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# `sphinx.ext.ifconfig` – Include content based on configuration

This extension is quite simple, and features only one directive:

`.. ifconfig::`

  Include content of the directive only if the Python expression given as an argument is `True`, evaluated in the namespace of the project’s configuration (that is, all registered variables from `conf.py` are available).

  For example, one could write

      .. ifconfig:: releaselevel in ('alpha', 'beta', 'rc')

         This stuff is only included in the built docs for unstable versions.

  To make a custom config value known to Sphinx, use `add_config_value()` in the setup function in `conf.py`, e.g.:

      def setup(app):
          app.add_config_value('releaselevel', '', 'env')

  The second argument is the default value, the third should always be `'env'` for such values (it selects if Sphinx re-reads the documents if the value changes).