X-Git-Url: http://git.vanrenterghem.biz/git.ikiwiki.info.git/blobdiff_plain/1dddec0ba9f66f082f4b8349916cdb6bdb5636e3..e75818572fff5256d16221a2b065b214d8cb9f5d:/doc/plugins/write.mdwn?ds=inline diff --git a/doc/plugins/write.mdwn b/doc/plugins/write.mdwn index 35f391f7f..2e11e6234 100644 --- a/doc/plugins/write.mdwn +++ b/doc/plugins/write.mdwn @@ -3,7 +3,7 @@ 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]]. -[[toc levels=2]] +[[!toc levels=2]] ## Types of plugins @@ -46,11 +46,13 @@ being edited. Plugins should, when imported, call `hook()` to hook into ikiwiki's processing. The function uses named parameters, and use varies depending on -the type of hook being registered -- see below. Note that a plugin can call -the function more than once to register multiple hooks. All calls to -`hook()` should be passed a "type" parameter, which gives the type of -hook, a "id" paramter, which should be a unique string for this plugin, and -a "call" parameter, which tells what function to call for the hook. +the type of hook being registered -- see below. A plugin can call +the function more than once to register multiple hooks. + +All calls to `hook()` should be passed a "type" parameter, which gives the +type of hook, a "id" parameter, which should be a unique string for this +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 @@ -99,6 +101,18 @@ 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 adding or removing files from it. +### scan + + hook(type => "scan", id => "foo", call => \&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. + +The function is passed named parameters "page" and "content". Its return +value is ignored. + ### filter hook(type => "filter", id => "foo", call => \&filter); @@ -109,34 +123,42 @@ make arbitrary changes. The function is passed named parameters "page", ### preprocess -Adding a [[ikiwiki/PreProcessorDirective]] is probably the most common use +Adding a preprocessor [[ikiwiki/directive]] is probably the most common use of a plugin. hook(type => "preprocess", id => "foo", call => \&preprocess); -Replace "foo" with the command name that will be used inside brackets for -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, while a "destpage" parameter gives the name of the page the -content is going to (different for inlined pages), and a "preview" -parameter is set to a true value if the page is being previewed. 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 +Replace "foo" with the command name that will be used for the preprocessor directive. -An optional "scan" parameter, if set to a true value, makes the hook be -called during the preliminary scan that ikiwiki makes of updated pages, -before begining to render pages. This parameter should be set to true 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 contets, you -can assume it's being run in scan mode.) +Each time the directive is processed, the referenced function (`preprocess` +in the example above) is called. Whatever the function returns goes onto +the page in place of the directive. Or, if the function aborts using +`error()`, the directive will be replaced with the error message. + +The function is passed named parameters. First come the parameters set +in the preprocessor directive. These are passed in the same order as +they're in the directive, and if the preprocessor directive contains a bare +parameter (example: `\[[!foo param]]`), that parameter will be passed with +an empty value. + +After the parameters from the preprocessor directive some additional ones +are passed: A "page" parameter gives the name of the page that embedded the +preprocessor directive, while a "destpage" parameter gives the name of the +page the content is going to (different for inlined pages), and a "preview" +parameter is set to a true value if the page is being previewed. + +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.) Note that if the [[htmlscrubber]] is enabled, html in -[[ikiwiki/PreProcessorDirective]] output is sanitised, which may limit what +preprocessor [[ikiwiki/directive]] output is sanitised, which may limit what your plugin can do. Also, the rest of the page content is not in html format at preprocessor time. Text output by a preprocessor directive will be linkified and passed through markdown (or whatever engine is used to @@ -154,23 +176,11 @@ 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`. -### scan - - hook(type => "scan", id => "foo", call => \&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. - -The function is passed named parameters "page" and "content". Its return -value is ignored. - ### htmlize hook(type => "htmlize", id => "ext", call => \&htmlize); -Runs on the raw source of a page and turns it into html. The id parameter +Runs on the source of a page and turns it into html. The id parameter specifies the filename extension that a file must have to be htmlized using this plugin. This is how you can add support for new and exciting markup languages to ikiwiki. @@ -178,6 +188,10 @@ languages to ikiwiki. The function is passed named parameters: "page" and "content" and should 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 +generating the page. + ### pagetemplate hook(type => "pagetemplate", id => "foo", call => \&pagetemplate); @@ -187,7 +201,7 @@ 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 templates. The function is passed named parameters. The "page" and "destpage" parameters are the same as for a preprocess hook. The "template" -parameter is a [[cpan HTML::Template]] object that is the template that +parameter is a [[!cpan HTML::Template]] object that is the template that will be used to generate the page. The function can manipulate that template object. @@ -214,13 +228,26 @@ 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. +### postscan + + hook(type => "postscan", id => "foo", call => \&postscan); + +This hook is called once the full page body is available (but before the +format hook). The most common use is to update search indexes. Added in +ikiwiki 2.54. + +The function is passed named parameters "page" and "content". Its return +value is ignored. + ### format hook(type => "format", id => "foo", call => \&format); The difference between format and sanitize is that sanitize only acts on the page body, while format can modify the entire html page including the -header and footer inserted by ikiwiki, the html document type, etc. +header and footer inserted by ikiwiki, the html document type, etc. (It +should not rely on always being passed the entire page, as it won't be +when the page is being previewed.) The function is passed named parameters: "page" and "content", and should return the formatted content. @@ -256,9 +283,9 @@ state is loaded, and with no session information. hook(type => "auth", id => "foo", call => \&auth); -This hook can be used to implement a different authentication method than -the standard web form. When a user needs to be authenticated, each registered -auth hook is called in turn, and passed a CGI object and a session object. +This hook can be used to implement an authentication method. When a user +needs to be authenticated, each registered auth hook is called in turn, and +passed a CGI object and a session object. If the hook is able to authenticate the user, it should set the session object's "name" parameter to the authenticated user's name. Note that @@ -310,7 +337,7 @@ It can modify the content as desired, and should return the content. hook(type => "formbuilder_setup", id => "foo", call => \&formbuilder_setup); hook(type => "formbuilder", id => "foo", call => \&formbuilder); -These hooks allow tapping into the parts of ikiwiki that use [[cpan +These hooks allow tapping into the parts of ikiwiki that use [[!cpan CGI::FormBuilder]] to generate web forms. These hooks are passed named parameters: `cgi`, `session`, `form`, and `buttons`. These are, respectively, the `CGI` object, the user's `CGI::Session`, a `CGI::FormBuilder`, and a @@ -329,15 +356,89 @@ called. It can be used to validate the form, but should not display it. hook(type => "savestate", id => "foo", call => \&savestate); -This hook is called wheneven ikiwiki normally saves its state, just before +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. +### displaytime + + hook(type => "displaytime", id => "foo", call => \&display); + +This hook can be registered to override the regular `displaytime` function. +Only the last displaytime hook will be used. + +### renamepage + + 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. + +### getsetup + + hook(type => "getsetup", id => "foo", call => \&getsetup); + +This hooks is not called during normal operation, but only when setting up +the wiki, or generating a setup file. Plugins can use this hook to add +configuration options. + +The hook is passed no parameters. It returns data about the configuration +options added by the plugin. It can also check if the plugin is usable, and +die if not, which will cause the plugin to not be offered in the configuration +interface. + +The data returned is a list of `%config` options, followed by a hash +describing the option. There can also be an item named "plugin", which +describes the plugin as a whole. For example: + + return + option_foo => { + type => "boolean", + description => "enable foo?", + advanced => 1, + safe => 1, + rebuild => 1, + }, + option_bar => { + type => "string", + example => "hello", + description => "option bar", + safe => 1, + rebuild => 0, + }, + plugin => { + description => "description of this plugin", + safe => 1, + rebuild => 1, + }, + +* `type` can be "boolean", "string", "integer", "pagespec", + or "internal" (used for values that are not user-visible). The type is + the type of the leaf values; the `%config` option may be an array or + hash of these. +* `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. +* `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 + configuration methods, such as the web interface. Anything