From df10f8bff96fc3941ae90adbd6663ea7b8520fbf Mon Sep 17 00:00:00 2001
From: Kyle Meyer <kyle@kyleam.com>
Date: Wed, 21 Jan 2015 21:22:47 -0500
Subject: Add command bog-list-duplicate-heading-citekeys

---
 bog.el | 31 +++++++++++++++++++++++++++++++
 1 file changed, 31 insertions(+)

diff --git a/bog.el b/bog.el
index 63f2fbe..1666243 100644
--- a/bog.el
+++ b/bog.el
@@ -392,6 +392,37 @@ With prefix FILE, include only orphan citekeys from that file."
       (goto-char (point-min)))
     (pop-to-buffer bufname)))
 
+(defun bog-list-duplicate-heading-citekeys (&optional clear-cache)
+  "List citekeys that have more than one heading.
+With prefix CLEAR-CACHE, reset cache of citekey headings (which
+is only active if `bog-use-citekey-cache' is non-nil)."
+  (interactive "P")
+  (when clear-cache
+    (setq bog--all-heading-citekeys nil))
+  (let ((bufname "*Bog duplicate heading citekeys*")
+        (dup-cks (-sort (lambda (x y) (string-lessp x y))
+                        (bog--find-duplicates (bog-all-heading-citekeys)))))
+    (if (not dup-cks)
+        (message "No duplicate citekeys found")
+      (with-current-buffer (get-buffer-create bufname)
+        (erase-buffer)
+        (insert (mapconcat #'identity dup-cks "\n"))
+        (org-mode)
+        (bog-mode 1)
+        (goto-char (point-min)))
+      (pop-to-buffer bufname))))
+
+(defun bog--find-duplicates (list)
+  (let (dups uniqs)
+    (--each list
+      (cond
+       ((member it dups))
+       ((member it uniqs)
+        (push it dups))
+       (t
+        (push it uniqs))))
+    (nreverse dups)))
+
 
 ;;; Citekey-associated files
 
-- 
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