document setup plugins

diff --git a/doc/plugins/write.mdwn b/doc/plugins/write.mdwn
index 5def4c67967165f927ae696954c254e72f49221d..4fd102bfd9149516599e780cbf14f687d73ea1e7 100644 (file)
--- a/doc/plugins/write.mdwn
+++ b/doc/plugins/write.mdwn
@@ -570,7 +570,9 @@ destination file, as registered by `will_render`.
 Passed a page and an extension, returns the filename that page will be
 rendered to.
 
 Passed a page and an extension, returns the filename that page will be
 rendered to.
 

-## Internal use pages
+## Miscellaneous
+
+### Internal use pages

 
 Sometimes it's useful to put pages in the wiki without the overhead of
 having them be rendered to individual html files. Such internal use pages
 
 Sometimes it's useful to put pages in the wiki without the overhead of
 having them be rendered to individual html files. Such internal use pages


@@ -583,7 +585,7 @@ either on them with extreme caution), and are not matched by regular
 PageSpecs glob patterns, but instead only by a special `internal()`
 [[ikiwiki/PageSpec]].
 
 PageSpecs glob patterns, but instead only by a special `internal()`
 [[ikiwiki/PageSpec]].
 

-## RCS plugins
+### RCS plugins

 
 ikiwiki's support for [[revision_control_systems|rcs]] also uses pluggable
 perl modules. These are in the `IkiWiki::RCS` namespace, for example
 
 ikiwiki's support for [[revision_control_systems|rcs]] also uses pluggable
 perl modules. These are in the `IkiWiki::RCS` namespace, for example


@@ -595,7 +597,7 @@ See IkiWiki::RCS::Stub for the full list of functions. It's ok if
 
 See [[RCS_details|rcs/details]] for some more info.
 
 
 See [[RCS_details|rcs/details]] for some more info.
 

-## PageSpec plugins
+### PageSpec plugins

 
 It's also possible to write plugins that add new functions to
 [[PageSpecs|ikiwiki/PageSpec]]. Such a plugin should add a function to the
 
 It's also possible to write plugins that add new functions to
 [[PageSpecs|ikiwiki/PageSpec]]. Such a plugin should add a function to the


@@ -605,3 +607,18 @@ two parameters: The name of the page being matched, and the thing to match
 against. It may also be passed additional, named parameters. It should return
 a IkiWiki::SuccessReason object if the match succeeds, or an
 IkiWiki::FailReason object if the match fails.
 against. It may also be passed additional, named parameters. It should return
 a IkiWiki::SuccessReason object if the match succeeds, or an
 IkiWiki::FailReason object if the match fails.

+
+### Setup plugins
+
+The ikiwiki setup file is loaded using a pluggable mechanism. If you
+look at the top of [[ikiwiki.setup]], it starts with 
+'use IkiWiki::Setup::Standard', and the rest of the file is passed to
+that module's import method.
+
+It's possible to write other modules in the `IkiWiki::Setup::` namespace that
+can be used to configure ikiwiki in different ways. These modules should,
+when imported, populate `$IkiWiki::Setup::raw_setup` with a reference
+to a hash containing all the config items.
+
+By the way, to parse a ikiwiki setup file, a program just needs to
+do something like `use IkiWiki::Setup; my %setup=IkiWiki::Setup::load($filename)`