X-Git-Url: http://git.vanrenterghem.biz/git.ikiwiki.info.git/blobdiff_plain/6551c1e5609967c0c7f947fa0e9d85d24e454d37..cade16fbb6df5b1374f28a393ef9bf2b715c143b:/doc/plugins/write.mdwn

diff --git a/doc/plugins/write.mdwn b/doc/plugins/write.mdwn
index 5be90efdf..6d9054389 100644
--- a/doc/plugins/write.mdwn
+++ b/doc/plugins/write.mdwn
@@ -38,9 +38,10 @@ the preprocessor directive.
 Each time the directive is processed, the referenced function (`preprocess`
 in the example above) is called, and is passed named parameters. A "page"
 parameter gives the name of the page that embedded the preprocessor
-directive. All parameters included in the directive are included as named
-parameters as well. Whatever the function returns goes onto the page in
-place of the directive.
+directive, while a "destpage" parameter gices the name of the page the
+content is going to (different for inlined pages). All parameters included
+in the directive are included as named parameters as well. Whatever the
+function returns goes onto the page in place of the directive.
 
 ## Error handing
 
@@ -63,12 +64,25 @@ with the rest of the page.
 Beyond PreProcessorDirectives, Other types of hooks that can be used by
 plugins include:
 
+## getopt
+
+	IkiWiki::hook(type => "getopt", id => "foo", call => \&getopt);
+
+This allows for plugins to perform their own processing of command-line
+options and so add options to the ikiwiki command line. It's called during
+command line processing, with @ARGV full of any options that ikiwiki was
+not able to process on its own. The function should process any options it
+can, removing them from @ARGV, and probably recording the configuration
+settings in %IkiWiki::config. It should take care not to abort if it sees
+an option it cannot process, and should just skip over those options and
+leave them in @ARGV.
+
 ## checkconfig
 
 	IkiWiki::hook(type => "checkconfig", id => "foo", call => \&checkconfig);
 
-This is useful if the plugin needs to check for, or modify ikiwiki's
-configuration. It's called early in the ikiwiki startup process. The
+This is useful if the plugin needs to check for or modify ikiwiki's
+configuration. It's called early in the startup process. The
 function is passed no values. It's ok for the function to call
 IkiWiki::error if something isn't configured right.
 
@@ -82,7 +96,7 @@ make arbitrary changes. The function is passed named parameters `page` and
 
 ## htmlize
 
-	IkiWiki::hook(type => "htmlize", id => "ext", call => \&filter);
+	IkiWiki::hook(type => "htmlize", id => "ext", call => \&htmlize);
 
 Runs on the raw source of a page and turns it into html. The id parameter
 specifies the filename extension that a file must have to be htmlized using
@@ -93,25 +107,45 @@ languages to ikiwiki.
 
 	IkiWiki::hook(type => "pagetemplate", id => "foo", call => \&pagetemplate);
 
-Each time a page is rendered, a [[template|templates]] is filled out.
-This hook allows modifying that template. The function is passed the name
-of the page, and a `HTML::Template` object that is the template that will
-be used to generate the page. It can manipulate that template, the most
-common thing to do is probably to call $template->param() to add a new
-custom parameter to the template.
+Each time a page (or part of a blog page, or an rss feed) is rendered, a
+[[template|templates]] is filled out. This hook allows modifying that
+template. The function is passed named parameters. The "page" and
+"destpage" parameters are the same as for a preprocess hook. The "template"
+parameter is a `HTML::Template` object that is the template that will be
+used to generate the page. The function can manipulate that template
+object.
+
+The most common thing to do is probably to call $template->param() to add
+a new custom parameter to the template. Note that in order to be robust,
+it's a good idea to check whether the template has a variable before trying
+to set it, as setting a variable that's not present is an error.
+
+	if ($template->query(name => 'foo')) {
+		$template->param("foo" => "bar");
+	}
 
 ## sanitize
 
 	IkiWiki::hook(type => "sanitize", id => "foo", call => \&sanitize);
 
 Use this to implement html sanitization or anything else that needs to
-modify the content of a page after it has been fully converted to html.
+modify the body of a page after it has been fully converted to html.
 The function is passed the page content and should return the sanitized
 content.
 
+## format
+
+	IkiWiki::hook(type => "format", id => "foo", call => \&format);
+
+The function is passed the complete page content and can reformat it
+and return the new content. The difference between format and sanitize is
+that sanitize only acts on the page body, while format can modify the
+entire html page including the header and footer inserted by ikiwiki, the
+html document type, etc.
+
 ## delete
 
-	IkiWiki::hook(type => "delete", id => "foo", call => \&dele);
+	IkiWiki::hook(type => "delete", id => "foo", call => \&delete);
 
 Each time a page or pages is removed from the wiki, the referenced function
 is called, and passed the names of the source files that were removed.
@@ -133,6 +167,14 @@ called in turn, and passed a CGI object. The hook should examine the
 parameters, and if it will handle this CGI request, output a page and
 terminate the program.
 
+## savestate
+
+	IkiWiki::hook(type => "savestate", id => "foo", call => \&savestate);
+
+This hook is called wheneven ikiwiki normally saves its state, just before
+the state is saved. The function can save other state, modify values before
+they're saved, etc.
+
 # Wiki configuration
 
 A plugin can access the wiki's configuration via the `%IkiWiki::config`
@@ -151,13 +193,32 @@ use the following hashes, using a page name as the key:
 * `%IkiWiki::renderedfiles` contains the name of the file rendered by a
   page
 * `%IkiWiki::pagesources` contains the name of the source file for a page.
-* `%IkiWiki::depends` contains a [[GlobList]] that is used to specify other
+* `%IkiWiki::depends` contains a [[PageSpec]] that is used to specify other
   pages that a page depends on. If one of its dependencies is updated, the
   page will also get rebuilt. 
   
   Many plugins will need to add dependencies to this hash; the best way to do
   it is by using the IkiWiki::add_depends function, which takes as its
-  parameters the page name and a [[GlobList]] of dependencies to add.
+  parameters the page name and a [[PageSpec]] of dependencies to add.
+* `%IkiWiki::forcerebuild` any pages set as the keys to this hash will be
+  treated as if they're modified and rebuilt.
+
+# A note on generating html links
+
+Many plugins need to generate html links and add them to a page. This is
+done by using the `IkiWiki::htmllink` function. The usual way to call
+htmlllink is:
+
+	htmllink($page, $page, $link)
+
+Why is $page repeated? Because if a page is inlined inside another, and a
+link is placed on it, the right way to make that link is actually:
+
+	htmllink($page, $destpage, $link)
+
+Here $destpage is the inlining page. A destpage parameter is passed to some
+of the hook functions above; the ones that are not passed it are not used
+during inlining and don't need to worry about this issue.
 
 # RCS plugins