mergiraf: add jujutsu integration

modules/programs/mergiraf.nix

@@ -27,17 +27,21 @@ in
   config = mkIf cfg.enable {
     home.packages = [ cfg.package ];
 
-    programs.git = {
-      attributes = [ "* merge=mergiraf" ];
-      settings = {
-        merge = {
-          mergiraf = {
-            name = "mergiraf";
-            driver = "${mergiraf} merge --git %O %A %B -s %S -x %X -y %Y -p %P -l %L";
+    programs = {
+      git = {
+        attributes = [ "* merge=mergiraf" ];
+        settings = {
+          merge = {
+            mergiraf = {
+              name = "mergiraf";
+              driver = "${mergiraf} merge --git %O %A %B -s %S -x %X -y %Y -p %P -l %L";
+            };
+            conflictStyle = "diff3";
           };
-          conflictStyle = "diff3";
         };
       };
+
+      jujutsu.settings.ui.merge-editor = "mergiraf";
     };
   };
 }

tests/modules/programs/mergiraf/default.nix

@@ -1 +1,4 @@
-{ mergiraf-basic-configuration = ./basic-configuration.nix; }
+{
+  mergiraf-basic-configuration = ./basic-configuration.nix;
+  mergiraf-jujutsu-integration = ./jujutsu-integration.nix;
+}

tests/modules/programs/mergiraf/jujutsu-integration.nix

@@ -0,0 +1,33 @@
+{
+  config,
+  lib,
+  pkgs,
+  ...
+}:
+let
+  cfg = config.programs.jujutsu;
+  packageVersion = lib.getVersion cfg.package;
+
+  # jj v0.29+ deprecated support for "~/Library/Application Support" on Darwin.
+  configDir =
+    if pkgs.stdenv.isDarwin && !(lib.versionAtLeast packageVersion "0.29.0") then
+      "Library/Application Support"
+    else
+      ".config";
+in
+{
+  programs.jujutsu = {
+    enable = true;
+    package = config.lib.test.mkStubPackage { };
+  };
+  programs.mergiraf.enable = true;
+
+  nmt.script = ''
+    assertFileExists 'home-files/${configDir}/jj/config.toml'
+    assertFileContent 'home-files/${configDir}/jj/config.toml' \
+      ${builtins.toFile "expected.toml" ''
+        [ui]
+        merge-editor = "mergiraf"
+      ''}
+  '';
+}