Level 12: use template engine extensions¶
jinja2 comes with a lot of extensions. In order not to be the blocker in the middle, extensions is allowed in moban file to initialize jinja2 engine with desired extensions. Two extensions, expression-statement and loop-controls are enabled by default.
The extensions syntax is:
extensions: template_type: - template.engine.specific.extension
extensions: jinja2: - jinja2.ext.i18n
Please also note that the following extensions are included by default: jinja2.ext.do, jinja2.ext.loopcontrols
Please go to docs/level-12-use-template-engine-extensions directory.
If you notice the file a.template, we are using a for loop control. This is because moban comes with two default extensions loop-controls and expression-statement.
Now, let us try to use the extension with. To do that, we have to enable the extension in the .moban.yml file following the above syntax. Now, the extension can be used in the jinja2 templates. One such example is shown in the b.template file.
For some extensions, you may need to define template environment parameters. In that case, you can take help of our user defined template types feature. Please read level-18 for more info. We have explained it using an example here.
Let us consider the example of jinja2_time. If you want to use datetime_format attribute, you need to specify the same using environmental parameters, i.e env.datetime_format = ‘%a, %d %b %Y %H:%M:%S’. In order to do this, you can specify datetime_format using environmental parameters, something like:
configuration: template_types: my_own_type: base_type: jinja2 file_extensions: - file_type_of_my_choice options: datetime_format: %a, %d %b %Y %H:%M:%S extensions: - jinja2_time.TimeExtension targets: - a.output: a.template.file_type_of_my_choice