X-Git-Url: https://sipb.mit.edu/gitweb.cgi/ikiwiki.git/blobdiff_plain/9a62836d288fbced42b04a172baf52063ef71c61..0a081d78c4b4f24592f19e896b4f7daea30e9ef1:/doc/plugins/write.mdwn

diff --git a/doc/plugins/write.mdwn b/doc/plugins/write.mdwn
index daf70c8e2..5ee4acb53 100644
--- a/doc/plugins/write.mdwn
+++ b/doc/plugins/write.mdwn
@@ -196,7 +196,6 @@ generating the page.
 
 	hook(type => "pagetemplate", id => "foo", call => \&pagetemplate);
 
-
 [[Templates|wikitemplates]] are filled out for many different things in
 ikiwiki, like generating a page, or part of a blog page, or an rss feed, or
 a cgi. This hook allows modifying the variables available on those
@@ -821,6 +820,30 @@ it up in the history.
 
 It's ok if this is not implemented, and throws an error.
 
+#### `rcs_receive()`
+
+This is called when ikiwiki is running as a pre-receive hook (or
+equivalent), and is testing if changes pushed into the RCS from an
+untrusted user should be accepted. This is optional, and doesn't make
+sense to implement for all RCSs.
+
+It should examine the incoming changes, and do any sanity 
+checks that are appropriate for the RCS to limit changes to safe file adds,
+removes, and changes. If something bad is found, it should exit
+nonzero, to abort the push. Otherwise, it should return a list of
+files that were changed, in the form:
+
+	{
+		file => # name of file that was changed
+		action => # either "add", "change", or "remove"
+		path => # temp file containing the new file content, only
+			# needed for "add", and only if the file is an
+			# attachment, not a page
+	}
+
+The list will then be checked to make sure that each change is one that
+is allowed to be made via the web interface.
+
 ### PageSpec plugins
 
 It's also possible to write plugins that add new functions to
@@ -848,6 +871,56 @@ By the way, to parse a ikiwiki setup file and populate `%config`, a
 program just needs to do something like:
 `use IkiWiki::Setup; IkiWiki::Setup::load($filename)`
 
+### Function overriding
+
+Sometimes using ikiwiki's pre-defined hooks is not enough. Your plugin
+may need to replace one of ikiwiki's own functions with a modified version,
+or wrap one of the functions.
+
+For example, your plugin might want to override `displaytime`, to change
+the html markup used when displaying a date. Or it might want to override
+`IkiWiki::formattime`, to change how a date is formatted. Or perhaps you
+want to override `bestlink` and change how ikiwiki deals with WikiLinks.
+
+By venturing into this territory, your plugin is becoming tightly tied to
+ikiwiki's internals. And it might break if those internals change. But
+don't let that stop you, if you're brave.
+
+Ikiwiki provides an `inject()` function, that is a powerful way to replace
+any function with one of your own. This even allows you to inject a
+replacement for an exported function, like `bestlink`. Everything that
+imports that function will get your version instead. Pass it the name of
+the function to replace, and a new function to call. 
+
+For example, here's how to replace `displaytime` with a version using HTML 5
+markup:
+
+	inject(name => 'IkiWiki::displaytime', call => sub {
+		return "<time>".formattime(@_)."</time>";
+	});
+
+Here's how to wrap `bestlink` with a version that tries to handle
+plural words:
+
+	my $origbestlink=\&bestlink;
+	inject(name => 'IkiWiki::bestlink', call => \&mybestlink);
+
+	sub deplural ($) {
+		my $word=shift;
+		$word =~ s/e?s$//; # just an example :-)
+		return $word;
+	}
+
+	sub mybestlink ($$) {
+		my $page=shift;
+		my $link=shift;
+		my $ret=$origbestlink->($page, $link);
+		if (! length $ret) {
+			$ret=$origbestlink->($page, deplural($link));
+		}
+		return $ret;
+	}
+
 ### Javascript
 
 Some plugins use javascript to make ikiwiki look a bit more web-2.0-ish.