The script does some number crunching on the document's index and shows the results as follows:
To view the unused topics, click OK. They're printed to a text file named UnusedTopics.txt which is placed on your desktop. The file is opened in your OS's default text editor.
Note: The script deals only with InDesign's index, reading all the information from the Index panel, not from a generated index. It's therefore not necessary to generate the index before collecting the statistics.
10 Feb. 2019: Unused topics weren't counted correctly; fixed.
31 Jan. 2015: posted.
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Show script (right-click, then Save Target/Link As to download)
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