Sometimes I have quite long org-mode documents. I tend to insert new headings and sub-headings throughout the whole document. However sometimes I think that I already used this text and begin searching in the document. The easier way would be to just insert the heading and have org-mode show some warning when this exact text exists somewhere in the document as heading. Currently I think best would be if the color of the heading changes. Is this possible and if yes, how can this be done?

  • Hm, this should be specified in greater detail. For an example, each section of a book might have a subsection named Motivation or Introduction. Does your proposal only concern the headings at the same level in the same branch of the document? – Tobias Feb 18 '16 at 17:33
  • Well, tough question. ;) I'd say that for my usecase every level in the same branch of the document is of concern. – Jens Kubieziel Feb 23 '16 at 12:03
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    your options include using a function in org-mode-hook to tell you if there are duplicates when you open the file, or in before-save-hook to tell you if there are duplicates before you save, or a function that uses something like helm/ivy to insert a new headline that is unique. – John Kitchin Mar 3 '16 at 2:33

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