add underlay files for listdirectives

As was noted, 'listdirectives' didn't include the underlay files that make
it really worthwhile.  I've just gone through all the plugin
documentation, modified it to remove installation information and renamed
the files to match the directives rather than the plugins.  This can now
serve as useful underlay.

I've only gone through plugins in the 'plugins' dir.  I did not go through
the 'contrib' dir.

1 files changed, 145 insertions, 0 deletions

diff --git a/underlays/basewiki/directive/meta.mdwn b/underlays/basewiki/directive/meta.mdwn
new file mode 100644
index 000000000..0b4b01ab8
--- /dev/null
+++ b/underlays/basewiki/directive/meta.mdwn
@@ -0,0 +1,145 @@
+The `meta` directive is supplied by the [[!iki plugins/meta]] plugin.
+
+This plugin 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
+also specifies some additional sub-parameters.
+
+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:
+
+* title
+
+  Overrides the title of the page, which is generally the same as the
+  page name.
+
+  Note that if the title is overridden, a "title_overridden" variable will
+  be set to a true value in the template; this can be used to format things
+  differently in this case.
+
+* license
+
+  Specifies a license for the page, for example, "GPL". Can contain
+  WikiLinks and arbitrary markup.
+
+* copyright
+
+  Specifies the copyright of the page, for example, "Copyright 2007 by
+  Joey Hess". Can contain WikiLinks and arbitrary markup.
+
+* author
+
+  Specifies the author of a page.
+
+* 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.
+
+* permalink
+
+  Specifies a permanent link to the page, if different than the page
+  generated by ikiwiki.
+
+* date
+
+  Specifies the creation date of the page. The date can be entered in
+  nearly any format, since it's parsed by [[!cpan TimeDate]].
+
+* stylesheet
+
+  Adds a stylesheet to a page. The stylesheet is treated as a wiki link to
+  a `.css` file in the wiki, so it cannot be used to add links to external
+  stylesheets. Example:
+
+	\[[!meta stylesheet=somestyle rel="alternate stylesheet"
+	title="somestyle"]]
+
+* openid
+
+  Adds html <link> tags to perform OpenID delegation to an external
+  OpenID server (for `openid` and `openid2`). 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).
+
+  This lets you use an ikiwiki page as your OpenID. Example:
+
+	\\[[!meta openid="http://joeyh.myopenid.com/"
+	server="http://www.myopenid.com/server"
+	xrds-location="http://www.myopenid.com/xrds?username=joeyh.myopenid.com""]]
+
+* link
+
+  Specifies a link to another page. This can be used as a way to make the
+  wiki treat one page as linking to another without displaying a user-visible
+  [[ikiwiki/WikiLink]]:
+
+       \[[!meta link=otherpage]]
+
+  It can also be used to insert a html <link> tag. For example:
+
+       \[[!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 insert unsafe content.
+
+* 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.
+
+  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 insert unsafe content.
+
+  For both cases, an anchor to jump to inside the destination page may also be
+  specified using the common `PAGE#ANCHOR` syntax.
+
+* robots
+
+  Causes the robots meta tag to be written:
+
+        \[[!meta robots="index, nofollow"]]
+
+  Valid values for the attribute are: "index", "noindex", "follow", and
+  "nofollow". Multiple comma-separated values are allowed, but obviously only
+  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.
+
+* 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
+  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
+  (see [[!iki tips/howto_avoid_flooding_aggregators]]).
+
+If the field is not one of the above predefined fields, the metadata will be
+written to the generated html page as a <meta> header. However, this
+won't be allowed if the [[!iki plugins/htmlscrubber]] plugin is enabled,
+since it can be used to insert unsafe content.