Fix eval errors when i3 or sway null configs are null (#1989)

modules/services/window-managers/i3-sway/i3.nix

@@ -258,14 +258,14 @@ in {
         mkDefault (if (cfg.config.gaps != null) then pkgs.i3-gaps else pkgs.i3);
     })
 
-    {
+    (mkIf (cfg.config != null) {
       warnings = (optional (isList cfg.config.fonts)
         "Specifying i3.config.fonts as a list is deprecated. Use the attrset version instead.")
         ++ flatten (map (b:
           optional (isList b.fonts)
           "Specifying i3.config.bars[].fonts as a list is deprecated. Use the attrset version instead.")
           cfg.config.bars);
-    }
+    })
 
     (mkIf (cfg.config != null
       && (any (s: s.workspace != null) cfg.config.startup)) {

modules/services/window-managers/i3-sway/sway.nix

@@ -410,14 +410,17 @@ in {
     };
   };
 
-  config = mkIf cfg.enable {
+  config = mkIf cfg.enable (mkMerge [
+    (mkIf (cfg.config != null) {
       warnings = (optional (isList cfg.config.fonts)
         "Specifying sway.config.fonts as a list is deprecated. Use the attrset version instead.")
         ++ flatten (map (b:
           optional (isList b.fonts)
           "Specifying sway.config.bars[].fonts as a list is deprecated. Use the attrset version instead.")
           cfg.config.bars);
+    })
 
+    {
       home.packages = optional (cfg.package != null) cfg.package
         ++ optional cfg.xwayland pkgs.xwayland;
       xdg.configFile."sway/config" = {
@@ -439,5 +442,6 @@ in {
           After = [ "graphical-session-pre.target" ];
         };
       };
-  };
+    }
+  ]);
 }

tests/modules/services/window-managers/i3/default.nix

@@ -3,4 +3,5 @@
   i3-fonts = ./i3-fonts.nix;
   i3-fonts-deprecated = ./i3-fonts-deprecated.nix;
   i3-keybindings = ./i3-keybindings.nix;
+  i3-null-config = ./i3-null-config.nix;
 }

tests/modules/services/window-managers/i3/i3-fonts-deprecated.nix

@@ -13,17 +13,7 @@ with lib;
       };
     };
 
-    nixpkgs.overlays = [
+    nixpkgs.overlays = [ (import ./i3-overlay.nix) ];
-      (self: super: {
-        dmenu = super.dmenu // { outPath = "@dmenu@"; };
-
-        i3 = super.writeScriptBin "i3" "" // { outPath = "@i3@"; };
-
-        i3-gaps = super.writeScriptBin "i3" "" // { outPath = "@i3-gaps@"; };
-
-        i3status = super.i3status // { outPath = "@i3status@"; };
-      })
-    ];
 
     nmt.script = ''
       assertFileExists home-files/.config/i3/config

tests/modules/services/window-managers/i3/i3-fonts.nix

@@ -22,17 +22,7 @@ with lib;
       };
     };
 
-    nixpkgs.overlays = [
+    nixpkgs.overlays = [ (import ./i3-overlay.nix) ];
-      (self: super: {
-        dmenu = super.dmenu // { outPath = "@dmenu@"; };
-
-        i3 = super.writeScriptBin "i3" "" // { outPath = "@i3@"; };
-
-        i3-gaps = super.writeScriptBin "i3" "" // { outPath = "@i3-gaps@"; };
-
-        i3status = super.i3status // { outPath = "@i3status@"; };
-      })
-    ];
 
     nmt.script = ''
       assertFileExists home-files/.config/i3/config

tests/modules/services/window-managers/i3/i3-keybindings.nix

@@ -16,16 +16,7 @@ with lib;
         };
     };
 
