nixos/keyd: add extraConfig option

nixos/modules/services/hardware/keyd.nix

@@ -2,7 +2,6 @@
 with lib;
 let
   cfg = config.services.keyd;
-  settingsFormat = pkgs.formats.ini { };
 
   keyboardOptions = { ... }: {
     options = {
@@ -16,7 +15,7 @@ let
       };
 
       settings = mkOption {
-        type = settingsFormat.type;
+        type = (pkgs.formats.ini { }).type;
         default = { };
         example = {
           main = {
@@ -37,6 +36,20 @@ let
           See <https://github.com/rvaiya/keyd> how to configure.
         '';
       };
+
+      extraConfig = mkOption {
+        type = types.lines;
+        default = "";
+        example = ''
+          [control+shift]
+          h = left
+        '';
+        description = lib.mdDoc ''
+          Extra configuration that is appended to the end of the file.
+          **Do not** write `ids` section here, use a separate option for it.
+          You can use this option to define compound layers that must always be defined after the layer they are comprised.
+        '';
+      };
     };
   };
 in
@@ -85,15 +98,12 @@ in
     environment.etc = mapAttrs'
       (name: options:
         nameValuePair "keyd/${name}.conf" {
-          source = pkgs.runCommand "${name}.conf"
-            {
-              ids = ''
-                [ids]
-                ${concatStringsSep "\n" options.ids}
-              '';
-              passAsFile = [ "ids" ];
-            } ''
-            cat $idsPath <(echo) ${settingsFormat.generate "keyd-${name}.conf" options.settings} >$out
+          text = ''
+            [ids]
+            ${concatStringsSep "\n" options.ids}
+
+            ${generators.toINI {} options.settings}
+            ${options.extraConfig}
           '';
         })
       cfg.keyboards;

nixos/tests/keyd.nix

@@ -26,13 +26,13 @@ let
   '';
 
 
-  mkKeyboardTest = name: { settings, test }: with pkgs.lib; makeTest {
+  mkKeyboardTest = name: { default, test }: with pkgs.lib; makeTest {
     inherit name;
 
     nodes.machine = {
       services.keyd = {
         enable = true;
-        keyboards.default = { inherit settings; };
+        keyboards = { inherit default; };
       };
     };
 
@@ -70,13 +70,20 @@ let
 in
 pkgs.lib.mapAttrs mkKeyboardTest {
   swap-ab_and_ctrl-as-shift = {
-    test.press = [ "a" "ctrl-b" "c" ];
-    test.expect = [ "b" "A" "c" ];
+    test.press = [ "a" "ctrl-b" "c" "alt_r-h" ];
+    test.expect = [ "b" "A" "c" "q" ];
 
-    settings.main = {
-      "a" = "b";
-      "b" = "a";
-      "control" = "oneshot(shift)";
+    default = {
+      settings.main = {
+        "a" = "b";
+        "b" = "a";
+        "control" = "oneshot(shift)";
+        "rightalt" = "layer(rightalt)";
+      };
+      extraConfig = ''
+        [rightalt:G]
+        h = q
+      '';
     };
   };
 }