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+;; jao-doc-view-imenu.el --- old docview/imenu  -*- lexical-binding: t; -*-
+
+;; Copyright (C) 2022  jao
+
+;; Author: jao <mail@jao.io>
+;; Keywords:
+
+;; This program is free software; you can redistribute it and/or modify
+;; it under the terms of the GNU General Public License as published by
+;; the Free Software Foundation, either version 3 of the License, or
+;; (at your option) any later version.
+
+;; This program is distributed in the hope that it will be useful,
+;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;; GNU General Public License for more details.
+
+;; You should have received a copy of the GNU General Public License
+;; along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+;;; Commentary:
+
+;; Old code that made its way into emacs 29.  It defines imenu entries for
+;; docview.
+
+;;; Code:
+
+(defvar jao-pdf--outline-rx
+  "[^\t]+\\(\t+\\)\"\\(.+\\)\"\t#\\(?:page=\\)?\\([0-9]+\\)")
+
+(defun jao-pdf-outline (&optional file-name)
+  "Return an alist describing the given FILE-NAME (or current if nil).
+The result is cached as a local buffer variable."
+  (let* ((outline nil)
+         (fn (or file-name (buffer-file-name)))
+         (fn (shell-quote-argument (expand-file-name fn))))
+    (with-temp-buffer
+      (insert (shell-command-to-string (format "mutool show %s outline" fn)))
+      (goto-char (point-min))
+      (while (re-search-forward jao-pdf--outline-rx nil t)
+        (push `((level . ,(length (match-string 1)))
+                (title . ,(match-string 2))
+                (page . ,(string-to-number (match-string 3))))
+              outline)))
+    (setq jao-pdf--outline (nreverse outline))))
+
+(defun jao-pdf-imenu--index (items act)
+  (let ((level (alist-get 'level (car items)))
+        (index nil))
+    (while (and (car items) (<= level (alist-get 'level (car items))))
+      (let-alist (car items)
+        (let ((title (format "%s%s (%s)" "" .title .page)))
+          (if (> .level level)
+              (let ((sub (jao-pdf-imenu--index items act))
+                    (fst (car index)))
+                (setq index (cdr index))
+                (push (cons (car fst) (cons fst (car sub))) index)
+                (setq items (cdr sub)))
+            (push `(,title 0 ,act ,.page) index)
+            (setq items (cdr items))))))
+    (cons (nreverse index) items)))
+
+(defun jao-pdf-imenu-index (&optional goto-page-fn file-name)
+  "Create an imenu index using `jao-pdf-outline'."
+  (let* ((goto (or goto-page-fn 'doc-view-goto-page))
+         (act (lambda (_name _pos page) (funcall goto page)))
+         (items (jao-pdf-outline file-name)))
+    (car (jao-pdf-imenu--index items act))))
+
+(defun jao-pdf-set-up-imenu ()
+  (setq-local imenu-create-index-function #'jao-pdf-imenu-index
+              imenu-submenus-on-top nil
+              imenu-sort-function nil)
+  (imenu-add-to-menubar "Outline"))