plugins/harpoon: allow to enable the telescope extension (#624)

plugins/utils/harpoon.nix

@@ -27,6 +27,8 @@ in {
 
       package = helpers.mkPackageOption "harpoon" pkgs.vimPlugins.harpoon;
 
+      enableTelescope = mkEnableOption "Enable telescope integration";
+
       keymapsSilent = mkOption {
         type = types.bool;
         description = "Whether harpoon keymaps should be silent.";
@@ -198,10 +200,24 @@ in {
       // cfg.extraOptions;
   in
     mkIf cfg.enable {
+      assertions = [
+        {
+          assertion = config.plugins.telescope.enable -> cfg.enableTelescope;
+          message = ''Nixvim: The harpoon telescope integration needs telescope to function as intended'';
+        }
+      ];
+
       extraPlugins = [cfg.package];
 
-      extraConfigLua = ''
+      extraConfigLua = let
+        telescopeCfg = ''require("telescope").load_extension("harpoon")'';
+      in ''
         require('harpoon').setup(${helpers.toLuaObject setupOptions})
+        ${
+          if cfg.enableTelescope
+          then telescopeCfg
+          else ""
+        }
       '';
 
       keymaps = let

tests/test-sources/plugins/utils/harpoon.nix

@@ -7,14 +7,19 @@
     plugins.harpoon.enable = true;
   };
 
-  example = {
+  telescopeEnabled = {
     # Harpoon expects to access `~/.local/share/nvim/harpoon.json` which is not available in the
     # test environment
     tests.dontRun = true;
 
+    plugins.telescope = {
+      enable = true;
+    };
+
     plugins.harpoon = {
       enable = true;
 
+      enableTelescope = true;
       keymapsSilent = true;
       keymaps = {
         addFile = "<leader>a";
@@ -59,4 +64,16 @@
       };
     };
   };
+
+  telescopeDisabled = {
+    # Harpoon expects to access `~/.local/share/nvim/harpoon.json` which is not available in the
+    # test environment
+    tests.dontRun = true;
+
+    plugins.harpoon = {
+      enable = true;
+
+      enableTelescope = false;
+    };
+  };
 }