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[git.ikiwiki.info.git] / doc / ikiwiki / directive / meta.mdwn

diff --git a/doc/ikiwiki/directive/meta.mdwn b/doc/ikiwiki/directive/meta.mdwn
index b01dbfe7605694159191ed08b61ee456f9c15a79..777712f32eaaaad50be28a02ba635c669b9c0b1c 100644 (file)
--- a/doc/ikiwiki/directive/meta.mdwn
+++ b/doc/ikiwiki/directive/meta.mdwn
@@ -1,18 +1,19 @@
-The `meta` directive is supplied by the [[!iki plugins/meta]] plugin.
+The `meta` directive is supplied by the [[!iki plugins/meta desc=meta]] plugin.

 
 

-This plugin allows inserting arbitrary metadata into the source of a page.
+This directive allows inserting arbitrary metadata into the source of a page.

 Enter the metadata as follows:
 
        \[[!meta field="value"]]
        \[[!meta field="value" param="value" param="value"]]
 
 The first form sets a given field to a given value, while the second form
 Enter the metadata as follows:
 
        \[[!meta field="value"]]
        \[[!meta field="value" param="value" param="value"]]
 
 The first form sets a given field to a given value, while the second form

-also specifies some additional sub-parameters.
+also specifies some additional sub-parameters. You can have only one field
+per `meta` directive, use more directives if you want to specify more fields.

 
 The field values are treated as HTML entity-escaped text, so you can include
 a quote in the text by writing `"` and so on.
 
 
 The field values are treated as HTML entity-escaped text, so you can include
 a quote in the text by writing `"` and so on.
 

-Supported fields:
+## Supported fields

 
 * title
 
 
 * title
 


@@ -23,6 +24,13 @@ Supported fields:
   be set to a true value in the template; this can be used to format things
   differently in this case.
 
   be set to a true value in the template; this can be used to format things
   differently in this case.
 

+  An optional `sortas` parameter will be used preferentially when
+  [[ikiwiki/pagespec/sorting]] by `meta(title)`:
+
+       \[[!meta title="The Beatles" sortas="Beatles, The"]]
+
+       \[[!meta title="David Bowie" sortas="Bowie, David"]]
+

 * license
 
   Specifies a license for the page, for example, "GPL". Can contain
 * license
 
   Specifies a license for the page, for example, "GPL". Can contain


@@ -37,14 +45,28 @@ Supported fields:
 
   Specifies the author of a page.
 
 
   Specifies the author of a page.
 

+  An optional `sortas` parameter will be used preferentially when
+  [[ikiwiki/pagespec/sorting]] by `meta(author)`:
+
+       \[[!meta author="Joey Hess" sortas="Hess, Joey"]]
+

 * authorurl
 
   Specifies an url for the author of a page.
 
 * description
 
 * authorurl
 
   Specifies an url for the author of a page.
 
 * description
 

-  Specifies a "description" of the page. You could use this to provide
-  a summary, for example, to be picked up by the [[map]] plugin.
+  Specifies a short description for the page. This will be put in
+  the html header, and can also be displayed by eg, the [[map]] directive.
+
+* keywords
+
+  Specifies keywords summarizing the contents of the page. This
+  information will be put in the html header.  Only letters,
+  numbers, spaces and commas are allowed in this string; other
+  characters are stripped.  Note that the majority of search
+  engines, including Google, do not use information from the
+  keywords header.

 
 * permalink
 
 
 * permalink
 


@@ -53,8 +75,13 @@ Supported fields:
 
 * date
 
 
 * date
 

-  Specifies the creation date of the page. The date can be entered in
-  nearly any format, since it's parsed by [[!cpan TimeDate]].
+  Specifies the creation date of the page. This creates a 
+  `<meta name="date" content="...">` header in the HTML output, but also
+  modifies the internal `ctime` in the
+  [[!iki tips/inside_dot_ikiwiki desc="internal index"]].
+  The date can be entered in nearly any format, since it's parsed by
+  [[!cpan TimeDate]] but invalid dates yield an error in 3.20180321
+  or later.

