doc: add recipe to show current directory in the winbar

doc/recipes.md

@@ -30,6 +30,27 @@ require("oil").setup({
 })
 ```
 
+## Show CWD in the winbar
+
+```lua
+-- Declare a global function to retrieve the current directory
+function _G.get_oil_winbar()
+  local dir = require("oil").get_current_dir()
+  if dir then
+    return vim.fn.fnamemodify(dir, ":~")
+  else
+    -- If there is no current directory (e.g. over ssh), just show the buffer name
+    return vim.api.nvim_buf_get_name(0)
+  end
+end
+
+require("oil").setup({
+  win_options = {
+    winbar = "%!v:lua.get_oil_winbar()",
+  },
+})
+```
+
 ## Hide gitignored files and show git tracked hidden files
 
 ```lua
@@ -88,7 +109,9 @@ require("oil").setup({
       local dir = require("oil").get_current_dir(bufnr)
       local is_dotfile = vim.startswith(name, ".") and name ~= ".."
       -- if no local directory (e.g. for ssh connections), just hide dotfiles
-      if not dir then return is_dotfile end
+      if not dir then
+        return is_dotfile
+      end
       -- dotfiles are considered hidden unless tracked
       if is_dotfile then
         return not git_status[dir].tracked[name]