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
  • xmonad-contrib
  • xmonad
  • wai-app-static
  • warp
• Tags will be of the form unstable-<yyyy>-<mm>-<dd>-r<N> where any unversioned source is used.
• Tags will be of the form stable-<yyyy>-<mm>-<dd>-r<N> where all stable sources are used.

Updating the package set

The package set is generated from the horizon.dhall using the following command:

nix run 'git+https://gitlab.horizon-haskell.net/haskell/horizon-gen-nix?ref=refs/tags/0.9.0'

This will generate both the packages folder and the package set file. If you want to regenerate a particular package in the packages folder, delete that file from the packages folder. To regenerate the entire package set from scratch, delete the packages folder.

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

Programmmatic Updates

To use horizon-shell.

nix run 'git+https://gitlab.horizon-haskell.net/shells/horizon-shell?ref=refs/tags/0.0.3'

See the in-shell help for usage.