Using Rhyolite with an Obelisk project

1. Within an already initialized Obelisk project, clone Rhyolite into the dep directory, if you haven’t already:

git clone https://github.com/obsidiansystems/rhyolite dep/rhyolite

1. Add Rhyolite’s haskellOverrides to default.nix so that your package can access them. This involves adding overrides to the arguments passed to Obelisk’s project function so that it imports Rhyolite’s haskellOverrides. You can base it off of this example:

{ system ? builtins.currentSystem # TODO: Get rid of this system cruft
, iosSdkVersion ? "10.2"
}:
with import ./.obelisk/impl { inherit system iosSdkVersion; };
project ./. ({ pkgs, hackGet, ... }@args: {

  overrides = pkgs.lib.composeExtensions (import (hackGet ./dep/rhyolite) args).haskellOverrides
    (self: super: with pkgs.haskell.lib; {
      # Your custom overrides go here.
    });

  android.applicationId = "systems.obsidian.obelisk.examples.minimal";
  android.displayName = "Obelisk Minimal Example";
  ios.bundleIdentifier = "systems.obsidian.obelisk.examples.minimal";
  ios.bundleName = "Obelisk Minimal Example";
})

1. You can now add any of Rhyolite’s packages as dependencies to your Obelisk project. Here is the full list of packages provided:

   • rhyolite-aeson-orphans
   • rhyolite-backend
   • rhyolite-backend-db
   • rhyolite-backend-snap
   • rhyolite-common
   • rhyolite-datastructures
   • rhyolite-frontend

Alternative method

You can also let Rhyolite manage Obelisk directly. This is easier to setup but also means that you are stuck with the Obelisk version used by Rhyolite.

To do this, simply overwrite the .obelisk/impl/github.json file with this Rhyolite thunk:

{
  "owner": "obsidiansystems",
  "repo": "rhyolite",
  "branch": "master",
  "rev": "06b9851a101408a86a4ec0b7df5b2f71bc532ab0",
  "sha256": "18adbc1nnj94qhggpcxmpd5i1rz0zx93cpphl09mw4c7s65rzah7"
}

Hacking

On backend

nix-shell -A proj.shells.ghc --run 'cabal new-repl lib:rhyolite-backend'

On frontend

nix-shell -A proj.shells.ghc --run 'cabal new-repl lib:rhyolite-frontend'