-    nixpkgs.overlays = [
+    nixpkgs.overlays = [ (import ./i3-overlay.nix) ];
-      (self: super: {
-        dmenu = super.dmenu // { outPath = "@dmenu@"; };
-        i3 = super.writeScriptBin "i3" "" // { outPath = "@i3@"; };
-        i3-gaps = super.writeScriptBin "i3-gaps" "" // {
-          outPath = "@i3-gaps@";
-        };
-        i3status = super.i3status // { outPath = "@i3status@"; };
-      })
-    ];
 
     nmt.script = ''
       assertFileExists home-files/.config/i3/config

tests/modules/services/window-managers/i3/i3-null-config.nix

@@ -0,0 +1,20 @@
+{ config, lib, pkgs, ... }:
+
+with lib;
+
+{
+  config = {
+    xsession.windowManager.i3 = {
+      enable = true;
+      config = null;
+    };
+
+    nixpkgs.overlays = [ (import ./i3-overlay.nix) ];
+
+    nmt.script = ''
+      assertFileExists home-files/.config/i3/config
+      assertFileContent home-files/.config/i3/config \
+        ${pkgs.writeText "expected" "\n"}
+    '';
+  };
+}

tests/modules/services/window-managers/i3/i3-overlay.nix

@@ -0,0 +1,12 @@
+self: super:
+# Avoid unnecessary downloads in CI jobs and/or make out paths
+# constant, i.e., not containing hashes, version numbers etc.
+{
+  dmenu = super.dmenu // { outPath = "@dmenu@"; };
+
+  i3 = super.writeScriptBin "i3" "" // { outPath = "@i3@"; };
+
+  i3-gaps = super.writeScriptBin "i3" "" // { outPath = "@i3-gaps@"; };
+
+  i3status = super.i3status // { outPath = "@i3status@"; };
+}

tests/modules/services/window-managers/sway/default.nix

@@ -3,6 +3,7 @@
   sway-post-2003 = ./sway-post-2003.nix;
   sway-followmouse = ./sway-followmouse.nix;
   sway-followmouse-legacy = ./sway-followmouse-legacy.nix;
+  sway-null-config = ./sway-null-config.nix;
   sway-null-package = ./sway-null-package.nix;
   sway-modules = ./sway-modules.nix;
 }

tests/modules/services/window-managers/sway/sway-default.nix

@@ -15,17 +15,7 @@ in {
       config.menu = "${pkgs.dmenu}/bin/dmenu_run";
     };
 
-    nixpkgs.overlays = [
+    nixpkgs.overlays = [ (import ./sway-overlay.nix) ];
-      (self: super: {
-        dmenu = dummy-package // { outPath = "@dmenu@"; };
-        rxvt-unicode-unwrapped = dummy-package // {
-          outPath = "@rxvt-unicode-unwrapped@";
-        };
-        i3status = dummy-package // { outPath = "@i3status@"; };
-        sway = dummy-package // { outPath = "@sway@"; };
-        xwayland = dummy-package // { outPath = "@xwayland@"; };
-      })
-    ];
 
     nmt.script = ''
       assertFileExists home-files/.config/sway/config

tests/modules/services/window-managers/sway/sway-followmouse-legacy.nix

@@ -19,21 +19,7 @@ in {
       };
     };
 
-    nixpkgs.overlays = [
+    nixpkgs.overlays = [ (import ./sway-overlay.nix) ];
-      (self: super: {
-        dmenu = dummy-package // { outPath = "@dmenu@"; };
-        rxvt-unicode-unwrapped = dummy-package // {
-          outPath = "@rxvt-unicode-unwrapped@";
-        };
-        sway = dummy-package // { outPath = "@sway@"; };
-        sway-unwrapped = dummy-package // {
-          outPath = "@sway-unwrapped@";
-          version = "1";
-        };
-        swaybg = dummy-package // { outPath = "@swaybg@"; };
-        xwayland = dummy-package // { outPath = "@xwayland@"; };
-      })
-    ];
 
     nmt.script = ''
       assertFileExists home-files/.config/sway/config

tests/modules/services/window-managers/sway/sway-followmouse.nix

@@ -19,18 +19,7 @@ in {
       };
     };
 
-    nixpkgs.overlays = [
+    nixpkgs.overlays = [ (import ./sway-overlay.nix) ];
-      (self: super: {
-        dmenu = dummy-package // { outPath = "@dmenu@"; };
-        rxvt-unicode-unwrapped = dummy-package // {
-          outPath = "@rxvt-unicode-unwrapped@";
-        };
-        sway = dummy-package // { outPath = "@sway@"; };
-        sway-unwrapped = dummy-package // { version = "1"; };
-        swaybg = dummy-package // { outPath = "@swaybg@"; };
-        xwayland = dummy-package // { outPath = "@xwayland@"; };
-      })
-    ];
 
     nmt.script = ''
       assertFileExists home-files/.config/sway/config

tests/modules/services/window-managers/sway/sway-modules.nix

@@ -21,17 +21,7 @@ in {
       };
     };
 