that specifies + a command to run, a path on disk, or a regexp should be marked as unsafe. + If a plugin is marked as unsafe, that prevents it from being + enabled/disabled. +* `rebuild` should be true if changing the option (or enabling/disabling + the plugin) will require a wiki rebuild, false if no rebuild is needed, + and undef if a rebuild could be needed in some circumstances, but is not + strictly required. + ## Plugin interface To import the ikiwiki plugin interface: - use IkiWiki '1.00'; + use IkiWiki '2.00'; This will import several variables and functions into your plugin's namespace. These variables and functions are the ones most plugins need, @@ -352,14 +453,14 @@ it's not exported, the wise choice is to not use it. A plugin can access the wiki's configuration via the `%config` hash. The best way to understand the contents of the hash is to look at -[[ikiwiki.setup]], which sets the hash content to configure the wiki. +your ikiwiki setup file, which sets the hash content to configure the wiki. ### %pagestate The `%pagestate` hash can be used by plugins to save state that they will need next time ikiwiki is run. The hash holds per-page state, so to set a value, -use `%pagestate{$page}{$id}{$key}=$value`, and to retrieve the value, -use `%pagestate{$page}{$id}{$key}`. +use `$pagestate{$page}{$id}{$key}=$value`, and to retrieve the value, +use `$pagestate{$page}{$id}{$key}`. The `$value` can be anything that perl's Storable module is capable of serializing. `$key` can be any string you like, but `$id` must be the same @@ -372,6 +473,15 @@ When pages are deleted, ikiwiki automatically deletes their pagestate too. Note that page state does not persist across wiki rebuilds, only across wiki updates. +### %wikistate + +The `%wikistate` hash can be used by a plugin to store persistant state +that is not bound to any one page. To set a value, use +`$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 @@ -408,16 +518,17 @@ Aborts with an error message. If the second parameter is passed, it is a function that is called after the error message is printed, to do any final cleanup. -Note that while any plugin can use this for a fatal error, plugins should -try to avoid dying on bad input, as that will halt the entire wiki build -and make the wiki unusable. So for example, if a -[[ikiwiki/PreProcessorDirective]] is passed bad parameters, it's better to -return an error message, which can appear on the wiki page, rather than -calling error(). +If called inside a preprocess hook, error() does not abort the entire +wiki build, but instead replaces the preprocessor [[ikiwiki/directive]] with +a version containing the error message. + +In other hooks, error() is a fatal error, so use with care. Try to avoid +dying on bad input when building a page, as that will halt +the entire wiki build and make the wiki unusable. #### `template($;@)` -Creates and returns a [[cpan HTML::Template]] object. The first parameter +Creates and returns a [[!cpan HTML::Template]] object. The first parameter is the name of the file in the template directory. The optional remaining parameters are passed to `HTML::Template->new`. @@ -426,6 +537,9 @@ parameters are passed to `HTML::Template->new`. Passed a page name, returns the base name that will be used for a the html page created from it. (Ie, it appends ".html".) +Use this when constructing the filename of a html file. Use `urlto` when +generating a link to a page. + #### `add_depends($$)` Makes the specified page depend on the specified [[ikiwiki/PageSpec]]. @@ -528,6 +642,23 @@ a type that ikiwiki knowns how to htmlize. Otherwise, returns undef. Given the name of a source file, returns the name of the wiki page that corresponds to that file. +#### `pagetitle($)` + +Give the name of a wiki page, returns a version suitable to be displayed as +the page's title. This is accomplished by de-escaping escaped characters in +the page name. "_" is replaced with a space, and '__NN__' is replaced by +the UTF character with code NN. + +#### `titlepage($)` + +This performs the inverse of `pagetitle`, ie, it converts a page title into +a wiki page name. + +#### `linkpage($)` + +This converts text that could have been entered by the user as a +[[WikiLink]] into a wiki page name. + #### `srcfile($;$)` Given the name of a source file in the wiki, searches for the file in @@ -557,18 +688,29 @@ time. This is the standard gettext function, although slightly optimised. -#### `urlto($$)` +#### `urlto($$;$)` Construct a relative url to the first parameter from the page named by the second. The first parameter can be either a page name, or some other destination file, as registered by `will_render`. +If the third parameter is passed and is true, an absolute url will be +constructed instead of the default relative url. + +#### `newpagefile($$)` + +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($$)` Passed a page and an extension, returns the filename that page will be rendered to. -## Internal