 
 * stylesheet
 
 
 * stylesheet
 


@@ -64,19 +91,39 @@ Supported fields:
 
        \[[!meta stylesheet=somestyle rel="alternate stylesheet"
        title="somestyle"]]
 
        \[[!meta stylesheet=somestyle rel="alternate stylesheet"
        title="somestyle"]]

+  
+  However, this will be scrubbed away if the 
+  [[!iki plugins/htmlscrubber desc=htmlscrubber]] plugin is enabled,
+  since it can be used to insert unsafe content.
+
+* script
+
+  Adds a script to a page. The script is treated as a wiki link to
+  a `.js` file in the wiki, so it cannot be used to add links to external
+  scripts. The optional `defer` and `async` keywords can be used to set
+  the corresponding HTML4 and HTML5 script options. Example:
+
+       \[[!meta script=somescript defer async]]
+
+  The tag is subject to scrubbing as with the stylesheet and link fields.

 
 * openid
 
   Adds html &lt;link&gt; tags to perform OpenID delegation to an external
 
 * openid
 
   Adds html &lt;link&gt; tags to perform OpenID delegation to an external

-  OpenID server (for `openid` and `openid2`). An optional `xrds-location`
+  OpenID server. This lets you use an ikiwiki page as your OpenID.
+
+  By default this will delegate for both `openid` and `openid2`. To only
+  delegate for one, add a parameter such as `delegate=openid`.
+
+  An optional `xrds-location`

   parameter lets you specify the location of any [eXtensible Resource
   DescriptorS](http://www.windley.com/archives/2007/05/using_xrds.shtml).
 
   parameter lets you specify the location of any [eXtensible Resource
   DescriptorS](http://www.windley.com/archives/2007/05/using_xrds.shtml).
 

-  This lets you use an ikiwiki page as your OpenID. Example:
+  Example:

 
 

-       \\[[!meta openid="http://joeyh.myopenid.com/"
+       \[[!meta openid="http://joeyh.myopenid.com/"

        server="http://www.myopenid.com/server"
        server="http://www.myopenid.com/server"

-       xrds-location="http://www.myopenid.com/xrds?username=joeyh.myopenid.com""]]
+       xrds-location="http://www.myopenid.com/xrds?username=joeyh.myopenid.com"]]

 
 * link
 
 
 * link
 


@@ -91,24 +138,30 @@ Supported fields:
        \[[!meta link="http://joeyh.myopenid.com/" rel="openid.delegate"]]
 
   However, this latter syntax won't be allowed if the 
        \[[!meta link="http://joeyh.myopenid.com/" rel="openid.delegate"]]
 
   However, this latter syntax won't be allowed if the 

-  [[!iki plugins/htmlscrubber]] plugin is enabled, since it can be used to
+  [[!iki plugins/htmlscrubber desc=htmlscrubber]] plugin is enabled, since it can be used to

   insert unsafe content.
 
   insert unsafe content.
 

+* enclosure
+
+  Specifies a link to a file to be rendered as an "enclosure" in
+  RSS/Atom feeds (and a plain old link in HTML). Useful for
+  [[!iki podcast desc=podcasting]].
+

 * redir
 
   Causes the page to redirect to another page in the wiki.
 
        \[[!meta redir=otherpage]]
 
 * redir
 
   Causes the page to redirect to another page in the wiki.
 
        \[[!meta redir=otherpage]]
 

-  Optionally, a delay (in seconds) can be specified. The default is to
-  redirect without delay.
+  The default is to redirect without delay.
+  Optionally, a delay (in seconds) can be specified: "delay=10"

 
   It can also be used to redirect to an external url. For example:
 
        \[[!meta redir="http://example.com/"]]
 
   However, this latter syntax won't be allowed if the 
 
   It can also be used to redirect to an external url. For example:
 
        \[[!meta redir="http://example.com/"]]
 
   However, this latter syntax won't be allowed if the 

-  [[!iki plugins/htmlscrubber]] plugin is enabled, since it can be used to
+  [[!iki plugins/htmlscrubber desc=htmlscrubber]] plugin is enabled, since it can be used to

   insert unsafe content.
 
