local zen browser pkg

modules/browsers.nix

@@ -7,7 +7,7 @@
     programs.firefox.enable = true;
 
     environment.systemPackages = [
-      inputs.zen-browser.packages.${pkgs.stdenv.hostPlatform.system}.default
+      self.packages.${pkgs.stdenv.hostPlatform.system}.zen-browser
       self.packages.${pkgs.stdenv.hostPlatform.system}.helium
     ];
   };

modules/pkgs/zen-browser.nix

@@ -0,0 +1,28 @@
+{ ... }: {
+  perSystem = { pkgs, ... }: {
+    packages.zen-browser = pkgs.appimageTools.wrapType2 rec {
+      pname = "zen-browser";
+      version = "1.19.1b";
+
+      src = pkgs.fetchurl {
+        url = "https://github.com/zen-browser/desktop/releases/download/${version}/zen-x86_64.AppImage";
+        hash = "sha256-h3lza2C+SxptpcX897Uf/nM8dNILUBXScSNQZlvSIQg=";
+      };
+
+      extraInstallCommands = let
+        contents = pkgs.appimageTools.extract { inherit pname version src; };
+      in ''
+        desktop_file=$(find ${contents} -name "*.desktop" | head -n1)
+        if [ -n "$desktop_file" ]; then
+          install -m 444 -D "$desktop_file" "$out/share/applications/${pname}.desktop"
+          substituteInPlace "$out/share/applications/${pname}.desktop" \
+            --replace 'Exec=AppRun' 'Exec=${pname}' || true
+        fi
+
+        if [ -d ${contents}/usr/share/icons ]; then
+          cp -r ${contents}/usr/share/icons $out/share
+        fi
+      '';
+    };
+  };
+}