Use InstalledPackageInfo in readGhcPkg

flake.nix

@@ -0,0 +1,38 @@
+{
+  inputs = {
+    flake-utils.url = "github:numtide/flake-utils";
+    hdeps = {
+      url = "github:LightAndLight/hdeps";
+      inputs.flake-utils.follows = "flake-utils";
+    };
+  };
+  outputs = { self, nixpkgs, flake-utils, hdeps }:
+    {
+      overlays.default = final: prev: {
+        haskellPackages =
+          (prev.haskellPackages.extend (import ./nix/generated/overlay.nix)).extend (hfinal: hprev: {
+            hoogle = prev.haskell.lib.dontHaddock (hprev.callPackage ./hoogle.nix {});
+          });
+      };
+    } //
+    flake-utils.lib.eachDefaultSystem (system:
+      let 
+        pkgs = import nixpkgs { inherit system; };
+      in {
+        devShell = pkgs.mkShell {
+          buildInputs = with pkgs; [
+            # C
+            clang-tools clang gdb
+
+            # Haskell
+            ghc cabal-install haskell-language-server
+
+            # Project
+            just haskellPackages.fourmolu cabal2nix hdeps.packages.${system}.default haskellPackages.implicit-hie
+
+            zlib
+          ];
+        };
+      }
+    );
+}

hoogle.cabal

@@ -1,7 +1,7 @@
 cabal-version:      1.18
 build-type:         Simple
 name:               hoogle
-version:            5.0.19.0
+version:            5.0.20.0
 license:            BSD3
 license-file:       LICENSE
 category:           Development

hoogle.nix

@@ -0,0 +1,34 @@
+{ mkDerivation, aeson, ansi-terminal, base, binary, blaze-html
+, blaze-markup, bytestring, Cabal-syntax, cmdargs, conduit
+, conduit-extra, containers, crypton-connection, data-default-class
+, deepseq, directory, extra, filepath, ghc-lib-parser
+, hackage-revdeps, hashable, haskell-src-exts, http-conduit
+, http-types, js-flot, js-jquery, lib, mmap, old-locale
+, process-extras, QuickCheck, resourcet, safe, storable-tuple, tar
+, template-haskell, temporary, text, time, transformers, uniplate
+, utf8-string, vector, wai, wai-logger, warp, warp-tls, zlib
+}:
+mkDerivation {
+  pname = "hoogle";
+  version = "5.0.20.0";
+  src = ./.;
+  isLibrary = true;
+  isExecutable = true;
+  enableSeparateDataOutput = true;
+  libraryHaskellDepends = [
+    aeson ansi-terminal base binary blaze-html blaze-markup bytestring
+    Cabal-syntax cmdargs conduit conduit-extra containers
+    crypton-connection data-default-class deepseq directory extra
+    filepath ghc-lib-parser hackage-revdeps hashable haskell-src-exts
+    http-conduit http-types js-flot js-jquery mmap old-locale
+    process-extras QuickCheck resourcet safe storable-tuple tar
+    template-haskell temporary text time transformers uniplate
+    utf8-string vector wai wai-logger warp warp-tls zlib
+  ];
+  executableHaskellDepends = [ base ];
+  testFlags = [ "--no-net" ];
+  homepage = "https://hoogle.haskell.org/";
+  description = "Haskell API Search";
+  license = lib.licenses.bsd3;
+  mainProgram = "hoogle";
+}

nix/generated/hackage-revdeps/default.nix

@@ -0,0 +1,21 @@
+{ mkDerivation, alfred-margaret, ansi-terminal, base, bytestring
+, Cabal, cabal-install, Cabal-syntax, callPackage, containers
+, filepath, lib, optparse-applicative, tar, text, time, zlib
+}:
+mkDerivation {
+  pname = "hackage-revdeps";
+  version = "0.3";
+  src = callPackage ./src.nix {};
+  isLibrary = true;
+  isExecutable = true;
+  libraryHaskellDepends = [
+    alfred-margaret base bytestring Cabal-syntax containers filepath
+    tar text time zlib
+  ];
+  executableHaskellDepends = [
+    ansi-terminal base Cabal cabal-install Cabal-syntax containers
+    filepath optparse-applicative time
+  ];
+  description = "List Hackage reverse dependencies";
+  license = lib.licenses.bsd3;
+}

nix/generated/hackage-revdeps/src.nix

@@ -0,0 +1,5 @@
+{ fetchzip }:
+fetchzip {
+  url = "https://hackage.haskell.org/package/hackage-revdeps/hackage-revdeps-0.3.tar.gz";
+  sha256 = "1v4b7nb36hcz0wvi3qvrchzp09h26pbfky80m4m8yp4mnmg9wzrg";
+}

nix/generated/overlay.nix

@@ -0,0 +1,3 @@
+self: super: {
+  hackage-revdeps = self.callPackage ./hackage-revdeps {};
+}

nix/hdeps.json

@@ -0,0 +1,6 @@
+{
+  "hackage-revdeps": {
+    "type": "hackage",
+    "version": "0.3"
+  }
+}