Support for InterWiki links

(since [milestone:0.10])

Definition

An InterWiki link can be used for referring to a Wiki page located in another Wiki system, and by extension, to any object located in any other Web application, provided a simple URL mapping can be done.

Link Syntax

<target_wiki>(:<identifier>)+

The link is composed by the targeted Wiki (or system) name, followed by a column (e.g. MeatBall:), followed by a page specification in the target. Note that, as for InterTrac prefixes, InterWiki prefixes are case insensitive.

The target Wiki URL is looked up in a the InterMapTxt wiki page, modelled after ​MeatBall:InterMapTxt.

In addition to traditional InterWiki links, where the target is simply appended to the URL, Trac supports parametric InterWiki URLs: identifiers $1, $2, ... in the URL will be replaced by corresponding arguments. The argument list is formed by splitting the page identifier using the ":" separator.

Examples

If the following is an excerpt of the InterMapTxt page:

= InterMapTxt =
== This is the place for defining InterWiki prefixes ==

Currently active prefixes: [[InterWiki]]

This page is modelled after the MeatBall:InterMapTxt page.
In addition, an optional comment is allowed after the mapping.
----
{{{
PEP     http://www.python.org/peps/pep-$1.html                                       # Python Enhancement Proposal $1 
TracML  http://thread.gmane.org/gmane.comp.version-control.subversion.trac.general/$1  # Message $1 in Trac Mailing List

...
MeatBall http://www.usemod.com/cgi-bin/mb.pl?
MetaWiki http://sunir.org/apps/meta.pl?
MetaWikiPedia http://meta.wikipedia.org/wiki/
MoinMoin http://moinmoin.wikiwikiweb.de/
...
}}}

Then,

• MoinMoin:InterWikiMap should be rendered as ​MoinMoin:InterWikiMap and the title for that link would be "InterWikiMap in MoinMoin"
• TracML:4346 should be rendered as ​TracML:4346 and the title for that link would be "Message 4346 in Trac Mailing List"