X-Git-Url: http://git.vanrenterghem.biz/git.ikiwiki.info.git/blobdiff_plain/4a7558539cd9d0f1ed5c586c29811035f7c14d14..512d860c169d776885922b7eaff0bcb2b722f12a:/doc/plugins/write.mdwn?ds=sidebyside diff --git a/doc/plugins/write.mdwn b/doc/plugins/write.mdwn index d94216e17..f0f79ebc7 100644 --- a/doc/plugins/write.mdwn +++ b/doc/plugins/write.mdwn @@ -1,4 +1,4 @@ -Ikiwiki's plugin interface allows all kinds of useful [[plugins]] to be +lkiwiki'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]]. @@ -31,7 +31,7 @@ is accomplished by calling various hooks provided by plugins. ### compiler -As a compiler, starts by calling the `refresh` hook. Then it checks +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. @@ -39,7 +39,7 @@ 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`, `postscan`, +hooks: `filter`, `preprocess`, `linkify`, `htmlize`, `indexhtml`, `pagetemplate`, `sanitize`, `format`. After all necessary pages are built, it calls the `change` hook. Finally, @@ -48,10 +48,11 @@ page had previously produced are removed. ### cgi -The flow between hooks when ikiwiki is run as a cgi is best illistrated by +The flow between hooks when ikiwiki is run as a cgi is best illustrated by an example. -* *Alice browses to a page and clicks Edit.* +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, @@ -61,7 +62,9 @@ an example. Alice is not signed in. * The [[signinedit]] plugin then launches the signin process. A signin page is built by calling the `formbuilder_setup` hook. -* *Alice signs in with her openid.* + +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 @@ -70,7 +73,9 @@ an example. a page. * Now all the `canedit` hooks are happy. The [[editpage]] plugin calls `formbuilder_setup` to display the page editing form. -* *Alice saves her change to the page.* + +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 @@ -172,10 +177,15 @@ function is passed no values. hook(type => "needsbuild", id => "foo", call => \&needsbuild); -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 files that will be rebuilt, and can modify the array, either -adding or removing files from it. +This allows a plugin to observe or even manipulate the list of files that +need to be built when the wiki is refreshed. + +As its first parameter, the function is passed a reference to an array of +files that will be built. It should return an array reference that is a +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 @@ -193,8 +203,8 @@ value is ignored. hook(type => "filter", id => "foo", call => \&filter); -Runs on the raw source of a page, before anything else touches it, and can -make arbitrary changes. The function is passed named parameters "page", +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 @@ -277,22 +287,22 @@ 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. -### postscan +### indexhtml - hook(type => "postscan", id => "foo", call => \&postscan); + hook(type => "indexhtml", id => "foo", call => \&indexhtml); This hook is called once the page has been converted to html (but before the generated html is put in a template). 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. +The function is passed named parameters "page", "destpage", and "content". +Its return value is ignored. ### pagetemplate hook(type => "pagetemplate", id => "foo", call => \&pagetemplate); -[[Templates|wikitemplates]] are filled out for many different things in +[[Templates]] 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 templates. The function is passed named parameters. The "page" and @@ -308,11 +318,20 @@ a new custom parameter to the template. hook(type => "templatefile", id => "foo", call => \&templatefile); -This hook allows plugins to change the [[template|wikitemplates]] that is +This hook allows plugins to change the [[template|templates]] that is used for a page in the wiki. The hook is passed a "page" parameter, and -should return the name of the template file to use, or undef if it doesn't -want to change the default ("page.tmpl"). Template files are looked for in -/usr/share/ikiwiki/templates by default. +should return the name of the template file to use (relative to the +template directory), or undef if it doesn't want to change the default +("page.tmpl"). + +### pageactions + + hook(type => "pageactions", id => "foo", call => \&pageactions); + +This hook allows plugins to add arbitrary actions to the action bar on a +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 @@ -531,7 +550,7 @@ 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 + return plugin => { description => "description of this plugin", safe => 1, @@ -581,7 +600,17 @@ describes the plugin as a whole. For example: hook(type => "genwrapper", id => "foo", call => \&genwrapper); This hook is used to inject C code (which it returns) into the `main` -function of the ikiwiki wrapper when it is being generated. +function of the ikiwiki wrapper when it is being generated. + +The code runs before anything else -- in particular it runs before +the suid wrapper has sanitized its environment. + +### disable + + hook(type => "disable", id => "foo", call => \&disable); + +This hook is only run when a previously enabled plugin gets disabled +during ikiwiki setup. Plugins can use this to perform cleanups. ## Exported variables @@ -628,6 +657,22 @@ reference. Do not modify this hash directly; call `add_link()`. $links{"foo"} = ["bar", "baz"]; +### `%typedlinks` + +The `%typedlinks` hash records links of specific types. Do not modify this +hash directly; call `add_link()`. The keys are page names, and the values +are hash references. In each