fix(git): degrade gracefully without 'nvim'

home/modules/git/default.nix

@@ -70,19 +70,16 @@ in
       };
     }
     // {
-      assertions = [
-        {
-          assertion = config.nvim.enable;
-          message = "git module requires 'nvim' module (`nvimdiff`)";
-        }
-      ];
+      warnings = lib.optional (
+        !config.nvim.enable
+      ) "'git.enable' is enabled without 'nvim.enable' (not using 'nvimdiff')";
 
       xdg.configFile."git/ignore".source = ./global.gitignore;
 
       programs.git = {
         enable = true;
-        settings = {
-          core.editor = "nvim";
+        settings = lib.mkMerge [
+          {
             user = {
               name = "Hektor Misplon";
               username = "hektor";
@@ -146,24 +143,24 @@ in
               date = "relative";
               abbrevCommit = true;
             };
-          merge = {
-            tool = "nvimdiff";
-            conflictStyle = "diff3";
-          };
-          diff = {
-            colorMoved = "zebra";
-            tool = "nvimdiff";
-          };
+            merge.conflictStyle = "diff3";
+            diff.colorMoved = "zebra";
+            commit.gpgSign = false;
+            interactive.singleKey = true;
+            pull.rebase = true;
+            rerere.enabled = true;
+          }
+          (lib.mkIf config.nvim.enable {
+            core.editor = "nvim";
+            diff.tool = "nvimdiff";
+            merge.tool = "nvimdiff";
             difftool.prompt = false;
             mergetool = {
               prompt = false;
               keepBackup = false;
             };
-          commit.gpgSign = false;
-          interactive.singleKey = true;
-          pull.rebase = true;
-          rerere.enabled = true;
-        };
+          })
+        ];
 
         includes = [
           { path = personalEmail; }