Optimize away most expensive file prune calls, when refreshing

[git.ikiwiki.info.git] / doc / plugins / write.mdwn

diff --git a/doc/plugins/write.mdwn b/doc/plugins/write.mdwn
index 3976f9adf5a74b504b66efa8478e4d0acc2ebd6e..8e8c3311e4a1a23e8e9d1f36f5689e7adba55269 100644 (file)
--- a/doc/plugins/write.mdwn
+++ b/doc/plugins/write.mdwn
@@ -496,6 +496,13 @@ describes the plugin as a whole. For example:
   and undef if a rebuild could be needed in some circumstances, but is not
   strictly required.
 
+### genwrapper
+
+       hook(type => "genwrapper", id => "foo", call => \&genwrapper);
+
+This hook is used to inject C code (which it returns) into the `main`
+function of the ikiwiki wrapper when it is being generated.
+
 ## Plugin interface
 
 To import the ikiwiki plugin interface:
@@ -602,15 +609,31 @@ page created from it. (Ie, it appends ".html".)
 Use this when constructing the filename of a html file. Use `urlto` when
 generating a link to a page.
 
-#### `add_depends($$)`
+#### `add_depends($$;@)`
 
 Makes the specified page depend on the specified [[ikiwiki/PageSpec]].
 
+By default, dependencies are full content dependencies, meaning that the
+page will be updated whenever anything matching the PageSpec is modified.
+This default can be overridden by additional named parameters, which can be
+used to indicate weaker types of dependencies:
+
+* `presence` if set to true, only the presence of a matching page triggers
+  the dependency.
+* `links` if set to true, any change to links on a matching page
+  triggers the dependency. This includes when a link is added, removed,
+  or changes what it points to due to other changes. It does not include
+  the addition or removal of a duplicate link.
+
 #### `pagespec_match($$;@)`
 
-Passed a page name, and [[ikiwiki/PageSpec]], returns true if the
+Passed a page name, and [[ikiwiki/PageSpec]], returns a true value if the
 [[ikiwiki/PageSpec]] matches the page.
 
+Note that the return value is overloaded. If stringified, it will be a
+message indicating why the PageSpec succeeded, or failed, to match the
+page.
+
 Additional named parameters can be passed, to further limit the match.
 The most often used is "location", which specifies the location the
 PageSpec should match against. If not passed, relative PageSpecs will match