`IkiWiki::Plugin::pagecount` is another simple example. All perl plugins
should `use IkiWiki` to import the ikiwiki plugin interface. It's a good
idea to include the version number of the plugin interface that your plugin
-expects: `use IkiWiki 2.00`.
+expects: `use IkiWiki 3.00`.
An external plugin is an executable program. It can be written in any
language. Its interface to ikiwiki is via XML RPC, which it reads from
hook.
An optional "last" parameter, if set to a true value, makes the hook run
-after all other hooks of its type. Useful if the hook depends on some other
-hook being run first.
+after all other hooks of its type, and an optional "first" parameter makes
+it run first. Useful if the hook depends on some other hook being run first.
## Types of hooks
This allows a plugin to manipulate the list of files that need to be
built when the wiki is refreshed. The function is passed a reference to an
-array of pages that will be rebuilt, and can modify the array, either
+array of files that will be rebuilt, and can modify the array, either
adding or removing files from it.
### scan
This hook is called early in the process of building the wiki, and is used
as a first pass scan of the page, to collect metadata about the page. It's
-mostly used to scan the page for WikiLinks, and add them to `%links`.
-Present in IkiWiki 2.40 and later.
+mostly used to scan the page for [[WikiLinks|ikiwiki/WikiLink]], and add
+them to `%links`. Present in IkiWiki 2.40 and later.
The function is passed named parameters "page" and "content". Its return
value is ignored.
If `hook` is passed an optional "scan" parameter, set to a true value, this
makes the hook be called during the preliminary scan that ikiwiki makes of
updated pages, before begining to render pages. This should be done if the
-hook modifies data in `%links`. Note that doing so will make the hook be
-run twice per page build, so avoid doing it for expensive hooks. (As an
-optimisation, if your preprocessor hook is called in a void context, you
-can assume it's being run in scan mode, and avoid doing expensive things at
-that point.)
+hook modifies data in `%links` (typically by calling `add_link`). Note that
+doing so will make the hook be run twice per page build, so avoid doing it
+for expensive hooks. (As an optimisation, if your preprocessor hook is
+called in a void context, you can assume it's being run in scan mode, and
+avoid doing expensive things at that point.)
Note that if the [[htmlscrubber]] is enabled, html in
preprocessor [[ikiwiki/directive]] output is sanitised, which may limit what
hook(type => "linkify", id => "foo", call => \&linkify);
-This hook is called to convert [[WikiLinks|WikiLink]] on the page into html
+This hook is called to convert [[WikiLinks|ikiwiki/WikiLink]] on the page into html
links. The function is passed named parameters "page", "destpage", and
"content". It should return the linkified content. Present in IkiWiki 2.40
and later.
Plugins that implement linkify must also implement a scan hook, that scans
-for the links on the page and adds them to `%links`.
+for the links on the page and adds them to `%links` (typically by calling
+`add_link`).
### htmlize
return the htmlized content.
If `hook` is passed an optional "keepextension" parameter, set to a true
-value, then this extension will not be stripped from the source filename when
+value, then the extension will not be stripped from the source filename when
generating the page.
+If `hook` is passed an optional "noextension" parameter, set to a true
+value, then the id parameter specifies not a filename extension, but
+a whole filename that can be htmlized. This is useful for files
+like `Makefile` that have no extension.
+
+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.
+
### pagetemplate
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
### canedit
- hook(type => "canedit", id => "foo", call => \&pagelocked);
+ hook(type => "canedit", id => "foo", call => \&canedit);
This hook can be used to implement arbitrary access methods to control when
a page can be edited using the web interface (commits from revision control
since it's sometimes used to test to see which pages in a set of pages a
user can edit.
+### canremove
+
+ hook(type => "canremove", id => "foo", call => \&canremove);
+
+This hook can be used to implement arbitrary access methods to control
+when a page can be removed using the web interface (commits from
+revision control bypass it). It works exactly like the `canedit` hook,
+but is passed the named parameters `cgi` (a CGI object), `session`
+(a session object) and `page` (the page subject to deletion).
