add directory name to Oil winbar

lua/custom/plugins/oil.lua

@@ -12,6 +12,16 @@ return {
       { "mtime",       highlight = "Whitespace", format = "%Y-%m-%d %T" },
     }
 
+    function _G.get_oil_winbar()
+      local bufnr = vim.api.nvim_win_get_buf(vim.g.statusline_winid)
+      local dir = oil.get_current_dir(bufnr)
+      if dir then
+        return vim.fn.fnamemodify(dir, ":~")
+      else
+        return vim.api.nvim_buf_get_name(0)
+      end
+    end
+
     oil.setup {
       default_file_explorer = true,
       watch_for_changes = false,
@@ -36,6 +46,9 @@ return {
       view_options = {
         show_hidden = true,
       },
+      win_options = {
+        winbar = "%!v:lua.get_oil_winbar()",
+      },
     }
 
     vim.keymap.set("n", "-", oil.open)