Update nixvim keymaps and harpoon plugin

- Add indentation and line movement keymaps in visual mode
- Add keymap for adding files in harpoon plugin

home/common/core/nixvim/keymaps.nix

@@ -1,13 +1,11 @@
 {
-  programs.nixvim.keymaps = [
+programs.nixvim.keymaps = [
     # Switching buffers
     {
       mode = ["n"];
       action = "<C-w>h";
       key = "<S-h>";
-      options = {
-        silent = true;
-      };
+      options = {silent = true;};
     }
     {
       mode = ["n"];
@@ -113,5 +111,33 @@
       action = ": resize +1<CR>";
       options = {noremap = true;};
     }
+
+    # indent line in or out
+    {
+      mode = ["v"];
+      key = "<";
+      action = "<gv";
+      options = {noremap = true;};
+    }
+    {
+      mode = ["v"];
+      key = ">";
+      action = ">gv";
+      options = {noremap = true;};
+    }
+
+    # move selected line up or down
+    {
+      mode = ["v"];
+      key = "J";
+      action = ":m '>+1<CR>gv=gv";
+      options = {noremap = true;};
+    }
+    {
+      mode = ["v"];
+      key = "K";
+      action = ":m '<-2<CR>gv=gv";
+      options = {noremap = true;};
+    }
   ];
 }

home/common/core/nixvim/plugins/harpoon.nix

@@ -3,6 +3,7 @@
     enable = true;
     keymaps = {
       toggleQuickMenu = "<leader>h";
+      addFile = "<leader>a";
     };
   };
 }