+
+### canrename
+
+ hook(type => "canrename", id => "foo", call => \&canrename);
+
+This hook can be used to implement arbitrary access methods to control when
+a page can be renamed using the web interface (commits from revision control
+bypass it). It works exactly like the `canedit` hook,
+but is passed the named parameters `cgi` (a CGI object), `session` (a
+session object), `src`, `srcfile`, `dest` and `destfile`.
+
+### checkcontent
+
+ hook(type => "checkcontent", id => "foo", call => \&checkcontent);
+
+This hook is called to check the content a user has entered on a page,
+before it is saved, and decide if it should be allowed.
+
+It is passed named parameters: `content`, `page`, `cgi`, and `session`. If
+the content the user has entered is a comment, it may also be passed some
+additional parameters: `author`, `url`, and `subject`. The `subject`
+parameter may also be filled with the user's comment about the change.
+
+Note: When the user edits an existing wiki page, this hook is also
+passed a `diff` named parameter, which will include only the lines
+that they added to the page, or modified.
+
+The hook should return `undef` on success. If the content is disallowed, it
+should return a message stating what the problem is, or a function
+that can be run to perform whatever action is necessary to allow the user
+to post the content.
+
### editcontent
hook(type => "editcontent", id => "foo", call => \&editcontent);
hook(type => "renamepage", id => "foo", call => \&renamepage);
This hook is called by the [[plugins/rename]] plugin when it renames
-something. The hook is passed named parameters: `page`, `oldpage`,
-`newpage`, and `content`, and should try to modify the content to reflect
-the name change. For example, by converting links to point to the new page.
+something, once per page linking to the renamed page's old location.
+The hook is passed named parameters: `page`, `oldpage`, `newpage`, and
+`content`, and should try to modify the content of `page` to reflect
+the name change. For example, by converting links to point to the
+new page.
+
+### rename
+
+ hook(type => "rename", id => "foo", call => \&rename);
+
+When a page or set of pages is renamed, the referenced function is
+called for every page, and is passed named parameters:
+
+* `torename`: a reference to a hash with keys: `src`, `srcfile`,
+ `dest`, `destfile`, `required`.
+* `cgi`: a CGI object
+* `session`: a session object.
+
+Such a hook function returns any additional rename hashes it wants to
+add. This hook is applied recursively to returned additional rename
+hashes, so that it handles the case where two plugins use the hook:
+plugin A would see when plugin B adds a new file to be renamed.
### getsetup
* `example` can be set to an example value.
* `description` is a short description of the option.
* `link` is a link to further information about the option. This can either
- be a wikilink, or an url.
+ be a [[ikiwiki/WikiLink]], or an url.
* `advanced` can be set to true if the option is more suitable for advanced
users.
* `safe` should be false if the option should not be displayed in unsafe
and undef if a rebuild could be needed in some circumstances, but is not
strictly required.
-### targetpage
+### genwrapper
- hook(type => "targetpage", id => "foo", call => \&targetpage);
+ hook(type => "genwrapper", id => "foo", call => \&genwrapper);
-This hook can be used to override the name of the file a page should
-be compiled into.
-
-It should return the target filename.
+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:
- use IkiWiki '2.00';
+ use IkiWiki '3.00';
This will import several variables and functions into your plugin's
namespace. These variables and functions are the ones most plugins need,
destination file.
* `%pagesources` contains the name of the source file for each page.
-Also, the %IkiWiki::version variable contains the version number for the
+Also, the `%IkiWiki::version` variable contains the version number for the
ikiwiki program.
### Library functions
PageSpec should match against. If not passed, relative PageSpecs will match
relative to the top of the wiki.
+#### `pagespec_match_list($$;@)`
+
+Passed a reference to a list of page names, and [[ikiwiki/PageSpec]],
+returns the set of pages that match the [[ikiwiki/PageSpec]].
+
+Additional named parameters can be passed, to further limit the match.
+The most often used is "location", which specifies the location the
+PageSpec should match against. If not passed, relative PageSpecs will match
+relative to the top of the wiki.
+
+Unlike pagespec_match, this may throw an error if there is an error in
+the pagespec.
