If `hook` is passed an optional "longname" parameter, this value is used
when prompting a user to choose a page type on the edit page form.
+### postscan
+
+ hook(type => "postscan", id => "foo", call => \&postscan);
+
+This hook is called once the page has been converted to html (but before
+the generated html is put in a template). The most common use is to
+update search indexes. Added in ikiwiki 2.54.
+
+The function is passed named parameters "page" and "content". Its return
+value is ignored.
+
### pagetemplate
hook(type => "pagetemplate", id => "foo", call => \&pagetemplate);
The function is passed named parameters: "page", "destpage", and "content",
and should return the sanitized content.
-### postscan
-
- hook(type => "postscan", id => "foo", call => \&postscan);
-
-This hook is called once the full page body is available (but before the
-format hook). The most common use is to update search indexes. Added in
-ikiwiki 2.54.
-
-The function is passed named parameters "page" and "content". Its return
-value is ignored.
-
### format
hook(type => "format", id => "foo", call => \&format);
Use this when constructing the filename of a html file. Use `urlto` when
generating a link to a page.
-#### `add_depends($$;@)`
+### `deptype(@)`
-Makes the specified page depend on the specified [[ikiwiki/PageSpec]].
+Use this function to generate ikiwiki's internal representation of a
+dependency type from one or more of these keywords:
-Additional named parameters can be passed, to indicate what type of
-dependency this is.
+* `content` is the default. Any change to the content
+ of a page triggers the dependency.
+* `presence` is only triggered by a change to the presence
+ of a page.
+* `links` is only triggered by a change to the links of a page.
+ This includes when a link is added, removed, or changes what
+ it points to due to other changes. It does not include the
+ addition or removal of a duplicate link.
-Currently, only a "content" parameter is specified. If set to 0, the
-dependency does not involve the content of pages matching the PageSpec, but
-only their existence.
+If multiple types are specified, they are combined.
-#### `pagespec_match($$;@)`
+#### `pagespec_match_list($$;@)`
-Passed a page name, and [[ikiwiki/PageSpec]], returns true if the
-[[ikiwiki/PageSpec]] matches the page.
+Passed a page name, and [[ikiwiki/PageSpec]], returns a list of pages
+in the wiki that match the [[ikiwiki/PageSpec]].
-Additional named parameters can be passed, to further limit the match.
-The most often used is "location", which specifies the location the
-PageSpec should match against. If not passed, relative PageSpecs will match
-relative to the top of the wiki.
+The page will automatically be made to depend on the specified
+[[ikiwiki/PageSpec]], so `add_depends` does not need to be called. This
+is often significantly more efficient than calling `add_depends` and
+`pagespec_match` in a loop. You should use this anytime a plugin
+needs to match a set of pages and do something based on that list.
-#### `pagespec_match_list($$;@)`
+Unlike pagespec_match, this may throw an error if there is an error in
+the pagespec.
+
+Additional named parameters can be specified:
+
+* `deptype` optionally specifies the type of dependency to add. Use the
+ `deptype` function to generate a dependency type.
+* `filter` is a reference to a function, that is called and passed a page,
+ and returns true if the page should be filtered out of the list.
+* `sort` specifies a sort order for the list. See
+ [[ikiwiki/PageSpec/sorting]] for the avilable sort methods.
+* `reverse` if true, sorts in reverse.
+* `num` if nonzero, specifies the maximum number of matching pages that
+ will be returned.
+* `list` makes it only match amoung the specified list of pages.
+ Default is to match amoung all pages in the wiki.
+
+Any other named parameters are passed on to `pagespec_match`, to further
+limit the match.
+
+#### `add_depends($$;$)`
+
+Makes the specified page depend on the specified [[ikiwiki/PageSpec]].
-Passed a reference to a list of page names, and [[ikiwiki/PageSpec]],
-returns the set of pages that match the [[ikiwiki/PageSpec]].
+By default, dependencies are full content dependencies, meaning that the
+page will be updated whenever anything matching the PageSpec is modified.
+This can be overridden by passing a `deptype` value as the third parameter.
+
+#### `pagespec_match($$;@)`
+
+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
relative to the top of the wiki.
-Unlike pagespec_match, this may throw an error if there is an error in
-the pagespec.
-
#### `bestlink($$)`
Given a page and the text of a link on the page, determine which
* anchor - set to make the link include an anchor
* rel - set to add a rel attribute to the link
* class - set to add a css class to the link
+* title - set to add a title attribute to the link
#### `readfile($;$)`
attempted at all, for any page, it can instead return an
IkiWiki::ErrorReason object explaining why.
+When constructing these objects, you should also include information about
+of any pages whose contents or other metadata influenced the result of the
+match. Do this by passing a list of pages, followed by `deptype` values.
+
+For example, "backlink(foo)" is influenced by the contents of page foo;
+"link(foo)" and "title(bar)" are influenced by the contents of any page
+they match; "created_before(foo)" is influenced by the metadata of foo;
+while "glob(*)" is not influenced by the contents of any page.
+
### Setup plugins
The ikiwiki setup file is loaded using a pluggable mechanism. If you look