feat: show hierarchy of symbols in telescope picker

This is now enabled by default, but can be disabled by setting the
extension `show_nesting` option to false.

```lua
require('telescope').setup({
  extensions = {
    aerial = {
      show_nesting = false
    }
  }
})
```

README.md

@@ -468,7 +468,7 @@ The default bindings are set in
 [bindings.lua](https://github.com/stevearc/aerial.nvim/blob/master/lua/aerial/bindings.lua#L4),
 which you can use as a reference if you want to set your own bindings.
 
-| Key       | Command                                                        |
+| Key             | Command                                                        |
 | --------------- | -------------------------------------------------------------- |
 | `?`/`g?`        | Show default keymaps                                           |
 | `<CR>`          | Jump to the symbol under the cursor                            |
@@ -512,6 +512,19 @@ If you want the command to autocomplete, you can load the extension first:
 require('telescope').load_extension('aerial')
 ```
 
+The extension can be customized with the following options:
+
+```lua
+require('telescope').setup({
+  extensions = {
+    aerial = {
+      -- Display symbols as <root>.<parent>.<symbol>
+      show_nesting = true
+    }
+  }
+})
+```
+
 ### fzf
 
 If you have [fzf](https://github.com/junegunn/fzf.vim) installed you can trigger

lua/telescope/_extensions/aerial.lua

@@ -8,6 +8,10 @@ local finders = require("telescope.finders")
 local pickers = require("telescope.pickers")
 local telescope = require("telescope")
 
+local ext_config = {
+  show_nesting = true,
+}
+
 local function aerial_picker(opts)
   opts = opts or {}
   local bufnr = vim.api.nvim_get_current_buf()
@@ -37,17 +41,26 @@ local function aerial_picker(opts)
     text = vim.trim(text)
     local columns = {
       { icon, "Aerial" .. item.kind .. "Icon" },
-      { item.name, "Aerial" .. item.kind },
+      { entry.name, "Aerial" .. item.kind },
       text,
     }
     return displayer(columns)
   end
 
   local function make_entry(item)
+    local name = item.name
+    if ext_config.show_nesting then
+      local cur = item.parent
+      while cur do
+        name = string.format("%s.%s", cur.name, name)
+        cur = cur.parent
+      end
+    end
     return {
       value = item,
       display = make_display,
-      ordinal = item.name .. " " .. string.lower(item.kind),
+      name = name,
+      ordinal = name .. " " .. string.lower(item.kind),
       lnum = item.lnum,
       col = item.col + 1,
       filename = filename,
@@ -72,6 +85,9 @@ local function aerial_picker(opts)
 end
 
 return telescope.register_extension({
+  setup = function(user_config)
+    ext_config = vim.tbl_extend("force", ext_config, user_config or {})
+  end,
   exports = {
     aerial = aerial_picker,
   },