+
#### `bestlink($$)`
Given a page and the text of a link on the page, determine which
Many plugins need to generate html links and add them to a page. This is
done by using the `htmllink` function. The usual way to call
-`htmlllink` is:
+`htmllink` is:
htmllink($page, $page, $link)
If the destination directory doesn't exist, it will first be created.
+The filename and directory are separate parameters because of
+some security checks done to avoid symlink attacks. Before writing a file,
+it checks to make sure there's not a symlink with its name, to avoid
+following the symlink. If the filename parameter includes a subdirectory
+to put the file in, it also checks if that subdirectory is a symlink, etc.
+The directory parameter, however, is not checked for symlinks. So,
+generally the directory parameter is a trusted toplevel directory like
+the srcdir or destdir, and any subdirectories of this are included in the
+filename parameter.
+
#### `will_render($$)`
Given a page name and a destination file name (not including the base
#### `linkpage($)`
This converts text that could have been entered by the user as a
-[[WikiLink]] into a wiki page name.
+[[ikiwiki/WikiLink]] into a wiki page name.
#### `srcfile($;$)`
to save the page to. It's passed a page name, and its type, and returns
the name of the file to create, relative to the srcdir.
-#### `targetpage($$)`
+#### `targetpage($$;$)`
Passed a page and an extension, returns the filename that page will be
rendered to.
+Optionally, a third parameter can be passed, to specify the preferred
+filename of the page. For example, `targetpage("foo", "rss", "feed")`
+will yield something like `foo/feed.rss`.
+
+#### `add_link($$)`
+
+This adds a link to `%links`, ensuring that duplicate links are not
+added. Pass it the page that contains the link, and the link text.
+
## Miscellaneous
### Internal use pages
To make an internal use page, register a filename extension that starts
with "_". Internal use pages cannot be edited with the web interface,
-generally shouldn't contain wikilinks or preprocessor directives (use
+generally shouldn't contain [[WikiLinks|ikiwiki/WikiLink]] or preprocessor directives (use
either on them with extreme caution), and are not matched by regular
PageSpecs glob patterns, but instead only by a special `internal()`
[[ikiwiki/PageSpec]].
Passed a message, user, and ip address. Should commit all staged changes.
Returns undef on success, and an error message on failure.
-Changes can be staged by calls to `rcs_add, `rcs_remove`, and
+Changes can be staged by calls to `rcs_add`, `rcs_remove`, and
`rcs_rename`.
#### `rcs_add($)`
It's ok if this is not implemented, and throws an error.
+#### `rcs_receive()`
+
+This is called when ikiwiki is running as a pre-receive hook (or
+equivalent), and is testing if changes pushed into the RCS from an
+untrusted user should be accepted. This is optional, and doesn't make
+sense to implement for all RCSs.
+
+It should examine the incoming changes, and do any sanity
+checks that are appropriate for the RCS to limit changes to safe file adds,
+removes, and changes. If something bad is found, it should exit
+nonzero, to abort the push. Otherwise, it should return a list of
+files that were changed, in the form:
+
+ {
+ file => # name of file that was changed
+ action => # either "add", "change", or "remove"
+ path => # temp file containing the new file content, only
+ # needed for "add"/"change", and only if the file
+ # is an attachment, not a page
+ }
+
+The list will then be checked to make sure that each change is one that
+is allowed to be made via the web interface.
+
### PageSpec plugins
It's also possible to write plugins that add new functions to
IkiWiki::PageSpec package, that is named `match_foo`, where "foo()" is
how it will be accessed in a [[ikiwiki/PageSpec]]. The function will be passed
two parameters: The name of the page being matched, and the thing to match
-against. It may also be passed additional, named parameters. It should return
-a IkiWiki::SuccessReason object if the match succeeds, or an
-IkiWiki::FailReason object if the match fails.
+against. It may also be passed additional, named parameters.
+
+It should return a IkiWiki::SuccessReason object if the match succeeds, or
+an IkiWiki::FailReason object if the match fails. If the match cannot be
+attempted at all, for any page, it can instead return an
+IkiWiki::ErrorReason object explaining why.
### Setup plugins
program just needs to do something like:
`use IkiWiki::Setup; IkiWiki::Setup::load($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|ikiwiki/WikiLink]].
+
+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.