page's hash reference, the keys are link types +defined by plugins, and the values are hash references with link targets +as keys, and 1 as a dummy value, something like this: + + $typedlinks{"foo"} = { + tag => { short_word => 1, metasyntactic_variable => 1 }, + next_page => { bar => 1 }, + }; + +Ordinary [[WikiLinks|ikiwiki/WikiLink]] appear in `%links`, but not in +`%typedlinks`. + ### `%pagesources` The `%pagesources` has can be used to look up the source filename @@ -680,10 +725,31 @@ the entire wiki build and make the wiki unusable. ### `template($;@)` -Creates and returns a [[!cpan HTML::Template]] object. The first parameter -is the name of the file in the template directory. The optional remaining +Creates and returns a [[!cpan HTML::Template]] object. (In a list context, +returns the parameters needed to construct the obhect.) + +The first parameter is the name of the template file. The optional remaining parameters are passed to `HTML::Template->new`. +Normally, the template file is first looked for in the templates/ subdirectory +of the srcdir. Failing that, it is looked for in the templatedir. + +Wiki pages can be used as templates. This should be done only for templates +which it is safe to let wiki users edit. Enable it by passing a filename +with no ".tmpl" extension. Template pages are normally looked for in +the templates/ directory. If the page name starts with "/", a page +elsewhere in the wiki can be used. + +If the template is not found, or contains a syntax error, an error is thrown. + +### `template_depends($$;@)` + +Use this instead of `template()` if the content of a template is being +included into a page. This causes the page to depend on the template, +so it will be updated if the template is modified. + +Like `template()`, except the second parameter is the page. + ### `htmlpage($)` Passed a page name, returns the base name that will be used for a the html @@ -713,7 +779,10 @@ Additional named parameters can be specified: * `filter` is a reference to a function, that is called and passed a page, and returns true if the page should be filtered out of the list. * `sort` specifies a sort order for the list. See - [[ikiwiki/PageSpec/sorting]] for the avilable sort methods. + [[ikiwiki/PageSpec/sorting]] for the avilable sort methods. Note that + if a sort method is specified that depends on the + page content (such as 'meta(foo)'), the deptype needs to be set to + a content dependency. * `reverse` if true, sorts in reverse. * `num` if nonzero, specifies the maximum number of matching pages that will be returned. @@ -731,7 +800,7 @@ By default, dependencies are full content dependencies, meaning that the page will be updated whenever anything matching the PageSpec is modified. This can be overridden by passing a `deptype` value as the third parameter. -#### `pagespec_match($$;@)` +### `pagespec_match($$;@)` Passed a page name, and [[ikiwiki/PageSpec]], returns a true value if the [[ikiwiki/PageSpec]] matches the page. @@ -761,7 +830,7 @@ dependency type from one or more of these keywords: If multiple types are specified, they are combined. -#### `bestlink($$)` +### `bestlink($$)` Given a page and the text of a link on the page, determine which existing page that link best points to. Prefers pages under a @@ -769,7 +838,7 @@ subdirectory with the same name as the source page, failing that goes down the directory tree to the base looking for matching pages, as described in [[ikiwiki/SubPage/LinkingRules]]. -#### `htmllink($$$;@)` +### `htmllink($$$;@)` Many plugins need to generate html links and add them to a page. This is done by using the `htmllink` function. The usual way to call @@ -895,25 +964,40 @@ search for files. If the directory name is not absolute, ikiwiki will assume it is in the parent directory of the configured underlaydir. -### `displaytime($;$)` +### `displaytime($;$$)` Given a time, formats it for display. The optional second parameter is a strftime format to use to format the time. +If the third parameter is true, this is the publication time of a page. +(Ie, set the html5 pubdate attribute.) + ### `gettext` This is the standard gettext function, although slightly optimised. -### `urlto($$;$)` +### `ngettext` + +This is the standard ngettext function, although slightly optimised. + +### `urlto($;$$)` 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. +Provide a second parameter whenever possible, since this leads to better +behaviour for the [[plugins/po]] plugin and `file:///` URLs. + +If the second parameter is not specified (or `undef`), the URL will be +valid from any page on the wiki, or from the CGI; if possible it'll +be a path starting with `/`, but an absolute URL will be used if +the wiki and the CGI are on different domains. + +If the third parameter is passed and is true, the url will be a fully +absolute url. This is useful when generating an url to publish elsewhere. ### `newpagefile($$)` @@ -930,11 +1014,31 @@ Optionally, a third parameter can be passed, to specify the preferred filename of the page. For example, `targetpage("foo", "rss", "feed")` will yield something like `foo/feed.rss`. -### `add_link($$)` +### `add_link($$;$)` This adds a link to `%links`, ensuring that duplicate links are not added. Pass it the page that contains the link, and the link text. +An optional third parameter sets the link type. If not specified, +it is an ordinary [[ikiwiki/WikiLink]]. + +### `add_autofile($$$)` + +Sometimes you may want to add a file to the `srcdir` as a result of content +of other pages. For example, [[plugins/tag]] pages can be automatically +created as needed. This function can be used to do that. + +The three parameters are the filename to create (relative to the `srcdir`), +the name of the plugin, and a callback function. The callback will be +called if it is appropriate to automatically add the file, and should then +take care of creating it, and doing anything else it needs to (such as +checking it into revision control). Note that the callback may not always +be called. For example, if an automatically added file is deleted by the +user, ikiwiki will avoid re-adding it again. + +This function needs to be called during the scan hook, or earlier in the +build process, in order to add the file early enough for it to be built. + ## Miscellaneous ### Internal use pages @@ -972,16 +1076,20 @@ 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($$$;$$)` +#### `rcs_commit(@)` + +Passed named parameters: `file`, `message`, `token` (from `rcs_prepedit`), +and `session` (optional). -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($$$)` +#### `rcs_commit_staged(@)` + +Passed named parameters: `message`, and `session` (optional). -Passed a message, user, and ip address. Should commit all staged changes. -Returns undef on success, and an error message on failure. +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`. @@ -1024,7 +1132,9 @@ The data structure returned for each change is: { rev => # the RCSs id for this commit - user => # name of user who made the change, + user => # user who made the change (may be an openid), + nickname => # short name for user (optional; not an openid), + committype => # either "web" or the name of the rcs, when => # time when the change was made, message => [ @@ -1041,19 +1151,30 @@ The data structure returned for each change is: ], } -#### `rcs_diff($)` +#### `rcs_diff($;$)` + +The first parameter is the rev from `rcs_recentchanges`. +The optional second parameter is how many lines to return (default: all). -The parameter is the rev from `rcs_recentchanges`. Should return a list of lines of the diff (including \n) in list -context, and the whole diff in scalar context. +context, and a string containing the whole diff in scalar context. #### `rcs_getctime($)` This is used to get the page creation time for a file from the RCS, by looking it up in the history. +If the RCS cannot determine a ctime for the file, return 0. + +#### `rcs_getmtime($)` + +This is used to get the page modification time for a file from the RCS, by +looking it up in the history. + It's ok if this is not implemented, and throws an error. +If the RCS cannot determine a mtime for the file, return 0. + #### `rcs_receive()` This is called when ikiwiki is running as a pre-receive hook (or @@ -1063,9 +1184,9 @@ sense to implement for all RCSs. It should examine the incoming changes, and do any sanity checks that are appropriate for the RCS to limit changes to safe file adds, -removes, and changes. If something bad is found, it should exit -nonzero, to abort the push. Otherwise, it should return a list of -files that were changed, in the form: +removes, and changes. If something bad is found, it should die, to abort +the push. Otherwise, it should return a list of files that were changed, +in the form: { file => # name of file that was changed @@ -1078,6 +1199,28 @@ files that were changed, in the form: The list will then be checked to make sure that each change is one that is allowed to be made via the web interface. +#### `rcs_preprevert($)` + +This is called by the revert web interface. It is passed a RCS-specific +change ID, and should determine what the effects would be of reverting +that change, and return the same data structure as `rcs_receive`. + +Like `rcs_receive`, it should do whatever sanity checks are appropriate +for the RCS to limit changes to safe changes, and die if a change would +be unsafe to revert. + +#### `rcs_revert($)` + +This is called by the revert web interface. It is passed a named +parameter rev that is the RCS-specific change ID to revert. + +It should try to revert the specified rev, and leave the reversion staged +so `rcs_commit_staged` will complete it. It should return undef on _success_ +and an error message on failure. + +This hook and `rcs_preprevert` are optional, if not implemented, no revert +web interface will be available. + ### PageSpec plugins It's also possible to write plugins that add new functions to @@ -1101,6 +1244,24 @@ For example, "backlink(foo)" is influenced by the contents of page foo; they match; "created_before(foo)" is influenced by the metadata of foo; while "glob(*)" is not influenced by the contents of any page. +### Sorting plugins + +Similarly, it's possible to write plugins that add new functions as +[[ikiwiki/pagespec/sorting]] methods. To achieve this, add a function to +the IkiWiki::SortSpec package named `cmp_foo`, which will be used when sorting +by `foo` or `foo(...)` is requested. + +The names of pages to be compared are in the global variables `$a` and `$b` +in the IkiWiki::SortSpec package. The function should return the same thing +as Perl's `cmp` and `<=>` operators: negative if `$a` is less than `$b`, +positive if `$a` is greater, or zero if they are considered equal. It may +also raise an error using `error`, for instance if it needs a parameter but +one isn't provided. + +The function will also be passed one or more parameters. The first is +`undef` if invoked as `foo`, or the parameter `"bar"` if invoked as `foo(bar)`; +it may also be passed additional, named parameters. + ### Setup plugins The ikiwiki setup file is loaded using a pluggable mechanism. If you look