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docs: note that jansson is required for interactive mode #1669

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docs: note that jansson is required for interactive mode #1669

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8 changes: 8 additions & 0 deletions docs/interactive-mode.rst
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Expand Up @@ -9,6 +9,14 @@ can be used programmatically to control ctags generation. In this mode, json
commands are received over stdin, and corresponding responses are emitted over
stdout.

This feature needs ctags to be built with json support and this requires libjansson to be installed
at build-time. If it's supported it will be listed in the output of ``--list-features``:

.. code-block:: console
$ ./ctags --list-features | grep json
json
Communication with Universal ctags over stdio uses the `json lines`_ format, where each
json object appears on a single line and is terminated with a newline.

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