Inside nvim.

return {
   "sindrets/diffview.nvim",

   cmd = { "DiffviewOpen", "DiffviewFileHistory" },
   keys = {
      { "<Leader>gd", "<cmd>DiffviewFileHistory %<CR>", desc = "Diff File" },
      { "<Leader>gv", "<cmd>DiffviewOpen<CR>", desc = "Diff View" },
   },

   opts = function()
      local actions = require("diffview.actions")
      vim.api.nvim_create_autocmd({ "WinEnter", "BufEnter" }, {
         group = vim.api.nvim_create_augroup("rafi_diffview", {}),
         pattern = "diffview:///panels/*",
         callback = function()
            vim.opt_local.cursorline = true
            vim.opt_local.winhighlight = "CursorLine:WildMenu"
         end,
      })

      return {
         enhanced_diff_hl = true, -- See ':h diffview-config-enhanced_diff_hl'
         keymaps = {
            view = {
               { "n", "q", actions.close },
               { "n", "<Tab>", actions.select_next_entry },
               { "n", "<S-Tab>", actions.select_prev_entry },
               { "n", "<LocalLeader>a", actions.focus_files },
               { "n", "<LocalLeader>e", actions.toggle_files },
            },
            file_panel = {
               { "n", "q", actions.close },
               { "n", "h", actions.prev_entry },
               { "n", "o", actions.focus_entry },
               { "n", "gf", actions.goto_file },
               { "n", "sg", actions.goto_file_split },
               { "n", "st", actions.goto_file_tab },
               { "n", "<C-r>", actions.refresh_files },
               { "n", "<LocalLeader>e", actions.toggle_files },
            },
            file_history_panel = {
               { "n", "q", "<cmd>DiffviewClose<CR>" },
               { "n", "o", actions.focus_entry },
               { "n", "O", actions.options },
            },
         },
      }
   end,
}