X-Git-Url: http://git.vanrenterghem.biz/git.ikiwiki.info.git/blobdiff_plain/6551c1e5609967c0c7f947fa0e9d85d24e454d37..299bb8bef3811b16d29a0e8ebb2c292c8dd11020:/doc/plugins/write.mdwn?ds=inline

diff --git a/doc/plugins/write.mdwn b/doc/plugins/write.mdwn
index 5be90efdf..93c6d1d5c 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.
 
@@ -93,12 +107,22 @@ 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
 
@@ -159,6 +183,23 @@ use the following hashes, using a page name as the key:
   it is by using the IkiWiki::add_depends function, which takes as its
   parameters the page name and a [[GlobList]] of dependencies to add.
 
+# 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
 
 ikiwiki's support for revision control systems also uses pluggable perl