-    nixpkgs.overlays = [
+    nixpkgs.overlays = [ (import ./sway-overlay.nix) ];
-      (self: super: {
-        dmenu = dummy-package // { outPath = "@dmenu@"; };
-        rxvt-unicode-unwrapped = dummy-package // {
-          outPath = "@rxvt-unicode-unwrapped@";
-        };
-        i3status = dummy-package // { outPath = "@i3status@"; };
-        sway = dummy-package // { outPath = "@sway@"; };
-        xwayland = dummy-package // { outPath = "@xwayland@"; };
-      })
-    ];
 
     nmt.script = ''
       assertFileExists home-files/.config/sway/config

tests/modules/services/window-managers/sway/sway-null-config.nix

@@ -0,0 +1,22 @@
+{ config, lib, pkgs, ... }:
+
+with lib;
+
+{
+  config = {
+    wayland.windowManager.sway = {
+      enable = true;
+      config = null;
+      systemdIntegration = false;
+      package = pkgs.sway;
+    };
+
+    nixpkgs.overlays = [ (import ./sway-overlay.nix) ];
+
+    nmt.script = ''
+      assertFileExists home-files/.config/sway/config
+      assertFileContent home-files/.config/sway/config \
+        ${pkgs.writeText "expected" "\n"}
+    '';
+  };
+}

tests/modules/services/window-managers/sway/sway-null-package.nix

@@ -17,17 +17,7 @@ in {
       config.menu = "${pkgs.dmenu}/bin/dmenu_run";
     };
 
-    nixpkgs.overlays = [
+    nixpkgs.overlays = [ (import ./sway-overlay.nix) ];
-      (self: super: {
-        dmenu = dummy-package // { outPath = "@dmenu@"; };
-        rxvt-unicode-unwrapped = dummy-package // {
-          outPath = "@rxvt-unicode-unwrapped@";
-        };
-        i3status = dummy-package // { outPath = "@i3status@"; };
-        sway = dummy-package // { outPath = "@sway@"; };
-        xwayland = dummy-package // { outPath = "@xwayland@"; };
-      })
-    ];
 
     assertions = [{
       assertion =

tests/modules/services/window-managers/sway/sway-overlay.nix

@@ -0,0 +1,17 @@
+self: super:
+# Avoid unnecessary downloads in CI jobs.
+let dummy-package = super.runCommandLocal "dummy-package" { } "mkdir $out";
+in {
+  dmenu = dummy-package // { outPath = "@dmenu@"; };
+  rxvt-unicode-unwrapped = dummy-package // {
+    outPath = "@rxvt-unicode-unwrapped@";
+  };
+  i3status = dummy-package // { outPath = "@i3status@"; };
+  sway = dummy-package // { outPath = "@sway@"; };
+  sway-unwrapped = dummy-package // {
+    outPath = "@sway-unwrapped@";
+    version = "1";
+  };
+  swaybg = dummy-package // { outPath = "@swaybg@"; };
+  xwayland = dummy-package // { outPath = "@xwayland@"; };
+}

tests/modules/services/window-managers/sway/sway-post-2003.nix

@@ -17,17 +17,7 @@ in {
       config.menu = "${pkgs.dmenu}/bin/dmenu_run";
     };
 
-    nixpkgs.overlays = [
+    nixpkgs.overlays = [ (import ./sway-overlay.nix) ];
-      (self: super: {
-        dmenu = dummy-package // { outPath = "@dmenu@"; };
-        rxvt-unicode-unwrapped = dummy-package // {
-          outPath = "@rxvt-unicode-unwrapped@";
-        };
-        sway = dummy-package // { outPath = "@sway@"; };
-        i3status = dummy-package // { outPath = "@i3status@"; };
-        xwayland = dummy-package // { outPath = "@xwayland@"; };
-      })
-    ];
 
     nmt.script = ''
       assertFileExists home-files/.config/sway/config