= InterTrac Extension for TracLinks =

''(since [milestone:0.10])''

== Definitions ==

An InterTrac link is used for referring to a Trac object 
(Wiki page, changeset, ticket, ...) located in another
Trac environment.

== Link Syntax ==

{{{
<target_environment>:<TracLinks>
}}}

The link is composed by the target environment name, 
followed by a colon (e.g. `trac:`),
followed by a regular TracLinks, of any flavor.

That target environment name is either the real name of the 
environment, or an alias for it. 
The aliases are defined in `trac.ini` (see below).
The prefix is case insensitive.

For convenience, there's also an alternative short-hand form, 
where one can use an alias as an immediate prefix 
for the identifier of a ticket, changeset or report:
(e.g. `#T234`, `[T1508]`, `[trac 1508]`, ...)

== Examples ==

Besides the other environments run by the same server process
(called ''sibling'' environments), which are automatically detected,
it is necessary to setup a configuration for the InterTrac facility:
 * in order to refer to a remote Trac
 * for defining environment aliases

This is done quite simply in an `[intertrac]` section
within the `trac.ini` file.

Example configuration:
{{{
...
[intertrac]
## -- Example of setting up an alias:
t = trac

## -- Link to an external Trac:
trac.title = Edgewall's Trac for Trac
trac.url = http://projects.edgewall.com/trac

#trac.svn = http://repos.edgewall.com/projects/trac 
# Hint: .svn information could be used in the future to support svn:externals...
}}}

Now, given this configuration, one could create the following links:
 * to this InterTrac page:
   * `trac:wiki:InterTrac` ->
     [http://projects.edgewall.com/trac/wiki/InterTrac trac:wiki:InterTrac]
   * `t:wiki:InterTrac` ->
     [http://projects.edgewall.com/trac/wiki/InterTrac t:wiki:InterTrac]
   * Keys are case insensitive: `T:wiki:InterTrac` -> 
     [http://projects.edgewall.com/trac/wiki/InterTrac T:wiki:InterTrac]
 * to the ticket #234:
   * `trac:ticket:234` ->
     [http://projects.edgewall.com/trac/ticket/234 trac:ticket:234]
   * `trac:#234` ->
     [http://projects.edgewall.com/trac/ticket/234 trac:#234] ''(deprecated)''
   * `#T234` ->
     [http://projects.edgewall.com/trac/search?q=#234 #T234]
 * to the changeset [1912]:
   * `trac:changeset:1912` ->
     [http://projects.edgewall.com/trac/changeset/1912 trac:changeset:1912]
   * `[T1912]` ->
     [http://projects.edgewall.com/trac/changeset/1912 "[T1912]"]

Anything not given as explicit links (intertrac_prefix:module:id)
is interpreted by the remote Trac, relying on its quickjump
facility. ''(deprecated)''

It would be great, if these links also work in changeset comments, and source code comments. This would facilitate tickets, which touch multiple source code repositories, and patches which can be applied to multiple trees, which a dedicated trac instance each, as it should be possible by using source code control systems like bazaar-ng and mercurial.

----
See also: TracLinks, InterWiki