aeson
  • beam-postgres
  • composite-base
  • dhall
  • haskell-language-server
  • hedgehog
  • pandoc
  • persistent-postgresql
  • polysemy
  • servant
  • sydtest
  • tasty
  • wai-app-static
  • warp

Updating the package set

The package set is generated from the horizon.dhall. You can edit this in one of two ways: manually using a text edit, or programatically using horizon-shell.

Manual

Edit the horizon.dhall file and add or change some package data.

Run horizon-gen-nix from the remote repository.

nix run 'git+https://gitlab.horizon-haskell.net/haskell/horizon-gen-nix?ref=refs/tags/0.10.0'

Programatic

To use horizon-shell.

nix develop

See the in-shell help for usage.

Tweaking

If you need to do additional manual overrides to the nix code, such as addPkgconfigDepends, edit the configuration/common.nix overlay, which is applied last.