update for rename of recentchanges.mdwn to json.tl.ph.mdwn

[git.ikiwiki.info.git] / doc / plugins / write.mdwn

diff --git a/doc/plugins/write.mdwn b/doc/plugins/write.mdwn
index 33db3e707d8ad816bcc80a807ec8c8098fe72ec7..7480a61489f86076206500a357cc3342362a1b2a 100644 (file)
--- a/doc/plugins/write.mdwn
+++ b/doc/plugins/write.mdwn
@@ -31,20 +31,26 @@ is accomplished by calling various hooks provided by plugins.
 
 ### compiler
 
 
 ### 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
 
 
 ### cgi
 


@@ -53,33 +59,39 @@ 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,
-  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.
 
 
 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.
 * 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.
 
 
 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
 
 
 ## 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.
 
 The function is passed no values. It's ok for the function to call
 `error()` if something isn't configured right.
 

-### refresh
+### <a name="refresh">refresh</a>

 
        hook(type => "refresh", id => "foo", call => \&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.
 
 It's useful for plugins that need to create or modify a source page. The
 function is passed no values.
 

-### needsbuild
+### <a name="needsbuild">needsbuild</a>

 
        hook(type => "needsbuild", id => "foo", call => \&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.
 
 The second parameter passed to the function is a reference to an array of
 files that have been deleted.
 

-### scan
+### <a name="scan">scan</a>

 
        hook(type => "scan", id => "foo", call => \&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.
 
 The function is passed named parameters "page" and "content". Its return
 value is ignored.
 

-### filter
+### <a name="readtemplate">readtemplate</a>
+
+       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.
+
+### <a name="filter">filter</a>

 
        hook(type => "filter", id => "foo", call => \&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.
 
 can make arbitrary changes. The function is passed named parameters "page",
 "destpage", and "content". It should return the filtered content.
 

-### preprocess
+### <a name="preprocess">preprocess</a>

 
 Adding a preprocessor [[ikiwiki/directive]] is probably the most common use
 of a plugin.
 
 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.
 
 be linkified and passed through markdown (or whatever engine is used to
 htmlize the page) along with the rest of the page.
 

-### linkify
+### <a name="linkify">linkify</a>

 
        hook(type => "linkify", id => "foo", call => \&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`).
 
 for the links on the page and adds them to `%links` (typically by calling
 `add_link`).
 

-### htmlize
+### <a name="htmlize">htmlize</a>

 
        hook(type => "htmlize", id => "ext", call => \&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.
 
 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
+### <a name="indexhtml">indexhtml</a>

 
        hook(type => "indexhtml", id => "foo", call => \&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.
 
 The function is passed named parameters "page", "destpage", and "content".
 Its return value is ignored.
 

-### pagetemplate
+### <a name="pagetemplate">pagetemplate</a>

 
        hook(type => "pagetemplate", id => "foo", call => \&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.
 
 parameter, and can return a list of html fragments to add to the action
 bar.
 

-### sanitize
+### <a name="sanitize">sanitize</a>

 
        hook(type => "sanitize", id => "foo", call => \&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.
 
 The function is passed named parameters: "page", "destpage", and "content",
 and should return the sanitized content.
 

-### format
+### <a name="format">format</a>

 
        hook(type => "format", id => "foo", call => \&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.
 
 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`.
+
+### <a name="delete">delete</a>

 
        hook(type => "delete", id => "foo", call => \&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.
 
 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.
 
 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.)
+
+### <a name="changes">changes</a>
+
+       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);
 ### 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.
 
 Note that cgi hooks are called as early as possible, before any ikiwiki
 state is loaded, and with no session information.
 

-### auth
+### <a name="auth">auth</a>

 
        hook(type => "auth", id => "foo", call => \&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.
 
 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.
+
+### <a name="sessioncgi">sessioncgi</a>

 
        hook(type => "sessioncgi", id => "foo", call => \&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.
 
 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
+### <a name="canedit">canedit</a>

 
        hook(type => "canedit", id => "foo", call => \&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`.
 
 but is passed the named parameters `cgi` (a CGI object), `session` (a
 session object), `src`, `srcfile`, `dest` and `destfile`.
 

-### checkcontent
+### <a name="checkcontent">checkcontent</a>

        
        hook(type => "checkcontent", id => "foo", call => \&checkcontent);
 
        
        hook(type => "checkcontent", id => "foo", call => \&checkcontent);
 


@@ -466,7 +531,11 @@ 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.
 
 that can be run to perform whatever action is necessary to allow the user
 to post the content.
 

-### editcontent
+If the hook is ran on a comment, it will be put in the moderation queue if
+anything but `undef` is returned. The function or error message will not
+be ran or displayed.
+
+### <a name="editcontent">editcontent</a>

 
        hook(type => "editcontent", id => "foo", call => \&editcontent);
 
 
        hook(type => "editcontent", id => "foo", call => \&editcontent);
 


@@ -477,7 +546,7 @@ 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.
 
 
 It can modify the content as desired, and should return the content.
 

-### formbuilder
+### <a name="formbuilder">formbuilder</a>

 
        hook(type => "formbuilder_setup", id => "foo", call => \&formbuilder_setup);
        hook(type => "formbuilder", id => "foo", call => \&formbuilder);
 
        hook(type => "formbuilder_setup", id => "foo", call => \&formbuilder_setup);
        hook(type => "formbuilder", id => "foo", call => \&formbuilder);


@@ -580,6 +649,7 @@ describes the plugin as a whole. For example:
 * `description` is a short description of the option.
 * `link` is a link to further information about the option. This can either
   be a [[ikiwiki/WikiLink]], or an url.
 * `description` is a short description of the option.
 * `link` is a link to further information about the option. This can either
   be a [[ikiwiki/WikiLink]], or an url.

+* `htmldescription` is displayed instead of the description by websetup.

 * `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
 * `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


@@ -593,7 +663,7 @@ 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
   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
 
 
 ### genwrapper
 


@@ -644,7 +714,7 @@ 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
 
 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.
 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.


@@ -675,21 +745,28 @@ Ordinary [[WikiLinks|ikiwiki/WikiLink]] appear in `%links`, but not in
 
 ### `%pagesources`
 
 
 ### `%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.
 
 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{"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,
 
 ### `%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()`.
 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
 
 
 ## Library functions
 


@@ -982,18 +1059,22 @@ This is the standard gettext function, although slightly optimised.
 
 This is the standard ngettext function, although slightly optimised.
 
 
 This is the standard ngettext 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`.
 
 
 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 second parameter is `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 servers.
+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, an absolute url will be
-constructed instead of the default relative url.
+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($$)`
 
 
 ### `newpagefile($$)`
 


@@ -1105,9 +1186,7 @@ to version control; the subdir can be added if so.
 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
 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.
+to be committed when `rcs_commit` (or `rcs_commit_staged`) is called.

 
 #### `rcs_rename($$)`
 
 
 #### `rcs_rename($$)`
 


@@ -1147,11 +1226,13 @@ 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
 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($)`
 
 
 #### `rcs_getctime($)`
 


@@ -1215,6 +1296,20 @@ and an error message on failure.
 This hook and `rcs_preprevert` are optional, if not implemented, no revert
 web interface will be available.
 
 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
 ### PageSpec plugins
 
 It's also possible to write plugins that add new functions to