How to modify trac to create own custom Link format (TracLinks)

In the open-source trac issue tracking software, when you write text in the wiki or ticket comments, you can link to a ticket using #1234 or you can link to a code changeset using r1234. This is the documentation: http://trac.edgewall.org/wiki/TracLinks

I would like to define my own link format. 3 examples of what I'd like to do:

1. I'd like a1234 to link to a acunote ticket (which complements trac but is external to our trac installation).
2. I'开发者_StackOverflowd like ge2a1b3caadd0986e3e3d316c01965a2495329b87 to link to a github commit (i.e. https://github.com/peritor/webistrano/commit/e2a1b3caadd0986e3e3d316c01965a2495329b87).
3. I'd like CComponent to link to the Yii documentation (i.e. http://www.yiiframework.com/doc/api/1.1/CComponent)

Does anyone know how I can do this using trac v0.12. Should I use a Macro? a plugin? a Genshi template? It strikes me as something that could be quite simple if you have the know how?

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If you want this exact syntax, you have no other choice than to create a plugin and have a Component that implements the IWikiSyntaxProvider interface.

If you can live with a slightly different syntax, for example [a:1234] for the acunote ticket, [g:e2a1b3caadd0986e3e3d316c01965a2495329b87] for the github changeset, and [y:CComponent] for the Yii documentation, then you could add the following entries to the InterMapTxt page of your Trac installation:

a    http://my.acunote.site/ticket/$1                  # Acunote ticket $1
g    https://github.com/peritor/webistrano/commit/$1   # Changeset $1 on Github
y    http://www.yiiframework.com/doc/api/1.1/$1        # Yii documentation for $1

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Remy is correct in that your syntax is potentially making this more difficult. The standard Trac syntax for links is resource_type:link_specifier. If you are able to use that syntax instead, then it's fairly straightforward to use Inter-Wiki links to accomplish what you want.

If that's not an option, you can do what you describe with a custom-built plugin. It's not as difficult as it might sound, you can use the source from an existing plugin as an example. I have done this several times before, all you really need is a regular expression that represents the syntax you wish to use and one that represents the format of the resulting link, as well as about one page of Python code.

Update: For an example of how to do this via a Trac plugin, there is sample code and a description in the official Trac documentation.