X-Git-Url: http://git.vanrenterghem.biz/git.ikiwiki.info.git/blobdiff_plain/0b22579368f3f98844e674921f1dc0067ce30ccf..0b4981588e6e7e5c49219fa534482f789dc14dad:/doc/plugins/write.mdwn diff --git a/doc/plugins/write.mdwn b/doc/plugins/write.mdwn index dcab041dc..b6d0611dc 100644 --- a/doc/plugins/write.mdwn +++ b/doc/plugins/write.mdwn @@ -1,4 +1,4 @@ -lkiwiki's plugin interface allows all kinds of useful [[plugins]] to be +Ikiwiki's plugin interface allows all kinds of useful [[plugins]] to be written to extend ikiwiki in many ways. Despite the length of this page, it's not really hard. This page is a complete reference to everything a plugin might want to do. There is also a quick [[tutorial]]. @@ -31,20 +31,26 @@ is accomplished by calling various hooks provided by plugins. ### compiler -As a compiler, ikiwiki starts by calling the `refresh` hook. Then it checks -the wiki's source to find new or changed pages. The `needsbuild` hook is -then called to allow manipulation of the list of pages that need to be -built. - -Now that it knows what pages it needs to build, ikiwiki runs two -compile passes. First, it runs `scan` hooks, which collect metadata about -the pages. Then it runs a page rendering pipeline, by calling in turn these -hooks: `filter`, `preprocess`, `linkify`, `htmlize`, `indexhtml`, -`pagetemplate`, `sanitize`, `format`. - -After all necessary pages are built, it calls the `change` hook. Finally, -if a page is was deleted, the `delete` hook is called, and the files that -page had previously produced are removed. +As a compiler, ikiwiki starts by calling the +[[`refresh`|plugins/write#refresh]] hook. Then it checks the wiki's source to +find new or changed pages. The [[`needsbuild`|plugins/write#needsbuild]] hook +is then called to allow manipulation of the list of pages that need to be +built. + +Now that it knows what pages it needs to build, ikiwiki runs two compile +passes. First, it runs [[`scan`|plugins/write#scan]] hooks, which collect +metadata about the pages. Then it runs a page rendering pipeline, by calling +in turn these hooks: [[`filter`|plugins/write#filter]], +[[`preprocess`|plugins/write#preprocess]], +[[`linkify`|plugins/write#linkify]], [[`htmlize`|plugins/write#htmlize]], +[[`indexhtml`|plugins/write#indexhtml]], +[[`pagetemplate`|plugins/write#pagetemplate]], +[[`sanitize`|plugins/write#sanitize]], [[`format`|plugins/write#format]]. + +After all necessary pages are built, it calls the +[[`changes`|plugins/write#changes]] hook. Finally, if a page was deleted, the +[[`delete`|plugins/write#delete]] hook is called, and the files that page had +previously produced are removed. ### cgi @@ -53,33 +59,39 @@ an example. Alice browses to a page and clicks Edit. -* Ikiwiki is run as a cgi. It assigns Alice a session cookie, and, - by calling the `auth` hooks, sees that she is not yet logged in. -* The `sessioncgi` hooks are then called, and one of them, - from the [[editpage]] plugin, notices that the cgi has been told "do=edit". -* The [[editpage]] plugin calls the `canedit` hook to check if this - page edit is allowed. The [[signinedit]] plugin has a hook that says not: - Alice is not signed in. -* The [[signinedit]] plugin then launches the signin process. A signin - page is built by calling the `formbuilder_setup` hook. +* Ikiwiki is run as a cgi. It assigns Alice a session cookie, and, by calling + the [[`auth`|plugins/write#auth]] hooks, sees that she is not yet logged in. +* The [[`sessioncgi`|plugins/write#sessioncgi]] hooks are then called, and one + of them, from the [[editpage]] plugin, notices that the cgi has been told + "do=edit". +* The [[editpage]] plugin calls the [[`canedit`|plugins/write#canedit]] hook + to check if this page edit is allowed. The [[signinedit]] plugin has a hook + that says not: Alice is not signed in. +* The [[signinedit]] plugin then launches the signin process. A signin page is + built by calling the [[`formbuilder_setup`|plugins/write#formbuilder]] + hook. Alice signs in with her openid. -* The [[openid]] plugin's `formbuilder` hook sees that an openid was - entered in the signin form, and redirects to Alice's openid provider. -* Alice's openid provider calls back to ikiwiki. The [[openid]] plugin - has an `auth` hook that finishes the openid signin process. +* The [[openid]] plugin's [[`formbuilder`|plugins/write#formbuilder]] hook + sees that an openid was entered in the signin form, and redirects to Alice's + openid provider. +* Alice's openid provider calls back to ikiwiki. The [[openid]] plugin has an + [[`auth`|plugins/write#auth]] hook that finishes the openid signin process. * Signin complete, ikiwiki returns to what Alice was doing before; editing a page. -* Now all the `canedit` hooks are happy. The [[editpage]] plugin calls - `formbuilder_setup` to display the page editing form. +* Now all the [[`canedit`|plugins/write#canedit]] hooks are happy. The + [[editpage]] plugin calls + [[`formbuilder_setup`|plugins/write#formbuilder]] to display the page + editing form. Alice saves her change to the page. -* The [[editpage]] plugin's `formbuilder` hook sees that the Save button - was pressed, and calls the `checkcontent` and `editcontent` hooks. - Then it