Add diffview

lua/custom/plugins/diffview.lua

@@ -0,0 +1,16 @@
+return {
+  'sindrets/diffview.nvim',
+  cmd = { 'DiffviewOpen', 'DiffviewClose', 'DiffviewToggleFiles', 'DiffviewFocusFiles' },
+  opts = {},
+  keys = { { '<leader>gd', '<cmd>DiffviewOpen<cr>', desc = 'DiffView' } },
+  config = function()
+    require('diffview').setup()
+    vim.keymap.set('n', '<leader>gd', function()
+      if next(require('diffview.lib').views) == nil then
+        vim.cmd 'DiffviewOpen'
+      else
+        vim.cmd 'DiffviewClose'
+      end
+    end)
+  end,
+}