more progress on custom options config

modules/features/applications/gui/fluxer.nix

@@ -0,0 +1,78 @@
+{ inputs, self, ... }: {
+  flake.nixosModules.graphics = { pkgs, config, lib, ... }: {
+    options.features.applications.gui = {
+      fluxer.enable = lib.mkEnableOption "fluxer";
+      fluxer-canary.enable = lib.mkEnableOption "fluxer-canary";
+    };
+
+    config = {
+      environment.systemPackages = (if config.features.applications.gui.fluxer.enable then [
+        (pkgs.callPackage ({ appimageTools, fetchurl, lib, pkgs, ... }:
+        let
+          pname = "fluxer";
+          version = "0.0.8";
+
+          src = fetchurl {
+            url = "https://api.fluxer.app/dl/desktop/stable/linux/x64/latest/appimage";
+            sha256 = "sha256-GdoBK+Z/d2quEIY8INM4IQy5tzzIBBM+3CgJXQn0qAw=";
+          };
+
+          appimageContents = appimageTools.extract { inherit pname version src; };
+        in
+        appimageTools.wrapType2 rec {
+          inherit pname version src;
+
+          extraInstallCommands = ''
+            install -m 444 -D ${appimageContents}/${pname}.desktop $out/share/applications/${pname}.desktop
+
+            install -m 444 -D ${appimageContents}/${pname}.png $out/share/icons/hicolor/512x512/apps/${pname}.png
+
+            substituteInPlace $out/share/applications/${pname}.desktop \
+              --replace 'Exec=AppRun --no-sandbox %U' 'Exec=${pname} %U'
+          '';
+
+          meta = with lib; {
+            description = "Open-source, self-hosted alternative to Discord";
+            homepage = "https://fluxer.app/";
+            license = licenses.agpl3Only;
+            maintainers = [ ];
+            platforms = [ "x86_64-linux" ];
+          };
+        }) {})
+      ] else []) ++ (if config.features.applications.gui.fluxer-canary.enable then [
+        (pkgs.callPackage ({ appimageTools, fetchurl, lib, pkgs, ... }:
+        let
+          pname = "fluxer-canary";
+          version = "2026.827.132039";
+
+          src = fetchurl {
+            url = "https://api.canary.fluxer.app/dl/desktop/canary/linux/x64/latest/appimage";
+            sha256 = "sha256-eRR9JZa4LPuUtjdDO+JvzaOLxQeDgVziLrFr5iIgr1Q=";
+          };
+
+          appimageContents = appimageTools.extract { inherit pname version src; };
+        in
+        appimageTools.wrapType2 rec {
+          inherit pname version src;
+
+          extraInstallCommands = ''
+            install -m 444 -D ${appimageContents}/${pname}.desktop $out/share/applications/${pname}.desktop
+
+            install -m 444 -D ${appimageContents}/${pname}.png $out/share/icons/hicolor/512x512/apps/${pname}.png
+
+            substituteInPlace $out/share/applications/${pname}.desktop \
+              --replace 'Exec=AppRun %U' 'Exec=${pname} %U'
+          '';
+
+          meta = with lib; {
+            description = "Open-source, self-hosted alternative to Discord";
+            homepage = "https://fluxer.app/";
+            license = licenses.agpl3Only;
+            maintainers = [ ];
+            platforms = [ "x86_64-linux" ];
+          };
+        }) {})
+      ] else []);
+    };
+  };
+}