saves the page to disk, and branches into the compiler part - of ikiwiki to refresh the wiki. +* The [[editpage]] plugin's [[`formbuilder`|plugins/write#formbuilder]] hook + sees that the Save button was pressed, and calls the + [[`checkcontent`|plugins/write#checkcontent]] and + [[`editcontent`|plugins/write#editcontent]] hooks. Then it saves the page + to disk, and branches into the compiler part of ikiwiki to refresh the wiki. ## Types of plugins @@ -165,7 +177,7 @@ is populated at this point, but other state has not yet been loaded. The function is passed no values. It's ok for the function to call `error()` if something isn't configured right. -### refresh +### refresh hook(type => "refresh", id => "foo", call => \&refresh); @@ -173,7 +185,7 @@ This hook is called just before ikiwiki scans the wiki for changed files. It's useful for plugins that need to create or modify a source page. The function is passed no values. -### needsbuild +### needsbuild hook(type => "needsbuild", id => "foo", call => \&needsbuild); @@ -187,7 +199,7 @@ modified version of its input. It can add or remove files from it. The second parameter passed to the function is a reference to an array of files that have been deleted. -### scan +### scan hook(type => "scan", id => "foo", call => \&scan); @@ -199,7 +211,30 @@ them to `%links`. Present in IkiWiki 2.40 and later. The function is passed named parameters "page" and "content". Its return value is ignored. -### filter +### readtemplate + + hook(type => "readtemplate", id => "foo", call => \&readtemplate); + +Runs on the raw source of a page or `*.tmpl` file that is being +used as a template, before it is parsed by [[!cpan HTML::Template]]. +For instance, the [[plugins/templatebody]] plugin uses this to return +the content of the [[ikiwiki/directive/templatebody]] directive (if there +is one) instead of the page's full content. + +The function is passed named parameters: + +* `id`: the name under which the template was looked up, + such as `page.tmpl` or `note` +* `page`: the name of the template as a page or attachment in the wiki, + such as `templates/note`, or `undef` if it's outside the wiki (e.g. in + `/usr/share/ikiwiki/templates`) +* `content`: the content of the corresponding file +* `untrusted`: true if the template was loaded from the wiki or an underlay, + false if it was loaded from a trusted location + +It should return the replacement content. + +### filter hook(type => "filter", id => "foo", call => \&filter); @@ -207,7 +242,7 @@ Runs on the full raw source of a page, before anything else touches it, and can make arbitrary changes. The function is passed named parameters "page", "destpage", and "content". It should return the filtered content. -### preprocess +### preprocess Adding a preprocessor [[ikiwiki/directive]] is probably the most common use of a plugin. @@ -250,7 +285,7 @@ format at preprocessor time. Text output by a preprocessor directive will be linkified and passed through markdown (or whatever engine is used to htmlize the page) along with the rest of the page. -### linkify +### linkify hook(type => "linkify", id => "foo", call => \&linkify); @@ -263,7 +298,7 @@ Plugins that implement linkify must also implement a scan hook, that scans for the links on the page and adds them to `%links` (typically by calling `add_link`). -### htmlize +### htmlize hook(type => "htmlize", id => "ext", call => \&htmlize); @@ -287,7 +322,7 @@ 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. -### indexhtml +### indexhtml hook(type => "indexhtml", id => "foo", call => \&indexhtml); @@ -298,7 +333,7 @@ update search indexes. Added in ikiwiki 2.54. The function is passed named parameters "page", "destpage", and "content". Its return value is ignored. -### pagetemplate +### pagetemplate hook(type => "pagetemplate", id => "foo", call => \&pagetemplate); @@ -333,7 +368,7 @@ page (next to Edit, RecentChanges, etc). The hook is passed a "page" parameter, and can return a list of html fragments to add to the action bar. -### sanitize +### sanitize hook(type => "sanitize", id => "foo", call => \&sanitize); @@ -343,7 +378,7 @@ modify the body of a page after it has been fully converted to html. The function is passed named parameters: "page", "destpage", and "content", and should return the sanitized content. -### format +### format hook(type => "format", id => "foo", call => \&format); @@ -356,21 +391,48 @@ when the page is being previewed.) The function is passed named parameters: "page" and "content", and should return the formatted content. -### delete +### build_affected + + hook(type => "build_affected", id => "foo", call => \&build_affected); + +This hook is called after the directly changed pages have been built, +and can cause extra pages to be built. If links and backlinks were provided +by a plugin, this would be where that plugin would rebuild pages whose +backlinks have changed, for instance. The [[trail]] plugin uses this hook +to rebuild pages whose next or previous page has changed. + +The function should currently ignore its parameters. It returns a list with +an even number of items (a hash in list context), where the first item of +each pair is a page name to be rebuilt (if it