use pages +## Miscellaneous + +### Internal use pages Sometimes it's useful to put pages in the wiki without the overhead of having them be rendered to individual html files. Such internal use pages @@ -581,19 +723,111 @@ either on them with extreme caution), and are not matched by regular PageSpecs glob patterns, but instead only by a special `internal()` [[ikiwiki/PageSpec]]. -## RCS plugins +### RCS plugins + +ikiwiki's support for [[revision_control_systems|rcs]] is also done via +plugins. See [[RCS_details|rcs/details]] for some more info. + +RCS plugins must register a number of hooks. Each hook has type 'rcs', +and the 'id' field is set to the name of the hook. For example: + + hook(type => "rcs", id => "rcs_update", call => \&rcs_update); + hook(type => "rcs", id => "rcs_prepedit", call => \&rcs_prepedit); -ikiwiki's support for [[revision_control_systems|rcs]] also uses pluggable -perl modules. These are in the `IkiWiki::RCS` namespace, for example -`IkiWiki::RCS::svn`. +#### `rcs_update()` -Each RCS plugin must support all the `IkiWiki::rcs_*` functions. -See IkiWiki::RCS::Stub for the full list of functions. It's ok if -`rcs_getctime` does nothing except for throwing an error. +Updates the working directory with any remote changes. -See [[RCS_details|rcs/details]] for some more info. +#### `rcs_prepedit($)` -## PageSpec plugins +Is passed a file to prepare to edit. It can generate and return an arbitrary +token, that will be passed into `rcs_commit` when committing. For example, +it might return the current revision ID of the file, and use that +information later when merging changes. + +#### `rcs_commit($$$;$$)` + +Passed a file, message, token (from `rcs_prepedit`), user, and ip address. +Should try to commit the file. Returns `undef` on *success* and a version +of the page with the rcs's conflict markers on failure. + +#### `rcs_commit_staged($$$)` + +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 +`rcs_rename`. + +#### `rcs_add($)` + +Adds the passed file to the archive. The filename is relative to the root +of the srcdir. + +Note that this should not commit the new file, it should only +prepare for it to be committed when rcs_commit (or `rcs_commit_staged`) is +called. Note that the file may be in a new subdir that is not yet in +to version control; the subdir can be added if so. + +#### `rcs_remove($)` + +Remove a file. The filename is relative to the root of the srcdir. + +Note that this should not commit the removal, it should only prepare for it +to be committed when `rcs_commit` (or `rcs_commit_staged`) is called. Note +that the new file may be in a new subdir that is not yet in version +control; the subdir can be added if so. + +#### `rcs_rename($$)` + +Rename a file. The filenames are relative to the root of the srcdir. + +Note that this should not commit the rename, it should only +prepare it for when `rcs_commit` (or `rcs_commit_staged`) is called. +The new filename may be in a new subdir, that is not yet added to +version control. If so, the subdir will exist already, and should +be added to revision control. + +#### `rcs_recentchanges($)` + +Examine the RCS history and generate a list of recent changes. +The parameter is how many changes to return. + +The data structure returned for each change is: + + { + rev => # the RCSs id for this commit + user => # name of user who made the change, + committype => # either "web" or the name of the rcs, + when => # time when the change was made, + message => [ + { line => "commit message line 1" }, + { line => "commit message line 2" }, + # etc, + ], + pages => [ + { + page => # name of page changed, + diffurl => # optional url to a diff of changes + }, + # repeat for each page changed in this commit, + ], + } + +#### `rcs_diff($)` + +The parameter is the rev from `rcs_recentchanges`. +Should return a list of lines of the diff (including \n) in list +context, and the whole diff in scalar context. + +#### `rcs_getctime($)` + +This is used to get the page creation time for a file from the RCS, by looking +it up in the history. + +It's ok if this is not implemented, and throws an error. + +### PageSpec plugins It's also possible to write plugins that add new functions to [[PageSpecs|ikiwiki/PageSpec]]. Such a plugin should add a function to the @@ -603,3 +837,98 @@ 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. + +### Setup plugins + +The ikiwiki setup file is loaded using a pluggable mechanism. If you look +at the top of a setup file, it starts with 'use IkiWiki::Setup::Standard', +and the rest of the file is passed to that module's import method. + +It's possible to write other modules in the `IkiWiki::Setup::` namespace that +can be used to configure ikiwiki in different ways. These modules should, +when imported, populate `$IkiWiki::Setup::raw_setup` with a reference +to a hash containing all the config items. They should also implement a +`gendump` function. + +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 `