   For both cases, an anchor to jump to inside the destination page may also be
   insert unsafe content.
 
   For both cases, an anchor to jump to inside the destination page may also be


@@ -125,25 +178,57 @@ Supported fields:
   some combinations make sense. If there is no robots meta tag, "index,
   follow" is used as the default.
 
   some combinations make sense. If there is no robots meta tag, "index,
   follow" is used as the default.
 

-  The plugin escapes the value, but otherwise does not care about its
-  contents. In particular, it does not check the values against the set of
-  valid values but serves whatever you pass it.
+  The value is escaped, but its contents are not otherwise checked.

 
 * guid
 
 
 * guid
 

-  Specifies a globally unique ID for a page. This guid should be a URI
-  (in particular, it can be `urn:uuid:` followed by a UUID, as per
-  [[!rfc 4122]]), and it will be used to identify the page's entry in RSS
+  Specifies a globally unique ID for a page. This guid should be a URI,
+  and it will be used to identify the page's entry in RSS

   and Atom feeds. If not given, the default is to use the page's URL as its
   guid.
 
   This is mostly useful when a page has moved, to keep the guids for
   and Atom feeds. If not given, the default is to use the page's URL as its
   guid.
 
   This is mostly useful when a page has moved, to keep the guids for

-  pages unchanged and avoid_flooding_aggregators
+  pages unchanged and avoid flooding aggregators

   (see [[!iki tips/howto_avoid_flooding_aggregators]]).
 
   (see [[!iki tips/howto_avoid_flooding_aggregators]]).
 

+* updated
+
+  Specifies a fake modification time for a page, to be output into RSS and
+  Atom feeds. This is useful to avoid flooding aggregators that sort by
+  modification time, like Planet: for instance, when editing an old blog post
+  to add tags, you could set `updated` to be one second later than the original
+  value. The date/time can be given in any format that
+  [[!cpan TimeDate]] can understand, just like the `date` field and maps to the
+  `<meta name="updated" content="...">` HTML header and internal `mtime` field.
+
+* foaf
+
+  Adds a Friend of a Friend ([FOAF](http://wiki.foaf-project.org/w/Autodiscovery))
+  reference to a page.
+
+  Example:
+
+       \[[!meta foaf=foaf.rdf]]
+
+* name
+
+  Adds a HTML `<meta>` header with this `name` attribute. Its other attributes are
+  taken from the other parameters, so for example
+  `\[[!meta name="foo" content="bar" x-non-standard-attribute="baz"]]`
+  becomes `<meta name="foo" content="bar" x-non-standard-attribute="baz">`. This
+  won't be allowed if the [[!iki plugins/htmlscrubber desc=htmlscrubber]] plugin is enabled,
+  since it can be used to insert unsafe content.
+
+## Other fields
+

 If the field is not one of the above predefined fields, the metadata will be
 If the field is not one of the above predefined fields, the metadata will be

-written to the generated html page as a &lt;meta&gt; header. However, this
-won't be allowed if the [[!iki plugins/htmlscrubber]] plugin is enabled,
-since it can be used to insert unsafe content.
+written to the generated html page as a &lt;meta&gt; header. For example,
+`\[[!meta foo="bar"]]` becomes `<meta name="foo" content="bar">`. As
+with `name`, this won't be allowed if the [[!iki plugins/htmlscrubber
+desc=htmlscrubber]] plugin is enabled.
+
+This syntax cannot be used for meta headers with unusual names, in
+particular names containing `:` such as `flattr:id` and `twitter:card`.
+Please use `\[[!meta name="..." content="..."]]` for those headers.

 
 [[!meta robots="noindex, follow"]]
 
 [[!meta robots="noindex, follow"]]