was not already rebuilt), and +the second is a log message resembling +`building plugins/write because the phase of the moon has changed`. + +### delete hook(type => "delete", id => "foo", call => \&delete); -Each time a page or pages is removed from the wiki, the referenced function +After 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. -### change +### rendered - hook(type => "change", id => "foo", call => \&render); + hook(type => "rendered", id => "foo", call => \&rendered); -Each time ikiwiki renders a change or addition (but not deletion) to the +After ikiwiki renders a change or addition (but not deletion) to the wiki, the referenced function is called, and passed the names of the source files that were rendered. +(This hook used to be called "change", but that was not accurate. +For now, plugins using the old hook name will still work.) + +### changes + + hook(type => "changes", id => "foo", call => \&changes); + +After ikiwiki renders changes to the wiki, the referenced function is +called, and passed the names of the source files that were added, modified, +or deleted. + ### cgi hook(type => "cgi", id => "foo", call => \&cgi); @@ -383,7 +445,7 @@ parameters, and if it will handle this CGI request, output a page Note that cgi hooks are called as early as possible, before any ikiwiki state is loaded, and with no session information. -### auth +### auth hook(type => "auth", id => "foo", call => \&auth); @@ -396,7 +458,10 @@ object's "name" parameter to the authenticated user's name. Note that if the name is set to the name of a user who is not registered, a basic registration of the user will be automatically performed. -### sessioncgi +Auth plugins can use the loginselector helper plugin to let the user +select which authentication method to use. + +### sessioncgi hook(type => "sessioncgi", id => "foo", call => \&sessioncgi); @@ -405,7 +470,7 @@ is only run once a session object is available. It is passed both a CGI object and a session object. To check if the user is in fact signed in, you can check if the session object has a "name" parameter set. -### canedit +### canedit hook(type => "canedit", id => "foo", call => \&canedit); @@ -445,7 +510,7 @@ 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 +### checkcontent hook(type => "checkcontent", id => "foo", call => \&checkcontent); @@ -466,7 +531,7 @@ 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 +### editcontent hook(type => "editcontent", id => "foo", call => \&editcontent); @@ -477,7 +542,7 @@ user, the page name, a `CGI` object, and the user's `CGI::Session`. It can modify the content as desired, and should return the content. -### formbuilder +### formbuilder hook(type => "formbuilder_setup", id => "foo", call => \&formbuilder_setup); hook(type => "formbuilder", id => "foo", call => \&formbuilder); @@ -594,7 +659,7 @@ describes the plugin as a whole. For example: strictly required. * `section` can optionally specify which section in the config file the plugin fits in. The convention is to name the sections the - same as the tags used for [[plugins|plugin]] on this wiki. + same as the tags used for [[plugins]] on this wiki. ### genwrapper @@ -645,7 +710,7 @@ wiki updates. 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 `$value` is anything Storable can +`$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. @@ -676,21 +741,28 @@ Ordinary [[WikiLinks|ikiwiki/WikiLink]] appear in `%links`, but not in ### `%pagesources` -The `%pagesources` has can be used to look up the source filename +The `%pagesources` hash can be used to look up the source filename of a page. So the key is the page name, and the value is the source filename. Do not modify this hash. +Attachments also appear in this hash, with the same key and value. + $pagesources{"foo"} = "foo.mdwn"; + $pagesources{"logo/ikiwiki.png"} = "logo/ikiwiki.png"; + ### `%destsources` The `%destsources` hash records the name of the source file used to create each destination file. The key is the output filename (ie, -"foo/index.html"), and the value is the source filename that it was built -from (eg, "foo.mdwn"). Note that a single source file may create multiple +"foo/index.html"), and the value is the name of the page that it was built +from (eg, "foo"). Note that a single source file may create multiple destination files. Do not modify this hash directly; call `will_render()`. - - $destsources{"foo/index.html"} = "foo.mdwn"; + +Attachments also appear in this hash, with the same key and value. + + $destsources{"foo/index.html"} = "foo"; + $destsources{"logo/ikiwiki.png"} = "logo/ikiwiki.png"; ## Library functions @@ -1220,6 +1292,20 @@ and an error message on failure. This hook and `rcs_preprevert` are optional, if not implemented, no revert web interface will be available. +### `rcs_find_changes($)` + +Finds changes committed since the passed RCS-specific rev. Returns +a hash of the files changed, a hash of the files deleted, and the +current rev. + +This hook is optional. + +### `rcs_get_current_rev()` + +Gets a RCS-specific rev, which can later be passed to `rcs_find_changes`. + +This hook is optional. + ### PageSpec plugins It's also possible to write plugins that add new functions to