From d26b9612b863553148562ea72398a472fe04adf9 Mon Sep 17 00:00:00 2001
From: Alan Pearce
Date: Tue, 22 Dec 2015 16:45:20 +0100
Subject: Override imenu with nested version

---
 tag-emacs/emacs.d/init.org | 24 +++++++++++++++++++++++-
 1 file changed, 23 insertions(+), 1 deletion(-)

diff --git a/tag-emacs/emacs.d/init.org b/tag-emacs/emacs.d/init.org
index a25c615..6c3b9a3 100644
--- a/tag-emacs/emacs.d/init.org
+++ b/tag-emacs/emacs.d/init.org
@@ -1165,12 +1165,34 @@ replace helm and ido.
     :bind (("C-s" . swiper)
            ("C-r" . swiper)
            ("C-c C-r" . ivy-resume)
-           ("C-x i" . imenu)
+           ("C-x i" . ivy-imenu-goto)
            ("C-=" . swiper))
     :config (progn
               (setq ivy-use-virtual-buffers t
                     ivy-re-builders-alist '((internal-complete-buffer . ivy--regex-fuzzy)
                                             (t . ivy--regex-plus)))
+              (defun ivy-imenu-get-candidates-from (alist  &optional prefix)
+                (cl-loop for elm in alist
+                         nconc (if (imenu--subalist-p elm)
+                                   (ivy-imenu-get-candidates-from
+                                    (cl-loop for (e . v) in (cdr elm) collect
+                                             (cons e (if (integerp v) (copy-marker v) v)))
+                                    (concat prefix (if prefix ".") (car elm)))
+                                 (and (cdr elm) ; bug in imenu, should not be needed.
+                                      (setcdr elm (copy-marker (cdr elm))) ; Same as [1].
+                                      (list (cons (concat prefix (if prefix ".") (car elm))
+                                                  (copy-marker (cdr elm))))))))
+
+              (defun ivy-imenu-goto ()
+                "Go to buffer position"
+                (interactive)
+                (let ((imenu-auto-rescan t) items)
+                  (unless (featurep 'imenu)
+                    (require 'imenu nil t))
+                  (setq items (imenu--make-index-alist t))
+                  (ivy-read "imenu items:"
+                            (ivy-imenu-get-candidates-from (delete (assoc "*Rescan*" items) items))
+                            :action (lambda (k) (goto-char k)))))
               (ivy-set-actions 'ivy-switch-buffer '(("k" (lambda (x)
                                                            (kill-buffer x)
                                                            (ivy--reset-state ivy-last))
-- 
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