Cook even better eggs

After you read EggCookingTutorial/BasicEggCooking and created your first egg, it's time to make it a bit better.

First we integrate our output to other Trac layout in form of ClearSilver template.

Adding template

To have a template we need a directory and of course the template itself. We will keep the same simple "Hello world!" text, but this time we will integrate our fine words into a Trac layout.

For that we need to create one additional directory:


In that directory create a new file helloworld.html:

<!DOCTYPE html
          PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
<html xmlns=""

  <xi:include href="layout.html" />

  <head><title>Hello world!</title></head>

    <div id="content">
      <h1>Hello world!</h1>


Now you have created the template for the plugin.

Tell Trac where the template is

Trac doesn't know where your template is, so you have to tell it. This is done by implementing the ITemplateProvider interface in

So you change few lines as following:

Line 4 is changed from:

from import INavigationContributor


from import INavigationContributor, ITemplateProvider

Line 9 is changed from:

    implements(INavigationContributor, IRequestHandler)


    implements(INavigationContributor, IRequestHandler, ITemplateProvider)

Starting from line 23 old process_request method is replaced by:

    def process_request(self, req):
        return 'helloworld.html', {}, None

And to end of file you need to tell where your template is located:

    # ITemplateProvider methods
    def get_templates_dirs(self):
        """Return a list of directories containing the templates"""

        from pkg_resources import resource_filename
        return [resource_filename(__name__, 'templates')]

And the complete version of then becomes:

# Helloworld plugin

from trac.core import *
from trac.util.html import html
from import INavigationContributor, ITemplateProvider
from trac.web.main import IRequestHandler

class HelloworldPlugin(Component):
    implements(INavigationContributor, IRequestHandler, ITemplateProvider)

    # INavigationContributor methods
    def get_active_navigation_item(self, _):
        return 'helloworld'

    def get_navigation_items(self, req):
        yield('mainnav', 'helloworld',
              html.a('Hello', href=req.href.helloworld()))

    # IRequestHandler methods
    def match_request(self, req):
        return req.path_info == '/helloworld'

    def process_request(self, _):
        return 'helloworld.html', {}, None

    # ITemplateProvider methods
    def get_templates_dirs(self):
        """ provide template dir """

        from pkg_resources import resource_filename
        return [resource_filename(__name__, 'templates')]

Copy template to egg

Finally you have to include the new template directory in an egg.

So change to be like:

from setuptools import setup

PACKAGE = 'TracHelloworld'
VERSION = '0.1'

      entry_points={'trac.plugins': '%s = helloworld' % PACKAGE},
      package_data={'helloworld': ['templates/*.html']},

Building and deploying

Building and deployment goes exactly the same as it did in the previous tutorial EggCookingTutorial/BasicEggCooking.

Now you should see a big "Hello world!" integrated into your Trac layout when you press that fancy button in the main navigation bar.


Now that you have added a basic template for your plugin let's add the final twist, putting some static content like a stylesheet and an image. Continue to EggCookingTutorial/AdvancedEggCooking2.

Last modified 5 years ago Last modified on Nov 3, 2016, 2:32:11 PM

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