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I'd like to see some way to include certain files from the underlay only when the wiki has certain plugins enabled. For example:
* Only include smileys.mdwn and the smileys subdirectory if you enable the [[plugins/smiley]] plugin.
* Exclude openid.mdwn if you disable the [[plugins/openid]] plugin.
* Include shortcuts.mdwn only if you enable the [[plugins/shortcut]] plugin.
* Include blog.mdwn only if you don't disable the [[plugins/inline]] plugin.
* Include favicon.ico only if you enable the [[plugins/favicon]] plugin.
* Include wikiicons/diff.png (and the wikiicons directory) only if you enable the CGI.
* Include a hypothetical restructuredtexthelp.rst or similar for other formats only with those formats enabled.
I can see two good ways to implement this. Ideally, with
[[conditional_text_based_on_ikiwiki_features]] available, ikiwiki could
parse a page like conditionalpages.mdwn, which could contain a set of
conditional-wrapped page names; that seems like the most elegant and
ikiwiki-like approach. Alternatively, ikiwiki.setup could contain a
Perl-generated exclude option by default; that would work, but it seems
hackish.
> Another way might be to have a third directory of source files where
> plugins could drop in pages, and only build the files from there if their
> plugins were enabled.
>
> Using the conditionals in a page to control what other pages get built
> feels complex to me.
>
> Instead, this has been implmented as the `add_underlay()` function.
> [[done]]
> --[[Joey]]
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