Enable Hoogle for local packages

It rebuilds GHC, but is worth it to have a Hoogle server.

Author: sellout

nix/README.md

@@ -31,6 +31,14 @@ and run `sudo nixos-rebuild switch` afterward.
 
 It is _not_ recommended to add your user to `trusted-users`. This _can_ make enabling flake configurations simpler (like the Unison Nix cache here), but [it is equivalent to giving that user root access (without need for sudo)](https://nix.dev/manual/nix/2.23/command-ref/conf-file.html#conf-trusted-users).
 
+## exploring the project
+
+``` bash
+nix develop --command hoogle server --local
+```
+
+will run a [Hoogle](github.com/ndmitchell/hoogle#readme) server at http://127.0.0.1:8080 with all of the Unison code & dependencies available.
+
 ## Building package components with nix
 
 ### Build the unison executable

nix/haskell-nix-flake.nix

@@ -92,18 +92,8 @@ in
     defaultPackage = haskell-nix-flake.packages."unison-cli-main:exe:unison";
 
     devShells = let
-      mkDevShell = pkg:
-        shellFor {
-          packages = _hpkgs: [pkg];
-          ## Enabling Hoogle causes us to rebuild GHC.
-          withHoogle = false;
-        };
+      mkDevShell = pkg: shellFor {packages = _hpkgs: [pkg];};
     in
-      {
-        local = shellFor {
-          packages = _hpkgs: builtins.attrValues localPackages;
-          withHoogle = false;
-        };
-      }
+      {local = shellFor {packages = _hpkgs: builtins.attrValues localPackages;};}
       // pkgs.lib.mapAttrs (_name: mkDevShell) localPackages;
   }