X-Git-Url: http://git.vanrenterghem.biz/git.ikiwiki.info.git/blobdiff_plain/9ec9d6901d444af48555abf7b4c26d1965c46017..f0e2ce4360a029f53ede032416acb311060aa79b:/doc/plugins/write.mdwn?ds=sidebyside diff --git a/doc/plugins/write.mdwn b/doc/plugins/write.mdwn index 0e4f2fd6f..fff142fa2 100644 --- a/doc/plugins/write.mdwn +++ b/doc/plugins/write.mdwn @@ -19,7 +19,7 @@ that can be fleshed out to make a useful plugin. `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 @@ -55,8 +55,8 @@ plugin, and a "call" parameter, which tells what function to call for the 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 @@ -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 @@ -322,6 +321,41 @@ This hook should avoid directly redirecting the user to a signin page, since it's sometimes used to test to see which pages in a set of pages a user can edit. +### cansave + + hook(type => "cansave", id => "foo", call => \&cansave); + +This hook can be used to implement arbitrary access methods to control +when a page being edited can be saved using the web interface (commits +from revision control bypass it). + +When a page is about to be saved, each registered cansave hook is +called in turn, and passed the page name, the edited content, a CGI +object and a session object. + +The return value of a cansave hook is interpreted the same as for the +canedit hook. + +### 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. + +### 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` and `canremove` hook, +but is passed: +* a CGI object +* a session object +* the named parameters `src`, `srcfile`, `dest` and `destfile`. + ### editcontent hook(type => "editcontent", id => "foo", call => \&editcontent); @@ -361,14 +395,29 @@ This hook is called whenever ikiwiki normally saves its state, just before the state is saved. The function can save other state, modify values before they're saved, etc. -### renamepage +### renamelink - hook(type => "renamepage", id => "foo", call => \&renamepage); + hook(type => "renamelink", id => "foo", call => \&renamelink); 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 => \&renamepages); + +When a page or set of pages is renamed, the referenced function is +called, and is passed: + +* a reference to an array of hashes with keys: `src`, `srcfile`, + `dest`, `destfile`, `required`. Such a hook function can modify + the array. +* a CGI object +* a session object ### getsetup @@ -432,7 +481,7 @@ describes the plugin as a whole. For example: 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, @@ -467,6 +516,15 @@ When pages are deleted, ikiwiki automatically deletes their pagestate too. Note that page state does not persist across wiki rebuilds, only across wiki updates. +### %wikistate + +The `%wikistate` hash can be used by a plugin to store persistant state +that is not bound to any one page. To set a value, use +`$wikistate{$id}{$key}=$value, where `$value` is anything Storable can +serialize, `$key` is any string you like, and `$id` must be the same as the +"id" parameter passed to `hook()` when registering the plugin, so that the +state can be dropped if the plugin is no longer used. + ### Other variables If your plugin needs to access data about other pages in the wiki. It can @@ -478,7 +536,7 @@ use the following hashes, using a page name as the key: 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 @@ -682,11 +740,21 @@ destination file, as registered by `will_render`. If the third parameter is passed and is true, an absolute url will be constructed instead of the default relative url. -#### `targetpage($$)` +#### `newpagefile($$)` + +This can be called when creating a new page, to determine what filename +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($$;$)` 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`. + ## Miscellaneous ### Internal use pages @@ -806,6 +874,30 @@ 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"/"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 @@ -832,3 +924,82 @@ to a hash containing all the config items. They should also implement a 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 ""; + }); + +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. + +All javascript code should be put in `.js` files in the `javascript` +underlay, and plugins using those files can enable use of the underlay by +calling `add_underlay("javascript");` in their `import` function. + +You'll have to arrange for `